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Focus-reducing and light-enhancing additional mirror

A technology of adding mirrors and lenses, applied in optics, optical components, televisions, etc., can solve the problems of limited number of objective lenses, small distance between objective lens and reducer, etc., and achieve the effect of large working distance and compact structure

Pending Publication Date: 2020-09-04
SHENZHEN JYC TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, the distance between the objective lens and the reducer is small, and the number of applicable objective lenses is limited to a certain extent.

Method used

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  • Focus-reducing and light-enhancing additional mirror
  • Focus-reducing and light-enhancing additional mirror
  • Focus-reducing and light-enhancing additional mirror

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0066] figure 1 It is the layout of Example 1 of the present disclosure, which is a focus reduction and enhancement mirror with a focal length of 71.80mm and a magnification of 0.71x, which includes in sequence from the object side to the image side: a first lens 1 with positive refractive power, the first lens 1 A lens 1 is a meniscus spherical lens whose front surface and rear surface are all convex to the object side; a second lens 2 with negative refractive power, and the second lens 2 is that the front surface is convex to the image side and the rear surface is convex to the image side. A double-concave spherical lens on the object side; a third lens 3 with positive refractive power, the third lens 3 is a double-convex spherical lens whose front surface is convex to the object side and the rear surface is convex to the image side; the second lens 2 And the third lens 3 is cemented into a cemented lens; the fourth lens 4 with negative power, the fourth lens 4 is a double-c...

example 2

[0078] Figure 8 It is the layout of Example 2 of the present disclosure, which is a focus reduction and enhancement mirror with a focal length of 70.99mm and a magnification of 0.71x, which includes in sequence from the object side to the image side: a first lens 1 with positive refractive power, the first A lens 1 is a meniscus spherical lens whose front surface and rear surface are all convex to the object side; a second lens 2 with negative refractive power, and the second lens 2 is that the front surface is convex to the image side and the rear surface is convex to the image side. A double-concave spherical lens on the object side; a third lens 3 with positive refractive power, the third lens 3 is a double-convex spherical lens whose front surface is convex to the object side and the rear surface is convex to the image side; the second lens 2 And the third lens 3 is cemented into a cemented lens; the fourth lens 4 with negative power, the fourth lens 4 is a double-concave...

example 3

[0090] Figure 15It is the layout of Example 3 of the present disclosure, which is a focus reduction and enhancement mirror with a focal length of 85.65mm and a magnification of 0.71x, which includes in sequence from the object side to the image side: a first lens 1 with positive refractive power, the first A lens 1 is a meniscus spherical lens whose front surface and rear surface are all convex to the object side; a second lens 2 with negative refractive power, and the second lens 2 is that the front surface is convex to the image side and the rear surface is convex to the image side. A double-concave spherical lens on the object side; a third lens 3 with positive refractive power, the third lens 3 is a double-convex spherical lens whose front surface is convex to the object side and the rear surface is convex to the image side; the second lens 2 And the third lens 3 is cemented into a cemented lens; the fourth lens 4 with negative power, the fourth lens 4 is a double-concave...

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Abstract

The invention relates to a focus-reducing and light-increasing additional mirror for use with an objective lens. From an object side to an image side, the system sequentially comprises a first lens having positive focal power, a second lens having negative focal power, a third lens having positive focal power, a fourth lens having negative focal power, and a fifth lens having positive focal power,wherein the second lens and the third lens are glued into a cemented lens, and the third lens, the fourth lens and the fifth lens at least comprise two abnormal dispersion lenses. The structure is more compact, a cemented lens and at least more than two abnormal dispersion lenses are used to inhibit secondary chromatic aberration increase caused by installation of the focus-reducing and light-increasing additional lens. Meanwhile, the distance between the objective lens and the focus-reducing and light-enhancing additional lens is increased, so that the number of the objective lenses which can be adapted to use is increased, the focal length of the objective lenses can be shortened, the focal ratio can be reduced, and a small-format camera can have a large-format view field and a relatively large working distance.

Description

technical field [0001] The invention relates to the technical field of focal reduction and enhancement lenses, in particular to an optical focal reduction and enhancement mirror. The focal length of the objective lens can be shortened and the focal ratio can be reduced, and at the same time, the small-format camera can have a large-format field of view and a relatively large working distance. Background technique [0002] An optical accessory called a reducer for shortening the focal length of an objective lens is described in US pre-grant publication number US2013 / 0064532. The accessory described in US2013 / 0064532 contains four lens elements, in order from the object side to the image side: a first lens element with a first negative power and a concave surface on the object side; a first lens element with a first positive power and a curvature of A second lens element with an object-side surface of CvOb2; a third lens element having a second negative power greater than the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B13/00G02B15/10
CPCG02B13/00G02B15/10G02B13/0045G02B9/60G02B27/0025H04N23/55
Inventor 黄木基
Owner SHENZHEN JYC TECH