Projection lens

A technology of projection lens and lens, which is applied in the field of projection lens, can solve the problems of large distortion, poor imaging quality, increase of total optical length of projection lens, etc., and achieve the effect of large numerical aperture and high imaging quality

Active Publication Date: 2018-03-30
ZHEJIANG SUNNY OPTICAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Increasing the number of lenses will increase the total optical length of the projection lens, which is not conducive to the miniaturization...

Method used

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Examples

Experimental program
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Embodiment 1

[0069] Refer to the following Figure 1 to Figure 2 A projection lens according to Embodiment 1 of the present application is described. figure 1 A schematic structural diagram of a projection lens according to Embodiment 1 of the present application is shown.

[0070] Such as figure 1 As shown, the projection lens according to the exemplary embodiment of the present application sequentially includes: a first lens E1 , a second lens E2 , a third lens E3 and a stop STO along the optical axis from the image source side to the imaging side.

[0071] The first lens E1 has positive refractive power, its image source side surface S1 is convex, and its imaging side surface S2 is concave; the second lens E2 has positive refractive power, its image source side surface S3 is concave, and its imaging side surface S4 is convex; The third lens E3 has positive refractive power, its image source side surface S5 is concave, and its imaging side surface S6 is convex. In the light wave band ...

Embodiment 2

[0096] Refer to the following Figure 3 to Figure 4 A projection lens according to Embodiment 2 of the present application is described. In this embodiment and the following embodiments, for the sake of brevity, descriptions similar to those in Embodiment 1 will be omitted. image 3 A schematic structural diagram of a projection lens according to Embodiment 2 of the present application is shown.

[0097] Such as image 3 As shown, the projection lens according to the exemplary embodiment of the present application sequentially includes: a first lens E1 , a second lens E2 , a third lens E3 and a stop STO along the optical axis from the image source side to the imaging side.

[0098] The first lens E1 has positive refractive power, its image source side surface S1 is concave, and the imaging side surface S2 is convex; the second lens E2 has negative refractive power, its image source side surface S3 is concave, and the imaging side surface S4 is convex ; The third lens E3 has...

Embodiment 3

[0110] Refer to the following Figure 5 to Figure 6 A projection lens according to Embodiment 3 of the present application is described. Figure 5 A schematic structural diagram of a projection lens according to Embodiment 3 of the present application is shown.

[0111] Such as Figure 5 As shown, the projection lens according to the exemplary embodiment of the present application sequentially includes: a first lens E1 , a second lens E2 , a third lens E3 and a stop STO along the optical axis from the image source side to the imaging side.

[0112] The first lens E1 has positive refractive power, its image source side surface S1 is convex, and the imaging side surface S2 is convex; the second lens E2 has negative refractive power, its image source side surface S3 is concave, and the imaging side surface S4 is convex ; The third lens E3 has a positive refractive power, its image source side surface S5 is convex, and its imaging side surface S6 is convex. In the light wave ba...

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Abstract

The invention discloses a projection lens which sequentially comprises a first lens, a second lens and a third lens from an image source side to an imaging side along an optical axis. The first lens has positive focal power or negative focal power, the second lens has positive focal power or negative focal power, the third lens has positive focal power, and the surface of the imaging side of the third lens is a convex surface. The distance TTL between the image source surface of the projection lens and the surface of the imaging side of the third lens on the optical axis and the total effective focal distance f of the projection lens meet the formula TTL/f<1.4, and the effective focal distance f3 of the third lens and the total effective focal distance f of the projection lens meet the formula 0<f3/f<18.0.

Description

technical field [0001] The present application relates to a projection lens, and more particularly, the present application relates to a projection lens including three lenses. Background technique [0002] In recent years, with the continuous advancement of science and technology, interactive devices have gradually emerged, and the application range of projection lenses has become wider and wider. Nowadays, chip technology and intelligent algorithms are developing rapidly. Using an optical projection lens to project an image to a space object and receiving the image signal, a three-dimensional image with position and depth information can be calculated. Three-dimensional images with depth information can be further used in the development of various depth applications such as biometrics. [0003] The traditional projection lens used for imaging usually eliminates various aberrations and improves resolution by increasing the number of lenses. Increasing the number of lense...

Claims

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Application Information

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IPC IPC(8): G03B21/14G02B13/00
Inventor 黄林王新权
Owner ZHEJIANG SUNNY OPTICAL CO LTD
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