CN201060303Y - Lens driving device with line type prepressing function - Google Patents

Abstract

A lens driving device having a line pre-pressing function, comprising: the fixing piece, the moving guide part, the moving piece and at least one linear elastic piece. The fixture has an air core coil thereon. The moving part is provided with a hollow magnet group thereon, and the moving part can move along the moving guide part and is arranged on the fixed part. Thus, when the hollow coil is electrified, the hollow coil and the hollow magnet group generate electromagnetic thrust which can enable the moving piece to move. Furthermore, two ends of each linear elastic element are respectively connected with the fixed element and the moving element, and the linear elastic elements respectively apply lateral pre-pressure and axial restoring force on the moving element.

Description

Lens drive device with linear preload function

technical field

The utility model relates to a lens driving device, in particular to a lens driving device with a linear preload function.

Background technique

In recent years, it has become increasingly common for handheld devices to be equipped with imaging modules. With the market demand for better performance and smaller size of handheld devices, imaging modules are facing dual requirements for higher image quality and miniaturization. For the improvement of image quality, on the one hand, it is to increase the pixels. The market trend of image capture modules for handheld devices has gradually increased from 300,000 pixels of VGA level to megapixels, 2 million pixels, 3 million pixels, and even higher. Level of 4 million, 5 million pixel development. In addition to the improvement of pixels, the clarity of image capture is also more concerned, so the image capture module of handheld devices has also developed from a fixed-focus image capture function to an optical autofocus function similar to a camera, or even an optical zoom function.

The working principle of the optical autofocus function is to move the lens in the imaging module appropriately according to the different distances of the imaging target, so that the optical image of the imaging target can be accurately focused on the image sensor, thereby producing a clear image. At present, the more common driving methods for moving the lens in the imaging module include stepping motor driving, piezoelectric driving, and voice coil motor (Voice Coil Motor, VCM) driving.

Generally speaking, the mechanism of the voice coil motor is mainly composed of coils placed in a magnetic circuit containing permanent magnets. According to Fleming's left-hand rule, when the coil conducts electricity, it will generate an interactive propulsion force with the permanent magnet, thereby moving the bearing seat connected to the permanent magnet, and then driving the lens bearing slide seat fixed on the bearing seat, and by adjusting the flow The magnitude of the current passing through the coil achieves the purpose of optical zoom and focus.

However, when the voice coil motor drives the lens to move back and forth to achieve the purpose of optical zoom and focus, the gap between the contact surface between the moving part and the fixed part of the imaging module often causes the free deflection angle of the lens to be too large when moving. Thus, image quality is reduced. Therefore, the use of voice coil motors for optical zooming and focusing requires high-precision positioning functions. At the same time, high-precision requirements on the relative deflection between the fixed axis and the optical axis are required to meet the performance of optical imaging.

A voice coil motor 3 is mentioned in Taiwan Patent Publication No. 200525859 "Voice Coil Motor Device". As shown in FIG. 1A , the voice coil motor 3 includes a slide seat 31 , a magnetic circuit component 32 , a coil 33 , a plurality of guiding steel shafts 341 , 342 and a base 35 . The sliding seat 31 is rigidly connected to the magnetic circuit component 32 , and the coil 33 and a plurality of guiding steel shafts 341 , 342 are respectively fixed on the base 35 . Wherein, as shown in FIG. 1B , the magnetic circuit component 32 provides the leakage flux 37 to magnetically interlink with the plurality of guiding steel shafts 341 , 342 through the gap 36 to generate magnetic pre-pressures 381 , 382 . The resultant torque formed by the magnetic preload 381, 382 can eliminate the gap between the contact surfaces 311, 312 of the moving part and the fixed part, so that when the sliding seat 31 moves back and forth, low friction, no free deflection, and high precision can be obtained. exercise results.

However, the aforementioned voice coil motor 3 needs to use a yoke to guide the leakage flux 37 to the outer edge and magnetically interlink with the multiple guide steel shafts 341, 342 to achieve the effect of magnetic preloading. However, the configuration of the yoke will affect the manufacturing process. The difficulty on the board also limits the configuration of other components, and there is still a bottleneck in miniaturization.

Utility model content

The purpose of this utility model is to provide a lens drive device with a linear preload function, which adopts at least one non-overlapping (dislocation) linear Elastic parts are used to generate lateral preload and axial restoring force, which are applied respectively in "making the round hole-shaped or open arc-shaped bearing surface of the lens bearing slide seat close to the moving guide part" and "when the electromagnetic thrust disappears". , the axial restoring force provided by the linear elastic member can restore the moving member to its original position”.

