JP2009086158A - Lens drive device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lens drive device, preventing reduction in performance of the lens drive device. <P>SOLUTION: The device comprises a mobile body 17 movable in an optical axial direction while holding a lens, and a support (holder 19, etc.) for supporting the mobile body 17. One of the mobile body 17 and the support includes abutting parts 31a-31d for regulating the movement of the mobile body 17 in the optical axial direction by abutment on a telescopic end side and a macro end side, and the other includes abutted parts 31a'-31d' in contact with the abutting parts 31a-31d, and the abutting parts 31a-31d and the abutted parts 31a'-31d' have different hardnesses. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a lens driving device that forms an image of a subject by driving a lens in the direction of an optical axis.

  In recent years, as camera-equipped mobile phones equipped with cameras have become popular, opportunities for photographing various subjects using the mobile phones have increased. For example, you can shoot a subject that is far away from the camera lens, such as a friend or landscape (normal shooting), or a subject that is close to the camera lens, such as a bus timetable or petals (close-up shooting) There is a case.

  In close-up photography (macro photography), the lens position of the camera needs to be slightly closer to the subject side than the lens position during normal photography. Therefore, this type of photographic lens system includes a magnetic drive mechanism that drives the lens to be displaced in the optical axis direction, and the lens can be moved in the optical axis direction by driving the magnetic drive mechanism by switching a switch. It is like that.

  For example, a movable body provided with a lens, a fixed body that supports the movable body so as to be movable in the optical axis direction via two leaf springs arranged at two positions separated in the optical axis direction, a coil, and a magnet Therefore, a lens driving device having a magnetic driving mechanism for driving the moving body in the optical axis direction has been proposed. Further, a lens driving device has been proposed in which two coil end portions drawn from a coil are connected to two leaf springs, respectively, and power is supplied to the coil via the two leaf springs (Patent Literature). 1 and 2). In addition, from the viewpoint of facilitating the manufacturing process, the same or similar resin member is used for the moving body and the fixed body in any lens driving device.

JP 2005-128392 A JP 2006-201525 A

  However, when an external impact or vibration is applied to the lens driving device (for example, when a mobile phone equipped with the lens driving device is dropped), the movable body made of resin material and the fixed body made of resin material come into contact with each other. As a result, abrasion powder or the like may be generated from the surface of the resin material. If the generated abrasion powder or the like falls on the IR cut filter, the image becomes unclear and the performance of the lens driving device is degraded.

  The present invention has been made in view of the above points, and an object of the present invention is to provide a lens driving device capable of preventing performance degradation such as an image becoming unclear.

  In order to solve the above problems, the present invention provides the following.

  (1) A movable body that holds the lens and is movable in the optical axis direction, and a support body that supports the movable body, and either the movable body or the support body includes a telephoto end side, A contact portion that contacts at the close-up end side and restricts movement of the moving body in the optical axis direction is provided, and on the other side, a contacted portion that contacts the contact portion is provided, and the contact portion A lens driving device having a hardness different from that of the contacted portion.

  According to the present invention, either the moving body or the support body is provided with a contact portion that contacts the telephoto end side and the close-up end side to regulate the distance of the moving body in the optical axis direction, and the other is provided Since the abutted portions that abut the abutting portions are provided, and the abutting portions and the abutted portions have different hardness, even if the moving body and the support are the same or similar materials, It is possible to prevent wear powder and the like from falling off from the contact portion or the contacted portion that actually contacts.

  Accordingly, it is possible to prevent the image from becoming unclear due to the falling off of wear powder or the like, and to prevent the performance of the lens driving device from being deteriorated. It should be noted that the wear powder generated when the movable body made of the material and the support come into contact with each other, and the wear powder generated when the contact portion and the contacted portion with different hardness as in the present invention come into contact with each other. Etc. are different in size and quantity. That is, the latter has a smaller size of the wear powder and the like, and the amount of the wear powder is also small. In this respect, even if the wear powder or the like cannot be eliminated to zero, it is possible to prevent performance degradation as compared with the conventional lens driving device.

