JP2006337927A - Lens drive device - Google Patents

Abstract

An object of the present invention is to obtain a lens driving device excellent in impact resistance.
A lens driving device according to the present invention includes a carrier including a lens, springs and that support the carrier with respect to a base and a frame, a coil, and a magnet. The carrier 7 is moved in the optical axis direction of the lens by the electromagnetic force generated by energizing the carrier, and the carrier 7 is formed with a through hole 7c in the optical axis direction of the lens, between the base 5 and the frame 6. A damage preventing member 15 is provided, and the damage preventing member 15 is inserted into the carrier through hole 7c to prevent the carrier 7 from being damaged.
[Selection] Figure 1

Description

  The present invention relates to a lens driving device.

  Patent Document 1 includes a carrier that holds a lens, a coil, a magnet, and a spring that supports the carrier, and a current flows through the coil so that the carrier is against the urging force of the spring and the optical axis of the lens. A technique for moving in a direction is disclosed.

JP 2004-280031 A

  However, in the prior art described in the above-mentioned Patent Document 1, since the carrier is only supported by the base and the frame by the spring, the cellular phone incorporating the lens driving device is dropped, and a large impact is applied to the lens driving device. In such a case, the carrier may be displaced laterally due to the impact, and the carrier may collide with the inner wall of the base or the frame, which may damage the coil, the spring, and the carrier itself.

  In addition, when a lateral force acts on the carrier and the position of the carrier shifts, the clearance between the carrier and the base cannot be maintained constant, and sliding friction occurs between the outer peripheral surface of the carrier and the inner peripheral surface of the base. Occurs, and it becomes difficult for the carrier to move smoothly in the optical axis direction of the lens.

  An object of this invention is to obtain the lens drive device excellent in impact resistance.

  In order to solve the above-mentioned problem, the invention described in claim 1 includes a carrier including a lens, a spring that supports the carrier with respect to the base and the frame, a coil, and a magnet. The lens driving device moves the carrier in the optical axis direction of the lens by the generated electromagnetic force, and the carrier has a through hole in the optical axis direction of the lens, and a damage preventing member is provided between the base and the frame. It is provided and the damage prevention member is inserted in the carrier through-hole to prevent the carrier from being damaged.

  According to a second aspect of the present invention, in the first aspect of the present invention, the base and the frame are each formed with a fitting recess for fixing the damage prevention member, and one end of the damage prevention member is formed at the base. The other end of the damage preventing member is fitted in the fitting recess of the frame, and the carrier is sandwiched and fixed between the base and the frame.

  The invention described in claim 3 includes a carrier including a lens, a spring that supports the carrier with respect to the base and the frame, a coil, and a magnet. The carrier is attached to the lens by electromagnetic force generated by energizing the coil. A lens driving device that moves in the optical axis direction. The carrier has a through hole in the optical axis direction of the lens, the base and the frame are made of resin, and the frame projects in the optical axis direction of the lens. Frame-side protrusions are integrally formed, and base-side protrusions are integrally formed on the base so as to protrude in the optical axis direction of the lens. The frame-side protrusions and the base-side protrusions are arranged in the through holes of the carrier. It is characterized by preventing damage.

  According to the first aspect of the present invention, since the damage preventing member is inserted into the through hole of the carrier, the damage preventing member comes into contact with the carrier through hole even when a large impact is applied to the lens driving device. In the horizontal direction is restricted. Therefore, it is possible to prevent the problem that the carrier collides with the inner wall of the base or the frame, the coil, the spring, the carrier itself is damaged, or the carrier is difficult to move smoothly in the optical axis direction of the lens, and has excellent impact resistance. A lens driving device can be obtained.

  According to the second aspect of the present invention, the same effect as that of the first aspect of the present invention can be achieved, and when the lens driving device is assembled, the carrier penetrates the damage preventing member fitted in the fitting recess of the base. Since the carrier is assembled by inserting the holes, it is not necessary to align the carrier at the time of assembly, and manufacturing is easy.

  According to the third aspect of the present invention, since the frame side protrusion and the base side protrusion are positioned in the through hole of the carrier, the frame side protrusion is inserted into the carrier through hole even when a large impact is applied to the lens driving device. In addition, the base-side protrusion comes into contact with the carrier, and the lateral displacement of the carrier is restricted. Therefore, it is possible to prevent the problem that the carrier collides with the inner wall of the base or the frame, the coil, the spring, the carrier itself is damaged, or the carrier is difficult to move smoothly in the optical axis direction of the lens, and has excellent impact resistance. A lens driving device can be obtained.