In order to achieve the above purpose, the utility model provides a lens driving device with linear preloading function, which includes: a fixed part, a moving guide part, a moving part and at least one linear elastic part. The fixing part has an air core coil on it. The moving part has a hollow magnet set thereon, and the moving part is movably arranged on the fixing part along the moving guide part. In this way, when the air-core coil is energized, the air-core coil and the hollow magnet assembly generate an electromagnetic thrust that can move the moving part. Furthermore, the two ends of each linear elastic element are respectively connected to the fixed element and the moving element, and the linear elastic element exerts a lateral preload and an axial restoring force on the moving element.

In order to achieve the above purpose, the utility model also provides a lens driving device with linear preloading function, which includes: a fixed part, a moving guide part, a moving part and at least one linear elastic part. The fixing part has a hollow magnet group on it. The moving part has an air core coil thereon, and the moving part is movably arranged on the fixing part along the moving guide part. In this way, when the air-core coil is energized, the air-core coil and the hollow magnet assembly generate an electromagnetic thrust that can move the moving part. Furthermore, the two ends of each linear elastic element are respectively connected to the fixed element and the moving element, and the linear elastic element exerts a lateral preload and an axial restoring force on the moving element.

The linear elastic part adopted by the utility model provides lateral preload on the moving part, so that the moving part is affected by the lateral preload when moving, and can eliminate the gap between the fixed part and the tight It is in contact with the fixed part to obtain low friction, no free deflection, and high-precision motion results. At the same time, the linear elastic member is extremely easy to configure and assemble without adding difficulty in manufacturing, and also provides flexibility in the configuration of other components, which is beneficial to the development of miniaturization of applied products.

In order to further understand the technology, means and effects of the utility model, please refer to the following detailed description and accompanying drawings of the utility model. However, the following embodiments and corresponding drawings are only used for reference and description, and should not be construed as limiting the protection scope of the present utility model.

Description of drawings

FIG. 1A is a schematic structural view of a known voice coil motor device;

Fig. 1 B is the A-A sectional view of Fig. 1A;

FIG. 2 is a schematic structural view of the first embodiment of the lens driving device of the present invention;

Fig. 3 is a 3-3 sectional view of Fig. 2;

4 is a schematic structural view of the second embodiment of the lens driving device of the present invention;

Fig. 5 is a 5-5 sectional view of Fig. 4;

6 is a schematic structural diagram of a third embodiment of the lens driving device of the present invention;

7 is a schematic structural view of a fourth embodiment of the lens driving device of the present invention; and

FIG. 8 is a schematic structural diagram of a fifth embodiment of the lens driving device of the present invention.

Wherein, the reference numerals in Fig. 1A and 1B are explained as follows: 3, voice coil motor; 31, slide seat; 311, 312, contact surface; 32, magnetic circuit component; 33, coil; 341, 342, guide steel shaft ; 35, base; 36, gap; 37, leakage flux lines; 381, 382, magnetic preload.

The reference signs in Figures 2 to 8 are explained as follows: 2, 2', 4, 4', lens driving device; 21, 41, 61, lens bearing slide; 610, sliding hole; 212, 412, chute socket ; 22, 42, 62, fixed shaft; 23, 43, fixed seat; 232, 432, open hole; 234, 434, closed hole; 24, 44, base; 25, 45, hollow coil; 26, 26' , 46, thin hollow magnet; 260, first hollow magnet; 261, second hollow magnet; 262, hollow guide disk; 27, 47, 67, linear elastic member; P1, lateral preload; P2, axial recovery force.

Detailed ways

Please refer to FIG. 2 , which is a schematic structural diagram of the first embodiment of the lens driving device of the present invention. The lens driving device 2 of the present invention includes: a lens carrying slide 21 , two moving guide parts, a fixed seat 23 , a base 24 , a hollow coil 25 , a hollow magnet group 26 , and two linear elastic parts 27 .

As shown in FIG. 2 , the lens carrying slide 21 is provided with a lens (not marked) for taking images, and the lens carrying slide 21 and the hollow magnet group 26 are assembled to form the moving part of the lens driving device 2 of the present invention. And the fixing seat 23, the base 24 and the hollow coil 25 constitute the fixing part of the lens driving device 2 of the present invention after being assembled.

