JP2008203284A - Lens drive unit, camera, and mobile phone with camera - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lens drive unit in which the outer circumferential part of a spring can be joined and fixed to its adjacent member with an adhesive without impairing the function of the arm of the spring, and to provide a camera and a mobile phone with a camera. <P>SOLUTION: In the lens drive unit 1, the spring 9 has an internal circumferential part 9a, the outer circumferential part 9b, and an arm 9c connecting the internal circumferential part 9a to outer circumferential part 9b. The outer circumferential part 9b is disposed between the yoke 3 and housing 6. Using the adhesive S injected from the adhesive injection hole 6b of the housing 6, the outer circumferential part 9b of the spring 9 is joined and fixed to the yoke (adjacent member) 3. The yoke 3 has a groove 16 or hole at least in the part of the arm end 21 of the spring 9. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

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

  In this type of lens driving device, Patent Document 1 includes a spring (front spring) having an inner peripheral side portion, an outer peripheral side portion, and an arm portion that connects the inner peripheral side portion and the outer peripheral side portion. A configuration is disclosed in which the inner peripheral side portion of the spring is fixed to the lens support and the outer peripheral side portion is disposed between the yoke and the housing portion (front housing portion).

  Although there is no specific description about fixing of the outer peripheral part of the spring, an adhesive inflow hole is provided in the casing (front casing), and the thermosetting adhesive flowing in from the adhesive inflow hole is heated. Thus, the housing portion (adjacent member of the spring outer peripheral portion) and the outer peripheral portion of the spring and the yoke (adjacent member of the spring outer peripheral portion) and the outer peripheral portion of the spring are bonded and fixed. That is, in the adhesive fixing at the outer periphery of the spring, the thermosetting adhesive is temporarily fluidized by heating, so that it is between the casing and the outer peripheral side of the spring or between the yoke and the outer peripheral portion of the spring. Adhesives were introduced by capillarity (surface tension) to fix them.

JP 2006-323251 A

  However, as shown in FIGS. 10 and 11, when the adhesive S flows between the casing (front casing) 6 and the outer peripheral side 9b of the spring by capillary action, the outer peripheral side 9b of the spring When the adhesive flows along the surface and reaches the arm end 21 of the spring, the adhesive also flows into the arm 9c, and the arm 9c is moved to the yoke 3 or the like by the adhesive S protruding to the arm end 21. There is a problem that the function of the arm portion 9c is hindered by being fixed to the adjacent member.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a lens driving device, a camera, and a camera-equipped mobile phone that can adhere and fix an outer peripheral portion of a spring to an adjacent member thereof without hindering the function of an arm portion of the spring.

  The invention according to claim 1 includes an annular yoke, a lens support body disposed on the inner peripheral side of the yoke and having a coil fixed to the outer periphery, a magnet, a spring, and a housing portion. The spring is disposed on the inner peripheral side of the outer peripheral wall of the yoke, and the spring has an inner peripheral side portion, an outer peripheral side portion, and an arm portion connecting the inner peripheral side portion and the outer peripheral side portion, and the inner peripheral side portion. Is fixed to the lens support, and the outer peripheral side portion is disposed between the yoke and the housing. The lens support is supported by the yoke so as to be movable in the optical axis direction, and the coil is energized. The lens driving device moves the lens support body back and forth along the optical axis direction of the lens by electromagnetic force generated by the electromagnetic force, and the housing portion is provided with an adhesive injection hole, and the adhesive injection hole of the housing portion The outer peripheral side of the spring is bonded and fixed to the adjacent member with the adhesive injected from The adjacent member on the outer peripheral side of pulling, characterized in that the Mizomata the site located at the arm portion end of at least the spring are holes provided.

  According to a second aspect of the present invention, there is provided a camera comprising the lens driving device according to the first aspect.

  According to a third aspect of the present invention, there is provided a camera-equipped mobile phone including the camera according to the second aspect.

  According to the first aspect of the present invention, when the adhesive flowing in from the adhesive injection hole flows in between the outer peripheral side portion of the spring and its adjacent member (housing, yoke, or spacer) by capillary action. The adhesive flows through the gap between the outer peripheral side portion of the spring and the adjacent member due to surface tension, but flows around the portion by a groove or hole provided in the adjacent member, and the adjacent member and the arm end. To prevent adhesion. Accordingly, it is possible to prevent the adhesive from fixing the end of the arm portion or a part of the arm portion to the adjacent member and inhibiting the function of the spring.

  According to the invention described in claim 2, it is possible to provide a camera having the function and effect described in claim 1.

  According to the invention described in claim 3, it is possible to provide a camera-equipped mobile phone having the function and effect described in claim 2.

  Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a cross-sectional view showing the relationship between a yoke, a spring, and a front casing when the adhesive fluidizes in the lens driving device according to the first embodiment of the present invention. FIG. FIG. 3 is a cross-sectional view taken along the line AA of FIG. 7, and FIG. 4 is a plan view of a front spring (spring), for explaining the flow of the adhesive, excluding the front housing portion. FIG. 5 is an exploded perspective view of the lens driving device according to the first embodiment of the present invention as viewed from the front side, and FIG. 6 is an exploded perspective view of the lens driving device according to the first embodiment of the present invention as viewed from the rear side. FIG. 7 is a perspective view of the lens driving device according to the first embodiment.

  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. 3, 5, and 6, the lens driving device 1 includes an annular yoke 3, a lens support 7, a front spring (spring) 9, a rear spring 11, and a rear of the yoke 3. A rear housing portion 5 disposed on the side and a front housing portion (housing portion) 6 disposed on the front side of the yoke 3, and a coil 15 is fixed to the outer periphery of the lens support 7. Has been. An insulator (spacer) 17 is disposed between the yoke 3 and the rear spring 11. This lens driving device 1 is very small with about 10 mm in length and width and about 3.5 mm in height.

  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 outer peripheral wall 3a, the inner peripheral wall 3b, and the connecting wall 3c connecting the outer peripheral wall 3a and the inner peripheral wall 3b. The outer peripheral wall 3a, the inner peripheral wall 3b, and the connecting wall 3c have a U-shaped or U-shaped cross section. On the inner peripheral 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 between adjacent corner portions 14 (side portions) on the outer peripheral wall 3a having a rectangular shape in plan view. .

  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 in the corner portion 14 and is not located at a position corresponding to the cut portion 12 formed in the inner peripheral wall 3b.

  As shown in FIGS. 1, 2, and 5, a groove 16 is formed in the connecting wall 3 c of the yoke 3. The groove 16 is formed between the adjacent corners 14 and 14 along the side of the quadrangle in plan view, and the groove 16 is positioned at a position located at least at the arm end 21 in the outer peripheral side portion 9b of the front spring 9. is doing.

  As shown in FIGS. 5 and 6, the lens support 7 has a substantially cylindrical shape, and a lens (not shown) is mounted on the inner peripheral portion thereof, and the inner peripheral side of the yoke 3 is arranged in the optical axis direction (front-rear direction). ) Is movably provided. An annular coil 15 is mounted on the outer periphery of the lens support 7, and the coil 15 is bonded and fixed to a coil fixing portion 19 provided integrally with the lens support 7.

  Although the coil 15 is disposed between the outer peripheral wall 3a and the inner peripheral wall 3b of the yoke 3 (see FIG. 3), the lens 13 is located between the magnet 13 and the inner peripheral wall 3b at the corner 14 where the magnet 13 is located. 7 and the yoke 3 are moved in the front-rear direction.

  As shown in FIGS. 5 and 6, the rear housing portion 5 has a quadrangular outer shape in plan view, and includes an outer wall 5 a located on the outer circumference of the yoke 3 and a base portion 5 b located on the rear side of the yoke 3. The outer peripheral side portion 11 b of the rear spring 11 is placed on the base portion 5 b of the rear casing portion 5.

  In the rear casing 5 having a rectangular shape in plan view, the outer wall 5 a is erected at each corner, and the inner peripheral surface of the outer wall 5 a faces the outer peripheral wall 3 a of the yoke 3. A step portion 5c is formed on the outer peripheral side of each outer wall 5a. Further, the outer wall 5a is divided into two by a gap 5d in the extending direction.

  The front housing portion (housing portion) 6 is disposed on the front side of the yoke 3, holds the outer peripheral side portion 9 b of the front spring 9 between the yoke 3 and the rear housing on the outer periphery of the yoke 3. The housing of the lens driving device 1 is formed by being connected and fixed to the body part 5. In the present embodiment, the adjacent member that faces the outer peripheral side 9 b of the front spring 9 is the yoke 3.

  The front housing part 6 has a square shape in plan view, and leg parts 6a are erected from the corners toward the rear side. The outer wall of the rear housing part 5 is provided on the inner peripheral side of the leg parts 6a. 5a is located, and the tip of the leg portion 6a is in contact with the stepped portion 5c of the rear housing portion 5.

  An adhesive inflow hole 6 b is formed at each corner on the front surface of the front housing portion 6. The adhesive inflow hole 6b is located on the inner peripheral side of the leg 6a so that the adhesive flowing in from the adhesive inflow hole 6b flows between the inner peripheral surface of the leg 6a and the outer peripheral wall 3a of the yoke 3. It has become.

