Large-view-field high-image-quality monitoring optical system with compact structure

By adopting Pancake optical system and polarization imaging technology in the monitoring optical system, combining foldback lenses and foldback compensation lenses, the existing large-field optical system has solved the problem of poor structural compactness and insufficient image quality in the monitoring field, and achieved a compact and high-image quality large-field imaging effect.

CN119689714AActive Publication Date: 2025-03-25CHANGCHUN UNIV OF SCI & TECH
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Patent Information

Application Number
CN202411900175.8
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-23
Publication Date
2025-03-25
Estimated Expiration
2044-12-23

AI Technical Summary

Technical Problem

In the application of existing large field of view optical systems in the field of monitoring, there are problems such as poor structural compactness, insufficient weight, and poor image integrity and fidelity.

Method used

The structural compactness and polarization imaging technology of Pancake optical system are adopted, and the imaging optical path is compressed through the combination of foldback lens and foldback compensation lens, reducing the overall optical length, and optimizing the image quality through a double-glued relay mirror group.

Benefits of technology

While achieving large-field imaging, the volume and weight of the monitoring optical system are significantly reduced, the integrity and fidelity of the image are improved, and the monitoring system needs for high image quality and large field of view are met.

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Abstract

The invention discloses a large-view-field high-image-quality monitoring optical system with a compact structure, and belongs to the technical field of monitoring optical systems. In the prior art, higher requirements on view field size, imaging quality, structural compactness, weight and volume cannot be met. A linear polarizing film LP, a front quarter-wave film QWP1, a beam splitting film BP, a turn-back lens with negative focal power, a rear quarter-wave film QWP2, a reflective polarizing film RP, a turn-back compensation lens with negative focal power and a double-gluing subsequent lens group are sequentially arranged along an optical axis from an object side to an image side; the turn-back compensation lens is separated from the doublet subsequent lens group; the ratio of the total optical length TTL of the monitoring optical system to the tangent tan (HFOV) of the half field angle HFOV meets the relational expression of 9 mmlt; tTL / tan (HFOV) lt; 17 mm; the ratio of the maximum effective half aperture D of the turn-back lens to the focal length f of the monitoring optical system meets the relational expression: 0.5 lt; d / flt; and 0.9. The total optical length TTL is only 96.4 mm; the maximum half field angle HFOVmax can reach 96.3 degrees, and the maximum half field angle HFOVmax can reach 96.3 degrees; and the MTF (Modulation Transfer Function) can reach more than 0.48 at 60lp / mm.
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