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Multispectral extra-large aperture telescope objective

A telescopic objective lens and multi-spectral technology, applied in the field of optical equipment, can solve the problems of limiting the use temperature range of the lens, glue hardening, glue opening, etc., and achieve the effects of widening the use temperature range, reducing weight and cost

Active Publication Date: 2018-02-27
JIAXING ZHONGRUN OPTICAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the introduction of glued lenses, it is easy to cause glue opening, glue flow, and glue hardening in extreme high and low temperature environments, which limits the operating temperature range of the lens.

Method used

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  • Multispectral extra-large aperture telescope objective
  • Multispectral extra-large aperture telescope objective
  • Multispectral extra-large aperture telescope objective

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] like figure 1 Shown is a sectional view along the optical axis of the telescopic objective lens of this embodiment. The telescopic objective lens is arranged in order from the object plane side to the image plane side along the incident direction of the light rays, a first lens, a second lens, a third lens, a diaphragm S, a fourth lens, a fifth lens, a sixth lens and The seventh lens, wherein: the first lens is a positive power lens G1 with a front convex and a concave back, the second lens is a positive power lens G2 with a front convex and a concave back, and the third lens is a positive power lens G3 with a front convex and a back concave , the fourth lens is biconcave negative power lens G4, the fifth lens is biconvex positive power lens G5, the sixth lens is positive power lens G6 with front convex and back concave, and the seventh lens is biconcave Negative power lens G7.

[0026] Preferably, a protective mirror CG is provided between the seventh lens and the im...

Embodiment 2

[0036] like image 3Shown is a sectional view along the optical axis of the telescopic objective lens of this embodiment. Compared with Embodiment 1, the diaphragm S in this embodiment is set between the fourth lens and the fifth lens, and the fourth lens is a negative power lens with front convex and rear concave, and the fifth lens is front convex and rear A concave positive power lens, and the seventh lens is a negative power lens with a front concave and a back convex.

[0037] The focal length ratio of the first lens and the optical system |f1 / f|=2.53, the focal length ratio of the second lens and the optical system |f2 / f|=3.70, the focal length ratio of the third lens and the optical system |f3 / f |=1.65, the focal length ratio of the fourth lens and the optical system |f4 / f|=0.49, the focal length ratio of the fifth lens and the optical system |f5 / f|=0.55, the focal length ratio of the sixth lens and the optical system |f6 / f|=0.87, the focal length ratio of the sevent...

Embodiment 3

[0043] like Figure 5 Shown is a sectional view along the optical axis of the telescopic objective lens of this embodiment. Compared with Embodiment 1, the diaphragm S in this embodiment is set between the fourth lens and the fifth lens, and the fifth lens is a positive power lens with front convex and back concave, and the seventh lens is front concave and back convex negative power lens.

[0044] The focal length ratio of the first lens and the optical system |f1 / f|=2.45, the focal length ratio of the second lens and the optical system |f2 / f|=3.11, the focal length ratio of the third lens and the optical system |f3 / f |=1.81, the focal length ratio of the fourth lens and the optical system |f4 / f|=0.48, the focal length ratio of the fifth lens and the optical system |f5 / f|=0.57, the focal length ratio of the sixth lens and the optical system |f6 / f|=0.88, the focal length ratio of the seventh lens and the optical system |f7 / f|=0.65, the focal length ratio of the first, secon...

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Abstract

The invention relates to a multispectral extra-large aperture telescope objective. The multispectral extra-large aperture telescope objective comprises a front-convex and back-concave positive focal power first lens, a front-convex and back-concave positive focal power second lens, a front-convex and back-concave positive focal power third lens, a biconcave or front-convex and back-concave negative focal power fourth lens, a biconcave or front-convex and back-concave positive focal power fifth lens, a front-convex and back-concave positive focal power sixth lens, a biconcave or front-concave and back-convex negative focal power seventh lens and aperture diaphragms which are arranged in sequence from the object plane side to the image plane side, wherein the aperture diaphragms can be located at multiple positions. A conventional method that a glued lens is used for eliminating chromatic aberration of the lens is not adopted, the risk that the phenomena of glue failure, gummosis, glue hardening and the like occur in extremely high and low temperature environments when the glued lens is used is avoided, and the usage temperature range of the lens is widened. By optimizing lens focalpower matching and reasonably selecting lens materials, the overall length of the lens is effectively reduced, the size of the lens is reduced, and the weight of the lens is lowered.

Description

technical field [0001] The present invention relates to a technology in the field of optical equipment, in particular to a miniaturized, light-weight, and low-cost ultra-large-aperture optical lens with low-light imaging function that does not contain laminated lenses and ultra-low dispersion glass. far objective lens. Background technique [0002] With the expansion of the application field of the optical system, the application environment of the objective lens has expanded from the original conventional visible light and photopic light intensity environment to the multi-spectral and low-light environment. The multi-spectral ultra-large aperture telescopic objective lens can be used in visible light and non-visible light environments, not only can provide long-distance photoelectric signals for cameras under special weather conditions such as rain, snow, fog, , Still provide high-resolution video images, effectively improving the monitoring capability and detection range ...

Claims

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Application Information

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IPC IPC(8): G02B13/02
CPCG02B13/02
Inventor 葛航笠厉冰川谢晨李长锋尚洁阳
Owner JIAXING ZHONGRUN OPTICAL TECH
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