CN213543860U

CN213543860U - Automatic focus curved surface glass surface and detect stress appearance

Info

Publication number: CN213543860U
Application number: CN202021984310.9U
Authority: CN
Inventors: 张熠; 彭俊; 李国志
Original assignee: Suzhou PTC Optical Instrument Co Ltd
Current assignee: Suzhou PTC Optical Instrument Co Ltd
Priority date: 2020-09-11
Filing date: 2020-09-11
Publication date: 2021-06-25
Anticipated expiration: 2030-09-11

Abstract

The invention provides an automatic focusing curved glass surface stress detection instrument, which comprises a light source, a light refraction element and an imaging unit, and is characterized in that the imaging unit comprises a lens cone, a C-port focusing lens and a camera, wherein the light refraction element is a refraction prism, is positioned in the light emitting direction of the light source, is arranged on a detection platform of the stress detection instrument and is used for placing glass to be detected, the light source is positioned below the detection platform, emitted light enters the lens cone after being refracted by the light refraction element, and is focused by the C-port focusing lens to form an image in the camera. According to the invention, through the continuous zooming of the C-port adjustable focusing lens, clear bright and dark stress stripes can be conveniently and quickly imaged when plane toughened glass or curved toughened glass is detected, the stress on the surface of the glass is calculated by comparing the position corresponding relation between corresponding bright stripes or dark stripes in the stripe array, and the whole stress meter has the advantages of reasonable structure, convenience in operation, high detection precision, wide universality and wide application prospect.

Description

Automatic focus curved surface glass surface and detect stress appearance

Technical Field

The invention belongs to an optical device, and particularly relates to an automatic focusing curved surface glass surface stress detection instrument.

Background

The toughened glass is formed into compressive stress on the surface of the glass by using a chemical or physical method, and the surface pressure is firstly counteracted when the glass bears external force, so that the bearing capacity is improved, and the toughened glass is widely applied to the fields of building doors and windows, glass curtain walls, electronic instruments and the like. Although the tempered glass has improved bearing capacity due to stress, the stress is usually very uneven, which reduces the mechanical strength and thermal stability of the tempered glass product, affects the safe use of the glass product, and even causes spontaneous explosion in severe cases. For optical glass, the existence of large stress also seriously affects optical light transmittance and imaging quality. Therefore, in order to ensure the safety and usability of the tempered glass product, the stress of the tempered glass is controlled within a specified range, which requires the surface stress of the tempered glass to be detected.

At present, the toughened glass surface stress meter can only detect plane glass generally, when the toughened glass to be detected is the curved surface shape, the total reflection light incident on the toughened glass surface takes place the birefringence under the effect of stress layer, form two bundles of light beams of off-normal direction mutually perpendicular, through the eyepiece, will no longer form clear bright behind the industrial camera, dark stripe, the industrial camera is just can't accurately discern the interval between the stripe when snatching the image, and the position between every stripe, this will directly lead to the calculation result precision low, can't obtain the testing result even, therefore traditional stress detection instrument hardly accurately tests curved surface toughened glass's stress result.

Disclosure of Invention

In view of the above, the invention provides an automatic focusing curved surface glass surface stress detection instrument, which can conveniently and quickly image clear bright and dark stress stripes when detecting plane toughened glass or curved surface toughened glass through continuous zooming of a C-port adjustable focusing lens, and calculate the stress of the glass surface by comparing the position corresponding relation between the corresponding bright stripes or dark stripes in a stripe row.

The specific technical scheme of the invention is as follows:

the utility model provides an automatic focus curved surface glass surface detects stress appearance, includes light source, photorefractive element, imaging element, its characterized in that, imaging element include lens cone, the adjustable focus camera lens in C mouth and camera, photorefractive element is the refraction prism, is located the light emission direction of light source, sets up on the testing platform who detects stress appearance, supplies to place the glass that awaits measuring, the light source is located the testing platform below, the light that sends gets into the lens cone after the refraction of photorefractive element, through the adjustable focus camera lens in the camera formation of image after the focus of C mouth.

Furthermore, the stress detection instrument further comprises an angle adjusting mechanism, one end of the angle adjusting mechanism is fixed on a base of the stress detection instrument, the other end of the angle adjusting mechanism is connected with the lens cone, and the angle of the imaging unit for receiving refracted light can be adjusted through the angle adjusting mechanism.

Furthermore, the C-port adjustable-focus lens realizes a focal length adjusting range of +80 to +200mm in a mode of controlling current by an electronic driver.

Further, testing platform is transparent panel, testing platform below is provided with refraction liquid conduction mechanism, carries refraction liquid to refraction prism surface to export unnecessary refraction liquid to waste liquid recovery bottle through the recovery tube and retrieve.

Additional aspects and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.

Drawings

FIG. 1 is a schematic structural view of an embodiment of an automatic focusing curved glass surface stress tester of the present invention;

the system comprises a light source 1, a refraction prism 2, a lens cone 3, a focus-adjustable lens with a 4-C opening, a camera 5, a detection platform 6, an angle adjusting mechanism 7, a base 8 and a refraction liquid conducting mechanism 9.

Detailed Description

The embodiments described below with reference to the drawings are illustrative only and should not be construed as limiting the invention.

