Telecentric projection lens and image output device

A projection lens and telecentric technology, applied in the field of projection lenses, can solve the problems of high production cost, poor projection effect, large projection lens size, etc., and achieve the effect of loose assembly tolerance, good contrast, and small lens size

Active Publication Date: 2021-09-21
深圳小象光显有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The object of the present invention is to provide a telecentric projection lens and an image output device to solve the problems of large size of projection lens, poor projection effect and high cost of mass production in view of the deficiencies in the prior art above.

Method used

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  • Telecentric projection lens and image output device
  • Telecentric projection lens and image output device
  • Telecentric projection lens and image output device

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Embodiment Construction

[0030] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. The components of the embodiments of the invention generally described and illustrated in the figures herein may be arranged and designed in a variety of different configurations.

[0031] Accordingly, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art wi...

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Abstract

The invention provides a telecentric projection lens and an image output device, which relate to the field of projection lenses. The telecentric projection lens comprises: a first lens group, a second lens group, a third lens group and a prism, wherein the first lens group is close to the object plane, the third lens group is close to the image plane, and the second lens The group is arranged between the first lens group and the third lens group, and the prism is arranged between the third lens group and the image plane. Optical axes of the first lens group, the second lens group and the third lens group overlap. The first lens group has a negative diopter, the second lens group has a positive diopter, and the third lens group has a positive diopter, wherein the first lens group, the second lens group, and the third lens Groups form a telecentric structure. The short focal length of the projection lens, the small size of the lens, and the compact structure are realized, and the image quality is improved at the same time, and the cost of mass production is reduced.

Description

technical field [0001] The invention relates to the technical field of projection lenses, in particular to a telecentric projection lens and an image output device. Background technique [0002] Projectors are used more and more widely in teaching, life, and work. The projection quality of a projector is a key factor in judging the pros and cons of a projector. The projection lens is the last part of the optical path of a projector. The quality of the projection lens determines the quality of projection. , Improving the quality of the projection lens can directly improve the projection quality of the projector. [0003] During the development of projection lens towards micro-projection, the requirements for projection lens are getting higher and higher. The lens structure in the prior art is loose, the lens size is large, and the resolution is not good, the brightness is insufficient, and the mass production cost is high, which can no longer meet the requirements. Now there...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B13/00G02B13/22G02B13/24G03B21/14
CPCG02B13/0045G02B13/006G02B13/22G02B13/24G03B21/142
Inventor 刘海朋
Owner 深圳小象光显有限公司
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