CN211669106U - Optical system for detecting glass surface defects - Google Patents

Abstract

The utility model discloses an optical system for detecting glass surface defects, comprising a continuously variable magnification macro objective lens, a light-shielding sleeve, a microscopic objective lens, a magnification variable device and a CCD camera; the continuous variable magnification macro objective lens and the microscopic objective lens are connected The shading sleeve is connected between the two; the zooming device is connected between the microscope objective and the CCD camera; the CCD camera is connected with the computer; It includes a first sleeve and a second sleeve that are slidably connected, the first sleeve is connected with the microscope objective lens, and the second sleeve is connected with the CCD camera. By adjusting the continuous zoom macro objective lens and the zoom device, the glass surface can be continuously zoomed and imaged, and the magnification of the optical system can be adjusted as needed. Quick detection, eliminate obvious defective products, and realize automatic detection, which is convenient and fast.

Description

An optical system for detecting glass surface defects

technical field

The utility model belongs to the technical field of glass surface detection, in particular to an optical system for detecting glass surface defects.

Background technique

At present, there are two main methods for the detection of glass surface defects. One is manual inspection. The glass surface is directly observed through a stereo microscope, and glass defects are judged according to experience. This method is time-consuming and labor-intensive, relies on the experience of the inspectors, and has no quantitative criteria for discrimination. One method is machine vision inspection, in which defects in glass are automatically identified by machines through digital photography and image processing. This method is fast and efficient, but the current optical systems of machine vision are imaging with low magnification and fixed magnification. Generally, only large defects can be detected, but the defects to be detected cannot be detected according to actual needs. Levels adjust magnification to improve detection efficiency.

SUMMARY OF THE INVENTION

The utility model provides an optical system for detecting glass surface defects, which solves the above problem that the magnification cannot be adjusted according to the defect level to be detected to improve the detection efficiency.

In order to solve the above-mentioned technical problems, the technical scheme adopted by the present utility model is: an optical system for detecting glass surface defects, comprising a continuously variable magnification macro objective lens, a light-shielding sleeve, a microscope objective lens, a magnification variable device, and a CCD camera; The shading sleeve is connected between the continuous variable magnification macro objective lens and the microscope objective lens; the magnification variable device is connected between the microscope objective lens and the CCD camera; the CCD camera is connected with a computer; A zoom ring for changing the magnification and focusing is arranged on the shell of the continuous zooming macro objective lens; the zooming device includes a first sleeve and a second sleeve that are slidably connected, and the first sleeve is The microscope objective lens is connected, and the second sleeve is connected with the CCD camera.

Further, an installation ring is arranged on one end of the continuously variable magnification macro objective lens away from the light shielding sleeve, and a plurality of through holes for installing the laser are evenly distributed on the circumference of the installation ring. Played the role of providing detection light irradiation.

Further, the laser light of the laser has an included angle with the center line of the continuous variable magnification macro objective lens.

Further, the included angle ranges from 30° to 60°. It plays the role of ensuring that the continuously variable magnification macro objective only receives the diffuse reflection light at the defect of the glass to be tested.

Further, the light-shielding sleeve includes a large sleeve and a small sleeve that are slidably connected, the large sleeve is connected with the continuously variable magnification macro objective lens, and the small sleeve is connected with the microscope objective lens. It plays the role of convenient adjustment of the distance between the continuous zoom macro objective and the microscope objective to adapt to the change of magnification.

Further, the end of the second sleeve is provided with a rectangular groove, and the CCD camera is clamped to the second sleeve through the rectangular groove.

Further, the outer surface of the magnification changing device is provided with a magnification scale. Played the role of precise adjustment of magnification.

Further, the large sleeve is connected with the continuously variable magnification macro objective lens through threads, and the small sleeve is connected with the microscope objective lens through threads.

Further, an adjustment knob for sliding the first sleeve and the second sleeve is arranged on the variable magnification device; an adjustment knob for sliding the large and small sleeves is arranged on the light-shielding sleeve.

The beneficial effects achieved by the utility model: the first sleeve and the second sleeve are slidably connected, so that the distance between the microscope objective lens and the CCD camera can be easily adjusted, and the magnification of the microscope objective lens can be continuously adjusted. The shading sleeve can not only isolate stray light, but also adjust the adjustment knob of the shading sleeve to slide the size sleeve, so as to change the distance between the continuous zoom macro objective and the microscope objective to adapt to the change of magnification and obtain clear images. The CCD camera is connected to the computer to automatically detect the defects on the glass surface; by adjusting the continuous zoom macro objective lens and the zoom device, the glass surface can be continuously zoomed and imaged, and the magnification of the optical system can be adjusted according to the defect level to be detected. Fine inspection under magnification to determine whether the glass quality reaches the highest standard, rapid inspection under low magnification to exclude obvious defects. Realize automatic detection, adjust the magnification to adapt to the defect level to be detected, flexible, efficient, convenient and fast.

