Title:
PULSE COUNT TYPE INFRARED DETECTING DEVICE
Document Type and Number:
Japanese Patent JP3122832
Kind Code:
B2
Abstract:
PURPOSE: To provide a pulse count type infrared detecting device having little malfunction in such environmental conditions that wind infiltrates into the indoor side through a window.
CONSTITUTION: A condensing lens 2 collects light, and a light receiving element 3 receives light. When the infrared output converted into the electric signal exceeds the prescribed pulse count number Np in a pulse count time Tp set in advance, an infrared detecting device 1 outputs the human body detection signal. The infrared detecting device 1 is provided with pulse count changing/ setting means A, A' automatically changing and setting the pulse count time Tp and the pulse count number Np in response to the infrared output in the measuring time T set in advance.
Inventors:
Ryo Morimoto
Application Number:
JP9855095A
Publication Date:
January 09, 2001
Filing Date:
April 24, 1995
Export Citation:
Assignee:
MATSUSHITA ELECTRIC WORKS,LTD.
International Classes:
G01V8/12; G01J1/02; G01J1/42; (IPC1-7): G01V8/12; G01J1/02; G01J1/42
Domestic Patent References:
| JP8122145A | ||||
| JP652451A | ||||
| JP4164284A |
Attorney, Agent or Firm:
Hiroyuki Nakai
Previous Patent: JPH03122831
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