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laser projector laser light source

A technology of laser projectors and laser light sources, which is applied in optics, optical components, instruments, etc., can solve the problems of being unsuitable for civilian use, and achieve the effects of wide bandwidth, good randomness, and reduced time coherence

Active Publication Date: 2020-11-17
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In order to solve the problem that the existing laser projectors are suitable for engineering projects but not suitable for civilian use, the present invention provides a laser light source for laser projectors

Method used

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Embodiment 1

[0018] In this embodiment, the preferred scheme is adopted: as figure 1 As shown, several groups of laser emitting components include a group of blue laser diode arrays 5, a group of red laser diode arrays 6 and a group of green laser diode arrays 7, and each group of laser diode arrays corresponds to a group of speckle suppression devices; The distance between the lens 1 and the aperture 2 is the focal length of the converging lens 1; the distance between the aperture 2 and the collimating lens 3 is the focal length of the collimating lens 3; the converging lens 1 is a high-curvature uniform converging lens, and the focal length The aperture of aperture 2 is 2mm; the focal length of collimating lens 3 is 1.5mm; the reflectivity of transflective mirror 4 is 20%, and collimating lens 3 and transflective mirror 4 are closely fixed; The part is a dichroic prism.

[0019] The specific operation of this embodiment is as follows: blue laser diode array 5, red laser diode array 6, a...

Embodiment 2

[0021] In this embodiment, the preferred scheme is adopted: as figure 2 As shown, several groups of laser emitting components include a group of blue laser diode arrays 5, a group of red laser diode arrays 6 and a group of green laser diode arrays 7, and each group of laser diode arrays corresponds to a group of speckle suppression devices; the aperture 2 Adopt multimode optical fiber to replace; The distance between described converging lens 1 and multimode optical fiber is the focal length of converging lens 1; The distance between described multimode optical fiber and collimating lens 3 is the focal length of collimating lens 3; Lens 1 is a high-curvature uniform converging lens with a focal length of 7 mm; the aperture of the multimode optical fiber is 1.6 mm; the focal length of collimating lens 3 is 0.9 mm; the reflectivity of transflective mirror 4 is 40%, and the collimating lens 3 The distance from the mirror 4 is set to 10mm; the color combination components are two...

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Abstract

The invention discloses a laser light source of a laser projector. The laser light source comprises a plurality of laser emitting assemblies, a plurality of speckle suppression devices, a laser outputpart and a projection unit, wherein each laser emitting assembly consists of same-color laser diode arrays; each laser emitting assembly is provided with one speckle suppression device along respective optical path, and the laser output part and the projection unit are located behind the speckle suppression devices sequentially; each speckle suppression device comprises a converging lens, a diaphragm, a collimating lens and a transflective mirror which are arranged in sequence along the optical path, after laser reaches the transflective mirror, reflected light of the transflective mirror returns the converged laser to the corresponding laser diode in the laser emitting assemblies to form feedback, meanwhile, light of other laser diodes in the laser emitting assemblies also enters the laser diode to form multi-light injection, chaos is produced, and transmitted light of the transflective mirror is directly output as a low-coherence light source to the laser output part.

Description

technical field [0001] The invention relates to the field of laser light sources, in particular to a laser light source for a laser projector. Background technique [0002] With its high power, long life, and high degree of color reproduction, the three-color laser has attracted more and more attention, and has become the preferred light source for the next generation of projection display. At present, the laser projector uses a red, green and blue laser semiconductor (LD) array, which enters the projection unit through an optical fiber or a coupling lens system to form a laser projection system. Due to its good coherence, the semiconductor laser will have strong speckle phenomenon on the projection screen, so it cannot be directly used as a projection light source. The current measures are to use elements such as phase plates or scattering plates to disturb its polarization state and phase, and reduce its coherence. These measures can only reduce the granularity and thickn...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G03B21/20G02B27/48
CPCG02B27/48G03B21/2013G03B21/2033G03B21/206
Inventor 郭园园赵彤王安帮吴梅李青天
Owner TAIYUAN UNIV OF TECH
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