Title:
INDUCTIVE PROXIMITY SWITCH
Document Type and Number:
Japanese Patent JP3955692
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide an inductive proximity switch with high reliability that has a large switching distance.
SOLUTION: The proximity switch consists of a coil, a means that supplies a transmission current pulse with periodically changing direction to the coil, and a signal processing means that replies a voltage induced in the coil with an attenuation current having been supplied to a body to be detected by an inducted voltage resulting from the transmission current pulse after the transmission pulse is supplied. A pattern of a transmission current indicates that the transmission current flows in a 1st direction only for a 1st time interval T11 shorter than a half of a period T21 of the transmission pulse for the 1st half period of a period T21 and then is attenuated for a time interval T11' and becomes negligibly small for the remaining time T12-T11', and flows only a 2nd time interval T13 in a direction reverse to the 1st direction, is attenuated for a time interval T13' and becomes negligibly small for a remaining time T14-T13'.
Inventors:
Peter Heimlich
Application Number:
JP3758599A
Publication Date:
August 08, 2007
Filing Date:
February 16, 1999
Export Citation:
Assignee:
Optosis Society anonym
International Classes:
H01H36/00; H03K17/945; H03K17/90; H03K17/95; (IPC1-7): H03K17/90; H01H36/00
Domestic Patent References:
| JP4334115A | ||||
| JP2501615A | ||||
| JP6386917A |
Foreign References:
| EP0492029A1 | ||||
| US4544892 |
Attorney, Agent or Firm:
Hideto Asamura
Hajime Asamura
Hayashi Zouzo
Kuniaki Shimizu
Hajime Asamura
Hayashi Zouzo
Kuniaki Shimizu
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