JP2010008446A - Lens driving device, camera, and cellular phone with camera - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lens driving device for facilitating the assembly of a lens barrel and enabling focus adjustment, tilt adjustment and aligning adjustment, to provide a camera with the lens driving device mounted thereon, and to provide a cellular phone with the camera. <P>SOLUTION: In the lens driving device 1, a lens support 7 is arranged on an inner periphery side of a yoke 3, and the lens barrel 20 is attached to the inner periphery of the lens support 7. The lens support 7 is movable in an optical axis direction of a lens by electromagnetic force generated by energizing a coil 15, and the lens barrel 20 includes a protrusive part for fixing 26 protruding backward on a rear end face. The lens support 7 includes an adhesive groove 22 in which an adhesive is injected at a rear end in the optical axis direction. By inserting the protrusive part for fixing 26 of the lens barrel 20 inserted from a front side in the optical axis direction in the adhesive groove 22, the lens barrel is fixed by adhesion. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a lens driving device for autofocus used for a small camera, a camera equipped with the lens driving device, and a mobile phone with a camera.

  Patent Document 1 discloses a lens driving device in which a lens support is supported by a spring with respect to a base, and discloses that a lens barrel is attached to the inner periphery of the lens support after assembly of the lens driving device. .

  Although there is no direct description in Patent Document 1, generally, a thread groove is formed on the inner peripheral surface of the lens support. After the lens driving device is assembled, the lens barrel is screwed into the lens support. It is attached.

  When attaching the lens barrel, the lens barrel is screwed into the inner periphery of the lens support while adjusting the focus. However, if the lens support rotates when screwed, the spring may be damaged. In addition to preventing the rotation of the lens support using a tool, processing for attaching a rotation prevention jig to the housing and the spring is required.

JP 2008-33252 A

  However, in the conventional lens driving device described above, when assembling the lens barrel, the lens support is fixed so as not to rotate by using a rotation prevention jig that prevents the lens support from rotating. There was a problem that it took time and effort. Further, when the lens barrel is fixed to the lens support by screwing, there is a problem that the tilt adjustment and centering adjustment (center adjustment) of the lens barrel cannot be performed.

  Therefore, the present invention has an object to provide a lens driving device capable of easily assembling a lens barrel and performing tilt adjustment and centering adjustment together with focus adjustment, a camera equipped with the lens driving device, and a camera-equipped mobile phone. To do.

  The invention described in claim 1 includes an annular yoke, a lens support having a coil fixed to the outer periphery, a plurality of magnets, a spring, and a base, and each magnet is disposed on the inner periphery of the outer peripheral wall of the yoke. The lens support is arranged on the inner circumference side of the yoke, and the lens barrel is mounted on the inner circumference. The coil is arranged on the inner circumference of the magnet so as to face the magnet, and the spring. Is provided between the base or yoke and the lens support, and supports the lens support movably back and forth in the optical axis direction with respect to the base. The lens support is supported by electromagnetic force generated by energizing the coil. A lens driving device that moves in the optical axis direction of a lens, wherein the lens barrel has a fixing protrusion protruding rearward on the rear end surface, and the lens support is an adhesive at the rear end portion in the optical axis direction. The glue that will be injected It has a groove, characterized in that the insert and the lens barrel fixing projection of the inserted lens barrel in the optical axis direction front side to the adhesive groove are enabling bonded.

  According to a second aspect of the present invention, in the first aspect of the present invention, the lens support has a plurality of coil fixing portions provided at intervals along the circumferential direction, and the adhesive groove is formed by adjacent coils. It is provided between fixed parts.

  The invention according to claim 3 is the invention according to claim 2, wherein one of the lens barrel and the lens support has an auxiliary fixing protrusion at the front end, and the other has an auxiliary fixing protrusion at the front end. It is characterized in that an auxiliary fixing protrusion is engaged in the engaging groove so as to be adhesively fixed.

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

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

  According to the first aspect of the invention, when the lens barrel is assembled to the lens driving device, the adhesive is injected into the adhesive groove of the lens support, and the lens barrel is held by a jig such as tweezers. The lens barrel is inserted into the inner circumference of the body, the fixing protrusion provided at the rear end of the lens barrel is positioned in the adhesive groove of the lens support, and the lens barrel is adjusted while adjusting the focus of the lens barrel. The lens barrel is fixed to the lens support by adjusting the tilt and adjusting the center and curing the adhesive at that position.

