KR101151371B1 - Driving device for lens - Google Patents

Abstract

The present invention relates to a lens drive device, comprising a yoke ring mounted on a base and having a rectangular outline with a circular hole and also used as an outer frame of the lens drive device, wherein a magnet is provided inside the yoke ring. The lens is provided with a lens holder in the circular hole of the yoke ring, and the front and rear springs with the front pads and the rear springs with the rear pads are provided before and after the lens holder. The strings of the rear springs are symmetrically up, down, left, and right to prevent rotational deviation due to deformation and to prevent the optical axis from generating minute deviation when the lens holder is moved. The non-spacing assembling method of the rear pad and the base of the fitting method prevents foreign matter from entering the inside of the lens driving apparatus. In addition, the magnet consists of a triangular prism and is installed at four corners of the rectangular outer contour of the yoke ring, and the yoke ring, the front and rear pads, the front and rear springs, the lens holder, and the base are all formed and fitted into a flat type structure. The assembly method of the common position process groove is adopted by connecting in such a way. Therefore, the present invention is strong in electromagnetic stress, has excellent electrical and mechanical properties, and the manufacturing and assembly process is not only simple, it is possible to improve the precision and product yield of the product.

Description

Lens Drive {DRIVING DEVICE FOR LENS}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lens drive technology of a camera, and more particularly, to a lens drive device which is professionally used to focus a mini camera and which is resistant to vibration and shock. The present invention is mainly applied to a mini camera having a function of automatically focusing, and at the same time, in combination with a miniaturized and high-definition sensor, it is applied to a mobile phone, a computer, a vehicle, and a robot.

As a device having a relatively general configuration, such as a lens driving device used in conventional miniature cameras at home and abroad, there is, for example, Chinese Patent No. 200410017724.3 "lens driving device". The apparatus includes a cylindrical yoke ring mounted on a base and provided with a magnet and a coil therein, and an inner circumferential surface of the coil is provided with a lens having a lens support. And the magnet and the coil are installed inside the cylindrical yoke ring of the '凹' shape, and the coil is fixed to the outer circumferential surface of the lens support on the inner circumferential surface side of the yoke ring, An outer circumferential surface may extend into the cylindrical yoke ring to move in the '凹' shaped gap of the yoke ring. The lens driving device further includes a ring-shaped front spring seat and rear spring seat having an outer circumferential end thereof fixedly connected to the yoke ring, a small cap that fixes the inner circumferential end of the front spring seat to the lens support, and the front spring seat. It further includes a frame for fixing the outer peripheral surface side end of the yoke ring.

The electromagnetic force generated after the coil is energized is opposed to prepressing the front and rear springs so that the lens support moves in the optical axis direction.

The lens driving device is also installed in the gap between the small cap and the frame to prevent the positional deviation and movement of the lens support and the vertical direction limiter and the gap between the lens support and the yoke ring is installed in the gap And a rotation direction limiting device for preventing movement.

The " lens drive device " utilizes the electromagnetic induction of the magnet to cause the lens support to move by the action of parallel electromagnetic forces and to generate a reaction force on the spring sheets provided on the front and rear sides of the lens support. Thus, when the electromagnetic force acting on the lens support and the elastic force of the spring sheet are in equilibrium, the lens support is kept at a fixed position and achieves the automatic focusing objective of the camera. The demand for the production, assembly, and movement precision of the lens driving device is very high, so that the movement of the lens support through the front and rear sides is limited, thereby realizing a good performance against vibration and shock even under the condition that no other member is added. Although the quality can be maintained, the device has the following disadvantages. First, the shape of the yoke ring is limited due to the space occupied by the outer frame, which affects the electromagnetic sensitive effect and at the same time restricts the development of the product. Second, since the base and the lens support are the bases of assembling precision, the demands on the shape and the position tolerance of the base and the lens support are very high, and the shape of the parts of the base and the lens support is complicated, so Due to high demand, the manufacturing and assembly process is very difficult. Third, the front and rear spring sheets are arranged alternately in the same direction while forming a ring shape, so that the rotational force in the same direction is generated at the same time when the spring is moved in the front and rear direction so that the rotational deviation easily occurs in the lens support. do. Fourth, since the assembly process is complicated and the adhesive assembly process is completed, the accuracy and performance of the product can be measured. Therefore, the pass rate of the product is difficult to control, resulting in waste of resources.

