JP5936177B2 - Lens drive device, autofocus camera and mobile terminal with camera - Google Patents

Description

The present invention relates to a lens driving device, an autofocus camera, and a mobile terminal with a camera.
A mobile terminal means a mobile phone, a personal digital assistant (PDA), a notebook computer, or the like.

  Patent Document 1 discloses a yoke, a base on which the yoke is mounted, a frame in which the yoke is disposed between the bases, a cylindrical lens support disposed on the inner peripheral side of the yoke, and a lens support. There is disclosed a lens driving device that includes a front spring disposed at a position on the front side in the optical axis direction, and an outer peripheral portion of the front spring is sandwiched and fixed between a yoke and a frame. According to the technique of Patent Document 1, the front spring can be clamped and fixed between the yoke and the frame.

JP 2010-2111242 A

  By the way, in the manufacturing process of the lens driving device, the yoke is mounted on the base, the lens support is disposed on the inner peripheral side of the yoke, the front spring is disposed on the front side, and the frame is disposed from the front side of the front spring. Then, the base, the yoke and the frame are fixed with a liquid adhesive. At this time, the liquid adhesive soaks between the yoke and the frame due to the capillary phenomenon and penetrates to the front spring sandwiched between them, and the adhesive is cured in this infiltrated state, and the front side The performance of the spring might be affected.

  Therefore, an object of the present invention is to provide a lens driving device, an autofocus camera, and a camera-equipped mobile terminal that can prevent an adhesive from entering the front spring in the manufacturing process of the lens driving device.

  According to the first aspect of the present invention, there is provided a lens support for supporting the lens on the inner periphery, a coil provided on the outer periphery of the lens support, and an annular yoke in which the lens support is movably disposed on the inner periphery. A magnet attached to the yoke and disposed so as to face the coil, front and rear springs that movably hold the lens support, and a rear spring that is disposed on the rear side in the optical axis direction of the yoke. And a frame disposed on the front side in the optical axis direction of the yoke and holding the front spring, and the lens support is moved back and forth along the optical axis direction of the lens by electromagnetic force generated by energizing the coil. In the lens driving device, the front spring is held by the frame with a gap with the yoke.

  The invention according to claim 2 is the annular leaf spring in the invention according to claim 1, and is an elastic deformation that connects the inner peripheral side portion, the outer peripheral side portion, and the inner peripheral side portion and the outer peripheral side portion. And a front end of the frame, wherein the frame includes a yoke abutting portion that abuts the yoke, and a front spring holding portion that is recessed in front of the yoke abutting portion and is formed in a stepped manner and holds the outer peripheral side portion of the front spring. It is characterized by providing.

  The invention according to claim 3 is the invention according to claim 2, wherein the outer peripheral side portion of the front spring is fixed to the front spring holding portion of the frame with an adhesive.

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

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

  According to the first aspect of the present invention, the front side spring is held on the frame with a clearance from the yoke. As a result, the front spring can be held without being sandwiched between the yoke and the frame. Therefore, in the manufacturing process of the lens driving device, when the base, the yoke, and the frame are fixed with a liquid adhesive, it is caused by capillary action. It is possible to prevent the adhesive from entering the front spring.

  According to the second aspect of the present invention, the frame abuts against the yoke at the yoke abutment portion, and the outer side portion of the front spring is retained by the front spring retaining portion formed in a stepped manner. Thereby, in the manufacturing process of a lens drive device, there can exist an effect similar to Claim 1 without increasing the number of parts.

  According to the third aspect of the invention, the effects of the second aspect are achieved, and the outer peripheral side portion of the front spring is fixed to the front spring holding portion of the frame with the adhesive. Since these can be arranged on the yoke after the assembly, the assembling work is facilitated in the manufacturing process of the lens driving device.

  According to invention of Claim 4, the auto-focus camera which has the effect as described in any one of Claims 1-3 can be provided.

  According to invention of Claim 5, the mobile terminal with a camera which has the effect of Claim 4 can be provided.

It is the perspective view which looked at the flame | frame and front side spring of the lens drive device which concerns on embodiment from the base side. It is BB sectional drawing shown in FIG. It is a disassembled perspective view of the lens drive device concerning an embodiment. It is AA sectional drawing shown in FIG. It is a perspective view which shows the general appearance of the lens drive device which concerns on embodiment.