  The focus adjustment of the lens barrel adjusts the position of the lens barrel in the optical axis direction (front and rear), the centering adjustment adjusts the position of the lens barrel in the radial direction, and the tilt adjustment adjusts the lens barrel with respect to the optical axis. Can be done by tilting. Along with such adjustment of the lens barrel, the fixing projection provided at the rear end of the lens barrel is three-dimensionally changed in the adhesive groove of the lens support, and when the adjustment is completed, The lens barrel is fixed to the lens support at that position by curing the adhesive accumulated in the lens.

  Therefore, according to the present invention, since the lens barrel fixing protrusion is fixed by the adhesive in the adhesive groove of the lens support, the lens barrel can be easily assembled to the lens support and Tilt adjustment and centering adjustment can be performed together with focus adjustment.

  Moreover, when the lens barrel is assembled to the lens support, focus adjustment, tilt adjustment, and centering adjustment of the lens barrel can be performed at one time, and the lens barrel can be fixed as it is with an adhesive.

  In addition, since the lens barrel is not attached to the lens support by screwing as in the prior art, there is no need to process a rotation prevention jig mounting hole or the like on a component such as a spring, so the degree of freedom in design is high. At the same time, the component strength can be increased.

  According to the second aspect of the present invention, the effect described in the first aspect can be obtained, and the adhesive groove can be provided without increasing the radial dimension of the lens support.

  According to the invention described in claim 3, since the function and effect described in claim 2 can be obtained, and the lens barrel is fixed at the rear end and the front end in the optical axis direction. And can be prevented from being displaced with respect to the lens support.

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

  According to the invention described in claim 5, it is possible to provide a camera-equipped mobile phone having the function and effect described in claim 4.

  Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 shows a state in which a lens barrel is assembled to a lens driving device according to an embodiment of the present invention. FIG. 1A is a perspective view showing a corner portion of the lens driving device, and FIG. FIG. 2 is a cross-sectional view taken along line AA of FIG. 2A, FIG. 2 is a perspective view showing a yoke, a lens support, and a base extracted at a corner of the lens driving device, and FIG. 3 is a perspective view of a lens barrel. 4 is a plan view of the lens driving device viewed from the front side in the optical axis direction, FIG. 5 is an exploded perspective view of the lens driving device according to the embodiment of the present invention, and FIG. 6 is a lens driving with a lens barrel assembled. It is a longitudinal cross-sectional view which cut | disconnects and shows an apparatus in the position of a corner | angular part and a side part.

  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. 5 and 6, the lens driving device 1 includes an annular yoke 3, a lens support 7, a front spring 9, a rear spring 11, and a base 5. A coil 15 is fixed to the outer periphery of the body 7. A rear insulator (rear spacer) 17 is disposed between the yoke 3 and the rear spring 11, and a front spacer 18 is disposed between the yoke 3 and the front spring 9. This lens driving device 1 is very small with a length and width of about 7 mm and a height of about 3 mm.

  The yoke 3 has a quadrangular outer periphery when viewed from the front side and a circular inner periphery when viewed from the front side. The inner wall 3b is disposed with a space between the outer wall 3a and the inner wall 3b. The outer wall 3a, the inner wall 3b and the connecting wall 3c have a U-shaped cross section. ing. The inner wall 3b is formed by bending a portion continuous with the connecting wall 3c, and cut portions 16 are formed on both sides in the circumferential direction to facilitate bending.

  At each corner 14 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 on the corner portion 14.

  The lens support 7 is disposed on the inner peripheral side of the yoke 3 and supported by a front spring 9 and a rear spring 11, and a lens barrel (see FIGS. 1 and 3) 20 is assembled to the inner periphery thereof. The yoke 3 is provided so as to be movable in the optical axis direction (front-rear direction) on the inner peripheral side of the yoke 3.