In addition, the fixing seat 23 extends upwards from the base 24 . The two moving guide parts can be two fixed shafts 22, the fixed shafts 22 are fixedly arranged on the base 24 and are used to connect the fixed part and the moving part, and are arranged in the round hole of the lens carrying slide 21 The inner edge of the shaped or open arc-shaped bearing surface serves as a guide for the movement of the moving part, so that the moving part can move axially on the fixed part. Wherein the fixed shaft 22 is made of magnetically permeable material. When the hollow coil 25 conducts electricity, an electromagnetic field is generated, and the electromagnetic field interacts with the magnetic field lines emitted by the hollow magnet set 26 to generate electromagnetic thrust, which can be used to push the moving part to move axially.

Furthermore, the moving guide part of the lens driving device 2 of the present invention can be changed from the fixed shaft 22 to: at least one sliding surface fixedly arranged on the base 24 and used to connect the fixed part and the moving part, as the moving part Guide for moving parts.

Referring again to FIG. 2 , the linear elastic member 27 uses conductive material as the medium for the power supply of the hollow coil 25 . Furthermore, the linear elastic member 27 has a fixed part (not marked) and a preloaded part (not marked), wherein the fixed part is connected to the fixing seat 23, and the preloaded part is connected to the lens bearing slide 21, The preloading part is used for applying a lateral preload P1 to the lens carrying slide 21 . The lateral preload P1 makes the round hole-shaped or open arc-shaped bearing surface of the lens bearing slide 21 close to the surface of the fixed shaft 22, so that when the moving part moves in the axial direction, low friction, no free deflection, and high Precision motion results. The linear elastic member 27 also provides an axial restoring force (returning elastic force) P2 to the moving member, and the axial restoring force P2 is opposite to the aforementioned electromagnetic thrust. When the electromagnetic thrust disappears, the axial restoring force P2 provided by the linear elastic member 27 can restore the moving member to its original position.

Still referring to FIG. 2 , in the first embodiment of the present invention, the lens carrying slide 21 is provided with two sliding groove insertion holes 212 , and the fixing base 23 is provided with two corresponding closed through holes 234 . The linear elastic member 27 is a non-overlapping linear elastic member, which is respectively connected between the slide slot insertion hole 212 and the closed through hole 234 .

In conjunction with FIG. 2 , please refer to FIG. 3 , which is a sectional view of 3-3 in FIG. 2 . The hollow magnet set 26 is composed of a first hollow magnet 260 , a second hollow magnet 261 , and a hollow conductive disc 262 connected between the first and second hollow magnets 260 , 261 . The first and second hollow magnets 260 , 261 are combined on two opposite sides of the hollow magnetic disk 262 opposite to each other with the same magnetic poles. Wherein, the hollow conductive disk 262 absorbs the magnetic force lines Φ1 and Φ2 emitted by the first and second hollow magnets 260 and 261, and makes the magnetic force lines Φ1 and Φ2 pass through the air-core coil 25 to conduct electricity with the air-core coil 25. The electromagnetic fields interact to generate electromagnetic thrust to drive the moving member.

In other words, since the first hollow magnet 260 and the second hollow magnet 261 are magnetically coupled to the hollow conductive disk 262 with the same polarity, the emitted magnetic force lines Φ1 and Φ2 will repel each other and will not affect each other. At the same time, the magnetic force lines Φ1, Φ2 will be absorbed and concentrated by the hollow guiding disk 262 . The magnetic force lines Φ1 and Φ2 start from the lower surface of the N-pole of the first hollow magnet 260 and the upper surface of the N-pole of the second hollow magnet 261, respectively, and are guided by the hollow guide disk 262, and turn to the air gap formed by the slidable gap. The magnetic force lines Φ1, Φ2 passes through the air gap and passes through the hollow coil 25, and returns to the upper surface of the S pole of the first hollow magnet 260 and the lower surface of the S pole of the second hollow magnet 261 respectively, forming two closed magnetic circuits. When the magnetic force lines Φ1 and Φ2 pass through the air-core coil 25, they will interact with the electromagnetic field generated by the air-core coil 25 to generate electromagnetic thrust.

