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Projection device

A technology for projection devices and generating devices, which is applied in projection devices, optics, instruments, etc., can solve the problems that the weight and volume of short-focus projection lenses cannot be reduced, and cannot meet the needs of portability and light weight, and achieve small size and high optical performance. Effect

Pending Publication Date: 2021-01-05
王志煌
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, short-throw projection devices usually use a large number of lenses to achieve short focus while having high optical performance. However, a large number of lenses will cause the problem that the weight and volume of the short-throw projection lens cannot be reduced, and thus cannot meet public expectations. Portable and lightweight requirements

Method used

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Embodiment Construction

[0016] In order to illustrate the present invention more clearly, a number of preferred embodiments are given and detailed descriptions are as follows in conjunction with the accompanying drawings. Please refer to Figure 1 to Figure 3 As shown, it is the projection device 100 of the first preferred embodiment of the present invention. The projection device 100 is used to receive an image light beam P generated by an image light source generating device 10 and project it in the direction of an imaging surface M, and place it on the imaging surface M forms a projection image, and the projection device 100 includes a relay optical system 20 and a reflective optical system 40 arranged along the optical axis.

[0017] The relay optical system 20 is used to receive the image beam P and pass through the image beam P. The relay optical system 20 is mainly composed of a plurality of lenses. For example, in this embodiment, the relay optical system 20 includes 9 lenses, including lens...

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PUM

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Abstract

A projection device comprises a relay optical system and a reflection optical system which are arranged along an optical axis. The reflection optical system comprises a reflection element and at leastone lens. The at least one lens is located between the reflection element and the relay optical system and is provided with a first optical surface and a second optical surface which are opposite toeach other, the second optical surface faces the relay optical system, and after an image light beam passes through the relay optical system, the image light beam enters the at least one lens from thesecond optical surface and is reflected by the at least one lens, enters a reflecting surface of the reflectinon element from the first optical surface, passes through the at least one lens after being reflected by the reflecting surface, leaves the at least one lens from the second optical surface and then is projected towards the imaging surface, and effective paths of the reflection element and the at least one lens are positioned on the same side of the optical axis.

Description

technical field [0001] The present invention relates to a projection device; in particular, it refers to a projection device. Background technique [0002] With the advancement of video technology, projection equipment suitable for general family space and work meetings is becoming more and more popular. The projection lens used to clearly present images on the screen is an important core component of projection equipment. [0003] With the advancement of technology, in order to cope with the limitation of the use of space, some manufacturers further manufacture short-focus projection equipment, so that the short-focus projection equipment can achieve a clear projection effect in a limited space. However, short-focus projection devices usually use a large number of lenses to achieve short focus and high optical performance at the same time. However, a large number of lenses will cause the problem that the weight and volume of the short-focus projection lens cannot be reduced...

Claims

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Application Information

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IPC IPC(8): G03B21/28G03B21/14
CPCG03B21/14G03B21/28
Inventor 王志煌
Owner 王志煌