Lens

A lens and lens technology, applied in the field of lenses, can solve the problems of insufficient light-gathering ability, increased weight, long lens barrel length, etc., and achieve the effects of improving image quality, being convenient to carry, and reducing the focal ratio value.

Active Publication Date: 2009-11-25
GUANGZHOU BOSMA CORP
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AI Technical Summary

Problems solved by technology

However, the Makesutov-Cassegrain system must make the focal length very long to ensure the image quality and high magnification, so not only the focal ratio is large, but the light collection ability is still slightly insufficient and the length of the lens barrel is relatively long. , which increases the weight, which is not conducive to easy portability

Method used

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Embodiment Construction

[0017] The present invention will be further described below in conjunction with the accompanying drawings.

[0018] figure 1 Shown is the imaging diagram of the Maksutov telescope, the concave surface of the thick meniscus lens 1 faces the side of the incident light, and the concave primary mirror 3 is arranged behind it. A part of the mirror surface on the convex side of the thick meniscus lens 1 is subjected to vacuum evaporation to form a secondary mirror 2 . The incident light enters from the concave surface of the thick meniscus lens 1 and passes through the secondary mirror 2 and the primary mirror 3 to form an image on the focal plane 4 where the focal point f is located.

[0019] figure 2 It is a schematic diagram of the lens layout of the large aperture, short focal ratio reentrant night vision lens system. In this invention, from the object end to the imaging end are arranged in sequence on the same optical axis:

[0020] A first lens 4 with negative refraction...

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Abstract

The present invention provides a backfolding night vision lens with a short coke ratio and a large caliber, provided in sequence from an object end to an imaging end coaxially with a first lens having a pedion negative refracting capability and a pedion reflecting capability; a second lens having a positive refraction capability and a falcate shape; and a third lens having a pedion negative refraction capability and a pedion reflecting ability as well as a falcate shape. A refracting surface of the first lens is connected with a convex surface of the second lens, and a concave surface of the second lens opposites to a concave surface of the third lens. The design of the invention provides a plurality of refractions and reflexions for a light path, it is capable of folding the light path effectively, reducing the coke ratio value effectively without an addition of a lens system length by employing a little lens sets, improving the imaging quality, and cost is low and it is convenient to carry. The invention relates to a lens.

Description

technical field [0001] The invention relates to a lens, in particular to a large-caliber, short-focus-ratio fold-back night vision lens. Background technique [0002] Generally speaking, existing night vision technologies include infrared night vision and low-light night vision. Infrared night vision technology is divided into active infrared night vision technology and passive infrared night vision technology. Active infrared night vision technology is a night vision technology that implements observation by actively illuminating and using the infrared light reflected by the target to reflect the infrared source. The corresponding equipment is an active infrared night vision device. Passive infrared night vision technology is an infrared technology that realizes observation by means of infrared radiation emitted by the target itself. It finds the target according to the temperature difference or thermal radiation difference between the target and the background or each par...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B13/00G02B27/00
Inventor 贺一勋
Owner GUANGZHOU BOSMA CORP
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