The utility model stores and concentrates the magnetic force lines Φ1 and Φ2 emanating from the two hollow magnets 260 and 261 through the hollow guiding disk 262, and then guides the collected and concentrated magnetic force lines Φ1 and Φ2 to pass through the hollow coil 25 effectively, so that the two The magnetic lines of force Φ1 and Φ2 emanating from the hollow magnets 260 and 261 will not leak, so as to effectively obtain sufficient driving force to drive the lens to move.

At the same time, through the design that the first hollow magnet 260 and the second hollow magnet 261 are magnetically coupled to the hollow conductive disk 262 with the same polarity, the magnetic force lines Φ1 and Φ2 emitted by the first hollow magnet 260 and the second hollow magnet 261 form a mutual repulsion. Therefore, there will be no magnetic linkage effect, that is, the mutual influence of the magnetic lines of force Φ1 and Φ2 will be avoided.

In conjunction with FIG. 2 , please refer to FIG. 4 , which is a schematic structural diagram of a second embodiment of the lens driving device of the present invention. The components in the lens driving device 2' of the first embodiment of the utility model are the same as those in the lens driving device 2 of the first embodiment, and are marked with the same symbols. The working principle and effect of the magnetic circuit and the circuit of the second embodiment and the first embodiment are the same. After comparison, the main difference is that the fixing seat 23 of the second embodiment is provided with at least one open E-shaped perforation 232 to replace the closed perforation 234 in the first embodiment, so as to reduce the threading of the closed perforation 234 during assembly. The man-hours spent on the step. Since the closed perforation 234 is used as the connection point of the linear elastic member 27 on the fixed seat 23, one end of the linear elastic member 27 must be connected to the chute socket 212 of the lens carrying slide seat 21 in assembly, and then The other end is passed through the closed through hole 234 and fixedly connected to the fixing base 23, this threading step will slow down the assembly speed.

Therefore, in the second embodiment of the present utility model, the open E-shaped perforation 232 is used as the connection point of the linear elastic member 27 on the fixing seat 23, and the staff only need to first connect one end of the linear elastic member 27 during assembly. Connect it to the chute socket 212 of the lens carrying slide 21, and then connect the other end to the open E-shaped through hole 232 and fix it in the fixing seat 23. This method greatly improves the assembly speed, thereby accelerating Increased output.

Furthermore, in the second embodiment, the principle of the sectional view shown in FIG. 5 is the same as that in FIG. 3 in the first embodiment. Wherein the hollow magnet group 26' is composed of a first hollow magnet 260 and a hollow conductive disk 262. Therefore, the hollow conductive disk 262 absorbs the magnetic force line Φ1 emitted by the first hollow magnet 260, and makes the magnetic force line Φ1 pass through the air-core coil 25, and interacts with the electromagnetic field generated by the air-core coil 25 to generate electromagnetic thrust driving. The moving pieces.

In other words, the second embodiment removes the second hollow magnet 261 in the first embodiment, and only uses the first hollow magnet 260 to provide the magnetic flux Φ1. Similarly, the hollow magnetic disk 262 absorbs the magnetic flux Φ1 emitted by the first hollow magnet 260, and makes the magnetic flux Φ1 pass through the hollow coil 25, and interacts with the electromagnetic field generated by the hollow coil 25 to generate electromagnetic thrust to drive the moving part. .

In the lens driving device 2' of the second embodiment of the present utility model, the magnetic force line Φ1 starts from the lower surface of the N pole of the first hollow magnet 260, and is absorbed and concentrated by the hollow guide disk 262, and is guided by the hollow guide disk 262 to turn The air gap formed by the slidable gap, the magnetic force line Φ1 passes through the air gap and passes through the hollow coil 25 , and then returns to the upper surface of the S pole of the first hollow magnet 260 , forming a closed magnetic circuit. When the magnetic force line Φ1 passes through the air-core coil 25 , it will interact with the electromagnetic field generated by the air-core coil 25 to generate electromagnetic thrust.

The utility model stores and concentrates the magnetic force lines Φ1 emitted by the first hollow magnet 260 through the hollow guide disk 262, and guides the collected and concentrated magnetic force lines Φ1 to pass through the hollow coil 25 effectively, allowing the first hollow magnet 260 to diverge The outgoing magnetic lines of force Φ1 will not leak, thus effectively obtaining sufficient driving force to drive the lens to move.

