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Optical system and projection lens capable of increasing field of view

An optical system and field of view technology, which is applied in the field of optical systems to increase the optical path, improve imaging quality, and reduce deformation.

Active Publication Date: 2020-08-18
深圳鹊巢停车科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the prior art, it is difficult to realize a projection lens that has a large field of view and can project high-quality images with less distortion

Method used

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  • Optical system and projection lens capable of increasing field of view
  • Optical system and projection lens capable of increasing field of view
  • Optical system and projection lens capable of increasing field of view

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Experimental program
Comparison scheme
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Embodiment Construction

[0048] The projection optical system and projection lens of the present invention will be described in detail below with reference to the drawings and embodiments.

[0049] see figure 1 , is a structural schematic diagram of the first embodiment of the optical system capable of increasing the viewing angle of the present invention.

[0050] An optical system capable of increasing the field of view is used to image a first image 100 entering the optical system into an enlarged second image. The optical system includes a lens group 101 and a concave mirror 105 .

[0051] Wherein, the lens group 101 includes several lenses arranged forward and backward along the optical path and having the same principal optical axis. The first image 100 forms a first intermediate image 103 and a second intermediate image 104 successively in the lens group 101 . The concave mirror 105 is located behind the lens group 101 and is used to reflect the second intermediate image 104 to form an enlarge...

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Abstract

The invention discloses an optical system with an increased field angle, and a projection lens. The optical system is used for amplifying a first image subjected to the optical system into a second image. The optical system comprises a lens assembly and a concave mirror. The lens assembly includes a plurality of lenses arranged front and back along an optical path and sharing the same main optical axis. The first image sequentially forms a first intermediate image and a second intermediate image in the lens assembly. The concave mirror is arranged at the back of the lens assembly and is used for reflecting the second intermediate image to form an amplified second image. The transmittance of the optical system is 0.2 to 0.25. The focal length of the optical system is -2.9 mm to -3.2 mm. The offset of the first image relative to the main optical axis is larger than 120%. According to the technical scheme of the invention, the field angle is increased and the imaging effect is improved. Meanwhile, the short-distance projection of a large image is realized.

Description

technical field [0001] The invention relates to the field of optical systems, in particular to an optical system and a projection lens capable of increasing the viewing angle. Background technique [0002] The ultra-short-throw projection lens can effectively shorten the projection distance of the projector, and is an important solution for projecting large-size images at short distances on the market. [0003] There are three ways to shorten the focal length of the projection lens: refraction, reflection and hybrid. Refractive design lenses are all composed of lenses, including spherical lenses or aspheric lenses. Because the lens of this design has a large number of lens lenses and various types, the structure is often complicated, which is not conducive to manufacturing. Reflective lenses are all composed of reflectors, including spherical or aspheric reflectors. The reflectors can be convex, concave or plane reflectors, but the processing and detection of aspheric refle...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B13/06G02B13/24G02B13/00G02B17/08G03B21/14
Inventor 刘美鸿母林纪超超
Owner 深圳鹊巢停车科技有限公司