  (2) The lens driving device, wherein either one of the contact portion and the contacted portion is plated with metal.

  According to the present invention, either one of the abutting portion and the abutted portion described above is plated with metal, so that the hardness of the abutting portion and the abutted portion is achieved by this plating. Can be different. Therefore, the hardness of the contact portion and the contacted portion can be made different by a simple work process, and as a result, the performance of the lens driving device can be prevented from being lowered while improving the workability.

  (3) The moving body is formed with an extended portion projecting in a radial direction to restrict the rotation of the moving body, and either the abutting portion or the abutted portion is A lens driving device provided in the extension portion.

  According to the present invention, the above-described moving body is formed with an extending portion that protrudes in the radial direction in order to restrict the rotation of the moving body. Since either the contact part or the contacted part is provided in the extension part, the extension part has a function for restricting the movement of the mobile body (in the optical axis direction) and the mobile body. It is possible to have both functions of restricting the rotation of the lens, and to prevent the performance of the lens driving device from being deteriorated.

  (4) A lens in which one of the moving body and the support is provided with a positioning portion having a height different from that of the contact portion and the contacted portion in the optical axis direction. Drive device.

  According to the present invention, either one of the moving body and the support described above is provided with a positioning portion having a height different from the contact portion and the contacted portion in the optical axis direction. The optical axis direction of the moving body can be prevented from deviating from the normal state (the optical axis of the moving body is tilted), and the performance of the lens driving device can be prevented from deteriorating.

  That is, for example, when the positioning part is lower in the optical axis direction than the contact part and the contacted part (the projection amount from the plane is small), the positioning part moves by the contact part and the contacted part. After the movement of the body in the optical axis direction is restricted, the optical axis of the moving body can be prevented from being inclined by the positioning unit. As a result, it is possible to prevent the performance of the lens driving device from deteriorating.

  (5) The lens driving device, wherein the plating is applied to an edge portion of the contact portion or the contacted portion.

  According to the present invention, since the plating described above is applied to the edge portion of the contact portion or the contacted portion, the wear powder or the like can be obtained by varying the hardness of the portion where the wear powder is most likely to come out. Can be efficiently suppressed. In the present invention, at least the edge portion may be plated, and other portions may or may not be applied.

  According to the lens driving device of the present invention, it is possible to prevent blurring of an image due to falling off of wear powder and the like, and to prevent performance degradation such as image quality. In particular, even if abrasion powder or the like is generated due to contact between the abutting portion and the abutted portion, the amount of the abrasion powder or the like is smaller than that in the conventional case, which can contribute to prevention of performance degradation of the lens driving device.

  The best mode for carrying out the present invention will be described below with reference to the drawings.

[Machine configuration]
FIG. 1 is a perspective view showing an external configuration of a lens driving device 1 according to an embodiment of the present invention. FIG. 2 is an exploded perspective view showing a mechanical configuration of the lens driving device 1 according to the embodiment of the present invention.

  1 and 2, the lens driving device 1 includes a cap 11, a plate cover 12, a yoke 13, a magnet 14, a first plate spring 15, a wire spring 16 as a magnetic member, and a moving body. 17, a second leaf spring 18, a holder 19, and a terminal 20. For convenience of explanation, a cylindrical lens holder that includes one or a plurality of lenses and is held inside the moving body 17 is not shown. The lens driving device 1 also moves the moving body 17 in the A direction (front side, close-up end side) approaching the subject (imaging target) along the optical axis L direction, and on the side opposite to the subject (image side, telephoto end). It is moved in both directions in the B direction (rear side) approaching the side.

  The cap 11, the plate cover 12, the yoke 13, and the holder 19 support the movable body 17 so as to be movable in the optical axis direction via the first plate spring 15 and the second plate spring 18. Functions as an example of a “support”. Moreover, in this embodiment, the outer periphery shape of a support body is substantially rectangular.

