Concentricity correction device and method for lens and vcm assembly

Abstract

The application discloses a concentricity correction device and method for lens and VCM assembly, which comprises a base and a camera arranged above the base, wherein the base is provided with a VCM positioning structure, and a lens positioning piece is movably arranged on the base; a pin header is movably arranged on one side of the base, and a plurality of pins are horizontally arranged on the pin header; the camera is electrically connected with a concentricity detection and control module, the concentricity detection and control module is electrically connected with a VCM driving module, and the VCM driving module is electrically connected with the plurality of pins. In the application, the concentricity detection and control module can detect the concentricity of the lens and the voice coil motor according to the image captured by the camera, calculate the offset, and make the VCM driving module control the voice coil motor to move the lens seat horizontally by a corresponding distance according to the offset, so that the concentricity of the lens seat and the lens is adjusted, and a separate adjusting mechanism is not needed, thereby reducing the equipment cost.

Description

Technical Field

[0001] This invention belongs to the field of camera assembly, and in particular relates to a concentricity correction device and method for assembling a lens and a VCM. Background Technology

[0002] When assembling a VCM (Voice Coil Motor) and lens using a threadless fastening device, a positioning structure is set up on the fastening device to position the VCM and lens before assembly. However, this method results in low concentricity accuracy between the VCM and lens, and the relative concentricity cannot be adjusted. Some threadless fastening devices adjust the concentricity of the VCM and lens by moving the lens after positioning the VCM. However, this requires a component for lens movement on the threadless fastening device, increasing the cost; furthermore, the lens movement component needs to be calibrated before use, making the adjustment process relatively complex. Summary of the Invention

[0003] In view of the shortcomings of the prior art, the technical problem to be solved by the present invention is to provide a concentricity correction device and method for assembling a lens and a VCM.

[0004] To solve the above-mentioned technical problems, the present invention provides the following technical solution:

[0005] A concentricity correction device for assembling a lens and a voice coil motor (VCM) includes a base and a camera positioned directly above the base. The base has a VCM positioning structure and a lens positioning component that is movably mounted on it, with one end of the lens positioning component extending vertically upwards through the upper surface of the base. A pin header is movably mounted on one side of the base at a position corresponding to the pins of a voice coil motor, and multiple pins are horizontally mounted on the pin header. The camera is electrically connected to a concentricity detection and control module, which is electrically connected to a VCM drive module. The VCM drive module is also electrically connected to the multiple pins. The concentricity detection and control module is used to detect the concentricity of the lens and the voice coil motor based on an image captured by the camera and calculate the offset. Based on the offset, the module causes the VCM drive module to issue an adjustment command, which controls the voice coil motor to move the lens mount horizontally by a corresponding displacement.

[0006] Furthermore, the lens positioning component includes a cylindrical support body with an adsorption through hole for connecting to a negative pressure device.

[0007] Furthermore, the support body is connected to a first driving device, which is used to drive the support body to move in the vertical direction.

[0008] Furthermore, the radius of the support is adapted to the bottom radius of the lens.

[0009] Furthermore, the VCM positioning structure is a VCM groove, the shape of which is adapted to the shape of the voice coil motor.

[0010] Furthermore, a notch is provided on one side of the VCM groove at the position corresponding to the pin of the voice coil motor, and the pin header moves between the initial position and the working position; when the pin header is in the initial position, the pin header is outside the notch, and when the pin header is in the working position, the pin header is in the notch, and the pin is in contact with the pin of the voice coil motor.

[0011] Furthermore, the pin header is connected to a second driving device, which drives the pin header to move horizontally between an initial position and a working position.

[0012] A concentricity correction method for lens and VCM assembly, employing a concentricity correction device for lens and VCM assembly, includes the following steps:

[0013] S1. Place the voice coil motor on the VCM positioning structure of the base;

[0014] S2. Fix the lens onto the lens positioning piece;

[0015] S3. Drive the lens positioning component to move, so that the lens is moved to the position where it is assembled with the lens mount of the voice coil motor; drive the pin header to move, so that the pins contact the pins of the voice coil motor.

