JP2008058946A - VOICE COIL MOTOR TYPE mp FOCUSING ACTUATOR - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a voice coil motor type focusing actuator capable of enhancing focusing accuracy and lowering a failure rate. <P>SOLUTION: A fixed mount unit includes a fixed frame 20 and four magnets M, and the fixed frame 20 is metallic formed substance covered with plastic injection molding, then the magnets M are respectively installed inside the fixed frame 20. A movable mount unit is provided in the fixed frame 20 and includes a lens attaching barrel 30 inside which a lens is provided and a coil 40 installed on the outside. A load cover unit 80 is used to attach the fixed mount unit. Two elastic members 50 elastically support the fixed mount unit and the movable mount unit. The lens attaching barrel 30 can accurately slide, whereby the focusing accuracy is enhanced and the failure rate is lowered. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a voice coil motor, and more particularly to a voice coil motor type focusing actuator.

  A conventional voice coil motor type focusing actuator mainly includes a fixed frame and a lens mounting cylinder that can be movably mounted in the fixed frame. However, the structure of these voice coil motor type focusing actuators is too complicated, resulting in a detailed and cumbersome assembly process and a waste of time spent for the assembly. Furthermore, this structure coupling method is still another, which leads to lack of structural stability. In addition, there is a possibility that foreign matters such as dust are easily invaded. Therefore, improvement is awaited.

In view of the above-mentioned drawbacks, the inventor has made extensive studies and has obtained the voice coil motor type focusing actuator of the present invention.
The main object of the present invention is to provide a voice coil motor type in which the lens mounting cylinder can be smoothly and accurately slid in accordance with the fixed frame, the focusing accuracy can be improved, and the failure rate can be reduced. It is to provide a focusing actuator.
The second object of the present invention is to provide a voice coil motor type focusing actuator that provides a better elastic support effect between the lens mounting cylinder and the fixed frame because it has a better elasticity recovery action.

  In order to achieve the above-described object, the voice coil motor type focusing actuator provided by the present invention can be mounted with a lens and an image detection component, and includes a fixed mounting unit, a movable mounting unit, a load cover unit, One elastic member. The fixed mounting unit includes a fixed frame and four magnets, and the fixed frame is a metal formation covered with plastic injection molding. Each of the magnets is installed inside the fixed frame. The movable mounting unit is provided in the fixed frame, and includes a lens mounting cylinder in which the lens is disposed inside, and a coil disposed on the outside. The fixed mounting unit is attached to the load cover unit, and the two elastic members elastically support the fixed mounting unit and the movable mounting unit.

The structure, features, and effects of the present invention will be described below with reference to the drawings and more preferred embodiments.
First, referring to FIG. 1 to FIG. 9, a voice coil motor type focusing actuator provided by an embodiment of the present invention is used for mounting a lens and an image detection component (not shown). Including.
The front cover plate 10 is formed at a corner opposite to the bottom plate 11, a bottom plate 11 in which a relief hole 13 is formed at a central position, two through holes 15 provided on both sides opposite to the escape hole 13, and the bottom plate 11. And two first push-pull portions 17 located on the bottom side of the bottom plate 11 and two fitting grooves 19 formed on the side surface facing the two first push-pull portions 17.

  The fixed frame 20 has a substantially quadrangular shape, and is composed of a frame main body 21 made of a metal molding 211 covered with plastic injection molding, a receiving space 22 formed at a central position of the frame main body 21, and an inner side of the frame main body 21. Four magnetic installation portions 23 formed on the wall surface and exhibiting a substantially concave shape, four slide portions 24 positioned at four corners inside the frame body 21 and interposed between the magnetic installation portions 23, Two first fitting portions 25 formed at opposite corners on the top side of the frame main body 21, and formed on the side surfaces of the first fitting portions 25, respectively, and each first push of the front cover plate 10. Two convex pieces 251 that can be fitted into the fitting groove 19 of the pulling portion 17, four second fitting portions 26 formed at the bottom corners of the frame body 21, and the respective second fittings. Provided with four convex pieces 261 formed on the 26 side of, and four connecting cap 27 disposed on the bottom side of the second fitting portion 26 of the frame body 21.

