Security device

• US 20040135683A1
• Filed: 07/22/2003
• Published: 07/15/2004
• Est. Priority Date: 07/26/2002
• Status: Active Grant

• Current Assignee: Fujitsu Ten Limited (DENSO Corporation)
• Original Assignee: Fujitsu Ten Limited (DENSO Corporation)
• Inventors: Sakai, Naoki
• Granted Patent: US 7,057,497 B2
• Time in Patent Office: Days
• US Class Current: 340/522
• CPC Class Codes: B60R 25/1004 Alarm systems characterised by the type of sensor, e.g. current sensing means using door lock sensors B60R25/1001
• CPC Class Codes: B60R 25/1009 Sonic sensors; Signal treatment therefor
• CPC Class Codes: B60R 25/104 characterised by the type of theft warning signal, e.g. visual or audible signals with special characteristics
• CPC Class Codes: G08B 13/04 by breaking of glass
• CPC Class Codes: G08B 13/1663 using seismic sensing means
• CPC Class Codes: G08B 13/1672 using sonic detecting means, e.g. a microphone operating in the audio frequency range
• CPC Class Codes: G08B 25/001 Alarm cancelling procedures or alarm forwarding decisions, e.g. based on absence of alarm confirmation
• CPC Class Codes: G08B 29/183 Single detectors using dual technologies G08B13/1672, G08B13/2448, G08B13/2494 take precedence

Abstract

A security device includes an impact sensing unit for sensing an impact, a sound pressure sensing unit for sensing a sound pressure, an abnormal degree determination unit for determining an abnormal degree based on a level of an impact sensing signal sensed by the impact sensing unit and a level of a sound pressure sensing signal sensed by the sound pressure sensing unit, and an alerting process unit for performing a predetermined alerting process based on a determination result of the abnormal degree by the abnormal degree determination unit.

Claims

1. A security device comprising:

an impact sensing unit for sensing an impact to output an impact sensing signal;

a sound pressure sensing unit for sensing a sound pressure to output a sound pressure sensing signal;

an abnormal degree determination unit for determining an abnormal degree on the basis of a level of the impact sensing signal and a level of the sound pressure sensing signal to output a determination result; and

an alerting process unit for performing a predetermined alerting process on the basis of the determination result.

2. The security device according to claim 1, wherein the abnormal degree determination unit concludes that an illegal break-in is conducted when the level of the impact sensing signal is not less than a first predetermined value and the level of the sound pressure sensing signal is not less than a second predetermined value.

3. The security device according to claim 2, wherein the alerting process unit performs an alerting process corresponding to the illegal break-in.

4. The security device according to claim 1, wherein the abnormal degree determination unit concludes that the abnormal degree is not so severe as to lead to an illegal break-in when the level of the impact sensing signal is not less than a first predetermined value and the level of the sound pressure sensing signal is less than a second predetermined value.

5. The security device according to claim 4, wherein when the abnormal degree determination unit concludes that the abnormal degree is not so severe as to lead to the illegal break-in, the alerting process unit performs an alerting process with prealarm.

6. A security device comprising:

an impact sensing unit for sensing an impact to output an impact sensing timing;

a sound pressure sensing unit for sensing a sound pressure to output a sound pressure sensing timing;

an impacted object determination unit for determining an impacted object on the basis of the impact sensing timing and the sound pressure sensing timing to output a determination result; and

an alerting process unit for performing a predetermined alerting process on the basis of a determination result.

7. The security device according to claim 6, wherein when the impacted object determination unit concludes that the impact sensing timing is earlier than the sound pressure sensing timing, the impacted object determination unit concludes that the impacted object is a glass.

8. The security device according to claim 7, wherein when the impacted object determination unit concludes that the impacted object is the glass, the alerting process unit performs an alerting process corresponding to a breakage of the glass.

9. The security device according to claim 6, wherein when the impacted object determination unit concludes that the sound pressure sensing timing is earlier than the impact sensing timing, the impacted object determination unit concludes that the impacted object is other than a glass.

10. The security device according to claim 9, wherein when the impacted object determination unit concludes that the impacted object is other than the glass, the alerting process unit performs an alerting process corresponding to a portion other than the glass.

11. A security device comprising:

an impact sensing unit for sensing an impact to output an impact sensing signal and an impact sensing timing;

a sound pressure sensing unit for sensing a sound pressure to output a sound pressure sensing signal and a sound pressure sensing timing;

an abnormal degree determination unit for determining an abnormal degree on the basis of a level of the impact sensing signal and a level of the sound pressure sensing signal to output a first determination result;

an impacted object determination unit for determining an impacted object on the basis of the impact sensing timing and the sound pressure sensing timing to output a second determination result; and

an alerting process unit for performing a predetermined alerting process on the basis of the first determination result and the second determination result.