Optical equipment
AssigneeHitachi, Ltd.
InventorsKenji Fuse, Mikio Shiraishi, Yasuo Otsuka, Nobuyuki Kaku, Hidehiro Ikeda
Life of this patent
Estimating the term…
Abstract
In optical equipment, such as a liquid crystal projector, a discharge lamp supplies light through a light valve device to project a light beam on a screen. A cooling system is provided to cool the light valve device, including a ventilation device, such as a centrifugal fan, for drawing in air through an air intake opening in the case of the optical equipment and an air flow path for supplying the drawn in air to the light valve device along plural paths. For this purpose, guide members are provided in the air flow path to divide and direct the air flow to individual parts of the light valve device along the plural paths.
Claims12
An optical equipment having a discharge lamp for supplying light, and a light valve device for projecting said light from said optical equipment, comprising:
- a case housing said discharge lamp and said light valve device, said case having two pairs of opposing side walls, and upper and lower walls;
- an air intake opening arranged on one side wall of said case;
- a ventilation device associated with said air intake opening so as to draw in air through said air intake opening;
- and
- a ventilation path arranged between an outlet of said ventilation device and said light valve device, wherein said ventilation path includes at least one partition member which divides said ventilation path into a plurality of air flow paths so as to cool separate portions of said light valve device by air from said ventilation device.
An optical equipment having a discharge lamp for supplying light, and a light valve device for projecting said light from said optical equipment, comprising:
- a ventilation device which draws in air in a first direction and which provides a flow of output air from said ventilation device in a second direction which is transverse to the first direction;
- and
- a ventilation path arranged between an outlet of said ventilation device and said light valve device;
- wherein said ventilation path includes at least one partition member which divides said ventilation path into a plurality of air flow paths so as to cool separate portions of said light valve device by air from said ventilation device.
Dependencies are inferred from the claim text.