(57) Abstract: Because a thin blade is disposed in a space that has a thickness in the
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`optical aXial direction, which contains a coil and a magnet, when the blade is
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`driven the blade tends to become unstable, making smooth operation of the thin
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`blade difficult. A blade driving device 1 comprises: a driving member 2, a frame
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`3 that is provided with a driving frame chamber 38 that contains the driving
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`member 2, a blade supporting unit 4 that has an opening 4A and that structures a
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`blade chamber 48 that is separate from the driving frame chamber 38, and a
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`blade member 5 that is contained in the blade chamber 48, and that is moved by
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`the driving member 2 to advance into the opening 4A.
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`Detailed Explanation of the Invention
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`Field of Technology
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`[0001] The present invention relates to a blade driving device for driving a blade.
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`Prior Art
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`[0002] Blade driving devices are used to change the state of an opening by driving one
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`or more blade members that advance into the opening, and are used in a variety
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`up optical units, such as camera units, for irises, shutters, iris-shutters, filters, and
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`the like. As conventional blade driving devices those of the electromagnetically-
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`driven type, that use magnets and coils as driving sources, are well known
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`(referencing Patent Document 1, below).
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`Prior Art References
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`Patent Documents
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`[0003]
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`[Patent Document 1] Japanese Unexamined Patent Application Publication 2001-
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`281724
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`Summary of the Invention
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`Problem Solved by the Present Invention
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`[0004]
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`In the conventional blade driving device, described above, the blade and the
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`driving source, such as a coil, are disposed on a base plate that has an opening,
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`where the coil or the magnet as the driving source is disposed within a space that
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`is shared with the blade, without a partition.
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`

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`[0005] With such a conventional blade driving device, because a thin blade is disposed
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`in a space that has thickness, in the axial direction, that contains a coil and/or a
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`magnetic, when the blade is driven the blade tends to become unstable, and thus
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`there is a problem in that this makes smooth operation of the thin blade diff1cult.
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`Moreover, because there is a tendency for dust that is produced through the
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`action of the driving source to adhere thereto, there is a problem in that the
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`durability of the blade that moves is not adequately high.
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`[0006]
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`In the present invention, the handling of such problems is the problem to be
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`solved. That is, the object of the present invention is to provide a structure
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`wherein the blade is not affected by the action of the driving source, and that not
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`only causes the action of the blade to be smooth, but also improves the durability
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`of the blade.
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`Means for Solving the Problem
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`[0007]
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`In order to solve such a problem, the lens driving device according to the present
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`invention is provided with the following structures:
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`A blade driving device comprising: a driving member, a frame that is provided
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`with a driving frame chamber that contains the driving member, a blade
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`supporting unit that has an opening and that structures a blade chamber that is
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`separate from the driving frame chamber, and a blade member that is contained
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`in the blade chamber, and that is moved by the driving member to advance into
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`the opening.
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`Brief Descriptions of the Drawings
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`[0008] FIG. 1 is an exploded perspective diagram depicting a blade driving device
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`according to an embodiment according to the present invention.
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`FIG. 2 is an explanatory diagram depicting the movement of the blade member
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`(wherein (a) shows the fully opened state and (b) shows the closed state).
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`FIG. 3 is an external view (plan view) of a blade driving device according to an
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`embodiment according to the present invention.
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`FIG. 4 is a perspective diagram of the A-A cross-section in FIG. 3.
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`

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`FIG. 5 is an explanatory diagram depicting the state wherein the blade driving
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`device is assembled onto the lens frame (wherein (a) is a front view and (b) is a
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`plan view).
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`FIG. 6 is a cross-sectional view along the section B-B in FIG. 5 (b).
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`FIG. 7 is an exploded perspective diagram depicting another structural example
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`of the blade driving device.
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`FIG. 8 is a plan view depicting another structural example of the blade driving
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`device.
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`FIG. 9 is an exploded perspective diagram depicting another structural example
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`of the blade driving device.
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`FIG. 10 is an explanatory diagram depicting a camera equipped with the blade
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`driving device.
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`FIG. 11 is an explanatory diagram depicting a mobile electronic device equipped
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`with the blade driving device (camera).
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`Forms for Carrying out the Present Invention
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`[0009]
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`A blade driving device according to an embodiment according to the present
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`invention is equipped with the structure described above, where a driving frame
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`chamber that contains the driving member and a blade chamber that contains the
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`blade member are separated spatially. Through this, the blade supporting unit
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`that structures the blade chamber is supported so as to enable smooth movement
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`of a blade member that is in a thin shape. Moreover, because the blade member
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`is contained within a blade chamber that is separate from the driving frame
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`chamber, the dust from the action of the driving member is blocked, enabling an
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`increase in durability of the blade member.
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`[0010]
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`Embodiments according to the present invention will be explained below in
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`reference to the drawings. In the descriptions below, identical reference symbols
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`in the different drawings below indicate positions with identical functions, and
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`redundant explanations in the various drawings are omitted as appropriate. In the
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`figure, the arrow in the Z direction indicates the optical axial direction (the
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`thickness direction of the blade driving device, the arrow X indicates the
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`

