OPTICAL MEMS SCANNING MICRO-MIRROR WITH SPECKLE REDUCTION
First Claim
Patent Images
1. Optical MEMS scanning micro-mirror comprising:
- a movable scanning micro-mirror, being pivotally connected to a MEMS body substantially surrounding the lateral sides of the micro-mirror, and provided with neutral axis N-N corresponding to a non pivoted position of said micro-mirror,a transparent prism substantially covering the reflection side of the micro-mirror; and
wherein said prism has an outer face and an inner face, wherein said outer face is not parallel to said inner face, and wherein the prism is arranged such that, light incident on the movable scanning micro-mirror can pass through the prism so as to provide an anti-reflection effect and light reflected by the movable scanning micro-mirror can pass through the prism to provide an anti-speckle effect.
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Abstract
Optical MEMS scanning micro-mirror comprising:—a movable scanning micro-mirror (101) pivotally connected to a MEMS body (102) substantially surrounding the lateral sides of the micro-mirror;—an transparent prism (500, 600) substantially covering the reflection side of the micro-mirror;—wherein said prism has its outer face non-parallel to the micro-mirror neutral plane N-N, thereby providing a dual anti-speckle and anti-reflection effect, namely against parasitic light. The invention also provides the corresponding micro-projection system and method for reducing speckle.
19 Citations
15 Claims
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1. Optical MEMS scanning micro-mirror comprising:
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a movable scanning micro-mirror, being pivotally connected to a MEMS body substantially surrounding the lateral sides of the micro-mirror, and provided with neutral axis N-N corresponding to a non pivoted position of said micro-mirror, a transparent prism substantially covering the reflection side of the micro-mirror; and wherein said prism has an outer face and an inner face, wherein said outer face is not parallel to said inner face, and wherein the prism is arranged such that, light incident on the movable scanning micro-mirror can pass through the prism so as to provide an anti-reflection effect and light reflected by the movable scanning micro-mirror can pass through the prism to provide an anti-speckle effect. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A method for reducing speckle in a micro-projection system adapted for projecting light on a projection surface, comprising:
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providing a light with at least one coherent light source; directing light from the light source to the projection surface; providing a scanning micro-mirror for deviating light from said light source so as to scan a projected image onto said projecting surface said micro-mirror being provided with neutral axis N-N corresponding to a non pivoted position of said micro-mirror; and covering the reflection side of the micro-mirror with a transparent prism, wherein said prism has an outer face and an inner face, wherein said outer face is not parallel to said inner face, and arranging the prism such that, light incident on the movable scanning micro-mirror can pass through the prism so as to provide an anti-reflection effect and light reflected by the movable scanning micro-mirror can pass through the prism to provide an anti-speckle effect.
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Specification