The four magnets M are located at the respective magnetic installation portions 23 of the fixed frame 20, and the magnets M and the fixed frame 20 can constitute a fixed frame mounting unit.
The lens mounting cylinder 30 is a cylindrical body 31 accommodated and installed in the accommodating space 22 of the fixed frame 20, a lens mounting part 32 that is juxtaposed to the cylindrical body 31 as a screw hole, and for mounting the lens. Four connecting caps 34 that are installed on the top side of the cylindrical body 31 and in which the lens mounting portion 32 is circularly arranged, a coil winding part 35 that is formed outside the cylindrical body 31, and the cylindrical body, respectively. Eight abutting portions 36 that are formed at end angles on the outer side, press against the slide portions 24 of the fixed frame 20, and allow the lens mounting cylinder 30 to slide in the accommodation space 22 of the fixed frame 20. Prepare.
The two rod members S penetrate through the respective through holes 15 of the front cover plate 10 and the through holes 33 of the lens mounting cylinder 30 which face each other.

The coil 40B is wound on the outer side of the winding portion 35B of the lens mounting cylinder 30B by a conductive wire, and has a substantially quadrangular ring shape. The coil 40B and the lens mounting cylinder 30B can constitute a movable mounting unit.
The two elastic members 50 are respectively opened at both ends of the connecting portion 51, and two first through holes 52 used for installing the connecting portion 51 and the connecting caps 27 of the frame body 21, respectively. Two elastic members 53 that are provided at both ends of each of the connecting portions 51 and are used for the lens mounting cylinder 30 to perform a return movement, and adjacent to the first through holes 52, and the elastic members 53, respectively. Four second through-holes 54 that are established and used to cover the connection caps 34 of the lens mounting cylinder 30, and connection terminals 55 that are formed by extending along the connection portions 51, respectively. Is provided.

  The rear cover plate 70 is opened at four opposite corners of the bottom plate 71 in which a relief hole 72 is formed at a central position, and four connecting corners 27 of the frame main body 21. Two through-holes 73 and two fitting grooves 75 which are provided on the side surfaces of the respective second push-pull portions 74 and are used for fitting with the convex pieces 261 of the respective second fitting portions 26 of the fixed frame 20. And two concave grooves 76 which are opened on the side surface of the bottom plate 71 and can accommodate the conductive terminal 55.

  The load cover 80 is installed on the fixed frame 20, is arranged side by side on the bottom side of the rear cover plate 70, and a cover main body 81 on which the image detection component can be mounted, and a relief opened at the center position of the cover main body 81. A hole 82, two third push / pull portions 83 formed at corners facing the top side of the cover body 81, and two fitting grooves formed on the side faces of the third push / pull portions 83, respectively. 84 and two through holes 85 which are opened on one side of the cover main body 81 and are used to pass through the conductive terminals 55 of the elastic members 50 and which correspond to the concave grooves 76 of the rear cover plate 70. The fitting grooves 84 of the third push / pull portions 83 of the load cover 80 can be fitted in correspondence with the convex pieces 261 of the second fitting portions 26 of the fixed frame 20, respectively. The load cover 80, the front cover plate 10, and the rear cover plate 70 constitute a load cover unit.

  In the operation of this embodiment, a current is applied to the coil 40, and each corresponding magnet M produces a magnetic effect. In other words, the lens mounting cylinder 30 presses the abutting portion 36 against each slide portion 24 of the fixed frame 20 to make a substantially local contact, and friction between the lens mounting cylinder 30 and the fixed frame 20 is achieved. Can be reduced. At the same time, the lens mounting cylinder 30 is guided by the two rod members S, and the linear operation can be accurately performed. In addition, when the coil 40 is not energized, the elastic member 50 allows the lens mounting cylinder 30 to move to return to the original position relative to the fixed frame 20.

  As a result, the lens mounting cylinder of the voice coil motor type focusing actuator of the present embodiment can slide smoothly and accurately corresponding to the fixed frame, increasing the focusing accuracy and reducing the failure rate. be able to. The method of operating the present embodiment simplifies the assembly of the fixed mounting unit and the load cover unit and has a feature that is simplified in its structure. Furthermore, the fixed mounting unit of the present embodiment is provided with a magnet by a method arrangement having a substantially rectangular shape, and can provide a more excellent magnetic field sensitivity effect.

Referring to FIG. 10, a voice coil motor type focusing actuator provided by another embodiment of the present invention is substantially the same in structure as the above-described embodiment, and the differences are as follows.
The fixed frame 20A includes four slide portions 24A as guide grooves, and eight connecting caps 27A are provided at corners facing the frame main body 21A.
The lens mounting cylinder 30A includes eight abutting portions 36A serving as protrusions, presses against the slide portions 24A of the fixed frame 20A, and allows the lens mounting cylinder 30A to slide within the fixed frame 20A. it can.

