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`(19) Japan Patent Office (JP)
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`(12) Publication of Utility Model Application (U)
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`(11) Publication Number of Utility Model Application H1-92004
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`(43) Date of Publication of Application June 16, 1989
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`(51) Int. Cl.4 ID Symbol
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`Interoffice Reference Number
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`F 21 Q 1/00
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`C-6941-3K
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`Request for Examination not made ( pages in total)
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`----------------------------------------------------------
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`(54) Title of Invention Vehicle Lamp
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`(21) Utility Model Application S62-186048
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`(22) Application Date December 8, 1987
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`(72) Inventor Hiroshige SHINKAI
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`c/o Koito Manufacturing Co., Ltd., Shizuoka Plant
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`500, Kitawaki, Shimizu-shi, Shizuoka-ken
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`(72) Inventor
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`Jiro Miyakawa
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`c/o Koito Manufacturing Co., Ltd., Shizuoka Plant
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`500, Kitawaki, Shimizu-shi, Shizuoka-ken
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`(71) Applicant Koito Manufacturing Co., Ltd.
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`8-3, Takanawa 4-chome, Minato-ku, Tokyo
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`(74) Agent
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`Patent Attorney Hideto YAGI
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`BMW Exhibit 1007
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`Page 1 of 43
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`SPECIFICATION
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`1. Title of the Invention
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`Vehicle Lamp
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`2. Scope of Claim for Utility Model Registration
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`(1) A vehicle lamp in which a light guiding space of a substantially
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`L-shaped sectional configuration and consisting of a front space situated in
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`front of a light source and a side space by the side thereof is formed by a lamp
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`body and a front surface lens, wherein a stippling light guiding plate is arranged
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`10
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`in the side space.
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`3. Detailed Description of the Invention
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`[Industrial Field of Application]
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`The present invention relates to a vehicle lamp in which a light guiding
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`space of a substantially L-shaped configuration and consisting of a front space
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`in front of a bulb and a side space by the side of the bulb is formed between a
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`lamp body and a front surface lens, and, in particular, to a vehicle lamp
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`structure in which light is guided to a predetermined side space region that the
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`light from the bulb does not reach sufficiently by a light guiding plate having a
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`light reflection portion.
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`[Prior Art]
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`Conventionally, various vehicle lamps of this type have been realized;
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`Fig. 7 shows an example of such vehicle lamps.
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`Fig. 7 is a main portion sectional view of the vehicle lamp as disclosed
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`in JP S58-49522 Y2; this vehicle lamp has a light guiding space 3 of a
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`substantially L-shaped sectional configuration formed by a lamp body 1 and an
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`outer lens 2; a light guiding plate 4 is arranged beside this light guiding space 3,
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`and a saw-teeth-like prism steps 5 are formed on the inner side of this light
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`guiding plate 4; light from a bulb 6 enters the light guiding plate 4 as indicated
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`by the arrows, and is guided to a light guiding plate distal end portion 4b after
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`repeating reflection in the light guiding plate 4; and, at the same time, the light is
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`reflected by the prism steps 5 to be applied to the outer lens side, thus making
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`the visibility at the side portion of the outer lens satisfactory.
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`[Problems that the Invention is to Solve]
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`However, in the construction of the above-described vehicle lamp,
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`when the light guiding plate 4 is long, the light guided is attenuated, and, the
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`closer to the forward end portion of the light guiding plate, the more reduced is
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`the light quantity, which means sufficient light does not reach the forward end
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`portion of the side space, resulting in a rather insufficient illumination at the
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`lamp side portion, and, in particular, in a rather poor visibility at the side portion
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`of the lamp.
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`Further, it is necessary to adjust the light quantity according to the
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`depth, interval, angle, etc. of the prism steps, which means the light quantity
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`adjustment is very bothersome.
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`Further, the light guiding plate is formed in a mold; and, the
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`configuration of the prism steps is regulated by the releasing direction of the
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`forming mold; the prism steps cannot be made high at the curved portion of the
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`light guiding plate, so that the illumination of the lamp side portion is insufficient,
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`resulting in deterioration in visibility. In particular, when the kind of vehicle
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`lamp differs, the configuration of the prism steps differs, so that it is necessary
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`to adjust the mold each time the kind of lamp is changed, which means the light
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`quantity adjustment is rather difficult.
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`[Means for Solving the Problems]
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`The present invention has been made with a view toward solving the
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`above-problems in the prior-art technique; it is an object of the present
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`invention to provide a vehicle lamp which can sufficiently illuminate down to the
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`side portion, and which allows easy light quantity adjustment.
