JP2007193216A - Lens driving module and camera module - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a lens driving module and a camera module capable of compatibly securing the degree of freedom in design while achieving thinning on a high level. <P>SOLUTION: The degree of freedom is secured and plane space is decreased by supporting a gear shaft 18 equipped with a reduction gear 10 and a feed screw shaft 19 equipped with a reduction gear 11 through a gear receiver 12 in space under a rotor 9 while achieving thinning by using a stepping motor 8. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a lens driving module used for focusing and zooming and a camera module configured with the device, and is mounted on, for example, a card-type digital camera or a mobile phone with a camera as a portable electronic device. Is preferred.

  In recent years, in an imaging apparatus such as a digital still camera, improvement of portability and usability has been demanded, and the entire apparatus has been downsized. Optical system barrels and lenses used in the imaging apparatus have been downsized. However, there is a strong demand for higher image quality and higher pixels, and there is a demand for downsizing the optical system barrel by downsizing the lens moving device. Recently, mobile phones equipped with camera modules that are smaller and thinner than digital still cameras are also equipped with autofocus and optical zoom functions, making the optical lens barrel thinner and lower in cost. Is required.

  In order to cope with downsizing, it has been proposed to use a motor (converter type) configured in a flat shape and configure a lens driving module that is thin in the optical axis direction of the lens group. (For example, refer to Patent Document 1).

On the other hand, when the number of pixels of the image sensor is increasing and high quality images are required, a combination of multiple lens groups is required, and accordingly the thickness of the camera module is determined by the thickness of the lens group There is. Although downsizing (planar size) as a camera module is also required, a configuration with an emphasis on thinness increases design restrictions and reduces the degree of freedom in designing in the planar direction. For this reason, there is a need for a technology that can increase the degree of freedom of design while reducing the thickness of the camera module in a limited space and that can obtain a high-quality image. .
JP 2005-275375 A

  The present invention has been made in view of the above situation, and an object of the present invention is to provide a lens driving module and a camera module that can achieve a high degree of design freedom while achieving a reduction in thickness.

  The first aspect of the present invention for achieving the above object comprises a moving means for supporting the lens frame holding the lens group inside the case so as to be reciprocally movable in the optical axis direction, and reciprocating the lens frame, The lens driving module includes a driving unit that moves the lens frame via the moving unit, and an auxiliary base that supports the moving unit is provided inside the case.

  In the first aspect, by supporting the moving means by the auxiliary base, the moving means can be supported in the plane direction independently of the support state of the driving means on the case side, and the degree of freedom in design is increased. improves.

  According to a second aspect of the present invention, in the lens driving module according to the first aspect, the moving means includes a feed screw member that reciprocally moves the lens frame, and an output of the drive means that decelerates the output to the feed screw member. The lens driving module has a plurality of reduction gear members for transmission, and at least one reduction gear member is supported on the auxiliary base.

  In the second aspect, the degree of freedom for supporting the reduction gear member that transmits power to the feed screw member in the planar direction can be improved.

  According to a third aspect of the present invention, in the lens driving module according to the first or second aspect, the driving means is a stepping motor, and the stepping motor is integrally provided with the yoke connecting portion at the end of the core portion. A coil block having an exciting coil wound around the iron core and the core portion and arranged along one surface of the case, and a magnetic path portion other than the end portion connected to the yoke connecting portion without overlapping the coil block A lens driving module comprising: a yoke provided with a rotor passage hole in a magnetic path portion; and a rotor disposed in the rotor passage hole of the yoke.

  In the fourth aspect, in a module using a stepping motor including a coil block, a yoke, and a rotor, the degree of freedom in the arrangement design of the moving means is improved only by the position of the rotor being governed in relation to the yoke shape. be able to.

  According to a fourth aspect of the present invention, in the lens driving module according to the third aspect, the case has a rectangular planar shape, a rotor is disposed at substantially the center of one side of the rectangular shape, and an excitation coil is provided. In the lens driving module, the winding core portion extends outward from the lens frame around the rotor, and has a V shape.