Disclosure of Invention The present invention has been made to solve the problems existing in the prior art, and an object thereof is to provide a lens driving apparatus which increases electromagnetic sensitivity, reduces power driving output, and realizes miniaturization of a product.

As a means for solving the above problems, the lens driving apparatus according to the present invention includes a yoke ring mounted on a base and provided with a magnet and a coil therein, and a lens holder having a lens is installed on an inner circumferential surface of the coil. The lens holder is movable back and forth within the yoke ring, and a lens movement damping device is installed at the front and rear sides of the lens holder to maintain balance and stability during movement of the lens holder, and after the coil is energized. The generated electromagnetic force causes the lens holder to move in the direction of the optical axis against the damping force of the lens shift damping device, and between the lens holder and the yoke ring and also prevents the positional deviation and movement of the lens holder. It is installed. In addition, the yoke ring has a central through hole and has a '凹' shaped cross-sectional structure having a rectangular outer contour, and an inner chamber having a rounded inside and a rectangular outer shape is formed at one side of the '凹' shaped cross section. It is mounted at the corner of the inner chamber which is round inside and square outside.

The use of a yoke ring with a rectangular outer contour is advantageous for placing the magnet in the utilization space of the four corner portions in the yoke ring, thereby increasing the orientation thickness of the magnet, thereby improving electromagnetic stress and minimizing the product. It can reduce the drive output of the power supply and save energy.

Preferably, the lens holder is composed of a cylindrical body having a center through hole, and the outer diameter of the cylindrical body is matched with the center through hole of the yoke ring, and the lens holder is mounted in the center through hole. A rectangular flange is installed at one end, and is matched with an inner end face of the rectangular flange and the central through hole. This configuration is advantageous for fixing the lens holder and the yoke ring in the circumferential direction and the axial direction, and allows the lens holder to move while being guided within the central through hole of the yoke ring. In addition, the difficulty of manufacturing and assembling the lens holder and the yoke ring as a base for implementing the assembly precision can be relatively low.

The lens shift damping device preferably comprises a front spring having a front pad and a rear spring having a rear pad, wherein the front pad is covered on the front wall of the inner chamber. When configured in this way, the lens holder may have excellent performance to withstand vibration and shock, thereby maintaining excellent balance and stability in the process of moving, and thus having excellent screen quality.

According to a further development of the invention, the yoke ring, the front pad, the front spring, the lens holder, the rear spring, and the base are of a flat plate type structure, which use a position fixing device connected to each other in a fitting manner. It is desirable to. Flat type fitting type assembly method is simple assembly process, easy to meet the assembly precision requirements, easy to conduct the electrical characteristics inspection on the finished product and can improve the acceptance rate of the finished product.

The magnet is preferably formed in a triangular prism shape to install four. The four magnets are respectively installed in four corner portions each having a rounded inside and a rectangular outside. Since the triangular prism magnet is matched with the corner space of the yoke ring, excellent electrical and mechanical properties can be obtained.