  At the time of assembling the lens driving device, the carrier through hole is inserted into the base-side protrusion and the carrier is assembled. Therefore, it is not necessary to align the carrier at the time of assembly, and the manufacturing is easy.

  Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 is a plan view showing a state where a frame and a lens of a lens driving device mounted in the present embodiment are removed, and FIG. 2 is a cross-sectional view of the lens driving device according to FIG.

  The lens driving device 1 according to the present embodiment is incorporated in an autofocus lens of a mobile phone, and includes a substantially U-shaped yoke 3, a base 5 on which the yoke 3 is mounted, a frame 6 that supports the base 5, The carrier 7 disposed on the inner peripheral side of the yoke 3, the coil 10 disposed on the outer peripheral side of the carrier 7, two damage preventing members 15 that prevent damage due to shaking of the carrier 7, and the optical axis of the carrier 7 A front spring 9 disposed at a position on the front side in the direction and a rear spring 11 disposed at a position on the rear side in the optical axis direction of the carrier 7 are provided.

  The yoke 3 has a substantially U-shaped cross section, and a plate-like magnet 13 is disposed in the U-shape.

  The base 5 is made of resin and has a substantially box shape including a substantially flat base portion 5a and a side plate portion 5b provided upright on the base portion 5a. The base portion 5 a includes a circular opening hole 5 c and a base side fitting recess (fitting recess) 17 into which one end 15 a of the damage preventing member 15 is fitted. The base-side fitting recess 17 is provided at a position on a diagonal line across the opening hole 5c.

  The frame 6 is lid-shaped and made of resin, and is fitted into the base 5. A frame-side fitting recess (fitting recess) 19 into which the other end 15 b of the damage preventing member 15 is fitted is provided on the surface of the frame 6 on which the carrier 7 is disposed. The frame-side fitting recess 19 is formed at a position facing the base-side fitting recess 17 formed on the base side.

  The damage preventing member 15 is made of metal and has a cylindrical shape. The damage preventing member 15 has one end 15 a fitted in the base-side fitting recess 17 and the other end 15 b fitted in the frame-side fitting recess 19.

  The carrier 7 has a substantially cylindrical shape, and includes a lens mounting portion 7a to which a lens body is fixed, and a through-hole forming portion 7b that protrudes outward in the radial direction of the lens mounting portion 7a. A carrier through hole 7c is formed in the through hole forming portion 7b in the optical axis direction of the lens, and the damage preventing member 15 is located in the carrier through hole 7c. The inner diameter of the carrier through hole 7 c is slightly larger than the outer diameter of the damage preventing member 15.

  The front spring 9 is a plate spring having a substantially circular shape in plan view, and includes a ring-shaped annular portion 9a and an arm portion 9b formed to project outward in the radial direction of the annular portion 9a. The annular portion 9 a of the front spring 9 is fixed to the front end portion of the carrier 7 in the optical axis direction, and the arm portion 9 b is fixed by being sandwiched between the yoke 3 fixed to the base 5 and the frame 6.

  The rear spring 11 is a plate spring having a substantially circular shape in plan view, and includes a ring-shaped annular portion 11a and an arm portion 9b formed to project outward in the radial direction of the annular portion 11a. The annular portion 11 a of the rear spring 11 is fixed to the rear end portion of the carrier 7 in the optical axis direction, and the arm portion 11 b is fixed between the yoke 3 fixed to the base 5 and the base 6. .

  Next, operations and effects of the lens driving device according to the present embodiment will be described. In assembling the lens driving device 1, the yoke 3 and the magnet 13 are attached to the base 5, and the damage preventing member 15 is fitted into the base side fitting recess 17. Then, after attaching the coil 10 and the rear spring 11 to the carrier 7, the carrier through hole 7 c is inserted into the standing damage prevention member 15 and the carrier 7 is assembled to the base 5. Then, the front spring 9 is assembled to the carrier 7 and the frame 6 is covered. The lens body is screwed and fixed to the carrier 7, and the assembly of the lens driving device 1 is completed.

  In the lens driving device 1 after the assembly is completed, when a voltage is applied to the coil 10, the carrier 7 moves in the axial direction of the damage prevention member 15 by an electromagnetic force induced by a current flowing through the coil 10 and a magnetic field formed by the magnet 13. Moving.

