Title:
【発明の名称】自鳴式物品監視装置
Document Type and Number:
Japanese Patent JP3335345
Kind Code:
B2
Abstract:
An article surveillance security system with self-alarm operates at 6 through 10 MHz as a central frequency, receives a swept low level radio wave within +/-5 through 15% from the central frequency, and sounds the alarm. It includes a tuning circuit (1) tuning to the central frequency, and a differential amplifier (2) for amplifying and detecting the output of the tuning circuit. The load resistance (R1) of the differential amplifier is set to 3 through 5 M OMEGA , and the operating current of the differential amplifier is set to 3 mu A or less. The base-emitter of the amplification/detection transistor (Tr1) of the differential amplifier are connected to the base-emitter of another diode-connected transistor (Tr2) to stabilize a bias drift by temperature. Thus, a receiving circuit of an article surveillance security system with self-alarm (tag) is realized with ability having a power supply of approximately four-year durability, stably operating with a very low level radio wave at 8.2 MHz, and suppressing external noise, especially a malfunction at a frequency band of a mobile telephone.
Inventors:
Nakasatsu History
Hitoshi Hasegawa
Hitoshi Hasegawa
Application Number:
JP2000584445A
Publication Date:
October 15, 2002
Filing Date:
November 22, 1999
Export Citation:
Assignee:
Kojin Co., Ltd.
International Classes:
G08B3/10; G08B13/24; (IPC1-7): G08B13/24
Domestic Patent References:
| JP4242892A |
Attorney, Agent or Firm:
Yasuhisa Nomura