Optical system and projection device

An optical system and relationship technology, applied in optics, projection devices, optical components, etc., can solve the problem of increasing the size of the projection device, and achieve the effects of small size, easy portability and use, and fewer lenses.

Active Publication Date: 2022-02-15
GOERTEK OPTICAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, in order to improve the imaging quality of the projection device, the mirror group in the projection device usually needs to be used in combination with a large number of lenses, resulting in an increase in the size of the projection device

Method used

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  • Optical system and projection device
  • Optical system and projection device
  • Optical system and projection device

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Embodiment Construction

[0028] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0029] It should be noted that if there is a directional indication (such as up, down, left, right, front, back...) in the embodiment of the present invention, the directional indication is only used to explain the position in a certain posture (as shown in the accompanying drawing). If the specific posture changes, the directional indication will also change accordingly.

[0030] In addition, if there are descriptions involving "first", "second" and ...

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Abstract

The invention discloses an optical system and a projection device, and the optical system sequentially comprises an image source, a sixth lens, a fifth lens, a fourth lens, a third lens, a second lens and a first lens in the light transmission direction. The first lens, the second lens and the third lens form a first lens group, and the fourth lens, the fifth lens and the sixth lens form a second lens group; the first lens group has negative focal power, and the second lens group has positive focal power. According to the technical scheme, the optical system is small in size.

Description

technical field [0001] The invention relates to the technical field of projection imaging, in particular to an optical system and a projection device. Background technique [0002] With the development of technology and the improvement of people's living standards, projection devices have become more and more mature, and home theater projectors have become one of the media for people to pursue high-quality life. Among them, DLP (Digital Light Processing) technology achieves the effect of reflecting light at different angles by controlling the inversion and tilt of multiple micro-mirror elements in DMD (Digital Micromirror Device). The angle of the micro-mirror element in the DMD is divided into two states of "on" and "off". In the "on" state, the reflected light is imaged on the projection screen through the optical system, and in the "off" state, the light is absorbed by the absorber. The "on" and "off" states change rapidly alternately to achieve various gray levels of th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B13/18G02B13/22G03B21/14
CPCG02B13/18G02B13/22G03B21/14
Inventor 程发超宁静王中亮郭恒琳
Owner GOERTEK OPTICAL TECH CO LTD
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