The position fixing device between the lens holder and the yoke ring includes a plurality of yoke ring circumferential positioning grooves provided in the center through hole of the yoke ring, a plurality of front pad circumferential positioning grooves provided on the front pad, and the front spring. A plurality of front spring circumferential positioning grooves installed in the lens holder, a plurality of lens holder circumferential positioning grooves installed in the lens holder, and a plurality of rear spring circumferential positioning grooves installed in the rear spring; Directional position fixing groove, the front pad circumferential position fixing groove, the front spring circumferential position fixing groove, the lens holder circumferential position fixing groove, and the rear pad circumferential position fixing groove all correspond to each other and for assembly It is matched with the position fixing pin of the clamp. The present invention is the frame of the yoke ring as an assembly reference and at the same time the circumferential position fixing groove as a reference of the position fixing during the progress of the assembly process, the front pad, the front spring, the magnet, the rear pad, the rear spring and the base All are assembled on the same assembly and positioning clamps, increasing assembly accuracy and simplifying the assembly process.

The yoke ring circumferential position fixing groove, the front pad circumferential position fixing groove, the front spring circumferential position fixing groove, the lens holder circumferential position fixing groove, the rear spring circumferential position fixing groove are each configured four Preferably, they are uniformly distributed in the circumferential direction, thereby preventing the positional deviation and movement of the lens holder.

The position fixing device also includes four openings formed in the circular hole of the yoke ring, and a plurality of rib arches formed to penetrate up and down through the outer circumferential surface of the lens holder, and the openings are matched with the rib arches in the process of progress. The positional deviation between the yoke ring and the lens holder is prevented from occurring.

It is preferable that the front spring is composed of a sheet having a rectangular contour, and a front spring circular hole is formed at the center thereof, and a plurality of front spring strings disposed symmetrically with the front spring are installed. The method of symmetrically uniformly distributing the front spring string and the rear spring string has a function of canceling the tangential action force generated when the string is deformed along the optical axis direction, thereby preventing rotation deviation in the lens holder. .

The front spring may be installed between the front pad and the magnet to have more excellent balance and stability in the process of moving the lens holder forward.

It is preferable that the circular hole openings and the rib arches of the yoke ring are each formed four, so that they are symmetrically disposed along the center so that the circumferential position fixing between the yoke ring and the lens holder is performed well.

A preferred method of fixing the front end of the lens holder and the front spring is to form a projection of the lens holder rib arch in the lens holder, and to form a recess in the front spring so that the projection of the lens holder rib arch of the front spring To match the recess. In this way, the purpose of positioning can be achieved.

Similarly, the rear spring is composed of a sheet having a rectangular contour and has a rear spring circular hole formed at the center thereof, a plurality of rear spring strings symmetrical with each other on the rear spring, and a plurality of rear symmetrical ones. A recess is formed, and the rear recess is matched with the lens holder rib arch. This configuration solves the problem that rotational deviation occurs easily when the lens holder moves in the optical axis direction by canceling the rotational force generated when the front and rear springs are moved and deformed by fixing the relative position between the front and rear springs and the lens holder. do.

The rear spring may be installed between the rear pad and the base to realize better balance and stability in the process of reversing the lens holder, thereby exhibiting excellent screen quality.

In a further development of the invention, the base is provided with a base located on the base, and the rear end of the lens holder rib arch is matched with the base located with each other. This configuration can define the front and rear positions between the lens holder and the yoke ring, between the lens holder and the base, and can improve the assembly process.

The rear pad and the base are coupled without a gap in a fitting manner to prevent fine foreign matter and interference light from entering the lens driving apparatus.

The coil has a cylindrical shape and is fixed to an outer circumferential surface of the lens holder, and the power lead of the coil is drawn out to the rear spring string through two position fixing holes of the rib arch of the lens holder and then welded and fixed. The spring is welded together with the lead lead of the coil as a conductive terminal, and the driving power source forms an electric circuit in the coil through the terminal of the rear spring to form an electromagnetic force, thereby moving the lens holder in the front and rear directions to automatically focus the camera. To realize.

Compared with the prior art, the present invention adopts a configuration in which a yoke ring having a rectangular outline is used as the outer frame and the flat type parts are connected in a fitting manner. Thus, it has excellent electrical and mechanical properties, simplifies the assembly process, and improves assembly precision and product yield. In addition, by configuring and arranging the front and rear spring string in a unique shape, the rotational force generated when the spring is deformed is solved, and the rotational deviation is easily generated when the lens holder moves in the optical axis direction.

