Auto-focusing method and projector using the same

Details Auto-focusing method and projector using the same Auto-focusing method and projector using the same

2007-04-17

2010-10-05

Pyo, Kevin (Department: 2878)

Optics: image projectors

Lens support

Lens position adjustable

C353S069000, C348S745000

Reexamination Certificate

active

07806534

ABSTRACT:
A projector for automatically adjusting images projected onto a screen includes a detecting module for detecting a propagation time for projected ultrasonic waves sent by the projector to be echoed back by the screen and received by the projector, a processing module for calculating a projection distance between the projector and the screen based on the propagation time, and outputting a focal length signal corresponding to the projection distance, an optical module, and an adjusting module for adjusting a local length of the optical module according to the focal length signal. A related method is also provided.

REFERENCES:
patent: 5479225 (1995-12-01), Kuga
patent: 6422704 (2002-07-01), Gyoten et al.
patent: 7092045 (2006-08-01), Haruna et al.
patent: 2004/0130685 (2004-07-01), Wu
patent: 2005/0195372 (2005-09-01), Ohara
patent: 2006/0022680 (2006-02-01), Suginouchi et al.

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