Projection lens

A projection lens and lens technology, applied in the field of projection lenses, can solve the problems of large distortion, poor imaging quality, and inability to redistribute projection beams, etc., and achieve the effect of large numerical aperture and high imaging quality

Pending Publication Date: 2018-07-13
ZHEJIANG SUNNY OPTICAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Traditional projection lenses used for imaging eliminate various aberrations and improve resolution by increasing the number of lenses, but this will increase the total optical length (TTL) of the projection lens, which is not conducive to the miniaturization of the lens
In addition, traditional projection lenses with large field of view have large distortion and poor image quality, and cannot be matched with optical diffraction elements (DOE) to accurately redistribute the projection beam on the target object

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0074] Refer to the following Figure 1 to Figure 2B 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.

[0075] 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.

[0076] The first lens E1 has a positive refractive power, its near image source side S1 is a convex surface, and its near image source side S2 is a concave surface; the second lens E2 has a negative refractive power, its near image source side S3 is a concave surface, and its near image source side S4 is a concave surface ; The third lens E3 has a positive refractive power, its side near the image source S5 is concave, and its side near t...

Embodiment 2

[0105] Refer to the following Figure 3 to Figure 4B 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.

[0106] Such as image 3As 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.

[0107] The first lens E1 has a positive refractive power, its near image source side S1 is a convex surface, and its near imaging side S2 is a convex surface; the second lens E2 has a negative refractive power, its near image source side S3 is a concave surface, and its near image source side S4 is a con...

Embodiment 3

[0121] Refer to the following Figure 5 to Figure 6B 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.

[0122] 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.

[0123] The first lens E1 has a positive refractive power, its near image source side S1 is a convex surface, and its near imaging side S2 is a convex surface; the second lens E2 has a negative refractive power, its near image source side S3 is a concave surface, and its near image source side S4 is a concave surface ; The third lens E3 has a positive refractive power, its side near the image source S5 is concave, and its side near the i...

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Abstract

The invention discloses a projection lens which sequentially comprises a first lens, a second lens and a third lens along the optical axis from an image-source side to an imaging side. The first lenshas positive focal power, and the surface, which is close to the image-source side, of the first lens is a convex surface; the second lens has positive focal power or negative focal power; the third lens has positive focal power and is a meniscus lens, and the surface, which is close the imaging side, of the meniscus lens is a convex surface. The image-source height ImaH of the projection lens andthe total effective focal length f of the projection lens meet a conditional expression of ImgH / f 0.2.

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. Today, chip technology and intelligent algorithms are developing rapidly. Using optical projection lenses to project images to space objects and receiving the image signals, a three-dimensional image with object position and depth information can be calculated. The specific method is as follows: use the optical projection lens to project the light emitted by the infrared laser diode (LD) or the vertical cavity surface emitting laser (VCSEL) toward the target object; the projected beam is realized after passing through the optical diffraction element (DOE). The redistribution on t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B13/18G03B21/14
CPCG02B13/18G03B21/14G02B13/22G02B13/0035G02B13/16G03B21/147G02B27/4205G03B21/145
Inventor 王新权黄林
Owner ZHEJIANG SUNNY OPTICAL CO LTD
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