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Projection lens and projection system

A technology of projection lens and reflection system, which is applied in the field of projection display, can solve the problems of large field of view, short projection distance, and difficult design, and achieve the effect of avoiding being blocked and saving the use of space

Pending Publication Date: 2022-04-08
QINGDAO HISENSE LASER DISPLAY CO LTD
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Problems solved by technology

Due to the short projection distance, the ultra-short-focus lens requires a large field of view and high imaging requirements. At the same time, it must also take into account cost and miniaturization, which makes the design more difficult.
[0003] With the popularity and use of three-color laser light sources, the projection wavelength has been extended from the original 620nm to 645nm, so projection lenses designed based on wavelengths within 620nm are no longer applicable, and there is a problem of color shift in image imaging

Method used

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  • Projection lens and projection system
  • Projection lens and projection system
  • Projection lens and projection system

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Embodiment Construction

[0038] In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention will be further described below in conjunction with the accompanying drawings and embodiments. Example embodiments may, however, be embodied in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The same reference numerals denote the same or similar structures in the drawings, and thus their repeated descriptions will be omitted. The words expressing position and direction described in the present invention are all described by taking the accompanying drawings as an example, but changes can also be made according to needs, and all changes are included in the protection scope of the present invention. The drawings of the present inv...

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Abstract

The invention discloses a projection lens and a projection system, the projection lens comprises a refraction system and a reflection system, the refraction system comprises a front lens group, a middle lens group and a rear lens group, and the rear lens group comprises two doublet lens groups and a triplet lens group; the reflecting system comprises a reflecting mirror, the reflecting mirror comprises a first surface close to the front lens group and a second surface away from the front lens group, and the second surface is used for reflecting the imaging light of the refraction system. Two doublet lens groups and one triplet lens group are adopted to improve the chromatic aberration generated by different wavelengths, so that the spectrum of the projection lens can cover the range of 450-645 nm. The second surface of the reflector is adopted to reflect imaging light, so that the first surface and the second surface both participate in secondary imaging, the degree of freedom of the two surfaces is utilized to the greatest extent, the design difficulty of the two surfaces can be reduced, and the manufacturability of the reflection system is improved.

Description

technical field [0001] The invention relates to the technical field of projection display, in particular to a projection lens and a projection system. Background technique [0002] With the continuous development of projection technology, projection display products have entered thousands of households as large-screen products replacing TVs. As a display product that replaces a TV, in order to avoid objects blocking the projection lens from affecting the display effect, or to design an all-in-one structure, current home projection equipment is usually equipped with an ultra-short-focus lens. Due to the short projection distance, the ultra-short-focus lens requires a large field of view and high imaging requirements. At the same time, it also needs to take into account cost and miniaturization, which makes the design more difficult. [0003] With the popularity and use of three-color laser light sources, the projection wavelength has been extended from the original 620nm to ...

Claims

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Application Information

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IPC IPC(8): G02B13/00G02B13/18G02B17/08G03B21/14
Inventor 阴亮
Owner QINGDAO HISENSE LASER DISPLAY CO LTD
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