VCM zoom lens assembling equipment based on active alignment technology

Abstract

The invention discloses a VCM zoom lens assembling device based on an active alignment technology, which is characterized in that a zoom detection mechanism with a near-field relay lens and a far-field relay lens is arranged on one side of a lens active alignment mounting mechanism, so that the lens active alignment mounting mechanism can be assembled without changing the position of a target surface; and a near-field relay lens or a far-field relay lens is moved to a position corresponding to the assembled VCM zoom lens through a relay lens adjusting mechanism in the zoom detection mechanism, so that near-field and far-field imaging quality detection can be quickly realized, and middle-field imaging quality detection can be realized under the condition of not using the relay lens (without the relay lens).

Description

Technical Field

[0001] The invention relates to an assembly device for an optical lens, in particular to an assembly device for a VCM zoom lens based on an active alignment technology. Background Art

[0002] VCM (Voice Coil Motor) is called voice coil motor in electronics. It is a kind of motor. It is called voice coil motor because its principle is similar to that of speakers. The main principle of voice coil motor is to control the stretching position of spring sheet by changing the DC current of the coil in the motor in a permanent magnetic field, so as to drive the components to move up and down. It has the characteristics of high frequency response and high precision. In VCM zoom lens, the above components correspond to part of the lens in the base under the lens. At present, VCM zoom lens is widely used in mobile phone cameras to realize autofocus function. Through VCM, the position of the lens can be adjusted to present a clear image.

[0003] Active alignment technology, also known as the AA process (Active Alignment), is a technology that determines the relative position of parts during assembly. That is, when assembling each part, the semi-finished product to be assembled will be inspected, and the semi-finished product will be actively aligned according to the actual situation of the semi-finished product to be assembled, and then the next part will be assembled in place. Recently, this technology has been widely used in the assembly of various optical lenses.

[0004] VCM zoom lens Figure 1 As shown, it is assembled from a compensation lens group 31 and a lens lower substrate 32, wherein the lens lower substrate 32 is composed of a lens group 322 and a VCM321. The VCM321 drives some lenses in the lens lower substrate to move up and down, thereby realizing the structural change of the lens position in the lens lower substrate and achieving the purpose of lens zoom. The assembly of a VCM zoom lens usually requires imaging quality testing at three different focal lengths: near, medium, and far field to determine whether the assembled lens meets the use requirements. This often requires the VCM power-on device to control some lenses in the VCM lens lower substrate under the I2C (Inter-Integrated Circuit) protocol to achieve the adjustment of the lens focal length. However, the existing optical lens assembly equipment cannot be applied to the automated assembly of VCM zoom lenses. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide an assembly device for a VCM zoom lens based on an active alignment technology which can be used for the automated assembly of the VCM zoom lens.

[0006] The technical solution adopted by the present invention to solve the above technical problems is: an assembly device of a VCM zoom lens based on active alignment technology, comprising an active lens alignment installation mechanism, a zoom detection mechanism is arranged on one side of the active lens alignment installation mechanism, the zoom detection mechanism comprises a relay lens clamping mechanism and a relay lens adjustment mechanism, the relay lens clamping mechanism clamps a near-field relay lens and a far-field relay lens; the up and down direction of the assembly device is defined as the Z-axis direction, the left and right direction in a plane perpendicular to the Z-axis is defined as the Y-axis direction, the front and back direction in a plane perpendicular to the Z-axis is defined as the X-axis direction, the relay lens adjustment mechanism comprises a zoom detection X-axis direction, and the zoom detection mechanism comprises a relay lens clamping mechanism and a relay lens adjustment mechanism. The zoom detection X-axis module is used to drive the entire zoom detection mechanism to move along the X-axis so that the near-field relay mirror or the far-field relay mirror is moved to the top of the assembled VCM zoom lens to perform near-field or far-field zoom detection. The near-field adjustment module is used to align the Y-axis coordinate of the near-field relay mirror with the assembled VCM zoom lens and adjust the Z-axis height of the near-field relay mirror. The far-field adjustment module is used to align the Y-axis coordinate of the far-field relay mirror with the assembled VCM zoom lens and adjust the Z-axis height of the far-field relay mirror.

[0007] Compared with the prior art, the advantage of the present invention lies in that a zoom detection mechanism having a near-field relay lens and a far-field relay lens is arranged on one side of the lens active alignment mounting mechanism. Without changing the target surface position, the near-field relay lens or the far-field relay lens is moved to the position corresponding to the assembled VCM zoom lens through the relay lens adjustment mechanism in the zoom detection mechanism, so that near-field and far-field imaging quality detection can be quickly achieved. Without using a relay lens (without a relay lens), mid-field imaging quality detection can be achieved.

