[19] China National Intellectual Property Administration, CNIPA
`
`[51] Int. CL
`H02K 33/00 (2006.01)
`H02K 21/02 (2006.01)
`
`[12] Invention Patent Application Publication Specification
`[21] Application number. 200910105497.2
`
`
`
`[43] Publication date: July 22, 2009
`
`[11] Publication number: CN 101488697A
`
`
`
`
`
`
`
`
` 1
`
` page of claims, 5 pages of description, 3 pages
`of drawings
`
`[22] Application date: 2009.2.20
`[21] Application number: 200910105497.2
`[71] Applicant: AAC Acoustics Technology (Shenzhen) Co., Ltd.
` Address:, No. 18 Xinxi Road, North Zone, High-tech Industrial
`Park, Nanshan District, Shenzhen, Guangdong Province, 518057
` Co-applicant: AAC Acoustics Technology (Changzhou) Co., Ltd.
`[72] Inventors: Dong Leping; Pu Yonghua
`
`
`
`
`
`
`
`
`
`[54] Title
`Flat linear vibration motor
`[57] Abstract
`A flat linear vibration motor, which comprises an upper
`cover, a base that mates the upper cover to form an accommodating
`space, a coil received in the accommodating space and positioned on
`the base, elastic supports connected to the base, and a permanent
`magnet suspended within the accommodating space by the elastic
`supports, wherein the base is provided with a plurality of side walls
`and a bottom wall perpendicular to the side walls; the coil is
`arranged on the bottom wall and located below the permanent
`magnet in the central position with a gap between the coil and the
`permanent magnet; magnetic poles of the permanent magnet
`directly face the coil, and the magnetic poles of the permanent
`magnet directly facing the coil are polarized in opposite direction;
`and the elastic support is provided with a fixing portion connected to
`the base, an elastic arm extending from the fixing portion and facing
`the fixing portion and having an elastic deformation direction parallel
`to the bottom wall of the base, and an engaging portion extending
`from the elastic arm and connected to the permanent magnet such
`that the permanent magnet can move in a direction parallel to the
`bottom wall.
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`Exhibit 1011 - Page 1 of 10
`
`

`

`
`Claims
`Page 1/1
`
`
`
`
`
`
`
`
`200910105497.2
`1. A flat linear vibration motor, which comprises an upper cover, a base that mates the upper cover to form an
`accommodating space, a coil received in the accommodating space and positioned on the base, elastic supports
`connected to the base, and a permanent magnet suspended within the accommodating space by the elastic supports,
`wherein the base is provided with a plurality of side walls and a bottom wall perpendicular to the side walls, the coil is
`arranged on the bottom wall and located below the permanent magnet in the central position with a gap between the
`coil and the permanent magnet, characterized in that: magnetic poles of the permanent magnet directly face the coil,
`and the magnetic poles of the permanent magnet directly facing the coil are polarized in opposite direction; and the
`elastic support is provided with a fixing portion connected to the base, an elastic arm extending from the fixing portion
`and facing the fixing portion and having an elastic deformation direction parallel to the bottom wall of the base, and an
`engaging portion extending from the elastic arm and connected to the permanent magnet such that the permanent
`magnet can move in a direction parallel to the bottom wall.
`2. The flat linear vibration motor according to claim 1, wherein the permanent magnet is an integral structure.
`3. The flat linear vibration motor according to claim 1, wherein the permanent magnet comprises two separate
`magnets.
`4. The flat linear vibration motor according to claim 1, 2 or 3, wherein the permanent magnet is connected to
`the elastic arm of the elastic support through a counterweight, the counterweight being provided with a main body and
`a positioning portion extending from the main body and connected to the elastic arm, the main body being provided
`with a through hole, and the permanent magnet being fixed in the through hole.
`5. The flat linear vibration motor according to claim 4, wherein the material density of the counterweight is not
`less than 7.8 g/cm3.
`6. The flat linear vibration motor according to claim 1, wherein the fixing portion of the elastic support is
`provided with a first positioning portion positioned on a certain side wall of the base and a second positioning portion
`extended from the first positioning portion and positioned on a side wall adjacent to the certain side wall.
`7. The flat linear vibration motor according to claim 1 or 6, wherein the engaging portion of the elastic support
`comprises a clamp extending from a side edge of the elastic arm away from the fixing portion, the clamp being
`composed of an upper clamping portion and a lower clamping portion extending from two side edges of the elastic arm
`and opposite each other.
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`2
`
`Exhibit 1011 - Page 2 of 10
`
`