[0016] S4. The camera captures images of the lens and voice coil motor and sends them to the concentricity detection and control module;

[0017] S5. The concentricity detection and control module detects the concentricity between the lens and the voice coil motor and calculates the offset. If there is no offset, proceed to step S7; otherwise, proceed to step S6.

[0018] S6. The concentricity detection and control module causes the VCM drive module to output a corresponding adjustment command based on the offset. The voice coil motor controls its lens mount to move horizontally by the corresponding displacement according to the adjustment command. Then, return to execute step S4.

[0019] S7. The calibration is complete and the calibration is deemed successful.

[0020] Furthermore, before performing step S6, the following steps are performed first:

[0021] S610. Determine whether the number of adjustments is less than the preset number of adjustments threshold. If it is less than the preset number of adjustments threshold, proceed to step S620; otherwise, proceed to step S630.

[0022] S620: Increment the adjustment count by 1, and execute step S6;

[0023] S630. Restore the number of adjustments to the initial value, end the calibration, and determine that the calibration failed.

[0024] Furthermore, the threshold number of times is 3 times.

[0025] In this invention, the concentricity of the voice coil motor and the lens is automatically identified by a concentricity detection and control module. A pin header is set up to bring the pins of the voice coil motor out to the outside through pins. A VCM drive module is set up to drive and control the voice coil motor. The position of the lens mount can be adjusted directly through the adjustment structure inside the voice coil motor, thereby adjusting the concentricity of the lens mount and the lens. There is no need to set up a separate adjustment mechanism on the calibration device, which reduces the equipment cost and makes the concentricity adjustment more accurate. Attached Figure Description

[0026] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0027] Figure 1 This is a schematic diagram of an embodiment of the concentricity correction device for assembling a lens and a VCM according to the present invention.

[0028] Figure 2 for Figure 1 Exploded view.

[0029] Figure 3 This is a schematic diagram of the pin header in the working position.

[0030] Figure 4 This is a block diagram of the electrical connections for the concentricity correction device.

[0031] Figure 5 This is a flowchart of an embodiment of the concentricity correction method for lens and VCM assembly according to the present invention.

[0032] Figure 6 This is a schematic diagram showing the concentricity of the lens and the voice coil motor being offset.

[0033] Figure 7 This is a schematic diagram showing the concentricity of the lens and the voice coil motor without any offset.

[0034] The diagrams in the instruction manual are labeled as follows:

[0035] Camera-100; Base-200; VCM groove-211; Positioning component through hole-212; Notch-213; Support body-220; Adsorption through hole-221; Protruding ring-222; Pin header seat-230; Pin-231; Concentricity detection and control module-300; VCM drive module-400; Voice coil motor-500; Housing-510; Internal frame-520; Light transmission hole-521; Pin-530; Lens-600. Detailed Implementation

[0036] The following specific examples illustrate the implementation of the present invention. The illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0037] Please see Figure 1 , Figure 1 This is a schematic diagram of an embodiment of the concentricity correction device for lens and VCM assembly according to the present invention. The concentricity correction device for lens and VCM assembly in this embodiment includes a base 200 and a camera 100 disposed directly above the base 200. The camera 100 and the base 200 can be fixed by a bracket (not shown in the figure). Please refer to... Figure 2 and Figure 3 The base 200 is provided with a VCM positioning structure. In this embodiment, the VCM positioning structure is a VCM groove 211. The shape of the VCM groove 211 is adapted to the shape of the voice coil motor 500 so that the voice coil motor 500 can be placed in the VCM groove 211, thereby achieving coarse positioning of the voice coil motor 500 through the VCM groove 211.

[0038] In this embodiment, the voice coil motor 500 is an OISVCM (Optical Image Stabilizer Voice Coil Motor) that allows the lens mount to move within a small range to achieve image stabilization. The OISVCM mainly includes a housing 510 and an internal frame 520 (which serves as the lens mount for connecting the lens 600) connected to the housing 510 via an elastic element. A light-transmitting hole 521 is provided in the center of the internal frame 520. Multiple magnetic coils are disposed on the housing 510, and magnets are disposed in the internal frame 520 corresponding to the positions of the magnetic coils. By adjusting the magnetic force of the magnetic coils, the magnetic attraction between the coils and the magnets controls the movement of the internal frame 520. This OISVCM is an existing module, and the above structure is a conventional structure for OISVCMs; its specific structure and principle will not be elaborated here.