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`direction of movement of the blade member; and the direction of the arrow Y
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`indicates a direction that is perpendicular to the X and Yl[WWSl] directions.
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`[0011]
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`As illustrated in FIG. 1, a blade driving device 1 in an embodiment according to
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`the present invention comprises a driving member 2, a frame 3, a blade
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`supporting unit 4, and blade members 5 (SK and 5Y). The frame 3 is structured
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`from a base frame 10 and a cover frame 11 that covers the base frame 10, to form
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`a driving frame chamber 38 that contains the driving member 2 therein. The
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`driving member 2 is supported movably on a supporting face 10A of the base
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`frame 10, so as to move the blade members 5 (SK and 5Y) through moving on a
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`plane.
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`[0012]
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`A magnet 20 and a coil 21, which are the driving source, are attached to the
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`driving member 2 and the frame 3. In the example in FIG. 1, the magnet 20 is
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`attached to the driving member 2 and the coil 21 is attached to the frame 3 (the
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`cover frame 11), where power is applied to the coil 21 through a wiring board (a
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`flexible substrate) 22, to cause the driving member 2 to undergo reciprocating
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`motion in the X direction in the figure. The driving member 2 is supported
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`movably in a supporting groove 10B of a supporting face 10A on a bearing 23.
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`Moreover, a Hall element (detecting member) 30, for detecting movement of the
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`driving member 2 or the blade member 5 (5X, 5Y) is disposed on the wiring
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`board 22 at a position corresponding to the magnet 20. Note that the driving
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`source is disposed horizontally, or essentially horizontally, in relation to the
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`direction in which a protruding part 4P, described below, is inserted into a slit 6S
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`(hereinafter termed the "insertion direction").
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`[0013]
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`The blade members 5 (5X, 5Y) are connected to the driving member 2, either
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`directly or through connecting members 7. In the example depicted in FIG. 1, the
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`connecting member 7 is borne within the frame 3. In the connecting member 7, a
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`bearing portion 7A, in the center, is borne on a shaft lOP of the base frame 10,
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`where connecting portions 7B, on both ends thereof, pass through elongated
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`holes 4B of the blade supporting unit 4, and are respectively connected in
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`connecting holes 5B of the blade members SK and 5Y, where, near the center,
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`the connecting portion 7C passes through an elongated hole 4C of the blade
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`

