Title:
TELEPHONE SET WITH SENSOR FOR CHECKING INCORRECT WIRING
Document Type and Number:
Japanese Patent JP3492778
Kind Code:
B2
Abstract:
PURPOSE: To obtain a telephone set in which no fault is produced with a simple structure and the leakage of an electric signal outside is prevented by allowing a sensor to be in the connection state except the interrupt state of a connection section by a prescribed mechanical means for passing of an IC card itself and allowing the connection section to electrically open the wiring of the sensor in the case of that other than a prescribed interrupt state.
CONSTITUTION: A sensor section 102 is wired via a connection section 103 mechanically connecting/interrupting electric connection so as to cross an IC card passing face in the inside of the telephone set in the vicinity of a card insert port 106. When an IC card 110 having incorrect wiring 120 is inserted, the wiring of the sensor section 102 is electrically opened (interrupted) by the connection section 103, no current flows to the sensor section 102 thereby the presence of incorrect wiring is discriminated. Then the connection of a terminal of an incorrect IC card to a contact 104 is commanded to be disable.
Inventors:
Masaki Wakamatsu
Application Number:
JP22276794A
Publication Date:
February 03, 2004
Filing Date:
August 25, 1994
Export Citation:
Assignee:
Dai Nippon Printing Co.,Ltd.
International Classes:
H04M17/00; (IPC1-7): H04M17/00
Domestic Patent References:
| JP23879A |
Attorney, Agent or Firm:
Satoshi Kanayama
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