  In the fourth aspect, since the yoke shape can be made symmetric according to the V shape, the balance of the magnetic circuit can be improved.

  According to a fifth aspect of the present invention, in the lens driving module according to the third aspect, the case has a rectangular planar shape, a rotor is disposed at a substantially rectangular portion of the rectangular shape, and the exciting coil is wound. The lens driving module is characterized in that the core portion that extends to the rectangular adjacent sides around the rotor is L-shaped.

  In the fifth aspect, since the yoke shape can be made symmetric according to the L-shape, the balance of the magnetic circuit can be improved.

  According to a sixth aspect of the present invention, in the lens driving module according to the third aspect, the case has a rectangular planar shape, and a rotor is disposed substantially at the center of one side of the rectangular shape. The lens driving module is characterized in that a core portion around which the exciting coil is wound is extended along the other side portion adjacent to the one side portion and arranged in parallel with each other.

  In the sixth aspect, since the yoke shape can be made symmetric according to the coil blocks arranged in parallel to each other, the balance of the magnetic circuit can be improved.

  According to a seventh aspect of the present invention, there is provided a camera module characterized in that the lens driving module according to any one of the first to sixth aspects includes an imaging device.

  In the seventh aspect, a camera module including a lens driving module capable of supporting the moving unit in a planar direction independently of the support state of the driving unit on the case side and having improved design freedom; can do.

  The lens driving module and the camera module of the present invention can be a lens driving module and a camera module that can achieve a high degree of design freedom while achieving a reduction in thickness.

  1 is an exploded perspective view of a camera module including a lens driving module according to the first embodiment of the present invention, FIG. 2 is an overall configuration of the camera module, FIG. 3 is a plan view of the camera module, and FIG. FIG. 5 is a perspective view of a stepping motor, FIG. 6 is an exploded perspective view of a camera module having a lens driving module according to a second embodiment of the present invention, and FIG. FIG. 8 is a plan view of the camera module, FIG. 9 is a view taken along line IX-IX in FIG. 7, FIG. 10 is a top perspective view of the stepping motor, and FIG. FIG. 12 is a perspective view of the lower surface side, FIG. 12 is an overall configuration of a camera module including a lens driving module according to a third embodiment of the present invention, FIG. 13 is a plan view of the camera module, and FIG. V-XIV view taken along line, in Figure 15 there is shown a perspective view of a stepping motor.

  The camera module shown in FIG. 1 to FIG. 15 is suitable for application as an electronic device to a part having a limited space, such as a mobile phone camera or a PC camera.

  A first embodiment of the present invention will be described with reference to FIGS.

  As shown in FIGS. 1 and 4, as a housing of the lens driving module of the camera module 1 (case: the planar shape is rectangular), a cover 2 provided with a fixed lens on the subject side, a CCD, etc. The image sensor 3 and the circuit board 4, and a base plate 5 provided with a fixed lens on the image sensor side. A lens barrel holder 6 as a lens frame for holding the lens group is supported so as to be movable up and down along the guide shaft 7. The lens barrel holder 6 is driven up and down by a stepping motor 8 as a driving means.

  The output of the stepping motor 8 is transmitted from the rotor 9 to the feed screw shaft 19 via the reduction gears 10 and 11 as moving means, and the lens barrel holder 6 is driven up and down. Between the base plate 5 and the cover 2, a gear receiver 12 is provided as an auxiliary base that independently supports the reduction gears 10 and 11 below the stepping motor 8.

  Reference numeral 13 denotes a photo interrupter for detecting a predetermined position (reference position) of the lens barrel holder 6, and 14 is a base plate 5 for biasing the lens barrel holder 6 upward. A coil spring disposed between the lens barrel holders 6, 15 a drive gear provided in the rotor 9, 16 a coil block of the stepping motor 8, 17 a yoke of the stepping motor 8, and 18 a gear shaft of the reduction gear 10. , 27 is an iron core, and 20 is a shielding portion provided integrally with the lens barrel holder 6. The position of the shielding unit 20 is detected by the photo interrupter 13.