`

`200910105497.2
`
`
`
`
`
`
`
`
`
`Description
`
`Flat linear vibration motor
`
`
`
`
`
`
`
`
`
`Page 1/5
`
`[Technical field]
`The invention relates to a vibration motor, and in particular to a flat linear vibration motor used in portable
`consumer electronic products.
`[Background]
`Portable consumer electronic products, such as mobile phones, handheld game consoles, navigation devices, or
`handheld multimedia entertainment devices, generally use vibration motors for system feedback, such as incoming call
`prompts for mobile phones, vibration feedback for game consoles and the like. The motors used therein mainly include
`cylindrical iron core motors, coreless motors, and flat motors.
`With the development of consumer electronic products towards lightness and thinness, their various internal
`components also need to adapt to the trend towards lightness and thinness. Motors are no exception.
`Linear vibration motor refers to the reciprocating motion in which the vibration direction of the vibrator is a
`straight line. It is widely used and installed on consumer electronics products for its stable vibration and low noise. For
`the structure of the linear vibration motor, please refer to Chinese patent application No. CN200480000815.4 published
`on November 23, 2005, US patent No. 6,466,682 published on October 15, 2002, and US patent No. 7,099,489 published
`on August 29, 2006, etc.
`However, the vibration direction of the vibrator of the above-mentioned vibration motor is vertical, that is, it is
`perpendicular to the installation plane. Because the vibration direction is perpendicular to the installation plane, it is
`necessary to provide a large vertical height for the vibrator to move up and down, thus increasing the height of the
`entire motor, which is not conducive to the development of thinness.
`Therefore, it is necessary to propose a new technical solution to reduce the height of the motor.
`[Summary]
`The technical problem to be solved by the present invention is to provide a flat linear vibration motor with
`reduced height.
`The present invention solves the above-mentioned technical problem using the following technical solution:
`A flat linear vibration motor, which comprises an upper cover, a base that mates the upper cover to form an
`accommodating space, a coil received in the accommodating space and positioned on the base, elastic supports
`connected to the base, and a permanent magnet suspended within the accommodating space by the elastic supports,
`wherein the base is provided with a plurality of side walls and a bottom wall perpendicular to the side walls; the coil is
`arranged on the bottom wall and located below the permanent magnet in the central position with a gap between the
`coil and the permanent magnet; magnetic poles of the permanent magnet directly face the coil, and the magnetic poles
`of the permanent magnet directly facing the coil are polarized in opposite directions; and the elastic support is provided
`with a fixing portion connected to the base, an elastic arm extending from the fixing portion and facing the fixing portion
`and having an elastic deformation direction parallel to the bottom wall of the base, and an engaging portion extending
`from the elastic arm and connected to the permanent magnet such that the permanent magnet can move in a direction
`parallel to the bottom wall.
`
`
`
`
`
`
`
`
`
`
`
`
`
`3
`
`
`
`Exhibit 1011 - Page 3 of 10
`
`

`

`
`
`
`
`
`Description page 2/5
`
`
`
`
`200910105497.2
`As an improvement of the present invention, the permanent magnet is an integral structure.
`As an improvement of the present invention, the permanent magnet comprises two separate magnets.
`As an improvement of the present invention, the permanent magnet is connected to the elastic arm of the
`elastic support through a counterweight, the counterweight being provided with a main body and a positioning portion
`extending from the main body and connected to the elastic arm, the main body being provided with a through hole, and
`the permanent magnet being fixed in the through hole.
`As an improvement of the present invention, the material density of the counterweight is not less than 7.8
`
`g/cm3.
`
`As an improvement of the present invention, the fixing portion of the elastic support is provided with a first
`positioning portion positioned on a certain side wall of the base and a second positioning portion extending from the
`first positioning portion and positioned on a side wall adjacent to the certain side wall.
`As an improvement of the present invention, the engaging portion of the elastic support comprises a clamp
`extending from a side edge of the elastic arm and away from the fixing portion, the clamp being composed of an upper
`clamping portion and a lower clamping portion extending from two side edges of the elastic arm and opposite each
`other.
`
`Compared with the prior art, the present invention has the following advantages: because the vibration
`direction is parallel to the bottom wall, the thickness in the height direction can be greatly reduced.
`[Description of drawings]
`Fig. 1 is a perspective view of a flat linear vibration motor of the present invention.
`Fig. 2 is an exploded perspective view of the flat linear vibration motor of the present invention.
`Fig. 3 is a top view of the flat linear vibration motor of the present invention, with an upper cover removed for
`viewing.
`Fig. 4 is a schematic perspective view of an elastic support of the flat linear vibration motor of the present
`invention.
`Fig. 5 is a sectional view along a line A-A in Fig. 3 .
`Fig. 6 is a schematic view of the principle of the flat linear vibration motor of the present invention.
`Fig. 7 is a schematic view of another embodiment of the present invention.
`[Detailed description]
`The content of the present invention will be described in detail below in conjunction with the accompanying
`drawings.
`The present invention is a flat linear vibration motor, which is mainly used in consumer electronic products such
`as mobile phones and handheld game consoles.
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`4
`
`Exhibit 1011 - Page 4 of 10
`
`

