Title:
【発明の名称】人体検知装置の検知距離設定方法
Document Type and Number:
Japanese Patent JP2645941
Kind Code:
B2
Abstract:
PURPOSE:To set the optimum detecting distance automatically by controlling the value of a feeding current into a light projector of an infrared-ray sensor, which is operated with a pyroelectric sensor for detecting a human body, and changing the detecting distance of the sensor. CONSTITUTION:When a user approaches a toilet stool, a pyroelectric sensor detects the human body and outputs the detected signal. The light projector of an infrared-ray sensor starts the projection of the infrared rays. At this time, the current which is fed to the light projector is set at the low value. Then, the infrared rays are reflected from the human body and cast into a light receiving device. The detected signal is outputted. When the amount of the reflected amount is not sufficient, the current value, which is supplied into the light projector, is gradually increased until the detecting distance comes to have on optimum value and the light receiving device outputs the detected signal. When the light receiving device outputs the detected signal, the current value, which is supplied into the light projector, is fixed. Namely, the detecting distance is set at the optimum distance. Thus, the detecting operation of the human body is continued. In this way, it is not necessary to adjust the detecting distance of the infrared rays when the sensor is installed.
Inventors:
NAGATA MASAAKI
SHIRAI KENJI
SHIRAI KENJI
Application Number:
JP28741891A
Publication Date:
August 25, 1997
Filing Date:
August 09, 1991
Export Citation:
Assignee:
INATSUKUSU KK
International Classes:
G01S7/48; G01S17/02; (IPC1-7): G01S17/02; G01S7/48
Domestic Patent References:
| JP62154070U | ||||
| JP295885U |
Attorney, Agent or Firm:
Toshihiko Uchida