CN-118980641-B - Automatic detection method and device for optical lens

CN118980641BCN 118980641 BCN118980641 BCN 118980641BCN-118980641-B

Abstract

The application relates to an automatic detection method and device for an optical lens, which can realize automatic detection of imaging effect on the surface of the lens after lens processing, and can rapidly and accurately detect whether the optical performance of the lens can reach the qualified index of the product. Through rotary mechanism's rotation, the multi-angle, diversified formation of image, fixture promotes stability when measuring. The optimal detection position is automatically found, 4 optical mechanisms in the device can automatically change the resolution ratio by the camera, the efficient image capturing speed is high, and the imaging effect is multiple and clear. The device can be applied to a complex array lens, and can also capture complex and various defects of the array lens, such as pits, scratches, distortion and the like, and process and analyze image data. The automatic detection equipment can be connected with production equipment to achieve automatic production of products, automatic detection is integrated and automatic, and self-production and self-detection are achieved.

Inventors

HONG CHAO
Geng Yinchao
LI SHENGWEI
HAN DONG
FAN XIAOTENG

Assignees

超丰微纳科技(宁波)有限公司

Dates

Publication Date: 20260505
Application Date: 20240812

Claims (5)

1. An automatic detection method of an optical lens is characterized in that an automatic detection device of the optical lens is adopted, the automatic detection device comprises a detection table (1), a lens detection assembly is arranged on the detection table (1), and the lens detection assembly comprises an optical imaging component, a camera shooting detection component, a rotatable clamp and a line following moving mechanism; The optical imaging component comprises a plurality of light sources and a plurality of imaging panels (2), wherein the light sources are in one-to-one correspondence with the imaging panels (2), and light rays emitted by the light sources are refracted or reflected by the lenses and propagate along an imaging optical axis; The camera detection component comprises a plurality of cameras (3), the cameras (3) correspond to an imaging panel, the cameras (3) are used for capturing images and converting the images into digital signal data to be transmitted to a computer or an image processing system for realizing automatic detection; The rotatable clamp can be freely rotated and positioned so as to clamp and fix the lens at different angles; The line-following moving mechanism is connected with the rotatable clamp, can enable the rotatable clamp and lenses on the rotatable clamp to move back and forth along a preset carrying path, a plurality of groups of light sources and imaging panels (2) are sequentially arranged along the carrying path, an imaging optical axis intersects with the carrying path, and imaging is achieved when the lenses pass through the imaging optical axis; One of the light sources adopts a laser light source (4) for imaging, and the laser light source (4) and a corresponding camera (3) are fixedly arranged on the detection table (1) through the same fixed bracket (5); The laser light source (4) and the corresponding imaging panel (2) are arranged at a position which is back and staggered with the light sources and the imaging panels (2) of other groups; The method comprises the following operation steps: Step1, conveying products, namely conveying a die with lenses to a manipulator through a discharge conveyor belt; step 2, positioning the mould, namely placing the mould on a positioning rotary table and measuring the height of the mould; step 3, mold parting, namely placing the mold on a mold parting and closing platform for mold parting operation; Step4, after the molding operation is finished, if the previous lens detection is not finished, temporarily placing a new lens on a to-be-detected table, and if the previous lens detection is finished, clamping the lens on the mold or the to-be-detected table on a rotatable clamp; step 5, fixing the lens, namely clamping and fixing the lens on a rotatable clamp, wherein the reference plane of the lens is parallel to the light source; Step 6, imaging the lens through three light sources in sequence, photographing light spots imaged by the three light sources by using a camera in sequence to realize three-time detection, moving the lens to a laser light source to perform laser imaging, photographing the light spots imaged by the laser light source by using the camera to realize the laser imaging test of the optical performance of the product; Step 7, testing the optical performance of the back surface of the lens, namely automatically rotating the lens 180 degrees to the back surface by a rotatable clamp to perform laser imaging detection after laser imaging shooting is completed, and then performing imaging detection once again after the return path passes through the first three light sources; And 8, taking down the lenses, namely taking away the good lenses by the manipulator to the next process after the lenses are detected, automatically clamping the defective products by the manipulator if the defective products exist, placing the defective products in an isolation area, and opening an alarm to remind the defective products.
2. The method for automated inspection of an optical lens of claim 1, wherein said lens is a microlens array.
3. The automated inspection method of an optical lens of claim 1, wherein the linear movement mechanism is a first linear module (6), and the first linear module (6), the light source, and the imaging panel (2) are parallel to each other.
4. An automated inspection method of an optical lens as claimed in claim 3, wherein the plurality of cameras (3) are fixedly mounted on a movable support, a second linear module (7) is disposed between the movable support and the inspection table (1), and the second linear module (7) is parallel to the first linear module (6).
5. The automated inspection method of an optical lens of claim 1, wherein the rotatable fixture comprises a rotating mechanism (8) and a clamping mechanism (9), wherein the rotating mechanism (8) is fixedly arranged on the linear moving mechanism, and the clamping mechanism (9) is fixedly arranged on the rotating mechanism (8).

