Projector with tilt-angle detecting capability

Details Projector with tilt-angle detecting capability Projector with tilt-angle detecting capability

2007-08-07

2007-08-07

Mahoney, Christopher (Department: 2851)

Optics: image projectors

Distortion compensation

For projection axis inclined to screen

C348S745000

Reexamination Certificate

active

10866299

ABSTRACT:
A projector includes two range sensors of a phase difference method. The range sensors are laid out near a projection lens in such a way that a line connecting the centers of two photo-sensor arrays incorporated in one of the range sensors crosses a line connecting the centers of two photo-sensor arrays incorporated in the other range sensors approximately at the right angles. A control section controls those range sensors to measure distances to a plurality of ranging points on a screen. The control section computes the tilt angle of the screen based on the measured distances and supplies the computed tilt angle to a trapezoid correcting section and an optical mechanism section.

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