Radiant energy – Photocells; circuits and apparatus – Photocell controls its own optical systems
Reexamination Certificate
2006-04-18
2006-04-18
Le, Que T. (Department: 2878)
Radiant energy
Photocells; circuits and apparatus
Photocell controls its own optical systems
C250S235000
Reexamination Certificate
active
07030353
ABSTRACT:
A method and apparatus are provided to controllably reduce power of a laser projection display (LPD) in response to detecting a variation in a viewing surface. During the operation of the LPD, a controller142monitors laser light being reflected from the viewing surface. Since the controller142“knows” the amount of power that the LPD is being instructed to deliver, it may compare the known power to the reflected laser light to determine if a foreign object may be in the path of the laser light, and therefore, affecting the magnitude of the laser light. The controller142responds to detecting such an event by reducing power to the lasers.
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Dvorkis Paul
Goldman Ron
Nambudiri Narayan
Stern Miklos
Tan Chinh
Kirschstein et al.
Le Que T.
Symbol Technologies,Inc.
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