Description

Automatic detection method and device for optical lens Technical Field The application relates to the technical field of quality detection of optical lenses, in particular to an automatic detection method and device for an optical lens. Background The automatic detection equipment comprises a workbench, a first rotary table and a second rotary table which are respectively connected to the workbench in a rotary mode, wherein a plurality of first jigs, a first upward shooting optical mechanism, a concave surface detection optical mechanism, a chamfer and side surface detection optical mechanism and a lens turning mechanism are sequentially arranged on the periphery of the first rotary table, a plurality of second jigs, a transfer feeding mechanism, a second upward shooting optical mechanism, a code reading mechanism and a concave surface detection optical mechanism are sequentially arranged on the periphery of the second rotary table, and an optical detection mechanism for detecting different flaw types of the optical lenses are in communication connection with an MES system. The general automatic lens detection equipment is only suitable for lenses with single caliber and single defect. By the above-mentioned related art, the applicant believes that the prior art has the following drawbacks: 1) The detection range is limited, and the automatic detection equipment for the optical lenses of different models can have different detection ranges and precision requirements. Some devices may not be able to cover all types of optical lenses or all defect types. 2) Manual detection of defects-for some special or complex defect types (e.g., micro scratches, internal impurities, etc.), automated detection equipment may not be able to completely replace manual detection. 3) The imaging effect is not ideal, the prior art can only be applied to single caliber, and the imaging is only one piece. 4) Light source stability effect the stability of the light source is critical for optical detection. If the light source fluctuates greatly or is unstable, deviation of the detection result may occur. 5) The detection items are few, only the surface defects of the lens can be detected, and the optical performance of the lens can not be tested. 6) The detection efficiency is low, a self-production self-detection environment is absent in the production process, and the detection result can only be subjected to offline data processing. Disclosure of Invention The application provides an automatic detection method and device for an optical lens, which can realize automatic detection of imaging effect on the surface of the lens after lens processing, and can rapidly and accurately detect whether the optical performance of the lens can reach the qualified index of the product. The application provides an automatic detection method and device for an optical lens, which adopts the following technical scheme: an automatic detection device for an optical lens comprises a detection table, wherein a lens detection assembly is arranged on the detection table, and comprises an optical imaging component, a camera shooting detection component, a rotatable clamp and a line following movement mechanism; The optical imaging component comprises a plurality of light sources and a plurality of imaging panels, wherein the light sources and the imaging panels are in one-to-one correspondence with each other, and light rays emitted by the light sources are refracted or reflected by the lenses and spread along an imaging optical axis; the camera shooting detection component comprises a plurality of cameras, the cameras correspond to the forming screen, and the cameras are used for capturing images and converting the images into digital signal data to be transmitted to a computer or an image processing system to realize automatic detection; The rotatable clamp can be freely rotated and positioned so as to clamp and fix the lens at different angles; the line-following moving mechanism is connected with the rotatable clamp, so that the rotatable clamp and lenses on the rotatable clamp can move back and forth along a preset carrying path, a plurality of groups of light sources and imaging panels are sequentially arranged along the carrying path, an imaging optical axis is intersected with the carrying path, and imaging is realized when the lenses pass through the imaging optical axis. Further perfecting, one of the light sources adopts a laser light source for imaging. Further perfecting, the laser light source and a corresponding camera are fixedly arranged on the detection table through the same fixing bracket. Further perfecting, the laser light source and a corresponding imaging panel are arranged at a position which is back to be staggered with other groups of light sources and imaging panels. Further perfecting, the linear moving mechanism is a first linear module, and the first linear module, the light source and the imaging panel are parallel to each o