  The camera module 1 will be specifically described with reference to FIGS.

  A circuit board 4 provided with the image sensor 3 is connected to the lower surface of the base plate 5, and a guide shaft 7 is erected on the base plate 5. A barrel holder 6 is supported on the guide shaft 7 so as to be movable up and down, and the barrel holder 6 is biased upward by a coil spring 14. A lens barrel 25 is held by the lens barrel holder 6, and the lens barrel 25 is arranged to face the image sensor 3. A plate-shaped gear receiver 12 constituting a case is disposed on the base plate 5 on the side of the lens barrel holder 6, and a stepping motor 8 is held between the gear receiver 12 and the cover 2.

  The rotor 9 of the stepping motor 8 passes through the gear receiver 12 and is supported across the cover 2 and the base plate 5, and the gear shaft 18 of the reduction gear 10 is supported across the gear receiver 12 and the base plate 5. A drive gear 15 is formed on the rotation shaft of the rotor 9, and the reduction gear 10 is engaged with the drive gear 15. An output gear 21 is formed on the gear shaft 18 of the reduction gear 10, and the reduction gear 11 of the feed screw shaft 19 is engaged with the output gear 21. The upper end portion of the feed screw shaft 19 is supported by the gear receiver 12, and the nut portion 23 of the barrel holder 6 is engaged with the screw portion 22 of the feed screw shaft 19.

  That is, the driving force of the stepping motor 8 is transmitted to the feed screw shaft 19 via the rotor 9, the drive gear 15, the reduction gear 10, the output gear 21, and the reduction gear 11. The lens barrel holder 6 reciprocates along the guide shaft 7 via the nut portion 23.

  The gear shaft 18 of the reduction gear 10 is supported across the gear receiver 12 and the base plate 5, and the upper end portion of the feed screw shaft 19 is supported by the gear receiver 12. The support of the feed screw shaft 19 is not restricted. For this reason, the reduction gears 10 and 11 can be arranged in an arbitrary space below the rotor 9, and the plane space can be reduced.

  The stepping motor 8 will be specifically described.

  The coil block 16 of the stepping motor 8 has an iron core 27 in which a yoke connecting portion 26 is integrally provided at the end of the core portion, and an exciting coil 28 wound around the core portion. ) Along one side. An end of the yoke 17 is connected to the yoke connecting portion 26, and the magnetic path portion other than the end portion is provided without overlapping the coil block 16, and the rotor 17 is formed in the magnetic path portion. The rotor 9 is disposed in the rotor through-hole 29 of the yoke 17. A drive pulse is applied to the exciting coil 28, and the rotor 9 rotates at a step angle of, for example, 180 ° by the magnetic pole action with the rotor 9.

  As shown in FIGS. 2 and 3, the rotor 9 is disposed substantially at the center of one side of the base plate 5 which is a rectangular case, and the core portion around which the exciting coil 28 is wound is the lens barrel holder 6 around the rotor 9. Each of them extends outward and forms a V shape. Thereby, since the shape of the yoke 17 can be made symmetrical according to the V-shaped coil block 16, the balance of the magnetic circuit can be improved.

  In the camera module 1 described above, the gear receiver 12 is provided between the cover 2 and the base plate 5, and the gear shaft 18 including the reduction gear 10 and the feed screw shaft 19 including the reduction gear 11 are supported by the gear receiver 12. The reduction gears 10, 11 can be arranged in an arbitrary space below the rotor 9 of the stepping motor 8 using the gear receiver 12, and the reduction gears 10, 11 transmitting power to the feed screw shaft 19 in the plane direction. The degree of freedom for support can be improved. In the module using the thin stepping motor 8 having the coil block 16, the yoke 17, and the rotor 9, the position of the rotor 9 is only controlled in relation to the shape of the yoke 17. It is possible to improve the degree of freedom in the layout design of the gear shaft 18 provided with the above and the feed screw shaft 19 provided with the reduction gear 11.