[0039] Please continue reading. Figure 1 and Figure 2A lens positioning component is movably mounted on the base 200, with one end of the lens positioning component extending vertically upwards through the upper surface of the base 200. In this embodiment, a positioning component through hole 212 is vertically provided on the base 200. The lens positioning component includes a cylindrical support body 220, which passes through the positioning component through hole 212. A raised ring 222 is provided at the lower part of the support body 220, thereby limiting the upward movement distance of the support body 220. An adsorption through hole 221 is vertically provided on the support body 220. The adsorption through hole 221 is used to connect to a negative pressure device (such as a vacuum device), thereby generating negative pressure in the adsorption through hole 221 through the negative pressure device, firmly adsorbing the lens 600 onto the support body 220. The radius of the support body 220 is the same as the bottom radius of the lens 600, thereby achieving coarse positioning of the lens 600 by aligning the lens 600 with the support body 220.

[0040] To facilitate the vertical movement of the support body 220, the support body 220 is connected to a first driving device (not shown in the figure). The first driving device is used to drive the support body 220 to move in the vertical direction so as to adjust the installation height of the lens 600. For example, the first driving device can be a stepper motor to precisely control the position of the support body 220.

[0041] Please continue reading. Figure 2 and Figure 3 A pin header 230 is movably disposed on one side of the base 200 at the position corresponding to the pin 530 of the voice coil motor 500, and a plurality of pins 231 are horizontally inserted through the pin header 230. In this embodiment, a notch 213 is provided on one side of the VCM groove 211 at the position corresponding to the pin 530 of the voice coil motor 500, and the pin header 230 moves between an initial position and a working position; when the pin header 230 is in the initial position, the pin header 230 is outside the notch 213, and when the pin header 230 is in the working position, the pin header 230 is in the notch 213, and the pins 231 are in contact with the pin 530 of the voice coil motor 500.

[0042] In this embodiment, the needle header 230 is connected to a second driving device (not shown in the figure). For example, the second driving device can be a cylinder, which drives the needle header 230 to move horizontally between an initial position and a working position. When the output end of the cylinder retracts inward, the needle header 230 is in the initial position; when the output end of the cylinder extends outward, the needle header 230 is in the working position.

[0043] Please see Figure 4The camera 100 is electrically connected to a concentricity detection and control module 300, which is electrically connected to a VCM drive module 400. The VCM drive module 400 is electrically connected to the plurality of pins 231. The concentricity detection and control module 300 is used to detect the concentricity of the lens 600 and the voice coil motor 500 based on the image captured by the camera 100 and calculate the offset. Based on the offset, the VCM drive module 400 issues an adjustment command, which controls the voice coil motor 500 to move its lens mount horizontally by a corresponding displacement.

[0044] To facilitate the application of adhesive to fix the lens 600, a cover plate (not shown in the figure) may also be provided on the base 200. The cover plate is provided with a lens 600 through hole. The diameter of the lens 600 through hole is larger than the diameter of the lens 600. When the lens 600 is fixed on the lens positioning component, an annular adhesive application area is formed between the lens 600 and the hole wall of the lens 600 through hole.

[0045] The concentricity correction device of this embodiment can automatically identify the concentricity of the voice coil motor 500 and the lens 600 through the camera 100 and the concentricity detection and control module 300. The pins 530 of the voice coil motor 500 are led out to the outside through the pin header 230 and the pins 231. The VCM drive module 400 can drive and control the voice coil motor 500. The position of its lens mount can be adjusted directly through the adjustment structure inside the voice coil motor 500, thereby adjusting the concentricity of the lens mount and the lens 600. There is no need to set up a separate adjustment mechanism on the correction device, thereby reducing the equipment cost and making the concentricity adjustment of the lens 600 and the voice coil motor 500 more accurate.