[0008] Preferably, the relay mirror clamping mechanism includes a near-field relay mirror clamping frame for clamping the near-field relay mirror and a far-field relay mirror clamping frame for clamping the far-field relay mirror. The near-field relay mirror and the far-field relay mirror are extended in an offset manner along the X-axis direction and the distance is relatively fixed. The near-field relay mirror clamping frame and the far-field relay mirror clamping frame make the near-field relay mirror and the far-field relay mirror not overlap. Through the relay mirror clamping mechanism, the relative orientation and displacement direction of the near-field and far-field relay mirrors are consistent. By moving in a single direction at different distances, the switching of the three modes of no relay mirror, near-field relay mirror, and far-field relay mirror can be realized, and the imaging quality detection of the mid-field, near-field, and far-field can be carried out.

[0009] Preferably, the near-field adjustment module includes a near-field Y-axis module and a near-field Z-axis module, the near-field Y-axis module is used to align the Y-axis coordinate of the near-field relay lens with the VCM zoom lens after assembly, and the near-field Z-axis module is used to adjust the Z-axis height of the near-field relay lens, and the far-field adjustment module includes a far-field Y-axis module and a far-field Z-axis module, the far-field Y-axis module is used to align the Y-axis coordinate of the far-field relay lens with the VCM zoom lens after assembly, and the far-field Z-axis module is used to adjust the Z-axis height of the far-field relay lens.

[0010] Preferably, the lens active alignment installation mechanism includes a lower substrate platform, an image acquisition module and a dispensing curing mechanism, the lower substrate platform is provided with a lower substrate fixing device and a power-on adjustment device for fixing the lower substrate of the lens, the power-on adjustment device is used to adjust the Z-axis height of the lens when the lens is installed, and perform defocus scanning, the lower substrate platform is provided with a lower substrate platform driving mechanism, which is used to drive the lower substrate of the lens and the image acquisition module to synchronously move linearly along the Y axis, and drive the image acquisition module to move linearly along the X axis. The power-on adjustment device of the VCM zoom lens adopts a two-wire structure to transmit data through the I2C protocol, including a data line and a clock line (i.e., SDA and SCL lines), wherein the SDA (Seria / Data) line is used for bidirectional data transmission, and the SCL (Seria / Clock) line is used for the clock signal of synchronous data transmission. Communication is always controlled by the master device (Master), and the slave device (Slave) passively receives and responds. This simple line connection method makes it very easy to interconnect devices.

[0011] Preferably, the lower substrate fixing device includes a lower substrate fixing frame and a lower substrate fixing cylinder, and the lower substrate of the lens is fixed on the output shaft of the lower substrate fixing cylinder. The lower substrate platform realizes the power-on and fixation of the VCM zoom lens synchronously through the mechanical design of the lower substrate fixing frame and the fixed cylinder pushing the voice coil motor probe, reduces the deviation introduced in the lens assembly process, and can ensure the repeatability of the position of the lower substrate of the lens each time the material is loaded; during the assembly process, only the compensation group lens is adjusted, and the position of the lens group on the lower substrate of the lens is not adjusted; during the dispensing process, the lower substrate platform driving mechanism drives the image acquisition module to move together with the lower substrate of the lens, and the position of the image acquisition module and the lower substrate of the lens is always relatively fixed. The relative fixed position of the two can avoid the additional error introduced during assembly and detection due to the change of the position of the lens group on the lower substrate of the lens during active alignment and dispensing, and improve the overall repeatability and yield rate of the equipment.

[0012] Preferably, the power-on adjustment device comprises a power-on adjustment frame and a voice coil motor probe for supplying power to the voice coil motor.

[0013] Preferably, the lens active alignment installation mechanism further includes a clamp and a clamp driving mechanism, wherein the clamp clamps the compensation lens group, and the clamp driving mechanism is used to drive the clamp to adjust the level, tilt and height of the compensation lens group. By controlling the power-on adjustment device, combined with the clamp clamping the compensation lens group, the automatic assembly of the VCM focusing lens can be realized to improve production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the structure of the VCM zoom lens product; Figure 2 It is a schematic diagram of the three-dimensional structure of the assembly equipment of the VCM zoom lens based on the active alignment technology of the present invention; Figure 3 It is a three-dimensional structural schematic diagram of the zoom detection mechanism in the assembly equipment; Figure 4 A schematic diagram of the three-dimensional structure of the lower base platform in the lens active alignment installation mechanism of the assembly device; Figure 5 A schematic diagram of the three-dimensional structure of a power-on adjustment device in an active lens alignment installation mechanism of an assembly device; Figure 6 A schematic diagram of the three-dimensional structure of the clamping jaws and the clamping jaw driving mechanism in the lens active alignment installation mechanism of the assembly device; Figure 7 A schematic diagram of the three-dimensional structure of the dispensing mechanism in the active lens alignment installation mechanism of the assembly equipment. DETAILED DESCRIPTION

[0015] The present invention is further described in detail below with reference to the accompanying drawings.

