Large numerical aperture color separation double telecentric optical system

Abstract

The invention provides a large numerical aperture color separation double telecentric optical system. The large numerical aperture color separation double telecentric optical system comprises a front collimating lens group, a color separation prism, a first focusing lens rear group, a second focusing lens rear group and a third focusing lens rear group which are sequentially arranged from an object plane to a focusing plane; the front collimating lens group comprises a first lens and a second lens which are sequentially arranged along the light incident direction; the color separation prism comprises a first sub-prism, a second sub-prism and a third sub-prism; the first focusing lens rear group comprises a third lens, a fourth lens and a fifth lens; the second focusing lens rear group comprises a sixth lens, a seventh lens and an eighth lens; and the third focusing lens rear group comprises a ninth lens, a tenth lens and an eleventh lens. According to the invention, when the object distance changes slightly, the energy of the receiving end is not changed, equal energy can be obtained uniformly, and the method has the advantage of stable repeatability; continuous information of different chromaticity can be rapidly obtained, the working efficiency of the chromaticity tester is effectively improved, and the detection precision is high.

Description

technical field [0001] The invention relates to a large numerical aperture color separation double telecentric optical system. Background technique [0002] At present, the chromaticity tester used to automatically detect defects such as screen chromaticity and brightness uses an optical system that uses a color wheel to obtain the three primary colors (red, green, blue) signals required by the chromaticity tester. By installing a color wheel between the lens and the focusing surface, the optical system collects the chromaticity and brightness of the three primary colors of the screen under test by switching different filters of the color wheel, and then transmits them to the detector through one-third of optical fibers for detection The chromaticity and brightness of the screen have the advantages of high accuracy and stable test data. [0003] Although the chromaticity tester adopts the color wheel method to have the above advantages, the numerical aperture NA of the opti...

AI Technical Summary

Problems solved by technology

[0003] Although the color wheel method used by the chromaticity tester has the above advantages, the numerical aperture NA of the optical system of the chromaticity tester on the market is less than 0.18. The utilization rate of the brightness of the screen is relatively low; at the same time, the optical system used in many colorimeters is a non-telecentric system or only a telecentric system on the object side, which causes uneven energy and reduces the detection accuracy of the colorimeter; The last color wheel with a filter between the mirror and the focus transmits the optical signals of the three primary colors to the optical fiber, and then transmits them to the detector through a split optical fiber

In order to improve the coupling efficiency of the optical fiber as high as possible, the last lens of the lens will have a larger incident angle to the focusing plane, and the increase of the incident angle will reduce the transmittance of light in the filter of the color wheel and reduce the The use efficiency of the optical signal, because the color wheel needs to continuously switch filters to obtain different three primary colors for analysis and detection, the utilization rate and test efficiency cannot achieve the best results, and the price of the color wheel is also relatively expensive

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