JP2011013452A - Lens driving device, camera, and cellular phone with camera - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lens driving device that prevents inclination of the optical axis of a lens support and reducing the number of parts, and to provide a camera and a cellular phone with a camera.SOLUTION: In the lens driving device 1, a spring 7 supporting the lens support 5 includes an annular outer circumferential side part 7a, at least two pairs of inner circumferential side parts 7b and 7c arranged at equal intervals in a peripheral direction on the inner circumferential side of the outer circumferential side part 7a and facing each other, and an arm part 7d connecting the inner circumferential side parts 7b and 7c and the outer circumferential side part 7a. The lens support 5 includes spring locking parts 17a and 17b in the outer circumferential surface thereof. The outer circumferential side part 7a of the spring is located between the front end 5a of the lens support 5 and its rear end 5b. At least two pairs of inner circumferential side parts 7c and 7b are locked on the lens support 5 in positions different in longitudinal direction, between the front end 5a of the lens support 5 and its rear end 5b.

Description

  The present invention relates to a lens driving device, a camera, and a mobile phone with a camera.

  In Patent Document 1, a front spring is disposed at the front end of the lens support, a rear spring is disposed at the rear end of the lens support, and the lens drive supports the lens support movably back and forth with a total of two springs. An apparatus is disclosed.

  Each spring of the front spring and the rear spring includes an annular outer peripheral side portion, an annular inner peripheral side portion provided on the inner peripheral side of the outer peripheral side portion, and an arm portion that connects the outer peripheral side portion and the inner peripheral side portion. The lens support body is sandwiched between the inner peripheral side portion of the front spring and the inner peripheral side portion of the rear spring.

JP 2005-128392 A

  However, since the lens support is supported by the two springs of the front spring and the rear spring, the optical axis of the lens support is moved back and forth due to the accuracy error of the two springs and the displacement during mounting. There is a problem that the optical axis tends to be inclined due to the deviation. There is also a demand to reduce the number of parts.

  Therefore, an object of the present invention is to provide a lens driving device, a camera, and a camera-equipped mobile phone that can prevent the inclination of the optical axis of the lens support and reduce the number of components.

  The invention according to claim 1 is an annular yoke to which a magnet is fixed, a lens support body which is disposed on the inner peripheral side of the yoke and has a coil fixed to the outer periphery thereof, a base provided on the rear side of the yoke, A lens driving device that includes a spring that movably supports the lens support relative to the base, and moves the lens support back and forth along the optical axis direction of the lens with respect to the base by electromagnetic force generated by energizing the coil The springs are naturally flat before assembly, and are arranged at equal intervals along the circumferential direction on the annular outer peripheral side portion and the inner peripheral side of the outer peripheral side portion, and at least two pairs that are opposed to each other. The lens support body has a spring locking portion for locking each inner peripheral side portion of the spring on the outer peripheral surface, and an arm portion that connects each inner peripheral side portion and the outer peripheral side portion. The outer peripheral side of the spring and the base Between the front end and the rear end of the lens support, and at least two sets of inner peripheral side portions are located between the front end and the rear end of the lens support and in the front-rear direction. It is characterized by being locked to the lens support at different positions.

  The invention according to claim 2 is the invention according to claim 1, wherein the inner peripheral side portion of one set of springs is located in front of the inner peripheral side portion of the other set, and The peripheral side portion is at the same position as the outer peripheral side portion in the front-rear direction.

  According to a third aspect of the present invention, in the second aspect of the present invention, the spring locking portions provided on the lens support are provided at intervals in the circumferential direction, and each inner peripheral side portion of the spring is a spring. The arm portion that is locked between the locking portions and connected to each inner peripheral side portion is located between the spring locking portions.

  According to a fourth aspect of the present invention, in the invention according to any one of the first to third aspects, the inner peripheral side portion of one set of springs and the inner peripheral side of the other set are formed of a lens support. The lens support is locked at a position straddling the center of gravity in the front-rear direction.

  According to a fifth aspect of the present invention, there is provided a camera comprising the lens driving device according to any one of the first to fourth aspects.

  A sixth aspect of the present invention is a camera-equipped mobile phone in which the camera according to the fifth aspect is mounted.

  According to the first aspect of the present invention, the spring has the outer peripheral side portion arranged at a position corresponding to the space between the front end and the rear end (intermediate portion) of the lens support, and the inner peripheral side portion of each set is a lens. Between the front end and the rear end (intermediate part) of the support body, the lens support body is locked at different positions in the front-rear direction, so that the lens support body can be supported by one spring, and two springs The number of parts can be reduced as compared with the conventional technique using the.

