Title:
HUMAN BODY DETECTION CONTROL SWITCH
Document Type and Number:
Japanese Patent JP3168308
Kind Code:
B2
Abstract:
PURPOSE: To allow effective lighting of illuminator by switching and updating the OFF delay time such that it is lengthened when a human body enters into the coverage of detecting beam and a detection signal is outputted whereas it is shortened when the human body departs from the coverage of detecting beam and a detection signal is outputted.
CONSTITUTION: When a human body traverses a detecting beam, a positive detection signal is outputted to produce an ON signal and a long OFF delay time is previously set but a negative detection signal is outputted immediately thereafter to produce an ON signal and the preset OFF delay time is reset to a short one. When the human body enters into the coverage of detecting beam and stays therein, a positive detection signal is outputted to produce an ON signal thus setting a long preset OFF delay time which is not updated thereafter. Consequently, control signal is not turned OFF so long as a person stays in the detection area but it is turned ON quickly upon retreat of the person from the detection area thus avoiding useless lighting of illumination.
Inventors:
Shinji Kirihata
Application Number:
JP22703092A
Publication Date:
May 21, 2001
Filing Date:
August 26, 1992
Export Citation:
Assignee:
MATSUSHITA ELECTRIC WORKS,LTD.
International Classes:
G01V8/12; (IPC1-7): G01V8/12
Domestic Patent References:
| JP2118293U | ||||
| JP451796U |
Attorney, Agent or Firm:
Hiroyuki Nakai