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Command-sensor-in-projection-display-apparatus

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Command sensor in projection display apparatus

Details

Inventors: Itoh, Masateru;
Assignee: Mitsubishi Denki Kabushiki Kaisha (Tokyo, JP)
Primary Examiner: Britton; Howard W.
Assistant Examiner: Vu; Kim Yen
Attorney, Agent or Firm:

A back-projection picture display apparatus which consists of a cabinet including a back-projection screen with a Fresnel lens plate, a video projector unit housed within the cabinet, and a remote control system including a remote controller for generating an infrared beam of a particular characteristic descriptive of a particular command with which the apparatus is operated and a command sensor operable in response to the infrared beam to operate the apparatus to accomplish a mode of operation assigned by such particular command. The command sensor is housed within the cabinet and arranged at a location where the infrared rays of light passing through the Fresnel lens plate are converged.

DETAILED DESCRIPTION The present invention has been devised with an aim at minimizing or substantially eliminating the above discussed problems inherent in the prior art remote control system and is intended to provide an improved remote control system for a back-projection picture display apparatus wherein the loss of the infrared rays of light emitted from the remote controller is advantageously minimized to permit the command sensor to receive a major portion thereof.
A still further object of the present invention is to provide the improved remote control system of the type referred to above, effective to minimize the occurrence of an erroneous operation of the picture display apparatus, even though a substantial distance exists between the remote controller and the command sensor, without adversely affecting the aesthetic layout of the cabinet.
In order to accomplish these objects of the present invention, there is provided an improved back-projection picture display apparatus comprising a cabinet including a back-projection screen which consists of a Fresnel lens plate, a video projector unit housed within the cabinet, and a remote control system including a remote controller for generating an infrared beam of a particular characteristic descriptive of a particular command with which the apparatus is operated and a command sensor operable in response to the infrared beam to operate the apparatus to accomplish a mode of operation assigned by such particular command.
The command sensor is housed within the cabinet and arranged at a location where external rays of light passing through the Fresnel lens plate are converged.
In accordance with the present invention, since the command sensor is so positioned within the cabinet as to have its light receiving area coincide or substantially coincide with the point where the infrared rays of light representing the infrared command emitted from the remote controller can converge after they have passed through the Fresnel lens plate forming the back-projection screen, a major portion of the infrared rays of light emitted from the remote controller can be received by the command sensor

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