  The coil 15 is bonded and fixed to a coil fixing portion 19 provided integrally with the lens support 7. As shown in FIGS. 1A and 2, the coil fixing portion 19 has a coil placement portion 19 a that receives the rear end surface of the coil 15 and a coil inner periphery receiving portion 19 b that receives the inner peripheral side surface of the coil 15. The coil inner periphery receiving portion 19b is provided so as to protrude radially outward to a position where it interferes with the yoke inner wall 3b, and the coil mounting portion 19a protrudes radially outward from the yoke inner wall 3b. ing.

  As shown in FIGS. 1B and 2, an adhesive groove 22 into which an adhesive is injected is formed between the adjacent coil fixing portions 19 and 19 at the rear end portion of the lens support 7. . In the adhesive groove 22, a fixing protrusion 26 of the lens barrel 20 described later is disposed, and the fixing protrusion 26 is bonded and fixed to the adhesive groove 22.

  The coil 15 is disposed on the inner peripheral side of the yoke outer peripheral wall 3a. At the corner portion 14 of the yoke 3 where the magnet 13 is disposed, the coil 15 is positioned between the magnet 13 and the inner wall 3b, together with the lens support 7. The yoke 3 moves in the front-rear direction.

  The coil 15 is fixed to each of two surfaces of the coil mounting portion 19a and the coil inner periphery receiving portion 19b with an adhesive.

  As shown in FIGS. 1A and 5, an outer peripheral side portion 11 b of the rear spring 11 is placed on the base 5, and an insulator (spacer) 17 is provided on the outer peripheral side portion 11 b of the rear spring 11. The yoke 3 is placed via

  As shown in FIG. 5, the front spring 9 is a leaf spring having an outer peripheral side portion 9 b that is annular, and is provided with an inner peripheral side portion 9 a and an outer peripheral side portion 9 b, and the inner peripheral side portion 9 a is the lens support 7. The outer peripheral side portion 9b is sandwiched between the yoke connecting wall 3c and the front spacer 18 and fixed on the coil 15 side of the yoke connecting wall 3c. The inner peripheral side portion 9a and the outer peripheral side portion 9b are connected by an elastically deformable arm portion 9c.

  Although the rear spring 11 is an annular leaf spring as a whole, in this embodiment, the rear spring 11 is composed of one side portion 30 and the other side portion 32 which are divided into left and right. The outer peripheral side portions 11 b and 11 b of the rear spring 11 are sandwiched between the base 5 and the yoke 3 via an insulator (spacer) 17, and the insulator 17 is formed between the rear spring 11 and the yoke 3. The electrical insulation between them is intended. The inner peripheral side portions 11 a and 11 a are attached to the rear end of the lens support 7. Each inner peripheral side portion 9a and outer peripheral side portion 9b of the rear spring 11 are connected by an elastically deformable arm portion 11c.

  In the present embodiment, a terminal 33 is formed on one side 30 constituting the rear spring 11, and a terminal 35 is formed on the other side 32, and each terminal 33, 35 is connected to a power supply terminal. It has come to be. The one side portion 30 and the other side portion 32 are electrically connected to the coil 15 by soldering or the like, respectively, and the coil 15 is energized from the rear spring 11.

  As shown in FIG. 3, the lens barrel 20 has four recesses (holes) formed at equal intervals on the front end surface as insertion holes 25 for the jig, and is fitted on the peripheral surface so as to protrude radially outward. Joint portions 24 are provided at intervals in the circumferential direction. As shown in FIG. 1A, the fitting portion 24 is disposed so as to form a slight gap between the coil fixing portions 19 and 19 of the lens support 7.

  A fixing protrusion 26 is provided at the rear end of the fitting portion 24 so as to protrude rearward in the optical axis direction. The fixing protrusion 26 is disposed in the adhesive groove 22 of the lens support body 7 in the front and rear direction. It is arranged so as to be movable in the radial direction and is fixedly attached and fixed in the adhesive groove 22.

  Next, a method, an operation, and an effect of assembling the lens barrel 20 to the lens driving device 1 according to the present invention will be described.