Please refer to FIG. 6 , which is a schematic structural diagram of a third embodiment of the lens driving device of the present invention. The lens driving device 4 of the present invention includes: a lens carrying slide 41 , two moving guide parts, a fixed seat 43 , a base 44 , a hollow coil 45 , a hollow magnet set 46 , and two linear elastic parts 47 . Wherein, the two moving guiding components can be two fixed shafts 42 or two sliding surfaces.

As shown in FIG. 6 , the lens carrying slide 41 is provided with a lens (not marked) for taking images, and the lens carrying slide 41 and the hollow coil 45 are assembled to form the moving part of the lens driving device 4 of the present invention. The fixing seat 43 , the base 44 and the hollow magnet group 46 constitute the fixing part of the lens driving device 4 of the present invention after being assembled. The fixed shaft 42 is fixedly arranged on the base 44, and is placed on the inner edge of the circular hole-shaped or open arc bearing surface of the lens carrying slide 41, as a guide for the movement of the moving part, so that the moving part can Axial movement is carried out on the fixed part. When the hollow coil 45 conducts electricity, an electromagnetic field is generated, and the electromagnetic field interacts with the magnetic field lines emitted by the hollow magnet set 46 to generate electromagnetic thrust, which can be used to push the moving part to move axially.

Referring to FIG. 6 again, the linear elastic member 47 has a fixed part (not marked) and a preloaded part (not marked), wherein the fixed part is connected to the fixing seat 43, and the preloaded part is connected to the lens carrying slide The seat 41 , the preloading portion is used to apply a lateral preload P1 to the lens carrying slide 41 . The lateral preload P1 makes the round hole-shaped or open arc-shaped bearing surface of the lens bearing slide 41 close to the surface of the fixed shaft 42, so that when the moving part moves in the axial direction, low friction, no free deflection, and high Precision motion results. The linear elastic member 47 also provides an axial restoring force (returning elastic force) P2 to the moving member, and the axial restoring force P2 is opposite to the aforementioned electromagnetic thrust. When the electromagnetic thrust disappears, the axial restoring force P2 provided by the linear elastic member 47 can restore the moving member to its original position.

Still referring to FIG. 6 , the lens carrying slide 41 is provided with two chute insertion holes 412 , and the fixing base 43 is provided with two corresponding closed through holes 434 . The linear elastic member 47 is a non-overlapping linear elastic member, which is respectively connected between the slide slot insertion hole 412 and the closed through hole 434 . Furthermore, the hollow magnet set 46 can be selected as the hollow magnet set 2 of the first embodiment or the hollow magnet set 2' of the second embodiment according to actual needs.

In conjunction with FIG. 6 , please refer to FIG. 7 , which is a schematic structural diagram of a fourth embodiment of the lens driving device of the present invention. The components in the lens driving device 4' of the fourth embodiment of the present utility model are the same as those in the lens driving device 4 of the third embodiment, and are marked with the same symbols. The magnetic circuit and circuit of the fourth embodiment and the third embodiment have the same working principle and achieved effect. After comparison, the main difference is that the fixing seat 43 of the fourth embodiment is provided with at least one open E-shaped through hole 432 The closed perforation 434 of the third embodiment is replaced to reduce the man-hours spent on the threading step of the closed perforation 434 in the assembly process. Since the closed perforation 434 is used as the connection point of the linear elastic member 47 on the fixed seat 43, one end of the linear elastic member 47 must be connected to the chute socket 412 of the lens carrying slide 41 when assembling, and then The other end is passed through the closed through hole 434 and fixedly connected to the fixing base 43, this threading step will slow down the assembly speed.

Please refer to FIG. 8 , which is a schematic structural diagram of a fifth embodiment of the lens driving device of the present invention. The fifth embodiment of the present utility model discloses that the moving part (this is the lens carrying slide 61 plus a coil (such as the first and second embodiments) or a magnet (such as the third and fourth embodiments)) has two pieces that cooperate with the fixed shaft 62 sliding holes 610, and the sliding holes 610 are elliptical holes parallel to each other. Furthermore, according to different design requirements, the oval hole can be a closed hole or an open hole. In addition, the long side of the elliptical hole is in the same direction as the shrinking direction of the two linear elastic members 67 .

In this way, the fifth embodiment of the utility model has the following advantages through the setting of the elliptical sliding hole 610:

1. The two elliptical holes (two sliding holes 610) can absorb the mechanical tolerance of [distance between shafts] and [distance between holes] through slight adjustment of the relative angle between the fixed part and the moving part, so that the moving part can be installed in the fixed part. It is easier when

2. The short sides of the two elliptical holes (two sliding holes 610) help to restrain the moving parts (especially the lens bearing slide 61) from rotating, tilting and shaking on the X axis, thus helping to improve the optical quality of the lens. At the same time, it helps to improve the smoothness of sliding.

