Long-focus lens

A telephoto lens and lens technology, applied in the field of telephoto lenses, can solve the problems of large magnification, small depth of field, etc., and achieve the effect of large magnification, small depth of field, and good aberration correction

Pending Publication Date: 2018-10-12
JIAXING ZHONGRUN OPTICAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Aiming at the problems of the existing telephoto optical system, the present invention proposes a telephoto lens, which solves the influence of field curvature and coma on the telephoto optical system and significantly improves the image quality of the entire picture. This optical device has a small depth of field and a large magnification

Method used

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Examples

Experimental program
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Embodiment 1

[0034] Such as Figure 1 to Figure 3 As shown, the present embodiment discloses a 70mm telephoto lens, which sequentially includes from the object side to the image side along the optical axis direction: a first lens group, a diaphragm S, a second lens group, a protective glass CG and an image surface img.

[0035] In the first lens group: the first lens L1 is a lunar convex spherical lens, including a first spherical surface s1 (convex surface) and a second spherical surface s2 (concave surface); the second lens L2 is a biconvex spherical lens, including a third spherical surface s3 (convex surface) and the fourth spherical surface s4 (convex surface); the third lens L3 is a lunar convex spherical lens, including the fifth spherical surface s5 (convex surface) and the sixth spherical surface s6 (concave surface); the fourth lens L4 is a biconvex spherical lens, Including the sixth spherical surface s6 (convex surface) and the seventh spherical surface s7 (concave surface); t...

Embodiment 2

[0048] Such as Figure 4 to Figure 6 As shown, compared with Embodiment 1, the third lens L3 of this embodiment is a biconcave spherical lens, including a fifth spherical surface s5 (concave surface) and a sixth spherical surface s6 (concave surface).

[0049] The second lens group in this embodiment includes: sixth lens L6, cemented lens L71, L72, wherein: the sixth lens is a biconcave aspherical lens, including the eleventh aspheric surface s11 (concave surface) and the twelfth aspheric surface The spherical surface s12 (concave surface); the cemented lens L7 is a lunar convex spherical lens, including a fourteenth spherical surface s14 (concave surface) and a sixteenth spherical surface (convex surface) s16.

[0050] The specific parameters of the lens in this embodiment are as follows

[0051] Table 2:

[0052]

[0053]

[0054] In this embodiment, the sixth lens L6 adopts a plastic aspheric surface, wherein: the coefficient of the aspheric surface satisfies:

[0...

Embodiment 3

[0063] Such as Figure 7 to Figure 9 As shown, compared with Embodiment 2, the second lens of this embodiment is a biconvex spherical lens, including the third spherical surface s3 (convex surface) and the fourth spherical surface s4 (concave surface); the fifth lens is a biconcave spherical lens, including Eighth spherical surface s8 (concave surface) and ninth spherical surface s9 (concave surface).

[0064] The second lens group in the present embodiment includes: the sixth lens L6, the seventh lens L7 and the eighth lens L8, wherein: the sixth lens is a biconcave aspheric lens, including the eleventh aspheric surface s11 (concave surface) and The twelfth aspherical surface s12 (concave surface); the seventh lens L7 is a biconcave spherical lens, including the fourteenth spherical surface s13 (concave surface) and the fourteenth spherical surface s14 (concave surface); the eighth lens L8 is a biconvex spherical lens, including Fourteenth spherical surface s15 (convex surfa...

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Abstract

The invention relates to a long-focus lens. The long-focus lens comprises a first lens group,an optical lens group and a second lens group in sequence from the object side to the image side in the optical axis direction,wherein the second lens group comprises at least one non-spherical lens or two gluing lenses. The optical device solves the effects of field curvature and coma on the long-focus optical system and remarkably improves the image quality of the whole picture,and has a small depth of field and a large magnification.

Description

technical field [0001] The invention relates to a technology in the field of optical devices, in particular to a telephoto lens. Background technique [0002] At present, for high-definition lenses with long-distance small target surfaces and long focal lengths, civilian SLR telephoto lenses are generally used instead. This type of lens is designed with a large target area, and the resolution of the small target area imaging device will be greatly reduced, and the structure is complex and expensive. Therefore, it is necessary to design a special small target area, simple structure, low price and high imaging quality. The lens is specially used to capture the details of distant objects. For telephoto lenses, field curvature and coma aberration are the main phase differences affecting phase quality. The larger the field curvature and coma aberration, the worse the image quality of the peripheral field of view will be. Therefore, it is difficult to ensure uniform and good imag...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B13/18G02B13/00G02B1/04
CPCG02B1/041G02B13/00G02B13/18
Inventor 吴冬芹尚洁阳盛亚茗
Owner JIAXING ZHONGRUN OPTICAL TECH
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