  The elastic member 50A is two members arranged in parallel on both sides of the fixed frame 20A. The elastic member 50A is opened at a connection portion 51A having a substantially rectangular shape and a bending portion of the connection portion 51A. Eight first through-holes 52A used for installing each connecting cap 27A, four elastic portions 53A provided inside the bent portion of the connecting portion 51A, and one end of each elastic portion 53A The four second through holes 54A used for fitting the connecting caps 34A of the lens mounting cylinder 30A so that the lens mounting cylinder 30A can perform a return movement, and are connected to the connecting portions 51A, respectively. Two conducting terminals 55A and a conducting terminal 56A are provided.

The load cover 80A includes a cover main body 81A and two concave grooves 85A which are provided on one side of the cover main body 81A and are used for projecting the conductive terminal 55A and the conductive terminal 56A.
As a result, this embodiment can achieve the same effect as that of the first embodiment, further uses the fitting groove method, simplifies the assembly of the fixed mounting unit and the load cover unit, and requires a rod member. Features a simplified structure that does not.

Referring to FIG. 11, a voice coil motor type focusing actuator provided by still another embodiment of the present invention is substantially the same as the above-described embodiment, and the differences are as follows. .
The fixed frame 20B is a concave groove, and includes two slide portions 24B provided inside the frame main body 21B and two conductive terminals installed on the bottom side of the frame main body 21B.

The lens mounting cylinder 30B has a generally circular winding part 35B and a rod shape, presses against each slide part 24B of the fixed frame 20B, and slides the lens mounting cylinder 30B within the fixed frame 20B. And four abutting portions 36B that can be used.
The coil 40B is wound around the winding portion 35B of the lens mounting cylinder 30B by a conducting wire and has a substantially circular shape.

  The elastic member 50B is composed of four connecting portions 51B each having a substantially L shape, and is opened where the first through-hole 52B is bent, and each connecting terminal 27B of the frame main body 21B is installed. The connecting portion 51B used for the above-described purpose is formed in an L-shape, two elastic portions 53B provided at both ends of each connecting portion 51B, and the bent portions of each elastic portion 53B. 30B and two through holes 54B used for fitting each connecting cap 34B. The elastic members 50B are provided on both sides of the fixed frame 20B as a pair.

The load cover 80B includes two through holes 85B that are used to project the conductive terminals 27B provided at opposite end angles on the bottom side of the cover body 81B.
As a result, the present embodiment can achieve the same effect as the above-described one embodiment, and can be used as a connection cap by operating the connection terminal of the fixed mounting unit. As a feature.

From the above description of the embodiments, the characteristics of the present invention are attributed to the following.
1. The voice coil motor type focusing actuator of the present invention corresponds to a fixed frame, and the lens mounting cylinder can smoothly and accurately slide, so that focusing accuracy can be improved and the failure rate can be reduced.
2. The voice coil motor type focusing actuator of the present invention uses the method of the fitting groove, simplifies the assembly of the fixed mounting unit and the load cover unit, and has a simplified structure as a feature.

3. The voice coil motor type focusing actuator of the present invention can provide an effect of better magnetic field sensitivity to the fixed mounting unit by arranging the magnet in a generally rectangular design.
4). The voice coil motor type focusing actuator of the present invention is characterized in that the rod member of the fixed mounting unit enhances the stability of the structure and ensures smooth sliding.
5. The voice coil motor type focusing actuator of the present invention is characterized by a simplified structure in which the connecting terminal of the fixed mounting unit also serves as a connecting cap.

