Projection display apparatus
AssigneeMitsubishi Electric Corporation
InventorShinji Yagyu
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Abstract
In a projection display apparatus in which a laser beam source and an optical engine are connected together through an optical fiber, safety is improved against temperature rise in the optical fiber and its periphery. A projection display apparatus includes a temperature sensor 4 provided on the end portion, of the side of an optical engine 6, of an optical fiber group 1 for connecting a laser beam source 5 and the optical engine 6 to each other, in which, by detecting temperature and informing to a controlling unit 71 for controlling the laser beam source 5, when temperature rise exceeding a set value having been set previously is detected, the controlling unit 71 is made to control so as to decrease or stop output from the laser beam source 5.
Claims8
A projection display apparatus comprising:
- a laser beam source for outputting a laser beam;
- an optical engine for receiving the laser beam outputted from the laser beam source through an optical fiber group, and magnifying and outputting an image;
- a temperature sensor for detecting a temperature of the optical fiber group;
- and
- a controlling unit for controlling the output from the laser beam source in response to an output from the temperature sensor to prevent heat related damage to the optical fiber group, wherein the temperature sensor is provided at an emitting end of the optical fiber group such that when the temperature of the optical fiber group exceeds a predetermined threshold value, the controlling unit decreases or stops the laser output from the laser beam source.
Dependencies are inferred from the claim text.