  The front spring 9 is an annular leaf spring having a rectangular outer shape in plan view, and is provided with an inner peripheral side portion 9a and an outer peripheral side portion 9b. The inner peripheral side portion 9a is attached to the lens support 7 and The side portion 9 b is sandwiched and fixed between the yoke 3 and the front housing portion 6. The inner peripheral side portion 9a and the outer peripheral side portion 9b are connected by an elastically deformable arm portion 9c. In the present embodiment, the arm portions 9c are provided at four locations, and as shown in FIG. 4, the end 21 of each arm portion 9c is shifted from the corner portion in the circumferential direction on the outer peripheral side portion 9b. At each corner portion of the front spring 9, a cutout portion 18 for arranging the leg portion 6 a of the front housing portion 6 is formed. The cut portion 18 is provided corresponding to the position of the adhesive inflow hole 6 b of the front housing portion 6.

  In the outer peripheral side portion 9b of the front spring 9, there is an inner peripheral edge in the outer peripheral side portion 9b between the position of the end (arm end) 21 of the arm portion 9c and the cut portion (facing position with the adhesive inflow hole) 18. A narrow portion 23 is formed by narrowing the width between the outer peripheral edge and the outer peripheral edge. In the present embodiment, the width of the narrow portion 23 is narrowed by forming the recess 24 on the outer peripheral edge of the outer peripheral side portion 9b.

  As shown in FIGS. 5 and 6, the rear spring 11 is an annular leaf spring as a whole. In the present embodiment, the rear spring 11 is composed of one side portion 30 and the other side portion 32 divided into left and right. Yes. The outer peripheral side portions 11 b and 11 b of the rear spring 11 are sandwiched between the rear housing portion 5 and the yoke 3 via an insulator (spacer) 17, and the insulator 17 is connected to the rear spring 11. Electrical insulation with the yoke 3 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 11a and outer peripheral side portion 11b 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, so that the coil 15 is energized from the rear spring 11.

  The front spring 9 and the rear spring 11 are flat in a natural state before assembly (a state before the front housing portion 6 is assembled) (see FIGS. 5 and 6), but at least the front spring 9 is After assembly, as shown in FIG. 3, the inner peripheral side portion 9a is attached in an elastically deformed state so as to be positioned in front of the outer peripheral side portion 9b. Accordingly, the inner peripheral side portion 9a constantly urges the lens support 7 with the urging force directed toward the rear housing portion 5 by the restoring force of the arm portion 9c.

  Next, assembly, operation, and effects of the lens driving device 1 according to the first embodiment will be described. As shown in FIG. 5, the lens driving device 1 is assembled by the rear housing 11, the rear spring 11, the spacer 17, the yoke 3 with the magnet 13 fixed inside, the carrier 7 with the coil 15 fixed, and the front spring. 9 and the front housing part 6 are assembled. In assembling the rear housing portion 5 and the front housing portion 6, the leg portion 6 a of the front housing portion 6 is arranged on the outer peripheral side of the outer wall 5 a of the rear housing portion 5, and the tip of the leg portion 6 a Is brought into contact with the stepped portion 5c.

  After assembling each component, the adhesive S (see FIGS. 1 and 2) is injected from the adhesive inflow hole 6b formed in the front housing portion 6. In the present embodiment, the adhesive S is a thermosetting adhesive. When the adhesive S is injected from the adhesive inflow hole 6b, the adhesive S is injected between the outer peripheral wall 3a of the yoke 3 and the leg portion 6a of the front housing part 6, and further, the outer wall 5a of the rear housing part 5 is injected. And the outer peripheral wall 3a of the yoke 3 and the step 5c.

  Next, when the lens driving device 1 is heated, the thermosetting adhesive is temporarily fluidized and has a low viscosity. Therefore, as shown in FIGS. 6 and the outer peripheral side portion 9b of the front spring 9 and the clearance between the outer peripheral side portion 9b of the front spring 9 and the yoke 3 flow in the circumferential direction along the surface of the outer peripheral side portion 9b of the spring. 2 and FIG. 9 to be described later, the adhesive S indicated by hatching indicates the flow of the adhesive S in the gap between the yoke 3 and the outer peripheral side portion 9b of the spring.

  In the outer peripheral side portion 9b of the front spring 9, a narrow portion 23 is formed between the cut portion (position facing the adhesive inflow hole) 18 and the end 21 of the arm portion 9c. It is possible to reduce the flow rate of the adhesive S flowing through the flow path, and it becomes a flow resistance, thereby preventing the fluidized adhesive S from reaching the position of the arm end 21. Thereafter, the temporarily fluidized adhesive S increases in viscosity due to heat curing and is cured.

  Therefore, when the adhesive S is fluidized, the adhesive S does not reach the base end 21 of the arm 9c of the front spring 9, so that the arm 9c is not bonded and fixed to the yoke 3 and the arm 9c. Can prevent the elastic deformation function from being impaired.

  Further, when the adhesive S reaches the groove 16 of the yoke 3 when the adhesive S is fluidized, it flows around the groove 16 of the yoke 3, so that the adhesive S reaches the arm end 21. It is possible to prevent the adhesive S from being applied to the arm portion 9c of the front spring 9.