[0016] Example: Figure 2 As shown, an assembly device of a VCM zoom lens based on active alignment technology includes a lens active alignment installation mechanism 1 and a zoom detection mechanism 2 arranged on one side of the lens active alignment installation mechanism 1. The zoom detection mechanism 2 is as shown in FIG. Figure 3 As shown, it includes a relay mirror clamping mechanism 21 and a relay mirror adjustment mechanism 22. The relay mirror clamping mechanism 21 includes a near-field relay mirror clamping frame 211 for clamping a near-field relay mirror and a far-field relay mirror clamping frame 212 for clamping a far-field relay mirror. The near-field relay mirror and the far-field relay mirror are extended and offset along the X-axis direction and the distance is relatively fixed. The near-field relay mirror clamping frame 211 and the far-field relay mirror clamping frame 212 make the near-field relay mirror and the far-field relay mirror not overlap.

[0017] In the present invention, the up and down direction of the assembly equipment is defined as the Z-axis direction, the left and right direction in the plane perpendicular to the Z-axis is defined as the Y-axis direction, and the front and rear direction in the plane perpendicular to the Z-axis is defined as the X-axis direction. The relay lens adjustment mechanism 22 includes a zoom detection X-axis module 221, a near-field adjustment module 222, and a far-field adjustment module 223. The zoom detection X-axis module 221 is used to drive the entire zoom detection mechanism 2 to move along the X-axis so that the near-field relay lens or the far-field relay lens is moved to the top of the VCM zoom lens after the assembly is completed, so as to perform near-field or far-field zoom detection. The near-field adjustment module Group 222 includes a near-field Y-axis module 2221 and a near-field Z-axis module 2222. The near-field Y-axis module 2221 is used to align the Y-axis coordinate of the near-field relay lens with the VCM zoom lens after assembly, and the near-field Z-axis module 2222 is used to adjust the Z-axis height of the near-field relay lens. The far-field adjustment module 223 includes a far-field Y-axis module 2231 and a far-field Z-axis module 2232. The far-field Y-axis module 2231 is used to align the Y-axis coordinate of the far-field relay lens with the VCM zoom lens after assembly, and the far-field Z-axis module 2232 is used to adjust the Z-axis height of the far-field relay lens.

[0018] The lens active alignment installation mechanism 1 comprises a lower base platform 11, a clamping claw 12, an image acquisition module 13 and a glue curing mechanism 14. Figure 4 As shown, a lower substrate fixing device 113 and an electric adjustment device 112 for fixing the lower substrate of the lens are provided, and the electric adjustment device 112 and the lower substrate fixing device 113 are as shown in FIG. Figure 5 As shown, the lower base fixing device 113 is provided with a fixed frame 1131 and a fixed frame 1131 and a fixed cylinder 11321132, the lower base of the lens is fixed on the output shaft of the fixed cylinder 1132, and the lower base platform 11 is provided with a lower base platform driving mechanism 111, and the lower base platform driving mechanism 111 includes a lower base platform Y-axis module 1111 and a lower base platform X-axis module 1112, and the lower base platform Y-axis module 1111 is used to drive the lower base of the lens and the image acquisition module 13 to perform linear motion synchronously along the Y-axis, and the lower base platform X-axis module 1112 drives the image acquisition module 13 to perform linear motion along the X-axis.

