Projector, method of measuring distance to the projector,...

Details Projector, method of measuring distance to the projector,... Projector, method of measuring distance to the projector,...

2007-08-10

2010-02-23

Tarcza, Thomas H (Department: 3662)

Optics: measuring and testing

Range or remote distance finding

With photodetection

Reexamination Certificate

active

07667825

ABSTRACT:
A light source165of a projection unit16AM modulates an electric current supplied to a built-in LED. The projection unit16projects the modulated light on a projection screen. A photoreceiver171receives, with a time lag, a reflected portion of the modulated light from the screen, which corresponds to a time required for the light to travel from its projection to its reception. A calculation unit173acquires a phase difference between the projected light and its reflection at a respective one of a plurality of points on the screen, acquires a distance from the projector to the respective one of the plurality of points on the screen, and then acquires an inclination angle of the screen. Because the distance from the projector to a respective one of the plurality of points on the screen is acquired based on the corresponding phase difference, the measurement accuracy is improved compared to the triangular distance measuring method. The projector requires no distance measurement-only light source, thereby reducing the size of the projector.

REFERENCES:
patent: 2002/0154812 (2002-10-01), Chen et al.
patent: 2002/0196424 (2002-12-01), Sano et al.
patent: 2004/0252283 (2004-12-01), Ogawa
patent: 2005/0012907 (2005-01-01), Inoue
patent: 2005-233880 (2005-09-01), None

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