  A second embodiment of the present invention will be described with reference to FIGS.

  As shown in FIGS. 6 and 9, as a housing (case) of the lens driving module of the camera module 31, a cover 32 having a rectangular shape with a fixed lens on the subject side, an image sensor 33 such as a CCD, and the like A circuit board 34 and a base plate 35 having a rectangular planar shape provided with a fixed lens on the imaging element side are provided. A lens barrel holder 36 as a lens frame for holding the lens group is supported so as to be movable up and down along a guide shaft 37, and the lens barrel holder 36 is driven up and down by a stepping motor 38 as a driving means.

  The output of the stepping motor 38 is transmitted from the rotor 39 to the feed screw shaft 55 via the reduction gears 40 and 41 as moving means, and the lens barrel holder 36 is driven up and down. Between the base plate 35 and the cover 32, there is provided a second base 42 as an auxiliary base having a rectangular planar shape for independently supporting the reduction gears 40 and 41 on the upper side of the stepping motor 38.

  In the figure, reference numeral 43 denotes a photo interrupter for detecting a predetermined position (reference position) of the lens barrel holder 36, and 44 denotes a cover 32 for biasing the lens barrel holder 36 downward. A coil spring disposed between the lens barrel holder 36, 45 a drive gear provided in the rotor 39, 50 a rotating shaft of the rotor 39, 46 a coil block of the stepping motor 38, 47 a yoke of the stepping motor 38 , 48 is a gear shaft of the reduction gear 40, and 49 is a shielding portion provided integrally with the lens barrel holder 36. The position of the shielding part 49 is detected by the photo interrupter 43.

  The camera module 31 will be specifically described with reference to FIGS.

  A circuit board 34 having an image sensor 33 is connected to the lower surface of the base plate 35, and a guide shaft 37 is erected on the base plate 35. A barrel holder 36 is supported on the guide shaft 37 so as to be movable up and down, and the barrel holder 36 is biased downward by a coil spring 44. A lens barrel 53 is held in the lens barrel holder 36, and the lens barrel 53 is arranged to face the image sensor 33. A stepping motor 38 is disposed on the base plate 35 on the side of the lens barrel holder 36, and a second base 42 is provided on the base plate 35 with the stepping motor 38 interposed therebetween.

  The rotary shaft 50 of the rotor 39 of the stepping motor 38 is supported across the cover 32 and the base plate 35 through the second base 42, and the gear shaft 48 of the reduction gear 40 is disposed on the upper side of the stepping motor 38. And is supported. A drive gear 45 is formed on the rotation shaft 50 of the rotor 39, and a reduction gear 40 is engaged with the drive gear 45. An output gear 51 is formed on the gear shaft 48 below the reduction gear 40, and the reduction gear 41 of the feed screw shaft 55 is engaged with the output gear 51. The lower end portion of the feed screw shaft 55 is supported by the second base 42, and the nut portion 57 of the barrel holder 36 is engaged with the screw portion 56 of the feed screw shaft 55.

  That is, the driving force of the stepping motor 38 is transmitted to the feed screw shaft 55 via the rotor 39, the drive gear 45, the reduction gear 40, the output gear 51, and the reduction gear 41, and the screw portion 56, The lens barrel holder 36 reciprocates along the guide shaft 37 via the nut portion 57.

  Since the gear shaft 48 of the reduction gear 40 is supported across the second base 42 and the cover 32 and the lower end portion of the feed screw shaft 55 is supported by the second base 42, the gear shaft is supported with respect to the support of the rotor 39. 48, the support of the feed screw shaft 55 is not restricted. For this reason, the reduction gears 40 and 41 can be arranged in an arbitrary space above the rotor 39 using the second base 42, and the plane space can be reduced.

  The stepping motor 38 will be specifically described.

