Angle detecting apparatus and projector having the same

Details Angle detecting apparatus and projector having the same Angle detecting apparatus and projector having the same

2006-05-09

2006-05-09

Tarcza, Thomas H. (Department: 3662)

Optics: measuring and testing

Angle measuring or angular axial alignment

Photodetection of inclination from level or vertical

C356S003010, C356S152100

Reexamination Certificate

active

07042560

ABSTRACT:
A control circuit computes relative horizontal and vertical inclination angles between a screen and a projector by a line-type passive range-finding device. A display driving section adjusts a projection optical system including a condensing lens on the basis of the vertical and horizontal inclination angles computed by the control circuit, thereby correcting for a keystone distortion in an image projected.

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