Image projector and image correction method
AssigneeCanon Kabushiki Kaisha
InventorsYasuhiro Shimada, Atsushi Kandori
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Abstract
An image projector of the present invention which is capable of automatically adjusting a size of an image area and a focal distance has light sources with a device for modulating light for forming an image, a measuring light source for supplying measuring light, a mixing optical system for mixing the light for forming an image and the measuring light on one optical axis, a projection device for scanning the light mixed by the mixing optical system and projecting the mixed light onto a screen, a photodetector for detecting the measuring light reflected by the screen, and correction devices for correcting an image by controlling the projected light on the basis of a result of detection by the photodetector.
Claims21
An image projector comprising:
- a light source having a modulator for modulating light for forming an image;
- a measuring light source for supplying measuring light;
- a mixing optical system for mixing the light for forming an image and the measuring light on one optical axis;
- an optical deflector for scanning the light mixed by said mixing optical system and projecting the mixed light onto a screen to form an image;
- a photodetector for detecting the measuring light reflected on the screen;
- and
- a correction system for correcting the image by controlling the projected light on the basis of a result of detection performed by the photodetector.
An image correction method comprising the steps of:
- mixing light for forming an image and measuring light on one optical axis of using a mixing optical system;
- scanning the mixed light by an optical deflector and projecting the light onto a screen to form an image;
- and
- detecting light reflected by the screen by using a photodetector;
- and
- correcting the image by controlling the projected light on the basis of a result of detection using the photodetector in said detection step.
Dependencies are inferred from the claim text.