Title:
INFRARED RAY DETECTING DEVICE
Document Type and Number:
Japanese Patent JPH02173531
Kind Code:
A
Abstract:
PURPOSE:To limit back light without providing a cold shield and to miniaturize and simplify the vicinity of a photodetector by setting an infrared optical fiber in the photodetector of an infrared light receiving element. CONSTITUTION:The infrared optical fiber 11 whose diameter of core is larger than that of the photodetector 13 is provided in the photodetector 13 of the infrared light receiving element 6. In the case that the 6 is an array, the fiber 11 is provided every picture element 13 which is the photodetector. When the device is produced by changing the length of the fiber 11 and is compared with a conventional one, they exhibit nearly equal infrared signal detecting ability at 1mm length of the fiber. When the diameter of core of the fiber 11 is made smaller than that of the photodetector 13 of the infrared element 6, the infrared signal detecting ability thereof lowers. By providing the fiber 11 whose diameter of core is larger than that of the photodetector 13 in the photodetector 13 of the infrared element 6, the back light is efficiently limited and the infrared signal detecting ability is enhanced. In the case that the element 6 is an array, moreover, the infrared signal detecting ability of each picture element can be uniformized.
Inventors:
KOMINE YOSHIHARU
Application Number:
JP32838788A
Publication Date:
July 05, 1990
Filing Date:
December 26, 1988
Export Citation:
Assignee:
MITSUBISHI ELECTRIC CORP
International Classes:
G01J1/02; G01J5/08; (IPC1-7): G01J1/02; G01J5/08
Attorney, Agent or Firm:
Kenichi Hayase