  Since the lens support is supported by one spring, compared to the case where the lens support is supported by two springs as in the prior art, the lens support of the lens support due to the accuracy error or mounting error between the two springs. The inclination of the optical axis can be prevented and the optical axis of the lens support can be easily adjusted during assembly.

  Since the plurality of inner peripheral side portions locked to the lens support are independently connected to the outer peripheral side by the arm portions, the inner peripheral side portions provided in four directions when the lens support moves in the radial direction. However, since the lens support is biased toward the center, the lens support can be prevented from being biased in the radial direction, and so-called centering can be easily performed.

  According to the second aspect of the present invention, the function and effect of the first aspect can be achieved, and the inner peripheral side portion of one set is arranged in front of the inner peripheral side portion of the other set and the other set is set. Since the inner peripheral side of the lens is located at the same position in the front-rear direction as the outer peripheral side, the lens support is pressed toward the base when the coil is not energized. It can reduce body shake.

  According to the third aspect of the invention, the effects of the first aspect can be achieved, and the arm portion of the spring can be prevented from interfering with the spring locking portion of the lens support.

  According to the invention described in claim 4, it is possible to stably support the lens support with one spring while exhibiting the operational effects described in any one of claims 1 to 3.

  According to invention of Claim 5, the camera which show | plays the effect as described in any one of Claims 1-4 can be provided.

  According to the invention described in claim 6, it is possible to provide a camera-equipped mobile phone having the function and effect described in claim 5.

(A) is the perspective view which extracts and shows the state which attached the spring to the lens support body in the lens drive device which concerns on 1st Embodiment, (b) is a perspective view which extracts and shows only the spring of (a). is there. It is a perspective view of the spring in a lens drive device before attachment (natural state). FIG. 3 is a plan view of the spring shown in FIG. 2. It is a disassembled perspective view of the lens drive device concerning this embodiment. It is AA sectional drawing shown in FIG. It is a top view of the lens drive device concerning this embodiment.

  Hereinafter, embodiments of the present invention will be described in detail with reference to FIGS. 1 to 6 of the accompanying drawings. A lens driving device 1 according to the present embodiment is a lens driving device for an autofocus camera incorporated in a mobile phone.

  As shown in FIGS. 4 and 5, the lens driving device 1 includes an annular yoke 3, a lens support 5, a spring 7, and a base 9 disposed on the rear side of the yoke 3. An insulator (spacer) 11 is disposed between the yoke 3 and the spring 7. This lens driving device 1 is very small with a length and width of about 8.5 mm and a height of about 5 mm. Although not shown, a lens is fixed on the inner periphery of the lens support 5.

  As shown in FIG. 6, the outer periphery of the yoke 3 is a rectangular in plan view when viewed from the front side, and the inner periphery is circular in a plan view, and as shown in FIG. 5, the outer peripheral wall 3a, the inner peripheral wall 3b, It consists of a connecting wall 3c that connects the outer peripheral wall 3a and the inner peripheral wall 3b, and the outer peripheral wall 3a, the inner peripheral wall 3b, and the connecting wall 3c have a U-shaped or U-shaped cross section. The inner peripheral side wall 3b is located at the corner 12 of the yoke 3, but not between the corners 12 and 12.

  At each corner 12 of the yoke 3, a magnet 13 is fixed to the inner peripheral surface of the outer peripheral wall 3a. The magnet 13 is provided only at the corner 12.

  As shown in FIGS. 4 and 5, the lens support 5 has a substantially cylindrical shape, and is provided so as to be movable in the optical axis direction (front-rear direction) on the inner peripheral side of the yoke 3. An annular coil 15 is fixed to the outer periphery of the lens support 5, and the coil 15 is disposed between one of the springs 7 between a front locking projection 19 (described later) provided integrally with the lens support 5. The inner peripheral side portion 7b (described later) of the set is sandwiched.

  The spring 7 has a flat plate-like natural state before assembly, and is arranged on the inner periphery of the outer peripheral side portion 7a and the outer peripheral side portion 7a that form an annular shape in a plan view as shown in FIGS. It is composed of four arc-shaped inner peripheral side portions 7b and 7c and respective arm portions 7d that connect the inner peripheral side portions 7b and 7c and the outer peripheral side portion 7a.

  The four inner peripheral side portions 7b and 7c are circular as a whole, and are composed of one set of inner peripheral side portions 7b and 7b facing each other and the other set of inner peripheral side portions 7c and 7c. ing. The inner peripheral side portions 7b and 7c are arranged at equal intervals and with substantially the same arc length, and in the present embodiment, are approximately ¼ length of the arc.

  The arm portion 7d has a shape bent in a plurality along the radial direction, is provided so as to be elastically deformable in the radial direction (radial direction), and is also provided to be elastically deformable in the front-rear direction (thrust direction). .