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`According to the present invention, there is provided a vehicle lamp in
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`which a light guiding space of a substantially L-shaped sectional configuration
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`and consisting of a front space situated in front of a light source and a side
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`space by the side thereof is formed by a lamp body and a front surface lens,
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`wherein a stippling light guiding plate is arranged in the side space; even when
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`the light is attenuated in the light guiding plate, reflection light is dense if the
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`stippling is dense, making it possible to obtain a sufficient quantity of light, so
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`that it is possible to guide a sufficient quantity of light via the stippling light
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`guiding plate to the side space which is difficult for the light from the bulb to
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`reach, whereby it is possible to uniformly illuminate the entire lamp.
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`[Embodiments]
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`Next, embodiments of the present invention will be described with
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`reference to the drawings.
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`Fig. 1 is a main portion sectional view of a direct illumination type
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`vehicle lamp according to a first embodiment of the present invention.
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`In Fig. 1, a light guiding space 12 is defined by an outer lens 10, which
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`is a front surface lens, and a lamp body 11. This light guiding space 12 is
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`composed of a front space 12a situated in front of a bulb 13 and a side space
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`12b situated by the side of the bulb 13, and extends in a substantially L-shaped
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`sectional configuration. Numeral 14 indicates a stippling light guiding plate
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`guiding the light from the bulb 13 to the side space 12b; one end portion 14a
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`thereof faces the bulb 13, and the entire light guiding plate extends along the
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`side space 12b, and is fixedly mounted to the lamp body 11 by an appropriate
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`means such as bonding, fusion-bonding, or screws, which are not shown.
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`This stippling light guiding plate 14 is formed of a transparent synthetic resin in
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`a substantially L-shaped sectional configuration, and is curved in a curvature
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`substantially equivalent to that of the outer lens portion curve corresponding to
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`the light guiding space 12 extending from the side portion of the outer lens 10,
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`that is, one end portion of the front space 12a, to the side space 12b, with its
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`thickness dimension being diminished as it extends toward the forward end.
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`Further, the back surface of the stippling light guiding plate 14, that is,
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`the lamp body 11 side surface thereof, has a stippling reflection portion 15
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`configured to reflect the light guided into the light guiding plate to the outer lens
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`15
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`side. This stippling reflection portion 15 is formed by a large number of
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`stipples 16, with the stipples 16 becoming denser as the light guiding plate
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`extends toward the forward end portion 14b. Generally speaking, the nearer
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`to the forward end portion of the side space 12b, the more difficult it is for the
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`light from the bulb 13 to reach, i.e., it is darker there; further, the light introduced
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`into the light guiding plate is also gradually attenuated, with the light quantity
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`thereof decreasing. Thus, the nearer to the forward end side of the side space
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`12b, the higher the stipple density so that the reflection light at the stippling
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`reflection portion 15 may be largely secured, whereby it is possible to attain a
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`uniform illumination throughout the entire lamp. Thus, due to the stippling
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`reflection portion 15, much light is guided to the side portion 10a of the outer
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`lens 10, and the quantity of light in the entire lamp is made uniform; at the same
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`time, the visibility at the side portion of the lamp, which has in particular been a
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`problem to be solved, is satisfactory.
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`Further, white painting processing 17 is performed on the front surface
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`portion of the lamp body 11 facing the stippling light guiding plate 14, and light
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`absorption at the body surface is suppressed as far as possible, whereby a
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`further improvement is achieved in terms of visibility.
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`Next, the operation of the above embodiment will be described.
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`Of the light from the bulb 13, the portion of the light which has advanced
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`to the side of the stippling light guiding plate 14, one end of which faces the
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`interior of the front space 12a, enters the interior from this one end portion 14a
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`of the light guiding plate, and repeats reflection between the front and back
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`surfaces of the stippling light guiding surface 14 to be guided to the forward end
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`portion 14b of the light guiding plate; and, at the same time, a portion of the light
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`guided into the light guiding plate is reflected at the stippled surface, and is
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`transmitted through the light guiding plate, the side space 12b, and the outer
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`lens 10 before being applied to the front surface of the outer lens 10. The
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`nearer to the forward end portion of the light guiding plate 14, the higher the
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`stippling density, and the density of reflection light at the stippling reflection
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`portion 15 is so much the higher; also, the nearer to the forward end side of the
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`side space 12b, which is difficult for the direct illumination light from the bulb 13
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`to reach, the quantity of reflection light is so much the larger, with the result that
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`the quantity of light in the light guiding space 12 is uniform, whereby it is
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`possible to attain a uniform illumination throughout the entire lamp. As a result,
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`it is possible to achieve an improvement in terms of the visibility at the outer
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`lens side portion 10a, which has in particular been a problem to be solved.
