Title:
OPTICAL SWITCH DEVICE AND COMPUTER NETWORK SYSTEM USING THE SAME
Document Type and Number:
Japanese Patent JP3117938
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide an optical switch device changing over a switch by acting only when abnormality occurs.
SOLUTION: A trigger pulse is generated by a one-shot multivibrator based on the change of state of an output signal from a D flip-flop circuit 23 caused by the loss of a main power source 22, and switching elements S1 and S2 or S3 and S4 are made in an on-state by the trigger pulse, whereby a solenoid coil 16 is energized by taking a capacitor 21 as a power source. The optical switch is changed over by the action of magnetic field formed by a current, and such a state is kept by the self holding function of the optical switch, so that the switching action corresponding to the change of state caused by the loss of the main power source 22 is obtained.
Inventors:
Naoyuki Hirayama
Tomohiro Yoshikawa
Mitsuo Yarida
Tomohiro Yoshikawa
Mitsuo Yarida
Application Number:
JP21374097A
Publication Date:
December 18, 2000
Filing Date:
August 07, 1997
Export Citation:
Assignee:
Seiko Instruments Inc.
International Classes:
G02B26/08; H04B1/74; H04B10/032; H04B10/038; H04B10/079; H04B10/27; H04B10/275; H04B10/29; H04B10/80; (IPC1-7): H04B10/02; G02B26/08; H04B1/74
Domestic Patent References:
| JP22439A | ||||
| JP4945655A | ||||
| JP6209284A | ||||
| JP6160737A |
Attorney, Agent or Firm:
Keinosuke Hayashi