[0046] Please see Figure 5 , Figure 5 This is a flowchart of an embodiment of the concentricity correction method for lens and VCM assembly according to the present invention. The concentricity correction method for lens and VCM assembly in this embodiment employs the concentricity correction device for lens and VCM assembly described in any of the above embodiments, and includes the following steps:

[0047] S1. Place the voice coil motor 500 on the VCM positioning structure of the base 200. The voice coil motor 500 is an OISVCM. For example, when the VCM positioning structure is a VCM groove 211 that matches the shape of the voice coil motor 500, placing the voice coil motor 500 in the VCM groove 211 can perform coarse positioning of the voice coil motor 500. At this time, the pins 530 of the voice coil motor 500 are located in the notch 213 to facilitate connection through the pin header 230, and the light-transmitting hole 521 of the voice coil motor 500 is aligned with the positioning through hole 212 of the base 200.

[0048] S2. Fix the lens 600 onto the lens positioning component. The lens 600 is a threadless lens 600. For example, when the lens positioning component includes a cylindrical support 220, and the support 220 is provided with an adsorption through hole 221, the support 220 passes through the positioning component through hole 212 of the base 200 and the light-transmitting hole 521 of the voice coil motor 500 from bottom to top. Place the lens 600 on the upper end of the support 220 and align the edge of the lens 600 with the edge of the support 220. Then, the negative pressure device forms a negative pressure in the adsorption through hole 221, thereby fixing the lens 600 onto the support 220.

[0049] S3. The first driving device drives the lens positioning component to move vertically, moving the lens 600 to the position where it is assembled with the lens mount of the voice coil motor 500. The second driving device drives the pin header 230 to the working position, causing the pin 231 to contact the pin 530 of the voice coil motor 500. At this time, the VCM driving module 400 is electrically connected to the pin 530 of the voice coil motor 500 through the pin header 230, thereby allowing control of the voice coil motor 500 through the VCM driving module 400.

[0050] S4. Camera 100 captures images of lens 600 and voice coil motor 500 and sends them to concentricity detection and control module 300.

[0051] S5. The concentricity detection and control module 300 detects the concentricity of the lens 600 and the voice coil motor 500 and calculates the offset. If there is no offset, proceed to step S7; otherwise, proceed to step S6. Please refer to [link to relevant documentation]. Figure 6 This is a schematic diagram illustrating a misalignment between the concentricity of the lens 600 and the voice coil motor 500. Please refer to [link / reference]. Figure 7 This is a schematic diagram showing the completion of concentricity correction between lens 600 and voice coil motor 500, with no offset.

[0052] S6. The concentricity detection and control module 300 causes the VCM drive module 400 to output the corresponding adjustment command according to the offset. The voice coil motor 500 controls its lens mount to move horizontally by the corresponding displacement according to the adjustment command (generally, the displacement is decomposed into displacement in the x-axis direction and displacement in the y-axis direction to control the lens mount to move along the x-axis direction and y-axis direction respectively); return to execute step S4.

[0053] To avoid wasting resources by repeatedly performing concentricity adjustments when the lens 600 or voice coil motor 500 itself is defective and cannot complete the concentricity adjustment, an initial value and a threshold value for the number of adjustments can be preset. For example, the initial value for the number of adjustments can be set to "0", and the threshold value can be set to "3". Before performing this step, the following steps can be performed first:

[0054] S610. Determine if the number of adjustments is less than a preset threshold. If it is less than the preset threshold, proceed to step S620. Otherwise, it indicates that the lens 600 or the voice coil motor 500 itself has a defect and cannot complete the concentricity adjustment, and proceed to step S630.

[0055] S620. Increase the number of adjustments by 1, execute step S6, and adjust the concentricity.

[0056] S630: Restore the number of adjustments to the initial value, end the concentricity correction of the lens 600 and voice coil motor 500, and determine that the correction has failed.

[0057] S7. Calibration complete, and successful calibration determined. At this point, the lens 600 can be fixed to the lens mount of the voice coil motor 500 by applying adhesive and UV curing. Then, the negative pressure device is stopped, causing the lens 600 to detach from the support 220. The first drive device drives the support 220 downwards out of the light-transmitting hole 521 of the voice coil motor 500, and the second drive device drives the pin header 230 to move to its initial position. The installed lens 600 and voice coil motor 500 can then be removed.