Description of drawings

Fig. 1 is the structural drawing of the utility model;

Figure 2 is a schematic diagram of the utility model detection.

In the figure: 1- continuous zoom macro objective; 2- shading sleeve; 3- microscope objective; 4- zoom device; 5- CCD camera; 6- laser; 7- adjustment knob; 8- adjustment knob; 9-glass to be tested; 10-shade.

Detailed ways

The present utility model will be further described below in conjunction with the accompanying drawings. The following examples are only used to illustrate the technical solutions of the present invention more clearly, and cannot be used to limit the protection scope of the present invention.

As shown in FIG. 1 , an optical system for detecting glass surface defects includes a continuously variable magnification macro objective lens 1 , a light shielding sleeve 2 , a microscope objective lens 3 , a magnification variable device 4 , and a CCD camera 5 . A light-shielding sleeve 2 is connected between the continuous variable magnification macro objective lens 1 and the microscope objective lens 3; a magnification variable device 4 is connected between the microscope objective lens 3 and the CCD camera 5; and the CCD camera 5 is connected with the computer. A zoom ring for changing the magnification and focusing is set on the lens body shell of the continuous zoom macro objective 1. The zooming device 4 includes a first sleeve and a second sleeve that are slidably connected, the first sleeve is connected to the microscope objective lens 3 , and the second sleeve is connected to the CCD camera 5 . The sliding connection of the first sleeve and the second sleeve makes it convenient to adjust the distance between the microscope objective lens 3 and the CCD camera 5 , so that the magnification of the microscope objective lens 3 can be continuously adjusted. The CCD camera 5 is connected to the computer to automatically detect the surface defects of the glass 9; by adjusting the continuous zoom macro objective 1 and the zoom device 4, the glass surface can be continuously zoomed and imaged, and the magnification of the optical system can be adjusted according to the defect level to be detected. Magnification, fine inspection under high magnification, to determine whether the glass quality reaches the highest standard, rapid inspection under low magnification, to exclude obvious defects. Realize automatic detection, adjust the magnification to adapt to the defect level to be detected, flexible, efficient, convenient and fast.

A mounting ring is arranged on one end of the continuous variable magnification macro objective lens 1 away from the light shielding sleeve 2 , and the mounting ring has several through holes for mounting the laser 6 evenly distributed around the circumference, which plays the role of providing detection light irradiation. The laser light of the laser 6 has a certain angle with the center line of the continuous variable magnification macro objective lens 1 . The included angle prevents the reflected light from entering the continuous variable magnification macro objective lens 1 when the laser is irradiated on the defect-free glass to be tested 9 . The included angle ranges from 30° to 60°, which ensures that the continuously variable magnification macro objective lens 1 only receives the diffusely reflected light at the defect of the glass to be tested 9 . In this embodiment, the angle between the laser light and the center line of the continuous variable magnification macro objective lens 1 is 45 degrees, and multiple lasers 6 can be installed for multi-angle irradiation, and the laser convergence point is located on the center line of the continuous variable magnification macro objective lens 1. , so that various types of defects on the glass can have obvious diffuse reflection.

The light-shielding sleeve 2 includes a large sleeve and a small sleeve that are slidably connected, and an adjusting rotary block 8 for sliding the large and small sleeves is arranged on the light-shielding sleeve 2 . The large sleeve is connected to the continuous zoom macro objective 1, the small sleeve is connected to the microscope objective 3, and the shading sleeve 2 can isolate the stray light, and can also conveniently adjust the zoom of the continuous zoom macro objective 1 and the microscope objective 3. Spacing to adapt to changes in magnification to get clear images. In this embodiment, the large sleeve and the continuously variable magnification macro objective lens 1 are connected by threads, and the small sleeve and the microscope objective lens 3 are connected by threads.

The zoom device 4 is provided with an adjustment knob 7 for sliding the first sleeve and the second sleeve. The end of the second sleeve is provided with a rectangular groove, and the CCD camera 5 is clamped into the rectangular groove, that is, the CCD camera 5 is clamped to the second sleeve through the rectangular groove. The outer surface of the magnification device 4 is provided with a magnification scale, which plays the role of accurately adjusting the magnification.