3. The long sides of the two elliptical holes (the two sliding holes 610 ) can be used as the shrinkage of the linear elastic member 67 when it is bent in the X-axis direction.

4. The translation or rotation of the moving part (especially the lens bearing slide 61 ) in the Y-axis direction can be restricted by the linear elastic part 67 , and a smooth and smooth movement in the Y-axis can also be obtained.

To sum up, the lens driving device of the present invention provides a fixed part, a moving part, at least one moving guiding part (such as a fixed shaft or a sliding surface), and at least one linear elastic part. The moving part is movably arranged on the fixing part along the moving guide part. The linear elastic parts respectively have a fixed part and a preloaded part, wherein the fixed part is connected to the fixed part, the preloaded part is connected to the moving part, and the preloaded part exerts a lateral preload on the moving part . At the same time, the linear elastic element provides an axial restoring force (resetting elastic force) to the moving element. The fixed shaft is fixedly arranged on the fixed part and serves as a guide for the movement of the moving part.

The utility model adopts the linear elastic part to provide lateral pre-pressure on the moving part, so that the moving part is affected by the lateral pre-pressure when moving, thereby eliminating the gap between the fixed part and making close contact The mobile guide part (fixed shaft) on the fixed part, thus obtaining low friction, no free deflection, high precision movement results. At the same time, the linear elastic member is extremely easy to configure and assemble, not only does not add difficulty in manufacturing, but also provides flexibility in the configuration of other components, which is beneficial to the development of miniaturization of applied products.

The above is only a detailed description of the preferred embodiment of the utility model and an introduction to the accompanying drawings, and the features of the utility model are not limited thereto. Any change or modification that can be easily conceived by anyone familiar with the art within the field of the utility model can be covered within the protection scope of the utility model patent. The patent protection scope of the utility model is defined by the appended claims as the criterion.

Claims (25)