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`supporting unit 4, and is connected to the driving member 2. Through this, when
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`the driving member 2 undergoes reciprocating motion linearly along the X
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`direction, the connecting member 7 rotates around the shaft lOP, so that the
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`blade members 5X and 5Y, which are connected to the connecting portions 7B,
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`move in mutually opposing directions along the X direction.
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`[0014]
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`The blade member 5 (5X, 5Y) is supported on a blade supporting unit 4. The
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`blade supporting unit 4 is structured from a pair of supporting plates 12 and 13,
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`made from thin metal plates, or the like. The pair of blade supporting plates 12
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`and 13, which are thin members, hold the blade member 5 (5X, 5Y)
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`therebetween, and stepped portions 4T, at the periphery edges thereof, are
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`attached together, to form a blade chamber 48 that contains the blade member 5
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`(5X, 5Y) in the interior thereof. The blade supporting unit 4 has an opening 4A
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`around the optical axis, along the thickness direction (the Z direction in the
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`drawings) of the frame 3. The blade member 5 (5X, 5Y) is moved, by the driving
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`member 2, to advance into the opening 4A. In the example in the figure, the
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`blade member 5 (5X, 5Y) has an opening 5A, where the degree of overlap of the
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`opening 5A in the opening 4A is adjusted variably by the movement in the X
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`direction in the figure.
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`[0015]
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`Explaining, in greater detail, the example in the figure, a protrusion lOQ of the
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`base frame 10 fits into a hole 4Q of the blade supporting unit 4, to engage the
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`blade supporting unit 4 with the base frame 10, and, additionally, the protrusion
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`lOQ is inserted into a guide hole (elongated hole) 5Q of the blade member 5 (5X,
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`5Y) that is supported on the blade supporting unit 4, to guide the movement of
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`the blade member 5 (5X, 5Y). Moreover, within the frame 3 (the base frame 10),
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`a magnetic material 24 is disposed to hold the blade member 5 in an initial
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`position, and to attract the driving frame member 2l[wws2] in the optical axial
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`direction relative to the base frame 10.
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`[0016]
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`FIG. 2 depicts the movement of the blade member 5 (5X, 5Y). In the example in
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`the figure, an example is shown wherein the blade driving device 1 has the
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`function of an iris device for variably adjusting the brightness of light that passes
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`through the opening 4A.
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`(a) depicts the fully open state of the opening 4A
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`

`

`through the rotation of the connecting member 7 by the movement of the driving
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`member 2 (not shown), described above, and (b) depicts the state wherein the
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`opening area is closed through overlapping of the opening 5A within the opening
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`4A. While, in the example in the figure, an example of an iris device is depicted,
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`the blade driving device 1 may instead function as a shutter device for blocking
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`the light that passes through the opening 4A by fully closing the opening 4A by
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`the blade members 5 (5X and 5Y) overlapping, or may function as a filter device
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`through attaching a filter, for limiting the wavelengths or brightness of the light,
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`to end portions of the openings 5A of the blade members 5 (SK and 5Y).
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`[0017]
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`Note that in the example depicted in FIG. 2, in the connecting portion between
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`the driving member 2, not shown, and the connecting member 7, one end is
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`secured to the driving member 2, and the other end is provided with an elastic
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`member (a leaf spring) 14 that presses the connecting portion 7C of the
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`connecting member 7. Through connecting the driving member 2 and the
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`connecting member 7 through the elastic member 14 in this way, the movement
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`of the driving member 2 can be transmitted to the connecting member 7 without
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`rattling, making it possible to increase the accuracy of movement of the blade
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`members 5 (SK and 5Y), enabling an increase in the accuracy of brightness
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`adjustment.
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`[0018]
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`FIG. 3 depicts an external view of the blade driving device 1, and FIG. 4 depicts
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`a perspective diagram along the cross-section A-A in FIG. 3. In the blade driving
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`device 1, the frame 3 structures a driving frame chamber 38 that contains the
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`driving member 2, and the blade supporting unit 4 structures a blade chamber 48
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`that is separate from the driving frame chamber 38. Moreover, the blade
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`supporting unit 4, which contains the blade member 5, protrudes to the outside
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`along the direction of movement of the driving member 2 (the X direction in the
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`figure) from part of the thickness of the frame 3, between the base frame 10 and
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`the cover frame 11, and the opening 4A of the blade supporting unit 4 is located
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`outside of the frame 3. The blade supporting unit 4 is a member of a thin shape,
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`structured so as to be thinner than the thickness of the frame 3.
`
`