  As shown in FIGS. 2 and 3, the spring 7 is substantially flush with the outer peripheral side portion 7a, the inner peripheral side portions 7b and 7c, and the arm portion 7d in the natural state before assembly.

  In addition, terminals 33 and 35 are provided on the outer peripheral side portion 7a of the spring 7, and as shown in FIG. 3, the outer peripheral side portion 7a is divided into two parts with the terminals 33 and 35 as a boundary. The part and the other divided part are electrically connected to the coil 15. As a result, the current input from one terminal 33 is supplied to the coil 15 and flows out from the other terminal 35.

  As shown in FIGS. 1A and 4, the lens support 5 is integrally formed with four spring locking portions 17 a and 17 b provided at equal intervals in the circumferential direction. Each spring locking portion 17a, 17b is provided with a front end side locking convex portion 19 and a rear end side locking convex portion 21, and the front end side locking convex portion 19 is more than the rear end side locking convex portion 21. Further, two locking projections 19 and 21 are formed in a step shape on the front side in the optical axis direction.

  One spring latching portion 17a and the other spring latching 17b are alternately provided at equal intervals in the circumferential direction, and a total of four are provided. And the rear end side locking projection 21 of the spring locking portion 17b face each other in the circumferential direction, the front end side locking projection 19 of one spring locking portion 17a and the front end side of the other spring locking portion 17b The locking projections 19 are arranged opposite to each other in the circumferential direction.

  The inner peripheral side portion 7b of one set of the springs is disposed so as to straddle between the front side locking convex portions 19 and 19, and the inner peripheral side portion 7c of the other set is arranged on the rear side locking convex portions 21 and 21. It is arranged across.

  Further, in the present embodiment, as shown in FIGS. 1 and 5, the front side locking convex portion 19 and the rear side locking in the optical axis direction with respect to the center of gravity G of the lens support 5 in the state where the lens is housed. The convex portion 21 is located at a position sandwiching the center of gravity G, in other words, the inner peripheral side portion 7b of one set of springs and the inner peripheral side 7c of the other set in the optical axis direction of the lens support 5. The center of gravity G is relatively sandwiched between them.

  As shown in FIG. 5, the base 9 has a contacted portion 23 that contacts the rear end 5 b of the lens support 5 on the bottom surface, and a spring on which the outer peripheral side portion 7 a of the spring 7 is placed in the middle portion in the front-rear direction. A placement portion 25 is formed.

  The abutted portion 23 is a lens support that is pressed backward by the inner peripheral side portion 7b of one set of the spring 7 when the lens support 5 is in an initial position (a position when the coil is not energized). 5 abuts against the rear end 5b.

  The spring mounting portion 25 mounts the outer peripheral side portion 7 a of the spring 7 and sandwiches the outer peripheral side portion 7 a of the spring with the spacer 11. The spring placement portion 25 is located between the front end 5 a and the rear end 5 b of the lens support 5 and is located slightly behind the center of gravity G.

  Next, assembly, operation, and effects of the lens driving device 1 according to the embodiment of the present invention will be described. As shown in FIGS. 4 and 5, the lens driving device 1 is assembled by assembling the base 9 with the lens support 5 with the spring 7 and the coil 15 fixed, the spacer 11 and the yoke 3 with the magnet 13 fixed therein. The outer peripheral side portion 7a of the spring 7 is placed on the spring mounting portion 25 of the base 9 and sandwiched between the spacers 11, and one set of the spring 7 is placed on the front side locking convex portion 19 provided on the outer peripheral surface of the lens support 5. The inner peripheral side portion 7b is locked from the front side, and the other set of inner peripheral side portion 7c is locked to the rear side locking convex portion 21 from the front side.

  The lens driving device 1 according to the present embodiment is driven by the electromagnetic force acting on the coil 15 when the coil 15 is energized from the terminals 33 and 35 provided on the spring 7, and the lens support 5 has the arm portion 7 d of the spring 7. It moves to the front against the elastic force and stops at a position where the elastic force and the electromagnetic force of the arm portion 7d of the spring 7 are balanced.

  According to the present embodiment, the spring 7 has its outer peripheral side portion 7a arranged at a position corresponding to the space between the front end and the rear end (intermediate portion) of the lens support 5, and one set of inner peripheral side portions. 7b, 7b and the other set of inner peripheral side portions 7c, 7c are locked to the lens support at different positions in the front-rear direction between the front end and the rear end (intermediate portion) of the lens support 5. Therefore, the lens support 5 can be supported by one spring 7, and the number of parts can be reduced as compared with the conventional technique using two springs.