1. A lens driving device with a linear preload function, characterized in that it comprises: A fixing piece with a hollow coil on it; mobile guide components; a moving part having a hollow magnet set thereon, and the moving part is arranged on the fixed part so as to be movable along the moving guide part; and At least one linear elastic element, wherein the two ends of each linear elastic element are respectively connected to the fixed element and the moving element, and the linear elastic element exerts a lateral preload and an axial restoring force on the moving element . 2 . The lens driving device with a linear preload function as claimed in claim 1 , wherein the fixing member comprises a base and a fixing seat extending upward from the base. 3 . 3. The lens driving device with linear preloading function according to claim 2, characterized in that: the moving guide part is at least one fixedly arranged on the base and used for connecting the fixing part and the moving part Shaft, as a guide for the movement of the moving part. 4 . The lens driving device with linear preloading function according to claim 3 , wherein the moving part has at least one sliding hole cooperating with the fixed shaft, and the sliding hole is a parallel elliptical hole. 5. The lens driving device with linear preload function as claimed in claim 4, wherein the elliptical hole is a closed hole or an open hole. 6 . The lens driving device with a linear preload function as claimed in claim 4 , wherein the long side of the elliptical hole is in the same direction as the contraction direction of the linear elastic member. 7 . 7. The lens drive device with linear preload function according to claim 2, characterized in that: the moving guide part is at least one sliding part fixedly arranged on the base and used to connect the fixed part and the moving part The surface acts as a guide for the movement of the moving part. 8. The lens driving device with linear preloading function as claimed in claim 1, wherein the fixing part comprises a base and a fixing seat extending upward from the base, the moving part has at least one chute socket, And the fixing seat has at least one closed perforation, the linear elastic member is a non-overlapping linear elastic member, and the two ends of each linear elastic member are respectively connected between the chute socket and the closed perforation . 9. The lens driving device with linear preloading function according to claim 1, wherein the fixing part comprises a base and a fixing seat extending upward from the base, the moving part has at least one chute socket, And the fixing seat has at least one open through hole, the linear elastic member is a non-overlapping linear elastic member, and the two ends of each linear elastic member are respectively connected between the chute insertion hole and the open through hole . 10 . The lens driving device with linear preload function as claimed in claim 1 , wherein the hollow magnet group is composed of one hollow magnet. 11 . 11. The lens driving device with linear preloading function according to claim 1, characterized in that: the hollow magnet group is composed of a hollow magnet and a hollow conductive disk, and the hollow magnetic disk absorbs the hollow magnet. Distributed magnetic force lines, and make the magnetic force lines pass through the air-core coil, and interact with the electromagnetic field generated by the air-core coil after conduction, so as to generate electromagnetic thrust to drive the moving part. 12. The lens driving device with a linear preload function as claimed in claim 1, wherein the hollow magnet group is composed of a first hollow magnet, a second hollow magnet, and a joint between the first and second hollow magnets. and the first and second hollow magnets are combined on the two opposite sides of the hollow magnet with opposite magnetic poles, wherein the hollow magnet absorbs the magnetic field lines emitted by the first and second hollow magnets , and make the magnetic flux pass through the hollow coil, and interact with the electromagnetic field generated by the hollow coil to generate electromagnetic thrust to drive the moving part. 13. A lens driving device with a linear preload function, characterized in that it comprises: A fixing piece with a hollow magnet group on it; mobile guide components; a moving part having an air core coil thereon, and the moving part is provided on the fixing part movably along the moving guide part; and At least one linear elastic element, wherein two ends of each linear elastic element are respectively connected to the fixed element and the moving element, and the linear elastic element exerts a lateral preload and an axial restoring force on the moving element. 14. The lens driving device with a linear preload function as claimed in claim 13, wherein the fixing member comprises a base and a fixing seat extending upward from the base. 15. The lens drive device with linear preload function according to claim 14, characterized in that: the moving guide part is at least one fixedly arranged on the base and used to connect the fixing part and the moving part Shaft, as a guide for the movement of the moving part. 16. The lens driving device with a linear preload function as claimed in claim 15, wherein the moving part has at least one sliding hole cooperating with the fixed shaft, and the sliding hole is a parallel elliptical hole. 17. The lens driving device with a linear preload function as claimed in claim 16, wherein the elliptical hole is a closed hole or an open hole. 18. The lens driving device with a linear preload function as claimed in claim 16, wherein the long side of the elliptical hole is in the same direction as the contraction direction of the linear elastic member. 19. The lens driving device with linear preloading function according to claim 14, characterized in that: the moving guide part is at least one sliding part fixed on the base and used to connect the fixed part and the moving part The surface acts as a guide for the movement of the moving part. 20. The lens driving device with linear preloading function as claimed in claim 13, wherein the fixing part comprises a base and a fixing seat extending upward from the base, the moving part has at least one chute socket, And the fixing seat has at least one closed perforation, and the linear elastic member is a non-overlapping linear elastic member, and the two ends of each linear elastic member are respectively connected between the chute socket and the closed perforation between. 21. The lens drive device with linear preloading function according to claim 13, characterized in that: the fixing part comprises a base and a fixing seat extending upward from the base, the moving part has at least one chute socket, And the fixing seat has at least one open through hole, the linear elastic member is a non-overlapping linear elastic member, and the two ends of each linear elastic member are respectively connected between the chute insertion hole and the open through hole . 22. The lens driving device with a linear preload function as claimed in claim 13, wherein the linear elastic member adopts a conductive material as a power supply medium for the hollow coil. 23. The lens driving device with linear preload function as claimed in claim 13, wherein the hollow magnet group is composed of one hollow magnet. 24. The lens drive device with linear preload function as claimed in claim 13, characterized in that: the hollow magnet group is composed of a hollow magnet and a hollow conductive disk, and the hollow magnetic disk absorbs the hollow magnet. Distributed magnetic force lines, and make the magnetic force lines pass through the air-core coil, and interact with the electromagnetic field generated by the air-core coil after conduction, so as to generate electromagnetic thrust to drive the moving part. 25. The lens drive device with linear preload function as claimed in claim 13, characterized in that: the hollow magnet group consists of a first hollow magnet, a second hollow magnet, and a joint between the first and second hollow magnets and the first and second hollow magnets are combined on the two opposite sides of the hollow magnet with opposite magnetic poles, wherein the hollow magnet absorbs the magnetic field lines emitted by the first and second hollow magnets , and make the magnetic flux pass through the hollow coil, and interact with the electromagnetic field generated by the hollow coil to generate electromagnetic thrust to drive the moving part.

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