Optical system of light low-light night vision device

Abstract

The invention relates to a light low-light level night vision device optical system. The optical system comprises an eyepiece system, an image intensifier and an objective lens system, wherein the eyepiece system comprises a positive refractive power balsaming lens and a positive refractive power plastic non-spherical single lens which are successively arranged coaxially along a direction from eyes to a target optical axis; and the objective lens system comprises a first negative refractive power single lens, a second positive refractive power single lens, a third positive refractive power single lens, a fourth positive refractive power single lens, a fifth positive refractive power single lens, a sixth negative refractive power single lens, a diaphragm, a seventh positive refractive powerbalsaming lens and an eighth positive refractive power single lens which are coaxially and successively arranged along a direction from an optical axis to an object side. The light low-light level night vision device optical system has excellent properties of short length, light weight, small size, long distance of exit pupil, large diameter of exit pupil and high resolution ratio, and is particularly suitable for handheld or helmet type monocular and binocular low-light level night vision devices.

Description

technical field [0001] The invention belongs to the technical field of optical systems, in particular to a light low-light night vision optical system, in particular to an optical system in a hand-held or helmet-type monocular and binocular low-light night vision device. Background technique [0002] Handheld or helmet-mounted monocular and binocular low-light night vision device is a special telescope with an image intensifier, which consists of an objective lens, an image intensifier and an eyepiece. It is a vision aid for the eyes under dark night conditions. Its working principle: It is made according to the physical principle of the photoelectric effect. The weak night sky light is reflected from the target surface into the low-light night vision mirror, and is focused on the photocathode surface of the image intensifier under the action of the objective lens to excite the photoelectrons; then After the photoelectrons enter millions of microchannels, electron multiplica...

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Problems solved by technology

[0011] In order to solve the above problems, the present invention provides a light-weight low-light night vision optical system, which is suitable for the objective lens system and eyepiece system of an 18mm image intensifier, and is especially suitable for hand-held or helmet-mounted monocular and binocular low-light night vision devices. , to solve the problem that the current low-light night vision optical system is difficult to take into account both performance indicators and ergonomics

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