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`Fig. 2 shows an example of the mold for molding the stippling light
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`guiding plate 14; Fig. 2(a) is a longitudinal sectional view of the same, and Figs.
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`2(b) and 2(c) are explanatory views illustrating stippling density adjustment
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`methods.
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`In these drawings, the stippling light guiding plate 14 is molded by an
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`upper mold 42 and a lower mold 44. The upper and lower molds 42 and 44
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`have molding surfaces 42a and 44a facing each other; in the lower molding
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`surface 44a, there are provided a large number of columnar recesses 43 at
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`predetermined intervals as shown in Fig. 2(b). And, stipple forming
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`protrusions 45 each formed as a column with a pointed head are fitted into
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`these recesses 43, and stipples 16 are formed by these protrusions 45. And,
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`in a region where the stippling density is to be high, the protrusions 45 are
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`provided close to each other at high density; on the other hand, in a region
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`where the stippling density is to be low, the protrusions 45 are provided
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`sparsely so as to be spaced away from each other, and embedding members
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`46 are embedded in the recesses 43 where no protrusions 45 are to be
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`provided, with the resultant surface being flush. In this way, the stippling light
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`guiding plate 14 is formed, with the stippling density being adjusted.
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`Fig. 2(c) shows another embodiment of the lower mold; a stippling
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`surface forming plate 47 is detachably attached to the molding surface side of
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`the lower mold 44, and flanged stipple forming protrusions 48 and flanged
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`embedding members 49 can be fitted from the back surface 47a side of the
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`plate. Thus, the operation of fitting the protrusions 48 and the embedding
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`members 49 into the plate 47 can be conducted outside the mold 44, which
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`helps to facilitate the operation. Further, there is advantageously little danger
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`of damaging the light guide surface forming side of the protrusions 48 and the
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`embedding members 49 at the time of operation of attaching and detaching
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`these elements. The detachable and replaceable stipple forming protrusions
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`45 (48) of Figs. 2(a) through 2(c) are only shown by way of example; and it is
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`also possible to employ a mold in which the lower mold is directly machined to
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`form stipple forming protrusions on the molding surface.
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`In this way, in the stippling light guiding plate 14, it is possible to adjust
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`the stipple density, that is, the light quantity, solely through adjustment of the
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`number of the stipple forming protrusions 45 (48) in the operation of fitting the
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`stipple forming protrusions 45 (48) and the embedding members 46 (49) or in
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`the operation of forming the stipple forming protrusions through direct
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`machining of the molding surface of the mold, so that, as compared with the
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`conventional light guiding plate having the prism steps, the adjustment of the
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`light quantity is very much facilitated.
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`Thus, by using a stippling light guiding plate, even if the kind of vehicle
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`lamp differs, it is possible to easily form a stippling light guiding plate endowed
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`with a light quantity adjustment performance in accordance with the kind of
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`lamp, which leads to a very high value in terms of use as compared with the
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`conventional light guiding plate with the prism steps, which requires the light
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`quantity adjustment at the stage of designing the mold.
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`Fig. 3(a) shows a second embodiment of the present invention, and Fig.
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`3(b) is an enlarged perspective view of the main portion of the same.
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`This second embodiment has substantially the same construction as
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`that of the first embodiment; however, one end portion 14a of the stippling light
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`guiding plate 14 is provided at a position spaced away from the bulb 13, and, at
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`the same time, there is provided a tubular auxiliary bulb 18 opposite the light
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`guiding plate end portion 14a; in addition to the light from the bulb (main bulb)
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`13, the light from the auxiliary bulb 18 is guided to the forward end portion of the
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`side space 12b via the stippling light guiding plate 14, and is reflected at the
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`stippling reflection portion 15, thereby enhancing the illumination effect.
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`Further, in order to make the lighting of the auxiliary bulb 18 less
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`conspicuous from the outside, the lower portion of the bulb 13 side end edge
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`portion of the stippling light guiding plate 14 is cut out, and, in this cutout 19, the
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`tubular auxiliary bulb 18 is situated so that a part of the stippling light guiding
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`plate 14 covers the upper portion of the auxiliary bulb 18, and, at the same time,
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`embossing 19d is effected on the surface of the light guiding plate end edge
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`portion 14c covering this auxiliary bulb 18.
