Generation method and projection system of speckle-dissipating device based on irregular arrangement of microlenses

A technology of micro-lens and dispersing speckle, which is applied in the direction of instruments, optical components, projection devices, etc., can solve problems such as uncontrollability, unfavorable market development, hidden dangers of system stability, etc., and achieve the effect of high energy utilization

Active Publication Date: 2020-08-21
SICHUAN WINDOM PHOTOELECTRIC TECH
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Problems solved by technology

This scheme introduces dynamic components into the projection system, which not only brings serious hidden dangers to system stability, but also restricts the development of modern projectors towards lightweight and miniaturization.
[0006] In addition, foreign countries also use optical fiber technology to achieve laser decoherence, but its manufacturing cost is too high, which is extremely unfavorable for market-oriented development
[0007] The existing method of introducing a dynamic system into the optical path of a projector usually uses a rotating wheel to drive the frosted glass to dissipate the speckle. However, due to the uncontrollable spikes on the ground glass, the energy utilization rate of the system is low, and the divergence angle is uncontrollable.

Method used

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  • Generation method and projection system of speckle-dissipating device based on irregular arrangement of microlenses

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[0025] All features disclosed in this specification, or steps in all methods or processes disclosed, may be combined in any manner, except for mutually exclusive features and / or steps.

[0026] Any feature disclosed in this specification, unless specifically stated, can be replaced by other alternative features that are equivalent or have similar purposes. That is, unless expressly stated otherwise, each feature is one example only of a series of equivalent or similar features.

[0027] For the red, green and blue three-color lasers that are most commonly used in projector light sources, the present invention uses small-aperture microlenses (the type of microlenses are convex microlenses) as the basic unit, and arranges the microlenses irregularly and randomly, which can play To break the effect of laser coherence, the divergence angle of the beam can be controlled by controlling the numerical aperture of the microlens.

[0028] Such as figure 1 As shown, the speckle elimina...

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Abstract

The invention discloses a speckle-dispersing device based on microlens irregular arrangement, and a generating method thereof. The microlenses are convex microlenses. The speckle-dispersing device comprises microlens irregular arrangement formed on the surface of the speckle-dispersing device, and the microlens irregular arrangement comprises irregularly arranged microlenses, including microlenseswith different apertures. By adopting the speckle-dispersing device, a beam-divergence angle can be controlled through controlling a numerical aperture of the microlenses, the laser transmittance isgreater than 85%, and the energy utilization rate is high.

Description

technical field [0001] The invention relates to the technical field of laser display, in particular to a method for generating speckle-dissipating devices based on irregular arrangement of microlenses and a projection system. Background technique [0002] Traditional bulb-type projector light sources (such as ultra-high pressure mercury lamps, short-arc xenon lamps, and metal halide lamps, etc.) have a short service life (approximately 1500-2500 hours), and high replacement and maintenance costs in the later period severely limit the application of projectors. fields and applications. Although LED projectors can achieve long life, they are limited by the shortcomings of the LED's own brightness and efficiency that decrease sharply with temperature. The "brightness" of LED light source projectors has become the biggest limitation for the promotion and application of LED projectors! The brightness of traditional business projectors can easily reach more than 2000 lumens, and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B27/48G03B21/00G03B21/14G03B21/20
CPCG02B27/48G03B21/008G03B21/142G03B21/206
Inventor 董小春姜世平杨武代冬军
Owner SICHUAN WINDOM PHOTOELECTRIC TECH
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