1 is a schematic view of the assembled state of the lens driving apparatus according to the present invention as viewed from the front.

2 is a cross-sectional view taken along line B-B of FIG. 1.

3 is a perspective view showing an exploded state of the lens driving apparatus according to the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 to 3 show an embodiment of a lens driving apparatus according to the present invention. The device comprises a yoke ring 1 which is square in the outside and rounded in the inside, and the yoke ring 1 is also used as an outer frame of the lens driving device. The yoke ring 1 has a central through hole 13 and has a '凹' shaped cross-sectional structure having a rectangular outer contour, and an inner chamber 14 having a rounded inside and a rectangular outer shape is installed at one side of the '凹' shaped cross section. The lens holder 6 is provided in the center through hole 13, and the lens holder 6 is formed of a cylindrical body having a center through hole 65, and the outer diameter of the cylindrical body and the center of the yoke ring 1 are provided. The through holes 13 correspond to each other, and a rectangular flange 64 is provided at one end of the cylindrical body, and the inner flange 131 of the rectangular flange 64 and the center through hole 65 correspond to each other. .

The magnet 4 of the triangular prism shape is provided in the four corners of the inner chamber 14 which is round inside the yoke ring 1 and squares outside, and the inside of the inner chamber 14 of the yoke ring 1 is provided. The front pad 2 is covered on the inner front wall, and the front spring 3 is provided between the front pad 2 and the magnet 4, and the lens holder 6 is attached to the other side of the magnet 4. On the other side of the lens holder 6, a rear pad 7 is attached, and a lower part of the rear pad 7 is also engaged with the lower part of the yoke ring 1 by fitting.

The yoke ring 1 may be formed of a polygonal outer shape and an inner chamber to satisfy assembly requirements of various lens driving devices. For example, the inner chamber of the yoke ring 1 may be formed as a pentagonal, hexagonal or octagonal inner chamber, and the magnet 4 may be installed at the corners of the pentagonal, hexagonal or octagonal inner chamber, respectively.

2 and 3, the rear spring 8 is attached to the other side of the rear pad 7, the base 9 is attached to the other side of the rear spring 8, and the base 9 is attached to the rear spring 8. Fixes and compresses the axial position between the rear pad 7, the rear spring 8, and the front pad 2, the magnet 4, the front spring 3, and the lens holder 6. The front spring 3 and the rear spring 8 are lens shift damping devices that maintain balance and stability in the process of moving the lens holder 6, and have excellent performance against vibration and shock.

The front spring 3 has a rectangular outer contour and has a front spring circular hole 33 in the center, and the front spring 3 is formed with a plurality of front spring strings 32 arranged symmetrically with each other. The front spring 3 is formed with a plurality of recesses 34 arranged symmetrically with each other, and the recesses 34 correspond to the rib arch 62 of the lens holder 6. do.

The front spring 3 is provided between the front pad 2 and the magnet 4.

The rear spring 8 has a rectangular outer contour and has a rear spring circular hole 84 in the center, and the rear spring 8 is formed with a plurality of rear spring strings 82 arranged symmetrically with each other. The rear spring 8 is formed with a plurality of rear recesses 83 arranged symmetrically with each other, and the rear recesses 83 correspond to the rib arches 62 of the lens holder 6.

The rear spring 8 is provided between the rear pad 7 and the base 9.

The lens holder 6 is provided in the inner hole of the yoke ring 1 and supported by the front spring 3 and the rear spring 8, and the coil 5 is provided inside the yoke ring 1. The coil 5 is fixed to the outer circumferential surface of the lens holder 6.

