The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 18, 2005
Filed:
Feb. 01, 2002
Seiichiro Mizuno, Hamamatsu, JP;
Haruhiro Funakoshi, Hamamatsu, JP;
Seiichiro Mizuno, Hamamatsu, JP;
Haruhiro Funakoshi, Hamamatsu, JP;
Hamamatsu Photonics K.K., Shizuoka, JP;
Abstract
A signal current corresponding to an incident light intensity is output from a photodiode PD, the signal current is converted into a signal voltage by an integration circuit, and the amount of a change in signal voltage in a predetermined time is output from a CDS circuit. The difference between two voltage values output from the CDS circuitis obtained by a difference arithmetic circuitand held by a S-H circuit. In addition, the maximum value of voltage values obtained by the difference arithmetic circuitsof respective unitsis obtained by comparison circuitsof the respective units 100, a reference signal voltage generation circuit, a final coincidence determination circuit, and a reference voltage hold circuit, and on the basis of the maximum value, the A/D conversion range of an A/D conversion circuitis set.