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Title:
WINDOW OPENING/CLOSING DETECTING DEVICE
Document Type and Number:
Japanese Patent JP2010129010
Kind Code:
A
Abstract:

To surely detect an illegal act by mischief using a powerful magnet simultaneously with detection of window opening/closing.

A window opening/closing registration processing section 74 detects a magnetic level Vs by a magnet corresponding to the closed state of a window, by a window opening/closing detecting Hall sensor 46 to make initial registration, and registers a first determination threshold TH1 lower by a predetermined rate than the initially registered magnetic level Vs, and a second determination threshold TH2 higher by a predetermined rate than the magnetic level Vs. A window opening/closing determining section 78 determines a magnetic level when bringing the powerful magnet closer by the mischief or the like by the comparison with the second determination threshold in addition to the opening/closing determination of the window by the comparison between the first determination threshold TH1 and the detected magnetic force level, and regards it as window opening/closing and sounds an alarm.

COPYRIGHT: (C)2010,JPO&INPIT


Inventors:
SHIMA YASUSHI
NOGUCHI KOHEI
Application Number:
JP2008305790A
Publication Date:
June 10, 2010
Filing Date:
November 30, 2008
Export Citation:
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Assignee:
HOCHIKI CO
CIRCUIT DESIGN KK
International Classes:
G08B13/08; E05B41/00; E05B45/06; E05C3/04; E05F7/00
Domestic Patent References:
JP2007198722A2007-08-09
JP2008123280A2008-05-29
JP2003281636A2003-10-03
JP2008288030A2008-11-27
Attorney, Agent or Firm:
竹内 進