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`Further, the auxiliary bulb 18 is provided as close as possible to the
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`lamp body 11, thus preventing generation of the shadow of the auxiliary bulb 18
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`due to the light from the bulb 13.
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`Further, the prism steps 20 of the outer lens 10 are formed solely in the
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`region indicated by symbol A where the light of the bulb 13 directly reaches, and
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`the side portion 10a of the outer lens is formed as a non-stepped portion.
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`20
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`Thus, there is no need to form steps on the curved side portion 10a of the outer
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`lens, so that the machining of the mold molding surface for molding the outer
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`lens is so much the easier.
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`Further, the prism step formation region and the end portion 14a of the
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`light guiding plate 14 overlap each other, that is, the region indicated by symbol
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`A and illuminated by the direct illumination of the bulb 13, and the region
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`indicated by symbol B and illuminated by the stippling light guiding plate 14,
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`overlap each other, whereby the boundary line between the direct illumination
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`region A and the stippling illumination region B at the time of lighting of the lamp
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`is inconspicuous. Otherwise, the present embodiment is the same as the first
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`embodiment described above, and the same components are indicated by the
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`same reference numerals, with a description thereof being left out.
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`Figs. 4(a) and 4(b) are main portion perspective views of a third
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`embodiment of the present invention.
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`The third embodiment is substantially of the same construction as the
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`10
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`second embodiment; however, in order to make the auxiliary bulb 18 less
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`conspicuous, the lamp body 11 is provided with a visor member 21 of an
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`L-shaped sectional configuration to cover the tubular auxiliary bulb 18 as shown
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`in Fig. 4(a); or, as shown in Fig. 4(b), a semi-circular cutout 23 is provided
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`substantially at the center in the width direction of the end portion 14a of the
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`stippling light guiding plate 14, and a spherical auxiliary bulb 18a such as a
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`small wedge base bulb is arranged in the cutout 23, with the auxiliary bulb 18a
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`being covered with an L-shaped visor member 22a.
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`Fig. 5 shows a fourth embodiment of the present invention.
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`In this fourth embodiment, the present invention is applied to a
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`reflection type vehicle lamp; it is substantially of the same construction as the
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`second embodiment described above. The bulb 13 mounting surface of the
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`lamp body 11 is formed as a light reflection surface 24 such as a paraboloid,
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`and fisheye steps 25 are formed over the entire inner side region of the outer
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`lens 10. Symbol A1 indicates a range illuminated mainly by the reflection light
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`25
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`from a light reflection surface 24 of the body, and symbol B1 indicates a range
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`illuminated mainly by the reflection light from the stippling reflection portion.
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`Figs. 6(a) and 6(b) show a sixth embodiment of the present invention.
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`In both of these examples, the present invention is applied to an inner
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`lens type vehicle lamp; they are of substantially the same construction as the
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`first and second embodiments.
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`In the example shown in Fig. 6(a), a light guiding space 12 is formed by
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`an inner lens 26 having prism steps 20 on the back surface thereof and by the
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`lamp body 11; the auxiliary bulb 18 is provided at the end portion of the bulb
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`front space 12a constituting a part of the light guiding space 12, and one end
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`10
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`portion 14a of the stippling light guiding plate 14 is arranged opposite this
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`auxiliary bulb 18, with the other end of the stippling light guiding plate 14
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`extending along the side space 12b. Numeral 25 indicates fisheye steps
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`formed on the back surface of the outer lens 10. Symbol A2 indicates a range
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`illuminated through shining of the inner lens mainly by the bulb direct
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`illumination light, and symbol B2 indicates a range illuminated through shining
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`of the inner lens mainly by the reflection light from the stippling reflection
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`portion.
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`In the example shown in Fig. 6(b), the light guiding space 12 is formed
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`by an inner lens 26 having fisheye steps 25 on the front surface and prism steps
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`20
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`20 on the back surface, and by the lamp body 11; one end portion 14a of the
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`stippling light guiding plate 14 is arranged close to and opposite the bulb 13
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`situated in the bulb front space 12a constituting a part of the light guiding space
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`12, with the other end of the light guiding plate extending along the side space
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`12b. Symbol A3 indicates a range illuminated through shining of the inner lens
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`mainly by the bulb direct illumination light, and symbol B3 indicates a range
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`10
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`illuminated through shining of the inner lens mainly by the reflection light from
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`the stippling reflection portion.