`

`
`
`
`
`
`Description page 3/5
`
`
`
`
`200910105497.2
`Referring to FIG. 1 to FIG. 3, a flat linear vibration motor 10 comprises an upper cover 11, a base 12 that mates
`with the upper cover 11 to form an accommodating space, a toroidal coil 13, a plurality of elastic supports 14, a
`counterweight 15, and a permanent magnet 16.
`The base 12 is provided with a plurality of side walls 121 and a bottom wall 122 perpendicularly connected to
`the side walls 121. The coil 13 is positioned on the bottom wall 122 and has its coil lead (not shown) welded to a
`conducting plate 123 positioned on the bottom wall 122, in order to obtain an alternating current from the outside. The
`elastic supports 14 are positioned on the base 12, preferably, positioned on the side walls 121 of the base 12. The
`counterweight 15 is suspended within the accommodating space by the elastic supports 14. The counterweight 15
`comprises a main body 151 and a plurality of positioning portions 152 extending from the main body 151, and these
`positioning portions 152 cooperate with the elastic supports 14 to assemble the counterweight and the elastic supports.
`A through hole 153 is provided in the central position of the main body 151, and the through hole 153 is used for
`positioning the permanent magnet 16 therein. Therefore, both the counterweight 15 and the permanent magnet 16 are
`suspended within the accommodating space by the elastic supports 14.
`Referring to FIG. 4 and FIG. 5, the elastic support 14 comprises a fixing portion 141 positioned on the side wall
`121 of the base 12, an elastic arm 142 extending from the fixing portion 141 and facing the fixing portion 141 and
`elastically deforming towards the fixing portion 141 or away from the fixing portion 141 (i.e., an X-X direction shown in
`FIG. 4), and an engaging portion 144 extending from the elastic arm 142 and cooperating with the positioning portion
`152 of the counterweight 15. In practice, the elastic deformation direction of the elastic arm 142 is perpendicular to the
`side wall 121 of the base 12. Preferably, the elastic arm 142 is connected to the fixing portion 141 by a U-shaped
`connecting portion 143, so as to increase the elasticity of the elastic arm 142. In practice, the elastic arm 142 can also be
`bent and extended directly from an end of the fixing portion 141, such that the elastic arm 142 and the fixing portion
`141 form a V shape. The engaging portion 144 and the positioning portion 152 of the counterweight 15 can be
`assembled by mechanical means such as bonding, welding, injection molding and the like. In this embodiment, a method
`for stably assembling the positioning portion 152 is provided, that is, the engaging portion 144 comprises a clamp
`extending from a side edge of the elastic arm 142 away from the fixing portion 141. Preferably, the clamp comprise an
`upper clamping portion 144a and a lower clamping portion 144b extending from two side edges of the elastic arm 142
`and opposite each other. The upper clamping portion 144a and the lower clamping portion 144b are respectively
`positioned on the upper and lower sides of the positioning portion 152, that is, the counterweight 15 is positioned in a
`clamping manner. In order to make the assembling more reliable, means such as bonding with glue, welding and the like
`can be further used. The coil 13 and the permanent magnet 16 are placed such that the coil 13 is located below the
`permanent magnet 16 in the central position, and there is a gap perpendicular to the direction of the bottom wall 122
`between the coil 13 and the permanent magnet 16. In order to better fix the elastic support 14, its fixing portion 141 is
`provided with a first positioning portion 141a positioned on a certain side wall of the base 12 and a second position
`portion 141b extending from the first positioning portion 141a and positioned on a side wall adjacent to the certain side
`wall, in order to make the positioning effect of the elastic support 14 more stable.
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`5
`
`
`
`Exhibit 1011 - Page 5 of 10
`
`

