Title:
MULTIPLE OPTICAL AXIS PHOTOELECTRONIC SENSOR
Document Type and Number:
Japanese Patent JP3825671
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a multiple optical axis photoelectronic sensor capable of improving the detection accuracy of interference light without making a period for interference light detection long and simplifying a signal line.
SOLUTION: When all of LEDs 11a to 11d become non-light projection timing at which the LEDs 11a to 11d do not project light, a microcomputer 26 for light reception transmits a signal of an H level to output circuits 25a to 25d to validate signal outputs of the whole output circuits 25a to 25d. If any of PDs 21a to 21d receives light and outputs a light reception detection signal, an output circuit outputs a signal with an open collector output and the signal is inputted to the microcomputer 26 for light reception through a common output line L1. Also, at light projection timing, a selection circuit 27 sequentially switches analog switches 24a to 24d to an on state, and a signal is outputted from an output circuit with a complementary output and inputted to the microcomputer 26 for light reception through the common line L1.
Inventors:
Kawai Masatoshi
Daisuke Hayakawa
Daisuke Hayakawa
Application Number:
JP2001318651A
Publication Date:
September 27, 2006
Filing Date:
October 16, 2001
Export Citation:
Assignee:
Thanks Co., Ltd.
International Classes:
H03K17/78; (IPC1-7): H03K17/78
Domestic Patent References:
| JP5075421A | ||||
| JP7122989A | ||||
| JP2002359547A | ||||
| JP2003133934A |
Attorney, Agent or Firm:
Arisa Ushiro