JPH0416483U

JPH0416483U -

Info

Publication number: JPH0416483U
Application number: JP5798190U
Authority: JP
Priority date: 1990-05-31
Filing date: 1990-05-31
Publication date: 1992-02-10

Description

[Brief explanation of the drawing]

第１図は本考案の一実施例における液晶プロジ
エクタの光学系を示す図、第２図は本実施例装置
の駆動回路を示す図である。第３図は従来例の光
学系を示す図である。３ａ，３ｂ……第１、第２投写用光源、１５ａ
，１５ｂ……第１、第２リレー、１７ａ，１７ｂ
……第１、第２制御回路、１８ａ，１８ｂ……第
１、第２照度センサ、７……回転台、８……駆動
モータ。 FIG. 1 is a diagram showing an optical system of a liquid crystal projector in an embodiment of the present invention, and FIG. 2 is a diagram showing a drive circuit of the device of this embodiment. FIG. 3 is a diagram showing a conventional optical system. 3a, 3b...first and second projection light sources, 15a
, 15b...first, second relay, 17a, 17b
...First and second control circuits, 18a, 18b...First and second illuminance sensors, 7... Rotating table, 8... Drive motor.

Claims

[Claims for Utility Model Registration] (1) A first projection light source, a first illuminance detection means for detecting the illuminance of the first projection light source, a second projection light source, and the first or second projection light source. and a light source switching means for selectively arranging the projection light source in the optical system path, when the output of the first illuminance detection means becomes equal to or less than a predetermined value, the light source switching means replaces the first projection light source with the light source. A projection light source device characterized in that a second projection light source is disposed in an optical system path. (2) A first projection light source, a first illuminance detection means for detecting the illuminance of the first projection light source, a second projection light source, and a second illuminance detection means for detecting the illuminance of the second projection light source. and a light source switching means for selectively arranging the first or second projection light source in the optical system path, when the output of the first illuminance detection means becomes equal to or less than a predetermined value, the second projection light source When the light source starts to be driven and the output of the second illuminance detection means exceeds a predetermined value,
A projection light source device, characterized in that the light source switching means arranges the second projection light source in the optical system path instead of the first projection light source.