The rear spring 8 of the lens driving device is welded with the lead of the coil 5 as one conductive terminal, and the driving power source constitutes an electric circuit inside the coil 5 through the terminal of the rear spring 8. When current flows in the coil 5, an electromagnetic force is formed in a magnetic field formed in the magnet 4 and the yoke ring 1, and the lens holder 6 moves back and forth in the optical axis direction under the push of the electromagnetic force. . When the lens holder 6 is moved, when the reaction force is generated in the front spring 3 and the rear spring 8 and the reaction force is in equilibrium with the electromagnetic force, the lens holder 6 is kept at a fixed position, Achieve the purpose of automatic focusing.

The lens driving apparatus according to the present invention has the following features.

As shown in Figs. 1 and 3, the lens driving apparatus according to the present invention includes a yoke ring 1 whose outer contour is rectangular.

Since the yoke ring 1 is used as the outer frame of the lens driving apparatus, not only the parts constituting the outer frame are omitted, but the structure space is greatly reduced, and the magnets 4 installed at the four corners of the yoke ring 1 are removed. The strength of the magnetic field was increased to a corresponding level by forming a triangular prism to increase the orientation thickness of the magnet 4 by about 30%. Thus, higher electromagnetic stresses can be obtained under the same current conditions, resulting in lower power output and energy savings.

The lens holder 6 is composed of a cylindrical body having a center through hole 65. A rectangular flange 64 is provided at one end of the cylindrical body, and the outer diameter of the cylindrical body is the central through hole of the yoke ring 1. And 13 are matched with each other.

As shown in Fig. 2 and Fig. 3, the frame of the yoke ring 1 is taken as an assembly criterion. The front pad 2, the front spring 3, the magnet 4, the rear pad 7, the rear spring 8 and the base 9 are assembled in a fitting manner. That is, a plurality of yoke ring circumferential position fixing grooves 11 are formed in the yoke ring 1, and the front pad 2, the front spring 3, the lens holder 6, and the rear pad 7 are similarly formed. A plurality of front pad circumferential position fixing grooves 21, a front spring circumferential position fixing groove 31, a lens holder circumferential position fixing groove 61, and a rear pad circumferential position fixing groove 71 are respectively provided. have.

Yoke ring circumferential position fixing groove 11, front pad circumferential position fixing groove 21, front spring circumferential position fixing groove 31, lens holder circumferential position fixing groove 61, and rear pad circumferential position The fixing grooves 71 are all matched with the four position fixing pins of the assembly clamp. All circumferential positioning grooves are assembled on the same positioning assembly clamp as a reference for the positioning process assembly. This not only satisfies the coaxiality requirements among the parts such as yoke ring (1), front pad (2), front spring (3), lens holder (6), rear pad (7), but also simplifies the assembly process and improves the production rate. Raised.

For convenience in processing and assembly, the yoke ring circumferential position fixing groove 11, front pad circumferential position fixing groove 21, front spring circumferential position fixing groove 31, lens holder circumferential position fixing groove It is preferable that each of the 61 and the rear pad circumferential position fixing grooves 71 are formed in four and uniformly distributed in the circumferential direction.

The yoke ring 1, the front pad 2, the front spring 3, the rear pad 7 and the base 9 of the lens driving apparatus according to the present invention are all composed of a flat plate type and assembled in a fitting manner. It is. They do not require fitting pins between the front part and the rear part, which is simpler than the configuration of each part according to the conventional lens driving device and greatly improves the fairness of processing of each part.

As shown in FIG. 3, four corners of the front spring 3 are formed with a front spring string 32 symmetrically arranged with respect to the front spring center, and four corners of the rear spring 8 with a rear side. The rear spring string 82 is formed symmetrically with respect to the spring center. When the front spring string 32 and the rear spring string 82 are configured in a central symmetrical uniform distribution method, when the lens holder 6 is moved, the centrifugal forces generated when the spring is deformed in the optical axis direction cancel each other, It is possible to prevent the rotational deviation from occurring in (6).