  The coil block 46 of the stepping motor 38 includes an iron core 62 in which a yoke connecting portion 61 is integrally provided at the end of the core portion, and an exciting coil 63 wound around the core portion. The coil block 46 includes a base plate 35 (case). It is arranged along one side. The yoke connecting portion 61 is connected to the end of the yoke 47. The yoke 47 is provided with a magnetic path portion other than the end portion not overlapping the coil block 46, and has a rotor through hole 64 in the magnetic path portion. A rotor 39 is disposed in the rotor through hole 64 of the yoke 47. A drive pulse is applied to the exciting coil 63, and the rotor 39 rotates at a step angle of, for example, 180 ° by the magnetic pole action with the rotor 39.

  As shown in FIGS. 8, 10, and 11, the rotor 39 is disposed at a substantially rectangular corner portion of the base plate 35 that is a rectangular case, and the core portion around which the exciting coil 63 is wound is centered on the rotor 39. Each of the rectangular adjacent sides extends in an L shape. Thereby, since the shape of the yoke 47 can be made symmetrical according to the L-shaped coil block 46, the balance of the magnetic circuit can be improved.

  In the camera module 31 described above, the second base 42 is provided between the cover 32 and the base plate 35, and the gear shaft 48 including the reduction gear 40 and the feed screw shaft 55 including the reduction gear 41 are supported by the second base 42. Therefore, the reduction gears 40 and 41 can be arranged in an arbitrary space above the rotor 39 of the stepping motor 38, and the degree of freedom for supporting the reduction gears 40 and 41 that transmit power to the feed screw shaft 55 in the planar direction is increased. Can be improved. In the module using the thin stepping motor 38 having the coil block 46, the yoke 47 and the rotor 39, the position of the rotor 39 is only controlled in relation to the shape of the yoke 47. It is possible to improve the degree of freedom in designing the arrangement of the gear shaft 48 having the above and the feed screw shaft 55 having the reduction gear 41.

  A third embodiment of the present invention will be described with reference to FIGS.

  As shown in the figure, as a case (case) of the lens driving module of the camera module 71, a cover 72 having a rectangular shape with a fixed lens on the subject side, an image pickup device 73 such as a CCD, and a circuit board 74, A base plate 75 having a rectangular planar shape provided with a fixed lens on the image sensor side is provided. A lens barrel holder 76 as a lens frame for holding the lens group is supported so as to be movable up and down along a guide shaft 77, and the lens barrel holder 76 is driven up and down by a stepping motor 78 as a driving means. The output of the stepping motor 78 is transmitted from the rotor 79 to the feed screw shaft 83 via reduction gears 80 and 81 as moving means, and the lens barrel holder 76 is driven up and down. Between the base plate 75 and the cover 72, a gear receiver 84 is provided as an auxiliary base having a rectangular planar shape for independently supporting the reduction gears 80 and 81 below the stepping motor 78.

  Reference numeral 85 denotes a photo-interrupter for detecting a predetermined position (reference position) of the lens barrel holder 76, and 86 is a base plate 75 for urging the lens barrel holder 76 upward to perform backlash. A coil spring disposed between the lens barrel holders 76, a drive gear provided on the rotor 79, 88 a rotating shaft of the rotor 79, 89 a coil block of the stepping motor 78, 90 a yoke of the stepping motor 78, Reference numeral 91 denotes a gear shaft of the reduction gear 80, and reference numeral 92 denotes a filter disposed to face the image sensor 73.

  The camera module 71 will be specifically described.

  A circuit board 74 having an image sensor 73 is connected to the lower surface of the base plate 75, and a guide shaft 77 is erected on the base plate 75. A barrel holder 76 is supported on the guide shaft 77 so as to be movable up and down, and the barrel holder 76 is biased upward by a coil spring 86. A lens barrel 93 is held by the lens barrel holder 76, and the lens barrel 93 is arranged to face the image sensor 73 with a filter 92 interposed therebetween. A gear receiver 84 is disposed on the base plate 75 on the side of the lens barrel holder 76, and a stepping motor 78 is provided on the base plate 75 with the gear receiver 84 interposed therebetween.