  In this embodiment, since the damage prevention member 15 is inserted into the carrier through hole 7c, even when a large impact is applied to the lens driving device 1, the damage prevention member 15 contacts the carrier through hole 7c and the carrier 7 Large displacement in the lateral direction is restricted. This prevents the carrier 7 from colliding with the inner wall of the base 5 and damaging the coil 10, the springs 9 and 11, and the carrier 7 itself, or making it difficult for the carrier 7 to move smoothly in the optical axis direction of the lens. In addition, a lens driving device having excellent impact resistance can be obtained.

  When assembling the lens driving device 1, the carrier 7 is assembled by inserting the carrier through hole 7 c into the damage preventing member 15 fitted in the base side fitting recess 17 formed in the base 5. Is easy to manufacture.

  Next, other embodiments will be described. In the following description, parts having the same functions and effects as those of the first embodiment described above are denoted by the same reference numerals, and detailed description of the parts is given. In the following description, differences from the first embodiment will be mainly described.

  As shown in FIG. 3, in the second embodiment, the frame 6 is integrally formed with a frame-side projection 21 that projects in the optical axis direction of the lens, and the base 5 projects in the optical axis direction of the lens. The base side protrusion 23 is integrally formed. And the frame side protrusion 21 and the base side protrusion 23 are arrange | positioned in the carrier through-hole 7c, and the damage of the carrier 7 is prevented. The projecting lengths of the frame-side protrusion 21 and the base-side protrusion 23 may be as long as the stroke of the carrier 7.

  According to the present embodiment, since the frame-side protrusion 21 and the base-side protrusion 23 are located in the carrier through hole 7c, even when a large impact is applied to the lens driving device 1, the frame side protrusion is inserted into the carrier through hole 7c. 21 and the base-side protrusion 23 come into contact with each other, and the lateral displacement of the carrier 7 is restricted. This prevents the carrier 7 from colliding with the inner wall of the base 5 and damaging the coil 10, the springs 9 and 11, and the carrier 7 itself, or making it difficult for the carrier 7 to move smoothly in the optical axis direction of the lens. In addition, a lens driving device having excellent impact resistance can be obtained.

  When the lens driving device 1 is assembled, the carrier through-hole 7c is inserted into the base-side protrusion 23 and the carrier 7 is assembled. Therefore, it is not necessary to align the carrier 7 at the time of assembly, and manufacturing is easy.

  Needless to say, the present invention is not limited to the above-described embodiment, and can be variously modified without departing from the scope of the invention.

  In the first embodiment described above, the two damage preventing members 15 are inserted into the carrier 7, but three or more members may be used.

  The cross-sectional shape of the carrier through-hole 7c is not limited to a circular shape, and may be a long hole shape.

  The lens driving device 1 is not limited to a camera related to a mobile phone, but may be used for a digital camera.

It is a top view which shows the state which took the flame | frame and lens of the lens drive device mounted in 1st Embodiment. It is AA sectional drawing of the lens drive device shown in FIG. It is sectional drawing which cut | disconnects and shows the lens drive device which concerns on 2nd Embodiment in the same position as AA of the lens drive device shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Lens drive device 3 Yoke 5 Base 6 Frame 7 Carrier 9 Front side spring (spring)
10 coil 11 rear spring (spring)
13 Magnet 15 Damage prevention member 15a One end 15b The other end 17 Base side fitting recess (fitting recess)
19 Frame side fitting recess (fitting recess)
21 Frame side protrusion 23 Base side protrusion

Claims (3)

  A lens driving device that includes a carrier including a lens, a spring that supports the carrier with respect to the base and the frame, a coil, and a magnet, and moves the carrier in the optical axis direction of the lens by electromagnetic force generated by energizing the coil. In addition, a through hole is formed in the optical axis direction of the lens in the carrier, and a damage preventing member is provided between the base and the frame. A lens driving device characterized by preventing damage.   The base and the frame are each provided with a fitting recess for fixing the damage prevention member. One end of the damage prevention member is fitted into the fitting depression of the base, and the other end of the damage prevention member is fitted into the frame. The lens driving device according to claim 1, wherein the lens driving device is fitted into the fitting recess and fixed with the carrier sandwiched between the base and the frame. A lens driving device that includes a carrier including a lens, a spring that supports the carrier with respect to the base and the frame, a coil, and a magnet, and moves the carrier in the optical axis direction of the lens by electromagnetic force generated by energizing the coil. The carrier has a through hole in the optical axis direction of the lens, the base and the frame are made of resin, and the frame is integrally formed with a projection on the frame side that projects in the optical axis direction of the lens. The base is integrally formed with a base-side protrusion that protrudes in the direction of the optical axis of the lens, and the frame-side protrusion and the base-side protrusion are arranged in the through hole of the carrier to prevent damage to the carrier. A lens driving device.

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