An automatic measuring device for lens thickness

Abstract

The invention provides an automatic lens thickness measuring device. The lens thickness automatic measurement device includes: a two-dimensional module; a lens tray, the lens tray is installed on one side of the two-dimensional module, and multiple lenses can be placed on the lens tray; a precision motion platform, the A precision motion platform is installed on one side of the lens tray; a non-contact measurement module is installed above the precision motion platform, and the non-contact measurement module is used for non-contact measurement of the lens. Contact measurement; a contact measurement module, the contact measurement module is installed above the precision motion platform, and the contact measurement module is used for contact measurement of the lens. The lens thickness automatic measurement device provided by the invention has the advantages of automatic batch detection, high measurement efficiency and low labor cost.

Description

technical field [0001] The invention relates to the technical field of optical measurement, in particular to an automatic lens thickness measurement device. Background technique [0002] At present, all kinds of aspheric lenses play an irreplaceable role in precision optical products such as military and civilian use, and increasingly strict design indicators make the processing and testing accuracy of aspheric lenses more and more demanding. In the last inspection process of aspheric lenses, the central thickness value of aspheric lenses is one of the key indicators for judging whether aspheric lenses are qualified. At present, the main disadvantages of lens measurement are as follows: [0003] 1) The existing infrared measurement method does not take into account the influence of the shape of the lens on the measurement results. If the curvature of the lens surface is large, there will be gaps, resulting in errors in the measurement results. [0004] 2) In the existing m...

AI Technical Summary

Problems solved by technology

[0003] 1) The existing infrared measurement method does not take into account the influence of the shape of the lens on the measurement results. If the curvature of the lens surface is large, there will be gaps, resulting in errors in the measurement results

[0004] 2) In the existing measuring device, since the edge diameter of the small lens is very small, it is impossible to accurately measure the edge thickness of the lens due to the large focal spot of the sensor when using non-contact measurement

[0006] 4) In the existing measurement devices, the centering method of the lens is either fixed according to the groove, or manually adjusted, and some even only have one-dimensional adjustment, and there is a certain center error

But for aspheric lenses, the curvature will also affect the refractive index, which will bring some trouble and error to the calculation

[0008] 6) In the existing device, the degree of automation is low, and the measurement lens is replaced manually, and the result is interfered by human factors

[0009] Moreover, at present, it mainly relies on manual operation of dial gauges for measurement, which has low measurement efficiency and high labor costs, and there will be certain human factors in manual measurement, resulting in unguaranteed measurement accuracy and stability, and may even scratch the lens; in addition , if the measuring side of the dial indicator is concave, since the measuring rod has a certain diameter, there will be a gap between the lens and the measuring rod during measurement, and the center part cannot be in contact, making the measurement result inaccurate

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