  When the lens barrel 20 is assembled to the lens driving device 1 according to the present invention, an adhesive is injected into the adhesive groove 22 of the lens support 7, and for example, tweezers are inserted into the jig insertion hole 25 of the lens barrel 20. The barrel 20 is picked and inserted into the inner peripheral side of the lens support 7. Then, the fixing projection 26 of the lens barrel 20 is positioned in the adhesive groove 22 of the lens support 7, and while adjusting the focus of the lens barrel 20, the tilt adjustment and centering adjustment of the lens barrel 20 are performed. The lens barrel 20 is fixed to the lens support 7 by curing the adhesive in the adhesive groove 22 at the position and fixing the fixing projection 26 in the adhesive groove 22.

  The adhesive may be an instantaneous adhesive and may be fixed within a few seconds after the position of the lens barrel 20 is adjusted, or may be cured by heating or cooling.

  The focus adjustment of the lens barrel 20 adjusts the position of the lens barrel 20 in the optical axis direction (front and rear), the centering adjustment adjusts the position by shifting the lens barrel 20 in the radial direction, and the tilt adjustment adjusts the position of the lens barrel. Can be performed by tilting with respect to the optical axis. Such adjustment of the lens barrel is performed by three-dimensionally changing the position of the fixing protrusion 26 provided at the rear end of the lens barrel 20 within the range of the adhesive groove 22 of the lens support 7 and fixing as it is. The protrusion 26 is held in the adhesive groove 22 and fixed by hardening the adhesive accumulated in the adhesive groove 22 at that position.

  According to the present invention, the fixing protrusion 26 of the lens barrel 20 is fixed by the adhesive in the adhesive groove 22 of the lens support 7, so that the lens barrel 20 can be assembled to the lens support 7. It can be easily performed, and tilt adjustment and centering adjustment can be performed together with focus adjustment.

  In addition, when the lens barrel 20 is assembled to the lens support 7, focus adjustment, tilt adjustment, and centering adjustment of the lens barrel 20 can be performed at one time, and the lens barrel 20 can be fixed as it is with an adhesive.

  Further, since the lens barrel 20 is not attached to the lens support by screwing as in the prior art, it is not necessary to process the anti-rotation jig mounting hole or the like on the component parts such as the lens support 7 or the front spring 9. Therefore, the degree of freedom in design is high and the strength of the parts can be increased.

  Since the adhesive groove 22 is provided between the adjacent coil fixing portions 19 and 19 in the circumferential direction of the lens support 7, it can be provided without increasing the radial dimension of the lens support 7.

  In the present embodiment, when the lens support 7 is about to rotate, as shown in FIG. 1A, the coil fixing portion 19 of the lens support 7 comes into contact with the circumferential end surface of the yoke inner wall 3b to support the lens. The rotation of the body 7 is prevented. Accordingly, even when an external force is applied to the lens driving device 1 due to shaking or dropping of the camera-equipped mobile phone, it is possible to prevent the lens support 7 from rotating with respect to the yoke 3. Can prevent damage.

  Since the front spring 9 is housed inside the yoke 3, the frame used in the past to fix the front spring 9 to the outer surface of the yoke 3 becomes unnecessary, and the number of parts can be reduced and there is no frame. The dimension in the lens optical axis direction can be reduced, and further miniaturization can be achieved.

  Since the lens barrel 20 has a plurality of jig insertion holes 25 formed on the front surface, the lens barrel 20 can be easily grasped with general-purpose tweezers, and the assembly work is easy.

  Conventionally, a lens gripping projection is provided on the front surface of the lens barrel 20, but in this embodiment, the insertion hole 25 provided on the front surface is used instead. Can be small.

  Other embodiments of the present invention will be described below. In the embodiments described below, parts having the same operational effects as those of the above-described embodiments are denoted by the same reference numerals. Detailed description of the portions will be omitted, and in the following description, differences from the above-described embodiment will be mainly described.

  FIG. 7 shows a second embodiment. FIG. 7 shows a state in which the lens barrel 20 is assembled to the lens driving device 1 according to the second embodiment, and FIG. 7A is a perspective view showing the corner portion 14 of the lens driving device 1 cut away. ) Is a front view of the portion B shown in FIG.

