Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Reexamination Certificate
2006-07-27
2008-09-23
Yam, Stephen (Department: 2878)
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
C250S230000, C250S205000, C250S559220, C356S237200, C356S600000, C356S601000, C359S197100
Reexamination Certificate
active
07427747
ABSTRACT:
A control portion of an optical image pickup apparatus includes a scan driver, a lock-in amplifier, and an A/D converter. The scan driver outputs a predetermined drive signal to a Y-scanning mirror and an X-scanning mirror and scans the Y-scanning mirror and the X-scanning mirror. The lock-in amplifier detects a signal level Vout of a frequency component of the drive signal of the scan driver among signals detected by a detector portion. The A/D converter converts a signal detected by a detector portion and a signal level of the detected signal of a frequency component of a drive signal detected by the lock-in amplifier to digital signals and outputs the digital signals to an image processor. Thus, mirror scan operations of the scanning mirrors can be securely detected.
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Hirata Tadashi
Horii Akihiro
Ishihara Yasushige
Okawa Atsushi
Tokuda Kazunari
Olympus Corporation
Scully , Scott, Murphy & Presser, P.C.
Yam Stephen
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