Four openings 12 are formed in the circular hole of the yoke ring 1, and four rib arches 62 penetrated up and down are provided on the outer circumferential surface of the lens holder 6, and the yoke ring 1 The opening 12 is matched with the rib arch 62 of the lens holder 6 to prevent the lens holder 6 from rotating. Therefore, when the lens is rotated into the lens holder, it is possible to prevent the front and rear strings from being damaged by the rotation of the lens holder without additional lens fixing device, so that the user can adjust the lens distance very conveniently. It could be done.

As shown in FIG. 2, the front end of the rib arch 62 of the lens holder 6 is matched with the inner hole opening 12 of the yoke ring 1, and the rib arch 62 of the lens holder 6 is matched with each other. The rear end portions 621 of the base 9 are matched with the base located part 91 of the base 9. Therefore, the front and rear positions between the lens holder 6 and the yoke ring 1 and between the lens holder 6 and the base can be limited to prevent damage to the lens driving device due to vibration and shock.

The magnet 4 has a triangular prism shape, which is excellent in processing processability. In addition, the triangular prism magnets not only increased the effective thickness of the magnet but also increased the magnetic field strength generated by the magnet by fully utilizing the effective space of the yoke ring 1 having a rectangular outer and rounded inside. In addition, the processability of the magnet processing and assembly is improved and the magnet can be easily adhered to the inside of the yoke ring 1 during assembly to weaken the magnetic resistance between the magnetic circuits.

As shown in FIG. 3, the leads 51 and 52 of the coil 5 are respectively rear spring strings 82 through the two position fixing grooves 61 of the rib arches of the lens holder 6 shown in FIG. ) And then weld it. Such a configuration can prevent defects such as friction, disconnection, and short circuit, which occur when the lens holder is moved. Friction, disconnection and short-circuit which occur when the lens holder is moved are the cause of defects that are frequently shown in the conventional lens driving apparatus.

The coil 5 is cylindrically fixed to the outer circumferential surface of the lens holder 6. The rib arch 62 of the lens holder 6 can prevent the positional deviation of the coil 5 to ensure the coaxiality of the coil 5 installation.

The rear spring 8 shown in FIG. 3 is provided with two terminals 80 which are symmetrical with respect to the center line thereof, and the base 9 is provided with two coupling parts 92 which are symmetrical with respect to the centerline thereof. The rear spring terminal 80 is matched with the base coupling portion 92. After the lens driving device is assembled, the banding molding is performed on the rear spring terminal 80 and the rivets are heated to form the rear spring terminal 80 in advance to prevent bending of the rear spring terminal 80 in advance. Therefore, assembly fixability is greatly improved.

3 shows a configuration in which the front end of the lens holder 6 and the front spring 3 are fixed. A projection 63 is formed in the lens holder 6, and a recessed portion is formed in the front spring 3. Since the protrusions 63 match each other with the recesses of the front springs 3, the protrusions 63 serve to fix the positions. Similarly, a recess 83 is formed in the rear spring 8, and the recess 83 of the rear spring is matched with the rear protrusion 621 of the lens holder 6 to thereby be the front spring 3 and the rear spring. The relative position between the 8 and the lens holder 6 is fixed, thereby preventing the positional deviation between the front spring 3 and the rear spring 8.

When assembling the lens driving apparatus according to the present invention using a four-point fixing clamp having a high precision, the assembly process is as follows.

(1) The circumferential position fixing groove 11 of the yoke ring 1 is introduced into the four position fixing pin of the position fixing clamp.

(2) The front pad circumferential position fixing groove 21 of the front pad 2 is introduced into the four-point position fixing pin of the position fixing clamp and then inserted into the yoke ring 1.

(3) The circumferential position fixing groove 31 of the front spring 3 is introduced into the four-point position fixing pin of the position fixing clamp and then inserted into the yoke ring 1.