Referring to fig. 1, the auto-focus curved glass surface stress detector of this embodiment, including light source 1, the photorefractive element, the imaging unit includes lens cone 3, adjustable focus lens 4 of C mouth and camera 5, the photorefractive element is refraction prism 2, be located light source 1's light emission direction, the setting is on the testing platform 6 that detects the stress detector, the glass that awaits measuring is placed to the confession, light source 1 is located testing platform 6 below, the light that sends gets into lens cone 3 after the refraction of photorefractive element, take images in the camera after the adjustable focus lens 4 of C mouth is focused.

Preferably, the stress detecting instrument further comprises an angle adjusting mechanism 7, one end of the angle adjusting mechanism is fixed on a base 8 of the stress detecting instrument, the other end of the angle adjusting mechanism is connected with the lens barrel 3, and the angle of the imaging unit for receiving refracted light can be adjusted through the angle adjusting mechanism 7, namely, the imaging positions of the bright and dark stripes on the camera are adjusted.

Preferably, the C-aperture adjustable focus lens 4 realizes a focal length adjustment range of +80 to +200mm in a manner that the electric current is controlled by the electronic driver, and the stress gauge of the embodiment can automatically focus to clearly present the bright and dark stripes on the camera no matter whether the surface of the detected glass sample is a plane or a curved surface, so that the stress parameters of the glass sample can be accurately obtained.

Preferably, testing platform 6 is transparent panel, and testing platform 6 below is provided with refraction liquid conduction mechanism 9, carries refraction liquid to refraction prism surface to export unnecessary refraction liquid to waste liquid recovery bottle through the recovery tube and retrieve.

In this embodiment, the C-interface adjustable-focus lens 4 is used to replace an eyepiece imaging system of a traditional stress gauge, the C-interface adjustable-focus lens 4 is installed between the refraction prism 2 and the camera 5, the C-interface adjustable-focus lens 4 is connected with a computer through a special electronic driver, and a focus adjustment range of +80 mm to +200mm is realized by controlling current, so that a mechanical element and an imaging system are integrated conveniently and easily.

In the actual measurement process, the focal length of the imaging stripe of the toughened glass to be detected when the imaging stripe is clearest is determined through two modes:

(1) when the relevant parameters of the toughened glass sample to be tested are known, the focal length required for clearly imaging the stripes is directly calculated according to a formula; the computer controls the current through the electronic driver to stop the focal distance at the most appropriate position, and the calculation formula is as follows:

f = L/[1+(2nL/R*cosα)]

wherein f: the focal length is L, and the distance from the adjustable focal length lens to the industrial camera chip is L;

n is the refractive index of the refractive prism;

r: the curvature radius of the curved surface toughened glass to be measured at the prism measuring position is measured;

α: the incident light is totally reflected at the critical angle;

(2) when the relevant parameters of the toughened glass sample to be tested are not known, the stress on the surface of the glass can be calculated by driving the adjustable focusing lens to continuously focus within the range of 80-200 focal lengths and comparing the position corresponding relation between the corresponding bright stripes or the corresponding dark stripes in the two groups of stripe arrays according to the actually clearest position of the stripe imaging.

The automatic focusing curved surface glass surface stress detection instrument is reasonable in structural design, clear bright and dark stress stripes can be conveniently and quickly imaged when plane toughened glass or curved surface toughened glass is detected through continuous zooming of the adjustable lens, the detection precision is high, stress on the surface of the glass is calculated by comparing position corresponding relations among corresponding bright stripes or corresponding dark stripes in the stripe rows, and the automatic focusing curved surface glass surface stress detection instrument has a wide application prospect.

While specific embodiments of the invention have been described in detail with reference to exemplary embodiments thereof, it should be understood that numerous other modifications and embodiments can be devised by those skilled in the art that will fall within the spirit and scope of the principles of this invention. In particular, reasonable variations and modifications are possible in the component parts and/or arrangements of the subject combination arrangement within the scope of the foregoing disclosure, the drawings and the appended claims without departing from the spirit of the invention. Except variations and modifications in the component parts and/or arrangements, the scope of which is defined by the appended claims and equivalents thereof.

Claims

1. The utility model provides an automatic focus curved surface glass surface detects stress appearance, includes light source, photorefractive element, imaging element, its characterized in that, imaging element include lens cone, the adjustable focus camera lens in C mouth and camera, photorefractive element is the refraction prism, is located the light emission direction of light source, sets up on the testing platform who detects stress appearance, supplies to place the glass that awaits measuring, the light source is located the testing platform below, the light that sends gets into the lens cone after the refraction of photorefractive element, through the adjustable focus camera lens in the camera formation of image after the focus of C mouth.

2. The auto-focusing curved glass surface stress gauge according to claim 1, wherein the stress gauge further comprises an angle adjusting mechanism, one end of the angle adjusting mechanism is fixed on the base of the stress gauge, the other end of the angle adjusting mechanism is connected with the lens barrel, and the angle of the imaging unit for receiving the refracted light can be adjusted by the angle adjusting mechanism.

3. The auto-focusing curved glass surface stress gauge according to claim 1, wherein the C-port focus adjustable lens realizes a focal length adjustment range of +80 to +200mm by controlling a current through an electronic driver.

4. The automatic focusing curved glass surface stress gauge according to claim 1, wherein the detection platform is a transparent plate, a refraction liquid conducting mechanism is arranged below the detection platform, the refraction liquid is conveyed to the surface of the refraction prism, and the redundant refraction liquid is guided out to a waste liquid recovery bottle through a recovery tube and is recovered.