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Ultra-short focal projection lens

A technology of projection lens and ultra-short focus, which is applied in the field of projection optical system, and can solve the problems of affecting projection effect, unstable precision, melting of glue, etc.

Pending Publication Date: 2018-03-20
SHANGHAI NOVA OPTICS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to correct aberrations, the existing design generally includes at least one aspherical lens and a doublet lens, which leads to problems such as complex processing and assembly, and unstable precision. Moreover, the high temperature of the cemented lens may cause partial melting of the glue, which affects projection. Effect

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] figure 1 It is a schematic structural diagram of an ultra-short-focus projection lens provided in Embodiment 1 of the present invention. The ultra-short-focus projection lens includes: a display chip 100, which is used to display the object surface to be projected; a refracting lens group 200 arranged on the light-emitting side of the display chip 100, and the refracting lens group 200 includes a plurality of lenses, each of which is a spherical lens. In order to balance the aberration formed by the projection object plane light passing through the refracting lens 200 group; the reflector 300 is located on the side of the refracting lens group 200 away from the display chip 100, and is used to reduce field curvature and distortion caused by the refracting lens group 200 and reflect the light , forming an enlarged projection image plane.

[0033] It can be understood that aberration is a phenomenon that deviates from the ideal imaging of paraxial light caused by non-par...

Embodiment 2

[0046] figure 2 The schematic structural diagram of the ultra-short-focus projection lens provided in Embodiment 2 of the present invention. This embodiment is a specific example based on Embodiment 1. See figure 2 , the ultra-short-focus projection lens provided in this embodiment includes a display chip 100, a refracting lens group 200, and a mirror 300, wherein the display chip 100 can be a 0.65-inch digital micromirror device with a resolution of 4096×2160 for providing high-definition projection Object surface; refracting lens group 200 comprises fifteen spherical lenses, and the fifteen spherical lenses are coaxially arranged, including the first lens 201, the second lens 202, the third lens 203, the fourth lens 204, the first lens arranged in sequence along the optical path Fifth lens 205, sixth lens 206, seventh lens 207, eighth lens 208, ninth lens 209, tenth lens 210, eleventh lens 211, twelfth lens 212, thirteenth lens 213, fourteenth lens Lens 214 and the fiftee...

Embodiment 3

[0069] Figure 5 The schematic structural diagram of the ultra-short-focus projection lens provided by the third embodiment of the present invention, this embodiment is another specific example based on the first embodiment, see Figure 5 , the ultra-short-focus projection lens provided in this embodiment includes a display chip 100, a refracting lens group 200, and a mirror 300, wherein the display chip 100 can be a 0.47-inch digital micromirror device with a resolution of 4096×2160 for providing high-definition projection Object surface; refracting lens group 200 comprises fifteen spherical lenses, and the fifteen spherical lenses are coaxially arranged, including the first lens 201, the second lens 202, the third lens 203, the fourth lens 204, the first lens arranged in sequence along the optical path Fifth lens 205, sixth lens 206, seventh lens 207, eighth lens 208, ninth lens 209, tenth lens 210, eleventh lens 211, twelfth lens 212, thirteenth lens 213, fourteenth lens L...

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Abstract

The invention discloses an ultra-short focus projection lens. The ultra-short-focus projection lens comprises a display chip which is used for displaying a to-be-projected object surface, a refractivelens group which is arranged on the light-emitting side of the display chip, and a mirror. The refractive lens group comprises a number of lenses. Each lens is a spherical lens and is used for balancing the aberration of the projection object surface light passing through the refractive lens group. The mirror is located on one side, which is away from the display chip, of the refractive lens group. The mirror is used to reduce field curvature and distortion, which are caused by the refractive lens group, and reflect light to form an enlarged projection image surface. According to the technical scheme of the invention, a number of spherical lenses work together to balance the aberration of the projection object surface light passing through the refractive lens group; field curvature and distortion are reduced through the mirror; the mirror reflects light to form the enlarged projection image surface; a short distance and high quality projection large image is realized; and in addition,all of the refractive lens groups are spherical lenses without aspherical lenses and double cemented lenses, which is beneficial to processing and mass production.

Description

technical field [0001] Embodiments of the present invention relate to projection optical system technology, and in particular to an ultra-short-focus projection lens. Background technique [0002] In recent years, ultra-short-throw projection lenses have attracted more and more attention in the short-throw projection market. On the one hand, the ultra-short-focus projection lens greatly shortens the projection distance compared with ordinary projection lenses, and can project a large field of view within a very short projection distance, which improves space utilization and avoids shadows or other objects; On the other hand, the design of an ultra-short-throw projection lens has high requirements for resolution, light intensity, and optimization of various aberrations. [0003] The lenses of ultra-short-throw projectors currently on the market include three types: reflection, refraction, and hybrid. Since the main component of projection lens imaging is the refraction lens...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B13/00G03B21/28G03B21/00
CPCG02B13/005G03B21/008G03B21/28
Inventor 杨军
Owner SHANGHAI NOVA OPTICS TECH