(4) The triangular prism magnet 4 is inserted into four corners of the inner chamber of the yoke ring 1.

(5) The coil 5 is inserted along the rib arch 62 of the lens holder 6 and fixed to the sheet of the lens holder 6.

(6) The circumferential position fixing groove 61 of the lens holder 6 is introduced into the four-point position fixing pin of the position fixing clamp and then inserted into the inner hole of the yoke ring 1. The coil 5 is located between the magnet 4 and the inside of the yoke ring 1.

(7) The rear pad 7 is inserted into the rear end of the yoke ring 1.

(8) The rear spring 8 is inserted into the rear end of the rear pad 7.

(9) The base 9 is inserted into the rear end of the rear pad 7.

(10) After the terminal 80 of the rear spring 8 is bent, the rivets are heated and fixed to complete the assembly of the lens driving apparatus.

The present invention uses a high-precision four-point fixed clamp, so that not only the assembly process is simple, but also the assembly yield is improved by maximizing the coaxiality of each component installation and the uniformity of the distance between the moving parts.

The assembly method of this drive system not only ensures accuracy, but also inspects the electrical properties of the finished product in the non-adhesive state, then proceeds to adhesion and shaping of the passed product and adjusts to the rejected product. Can improve.

The bending and rivet heating process of the rear spring terminal proceeding after the assembly is completed eliminates the excessive demand for the assembly precision of the rear pad and the base according to the pre-bending method, thereby simplifying the processing process.

The yoke ring of the lens driving apparatus according to the present invention is also used as an outer frame of the lens driving apparatus because the outer side is rectangular and the inner side is rounded, and the outer frame of the yoke ring is mainly assembled by fitting each member. The non-spacing fit assembly method of the rear pad and the base prevents fine foreign matter and interference light from entering the lens driving device, thereby significantly increasing the assembly precision. In addition, the strings of the front and rear springs are symmetrically configured up, down, left, and right to eliminate rotational deviation due to deformation to prevent the optical axis from moving finely when the lens holder is moved. Therefore, it has excellent electrical and mechanical properties to meet the high demands for precision and image quality when combined with a miniaturized sensor.

The present invention maximizes space utilization by forming the yoke ring as an outer frame of the lens driving device, and further reduces the appearance size in a similar structure. The fitting assembly method improved the assembly precision and assembly efficiency between each member, and simplified the geometrical shape of each member, significantly improving the processability of parts processing and product assembly, improving product yield, and reducing product cost.

Claims (15)