`

`[0019] The outer peripheral edge of the frame 3 has a recessed portion 3A at the
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`position wherein the blade supporting unit 4 protrudes. Through this, the
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`protruding part 4P and opening 4A of the blade supporting unit 4 are located
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`within a space that is outside of the frame 3, because of the recessed portion 3A.
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`Moreover, a stepped portion 3B for supporting the content, by the frame 3, is
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`provided in the recessed portion 3A of the frame 3. Given this, a gap S is formed
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`between the protruding part 4P of the blade supporting unit 4 that protrudes in
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`the recessed portion 3A, and the outer periphery of the recessed portion 3A of
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`the frame 3.
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`[0020] Given the blade driving device 1, described above, first the blade supporting unit
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`4 that structures the blade chamber 48 can support the thin blade member 5 so as
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`to enable smooth movement thereof. Moreover, because the blade member 5 is
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`contained within the blade chamber 48, which is separate from the driving frame
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`chamber 38, the dust due to the action of the driving member 2 is blocked,
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`enabling the durability of the blade member 5 to be increased.
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`[0021] Moreover, the thin blade supporting unit 4 protrudes the outside, from a portion
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`of the frame 3, in the thickness direction thereof, and an opening 4A is provided
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`in this protruding part 4P, and thus the protruding part 4P enables the opening
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`4A to be disposed on the optical aXis of the optical components, through
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`insertion of the protruding part 4P from the outside in respect to the optical
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`components, such as the lens frame. Through this, this can prevent the optical
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`components and the blade driving device 1 from being disposed stacked in the
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`optical aXial direction, enabling the combination of the optical components and
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`the blade driving device 1 to be structured more thinly.
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`[0022] Moreover, a gap S is provided between the protruding part 4P of the blade
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`supporting unit 4 and the outer periphery of the recessed portion 3A of the frame
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`3, and the protruding part 4P protrudes in a cantilevered state, thus enabling
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`insertion of the protruding part 4P from the outside of a portion of the integrated
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`optical components, enabling the opening 4A to be disposed on the optical aXis
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`of the optical components. This makes it possible to install the blade driving
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`device 1 into the assembled optical components after completion of adjustments,
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`

`

`and the like, of the optical components, enabling a simplification in the
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`adjustments of the optical components that are to be assembled together with the
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`blade driving device 1. Note that, conversely, the adjustments to the optical
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`components may be carried out after assembly together with the blade driving
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`device 1.
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`[0023]
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`Note that while the example in the figure depicted in an example wherein the
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`driving member 2 is a VCM (Voice Coil Motor) as a driving mechanism for
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`causing reciprocating motion on a plane, the driving method is not limited
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`particularly thereto, but rather any of a variety of driving methods may be used.
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`[0024]
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`FIG. 5 and FIG. 6 depicts the state wherein the blade driving device 1 is
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`assembled together with a lens frame 6. The lens frame 6 is provided with a slit
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`68 on a side face, where the protruding part 4P of the blade supporting unit 4 is
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`inserted into the slit 68 of the lens frame 6, contained within the recessed portion
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`3A of the frame 3. The lens frame 6 supports, as a single unit, lenses L1, L2, and
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`L3 that are disposed to the front and the rear of the blade supporting unit 4. Here
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`the protruding part 4P of the blade supporting unit 4 is inserted into a space
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`between the lens L2 and the lens L3, where the lenses L1 and L2 are disposed to
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`the front side (the object side as parent of the blade supporting unit 4, and the
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`lens L3 is disposed to the rear side (the imaging element side) of the blade
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`supporting unit 4. A stepped portion 6A is provided on a side frame in the lens
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`frame 6, where the stepped portion 6A rests on the stepped portion 3B of the
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`frame 3, to assemble the blade driving device 1 with good seating in relation to
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`the lens frame 6. However, in another embodiment, the stepped portion 3B and
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`the stepped portion 6A need not necessarily be provided. In such a case,
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`assembly to the frame 3 is possible regardless of the front/back orientation of the
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`lens frame 6.
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`[0025] Such a structural example enables the lens frame 6, which supports the lenses L1,
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`L2, and L3, integrally, to have the adjustments between lenses, and the like, be
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`carried out with the lens frame 6 independently, and the blade supporting unit 4
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`is inserted into the slit 68, to assemble the blade driving device 1 together with
`
`the lens frame 6, after these adjustments. Moreover, the blade supporting unit 4
`
`