[0019] The power-on adjustment device 112 includes a power-on adjustment frame 1121 and a voice coil motor probe 1122 for powering the voice coil motor, which is used to adjust the Z-axis height of the lens when the lens is installed and perform defocus scanning. The power-on adjustment device of the VCM zoom lens uses a two-wire structure to transmit data through the I2C protocol, including a data line and a clock line (i.e., SDA and SCL lines), where the SDA (Seria / Data) line is used for bidirectional data transmission, and the SCL (Seria / Clock) line is used for the clock signal of synchronized data transmission. Communication is always controlled by the master device (Master), and the slave device (Slave) passively receives and responds. This simple line connection method makes it very easy to interconnect devices. The image acquisition module 3 is arranged on the image acquisition module 3. The mechanical design of the lower substrate fixing frame 1131 and the fixed cylinder 1132 push the voice coil motor probe 1122 to synchronously realize the power-on and fixation of the VCM zoom lens, reduce the deviation introduced in the lens assembly process, and ensure the repeatability of the position of the lens lower substrate each time the material is loaded; during the assembly process, only the compensation group lens is adjusted, and the position of the lens group on the lens lower substrate is not adjusted; during the dispensing process, the first platform driving mechanism drives the image acquisition module 13 to move together with the lens lower substrate, and the image acquisition module 13 is always relatively fixed with the lens lower substrate. The relative fixed positions of the two can avoid the additional errors introduced during assembly and detection due to the change of the lens group position on the lens lower substrate during active alignment and dispensing, and improve the overall repeatability and yield rate of the equipment.

[0020] like Figure 6 As shown, the clamping jaw 12 holds the compensation lens group, and the clamping jaw 12 is provided with a clamping jaw driving mechanism 121. The clamping jaw driving mechanism 121 includes a clamping jaw Y-axis module 1211, a clamping jaw X-axis module 1212, a clamping jaw Z-axis module 1213, a clamping jaw Ty-axis module 1214 and a clamping jaw Tx-axis module 1215, which are used to drive the clamping jaw 12 to adjust the level, tilt and height of the compensation lens group. The lens active alignment installation mechanism 1 can realize the automatic assembly of the VCM focusing lens by controlling the power-on adjustment device 112, combined with the clamping jaw 12 holding the compensation lens group, to improve production efficiency.

[0021] The glue dispensing and curing mechanism 14 includes a glue dispensing mechanism 141 and a UV curing mechanism 142. The glue dispensing mechanism 141 is as follows: Figure 7 As shown, the UV curing mechanism 142 is Figure 4 The UV curing mechanism 142 is composed of four UV curing lamps and is fixed on the power-on adjustment device 112, so that the lens can be cured immediately after assembly.

[0022] The working principle of the assembly device of the present invention is as follows: When in use, it is necessary to manually place the lower substrate of the lens on the lower substrate platform 11, and place the compensation group lens on the compensation group loading tooling to start running the equipment.

[0023] The clamp driving mechanism 121 controls the movement of the clamp 12 to clamp the compensation lens group on the loading tooling and adjust it to a preset initial position. The initial position is where the lens actively aligns above the mounting mechanism 1 to avoid collision when the base under the lens moves horizontally.

[0024] 3. The lower substrate platform Y-axis module 1111 automatically moves inward, the VCM part of the lens is pressed by the lower substrate fixture 113 and powered on by the VCM probe 1122, and some lenses in the lower substrate of the lens are adjusted to the corresponding position of the midfield by the preset voltage, and the lens group is adjusted to the midfield structure. The lower substrate of the lens is moved to the preset assembly position of the lower substrate of the lens through the lower substrate platform Y-axis module 1111, and the clamping claw Z-axis module 1213 controls the compensation group lens to move to the assembly position of the compensation group lens.

[0025] 4. The target surface is imaged to the acquisition module 13 through the VCM lens, and the power-on adjustment device 112 performs a mid-field defocus scan according to a preset defocus scan range. According to the scan result, the compensation group lens is assembled through the clamp drive mechanism 121.

[0026] 5. After assembly is completed, the clamping claw Z-axis module 1213 controls the compensation group lens to rise to a safe position for avoidance, and records the Z-axis position before avoidance. The lower substrate platform Y-axis module 1111 drives the lower substrate of the lens to move forward to the bottom of the dispensing mechanism 141 for dispensing.

[0027] 6. After the dispensing is completed, the lower substrate platform Y-axis module 1111 drives the lower substrate of the lens back to the bottom of the compensation group lens, and the clamping claw Z-axis module 1213 controls the compensation group lens to return to the Z-axis position before avoidance, and is cured by the UV curing mechanism 142.

[0028] 7. After UV curing is completed, the clamp releases the compensation lens group, and the midfield position defocus scanning test is performed again by powering on the adjustment device 112.

[0029] 8. After the midfield position test result is confirmed, the zoom detection X-axis module 221 moves the near-field relay mirror to just above the lens, adjusts the lens group to the near-field structure through the power-on adjustment device 112, and performs defocus scanning.

