Long exit pupil distance eyepiece lens

By designing a long exit pupil distance eyepiece lens composed of six lenses with a specific configuration, the problem of short exit pupil distance in traditional eyepieces has been solved, achieving a longer exit pupil distance and high imaging quality, making it suitable for special fields such as firearm sight systems.

CN122449752APending Publication Date: 2026-07-24CHENGDU JINGPIN NIGHT VISION OPTOELECTRONICS TECHNOLOGY CO LTD
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Patent Information

Application Number
CN202610708683.9
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-05-21
Publication Date
2026-07-24

AI Technical Summary

Technical Problem

Traditional eyepieces have a short exit pupil distance, which makes them inconvenient to use in special applications such as military and special operations, and increasing the exit pupil distance will lead to serious off-axis aberrations.

Method used

Design a long exit pupil distance eyepiece lens composed of six lenses in a specific configuration, including the first to the sixth lens, with the optical power and spacing of each lens allocated, the exit pupil diameter is 8mm, the exit pupil distance is 50mm, the lens material is glass, the field of view is ≥37.8°, and the imaging circle diameter is ≥26.2mm.

Benefits of technology

It achieves a longer exit pupil distance, improving safety and avoiding the risk of eye damage from gun recoil, while maintaining a small size, light weight, and high imaging quality.

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Abstract

The invention provides an eyepiece lens with a long exit pupil distance, the exit pupil diameter is 8 mm, the exit pupil distance is 50 mm, and the eyepiece lens is composed of a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens which are sequentially arranged from the eye side to the image side along an optical axis; the first lens is a biconvex lens; the second lens has positive focal power, the eye side surface is a convex surface, and the image side surface is a concave surface; the third lens has positive focal power, the eye side surface is a convex surface, and the image side surface is a concave surface; the fourth lens has negative focal power, the eye side surface is a convex surface, and the image side surface is a concave surface; the fifth lens is a biconvex lens; the sixth lens has negative focal power, the eye side surface is a concave surface, and the image side surface is a plane. Through the distribution of the focal power of each lens and the interval between the lenses, the eyepiece lens has the advantages of small size, light weight, long total optical length, long exit pupil distance, good imaging quality and stable performance, is especially suitable for a 1.03 inch target surface, and meets the application requirements of special fields.
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