The rotation shaft 88 of the rotor 79 of the stepping motor 78 passes through the gear receiver 84 and is supported across the cover 72 and the base plate 75, and below the stepping motor 78, the gear shaft 91 of the reduction gear 80 is connected to the gear receiver 84 and the base plate 75. And is supported.
A drive gear 87 is formed on the rotation shaft 88 of the rotor 79, and a reduction gear 80 is engaged with the drive gear 87. An output gear 94 is formed on the gear shaft 91 below the reduction gear 80, and the reduction gear 81 of the feed screw shaft 83 is engaged with the output gear 94. The upper end portion of the feed screw shaft 83 is supported by the gear receiver 84, and the nut portion 96 of the barrel holder 76 is engaged with the screw portion 95 of the feed screw shaft 83.

  That is, the driving force of the stepping motor 78 is transmitted to the feed screw shaft 83 via the rotor 79, the drive gear 87, the reduction gear 80, the output gear 94, and the reduction gear 81. The lens barrel holder 76 reciprocates along the guide shaft 77 via the nut portion 96.

  Since the gear shaft 91 of the reduction gear 80 is supported across the gear receiver 84 and the base plate 75 and the upper end portion of the feed screw shaft 83 is supported by the gear receiver 84, the gear shaft 91, The support of the feed screw shaft 83 is not restricted. For this reason, the reduction gears 80 and 81 can be arranged in an arbitrary space below the rotor 79 using the gear receiver 84, and the plane space can be reduced.

  The stepping motor 78 will be specifically described.

  The coil block 89 of the stepping motor 78 has an iron core 98 in which a yoke connecting portion 97 is integrally provided at the end of the core portion, and an exciting coil 99 wound around the core portion. The coil block 89 is a base plate 75 (case). It is arranged along one side. An end of the yoke 90 is connected to the yoke connecting portion 97, and the magnetic path portion other than the end portion is provided without overlapping the coil block 89, and the yoke 90 has a rotor through hole 70 in the magnetic path portion. A rotor 79 is disposed in the rotor through hole 70 of the yoke 90. A drive pulse is applied to the excitation coil 99, and the rotor 79 rotates at a step angle of 180 °, for example, by the magnetic pole action with the rotor 79.

  As shown in FIGS. 12 and 15, a rotor 79 is disposed at substantially the center of one side portion of the base plate 75 that is a rectangular case, and the exciting coil 99 extends along the other side portion adjacent to the one side portion. Are wound in parallel with each other. Thereby, since the shape of the yoke 90 can be made symmetric according to the coil block 89 which has the core part distribute | arranged mutually parallel, the balance of a magnetic circuit can be improved.

  In the camera module 71 described above, the gear receiver 84 is provided between the cover 72 and the base plate 75, and the gear shaft 91 including the reduction gear 80 and the feed screw shaft 83 including the reduction gear 81 are supported by the gear receiver 84. The reduction gears 80 and 81 can be arranged in an arbitrary space below the rotor 79 of the stepping motor 78, and the degree of freedom in supporting the reduction gears 80 and 81 transmitting power to the feed screw shaft 83 in the planar direction is improved. Can be made. In the module using the thin stepping motor 78 having the coil block 89, the yoke 90 and the rotor 79, the position of the rotor 79 is only controlled in relation to the shape of the yoke 90. It is possible to improve the degree of freedom in the arrangement design of the feed screw shaft 83 provided with the gear shaft 91 provided with the reduction gear 81.

  In the above-described embodiment example, a reduction gear train is arranged in the space below or above the rotor to reduce the plane space while reducing the planar space while reducing the thickness by using the thin stepping motor. Therefore, it is possible to provide a lens driving module and a camera module that can achieve both a reduction in thickness and a degree of freedom in design at a high level.