[0030] 9. After the near-field position test results are confirmed, the zoom detection X-axis module 221 moves the far-field relay lens to just above the assembled VCM zoom lens, adjusts the lens group to the far-field structure through the power-on adjustment device 112, and performs a defocus scan.

[0031] 10. After the far-field position test results are confirmed, the clamping claw Z-axis module 1213 controls the compensation group lens to rise to a safe position for avoidance. The assembled VCM zoom lens is withdrawn through the lower substrate platform driving mechanism 111, and the VCM probe 1122 lower substrate fixing device 113 withdraws from the lens lower substrate.

Claims

1. An assembly device for a VCM zoom lens based on active alignment technology, comprising a lens active alignment installation mechanism, characterized in that A zoom detection mechanism is arranged on one side of the lens active alignment installation mechanism, and the zoom detection mechanism includes a relay lens clamping mechanism and a relay lens adjustment mechanism, and the relay lens clamping mechanism clamps a near-field relay lens and a far-field relay lens; the up-down direction of the assembly device is defined as the Z-axis direction, the left-right direction in the plane perpendicular to the Z-axis is defined as the Y-axis direction, and the front-back direction in the plane perpendicular to the Z-axis is defined as the X-axis direction, and the relay lens adjustment mechanism includes a zoom detection X-axis module, a near-field adjustment module and a far-field adjustment module, and the zoom detection X-axis module It is used to drive the entire zoom detection mechanism to move along the X-axis so that the near-field relay mirror or the far-field relay mirror is moved to the top of the assembled VCM zoom lens to perform near-field or far-field zoom detection. The near-field adjustment module is used to align the Y-axis coordinate of the near-field relay mirror with the assembled VCM zoom lens and adjust the Z-axis height of the near-field relay mirror. The far-field adjustment module is used to align the Y-axis coordinate of the far-field relay mirror with the assembled VCM zoom lens and adjust the Z-axis height of the far-field relay mirror.

2. The assembly device of a VCM zoom lens based on active alignment technology as claimed in claim 1, characterized in that The relay mirror clamping mechanism comprises a near-field relay mirror clamping frame for clamping a near-field relay mirror and a far-field relay mirror clamping frame for clamping a far-field relay mirror. The near-field relay mirror and the far-field relay mirror are extended in an offset manner along the X-axis direction and the distance is relatively fixed. The near-field relay mirror clamping frame and the far-field relay mirror clamping frame prevent the near-field relay mirror from overlapping the far-field relay mirror.

3. The assembly device of a VCM zoom lens based on active alignment technology as claimed in claim 1, characterized in that The near-field adjustment module includes a near-field Y-axis module and a near-field Z-axis module. The near-field Y-axis module is used to align the Y-axis coordinate of the near-field relay lens with the VCM zoom lens after assembly, and the near-field Z-axis module is used to adjust the Z-axis height of the near-field relay lens. The far-field adjustment module includes a far-field Y-axis module and a far-field Z-axis module. The far-field Y-axis module is used to align the Y-axis coordinate of the far-field relay lens with the VCM zoom lens after assembly, and the far-field Z-axis module is used to adjust the Z-axis height of the far-field relay lens.

4. The assembly device of a VCM zoom lens based on active alignment technology as claimed in claim 1, characterized in that The lens active alignment and installation mechanism includes a lower substrate platform, an image acquisition module and a dispensing and curing mechanism. The lower substrate platform is provided with a lower substrate fixing device and a power-on adjustment device for fixing the lower substrate of the lens. The power-on adjustment device is used to adjust the Z-axis height of the lens when the lens is installed and perform defocus scanning. The lower substrate platform is provided with a lower substrate platform driving mechanism, which is used to drive the lower substrate of the lens and the image acquisition module to perform linear motion synchronously along the Y-axis, and drive the image acquisition module to perform linear motion along the X-axis.

5. The assembly device of a VCM zoom lens based on active alignment technology as claimed in claim 4, characterized in that The lower base fixing device comprises a lower base fixing frame and a lower base fixing cylinder, and the lower base of the lens is fixed on the output shaft of the lower base fixing cylinder.

6. The assembly device of a VCM zoom lens based on active alignment technology as claimed in claim 4, characterized in that The power-on adjustment device comprises a power-on adjustment frame and a voice coil motor probe for supplying power to the voice coil motor.

7. The assembly device of a VCM zoom lens based on active alignment technology as claimed in claim 4, characterized in that The lens active alignment installation mechanism also includes a clamp and a clamp driving mechanism, the clamp clamps the compensation lens group, and the clamp driving mechanism is used to drive the clamp to adjust the level, inclination and height of the compensation lens group.

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