  In the second embodiment, the coil fixing portion 19 of the lens support 7 has engagement grooves 31 formed on both sides in the circumferential direction and at the front end in the optical axis direction, and in the circumferential direction at the front end of the lens barrel 20. Auxiliary fixing projections 33 are provided to project, and the auxiliary projections 33 are engaged with the engagement grooves 31 when the lens barrel 20 is inserted into the inner periphery of the lens support 7. In the second embodiment, when the lens barrel 20 is bonded and fixed, the fixing protrusion 26 is fixed by the adhesive groove 22, and then the adhesive is interposed between the engagement groove 31 and the auxiliary protrusion 33. Inject and fix.

  In the second embodiment, the same effects as those of the first embodiment described above are obtained, and the lens barrel 20 is fixed at the rear end portion and the front end portion in the optical axis direction. The lens support 7 can be prevented from being displaced. In particular, it is possible to prevent the lens barrel 20 from being inclined or displaced with respect to the lens support 7 even when an external force such as dropping is applied.

  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 fixing protrusions 26 are not limited to being provided on all four fitting portions 24 of the lens barrel 20, and may be provided on the two fitting portions 24 or the three fitting portions 24.

  In the second embodiment, the auxiliary fixing projection 33 is provided in at least one fitting portion 24 of the lens barrel 20, and the lens support 7 is provided with at least one engagement groove 31 corresponding thereto. It may be a thing.

  In the second embodiment, the engaging groove 31 may be provided in the lens barrel 20 and the auxiliary fixing protrusion 33 may be provided in the coil fixing portion 19 of the lens support 7.

The state which assembled | attached the lens barrel to the lens drive device which concerns on embodiment of this invention is shown, (a) is a perspective view which cut | disconnects and shows the corner | angular part of a lens drive device, (b) is (a). It is AA sectional drawing. FIG. 5 is a perspective view showing a yoke, a lens support, and a base extracted from a corner portion of the lens driving device. It is a perspective view of a lens barrel. It is the top view which looked at the lens drive device from the optical axis direction front side. It is a disassembled perspective view of the lens drive device concerning an embodiment of the invention. It is a longitudinal cross-sectional view which cut | disconnects and shows the lens drive device which assembled | attached the lens barrel at the position of a corner | angular part and a side part. The state which assembled | attached the lens barrel to the lens drive device which concerns on 2nd Embodiment is shown, (a) is a perspective view which cut | disconnects and shows the corner | angular part of a lens drive device, (b) is shown to (a). It is the front view which looked at the B section from the perimeter side.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Lens drive device 3 Yoke 5 Base 7 Lens support body 9 Front side spring (spring)
11 Rear spring (spring)
13 Magnet 15 Coil 19 Coil fixing part 20 Lens barrel 22 Adhesive groove 26 Fixing protrusion 31 Engaging groove 33 Auxiliary fixing protrusion

Claims (5)

An annular yoke, a lens support having a coil fixed to the outer periphery, a plurality of magnets, a spring, and a base are provided. Each magnet is disposed on the inner periphery of the yoke outer peripheral wall, and the lens support is a yoke. The lens barrel is mounted on the inner periphery, the coil is disposed on the inner periphery of the magnet so as to face the magnet, the spring is the base or yoke, and the lens support. The lens support is supported between the base and the base so that the lens support can be moved back and forth in the optical axis direction, and the lens support is moved in the optical axis direction of the lens by electromagnetic force generated by energizing the coil. A driving device comprising:
The lens barrel has a fixing protrusion protruding rearward on the rear end surface, and the lens support has an adhesive groove into which an adhesive is injected at the rear end in the optical axis direction, and the front side in the optical axis direction. A lens driving device characterized in that a lens barrel can be bonded and fixed by inserting a fixing projection of the lens barrel inserted into the adhesive groove.   The lens support body has a plurality of coil fixing portions provided at intervals along the circumferential direction, and the adhesive groove is provided between adjacent coil fixing portions. Lens drive device.   One of the lens barrel and the lens support has an auxiliary fixing protrusion at the front end, the other has an engaging groove of the auxiliary fixing protrusion at the front end, and the auxiliary fixing protrusion in the engaging groove. The lens driving device according to claim 2, wherein the lens driving device can be fixed by bonding.   A camera comprising a lens driving device according to any one of claims 1 to 3 to which a lens barrel is fixed.   A camera-equipped mobile phone comprising the camera according to claim 4.

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