Laser projection apparatus

Details Laser projection apparatus Laser projection apparatus

2007-12-18

2008-11-11

Phan, James (Department: 2872)

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

C359S208100, C353S099000

Reexamination Certificate

active

07450285

ABSTRACT:
A laser projection apparatus PJ includes: laser devices; incident optical systems, each of which is supplied with light beam from the laser device; a scanning device for two-dimensionally scanning the light beam; and a projection optical system for projecting the light beam from the scanning device onto a screen; wherein the scanning device includes a resonant drive mirror for performing deflection in a main scanning direction, and at least one light source image is formed in an optical path ranging from the scanning device to the screen SC, and the projection optical system includes two reflecting mirrors which has such a power that, with respect to the main scanning direction, a positive power thereof becomes increasingly greater toward peripheries of the main scanning direction, and each of the incident optical systems has a power in the main scanning direction and a power in the sub scanning direction, one power being different from another power, thereby achieving a laser projection apparatus using a projection optical system which is easy to downsize, has velocity uniformity and has successful projection characteristics and brightness.

REFERENCES:
patent: 7264360 (2007-09-01), Hatakeyama et al.
patent: 7385745 (2008-06-01), Ishihara
patent: 2006/0139718 (2006-06-01), Ishihara
patent: 2008/0143979 (2008-06-01), Konno
patent: 2004-252012 (2004-09-01), None
patent: 2006-178346 (2006-07-01), None

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