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Title:
FAIL-SAFE MULTIPLE OPTICAL-AXIS LIGHT BEAM SENSOR
Document Type and Number:
WIPO Patent Application WO/1995/010789
Kind Code:
A1
Abstract:
By use of shift registers, generated are scanning output signals for synchronously driving a light emitting diode (LD) and a photodetector (PD) both facing each other. Based on the output of the shift register (5) on the light emitting side, whether the scanning output signal is normal or abnormal is judged by addition operated in a scanning output signal checking circuit (9), and at the same time, whether or not the final stage outputs of the shift registers on the light emitting side and photodetecting side coincide with each other is judged by a coincidence detection circuit (10). When the sensor system is abnormal, the sensor output is not generatd (logic value is zero). A simple sensor system having such a fail-safe function can be provided.

Inventors:
ANZAI HIROJI (JP)
SUGIYAMA TAKASHI (JP)
ISHIOROSHI TETSUYA (JP)
KATO MASAKAZU (JP)
Application Number:
PCT/JP1993/001463
Publication Date:
April 20, 1995
Filing Date:
October 12, 1993
Export Citation:
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Assignee:
NIPPON SIGNAL CO LTD (JP)
ANZAI HIROJI (JP)
SUGIYAMA TAKASHI (JP)
ISHIOROSHI TETSUYA (JP)
KATO MASAKAZU (JP)
International Classes:
F16P3/14; G01V8/00; G01V8/10; G01V8/20; H03K5/15; (IPC1-7): G01V9/04
Foreign References:
JPS57142578A1982-09-03
JPS61198089A1986-09-02
JPS61198094A1986-09-02
JPH0470589A1992-03-05
JPH0330338U1991-03-26
Other References:
See also references of EP 0675376A4
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