  The present invention relates to a lens driving module mounted on a portable electronic device, such as a card-type digital camera or a camera-equipped mobile phone, and used for focusing and zooming, and an industrial field of a camera module configured by including this device. Can be used.

It is a disassembled perspective view of the camera module provided with the lens drive module which concerns on the example of 1st Embodiment of this invention. It is a whole block diagram of a camera module. It is a top view of a camera module. It is the IV-IV line arrow directional view in FIG. It is a perspective view of a stepping motor. It is a disassembled perspective view of the camera module provided with the lens drive module which concerns on the example of 2nd Embodiment of this invention. It is a whole block diagram of a camera module. It is a top view of a camera module. It is the IX-IX line arrow directional view in FIG. It is a perspective view of the upper surface side of a stepping motor. It is a perspective view of the lower surface side of a stepping motor. It is a whole block diagram of the camera module provided with the lens drive module which concerns on the 3rd Example of this invention. It is a top view of a camera module. It is a XIV-XIV line arrow directional view in FIG. It is a perspective view of a stepping motor.

Explanation of symbols

1, 31, 71 Camera module 2, 32, 72 Cover 3, 33, 73 Imaging element 4, 34, 74 Circuit board 5, 35, 75 Base plate 6, 36, 76 Lens barrel holder 7, 37, 77 Guide shaft 8, 38, 78 Stepping motor 9, 39, 79 Rotor 10, 11, 40, 41, 80, 81 Reduction gear 12, 84 Gear receiver 13, 43, 85 Photo interrupter 14, 44, 86 Coil spring 15, 45, 87 Drive gear 16, 46, 89 Coil block 17, 47, 90 Yoke 18, 48, 91 Gear shaft 19, 55, 83 Feed screw shaft 20, 49 Shield portion 21, 51, 94 Output gear 22, 56, 95 Screw portion 23, 57 , 96 Nut part 25, 53, 93 Lens barrel 26, 61, 97 Yoke coupling part 27, 62, 98 Iron core 28, 63, 9 Exciting coils 29,64,70 rotor hole 42 second base 50,88 rotary shaft 92 filter

Claims (7)

The lens frame that holds the lens group is supported inside the case so that it can reciprocate in the optical axis direction.
A moving means for reciprocating the lens frame;
Drive means for moving the lens frame via the moving means;
A lens driving module comprising an auxiliary base for supporting the moving means inside the case. The lens driving module according to claim 1,
The moving means includes a feed screw member that reciprocates the lens frame, and a plurality of reduction gear members that reduce the output of the drive means and transmit the speed to the feed screw member.
At least one reduction gear member is supported on the auxiliary base. In the lens drive module according to claim 1 or 2,
The driving means is a stepping motor,
Stepping motor
A coil block disposed along one surface of the case having an iron core integrally provided with a yoke connecting portion at an end of the core portion and an exciting coil wound around the core portion;
A magnetic path portion other than the end connected to the yoke connecting portion is provided without overlapping the coil block, and the yoke having a rotor through hole in the magnetic path portion;
A lens driving module comprising: a rotor disposed in a rotor through-hole of the yoke. The lens driving module according to claim 3,
The case has a rectangular shape in plan, and a rotor is arranged at substantially the center of one side of the rectangular shape. A lens drive module characterized by being provided. The lens driving module according to claim 3,
The case has a rectangular planar shape, and a rotor is disposed at a substantially rectangular portion of the rectangular shape, and the core portion around which the exciting coil is wound extends to the adjacent sides of the rectangular shape centering on the rotor to form an L shape. A lens driving module. The lens driving module according to claim 3,
The case has a rectangular planar shape, and a rotor is arranged at substantially the center of one side of the rectangular shape, and a core portion for winding the exciting coil extends along each other side adjacent to one side of the rectangular shape. A lens driving module characterized by being arranged in parallel with each other.   A camera module comprising an imaging device in the lens driving module according to claim 1.

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