Fish-eye lens for doublet lens

Abstract

The invention discloses a fish-eye lens for a doublet lens. The fish-eye lens comprises a lens group which is characterized by comprising a first lens (1), a second lens (2), a third lens (3), a fourth lens (4), a fifth lens (5), a sixth lens (6), a seventh lens (7), an eighth lens (8), a ninth lens (9), a tenth lens (10) and an eleventh lens (11) which are sequentially and coaxially arranged from an object side to an image side; the first lens (1), the second lens (2) and the third lens (3) are spherical lenses having negative diopters and convex surfaces facing the object side; the fourth lens (4) and the fifth lens (5) are aspherical lenses having convex surfaces facing the object side and positive diopters; the sixth lens (6), the seventh lens (7), the eighth lens (8), the ninth lens (9), the tenth lens (10) and the eleventh lens (11) respectively form three groups of doublet lenses. The optical system is simple in structure, good in uniformity of image surface and large in rear operating distance, and can be applied to actual production of cameras for civil use.

Description

Technical field [0001] The design relates to a double cemented lens fisheye lens, which belongs to the optical technology field. Background technique [0002] Fish-eye lenses are mainly used to produce panoramic images based on realistic scenes. At present, high-quality fish-eye lenses are mainly foreign brands, and the prices are very expensive; while the quality of similar domestic products with low prices is often poor, and it is difficult to satisfy consumers Therefore, the design and research of civilian fisheye lenses has always been one of the hot spots in the field of optical design. [0003] The structure of a fisheye lens is generally composed of 8-11 elements. The common ones are: 7 groups of 8 elements (that is, the first and second elements are negative lenses, and the rear group is composed of 5 groups and 6 elements. Positive light group, with a built-in filter near the diaphragm), 8-group 10-element structure (that is, the first 1, 2, and 3 groups are all concave l...

AI Technical Summary

Problems solved by technology

[0004] The above design does not require a filter for visible light, and the extra filter increases the size of the system; two sets of doublet lenses cannot meet the design requirements of good image quality for occasions requiring high pixels

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