Wireless anti-theft device

• US 6,972,666 B2
• Filed: 12/31/2003
• Issued: 12/06/2005
• Est. Priority Date: 12/31/2003
• Status: Expired due to Fees

• Current Assignee: Shu-Chen Lu
• Original Assignee: Shu-Chen Lu
• Inventors: Chen, Tse-Hsing
• Primary Examiner(s): SWARTHOUT, BRENT
• Application Number:
  US10/748,261
• Publication Number:
  US 20050151627A1
• Time in Patent Office: 706 Days
• Field of Search: 340/5.61, 340/5.64, 340/5.65, 340/825.36, 340/825.69, 340/825.72, 340/426.1, 340/426.13, 340/426.16, 340/426.18, 340/426.22, 307/10.2
• US Class Current: 340/426.16
• CPC Class Codes: B60R 25/1003 Alarm systems characterised by arm or disarm features
• CPC Class Codes: B60R 25/104 characterised by the type of theft warning signal, e.g. visual or audible signals with special characteristics

Abstract

A wireless anti-theft device mainly includes a host having a power-supply voltage-stabilizing circuit, an anti-theft coding and CPU circuit, a host control circuit, an emitting circuit, a host receiving circuit, and an I/O socket; and a wireless siren being internally provided with a power-supply voltage-stabilizing circuit, an RF wireless receiving circuit, a decoding and CPU circuit, and an anti-theft voicing and driving circuit. The anti-theft coding and CPU circuit generates Manchester anti-theft code having a Hi-Low ratio of 1:1, so that the wireless siren could quickly and accurately analyze received data code to emit precise warning sound.

Claims

1. A wireless anti-theft device, comprising:

a host having a power-supply voltage-stabilizing circuit for supplying power to different components of said host, an anti-theft coding and CPU circuit for generating data code in the form of Manchester anti-theft code having a Hi-Low ratio of 1;

1, a host control circuit for controlling operations of different components of said host, an emitting circuit for emitting an anti-theft signal, a host receiving circuit for receiving a remote signal, and an input/output (I/O) socket for electrically connecting to a power receptacle on a car; and

a wireless siren being internally provided with a power-supply voltage-stabilizing circuit for supplying power to different components of said wireless siren, an RF wireless receiving circuit for receiving an RF anti-theft signal from said host, a decoding and CPU circuit for decoding and comparing said anti-theft signal received by said RF wireless receiving circuit; and

an anti-theft voicing and driving circuit for generating warning sound and anti-theft control;

whereby said wireless siren controlled by aid host is able to accurately analyze said data code within very short time, so that interference of said wireless anti-theft device with or by other similar devices is effectively reduced to enable quick and accurate control of anti-theft operations of said wireless anti-theft device.

2. The wireless anti-theft device as claimed in claim 1, wherein said Manchester anti-theft code generated by said anti-theft coding and CPU circuit in said host has an interval between two sets of codes shorter than 100 ms.