`

`
`
`
`
`
`Description page 4/5
`
`
`
`
`200910105497.2
`Further referring to FIG. 5, in this embodiment, the permanent magnet 16 positioned within the through hole
`153 of the counterweight 15 is an integral structure. However, a two-pole magnetization method is used such that
`magnetic poles of its one half (labeled 16a) are polarized opposite to magnetic poles of the other half (labeled 16b), and
`magnetic pole planes of the permanent magnet 16 are parallel to the bottom wall 122 of the base 12 (also parallel to the
`coil 13), that is, the N pole or S pole of the permanent magnet 16 directly faces the bottom wall 122 of the base 12 (also
`directly faces the coil 13).
`Referring to FIG. 6, the counterweight weight 15, the permanent magnet 16, and the coil 13 are taken out to
`illustrate the principle. The coil 13 obtains an alternating current from the outside, the current flowing along the winding
`direction of the coil 13, as shown in the figure. At a certain moment, the direction of the current in the coil 13 is as
`shown in the figure, wherein the direction of the current in the left ring is perpendicular to the page of the figure and
`inward, marked as
` in the figure, and the direction of the current in the right ring is perpendicular to the page of the
` in the figure. Directions of magnetic force lines at positions of the rings are simply and
`figure and outward, marked as
`schematically indicated in the figure. According to the left-hand rule, the magnetic field force on the left ring is F1 with a
`direction to the right, the magnetic field force on the right ring is F2 with a direction also to the right, and both forces
`have the same magnitude, and therefore, the direction of the magnetic field force on the entire coil is to the right.
`However, since the coil 13 itself is positioned on the base, the coil cannot move, but due to the relationship between the
`action force and the reaction force, the two halves of the permanent magnet 16 are respectively subjected to F1' and
`F2', which are opposite in direction to F1 and F2 and have the same magnitude. Moreover, both the permanent magnet
`16 and the counterweight 15 are suspended within the accommodating space, and the elastic deformation direction of
`the elastic arm 142 (referring to FIG. 4 and FIG. 5) of the elastic support 14 is perpendicular to the side wall 121 of the
`base 12, that is, it is parallel to the bottom wall 122, and therefore, the permanent magnet 16 and the counterweight 15
`move together to the left (in the direction of arrows F1', F2’ in the figure) under the action of the magnetic field force. If
`the direction of the current changes, the permanent magnet 16 moves to the right together with the counterweight 15.
`In this way, a left-right reciprocating motion, i.e., a vibration parallel to the bottom wall, is generated.
`The counterweight 15 functions to strengthen the vibrating force, making the vibration stronger. However, in
`practice, the counterweight may be omitted, that is, the permanent magnet 16 is directly connected to the elastic
`supports 14. In addition, if the counterweight is used, it is preferable to use a material with a density of not less than 7.8
`g/cm3, such as nickel, tungsten and alloys thereof.
`Referring to FIG. 7, another embodiment of the present invention is shown where two magnets 17, 18 are
`provided as permanent magnets, and magnetic pole directions of the two magnets are opposite, which can also produce
`the same effect as the previous embodiment. The two magnets can be assembled together by bonding or other
`methods. Alternatively, they can be placed separately by means of providing two through holes in the counterweight,
`with the same effect as above. Therefore, in practice, either an integral permanent magnet or a permanent magnet
`composed of two magnets is feasible, as long as the permanent magnet has opposite poles on the side facing the
`bottom wall of the base.
`
`
`
`
`
`
`
`
`
`
`
`6
`
`
`
`
`
`
`
`Exhibit 1011 - Page 6 of 10
`
`

`

`
`
`
`
`
`Description page 5/5
`
`
`
`
`200910105497.2
`Because the vibration direction is parallel to the bottom wall, the thickness in the height direction can be greatly
`reduced, and theoretically, the distance between the upper cover and the permanent magnet or the counterweight can
`be infinitely small, and the distance between the permanent magnet or the counterweight and the coil can also be
`infinitely small. In practical applications, consumer electronics products are strictly required in thickness, that is, the
`thickness is required to be as small as possible, but the width is less strictly required relative to the thickness.
`The above description gives preferred embodiments of the present invention, and the scope of protection of the
`present invention is not limited by the above embodiments. Any equivalent modifications or changes made by those
`skilled in the art based on the disclosure of the present invention should be included in the scope of protection of the
`claims.
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`7
`
`Exhibit 1011 - Page 7 of 10
`
`

`

`200910105497.2
`
`
`
`
`
`
`
`
`
`Drawings
`
`
`
`
`
`
`
`
`
`Page 1/3
`
`FIG. 1
`
`
`
`
`
`FIG. 2
`8
`
`
`
`
`
`Exhibit 1011 - Page 8 of 10
`
`

`

`200910105497.2
`
`
`
`
`
`
`
`
`
`Drawings
`
`
`
`
`
`
`
`
`
`Page 2/3
`
`FIG. 3
`
`FIG. 4
`
`
`
`
`
`
`
`FIG. 5
`9
`
`
`
`
`
`Exhibit 1011 - Page 9 of 10
`
`

`

`200910105497.2
`
`
`
`
`
`
`
`
`
`Drawings
`
`
`
`
`
`
`
`
`
`Page 3/3
`
`
`
`
`
`FIG. 6
`
`FIG. 7
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`10
`
`
`Exhibit 1011 - Page 10 of 10
`
`