  Embodiments of the present invention will be described below in detail with reference to FIGS. A lens driving device 1 according to the present embodiment shown in FIG. 5 is a lens driving device for an autofocus camera incorporated in a mobile phone.

  As shown in FIG. 3, the lens driving device 1 is disposed on an annular yoke 3, a lens support 5, a front spring 9 disposed on the front side of the yoke 3 in the optical axis direction, and a front side of the front spring 9. Frame 7 and a base 8 and a rear spring 11 disposed on the rear side of the yoke 3, and a rear spacer 15 is disposed between the rear spring 11 and the yoke 3. In this embodiment, the subject side is the front side, and the opposite side of the subject side is the rear side. That is, the frame 7 side is the front side, and the base 8 side is the rear side.

  The yoke 3 has a quadrilateral outer periphery when viewed from the front side and a circular inner periphery when viewed from the front, and the outer peripheral side wall 3a, the inner peripheral side wall 3b, and the outer peripheral side wall 3a and the inner peripheral side wall 3b are spaced apart. The outer peripheral side wall 3a, the inner peripheral side wall 3b, and the connecting wall 3c have a U-shaped cross section. On the inner peripheral side wall 3b, a cut portion 12 is formed from the rear end toward the front. The cut portions 12 are arranged at equal intervals in the circumferential direction. In the present embodiment, the cut portions 12 are provided at positions corresponding to between the adjacent corner portions 14 (side portions) on the outer peripheral side wall 3a having a rectangular shape in plan view. It is.

  At each corner 14 of the yoke 3, a magnet 13 is fixed to the inner peripheral surface of the outer peripheral side wall 3a. The magnet 13 is provided at the corner 14 and faces the inner peripheral side wall 3b.

  The lens support 5 has a substantially cylindrical shape. A lens (not shown) is attached to the inner periphery of the lens support 5 so that the inner periphery of the yoke 3 can be moved in the optical axis direction. An annular coil 19 is fixed to the outer periphery of the lens support 5.

  As shown in FIG. 4, the coil 19 is disposed between the outer peripheral side wall 3 a and the inner peripheral side wall 3 b of the yoke 3, but is located between the magnet 13 and the inner peripheral side wall 3 b at the corner portion 14 where the magnet 13 is located. The lens support 5 moves in the front-rear direction along the yoke 3.

  As shown in FIG. 3, the front spring 9 is an annular leaf spring, and is provided with an inner peripheral side portion 9a and an outer peripheral side portion 9b, and the inner peripheral side portion 9a is attached to the lens support 5. As shown in 1 and 2, the outer peripheral side portion 9 b is fixed to the frame 7 with a gap between it and the yoke 3. The inner peripheral side portion 9a and the outer peripheral side portion 9b are connected by an elastically deformable arm portion 9c. As shown in FIG. 3, the arm portion 9 c is disposed so as to overlap the connecting wall 3 c of the yoke 3 when viewed from the front side.

As shown in FIG. 3, the frame 7 is made of a resin material whose outer periphery has a square shape when viewed from the front side in the optical axis direction and whose inner periphery has a circular shape. On the outer periphery of the frame 7, leg portions 7 a are erected at each corner, and are fitted and fixed to the leg portions 8 a of the base 8.
As shown in FIGS. 1 and 2, the frame 7 includes a yoke contact portion 7b that contacts the yoke 3, and an outer peripheral side portion 9b of the front spring 9 that is recessed and formed in front of the yoke contact portion 7b. And a front spring holding portion 7c for holding. The outer peripheral side portion 9 b of the front spring 9 is attached to the front spring holding portion 7 c of the frame 7 by being dotted with an adhesive C.

  The height of the step between the yoke contact portion 7b and the front spring holding portion 7c is sufficiently higher than the thickness of the front spring 9, and the adhesive that bonds the base 8, the yoke 3 and the frame 7 protrudes from the yoke contact portion 7b. However, the height does not reach the front spring 9. Further, the end portion on the inner peripheral side of the front spring holding portion 7c is further recessed to the front side to form a step. The end portion of the outer peripheral side portion 9b of the front spring 9 is formed so as to be positioned substantially on the inner peripheral side with the end portion on the inner peripheral side of the front spring holding portion 7c.