`

`is inserted onto the optical axis of the lens frame 6 from the side of the lens
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`frame 6, enabling the assembly to be thin in the optical axial direction, rather
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`than the lens frame 6 and the blade driving device 1 being stacked in the optical
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`axial direction. At this time, because the optical axial direction thickness of the
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`frame 3 is thin when compared to the optical axial direction of thickness of the
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`lens frame 6, the blade driving device 1 can be assembled together within the
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`thickness of the lens frame 6, enabling assembly with good spatial efficiency
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`along the optical axial direction. Note that, although omitted from the drawings,
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`the slit 68 is formed passing all the way through the interior of the lens frame 6.
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`Because of this, at the time of assembly, the protruding part 4P may be inserted
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`from either side of the lens frame 6 (slit 68). However, in another embodiment,
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`the slit 68 need not pass all the way through.
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`[0026]
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`FIG. 7 and FIG. 8 depicts another structural example of a blade driving device 1.
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`In the blade driving device 1 depicted in FIG. 1, the magnet 20 and the coil 21
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`that are the driving source were provided extending along the direction of
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`protrusion of the blade supporting unit 4 within the frame 3 (the X direction in
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`the figure). In contrast, in the example depicted in FIG. 7, the magnet 20 and the
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`coil 21 that are the driving source extend along the direction that is perpendicular
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`(the Y direction in the figure) relative to the direction of protrusion of the blade
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`supporting unit 4 within the frame 3 (the X direction in the figure). In the
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`example in FIG. 7 as well, the driving member 2 moves in the X direction in the
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`figures, so driving is the same as in the example depicted in FIG. 1.
`
`[0027]
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`For the direction in which the driving source extends, this direction may be
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`selected as appropriate in order to provide the desired driving force in the
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`direction of movement of the driving member 2 (the X direction in the figures).
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`For example, the example in FIG. 1 and the example in FIG. 7 may be combined
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`with the driving source (the magnet 20 and the coil 21) provided extending along
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`the direction of protrusion of the blade supporting unit 4 in the frame 3 (the X
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`direction in the figures), and provided extending in the direction that is
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`perpendicular to the direction in which the blade supporting unit 4 protrudes (the
`
`X direction in the figures). For example, a portion of the driving source may be
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`

`

`provided extending along the direction of protrusion of the blade supporting unit
`
`4 (the X direction in the figures), and provided in a direction that is
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`perpendicular to the direction of protrusion (the X direction in the figure), with
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`the driving source in a L shape.
`
`[0028]
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`Note that the driving source is disposed perpendicularly, or essentially
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`perpendicularly, in relation to the direction of insertion. Moreover, in another
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`embodiment, the example in FIG. 1 and the example in FIG. 7 may be combined,
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`provided with both a driving source that is provided along the direction of
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`protrusion of the blade supporting unit 4 (the X direction in the figures) and a
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`driving source that is provided in a direction that is perpendicular to the direction
`
`of protrusion of the blade supporting unit 4 (the X direction in the figures).
`
`[0029]
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`Moreover, in the example depicted in FIG. 7 and FIG. 8, the frame 3 is provided
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`with an attaching protrusion 3P. This makes it possible to assemble the blade
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`driving device 1 easily to a side face, or the like, of the lens frame through the
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`provision of a fitting hole, in the side face of the lens frame, or the like, into
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`which the attaching protrusion 3P is inserted.
`
`[0030]
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`FIG. 9 depicts another structural example of a blade driving device 1. In this
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`example, in the blade member 5, a plurality of blade members 5X and 5Y are
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`provided overlapping, where one of the blade members 5X is secured directly to
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`the driving member 2 and the other blade member 5Y is connected through a
`
`connecting member 7 to the driving member 2. Specifically, the securing portion
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`2A of the driving member 2 is secured directly to a secured portion 5C of the
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`blade member 5X through a hole 4Ql of the blade supporting unit 4. Moreover,
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`the driving member 2 is connected to a connecting portion 7C of the connecting
`
`member 7. When the driving member 2 moves in the X direction in the figures,
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`the blade member 5X moves integrally therewith, and, the connecting member 7
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`is rotated around the shaft lOP. The blade member 5Y that is connected through
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`the connecting hole SE to the connecting portion 7B at the end portion of the
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`connecting member 7 moves in the opposite direction from that of the blade
`
`member 5X.
`
`

