Laser projector

Details Laser projector Laser projector

2009-04-15

2011-11-15

Epps, Georgia (Department: 2878)

Optics: image projectors

Lamp control

C372S029010

Reexamination Certificate

active

08057052

ABSTRACT:
Disclosed in a laser projector to display an image by projecting a laser beam from a laser light source to a projection screen including an electromagnetic driven scan mirror to scan the laser beam from the laser light source, a detection unit to detect a back EMF which is generated by a drive of the electromagnetic driven scan mirror at a time of start-up of the laser projector, a first determination unit to determine whether a value of the back EMF which is detected by the detection unit exceeded a predetermined threshold or not and a light source control unit to start a lighting of the laser light source when the value of the back EMF is determined as exceeding the predetermined threshold by the determination unit.

REFERENCES:
patent: 2001/0032884 (2001-10-01), Ring et al.
patent: 2003/0042801 (2003-03-01), Miyajima et al.
patent: 2005/0264501 (2005-12-01), Choi et al.
patent: 2007/0222953 (2007-09-01), Bock et al.
patent: 2004-333698 (2004-11-01), None
patent: 2004333698 (2004-11-01), None
Extended European Search Report dated Sep. 14, 2009 (Four (4) pages).

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