  As shown in FIG. 3, the base 8 is made of an insulating resin material whose outer periphery has a rectangular shape when viewed from the front side in the optical axis direction and whose inner periphery has a rectangular shape. On the outer periphery of the base 8, leg portions 8 a are erected at the respective corners, and are fitted and fixed to the leg portions 7 a of the frame 7. In the rectangular outer peripheral surface of the base 8, two metal terminals 33 and 35 are arranged adjacent to each other on one side surface, and a fitting portion 8 b into which the end portion of the rear spring 11 is fitted is formed. .

  Although the rear spring 11 is an annular leaf spring as a whole, in the present embodiment, the rear spring 11 is composed of a first side portion 20 and a second side portion 22 which are separated into left and right. A part of each outer peripheral side portion 11b of the rear spring 11 is sandwiched between the base 8 and the yoke 3 together with the rear spacer 15 which is an insulator, and the rear spacer 15 includes the rear spring 11 and the yoke 3. The electrical insulation between is intended. Each inner peripheral side portion 11 a is attached to the rear end of the lens support 5. Each inner peripheral side portion 11a and outer peripheral side portion 11b of the rear spring 11 are connected by an elastically deformable arm portion 11c.

Although not shown, the inner peripheral side portion 11a of the one side portion 20 of the rear spring 11 is connected to one end of the coil 19, and the inner peripheral side portion 11a of the other side portion 22 of the rear spring 11 is The other end of the coil 19 is connected.
Further, the outer peripheral side portion 11 b of the one side portion 20 of the rear spring 11 is connected to the metal terminal 33, and the outer peripheral side portion 11 b of the other side portion 22 is connected to the metal terminal 35.

Next, assembly, operation, and effect of the lens driving device 1 according to the embodiment will be described.
In assembling the lens driving device 1, first, the coil 19 is assembled to the lens support 5, the magnet 13 is assembled to the yoke 3, and the front spring 9 is assembled to the frame 7.

  Next, the rear spring 11, the lens support 5, the rear spacer 15, the yoke 3, the frame 7, and the metal terminals 33 and 35 are assembled to the base 8. Thereafter, the base 8, the yoke 3 and the frame 7 are fixed by applying a liquid adhesive and then curing.

  Thus, in the assembled lens driving device 1, the inner peripheral side portion 9a of the front spring 9 attached to the lens support 5 is more than the outer peripheral side portion 9b attached to the front spring holding portion 7c of the frame 7. Located on the front side. That is, in the assembled lens driving device 1, the outer peripheral side portion 9 b of the front spring 9 is biased in a direction to be pressed against the front spring holding portion 7 c of the frame 7 by the elasticity of the arm portion 9 c.

Then, one end of the coil 19 is connected to the inner peripheral side portion 11a of the one side portion 20 constituting the rear spring 11 by an adhesive or solder, and the other end portion 22 of the coil 19 constituting the rear spring 11 is connected. The inner peripheral side portion 11a is connected with an adhesive or solder.
The lens driving device 1 according to the present embodiment is mounted on an autofocus camera incorporated in a mobile phone, and uses a metal terminal 33 and a metal terminal 35 as power supply terminals, and a rear end portion of the circuit board (not shown) as a power source. It is connected to a terminal (not shown) by, for example, soldering.

When the lens driving device 1 is driven, the metal terminal 33 connected to the power terminal of the substrate is connected to the one side 20 of the rear spring 11, the coil 19, the other side 22 of the rear spring 11, and the power terminal of the circuit board. A direct current flows through the formed metal terminal 35. At that time, since the base 8 is made of an insulator and the metal terminal 33 and the metal terminal 35 are arranged separately, current leaks between the metal terminal 33 and the metal terminal 35 via the base 8. Not flowing.
When the coil 19 is energized in this way, the lens support 5 moves against the urging force of the front spring 9 and the rear spring 11 by the electromagnetic force acting on the coil 19, and the front spring 9 and the rear spring 11 are moved. Stops at a position where the force balances with.

  According to the embodiment of the present invention, the front spring 9 is held on the frame 7 with a gap from the yoke 3. As a result, the front spring 9 can be held without being sandwiched between the yoke 3 and the frame 7, so that the base 8, the yoke 3 and the frame 7 are fixed by a liquid adhesive in the manufacturing process of the lens driving device 1. In doing so, it is possible to prevent the adhesive from entering the front spring 9 due to capillary action.

