Lightweight eyepiece system for low-light night vision goggles

Abstract

The invention relates to a lightweight eyepiece system suitable for low-light night vision goggles, which belongs to the field of optical technology. From the human eye to the display device, the lightweight eyepiece system arranges the diaphragm, the first lens, the second lens and the image surface of the display device coaxially in sequence along the optical axis, wherein the first lens and the second lens are both glass lenses, and the second lens is a glass lens. The first surface of one lens is an aspheric surface, the first surface of the second lens is an aspherical surface; the image surface of the display device is a curved image surface with R=40mm. The eyepieces of the lightweight eyepiece system meet the focal length range of 24mm-28mm, the exit pupil distance range of 20mm-30mm, and the exit pupil diameter is less than or equal to φ12mm. The exit pupil diameter of the eyepiece of the invention is larger than that of common eyepieces, the exit pupil distance is long, and the viewing angle is large. Two aspheric glass lenses are adopted, the structure is simple and compact, and the eyepiece has good ergonomics.

Description

technical field [0001] The invention relates to a lightweight eyepiece system suitable for low-light night vision goggles, which belongs to the field of optical technology. Background technique [0002] Low-light night vision goggles are a special telescope with an image intensifier, which is composed of an objective lens, an image intensifier and an eyepiece. It is a vision aid for the eyes in dark night conditions. Its working principle: the weak night sky light is reflected from the target surface into the low-light night vision goggle, and under the action of the objective lens, it focuses on the photocathode surface of the image intensifier to excite photoelectrons; The fluorescent screen of the image intensifier is bombarded at a very high speed to excite strong enough visible light, which is further amplified by the eyepiece to achieve more effective visual observation. [0003] Direct-looking low-light night vision goggles are all observed through the eyepiece, so t...

AI Technical Summary

Problems solved by technology

The objective lens and eyepiece of ordinary telescopes can cooperate to eliminate aberrations, but low-light night vision goggles are different. Because the image is transmitted through the image intensifier in the middle, the eyepiece can only eliminate aberrations alone, and the fluorescent screen of the image intensifier generally has φ18mm, which is relatively large. Ordinary telescopes are larger, so the structure of low-light night vision goggles will be more complicated than ordinary telescopes

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