`

`[0031]
`
`In the example depicted in FIG. 9, the one blade member 5X moves integrally
`
`with the driving member 2, and thus in the mechanism wherein the pair of blade
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`members SK and 5Y are moved in mutually opposing directions by a single
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`driving member 2, there will be less of a rattling effect than there would be in a
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`case wherein both of the blade members SK and 5Y were connected through
`
`connecting members 7, enabling an improvement in the movement accuracy of
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`the blade members SK and 5Y. Through this, this enables, for example, a
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`brightness adjustment with better accuracy. Note that the driving member 2 may
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`be divided into left and right sides, and the blade member SK and the blade
`
`member 5Y may be secured directly to the respective driving members 2. In this
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`case, the connecting member 7 would be unnecessary, enabling a brightness
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`adjustment with even higher accuracy.
`
`[0032]
`
`FIG. 10 depicts a camera 100 as an optical unit that is provided with the blade
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`driving device 1. The blade driving device 1 may be assembled together with the
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`lens frame 6 as described above, and may be mounted in a case 100A wherein an
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`imaging element 101 is mounted, to structure a camera 100. Moreover, various
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`types of optical units can be produced through assembling the blade driving
`
`device 1 together with other optical components. Such a camera 100 or optical
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`unit can be made thinner, enabling a reduction in the thickness of the space for
`
`installation along the optical axial direction. Moreover, because the blade driving
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`device 1 can be assembled and integrated after the adjustments to the lens frame
`
`6, and the like, have been completed, this enables simple and highly accurate
`
`adjustments, and enables simple mounting through integration of the blade
`
`driving device 1.
`
`[0033]
`
`FIG. 11 depicts a mobile electronic device (mobile information terminal) 200
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`that is equipped with the camera 100 described above. The mobile electronic
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`device 200, such as a smart phone, or the like, has severe limitations on the
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`thickness of the units packaged in the interior thereof, but the camera 100, as
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`described above, enables a reduction in thickness through assembly with the
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`blade driving device 1 contained within the thickness of the lens frame 6, thus
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`enabling packaging with excellent spatial efficiency in a mobile electronic device
`
`

`

`200 that targets high portability and design characteristics. Note that the
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`members disposed within the frame 3 in these examples have the layout positions
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`and shapes designed so as to be assembled sequentially from one side of the base
`
`frame 10.
`
`[0034] While embodiments according to the present invention were described in detail
`
`above, referencing the drawings, the specific structures thereof are not limited to
`
`these embodiments, but rather design variations within a range that does not
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`deviate from the spirit and intent of the present invention are also included in the
`
`present invention. In particular, while in the embodiments set forth above, the
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`frame 3 of the blade driving device 1 was structured from a member that was
`
`separate from the blade supporting unit 4, instead the frame 3 may be structured
`
`integrally with the blade supporting unit 4, and the driving frame chamber 3S
`
`within the frame 3 and the blade chamber 4S within the blade supporting unit 4
`
`may be separated through a partition. Moreover, insofar as there are no
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`particular contradictions or problems in purposes or structures, or the like, the
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`technologies of the various embodiments described above may be used together
`
`in combination.
`
`Explanation of Codes
`
`[0035]
`
`1: Blade Driving Device
`
`2: Driving Member
`
`2A: Securing Member
`
`3: Frame
`
`3A: Recessed Portion
`
`3B: Stepped Portion
`
`3 S: Driving Frame Chamber
`
`3P: Attaching Protrusion
`
`4: Blade Supporting Unit
`
`4A: Opening
`
`4B, 4C: Elongated Holes
`
`4P: Protruding Part
`
`4S: Blade Chamber
`
`

`

`4T: Stepped Portion
`
`4Q, 4Q1: Holes
`
`5 (5X, 5Y): Blade Member
`
`5A: Opening
`
`5B: Connecting Hole
`
`5C: Secured Portion
`
`5Q: Guide Hole
`
`6: Lens Frame
`
`6A: Stepped Portion
`
`6S: Slit
`
`7: Connecting Member
`
`7A: Bearing Portion
`
`7B, 7C: Connecting Portions
`
`10: Base Frame
`
`10A: Supporting Face
`
`10B: Supporting Groove
`
`10P: Shaft
`
`10Q: Protrusion
`
`1 1: Cover Frame
`
`12, 13: Blade Supporting Plates
`
`14: Elastic Member (Leaf Spring)
`
`20: Magnet (Driving Source)
`
`21: Coil (Driving Source)
`
`22: Wiring Board (Flexible Substrate)
`
`23: Bearing
`
`24: Magnetic Material
`
`30: Hall Element (Detecting Member)
`
`100: Camera
`
`100A: Case
`
`101: Imaging Element
`
`S: Gap
`
`

`

`200: Mobile Electronic Device (Mobile Information Terminal)
`
`