  The frame 7 abuts against the yoke 3 at the yoke abutment portion 7b, and retains the outer peripheral side portion 9b of the front spring 9 with a front spring retaining portion 7c formed in a stepped manner. Thereby, in the manufacturing process of the lens driving device 1, when the base 8, the yoke 3 and the frame 7 are fixed with the liquid adhesive, the liquid adhesive is injected into the yoke contact portion 7 b of the frame 7. However, it does not enter the front spring holding portion 7c formed in a stepped manner. Thereby, in the manufacturing process of the lens driving device 1, it is possible to prevent the adhesive from entering the front spring 9 without increasing the number of components.

  In addition, since the outer peripheral side portion 9b of the front spring 9 is dotted with the adhesive C to the front spring holding portion 7c of the frame 7, the front spring 9 can be attached to the frame 7 in advance, and these can be disposed on the yoke 3. Therefore, in the manufacturing process of the lens driving device 1, assembly work is facilitated.

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, in the above-described embodiment, the outer peripheral side portion 9b of the front spring 9 is dotted with the adhesive C on the front spring holding portion 7c of the frame 7, but after the frame 7 and the front spring 9 are assembled, Since the front spring 9 is urged by the lens support 5 in a direction to be pressed against the front spring holding portion 7 c of the frame 7, the front spring 9 may not be dotted with the adhesive C.
In the above-described embodiment, a gap is provided between the yoke 3 and the front spring 9 by providing a step between the yoke contact portion 7b and the front spring holding portion 7c in the frame 7. However, the present invention is not limited to this. In the frame 7, a notch into which the outer peripheral side portion 9b of the front spring 9 can be inserted is provided in front of the yoke contact portion 7b, and the outer peripheral side portion 9b of the front spring 9 is inserted into and held in this notch. A gap may be provided between the front spring 9 and the front spring 9.

DESCRIPTION OF SYMBOLS 1 Lens drive device 3 Yoke 5 Lens support body 7 Frame 8 Base 9 Front side spring 11 Rear side spring 13 Magnet 19 Coil

Claims (5)

A lens support for supporting the lens on the inner periphery;
A coil provided on the outer periphery of the lens support;
An annular yoke in which the lens support is movably disposed on the inner peripheral side;
A magnet attached to the yoke and arranged to face the coil;
Front and rear springs for movably holding the lens support;
A base disposed on the optical axis rear side of the yoke and holding the rear spring;
A frame disposed on the front side in the optical axis direction of the yoke and holding the front spring;
A lens driving device that moves the lens support body back and forth along the optical axis direction of the lens by electromagnetic force generated by energizing the coil,
The yoke includes at least an outer peripheral side wall and a connecting wall extending from the front end of the outer peripheral side wall toward the inner periphery,
The front spring is an annular leaf spring, and includes an inner peripheral side portion, an outer peripheral side portion, and an elastically deformable arm portion that connects the inner peripheral side portion and the outer peripheral side portion,
The frame is
A yoke contact portion that contacts the yoke toward the rear side in the optical axis direction;
A front spring holding portion that is recessed in the optical axis direction front side than the yoke contact portion and formed in a stepped manner, and holds the front spring toward the optical axis direction rear side;
The yoke contact portion and the front spring holding portion are formed integrally with the frame inside the frame so as to form a step shape along the optical axis direction,
The dimension in the optical axis direction of the step between the yoke contact portion and the front spring holding portion is larger than the thickness of the front spring,
When the front surface of the outer peripheral side portion of the front spring is bonded and fixed to the front spring holding portion with an adhesive, and the yoke contact portion is in contact with the connecting wall of the yoke, the front side The lens driving device according to claim 1, wherein the outer peripheral side portion of the spring is held by the frame with a gap provided between the yoke and the connecting wall.   The inner peripheral side end of the outer peripheral side portion of the front spring is positioned substantially at the same position as the inner peripheral end of the front spring holding portion, or on the inner peripheral side. The lens driving device described. 2. The frame according to claim 1, further comprising: a front side portion that is recessed in front of the front spring holding portion and is stepped on an inner peripheral side of the front spring holding portion and covers the front spring. Or the lens drive device of 2.   An autofocus camera comprising the lens driving device according to claim 1.   A camera-equipped mobile terminal equipped with the autofocus camera according to claim 4.

Images