  The cap 11 covers the subject side of the plate-like cover 12, and circular incident windows 110 and 120 for taking reflected light from the subject into the lens are respectively provided in the center of the cap 11 and the plate-like cover 12. Is formed. The yoke 13 is sandwiched between the plate-like cover 12 and the holder 19 and is made of a ferromagnetic plate such as a steel plate and has a rectangular tube shape. Further, the yoke 13 is exposed on the side surface of the lens driving device 1 and constitutes a side surface portion thereof, and has a function as a case body that covers the side surface of the moving body. The holder 19 holds an image sensor (not shown) on the image side.

  The moving body 17 includes a sleeve 170, a first coil 171, and a second coil 172. The first coil 171 and the second coil 172 are arranged on the outer peripheral surface of the sleeve 170 in two stages in the direction of the optical axis L, and the shape of the moving body 17 is cylindrical. The movable body 17 is accommodated in the inner periphery of the yoke 13 constituting the support, and spaces are formed at four corners of the inner peripheral surface of the yoke 13 due to the difference in shape. . Therefore, the magnet 14 faces the first coil 171 and the second coil 172 on the outer peripheral side, and is fixed to four corners on the inner peripheral surface of the yoke 13.

  The magnet 14 is composed of eight magnet pieces, and in any magnet piece, the inner surface and the outer surface are magnetized to different poles. In addition, in the front and rear magnets, for example, in the front (A direction) magnet, the inner surface is magnetized to the N pole, the outer surface is magnetized to the S pole, and in the rear (B direction) magnet, The inner surface is magnetized to the S pole and the outer surface is magnetized to the N pole. Further, the front magnet is arranged to face the first coil 171, and the rear magnet is arranged to face the second coil 172.

  The first plate spring 15 and the second plate spring 18 are attached between the support body and the moving body 17 and act so as to urge the movement of the moving body 17 in the optical axis direction. . The first leaf spring 15 is held by fixing an arcuate attachment portion on the surface of the moving body 17 in the A direction, and fixing the support portion (end portion) on the support side to the plate cover 12. Yes. Further, the first leaf spring 15 is formed with an arm portion having a spring property for connecting these two attachment portions. Further, as will be described in detail later, the second leaf spring 18 has an arcuate fixing portion fixed to the surface of the moving body 17 in the B direction, and a mounting portion (end portion) on the support side fixed to the holder 19. Is held by. Further, the first leaf spring 15 is formed with an arm portion having a spring property for connecting these two attachment portions. In the present embodiment, the first plate spring 15 and the second plate spring 18 are both formed of a metal thin plate, and have the same thickness in the optical axis L direction. Thereby, productivity can be improved.

  The yoke 13 is larger than the dimension in the optical axis L direction of the region where the first coil 171 and the second coil 172 are disposed, and the dimension of the magnet 14 in the optical axis L direction. Leakage magnetic flux from the magnetic path configured between the first coil 171 and the magnetic path configured between the magnet 14 and the second coil 172 can be reduced. As a result, it is possible to contribute to an improvement in linearity between the amount of movement of the sleeve 170 and the current flowing through the first coil 171 and the second coil 172.

  The annular wire spring 16 is held by the sleeve 170. The wire spring 16 applies a biasing force in the direction of the optical axis L to the moving body 17 by a magnetic attractive force acting between the wire 14 and the magnet 14. For this reason, it is possible to prevent the moving body 17 from being displaced by its own weight when the first coil 171 and the second coil 172 are not energized, and as a result, the moving body 17 can be maintained in a desired posture. . The wire spring 16 is disposed on the subject-side (front-side) end surface of the moving body 17 and is disposed so as to be interposed between the moving body 17 and the first leaf spring 15.

