JP2006234866A - Lens drive device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lens drive device that is easy to manufacture and of which the manufacturing time is shortened. <P>SOLUTION: The lens drive device 1 includes: an approximately cylindrical yoke 3; a base 5 and frame 6 disposed on the periphery of the yoke 3; a lens support 7; a magnet 13 attached to the base 5; and a coil 10 attached to the lens support 7. The lens support 7 is moved in the direction of the optical axis of the lens by electromagnetic force generated by supply of power to the coil 10. The base 5 and the frame 6 are connected by a plurality of connecting parts 21 and 25. The internal face 21a of the connecting part 21 on the base side and the internal face 25a of the connecting part 25 on the frame side have projections 23 and projections 27 respectively, which are disposed in firm contact with the peripheral face 3a of the yoke 3. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a lens driving device.

  In Patent Document 1, in a lens driving device including a substantially cylindrical yoke and a base and a frame disposed on the outer periphery of the yoke, the yoke is sandwiched between the base and the frame from above and below, and the yoke is attached to the base and the frame. Attached is disclosed.

JP 2004-280031 A

  Although not particularly disclosed in the prior art described in Patent Document 1 above, an adhesive is generally used between the yoke and the base and between the yoke and the frame in order to prevent rattling and displacement due to external impact. And the yoke was fixed. However, there is a problem that an adhesive filling operation is required at the time of manufacturing, and an extra manufacturing time is required for the time required for the adhesive to cure.

  An object of the present invention is to obtain a lens driving device that can be easily manufactured and can reduce the manufacturing time.

  In order to solve the above-mentioned problems, the invention described in claim 1 includes a substantially cylindrical yoke, a base and a frame disposed on the outer periphery of the yoke, a lens support, a magnet attached to the base, and a lens. A lens driving device for moving the lens support in the optical axis direction of the lens by electromagnetic force generated by energizing the coil, and the base and the frame are connected to each other by a plurality of connecting portions. In addition, the inner peripheral surface of the base-side connecting portion and the inner peripheral surface of the frame-side connecting portion are provided with protrusions that press against the outer peripheral surface of the yoke.

  The invention described in claim 2 is characterized in that, in the invention described in claim 1, the protrusion has an arc shape with a transverse section protruding on the inner peripheral side.

  According to a third aspect of the present invention, in the first or second aspect of the present invention, the base-side protruding portion is inclined with the side end portion inclined with the yoke side down, and the frame-side protruding portion is on the side. The end portion is inclined with the yoke side facing upward.

  According to the first aspect of the present invention, when assembling the yoke at the time of manufacturing the lens driving device, the yoke is sandwiched between the base and the frame from above and below, and the yoke is press-fitted and fixed to the base and the frame. .

  In the present invention, the yoke can be fixed to the base and the frame by pressure contact between the inner peripheral surface of the base-side connecting portion and the protrusion provided on the inner peripheral surface of the frame-side connecting portion. Therefore, it is possible to fix the yoke to the base and the frame without using an adhesive as in the prior art, and it is easy to manufacture without requiring an adhesive filling operation at the time of manufacture. It can be shortened.

  Since no adhesive is required, the number of parts can be reduced by the amount of adhesive, and the manufacturing cost can be reduced.

  Since the yoke is fixed to the base and the frame by pressure contact, even when an impact is applied from the outside, the yoke is unlikely to shake or rattle.

  According to the second aspect of the present invention, the same effect as that of the first aspect of the invention can be obtained, and the protrusion is formed in an arc shape projecting on the inner peripheral side. Since the protrusions are in point contact, the friction between the protrusion and the outer peripheral surface of the yoke is smaller than in the case of surface contact, and the yoke can be pushed in smoothly.

  According to the invention described in claim 3, the same effect as that of the invention described in claim 1 or 2 can be obtained, and the protruding portion on the base side is inclined with the side end on the yoke side downward. Therefore, when the yoke is press-fitted into the base, the protrusion slides along the inclination, so that the yoke can be press-fitted smoothly. Similarly, since the projections on the frame side are inclined with the yoke end on the upper side, the projection slides along the inclination when the yoke is pressed into the frame, and the yoke is pressed smoothly. it can.

  Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. 1A and 1B are views showing the base shown in FIG. 4 in an extracted manner, wherein FIG. 1A is a perspective view showing the whole base, FIG. 1B is a cross-sectional view taken along the line A-A shown in FIG. FIG. 2 is a perspective view of the frame shown in FIG. 4 viewed from the inner peripheral side, and FIG. 3 is a perspective view showing a state in which the lens driving device according to the present embodiment is cut in the vertical direction. 4 and 4 are exploded perspective views of the lens driving device according to the present embodiment.

  A lens driving device 1 according to the present embodiment is incorporated in an autofocus lens of a cellular phone, and includes a substantially cylindrical yoke 3, a base 5 disposed on the outer periphery of the yoke 3, and a frame 6 that supports the base 5. The lens support 7 disposed on the inner peripheral side of the yoke 3, the coil 10 disposed on the outer peripheral side of the lens support 7, and the front spring 9 and the rear spring 11 disposed in the front-rear direction of the lens support 7. And. The lens support 7 has a substantially cylindrical shape, and a lens 12 is fixed therein.

  The yoke 3 has a substantially U-shaped cross section, and a ring-shaped magnet 13 is disposed in the U-shape. The magnet 13 has a ring shape and is divided into four arc-shaped blocks along the circumferential direction.

