Radiant energy – Photocells; circuits and apparatus – With circuit for evaluating a web – strand – strip – or sheet
Reexamination Certificate
2006-10-10
2006-10-10
Le, Que T. (Department: 2878)
Radiant energy
Photocells; circuits and apparatus
With circuit for evaluating a web, strand, strip, or sheet
C250S208100
Reexamination Certificate
active
07119350
ABSTRACT:
A spatial information detecting device using an intensity-modulated light is provided. This device comprises a photoelectric converter for receiving a light from a space into which a light intensity-modulated at a predetermined emission frequency is being irradiated, and generating an electrical output corresponding to an intensity of received light; a local oscillator circuit for outputting a local oscillator signal having a local oscillator frequency different from the emission frequency; a sensitivity controller for mixing the local oscillator signal with the electrical output to frequency convert the electrical output into a beat signal having a lower frequency than the emission frequency; an integrator for performing integration of said beat signal at a predetermined timing; and an analyzer for detecting information concerning the space according to an output of the integrator. According to this device, it is possible to accurately detect the spatial information without using a switching element having high-speed response at the light receiving side.
REFERENCES:
patent: 5754280 (1998-05-01), Kato et al.
patent: 5856667 (1999-01-01), Spirig et al.
patent: 6825455 (2004-11-01), Schwarte
patent: 6900895 (2005-05-01), Van Wiggeren
patent: 2001/0048519 (2001-12-01), Bamji et al.
patent: 2003/0164546 (2003-09-01), Giger
patent: 715284 (1998-03-01), None
patent: 197 04 496 (1998-03-01), None
patent: 198 21 974 (1999-11-01), None
patent: 60170778 (1985-09-01), None
patent: 64-013110 (1989-01-01), None
patent: 1-100492 (1989-04-01), None
patent: 3-2582 (1991-08-01), None
patent: 7-10381 (1995-04-01), None
patent: 11-508359 (1999-07-01), None
patent: 2000-121332 (2000-04-01), None
patent: 2000-517427 (2000-12-01), None
patent: WO-9701111 (1997-01-01), None
patent: WO-02/27352 (2002-04-01), None
International Search Report of PCT/JP03/04400 mailed on Oct. 15, 2003.
T. Spirig et al., “The Lock-in CCD—Two-Dimensional Synchronous Detection of Light”, IEEE Journal of Quantum Electronics, IEEE Inc., New York, U.S., vol. 31, No. 9, Sep. 1, 1995, pp. 1705-1708, XP000526180, ISSN: 0018-9197.
R. Schwarte et al., “New Optical Four-Quadrant Phase-Detector Integrated into a Photogate Array for Small and Precise 3D-Cameras”, Proceedings of the SPIE, SPIE, Bellingham, VA, U.S., vol. 3023, Feb. 11, 1997, pp. 119-128, ISSN: 0277-786X.
Japanese Examination Report Application No. 2003-051926 Dated Nov. 11, 2005.
Hashimoto Yusuke
Kurihara Fumikazu
Takada Yuji
Le Que T.
Matsushita Electric & Works Ltd.
Rader & Fishman & Grauer, PLLC
LandOfFree
Spatial information detecting device using... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Spatial information detecting device using..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Spatial information detecting device using... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3717728