Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Reexamination Certificate
2007-11-06
2007-11-06
Pyo, Kevin (Department: 2878)
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
C250S216000, C359S251000, C359S301000
Reexamination Certificate
active
11230518
ABSTRACT:
A polarization separating element such as a beam splitter receives a first light of a first polarization plane. The polarization separating element derives out of the first light a second light of a second polarization plane set perpendicular to the first polarization plane. A photoelectric element converts the second light into an electric signal. The intensity of the second light is in this manner detected. Since the second light is derived out of the first light, the phase of the second light is allowed to synchronize with the phase of the first light. The extinction ratio of the second light accurately reflects the extinction ratio of the first light. The detection of the intensity of the second light at the photoelectric element enables an accurate detection of the intensity of the first light.
REFERENCES:
patent: 5467336 (1995-11-01), Ando et al.
patent: 5963357 (1999-10-01), Kubota et al.
patent: 2005/0105848 (2005-05-01), Yamada et al.
patent: 59-197012 (1984-11-01), None
patent: 2-207215 (1990-08-01), None
patent: 4-263215 (1992-09-01), None
patent: 4-311918 (1992-11-01), None
patent: 10-221664 (1998-08-01), None
patent: 2002-182050 (2002-06-01), None
patent: 2003-279604 (2003-10-01), None
patent: 2004-271681 (2004-09-01), None
EP 05255822 Search Report dated Oct. 9, 2006.
Fujitsu Limited
Pyo Kevin
Westerman, Hattori, Daniels & Adrian , LLP.
LandOfFree
Light intensity detector does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Light intensity detector, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Light intensity detector will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3817149