  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, and the lens support 7 has the front spring 9 and the rear spring 11. It moves against the urging force and stops at a position where the forces of the springs 9 and 11 are balanced.

  Next, a second embodiment of the present invention will be described with reference to FIGS. In the embodiment described below, the same reference numerals are given to the portions having the same operational effects as those of the first embodiment described above, and the detailed description thereof is omitted.

  In the second embodiment, the yoke 3 is formed by forming a plate material into a cylindrical shape, and a front side locking portion 3e that locks with the front housing portion (housing portion) 6 is formed at the front end thereof. A rear locking portion 3f that locks with the rear housing portion 5 is formed at the rear end, and the yoke 3 serves as a skeleton of the lens driving device between the front housing portion 6 and the rear housing portion 5. It is something that is made. Moreover, the point which has arrange | positioned the spacer (adjacent member) 20 between the spring 9 and the yoke 3 is mainly different from the above-mentioned 1st Embodiment. In the second embodiment, a coil spacer 28 is provided between the two coils 15.

  In the second embodiment, as shown in FIG. 9, the spacer (adjacent member) 20 is formed with a hole 26 at the position of the arm end 21 of the spring 9, and an adhesive S is formed on the arm end 21. Since the adhesive S flows around the hole 26 when it is about to reach, the arm end 21 is prevented from being adhered and fixed to the spacer 20 by the adhesive S.

  In the second embodiment, a hole 18 (position facing the adhesive inflow hole) is formed in the outer peripheral side portion 9b of the spring 9 in place of the cut portion 18 described above.

  Also in the second embodiment, the same effects as those in the first embodiment described above can be obtained.

  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 front housing part 6, the rear housing part 5, and the spring 9 are not limited to a square shape in plan view but may be circular in plan view, and the shape is not limited.

  The adjacent member is not limited to the yoke 3 or the spacer 20 but may be the housing 6. In this case, a groove or a hole is formed in the housing 6 at a position facing the arm end 21 of the spring. There may be.

  Furthermore, the adhesive S is not limited to a thermosetting adhesive, and an adhesive having a low viscosity at room temperature may be used.

In the lens drive device which concerns on 1st Embodiment, it is sectional drawing which shows the relationship between a yoke, a spring, and a front side housing | casing part when an adhesive agent is fluidized. FIG. 2 is a plan view illustrating a flow of an adhesive in FIG. 1 excluding a front housing portion. It is AA sectional drawing of FIG. It is a top view of a front side spring (spring). It is the disassembled perspective view which looked at the lens drive device concerning a 1st embodiment from the front side. It is the disassembled perspective view which looked at the lens drive device concerning a 1st embodiment from the back side. It is a perspective view of the lens drive device shown in FIG. It is the disassembled perspective view which looked at the lens drive device concerning a 2nd embodiment from the front side. In the lens driving device according to the second embodiment, the relationship between the spacer, the spring, and the front case when the adhesive is fluidized is shown excluding the front case in order to explain the flow of the adhesive. It is a top view. It is sectional drawing which shows the relationship between a yoke, a spring, and a front side housing | casing part when the adhesive agent in a prior art is fluidized. FIG. 11 is a plan view illustrating a flow of an adhesive in FIG. 10 excluding a front housing portion.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Lens drive device 3 Yoke 6 Front side housing | casing part (housing | casing part)
6b Adhesive inflow hole 7 Lens support 9 Front spring (spring)
13 Magnet 15 Coil 16 Groove (groove of adjacent member)
18 Cut section (position facing the adhesive inflow hole)
21 Base end of arm 26 hole (hole of adjacent member)
S adhesive

Claims (3)

  An annular yoke, a lens support that is disposed on the inner peripheral side of the yoke and has a coil fixed to the outer periphery, a magnet, a spring, and a housing, are provided on the inner peripheral side of the outer peripheral wall of the yoke. The spring has an inner peripheral side portion, an outer peripheral side portion, and an arm portion that connects the inner peripheral side portion and the outer peripheral side portion, and fixes the inner peripheral side portion to the lens support and the outer periphery. The side portion is disposed between the yoke and the housing portion, and the lens support is supported so as to be movable in the optical axis direction with respect to the yoke. The lens support is supported by electromagnetic force generated by energizing the coil. A lens driving device that moves back and forth along the optical axis direction of a lens, wherein an adhesive injection hole is provided in the casing, and the outer periphery of the spring is formed by the adhesive injected from the adhesive injection hole of the casing Adhering and fixing the side part to the adjacent member, next to the outer peripheral side part of the spring The member, a lens driving device, characterized in that the Mizomata the site located at least the spring arm portion end are holes provided.   A camera comprising the lens driving device according to claim 1.   A camera-equipped mobile phone equipped with the camera according to claim 2.

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