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`[Advantages of the Invention]
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`As is apparent from the above description, in the vehicle lamp
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`5
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`according to the present invention, light is guided to the side space which is
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`difficult for the light to reach and which forms a part of the light guiding space of
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`a substantially L-shaped sectional configuration formed by the lamp body and
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`the front lens, so that it is possible to freely adjust the reflection light quantity at
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`the stippling reflection portion through adjustment of the stippling density of the
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`10
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`stippling light guiding plate. And, it is so arranged, for example, that the
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`nearer to the forward end portion of the stippling light guiding plate (the end
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`portion of the side space), the higher the stippling density, whereby even in the
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`case of light attenuated at the light guiding plate end portion, it is possible to
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`guide a sufficient quantity of light to the side space through concentration of
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`15
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`light, making it possible, for example, to uniformly illuminate the entire lamp;
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`thus, it is possible to achieve a marked improvement in terms of visibility at the
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`time of lighting, in particular, the visibility at the side of the lamp, which has
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`been a problem to be solved.
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`
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`Further, the adjustment of the stippling density is made based on the
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`20
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`number of the stipple molding protrusions formed on the molding surface of the
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`mold, so that the adjustment of the stippling density is easy to make, thus
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`making it possible to easily conform to the kind of lamp.
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`
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`Apart from this, as compared with the conventional light guiding plate
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`with prism steps, it also provides the following effects:
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`25
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`(1) There is no need to take into account the angle, depth, and interval of the
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`11
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`reflection surface as in the case of the prism steps, so that it is possible for the
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`stippling light guiding plate to conform to a complicated configuration.
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`(2) Since diffused reflection occurs at each stipple, there is involved little
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`variation in brightness depending on the seeing angle as in the case of the
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`5
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`prism steps, and it is possible to attain a uniform illumination.
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`(3) There are formed no shadow portions between the steps as in the case of
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`the prism steps, so that there is involved no unevenness in light, and the
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`reflection light quantity also increases.
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`4. Brief Description of the Drawings
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`10
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`Fig. 1 is a main portion sectional view of the first embodiment of the
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`present invention, Fig. 2(a) is a sectional view of a stippling light guiding plate
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`forming mold, Figs. 2(b) and 2(c) are explanatory views illustrating stippling
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`density adjusting methods, Fig. 3(a) is a main portion sectional view of the
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`second embodiment of the present invention, Fig. 3(b) is an enlarged
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`15
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`perspective view of a part thereof, Figs. 4(a) and 4(b) are main portion
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`perspective views of the third embodiment of the present invention, Fig. 5 is a
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`main portion sectional view of the fourth embodiment of the present invention,
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`Figs. 6(a) and 6(b) are main portion sectional views of the fifth and sixth
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`embodiments of the present invention, and Fig. 7 is a main portion sectional
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`20
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`view of a conventional vehicle lamp.
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`10 … outer lens constituting the front surface lens,
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`11 … lamp body,
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`12 … light guiding space of a substantially L-shaped sectional
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`configuration,
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`25
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`12a … bulb front space constituting a part of the light guiding space,
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`12
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`12b … bulb side space constituting a part of the light guiding space,
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`13 … bulb constituting the light source,
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`14 … stippling light guide plate,
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`15 … stippling reflection portion,
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`16 … stipple,
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`18, 18a … auxiliary bulb,
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`26 … inner lens constituting the front surface lens.
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`Applicant: Koito Manufacturing Co., Ltd.
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`Agent: Hidehito Yagi, Patent Attorney
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`5
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`10
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`14
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`CERTIFICATE OF TRANSLATION
`
`I, Takuya Takahashi, of Tokyo, Japan, hereby certify that I am conversant
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`in both Japanese and English and the following is, to the best of my
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`knowledge and belief, a true and accurate translation of the original
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`document from Japanese to English.
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`I hereby acknowledge
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`that
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`any willful
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`false
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`statements
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`and
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`the
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`this Declaration are punishable
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`by
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`fine
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`or
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`imprisonment,
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`or
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`1001). Furthermore, I declare that all statements made of my own
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`knowledge are true and all statements made on information and belief are
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`believed to be true.
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`Translated Material: JP H1-92004U
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`
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`of Executed on this 29th day December, 2014 at Tokyo,
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`Japan.
`
`akuya Takahashi
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