Optics: measuring and testing – Range or remote distance finding – With photodetection
Reexamination Certificate
2007-09-19
2009-02-10
Alsomiri, Isam (Department: 3662)
Optics: measuring and testing
Range or remote distance finding
With photodetection
C356S004010
Reexamination Certificate
active
07489390
ABSTRACT:
A pulse light receiving time measurement apparatus according to the present invention includes a light receiving element receiving reflected pulse light from an object to be measured; a pulse light receiving time measurement circuit measuring a time when pulse light is irradiated to the object and a time when the reflected pulse light from the object is received at the light receiving element; a resonance circuit converting an optical pulse signal of the reflected pulse light from the light receiving element into a damping signal; a multi-stage amplifier group amplifying the damping signal from the resonance circuit; a damping signal processing circuit composed of amplitude comparators and zero-cross comparators, and processing the damping signal from each stage of the multi-stage amplifier group, in which operations of the respective zero-cross comparators are determined according to comparison results of the respective amplitude comparators for the amplifier group.
REFERENCES:
patent: 5932802 (1999-08-01), Ogawa
patent: 7245359 (2007-07-01), Hoashi
patent: 7405812 (2008-07-01), Bamji
patent: 2005-214786 (2005-08-01), None
Minegishi Isao
Yoshino Ken-ichiro
Alsomiri Isam
Chapman and Cutler LLP
Kabushiki Kaisha TOPCON
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