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Coherent light waveguide illumination system with speckle noise reducer

A lighting system, a technology of coherent light, applied in the direction of the light guide of the lighting system, the light guide doped with a fluorescent agent, the light guide, etc., can solve the problem of being unsuitable for some applications, etc.

Active Publication Date: 2016-07-13
L E S S
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Other solutions involving decorrelation of coherent light sources may not be suitable for some applications

Method used

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  • Coherent light waveguide illumination system with speckle noise reducer
  • Coherent light waveguide illumination system with speckle noise reducer
  • Coherent light waveguide illumination system with speckle noise reducer

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Embodiment Construction

[0023] Several embodiments of the present invention will now be explained with reference to the drawings. Whenever the shapes, relative positions, and other aspects of the components described in the embodiments are not clearly limited, the scope of the present invention is not limited only to the components shown, but is for illustrative purposes only. Moreover, although many details are set forth, it should be understood that some embodiments of the present invention may be practiced without these details. In other instances, well-known circuits, structures, and techniques have not been shown in detail so as not to obscure the understanding of this description.

[0024] 3A, 3B, 4A, 4B, 5A, 5B, 6A, and 6B, to illustrate several embodiments of the lighting device, each of which uses a coherent light source coupled with a waveguide having a core 100 and a cladding 101, thereby The main light 105 is generated, which propagates along the waveguide until it is coupled out by the fir...

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PUM

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Abstract

A waveguide in which coherent light is to propagate along its longitudinal axis has formed therein a first scattering zone (103) that runs along the longitudinal axis and that is to scatter the propagating coherent light (105) out of the waveguide at a non-zero angle relative to the longitudinal axis. Means for vibrating a light spot of the coherent light relative to the waveguide, or means for dynamically changing a focus of the light spot, is provided, so that light coupling of the coherent light into the waveguide changes over time thereby generating different speckle patterns in the waveguide that overlap with the first scattering zone. Other embodiments are also described and claimed including one where a functional or diffusing coating (102) is provided that in combination with the first scattering zone yields a reduced speckle pattern.

Description

[0001] This non-provisional application claims the priority of the earlier filing date of the U.S. Provisional Application No. 61 / 846,183 entitled "CoherentLightWaveguideIlluminationSystemwithIntegratedSpeckleNoiseReducer" filed on July 15, 2013. Technical field [0002] The embodiment of the present invention relates to a lighting device that exhibits a reduced degree of coherence and thus a low speckle noise contrast. Other embodiments are also described. Background technique [0003] It is known that the illuminating coherent light on the illuminated surface generates a flickering illumination pattern also called speckle. For example, such as figure 1 As illustrated in, the speckle pattern results from the local interference generated between the incident wavefront from the coherent light source and the scattered wavefront from the illuminated surface. More specifically, the speckle pattern can originate from the superposition of random discrete wavefronts resulting from cont...

Claims

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Application Information

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IPC IPC(8): F21V8/00
CPCG02B6/0041G02B6/0076G02B6/0003G02B6/001G02B27/48
Inventor Y·蒂索
Owner L E S S