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:
Jan. 05, 2010
Filed:
Dec. 25, 2003
Yasuhiro Suzuki, Hamamatsu, JP;
Seiichiro Mizuno, Hamamatsu, JP;
Yasuhiro Suzuki, Hamamatsu, JP;
Seiichiro Mizuno, Hamamatsu, JP;
Hamamatsu Photonics K.K., Hamamatsu-shi, Shizuoka, JP;
Abstract
The present invention aims at providing a photodetector which can detect the incident light intensity with a high speed while having a wide dynamic range for incident light intensity detection. Each photodiode PDgenerates electric charges Q by an amount corresponding to the intensity of light incident thereon. An electric charge amount level determining circuitis provided so as to correspond to the photodiode PD, determines the level of the amount of electric charges Q generated by the photodiode PD, and outputs a level signal Level indicative of the result of level determination. The capacitance value of the integral capacitance partin the integrating circuitis set by the respective level signals Level sequentially fed from N electric charge amount level determining circuitsto. The integrating circuitaccumulates the electric charges Q fed to the input terminal sequentially from the N electric charge amount level determining circuitstointo the integral capacitance part, and outputs a voltage Vcorresponding to the amount of thus accumulated electric charges Q from the output terminal.