Projection apparatus and distance measuring method for projection apparatus

A projection device and technology for projecting light, applied in the direction of using projection device image reproducer, projection device, color TV parts, etc., can solve problems such as errors
CN1863290AInactive Publication Date: 2006-11-15KK TOSHIBA
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
KK TOSHIBA
Publication Date
2006-11-15
Estimated Expiration
Not applicable · inactive patent

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Abstract

According to one embodiment, a projection apparatus comprises a projection unit (31) to emit projection light on an object in a first direction, a light emitting unit (C) to irradiate the object with a ray in a second direction which is different from the first direction by approximately four (4) degrees to thirty (30) degrees, a light receiving unit (D) to receive reflected light from the object from the ray irradiated by the light emitting unit in a third direction which is different from the first direction by approximately four (4) degrees to thirty (30) degrees, and a control unit (2, 27, 39) to adjust the projection light to be emitted by the projection unit in accordance with the reflected light received by the light receiving unit.
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Description

technical field

[0001] One embodiment of the invention relates to devices such as liquid crystal projectors or DLP TM A projection device of a projector, and a distance measuring method of the projection device for measuring the distance between the projection device and a screen onto which projection light is emitted. Background technique

[0002] In recent years, a large number of digital video image devices have been put on the market, and, for example, there is a projection device using a light source lamp, such as a liquid crystal projector or a DLP TM projector. A projection device such as a liquid crystal projector measures a distance from the projection device to a screen or an object, and performs focus adjustment based on the measured distance. Similarly, in order to measure the distance from the projection device to the screen, infrared rays are used in the projection device.

[0003] Japanese Patent Application Laid-Open Publication No. 11-264963 (hereinafter ...

Claims

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