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Optical lens being able to realize internal focusing function

A technology of optical lens and function, applied in the field of optical lens, can solve the problems of large manufacturing investment, etc., and achieve the effect of less lens quantity, convenient focusing and easy adjustment of focus

Pending Publication Date: 2018-05-08
鹤山市嘉米基光电科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The projection lens disclosed in the US patent US7742243B2 technology not only moves the entire lens group when focusing, but also uses multiple aspherical lenses in the lens, and the initial manufacturing investment is huge

Method used

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  • Optical lens being able to realize internal focusing function
  • Optical lens being able to realize internal focusing function
  • Optical lens being able to realize internal focusing function

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] like Figure 1~4 As shown in , 9, an optical lens capable of realizing internal focusing function, including a first lens group G1 fixed on the projection device close to the object side and having positive refractive power, used for moving to realize internal focusing and having positive refractive power The second lens group G2; the weight of the first lens group G1 is larger than the second lens group G2; the combined focal length of the first lens group G1 is f1, and the combined focal length of the second lens group G2 is f2 , and satisfy the following inequality: 0.07

[0035] Wherein, the first lens group G1 includes: a positive lens L1, a positive lens L2, a negative lens L3 and an aperture stop STO fixed behind the first lens group G1, the overall combined refractive power of the first lens group is positive; The lens group G2 includes: a positive lens L4.

[0036] The side of the positive lens L1 close to the object side is marked as S1, and the ...

Embodiment 2

[0045] like Figure 5-8 As shown in , 9, an optical lens capable of realizing internal focusing function, including a first lens group G1 fixed on the projection device close to the object side and having positive refractive power, used for moving to realize internal focusing and having positive refractive power The second lens group G2; the weight of the first lens group G1 is larger than the second lens group G2; the combined focal length of the first lens group G1 is f1, and the combined focal length of the second lens group G2 is f2 , and satisfy the following inequality: 0.07

[0046] Wherein, the first lens group G1 includes: a positive lens L1 , a positive lens L2 , a negative lens L3 and an aperture stop STO fixed behind the first lens group G1 . The overall combined refractive power of the first lens group is positive. The second lens group G2 includes: a positive lens L4 and a positive lens L5.

[0047] The side of the positive lens L1 close to the obje...

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Abstract

The invention discloses an optical lens being able to realize an internal focusing function. The optical lens includes a first battery of lens G1 which is fixed on a projection device, approaches theobject side and has positive focal power, and a second battery of lens G2 which is used for realizing internal focusing in a mobile manner and has positive focal power, wherein the weight ratio of thefirst battery of lens G1 is greater than the weight ratio of the second battery of lens G2; the combination focal length of the first battery of lens G1 is f1; the combination focal length of the second battery of lens G2 is f2; and the inequality 0.07<f2 / f1<0.85 is satisfied. The optical lens being able to realize an internal focusing function can realize internal focusing through the two batteries of lens, reasonably sets the focal power and the combination focal length of the two batteries of lens, and can realize internal stationary focusing when different object distance is used. Especially, through moving of the second battery of lens G2, internal focusing can be realized, and adjustment is easy and focusing is convenient. As the quantity of the lenses of the optical lens being ableto realize an internal focusing function is small, internal continuous imaging surface adjusting can be realized and the 1.3-1.4 stop number can be guaranteed and the product cost is low.

Description

technical field [0001] The invention relates to the technical field of projection, in particular to an optical lens capable of realizing an internal focusing function. Background technique [0002] With the advancement of science and technology, various projection technologies are constantly emerging, and the application occasions are becoming more and more extensive. For a fixed focal length projection system, if you need to change the size of the projection screen, you need to adjust the distance between the projection device and the projection screen to achieve the change in the size of the projection screen; when the distance between the projection device and the projection screen changes, you need to refocus. Adjust the sharpness of the picture. [0003] The traditional fixed focal length projection lens is adjusted by moving the entire lens group back and forth together, and changing the back focal length of the optical system to achieve focusing. The projection lens...

Claims

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Application Information

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IPC IPC(8): G02B13/16G02B13/22G02B7/04G03B21/14
CPCG02B7/04G02B13/16G02B13/22G03B21/142
Inventor 李唯宏
Owner 鹤山市嘉米基光电科技有限公司