Intrusion detecting device

• US 20030156027A1
• Filed: 02/14/2003
• Published: 08/21/2003
• Est. Priority Date: 02/18/2002
• Status: Active Grant

• Current Assignee: Optex Company Limited (OPTEX GROUP Co., Ltd.)
• Original Assignee: Optex Company Limited (OPTEX GROUP Co., Ltd.)
• Inventors: Seo, Cholmin
• Granted Patent: US 6,943,685 B2
• Time in Patent Office: Days
• US Class Current: 340/523
• CPC Class Codes: G08B 13/191 using pyroelectric sensor means

Abstract

To provide an intrusion detecting device capable of generating one of different warnings in proper timing dependent on the behavior of an intruder entering an alert region to thereby browbeat the intruder effectively, the intrusion detecting device (1) includes a plurality of sensor units (8 and 9), a sound generating device (29) capable of generating first and second warnings different from each other one at a time, and a warning generating unit (23). The sensor units (8 and 9) have a plurality of alert areas (A1 to A4) defined from a site distant from and to another site near to a subject to be monitored for security purpose and operable to detect an intruder H entering any of the alert areas (A1 to A4). The warning generating unit (23) is operable to cause the sound generating device (29) to issue the first warning when detection is made by the sensor unit (8), and also to cause the sound generating device (29) to issue the second warning when detection is made by at least the sensor unit (9) during a first predetermined length of time T1 subsequent to the detection by such sensor unit (8).

Claims

1. An intrusion detecting device which comprises:

a plurality of sensor units having a plurality of alert areas defined from a site distant from and to another site near to a subject to be monitored for security purpose and operable to detect an intruder entering any of the alert areas;

a sound generating device capable of generating first and second warnings one at a time, said first and second warnings being different from each other; and

a warning generating unit operable to cause the sound generating device to issue the first warning when detection is made by one of the sensor units, and also to cause the sound generating device to issue the second warning when detection is made by at least another one of the sensor unit during a first predetermined length of time subsequent to the detection by such one of the sensor units.

2. The intrusion detecting device as claimed in claim 1, wherein said sound generating device has an additional capability of generating a third warning that is different from the first warning, and the warning generating unit is also operable to cause the sound generating device to issue the third warning when detection is made only by such one of the sensor units during a second predetermined length of time subsequent to the detection by such one of the sensor units.

3. The intrusion detecting device as claimed in claim 1, wherein said sound generating device has a further capability of generating a fourth warning, and the warning generating unit is also operable to cause the sound generating device to issue the fourth warning when detection is made at least by such another one of the sensor units during a third predetermined length of time subsequent to the detection by such another one of the sensor units.

4. The intrusion detecting device as claimed in claim 2, further comprising a security monitoring camera for monitoring at least portion of the alert areas, and an imaging control unit for activating the security monitoring camera in synchronism with the generation of one of the second and third warning.

5. The intrusion detecting device as claimed in claim 3, further comprising a security monitoring camera for monitoring at least portion of the alert areas, and an imaging control unit for activating the security monitoring camera in synchronism with the generation of one of the second, third and fourth warnings.