  The yoke 13 has a substantially rectangular outer peripheral shape, and the pair of opposing side surface portions 131 are formed in a flat shape, and the other pair of opposing side surface portions 132 have both end portions 133 recessed inward, A convex portion 134 that protrudes outward in a step shape is formed at the center. Therefore, when viewed from the direction of the optical axis L, the first leaf spring 15 and the second leaf spring 18 are arranged in the rectangular region surrounded by the side surface portion 131 and both end portions 133 of the side surface portion 132 in the yoke 13. It is a space that can be made.

  The plate-like cover 12 covers the subject side of the yoke 13 and has a plate part 121 in which an incident window 120 is formed at the center. At the four corners of the plate portion 121, a convex portion 122 extending toward the subject side and a convex portion 123 extending toward the imaging element side are formed, and a pair of opposing sides of the plate portion 121 is formed on the upper surface of the plate portion 121 with the cap 11. A holding portion 124 that holds the circumferential direction of the engaging portion is formed. Further, the holder 19 is formed with convex portions 192 at the four corners extending toward the subject side, and columnar members 191 extend from the side surface toward the subject side. A fixing portion of the second leaf spring 18 is fixed to the convex portion 192 of the holder 19. Similarly, a fixing portion of the first leaf spring 15 is fixed to the convex portion 123 of the plate-like cover 12.

  The cap 11 is formed of a non-magnetic thin plate (for example, SUS304), and covers the subject side of the plate cover 12, and has a top plate portion 111 in which an incident window 110 is formed at the center. Although the top plate portion 111 has a substantially rectangular shape, rectangular cutouts 112 and 113 are formed in the four corners and in the vicinity of the center of the opposite side, respectively. In the pair of opposing side portions of the top plate portion 111, a pair of engagement leg portions 114 respectively extend downward from the vicinity of both ends sandwiching the notch 113. A through hole 115 is formed in the engaging leg 114 near the center region.

  With the configuration as described above, when the cap 11 is overlapped with the holder 19, the first leaf spring 15, the second leaf spring 18, and the plate cover 12 being overlapped, the holding portion 124 of the plate cover 12 is placed on the holding portion 124. The cap 11 is arranged on the upper surface of the plate-like cover 12 by fitting the notch 113 of the cap 11. At that time, convex portions 122 formed at the four corners of the plate-like cover 12 are arranged in the notches 112 formed at the four corners of the top plate portion 111. Further, the engaging leg portion 114 is disposed so as to abut on the side surface portion 133 of the yoke 13 and sandwich the convex portion 134. In the engaging leg 114 arranged in this way, for example, the side surface 132 and the engaging leg 114 are fixed by applying an adhesive from the through hole 115. The cap 11 can be fixed to the yoke 13 by joining the side surface portion 132 and the engagement leg portion 114 by laser welding.

  Here, the holder 19 of the lens driving device 1 according to the present embodiment is provided with contact portions 31a to 31d that abut on the close-up end side and restrict the movement of the moving body 17 in the optical axis direction. Are provided with contacted portions 31a ′ to 31d ′ (see FIGS. 3 and 4) that contact the contact portions 31a to 31d. Hereinafter, the contact portions 31a to 31d and the contacted portions 31a ′ to 31d ′ will be described in detail with reference to FIGS.

[Abutting part and contacted part]
FIG. 3 is an external view when paying attention to the holder 19. FIG. 3 (a) shows the holder 19 when the second leaf spring 18 is attached, and FIG. The holder 19 is shown when the second leaf spring 18 is not attached. In FIG. 3, the holder 19 is viewed from the subject side (from the front side toward the rear side).