  Since the lens support 5 is supported by one spring 7, the lens support based on the accuracy error and the mounting error of the two springs is compared with the case where the lens support is supported by two springs as in the prior art. The inclination of the optical axis of the body can be prevented, and the optical axis of the lens support 5 can be easily adjusted during assembly.

  In the spring 7 locked to the lens support 5, the plurality of inner peripheral side portions 7 b and 7 c are independently connected to the outer peripheral side portion by the arm portions 7 d, so that the lens support 5 moves in the radial direction Since the inner peripheral side portions 7b and 7c provided on the four sides respectively bias the lens support 5 toward the center, it is possible to prevent the lens support 5 from being biased in the radial direction and to center the lens support 5. Easy to do.

  In the spring 7, the inner peripheral side portions 7c, 7c of the other set are in the same position in the front-rear direction as the outer peripheral side portion 7a, and the inner peripheral side portions 7b, 7b of one set are connected to the inner peripheral side portion 7c of the other set. 7c, the lens support 5 is brought into contact with the base 9 by being biased toward the base 9, so that the lens driving device 1 is not driven (the coil 15 is not energized). In this case, the vibration of the lens support 5 against an external force such as dropping or vibration can be reduced.

  The spring engaging portions 17a and 17b provided on the lens support 5 are provided at intervals in the circumferential direction, and the inner peripheral side portions 7b and 7c of the spring 7 straddle between the spring engaging portions 17a and 17b. Since the arm portion 7d that is locked and connected to the inner peripheral side portions 7b and 7c is located between the spring locking portions 17a and 17b, the arm portion 7d of the spring 7 is the spring locking portions 17a and 17b. Can be prevented from interfering with.

  The inner peripheral side portion 7b of one set of the spring 7 and the inner peripheral side 7c of the other set support the lens support 5 at a position where the center of gravity G in the optical axis direction of the lens support 5 is relatively sandwiched. Therefore, the lens support 5 can be stably supported by the single spring 7.

  The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the present invention.

  For example, the outer peripheral side portion 7a of the spring 7 is not limited to a rectangular shape in plan view, but may be a circle or a polygon such as a hexagon, and the shape is not limited. In addition, the inner peripheral side portions 7a and 7b of the spring 7 are provided with two pairs as a pair. However, the present invention is not limited thereto, and for example, three sets may be provided as long as two or more sets are provided.

  Two springs having the same shape may be used as one spring.

DESCRIPTION OF SYMBOLS 1 Lens drive device 3 Yoke 5 Lens support body 7 Spring 7a Outer peripheral side part 7b Inner peripheral side part 7c of one group 7d Arm part 9 Base 13 Magnet 15 Coil 17a Spring latching part 17b Spring Locking portion 19 Front locking projection 21 Rear locking projection G Center of gravity

Claims (6)

An annular yoke with a magnet fixed to it, a lens support disposed on the inner periphery of the yoke and a coil fixed to the outer periphery, a base provided on the rear side of the yoke, and the lens support moved relative to the base A lens driving device that includes a spring that freely supports and moves the lens support body back and forth along the optical axis direction of the lens with respect to the base by electromagnetic force generated by energizing the coil.
The springs are naturally flat before assembly, and are arranged at equal intervals along the circumferential direction on the outer peripheral side of the ring and the inner peripheral side of the outer peripheral side, and at least two pairs that are opposed to each other. The lens support has an inner peripheral side part and an arm part connecting the inner peripheral side part and the outer peripheral side part, and the lens support has a spring locking part for locking each inner peripheral side part of the spring on the outer peripheral surface. The outer peripheral side portion of the spring is sandwiched between the base and the yoke and is located between the front end and the rear end of the lens support, and at least two sets of inner peripheral side portions are connected to the front end of the lens support. A lens driving device, wherein the lens driving device is locked to a lens support at a position different from the rear end in the front-rear direction.   The inner peripheral side portion of one set of springs is located in front of the inner peripheral side portion of the other set, and the inner peripheral side portion of the other set is in the same position in the front-rear direction as the outer peripheral side portion. The lens driving device according to claim 1.   The spring engaging portions provided on the lens support are provided at intervals in the circumferential direction, and the inner peripheral side portions of the spring are straddled across the spring engaging portions and the inner peripheral side portions. The lens driving device according to claim 2, wherein the arm portion connected to the spring is positioned between the spring locking portions.   The inner peripheral side of one set of springs and the inner peripheral side of the other set are locked to the lens support at a position across the center of gravity in the front-rear direction of the lens support. The lens drive device as described in any one of 1-3.   A camera comprising the lens driving device according to claim 1.   A camera-equipped mobile phone, comprising the camera according to claim 5.

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