Title:
KEYLESS ENTRY SYSTEM FOR VEHICLE AND ITS ADDITIONAL UNIT
Document Type and Number:
Japanese Patent JP3546428
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To surely transmits a prescribed detection signal from plural installed transmission antennas.
SOLUTION: An input part 170 of an additional unit for adding the transmission antenna 6 is connected to a base system transmitting a first detection signal in non-contact state. An amount of charge of a capacitor C1 is 0 when a second detection signal is not transmitted from the transmission antenna 6. When the input part 170 detects the transmission of the first detection signal, transistors Tr1, Tr2 are operated, whereby the electric energy charged to a capacitor C2 in the former power supply is supplied to an amplifier AMP2 in the initial stage of the detection, and the transmission of the second detection signal corresponding to the first detection signal is started.
Inventors:
Hideyuki Okada
Application Number:
JP2001145278A
Publication Date:
July 28, 2004
Filing Date:
May 15, 2001
Export Citation:
Assignee:
Mazda Corporation Inc
International Classes:
B60R25/01; B60R25/10; B60R25/24; B60R25/40; E05B83/36; E05B49/00; H04B5/02; H04B7/26; H04Q9/00; H04W4/04; H04W52/00; (IPC1-7): E05B49/00; B60R25/00; H04B5/02; H04B7/26; H04Q9/00
Domestic Patent References:
| JP813874A |
Attorney, Agent or Firm:
Yasunori Otsuka
Shiro Takayanagi
Yasuhiro Otsuka
Shuji Kimura
Shiro Takayanagi
Yasuhiro Otsuka
Shuji Kimura