  In FIG. 3A, the second leaf spring 18 is composed of two electrically separated spring pieces 18a and 18b. The spring piece 18a (18b) includes two fixing portions 185a and 185b (186a and 186b) held (fixed) by the holder 19, and an arcuate mounting portion 187a (187b) attached to the rear end portion of the sleeve 170. And two arm portions 188a and 188b (189a and 189b) for connecting the fixing portions 185a and 185b (186a and 186b) and the mounting portion 187a (187b). Further, the four fixed portions 185a and 185b (186a and 186b) of the spring pieces 18a and 18b are held by the holder 19, and the arm portions 188a and 188b (189a and 189b) move in the optical axis L direction of the movable body 17. Is mounted on the surface of the holder 19 so as to be displaceable.

  Further, terminals 181 and 182 are formed on each of the spring pieces 18a and 18b. Terminals 181 and 182 are in contact with terminals 201 and 202 (see FIG. 2), respectively. Therefore, if the coil winding start portions and winding end portions of the coils (first coil 171 and second coil 172) are electrically connected to the coil winding portions 183 and 184 of the spring pieces 18a and 18b, respectively. Power can be supplied through the terminals 181 and 182. That is, in this embodiment, the inner surfaces of the four magnets 14 arranged on the front side are magnetized to the N pole, and the inner surfaces of the four magnets 14 arranged on the rear side are magnetized to the S pole. The winding directions of the first coil 171 and the second coil 172 wound around 170 are opposite to each other. Thereby, when current is supplied to the coils (the first coil 171 and the second coil 172), the generated force (thrust) is in the same direction.

  Specifically, the second coil 172 is wound on the outer peripheral surface of the sleeve 170 a predetermined number of turns, and the first coil 171 is arranged in a winding direction of the second coil 172 at a predetermined interval. Is wound a predetermined number of turns in the reverse direction. Thereafter, the second leaf spring 18 is placed and fixed on the end portion of the sleeve 170, and the coil winding start end portion of the second coil 172 is wound around and soldered to the coil winding portion 183 of the spring piece 18a. The Next, the winding end portion of the first coil 171 is wound around the coil winding portion 184 of the spring piece 18b and soldered.

  Next, in FIGS. 3A and 3B, the holder 19 is formed with a protrusion 193a and a protrusion 193b extending toward the subject side so as to sandwich the coil winding portion 183 described above. Further, a protrusion 193c and a protrusion 193d extending toward the subject are formed so as to sandwich the coil winding portion 184 described above. That is, the protrusions 193a and 193b and the protrusions 193c and 193d are disposed at positions that are symmetric with respect to the optical axis L. In particular, as shown by the oblique lines in FIGS. 3A and 3B, the front end surfaces of the protrusions 193a to 193d are plated with metal. In the vicinity of the coil winding portions 183 and 184, a groove portion 194 is formed as a relief portion for winding the coil.

  Further, the holder 19 is formed with recesses 195a to 195f into which a cylindrical protrusion 173 (see FIG. 4 described later) on the rear end side of the sleeve 170 is inserted (FIG. 3B), and the recesses 195b and 195c An inclination preventing part 196a is formed between them, and an inclination preventing part 196b is formed between the recesses 195d and 195e, respectively.

  The inclination prevention part 196a has a lower height (projection amount) in the direction of the optical axis L than the above-described protrusions 193a to 193d, and the inclination prevention part 196b similarly has the above-described protrusions 193a to 193d. In the direction of the optical axis L, the height (projection amount) is low. In particular, as indicated by the hatched lines in FIGS. 3A and 3B, the front end surfaces of the tilt preventing portion 196a and the tilt preventing portion 196b are subjected to metal plating. In addition, tilt preventing portions 196a and 196b are formed in a direction substantially orthogonal to the protruding portions 193a to 193d.

  On the other hand, FIG. 4 is an external view when paying attention to the sleeve 170. FIG. 4A shows the sleeve 170 when the second leaf spring 18 is attached, and FIG. The sleeve 170 when the 2nd leaf | plate spring 18 is not attached is shown.

  4 (a) and 4 (b), six cylindrical protrusions 173 described above are formed at the rear end of the sleeve 170. FIG. The second plate spring 18 is attached to the sleeve 170 by these cylindrical protrusions 173.

