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Micro projector lighting path

A technology of micro projector and lighting light path, applied in optics, instruments, projection devices, etc., can solve the problems of increased cost, increased LED control cost and complexity, etc.

Pending Publication Date: 2019-06-04
杭州浩渺光电有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] figure 2 The projection output brightness of the four-channel projection illumination light path can be compared with figure 1 The above-mentioned three-channel method is about 15% higher, and the newly added LED chips and collimating lens groups will increase the cost and increase the cost and complexity of LED control

Method used

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  • Micro projector lighting path
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  • Micro projector lighting path

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Such as Figure 4 As shown, in this example, there are three color light sources of red, green and blue, three collimating lens groups, one relay lens, two dichroic mirrors, one fly eye lens and one reflector, and the red, green and blue light The sources are 101, 102, and 103 respectively. The light emitted by the red, green, and blue light sources passes through the collimating lens groups 201, 202, and 203, and then is synthesized by two dichroic mirrors 301, 302 to irradiate into the fly-eye lens 5.

[0025] In this embodiment, the property of the first dichroic mirror is that when the main light is incident at an angle of 45°, it can transmit blue and reflect red and green, that is, the dichroic mirror corresponds to the visible light irradiated along this direction, and the blue part of the visible light will pass through the dichroic mirror, and the green light and red light will be reflected by the dichroic mirror; the property of the second dichroic mirror is t...

Embodiment 2

[0029] Such as Figure 5 As shown, compared with Embodiment 1, this embodiment lies in that the location of the green light source 102 and the properties of the two dichroic mirrors 301 are different.

[0030] In this embodiment, the installation direction of the green light source is facing the fly-eye lens. The property of the first dichroic mirror 301 is that when the main light is incident at 45°, it reflects blue and passes through red and green. After passing through the dichroic mirror 301 , the blue light part will be reflected by the dichroic mirror 301 .

[0031] The green light and the blue light synthesize a bundle of blue-green light at the dichroic mirror 301, pass through the relay lens 4, and merge with the red light at 302 to form a bundle of light containing three colors of red, green and blue.

[0032] Among them, the blue light spectrum contained in the light emitted by the green light source is reflected at the first dichroic mirror 301, and is verticall...

Embodiment 3

[0034] Such as Figure 6 As shown, compared with Embodiment 1, this embodiment lies in that the installation positions of the red light source 101, the blue light source 103 and the reflector are different, and the properties of the two dichroic mirrors 301 and 302 are also different from those in Embodiment 1. .

[0035] In this embodiment, the reflector is installed facing the blue light source 103, and the property of the first dichroic mirror 301 is that when the main light is incident at 45 degrees, it transmits red and reverses blue and green, that is, the dichroic mirror corresponds to irradiating along this direction. Incoming visible light, the red light part in the visible light will pass through the dichroic mirror 301, while the green light and blue light part will be reflected by the dichroic mirror 301, and the property of the second dichroic mirror 302 is the main light When incident at 45 degrees, it reflects blue and transmits red and green, that is, the dich...

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Abstract

The invention relates to the field of micro projectors, so as to solve the technical problems of improving the light emitting amount of a green light source in a three-channel micro projector and increasing the whole output brightness of the projector. The technical scheme is to use the light emitting property of the green light source in the projector is that the blue light emitted by the light source chip excites specific phosphor on the surface of the chip to emit a large amount of green light, after the light emitted by the light source is collimated by a collimating lens group, a dichroicmirror is used to separate a blue light spectrum and a green light spectrum in the light, the blue light spectrum is returned in the original path by using a mirror and is then concentrated on the surface of the green light source to excite the phosphor, so that the green light source can emit more green light, and the whole brightness of the micro projector is further improved.

Description

technical field [0001] The invention relates to the field of miniature projectors. . Background technique [0002] With the development of science and technology, the portability of micro-projectors has gradually entered thousands of households, and with the upgrading of LED light sources, the brightness of micro-projectors has gradually increased, becoming a popular household consumer product. The illumination light path of a conventional three-channel micro-projector is as follows: figure 1 As shown, the light rays emitted by three light sources 101, 102, and 103 emitting red, green, and blue colors respectively pass through the collimating lens groups 201, 202, and 203, and the light rays of 102 and 103 pass through the first dichroic mirror 301 After the light is combined, it passes through the relay lens 4, and then synthesizes a beam of collimated light with the light emitted by 101 at the second dichroic mirror 302 and enters the fly-eye lens 5 for light mixing, the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03B21/20
Inventor 李彩萍其他发明人请求不公开姓名
Owner 杭州浩渺光电有限公司