Optics: image projectors – Prism in light path
Reexamination Certificate
2007-05-01
2007-05-01
Lee, Diane (Department: 2851)
Optics: image projectors
Prism in light path
Reexamination Certificate
active
10951784
ABSTRACT:
The enclosed embodiments provide a light source unit and a projector with high light utilization efficiency. The unit has a light emitting part for emitting light from a planer emitting region, a reflecting metal electrode provided on one side of the light emitting part, a square pyramid prism on the other side of the light emitting part, and a bottom surface of the prism that has substantially the same size and shape as the planer emitting region. The inclined surfaces of the square pyramid prism output light that has entered the square pyramid prism from the bottom surface in a specific direction. The reflecting metal electrode reflects the light that has been reflected by the inclined surfaces and transmitted through the bottom surface of the square pyramid prism.
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Tsunemasa Taguchi, “Technologies for High-Intensity, High-Efficiency, and Long-Life White LED Illumination System,” Technical Information Institute Co., Ltd. (English translation, pp. 1-8).
Do Robert
Lee Diane
Seiko Epson Corporation
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