As shown in FIG. 2, the arrows in the figure indicate the laser direction. During actual use, the entire optical system is covered with a light hood 10 to isolate stray light. The continuously variable magnification macro objective lens 1 is perpendicular to the surface of the glass 9 to be measured. The laser 6 at the end of the continuously variable macro objective lens 1 emits laser light, and the laser light source is incident on the glass to be tested 9 at an angle of 45 degrees. If the glass has no defects, it will be emitted at an angle of 45 degrees; if there are defects, diffuse reflection will occur at the defect, and the continuous zoom macro objective 1 is perpendicular to the surface of the glass 9 to be tested, and can only receive diffuse reflection light at the defect. The continuously variable magnification macro objective lens 1 can focus, adjust the magnification, and form a real image of the glass to be measured 9 to the object surface of the microscope objective lens 3. The light shielding sleeve 2 connects the continuous variable magnification macro objective lens 1 and the microscope objective lens 3 and shields the miscellaneous objects. Astigmatism, the microscope objective 3 is used to enlarge the real image to the photosensitive surface of the CCD camera 5, and the magnification device 4 connects the microscope objective 3 and the CCD camera 5, and changes the magnification by changing the distance between the microscope objective 3 and the CCD camera 5, and at the same time Has the function of shielding stray light. The CCD camera 5 sends the photographed photos to the computer for image processing and identification, and the bright part of the obtained image is defective, and the dark part is free of defects.

During measurement, select the appropriate magnification according to the defect level to be detected, adjust the adjustment knob 7 according to the magnification scale on the zoom device 4, and then turn the zoom ring of the continuous zoom macro objective 1 to focus, so that the image obtained by the CCD camera 5 is clear. , and then image processing by computer. When the magnification changes greatly, sometimes the image cannot be clear no matter how you turn the focusing ring. At this time, you should adjust the adjusting knob 8 on the shading sleeve 2 appropriately, and change the continuous zoom macro objective 1 and display. The spacing of the micro-objectives 3 is adapted to the change of magnification.

The above is only the preferred embodiment of the present invention. It should be pointed out that for those skilled in the art, some improvements and deformations can be made without departing from the technical principle of the present invention. These improvements and deformation should also be regarded as the protection scope of the present invention.

Claims (9)

1. an optical system for detecting glass surface defect, is characterized in that, comprises continuous variable magnification macro objective lens, light-shielding sleeve, microscope objective lens, variable magnification device, CCD camera; The light-shielding sleeve is connected between the continuously variable magnification macro objective lens and the microscope objective lens; The zooming device is connected between the microscope objective lens and the CCD camera; the CCD camera is connected with a computer; A zoom ring for changing the magnification and focusing is arranged on the shell of the continuously variable magnification macro objective lens body; The magnification changing device comprises a first sleeve and a second sleeve which are slidably connected, the first sleeve is connected with the microscope objective lens, and the second sleeve is connected with the CCD camera. 2 . The optical system for detecting glass surface defects according to claim 1 , wherein a mounting ring is arranged on one end of the continuously variable magnification macro objective lens away from the light-shielding sleeve, and the circumference of the mounting ring is evenly distributed. 3 . Several through holes for mounting the laser. 3 . The optical system for detecting glass surface defects according to claim 2 , wherein the laser light of the laser has an included angle with the center line of the continuous variable magnification macro objective lens. 4 . 4 . The optical system for detecting glass surface defects according to claim 3 , wherein the included angle ranges from 30° to 60°. 5 . 5 . The optical system for detecting glass surface defects according to claim 1 , wherein the light-shielding sleeve comprises a large sleeve and a small sleeve that are slidably connected, and the large sleeve and the continuous zoom micro The distance objective lens is connected, and the small sleeve is connected with the microscope objective lens. 6 . The optical system for detecting glass surface defects according to claim 1 , wherein the end of the second sleeve is provided with a rectangular groove, and the CCD camera communicates with the second sleeve through the rectangular groove. 7 . Cartridge snap. 7 . The optical system for detecting glass surface defects according to claim 1 , wherein the outer surface of the magnification device is provided with a magnification scale. 8 . 8 . The optical system for detecting glass surface defects according to claim 5 , wherein the large sleeve is connected with the continuously variable magnification macro objective lens through threads, and the small sleeve is connected with the microscope objective lens 8 . By screw connection. 9 . The optical system for detecting glass surface defects according to claim 5 , wherein an adjustment knob for sliding the first sleeve and the second sleeve is arranged on the magnification device; the light-shielding sleeve An adjusting rotary block for sliding the large and small sleeves is arranged on the barrel.

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