1 is a perspective view showing a voice coil motor type focusing actuator according to an embodiment of the present invention. It is a perspective view showing a voice coil motor type focusing actuator according to another embodiment of the present invention. 1 is an exploded perspective view showing a voice coil motor type focusing actuator according to an embodiment of the present invention. It is the disassembled perspective view seen from another angle of the voice coil motor type focusing actuator by one example of the present invention. It is a schematic diagram showing a voice coil motor type focusing actuator according to an embodiment of the present invention. FIG. 6 is a cross-sectional view of FIG. 1 cut along line 6-6. FIG. 7 is a cross-sectional view of FIG. 1 taken along line 7-7. It is sectional drawing which cut | disconnected FIG. 1 by the 8-8 line. FIG. 9 is a cross-sectional view of FIG. 1 taken along line 9-9. FIG. 6 is an exploded perspective view showing a voice coil motor type focusing actuator according to another embodiment of the present invention. FIG. 6 is an exploded perspective view showing a voice coil motor type focusing actuator according to still another embodiment of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Front cover plate, 11 Bottom plate, 13 Relief hole, 15 Through-hole, 17 1st push-pull part, 19 Insertion groove, 20 Fixed frame, 20A Fixed frame, 20B Fixed frame, 21 Frame main body, 21A Frame main body, 21B Frame main body , 22 accommodating space, 23 magnetic installation part, 24 slide part, 24A slide part, 24B slide part, 25 first fitting part, 26 second fitting part, 27 connecting cap, 27A connecting cap, 27B conducting terminal, 30 Lens mounting cylinder, 30A Lens mounting cylinder, 30B Lens mounting cylinder, 31 cylinder, 32 lens mounting section, 33 through hole, 34 coupling cap, 34B coupling cap, 35 winding section, 35B winding section, 36 contact section, 36A contact part, 36B contact part, 40 coil, 40B coil, 50 elastic support member, 50A elastic support member 50B elastic support member, 51 connecting portion, 51A connecting portion, 51B connecting portion, 52 first through hole, 52A first through hole, 52B first through hole, 53 elastic portion, 53A elastic portion, 53B elastic portion, 54 second Through hole, 54A second through hole, 54B second through hole, 55 conductive terminal, 55A conductive terminal, 56A conductive terminal, 70 rear cover plate, 70A rear cover plate, 71 plate body, 72 escape hole, 73 through hole Hole, 74 Second push / pull part, 75 Fitting groove, 76 Concave groove, 80 Load cover, 80A Load cover, 80B Load cover, 81 Cover body, 81A Cover body, 81B Cover body, 82 Relief hole, 83 Third push / pull Part, 84 fitting groove, 85 through hole, 85A concave groove, 85B through hole, 211 metal molding, 251 convex piece, 261 convex piece, M magnet, S rod member

Claims (5)

In a voice coil motor type focusing actuator for mounting lenses and video detection components,
A fixed frame and four magnets, wherein the fixed frame is a metal molding covered with plastic injection molding, and each of the magnets is fixedly installed on the inside of the fixed frame; and
A movable mounting unit that is provided in the fixed frame and includes a lens mounting cylinder in which the lens is provided inside and a coil installed on the outside;
A load cover unit for mounting the fixed mounting unit;
Two elastic members that elastically support the fixed mounting unit and the movable mounting unit;
A focusing actuator comprising: In a voice coil motor type focusing actuator for mounting lenses and video detection components,
A fixed mounting unit having a fixed frame, four magnets and a plurality of fitting portions, wherein the magnets are respectively installed inside the fixed frame, and the fitting portions are provided outside the frame body;
A movable mounting unit that is provided in the fixed frame and includes a lens mounting cylinder in which the lens is provided inside and a coil installed on the outside;
A plurality of push-pull portions formed at opposite corners of the plate body, and further fitted to each fitting portion of the fixed mounting unit, and a load cover unit used for mounting the fixed mounting unit;
Two elastic members that elastically support the fixed mounting unit and the movable mounting unit;
A focusing actuator comprising: In a voice coil motor type focusing actuator for mounting lenses and video detection components,
A fixed frame having a substantially quadrilateral shape and four magnets, each of the magnets being fixedly mounted on the inside of the fixed frame; and
A movable mounting unit that is provided in the fixed frame and includes a lens mounting cylinder in which the lens is provided inside and a coil installed on the outside;
A load cover for mounting the mounting unit of the fixed frame;
Two elastic members that elastically support the fixed mounting unit and the movable mounting unit;
A focusing actuator comprising: In a voice coil motor type focusing actuator for mounting lenses and video detection components,
A fixed frame, four magnets, two rod members, and two through-holes, each of the magnets being installed inside the fixed frame, the two through-holes penetrating both sides of the fixed frame; A fixed mounting unit in which the through hole is formed in the two rod members;
A movable mounting unit that is provided in the fixed frame and includes a lens mounting cylinder in which the lens is provided inside and a coil installed on the outside;
A load cover for mounting the mounting unit of the fixed frame;
Two elastic members that elastically support the fixed mounting unit and the movable mounting unit;
A focusing actuator comprising: Focusing actuators for mounting lenses and video detection components
A fixed frame, four magnets, two rod members, and two contact terminals, each of the magnets being installed inside the fixed frame, two through holes penetrating both sides of the fixed frame, A fixed mounting unit in which the through hole is formed in two conductive terminals;
A movable mounting unit that is provided in the fixed frame and includes a lens mounting cylinder in which the lens is provided inside and a coil installed on the outside;
A load cover for mounting the mounting unit of the fixed frame;
Two elastic members that elastically support the fixed mounting unit and the movable mounting unit;
A focusing actuator comprising:

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