Title:
VEHICULAR GLASS BREAKAGE ALARM SYSTEM
Document Type and Number:
Japanese Patent JP3802897
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To detect glass breakage without malfunction in order to prevent vehicle theft by glass breakage.
SOLUTION: A pressure sensor such as a piezoelectric microphone or omnidirectional capacitor microphone detects a sudden negative pressure generated upon the glass breakage of a vehicle to generate an alarm signal. A glass breaking sound generated along with the negative pressure is also detected, so that the combination thereof can prevent the malfunction more reliably.
Inventors:
Takashima Mitsuru
Application Number:
JP2003360602A
Publication Date:
July 26, 2006
Filing Date:
October 21, 2003
Export Citation:
Assignee:
MI Lab Co., Ltd.
International Classes:
G08B13/04; B60R25/00; B60R25/31; B60R25/34; G08B13/00; (IPC1-7): G08B13/04; B60R25/00; B60R25/10; G08B13/00
Domestic Patent References:
| JP7500438A | ||||
| JP2140898A | ||||
| JP6020164A | ||||
| JP4367998A | ||||
| JP4076568U | ||||
| JP2003006752A | ||||
| JP2003173476A |
Attorney, Agent or Firm:
Mitsuo Takahashi