  In addition, the sleeve 170 is formed with expansion portions 174a to 174d protruding in the radial direction in order to restrict the rotation thereof. The rear end surfaces of these extended portions 174a to 174d are in contact with the front end surfaces of the protrusions 193a to 193d described above. At this time, as described above, since the metal plating is applied to the front end surfaces of the protrusions 193a to 193d, even if they contact due to the difference in hardness, wear powder or the like is hardly generated. That is, by applying metal plating to the front end surfaces of the protrusions 193a to 193d, the hardness thereof is harder than the hardness of the rear end surfaces of the extended portions 174a to 174d.

  As described above, in the lens driving device 1 according to this embodiment, the front end surfaces of the protrusions 193a to 193d formed on the holder 19 function as the contact portions 31a to 31d and the extension portions formed on the sleeve 170. The rear end surfaces of 174a to 174d function as contacted portions 31a ′ to 31d ′ that contact the contact portions 31a to 31d.

  4A, on the rear end surface of the sleeve 170, oval projections 175a and 175b are formed between the spring pieces 18a and the spring pieces 18b. When the optical axis L of the sleeve 170 is inclined, these oval protrusions 175a and 175b are in contact with the front end surfaces of the inclination preventing portions 196a and 196b described above.

  Therefore, the front end surfaces of the inclination preventing portions 196a and 196b having different heights in the direction of the contact portions 31a to 31d and the optical axis L function as the positioning portions 31e and 31f, and the rear end surfaces of the oval projections 175a and 175b are , Function as positioned portions 31e ', 31f'.

  In addition, as described above, in the present embodiment, metal plating is also applied to the front end surfaces of the inclination preventing portions 196a and 196b (see FIG. 3). Therefore, it has a structure in which abrasion powder or the like is hardly generated from the positioning portions 31e and 31f and the positioned portions 31e ′ and 31f ′ due to the difference in hardness. In the present embodiment, the front end surfaces of the inclination preventing portions 196a and 196b subjected to metal plating are harder than the rear end surfaces of the oval projections 175a and 175b.

  The metal plating applied to the contact portions 31a to 31d and the positioning portions 31e and 31f of the holder 19 is preferably made of a nonmagnetic material, for example, electroless nickel plating.

[basic action]
In the lens driving device 1 according to the present embodiment, the moving body 17 is normally positioned on the image sensor side (image side) (when the first coil 171 and the second coil 172 are not energized). Specifically, the lower end surface (image side surface) of the sleeve 170 is in contact with the upper surface (front side surface) of the holder 19.

  The wire spring 16 regulates the displacement of the moving body 17 by a magnetic attractive force acting between the magnet 14 and the wire spring 16. However, since the distance between the wire spring 16 and the magnet 14 is maintained to some extent, the magnetic attractive force between the wire spring 16 and the magnet 14 does not become too strong. As a result, it is possible to prevent the center axis of the moving body 17 from being displaced, and thus to prevent the tilt characteristics from deteriorating.

  In such a state, when a current in a predetermined direction is passed through the first coil 171 and the second coil 172, the first coil 171 and the second coil 172 receive an upward (front) electromagnetic force, respectively. become. Thereby, the sleeve 170 to which the first coil 171 and the second coil 172 are fixed starts to move toward the subject side (front side). At this time, elastic forces that restrict the movement of the sleeve 170 are generated between the first leaf spring 15 and the rear end of the sleeve 170 and between the second leaf spring 18 and the front end of the sleeve 170, respectively. . Therefore, when the elastic force that restricts the movement of the sleeve 170 and the sum of the magnetic attractive forces of the wire spring 16 and the magnet 14 are balanced against the electromagnetic force that moves the sleeve 170 forward, the sleeve 170 is Stop.

