High-contrast high-acutance medical miniature near-infrared blood vessel visualization lens

Abstract

The invention relates to the technical field of thin optical lens assemblies in medical instruments, in particular to a high-contrast high-acutance medical miniature near-infrared blood vessel visualization lens, which comprises four optical lenses, a diaphragm and an infrared filter, wherein the four optical lenses are divided into three groups; the first group comprises two lenses and consists of a positive lens and a negative lens which are the first and second slices; the face type of the positive lens is convex on the front and convex on the back; the face type of the negative lens is convex on the front and concave on the back; the diaphragm is arranged between the positive lens and the negative lens; the second group is a positive lens which is concave on the front and convex on the back and is the third slice; the third group is a negative lens and is the fourth slice, the first face of the negative lens is a convex face, and the second face of the negative lens is a concave face; the four lenses are all aspherical; the infrared filter is arranged on one side of the third group of negative lens. On the premise of miniaturization, the contrast and the acutance of the lens can be improved to the maximum, edge parameters are limited, and the stability for processing and forming the lens is greatly improved.

Description

technical field [0001] The invention relates to the technical field of thin optical lens groups in medical instruments, more specifically, to a high-contrast and high-sharp medical miniature near-infrared blood vessel development lens. Background technique [0002] In recent years, there are more and more applications of optical lenses, and their volume is getting smaller and smaller, and at the same time, the imaging resolution is getting higher and higher. In mobile product applications, miniature lenses have become very popular to meet the ever-increasing usage demands. This technology also has many patents, especially in mobile products such as mobile phones, it has been widely favored. [0003] But most microlenses image in the visible spectrum, and are intended only for taking pictures. Infrared lenses used in medical detection, especially in blood vessel imaging, need to provide a certain quality of contrast and sharpness in order to obtain accurate detection data. ...

AI Technical Summary

Problems solved by technology

Because under the processing of micro lenses, the molding quality is closely related to the shape, and most of the current aspheric lenses cannot solve this problem well.

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