Liquid crystal projection apparatus and lamp
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorsTakehiro Okada, Makoto Hoshino
Life of this patent
Estimating the term…
Abstract
In a liquid crystal projection apparatus having a plurality of lamps, and a plurality of cooling means for cooling the plurality of lamps individually, the lamp includes the following: a cup-shaped reflecting mirror 41 having an air discharge hole 41A, an insulator 50 having an air suction hole 50A, a front glass 42, a light emitting tube 40, and air passages (a) to (c) in the lamp for cooling the light emitting tube. The cooling means 12 sucks in hot air from the lamp, and exhausts the hot air toward the louver of the case. Thus, the lamps and the liquid crystal projection apparatus are cooled effectively.
Claims8
A lamp comprising:
- a cup-shaped reflecting mirror, the cup-shaped reflecting mirror having an air discharge hole;
- an insulator fitted to the bottom of the cup-shaped reflecting mirror, the insulator having an air suction hole;
- a front glass fitted to the opening end of the cup-shaped reflecting mirror;
- a light emitting tube held by the insulator and disposed inside of the cup-shaped reflecting mirror;
- and
- an air passage from the air suction hole to the air discharge hole for cooling the light emitting tube.
A liquid crystal projection apparatus for projecting an image of a liquid crystal panel, comprising:
- a plurality of lamps as a light source, each lamp of said plurality of lamps having furnished a cooling device for cooling the lamp;
- an optical system including a liquid crystal panel and a projection lens for projecting the image of the liquid crystal panel and the projected image formed of the light from the lamps;
- and
- a case of the liquid crystal projection apparatus;
- wherein each lamp includes a cup-shaped reflecting mirror having an air discharge hole, an insulator fitted to a bottom of said cup-shaped reflecting mirror and having an air suction hole, a front glass fitted to an opening end of said cup-shaped reflecting mirror, a light emitting tube held by said insulator and disposed inside of said cup-shaped reflecting mirror, and an air passage from said air suction hole to said air discharge hole for cooling said light emitting tube.
Dependencies are inferred from the claim text.