  Next, when a reverse current is passed through the first coil 171 and the second coil 172, the first coil 171 and the second coil 172 receive a downward (rear) electromagnetic force, respectively. . As a result, the sleeve 170 starts to move to the image sensor side (rear side). At this time, elastic forces that restrict the movement of the sleeve 170 are generated between the first leaf spring 15 and the rear end of the sleeve 170 and between the second leaf spring 18 and the front end of the sleeve 170, respectively. . The rear end surfaces of the expanded portions 174 a to 174 d of the sleeve 170, that is, the contacted portions 31 a ′ to 31 d ′ contact the contact portions 31 a to 31 d of the holder 19 (front end surfaces of the projecting portions 193 a to 193 d). After the contact, the current supply to the first coil 171 and the second coil 172 is cut off, and the lens driving device 1 is in a normal state.

  Thus, when the sleeve 170 is moved to the image sensor side, the non-contact portions 31 a ′ to 31 d ′ are in contact with the contact portions 31 a to 31 d of the holder 19 (the front end surfaces of the projections 193 a to 193 d). Since the hardness of the contact surface is different, the generation of wear powder and the like is reduced as compared with the conventional case.

  When the sleeve 170 as a moving body moves, the amount of current flowing through the first coil 171 and the second coil 172 and the elastic force acting on the sleeve 170 by the first leaf spring 15 and the second leaf spring 18 are adjusted. As a result, the sleeve 170 (the moving body 17) can be stopped at a desired position.

  In addition, by utilizing the urging force of the wire spring 16 and the magnet 14 held by the moving body 17, it is possible to reduce the size of the magnetic drive mechanism that causes the moving body 17 to generate a propulsive force in the optical axis direction. Further, by stopping the sleeve 170 using a balance between electromagnetic force and elastic force, it is possible to prevent the occurrence of collision noise.

[Effects of embodiment, etc.]
As described above, according to the lens driving device 1 according to the present embodiment, as described with reference to FIGS. 3 and 4, the contact portions formed on the front end surfaces of the expansion portions 174 a to 174 d of the sleeve 170. Since 31a to 31d are plated with metal, the hardness differs between the contact portions 31a to 31d and the contacted portions 31a 'to 31d' with which they contact. Therefore, even if the sleeve 170 and the holder 19 are made of the same or similar material, the contact portions 31a to 31d and the contact portions 31a ′ to 31d ′ having different hardnesses are in contact with each other, so that wear powder or the like (Even if wear powder or the like is generated, the amount is small and small), and as a result, it is possible to prevent performance deterioration such as an image becoming unclear and improve the reliability as a lens driving device.

  In particular, in the present embodiment, the expansion portions 174a to 174d are provided with a function for restricting the rotation of the sleeve 170 and a function as the contact portions 31a to 31d.

  Moreover, workability | operativity can be improved by using metal plating in making the hardness of contact part 31a-31d and to-be-contacted part 31a'-31d 'differ.

  Further, the positioning portions 31e and 31f are different in height from the contact portions 31a to 31d in the direction of the optical axis L. Therefore, when the direction of the optical axis L of the sleeve 170 is shifted from the normal state, the positioned portions 31e ′ and 31f ′ formed on the rear end side of the sleeve 170 abut on the positioning portions 31e and 31f, and more It can be prevented from shifting. In particular, in this embodiment, since the positioning portions 31e and 31f are also plated with metal, the generation of wear powder and the like when the positioning portions 31e and 31f and the positioned portions 31e ′ and 31f ′ come into contact with each other is suppressed. be able to.

  In addition, metal plating is applied to the edge portions of the contact portions 31a to 31d and the positioning portions 31e and 31f (the corner portions of the projection portions 193a to 193d and the corner portions of the tilt prevention portions 196a and 196b), thereby causing wear powder and the like. Generation can be efficiently suppressed. For example, metal plating may be performed only on these edge portions. Further, depending on the material and thickness of the metal plating, a buffering effect can be expected.

