Communications: electrical – Condition responsive indicating system – With particular coupling link
Patent
1985-07-19
1987-06-16
Rowland, James L.
Communications: electrical
Condition responsive indicating system
With particular coupling link
180287, 307 10AT, 340 51, 340 63, 340 64, 340991, G08G 112
Patent
active
046739211
ABSTRACT:
A car-locating system comprises a portable transmitter-receiver unit and a car-mounted transmitter-receiver unit. The portable unit includes a switch, a first directional antenna, a first transmission section, a receiving section and a receipt level display. When it is closed, the switch generates a car-locating instruction. In response to this instruction, the first transmission section transmits a transmitting code through the directional antenna. Any signal received by the directional antenna is demodulated by the receiving section into a response code. The response code is compared with a first prescribed response code. When it is identical with the first prescribed response code, the receiving signal level is displayed by the receipt level display. The car-mounted unit includes a non-directional antenna, a second transmission section and a timer. The non-directional antenna receives the code transmitted from the portable unit. The code contained in the transmitted signal is compared with a transmitting code set in the car mounted unit. When it is identical with the transmitting code, the second transmission section is operated for the period of time set in the timer, thus transmitting a response signal containing a response code through the non-directional antenna.
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Hayakawa Shoichi
Saito Muneo
Nippondenso Co. Ltd.
Rowland James L.
Swarthout Brent A.
Toyota Jidosha & Kabushiki Kaisha
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