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US 2002/0171807 A1Published application
Light source device and projection television
AssigneeMitsubishi Denki Kabushiki Kaisha
InventorsTaketoshi Hibi, Akihisa Miyata
Life of this patent
Estimating the term…
Abstract
A projection television has a unit for reflecting OFF light not advancing toward a screen of light emitted by a reflection type light modulating element and a unit for controlling the amount of the reflecting OFF light and returns the OFF light which has not been used in a conventional device to the light source to reuse the OFF light. This configuration increases the utilization efficiency of the light and, as a result, can realize a powerful projection television having a bright projection image.
Claims14
An optical source device comprising:
- a lamp;
- a beam shaping optical system including a light uniforming element for uniforming a light intensity distribution in a plane perpendicular to the direction of propagation of the received emitting light of the lamp:
- an optical deflector for changeably reflecting the received emitting light of the beam shaping optical system in either one of two directions;
- and
- an optical reflector for reflecting light reflected in said one of two directions, along an axis of said one of two directions.
2 more elements
A light source device comprising:
- a lamp for emitting white light;
- a beam shaping optical system including a light uniforming element for receiving the emitting light of the lamp and uniforming the intensity distribution of the emitting light in a plane perpendicular to the direction of propagation of the emitting light of the lamp;
- a color separating element for separating the emitting light of the beam shaping optical system into a plurality of colors;
- optical deflectors provided for a plurality of colors to changeably reflect the emitting light of the color separating element in either one of two directions, respectively;
- and
- optical reflectors provided for the respective optical deflectors to reflect the light reflected in said one of two directions, along an axis of said one of two directions.
3 more elements
Dependencies are inferred from the claim text.