[Modification]
In the embodiment described above, the positioning portions 31e and 31f are also metal-plated, but only the contact portions 31a to 31d may be metal-plated. In addition, not all of the contact portions 31a to 31d may be metal plated.

  In the above-described embodiment, the contact portions 31a to 31d and the positioning portions 31e and 31f are metal-plated, and the contacted portions 31a ′ to 31d ′ and the positioned portions 31e ′ and 31f ′ are not metal-plated. However, both of them may be metal-plated (in this case, it is necessary to change the hardness by changing the material and thickness of the metal plating), or vice versa.

  FIG. 5 is a diagram illustrating a state in which metal plating is performed on the contacted portions 31a ′ to 31d ′ and the positioned portions 31e ′ and 31f ′. Further, the hardness of the contact portions 31a to 31d and the contacted portions 31a ′ to 31d ′ (or the positioning portions 31e and 31f and the positioned portions 31e ′ and 31f ′) may be made different by a method other than metal plating. .

  For example, a metal member may be insert-molded in either the moving body 17 formed of a resin material or the holder 19 formed of a resin material, and the metal member and the resin of the counterpart component may be in contact with each other. Moreover, it is good also as a structure which attaches a metal member to either the mobile body 17 and the holder 19, or both, and the resin of the other party component contacts the metal member. Furthermore, the metal member may be subjected to metal plating with a lens driving device having these structures. Furthermore, the holder 19 or the moving body 17 may be made of a metal material instead of a resin material.

  Further, a resin coating made of, for example, an inorganic material may be applied to either of the locations where the moving body 17 and the support come into contact. Thereby, abrasion resistance can be improved.

  Furthermore, although the moving body 17 and the holder 19 have been described in the present embodiment, the moving body 17 and the plate-like cover 12 may similarly form the contact portion and the contacted portion.

  The lens driving device 1 can be attached to various electronic devices other than the camera-equipped mobile phone. For example, PHS, PDA, bar code reader, thin digital camera, surveillance camera, vehicle rear view confirmation camera, door with optical authentication function, and the like.

  The lens driving device according to the present invention is useful as a device capable of preventing the wear powder and the like from dropping off from the moving body and the support and degrading the image quality performance, and thus improving the reliability of the device.

It is a perspective view which shows the external appearance structure of the lens drive device which concerns on embodiment of this invention. It is a disassembled perspective view which shows the machine structure of the lens drive device which concerns on embodiment of this invention. It is an external view when paying attention to a holder. It is an external view when paying attention to a sleeve. It is a figure which shows the mode at the time of metal-plating to the to-be-contacted part and the to-be-positioned part side.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Lens drive device 11 Cap 12 Plate-shaped cover 13 Yoke 14 Magnet 15 1st leaf | plate spring 16 Wire spring 17 Moving body 18 2nd leaf | plate spring 19 Holder 20 Terminal 31a-31d Contact part 31e, 31f Positioning part 31a'- 31d 'contacted part 31e', 31f 'positioned part

Claims (5)

A movable body that holds the lens and is movable in the optical axis direction;
A support for supporting the moving body,
One of the moving body and the support body is provided with a contact portion that contacts the telephoto end side and the close-up end side to restrict the movement of the moving body in the optical axis direction, and the other is the contact section. A contacted part that contacts the contact part is provided;
The lens driving device characterized in that the contact portion and the contacted portion have different hardnesses.   2. The lens driving device according to claim 1, wherein either one of the contact portion and the contacted portion is plated with metal. The moving body is formed with an extended portion projecting in the radial direction in order to restrict the rotation of the moving body,
The lens driving device according to claim 1, wherein one of the contact portion and the contacted portion is provided in the extension portion.   The positioning portion having a height different from that of the contact portion and the contacted portion in the optical axis direction is provided on one of the movable body and the support body. 4. The lens driving device according to any one of 3.   5. The lens driving device according to claim 2, wherein the plating is applied to an edge portion of the contact portion or the contacted portion.

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