  The base 5 is made of resin, and is provided with connecting portions 21 to the frame 6 in a shape along the outer periphery of the yoke 3, and the connecting portions 21 stand at the four corners of the base 5. On the inner peripheral surface 21 a of each connecting portion 21, a strip-shaped protrusion 23 that is in pressure contact with the outer peripheral surface 3 a of the yoke 3 is formed. Further, an engaging portion 24 that engages with the engaged portion 29 of the frame 6 is formed on the outer periphery of the connecting portion 21.

  The base-side protruding portion 23 has an arc shape with a transverse section protruding toward the inner peripheral side, and the protruding portion 23 a is in contact with the outer peripheral surface 3 a of the yoke 3. Further, the side end portion 23a of the base-side protrusion 23 is formed obliquely with the yoke side facing downward.

  The frame 6 is made of resin, and is provided with connecting portions 25 to the base 5 in a shape along the outer periphery of the yoke 3, and the connecting portions 25 are erected at the four corners of the frame 6. A strip-shaped protrusion 27 is formed on the inner peripheral surface 25 a of each connecting portion 25.

  The projecting portion 27 on the frame side has an arc shape with a transverse section projecting to the inner peripheral side, and the projecting portion is in contact with the outer peripheral surface 3 a of the yoke 3. Further, the side end 27a of the projection 27 on the frame side is formed obliquely with the yoke side up.

  An engaged portion 29 that engages with the engaging portion 24 of the base 5 is formed on the outer periphery of the connecting portion 25.

  Next, assembly and operation effects of the lens driving device according to the present embodiment will be described. The lens driving device 1 is assembled by attaching the rear spring 11 to the lens support 7, placing the magnet 13 and the coil 10 fixed to the lens support 7 inside the yoke 3, and the base portion 5 a of the base 5. Are assembled via the rear spacer 16. Then, the inner peripheral end of the front spring 9 is placed between the front spacer 18 and the yoke 3 and fixed with the cap 15, and the frame 6 is attached to the base 5, and the outer peripheral end of the front spring 9 is fixed. Fix with frame 6.

  When the yoke 3 is assembled, the yoke 3 is sandwiched between the base 5 and the frame 6 from above and below the yoke 3, and the yoke 3 is fixed to the base 5 and the frame 6 by press-fitting. Thereafter, the engaged portion 29 of the frame 6 is engaged with the engaging portion 24 of the base 5 to fix the base 5 and the frame 6.

  In the present embodiment, the yoke 3 is brought into contact with the base 5 and the frame 6 by the pressure contact of the protrusions 23 and 27 provided on the inner peripheral surface 21a of the base-side connecting portion 21 and the inner peripheral surface 25a of the frame-side connecting portion 25. Can be fixed. Therefore, the yoke 3 can be fixed to the base 5 and the frame 6 without using an adhesive as in the prior art, and an adhesive filling operation is unnecessary at the time of manufacturing, and the manufacturing is easy, and the curing time of the adhesive is unnecessary. Manufacturing time can be shortened.

  Since no adhesive is required, the number of parts can be reduced by the amount of adhesive, and the manufacturing cost can be reduced.

  Since the yoke 3 is fixed by pressure contact, it is difficult for the yoke 3 to sway or rattle even when subjected to an impact from the outside.

  Since the protrusions 23 and 27 are substantially semicircular and projecting on the inner peripheral side, the protrusions 23 and 27 are in point contact with the outer peripheral surface 3 a of the yoke 3. Friction with the outer peripheral surface 3a of the yoke 3 is small, and the yoke 3 can be pushed in smoothly.

  Since the side end portion 23b is inclined with the yoke side down, the base-side protruding portion 23 slides along the inclined surface when the yoke 3 is press-fitted into the base 5, and the yoke 3 Can be pressed in smoothly. Similarly, since the projection 27 on the frame side is inclined with the side end portion 27a facing the yoke side up, the projection 27 slides along the inclination when the yoke 3 is press-fitted into the frame 6, The yoke 3 can be press-fitted smoothly.

  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 above-described embodiment, two or more protrusions 23 may be provided in one connecting portion 21.

  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 figure which extracts and shows the base shown in FIG. 4, (a) is a perspective view which shows the whole base, (b) is AA sectional drawing shown to (a), (c) is B shown to (a). It is -B sectional drawing. It is the perspective view which looked at the flame | frame shown in FIG. 4 from the inner peripheral side. It is a perspective view of the lens drive device concerning this embodiment cut in the lengthwise direction. It is a disassembled perspective view of the lens drive device concerning this embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Lens drive device 3 Yoke 3a (Yoke's) outer peripheral surface 5 Base 6 Frame 7 Lens support body 10 Coil 13 Magnet 21 Base side connection part 21a Inner peripheral surface 23 Base side projection part 25 Frame side connection part 25a Inner circumference Surface 27 Projection on the frame side

Claims (3)

  An electromagnetic force generated by energizing the coil, comprising a substantially cylindrical yoke, a base and frame disposed on the outer periphery of the yoke, a lens support, a magnet attached to the base, and a coil attached to the lens support. The lens driving device moves the lens support in the optical axis direction of the lens, and the base and the frame are connected to each other by a plurality of connecting portions, and the inner peripheral surface of the connecting portion on the base side and the connecting on the frame side A lens driving device characterized in that a protrusion is provided on the inner peripheral surface of the part so as to be in pressure contact with the outer peripheral surface of the yoke.   The lens driving device according to claim 1, wherein the protrusion has an arc shape whose cross section protrudes toward the inner peripheral side.   2. The protrusion on the base side is inclined with the side end portion inclined with the yoke side down, and the protrusion on the frame side is inclined with the side end portion on the yoke side upward. Or the lens drive device of 2.

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