Small light low-light-level night vision eyepiece optical system

Abstract

The invention relates to a small light low-light-level night vision eyepiece optical system, and belongs to the technical field of design of optical systems. The eyepiece optical system comprises three groups of four coaxial optical lenses, an aperture and an image plane, wherein the aperture, a first lens, a second lens, a third lens, a fourth lens and the image plane are coaxially and sequentially arranged along the optical axis direction from the human eye observation side to the eyepiece image plane side. The first lens, the second lens and the fourth lens are positive lenses while the third lens is a negative lens. The second lens and the third lens are a double cemented lens group and the lens group is a negative lens. The image plane has bending characteristics. According to the compact eyepiece optical system consisting of the three groups of four coaxial optical lenses, the aperture and the image plane, after the constraint optimization of the radius of curvature of each lens, the mutual distance and material properties, the properties of the optical system are ensured, and simultaneously, the barrel length and the total length are shortened, and the weight is reduced.

Description

technical field [0001] The invention relates to a light and small low-light night-vision eyepiece optical system, which belongs to the technical field of optical system design. Background technique [0002] In the current night vision system, the low-light night vision goggles are passive detection and have a delicate picture, which is suitable for human observation and can effectively improve the user's surrounding situational awareness. Usually in use, the night vision goggles are often installed on the helmet in a helmet-wearing manner to free the user's hands for other operations. Because it is worn on the head, if the weight or size is too large, frequent use will cause certain injuries to the user. In order to improve ergonomics, it is required that the night vision goggles should be as light and small as possible. It should be ensured that the optical system has good imaging performance. Most of the currently used eyepieces are long in overall length, heavy in weigh...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a light and small low-light night vision eyepiece optical system to solve the problem that the current low-light night vision eyepiece optical system is difficult to simultaneously meet the dual requirements of performance indicators and ergonomics

Images