Optics: measuring and testing – Photometers – Comparison
Reexamination Certificate
2007-10-23
2007-10-23
Lauchman, L. G. (Department: 2877)
Optics: measuring and testing
Photometers
Comparison
C356S213000, C356S300000
Reexamination Certificate
active
10841189
ABSTRACT:
A correction LED is provided to illuminate a light receiving sensor array, and a calculation controlling circuit calculates correction values at the respective illuminance levels based on sensor output levels expected at the respective illuminance levels and actual sensor output levels while successively turning the correction LED on at a plurality of illuminance levels whose illuminance ratios are at least known, and corrects a sensor output level by the corresponding correction value to obtain a measurement output at the time of an actual measurement. The discontinuity of an input/output characteristic resulting from the switching of gains of an amplifier for amplifying a photocurrent and the non-linearity caused by the saturation of the photoelectrically converting characteristic of the optical sensor and the exponential characteristics of the optical sensor and the amplifier can be corrected without employing a large-scale construction such as a bench. The non-linearity can be highly precisely and efficiently corrected in a measuring apparatus realized as a spectral luminometer or a spectral colorimeter without requiring a special facility.
REFERENCES:
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patent: 5229838 (1993-07-01), Ganz et al.
patent: 6567160 (2003-05-01), Ishikawa et al.
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“Notice of Reasons for Rejection,” (Office Action) for Japanese Patent Application No. 2003-392456, issued Oct. 4, 2005, 5 pages.
“Notice of Reasons for Rejection,” Japanese Patent Office Action for Japanese Patent Application No. JP 2003-392456, mailed Jul. 18, 2006, 4 pages.
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