Title:
PHOTODETECTOR
Document Type and Number:
Japanese Patent JPH03284883
Kind Code:
A
Abstract:
PURPOSE:To reduce the number of components, cost and circuit area in an electronic circuit in a camera in which a photodetector is mounted by disposing a second photodetector having a sensitivity in a visible light region at incident side from a first photodetector having a sensitivity in an infrared region, and forming them in one chip. CONSTITUTION:A second photodetector 3 made of amorphous silicon and having a sensitivity in a visible light region is disposed at an incident side from a first photodetector 1 made of single crystalline silicon and having a sensitivity in an infrared region, and the photodetectors 1, 3 are formed in one chip. When a light is incident, most of the incident light of the visible light region is absorbed by the photodetector 3, and converted to a current. The light having long wavelength (infrared ray) passed through the photodetector 3 without absorption is arrived at the photodetector 1, is absorbed thereto, and converted to a current. Since the photodetector 3 operates as a visible light cutoff filter, the photodetector 1 detects only a specific signal.
Inventors:
OZAWA HISANORI
ZENNO YOSHIICHI
ZENNO YOSHIICHI
Application Number:
JP8679290A
Publication Date:
December 16, 1991
Filing Date:
March 30, 1990
Export Citation:
Assignee:
SHARP KK
International Classes:
H01L31/10; (IPC1-7): H01L31/10
Domestic Patent References:
| JPS6269568A | 1987-03-30 |
Attorney, Agent or Firm:
Nakamura Tsunehisa
Previous Patent: SEMICONDUCTOR THIN FILM AND MANUFACTURE THEREOF
Next Patent: LOCK MOUNTING STRUCTURE
Next Patent: LOCK MOUNTING STRUCTURE