A yoke ring (1) mounted on the base (9) and provided with a magnet (4) and a coil (5) therein, and on the inner circumferential surface of the coil (5) a lens holder (6) with a lens The lens holder 6 is movable in the front-rear direction inside the yoke ring 1, and the front and rear of the lens holder 6 in the process of moving the lens holder 6 is balanced and The lens shift damping device is installed to maintain stability, and the electromagnetic force generated after the coil 5 is energized so that the lens holder 6 moves in the optical axis direction against the damping force of the lens shift damping device. In the lens driving device is provided between the lens holder 6 and the yoke ring 1 and a position fixing device for preventing the positional deviation and movement of the lens holder 6, The yoke ring 1 has a central through hole 13 and forms a '凹' shaped cross-sectional structure having a rectangular outer contour, and has an inner chamber 14 having a rounded inside and a rectangular outside at one side of the '凹' shaped cross section. ) Is formed, The magnet 4 is mounted to the corner of the inner chamber 14 of which the inside is round and the outside is rectangular, The lens shift damping device comprises a front spring 3 having a front pad 2 and a rear spring 8 having a rear pad 7, the front pad 2 having a front side of the inner chamber 14. Is covered in the wall 15, The yoke ring 1, the front pad 2, the front spring 3, the lens holder 6, the rear spring 8, and the base 9 are all flat. And these are connected in a fitting manner to each other to constitute the positioning device, The position fixing device between the yoke ring 1, the front pad 2, the front spring 3, the lens holder 6, the rear spring 8, and the base 9, A plurality of yoke ring circumferential position fixing grooves 11 provided in the center through hole 13 of the yoke ring 1, a plurality of front side pad circumferential position fixing grooves 21 provided in the front pad 2, the front side A plurality of front spring circumferential position fixing groove 31 provided in the spring (3), a plurality of lens holder circumferential position fixing groove (61) provided in the lens holder (6), and a plurality of installed in the rear spring (8) A rear spring circumferential positioning groove 81 of The yoke ring circumferential position fixing groove 11, the front pad circumferential position fixing groove 21, the front spring circumferential position fixing groove 31, the lens holder circumferential position fixing groove 61, and the The position of the rear pad circumferential position fixing grooves 81 correspond to each other. The method of claim 1, The lens holder 6 is provided in the central through hole 13, and the lens holder 6 is composed of a cylindrical body having a central through hole 65, and the outer diameter of the cylindrical body is through the center of the yoke ring. Matched with the hole 13, a rectangular flange 64 is provided at one end of the cylindrical body, and matched with the inner end face 131 of the rectangular flange 64 and the central through-hole 13 , Lens drive. delete delete The method of claim 1, The geometry of the magnet (4) is a triangular prism, the lens driving device. The method of claim 1, The magnets (4) are composed of four, and the four magnets (4) are respectively installed in the four corners of the yoke ring inner chamber (14), the lens driving device. delete The method of claim 1, The yoke ring circumferential position fixing groove 11, the front pad circumferential position fixing groove 21, the front spring circumferential position fixing groove 31, the lens holder circumferential position fixing groove 61, and the The rear spring circumferential position fixing groove (81) is composed of four each, evenly distributed in the circumferential direction, the lens driving device. The method of claim 1, The position fixing device between the lens holder 6 and the yoke ring 1 passes through the four openings 12 provided in the yoke ring center through hole 13 and the outer circumferential surface of the lens holder 6 up and down. Four rib arches 62 are formed, the openings 12 and the rib arches 62 are matched with each other, and the openings 12 and the rib arches 62 are composed of four, and the centers of the rib arches 62 are formed. Symmetrical, lens drive. 10. The method of claim 9, The front spring 3 is composed of a sheet having a rectangular contour, and a front spring circular hole 33 is formed at the center thereof, and the front spring 3 has a plurality of front spring strings (symmetrically arranged). 32) A plurality of recesses (34) arranged symmetrically with each other are formed, and the recesses (34) and the rib arches (62) of the lens holder match each other. The method of claim 10, The front spring string 32 is composed of four and arranged symmetrically up, down, left and right with respect to the center, the front spring 3 is disposed between the front pad 2 and the magnet 4, the lens drive Device. 10. The method of claim 9, The rear spring 8 is composed of a sheet having a rectangular contour, and has a rear spring circular hole 84 formed in the center thereof, and the rear spring 8 has a plurality of rear spring strings arranged symmetrically with each other. 82) and a plurality of rear recesses (83) arranged symmetrically with each other, wherein the rear recesses (83) and the rib arches (62) of the lens holder match each other. The method of claim 12, The rear spring string 82 is composed of four and arranged symmetrically up, down, left and right along the center, the rear spring 82 is installed between the rear pad 7 and the base 9, the lens Drive system. 10. The method of claim 9, A base positioning part (91) is formed in the base (9), and the base positioning part (91) and the rear end portion (621) of the lens holder rib arch (62) are matched with each other. The method of claim 14, The coil 5 has a cylindrical shape and is fixed to an outer circumferential surface of the lens holder, and the power leads of the coil 5 are 51 and 52 and two position fixing holes of the rib arch 62 of the lens holder 6 are formed. The lens driving device is fixed by welding after being drawn out toward the rear spring string (82) through.

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