Lobster eye lens for restricting generation of stray light by adopting light-absorbing coating

Abstract

The invention relates to a lobster eye lens for restricting the generation of stray light by adopting a light-absorbing coating, belonging to the technical field of bionic optics. In the prior art, stray light is reflected to cause fuzzy images. The lobster eye lens comprises a plurality of micro-channel tubes in the shape of a regular square pyramid with a cone-apex angle alpha, inner walls of four isosceles trapezoidal sides of the regular square pyramid are used as reflecting walls, the outer margins of the micro-channel tubes are formed by four edges at the bottom surface of the regular square pyramid, the outer margin of each micro-channel tube is arranged on a sphere with a radius r1, the inner margins of the micro-channel tubes are formed by four edges at the top surface of the regular square pyramid, the inner margin of each micro-channel tube is arranged on sphere with a radius r2, the reflecting wall of each micro-channel tube is coated with an outer margin light-absorbing coating ring belt with a width s1 inwards from the outer margin, the reflecting wall of each micro-channel tube is coated with an inner margin light-absorbing coating ring belt with a width s2 inwards from the inner margin, and an included angel beta is formed between marginal rays of incident micro-channel tube parallel light e close to one side of an incident light optic axis and the reflecting walls below the micro-channel tubes.

Description

technical field The invention relates to a lobster-eye lens that uses a light-absorbing coating to suppress the generation of stray light. The lobster-eye lens is a microchannel tube array reflection superposition imaging optical element, and the optical system using the lobster-eye lens is a lobster-eye simulation optical system. The invention can suppress the generation of stray light in a lobster eye simulation optical system, and belongs to the technical field of bionic optics. technical background The lobster eye lens is composed of several microchannel tubes 1, as shown in Fig. 1, and each microchannel tube 1 has its own optical axis. The microchannel tube 1 is in the shape of a regular quadrangular prism with an apex angle of α. The inner walls of the four isosceles trapezoidal sides of the regular quadrangular prism are reflective walls 2, and the four sides of the bottom surface of the regular quadrangular prism form the outer edge of the microchannel tube 1. The o...

AI Technical Summary

Problems solved by technology

However, in the lobster eye simulation optical system, there are obvious stray light, and there are many types, including background light and reflected stray light. The reflective wall 2 is greater than or equal to the reflected light of three reflections, and the even reflection diverges, and the odd reflection converges. Therefore, the reflected stray light can also be divided into converging and diverging types.

For example, the reflected light reflected twice or more by the relative reflective wall 2 becomes stray light, as shown in Figure 3, the incident light from an object enters the parallel light e of a certain microchannel tube 1, and part of the parallel light e 1 After four reflections, it is far away from the focal point of the lobster eye lens, and does not irradiate on the imaging spherical focal surface 3 of the lobster eye lens. It is a divergent stray light, which does not directly affect the imaging quality. However, it continues to reflect multiple times inside the lobster eye simulation optical system. It will also harm the image quality, and it still needs to be suppressed; there are also some parallel lights e 2 After three reflections, it is projected to the imaging spherical focal surface 3 of the lobster eye lens. It is a converging stray light that converges near the imaging spherical focal surface 3, which has a serious impact on the imaging quality, such as blurring the image, or poor observation due to bright spots. to imaging, need to focus on suppressing

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