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:
Sep. 13, 2011
Filed:
Sep. 05, 2007
Masaki Mizoguchi, Hamamatsu, JP;
Yasuhiro Suzuki, Hamamatsu, JP;
Seiichiro Mizuno, Hamamatsu, JP;
Hiroo Yamamoto, Hamamatsu, JP;
Masaki Mizoguchi, Hamamatsu, JP;
Yasuhiro Suzuki, Hamamatsu, JP;
Seiichiro Mizuno, Hamamatsu, JP;
Hiroo Yamamoto, Hamamatsu, JP;
Hamamatsu Photonics K.K., Hamamatsu-shi, Shizuoka, JP;
Abstract
A photodetecting deviceincludes a photodiode PD, a switch SWfor the photodiode, an integrating circuit, and a noise removing circuit. The integrating circuitaccumulates in a capacitor Can electric charge input from the photodiode PDthrough the switch SWfor the photodiode, and outputs a voltage value according to the amount of the accumulated electric charge. The noise removing circuitincludes an amplifier A, five switches SWto SW, four capacitors Cto C, and a power supply V. The noise removing circuittakes in a voltage value that is output from the integrating circuitat a time where the switch SWis first turned from a closed state to an open state, and after the time, outputs a voltage value according to a difference between the voltage value that is output from the integrating circuitand the voltage value previously taken in.