CN110044926A - A kind of lens defect detection device - Google Patents

Abstract

The invention relates to a lens defect detection device, comprising a camera and a lens, a display screen, a ring light source, a transparent flat plate, an electric displacement table, an electric lift table and an electric sliding rail, wherein the camera is connected to the lens and is fixed on the electric displacement table, It can move up and down with the electric displacement stage to adjust the field of view of the camera. It is fixed directly under the lens to assist multi-angle lighting to shoot the lens under test; the transparent plate is fixedly connected to the electric slide rail for placing the test lens. The lens is mounted on the electric slide rail to move the transparent flat plate into and out of the detection equipment; the display screen is fixed on the electric lifting platform for projecting black and white stripes, placed under the transparent plate, and is driven by the electric lifting platform to move up and down to project onto the lens under test superior.

Description

A lens defect detection device

technical field

The invention relates to a lens defect detection device.

Background technique

Lenses are a common type of optical device. However, in the production process of lenses, due to the limitations of equipment and processes, various defects are inevitably generated, which affect their final optical properties. Therefore, before the lens is officially put into use, a detection process needs to be introduced to avoid the defective lens from affecting the final working performance of the device and causing irreparable losses. At present, lens defect detection is often realized by manual inspection. However, manual inspection has the following obvious shortcomings: (1) From the perspective of production technology and cost, manual inspection will introduce unnecessary additional links to production and assembly, which is not conducive to the realization of fully automatic production and assembly, and will also increase labor costs. (2) From the perspective of production efficiency, the manual detection speed is slow and online detection cannot be realized. (3) From the perspective of detection results, the reliability of manual detection cannot be guaranteed, and it is easy to introduce human errors. Visual inspection is more and more widely used in the field of quality inspection in all walks of life, which plays a crucial role in improving inspection efficiency and stability. However, there are still problems in the application of visual inspection in lens defect inspection. For example, the scale of lens defects is often small and difficult to obtain by direct shooting; there are many types of lens defects, and it is difficult to detect all lens defects through a set of systems.

SUMMARY OF THE INVENTION

In view of the above problems, the purpose of the present invention is to provide a fast and reliable automatic detection device for lens defects, so as to realize automatic detection of lens defects, thereby improving production efficiency and reducing costs. The technical solution is as follows:

A lens defect detection device, including a camera and a lens, a display screen, a ring light source, a transparent flat plate, an electric displacement stage, an electric lift table and an electric slide rail, wherein the camera is connected to the lens and is fixed on the electric displacement stage, and moves with the electric displacement table. The stage can move up and down to adjust the field of view of the camera. It is fixed directly under the lens and is used to assist multi-angle lighting to shoot the lens under test; the transparent plate is fixedly connected to the electric slide rail for placing the lens to be inspected. The electric slide rail is equipped with a transparent plate moving in and out detection equipment; the display screen is fixed on the electric lifting platform for projecting black and white stripes, and is placed under the transparent plate.

Preferably, the ring light source includes a ring lampshade and LED lights distributed in different directions.

The present invention has the following advantages due to adopting the above technical solutions:

(1) Since the device integrates the display screen and the LED light source, it can be used for various types of lens defect detection.

(2) The device can be used for different types of lens detection through the displacement stage and the lifting stage.

(3) The structure is located in the sealed casing, which can avoid the influence of dust on the imaging of the camera or the display screen as much as possible, and can avoid the influence of external natural light on the detection.

Description of drawings

Fig. 1 is the lens defect automatic detection structure diagram mentioned in the present invention

Description of the labels in the figure: 1 camera; 2 lens; 3 display screen; 4 LED light source; 5 glass plate; 6 electric displacement stage; 7 electric lift table; 8 electric slide rail; 9 aluminum profile bracket;

Detailed ways

The present invention will be described below with reference to the accompanying drawings and examples.

As shown in FIG. 1 , the lens defect detection device provided by the present invention is mainly composed of a camera 1, a lens 2, a display screen 3, an LED light source 4, a glass plate 5, an electric displacement table 6, an electric lift table 7 and an electric slide rail 8. composition.

The system frame is a gantry structure constructed of aluminum profiles. The electric displacement stage 6 is fixed in the middle of the gantry beam. The camera 1 is connected to the lens 2 and is fixed on the electric displacement stage 6. The electric displacement stage can move up and down to adjust the field of view of the camera. Design a ring lampshade, install four LED light sources 4 inside the lampshade, evenly distributed in four directions, open a ring hole in the center of the rectangular metal plate to reserve the shooting area, connect the ring lampshade and fix it directly under the lens, to assist multiple Angle lighting to shoot the lens under test. The glass plate 5 is fixedly connected to the electric sliding rail 8, the lens to be inspected is placed on the glass plate, and the electric sliding rail carries the movement in and out detection equipment. The display screen 3 is used to project black and white stripes, and it is fixed on the electric lifting platform 7 and placed directly under the glass plate of the system. The outer casing of the whole device is installed to ensure that the measurement environment is close to the dark room environment.

The specific process of detection is as follows: first, the electric slide rail 8 drives the glass plate 5 to extend, and the external device places the lens on the glass plate. Next, the electric sliding rail 8 drives the glass plate 5 to retract, so that the test piece reaches the designated detection position. Then, the display screen 3 displays a series of fringes, the camera 1 cooperates with the telecentric lens 2 to collect the corresponding patterns, and the phase solving algorithm is used to determine whether there are fringes. Finally, the LED light sources 4 are respectively turned on, the camera synchronously collects the corresponding patterns, and the image processing algorithm is used to judge whether there is a defect.

Claims (2)

1. A lens defect detection device, including a camera and lens, a display screen, a ring light source, a transparent flat plate, an electric displacement stage, an electric lift table and an electric slide rail. Among them, the camera connection lens is fixed on the electric displacement stage, which can move up and down with the electric displacement stage to adjust the size of the camera's field of view, and is fixed directly under the lens to assist multi-angle lighting to shoot the lens under test; It is connected to the electric slide rail to place the lens to be inspected. The electric slide rail is equipped with a transparent flat plate to move in and out of the detection equipment; the display screen is fixed on the electric lifting platform for projecting black and white stripes, and is placed under the transparent flat plate. The lift table drives up and down movement to project onto the lens under test. 2 . The device according to claim 1 , wherein the ring light source comprises a ring lampshade and LED lights distributed in different directions. 3 .