[0058] In this embodiment, by directly driving and controlling the voice coil motor 500, the position of the lens mount can be adjusted directly through the adjustment structure inside the voice coil motor 500 according to the concentricity deviation, thereby adjusting the concentricity of the lens mount and the lens 600. There is no need to set up an adjustment mechanism separately on the calibration device, which not only reduces equipment costs, but also makes the concentricity adjustment more accurate.

[0059] The above embodiments merely illustrate preferred implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention should be determined by the appended claims.

Claims

1. A concentricity correction device for assembling a lens and a VCM, characterized in that: The system includes a base and a camera positioned directly above the base. The base has a VCM positioning structure and a lens positioning component that is movably mounted on it, with one end of the lens positioning component extending vertically upwards through the upper surface of the base. A pin header is movably mounted on one side of the base corresponding to the pins of the voice coil motor, with multiple pins horizontally mounted on the pin header. The camera is electrically connected to a concentricity detection and control module, which is electrically connected to a VCM drive module. The VCM drive module is also electrically connected to the multiple pins. The concentricity detection and control module is used to detect the concentricity between the lens and the voice coil motor based on the image captured by the camera and calculate the offset. Based on the offset, the module causes the VCM drive module to issue an adjustment command, which controls the voice coil motor to move the lens mount horizontally by a corresponding displacement. The VCM positioning structure is a VCM groove, the shape of which is adapted to the shape of the voice coil motor. A notch is provided on one side of the VCM groove at the position corresponding to the pin of the voice coil motor. The pin header moves between the initial position and the working position. When the pin header is in the initial position, it is outside the notch. When the pin header is in the working position, it is in the notch and the pin is in contact with the pin of the voice coil motor.

2. The concentricity correction device for assembling a lens and a VCM as described in claim 1, characterized in that: The lens positioning component includes a cylindrical support body with an adsorption through hole for connecting to a negative pressure device.

3. The concentricity correction device for assembling a lens and a VCM as described in claim 2, characterized in that: The support is connected to a first driving device, which is used to drive the support to move in the vertical direction.

4. The concentricity correction device for assembling a lens and a VCM as described in claim 2, characterized in that: The radius of the support is matched with the bottom radius of the lens.

5. The concentricity correction device for assembling a lens and a VCM as described in claim 1, characterized in that: The pin header is connected to a second driving device, which drives the pin header to move horizontally between an initial position and a working position.

6. A method for concentricity correction in lens and VCM assembly, characterized in that, The concentricity correction device for assembling a lens and a VCM as described in any one of claims 1 to 5 includes the following steps: S1. Place the voice coil motor on the VCM positioning structure of the base; S2. Fix the lens onto the lens positioning piece; S3. Drive the lens positioning component to move, so that the lens is moved to the position where it is assembled with the lens mount of the voice coil motor; drive the pin header to move, so that the pins contact the pins of the voice coil motor. S4. The camera captures images of the lens and voice coil motor and sends them to the concentricity detection and control module; S5. The concentricity detection and control module detects the concentricity between the lens and the voice coil motor and calculates the offset. If there is no offset, proceed to step S7; otherwise, proceed to step S6. S6. The concentricity detection and control module causes the VCM drive module to output a corresponding adjustment command based on the offset. The voice coil motor controls its lens mount to move horizontally by the corresponding displacement according to the adjustment command. Then, return to execute step S4. S7. The calibration is complete and the calibration is deemed successful.

7. The concentricity correction method for lens and VCM assembly as described in claim 6, characterized in that, Before performing step S6, the following steps must be performed first: S610. Determine whether the number of adjustments is less than the preset number of adjustments threshold. If it is less than the preset number of adjustments threshold, proceed to step S620; otherwise, proceed to step S630. S620: Increment the adjustment count by 1, and execute step S6; S630. Restore the number of adjustments to the initial value, end the calibration, and determine that the calibration failed.

8. The concentricity correction method for lens and VCM assembly as described in claim 7, characterized in that: The threshold number of times is 3.

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