Optical system unit and projector having two-planed light absorbing plate
AssigneeCasio Computer Co., Ltd.
InventorsOsamu Umamine, Masanori Ohta
Life of this patent
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Abstract
An optical system unit of a projector of the invention includes an illumination side block, an image producing block and a projection side block, the image producing block, in which a DMD display device is fixed which reflects rays of “off” state light to the outside of an entrance opening of a projection side optical system, has a resin accommodation case and a metallic light absorbing portion which is disposed on an inner surface of the accommodation case, an inner surface of the light absorbing portion has heat resisting properties and light absorbing properties, and the accommodation case has in an upper surface thereof a cooling opening for preventing the overheating of the resin which forms the accommodation case.
Claims8
An optical system unit in which light from a light source is shone on to a display device and rays of “on” state light, produced when the light shone on to the display device is reflected thereby, are projected while being enlarged by a projection side optical system, the optical system unit comprising:
- an image producing block in which the display device is disposed so as to reflect rays of “off” state light to an outside of a light entrance opening of the projection side optical system;
- an illumination side block which incorporates therein an integrator rod;
- and
- a projection side block which incorporates therein the projection side optical system,
- wherein the image producing block has a resin accommodation case and a metallic light absorbing plate which is disposed on an inner surface of the accommodation case,
- wherein a surface having heat-resisting properties and light-absorbing properties is formed on an inner surface of the light absorbing plate,
- wherein the accommodation case has a cooling opening in an upper surface thereof,
- wherein the image producing block is connected to at least the illumination side block and the projection side block, and
- wherein the light absorbing plate has two planes of an upper surface portion and a front surface portion, which are both formed into a flat plate shape, so as to be formed into an L-shape in section, the front surface portion including a through hole and being made to contact an inner surface of a portion of the accommodation case where the accommodation case connects to the projection side block, and the upper surface portion being made to internally contact an upper surface of the accommodation case.
A projector comprising:
- a control unit;
- a light source unit;
- and
- an optical system unit including various types of optical systems, the optical system unit being such that light from the light source unit is shone on to a display device and rays of “on” state light, produced when the light shone on to the display device is reflected thereby, are projected while being enlarged by a projection side optical system,
- wherein the optical system unit comprises:
- an image producing block in which the display device is disposed so as to reflect rays of “off” state light to an outside of a light entrance opening of the projection side optical system;
- an illumination side block which incorporates therein an integrator rod;
- and
- a projection side block which incorporates therein the projection side optical system,
- wherein the image producing block has a resin accommodation case and a metallic light absorbing plate which is disposed on an inner surface of the accommodation case,
- wherein a surface having heat-resisting properties and light-absorbing properties is formed on an inner surface of the light absorbing plate,
- wherein the accommodation case has a cooling opening in an upper surface thereof,
- wherein the image producing block is connected to at least the illumination side block and the projection side block, and
- wherein the light absorbing plate has two planes of an upper surface portion and a front surface portion, which are both formed into a flat plate shape, so as to be formed into an L-shape in section, the front surface portion including a through hole and being made to contact an inner surface of a portion of the accommodation case where the accommodation case connects to the projection side block.
Dependencies are inferred from the claim text.