Detection device, detection system and detection method of radio wave transmitting/receiving body

Patent metadata

Field	Value
Publication number	US-9432953-B2
Application number	US-201213346866-A
Country	US
Kind code	B2
Filing date	Jan 10, 2012
Priority date	Jan 13, 2011
Publication date	Aug 30, 2016
Grant date	Aug 30, 2016

Abstract

A detection device that detects existence of a radio wave transmitting/receiving body inside a specific space has a first antenna, a second antenna, a controller that controls a first detection signal and a second detection signal that the first antenna transmits to an inside of the specific space, and a disturbing signal that the second antenna transmits, a third antenna that receives a response signal transmitted to the first detection signal and the second detection signal, which have been received by the radio wave transmitting/receiving body, and a determination unit that determines an existence position of the radio wave transmitting/receiving body, based on the response signal received by the third antenna.

First claim

What is claimed is:

1. A detection device that detects existence of a radio wave transmitting/receiving body inside a specific space, comprising:
a first antenna;
a second antenna;
a controller that controls a first detection signal and a second detection signal that the first antenna transmits to an inside of the specific space, and a disturbing signal that the second antenna transmits;
a third antenna that receives a response signal transmitted in response to the first detection signal and the second detection signal, which have been received by the radio wave transmitting/receiving body; and
a determination unit that determines an existence position of the radio wave transmitting/receiving body, based on the response signal received by the third antenna;
wherein, when the specific space is detected as a closed space, the controller performs control so that the second detection signal and the disturbing signal that cancels the second detection signal are simultaneously transmitted at different timing from timing of the transmission of the first detection signal, and
wherein, when the third antenna receives the response signal to one of the first detection signal and the second detection signal, the determination unit determines that the radio wave transmitting/receiving body exists inside the specific space.

2. The detection device according to claim 1 , wherein by adjusting strengths of the first detection signal and the second detection signal, the controller performs the control so that the first antenna transmits the first detection signal with a first signal strength, and the second detection signal with a second signal strength higher than the first signal strength.

3. The detection device according to claim 2 , wherein
the controller controls the first signal strength so that the radio wave transmitting/receiving body existing in a first space outside the specific space at a predetermined distance or more from the specific space does not sense the first detection signal, and so that the radio wave transmitting/receiving body existing in a second space inside the specific space where the disturbing signal is sensed senses the first detection signal, and
the controller controls the second signal strength so that the radio wave transmitting/receiving body existing in the first space outside the specific space where the disturbing signal is not sensed does not sense the second detection signal, and so that the radio wave transmitting/receiving body existing in a second space inside the specific space where the first detection signal is not sensed senses the second detection signal.

4. The detection device according to claim 3 , wherein by further adjusting a strength of the disturbing signal, the controller performs the control so that the radio wave transmitting/receiving body existing in the second space inside the specific space where the first detection signal is not sensed does not sense the disturbing signal.

5. The detection device according to claim 1 , wherein
the specific space is an internal space of a trunk of a vehicle;
the radio wave transmitting/receiving body is a portable machine to open and close the trunk; and
the specific space becomes the closed space when the trunk is closed.

6. The detection device according to claim 5 , wherein
the second antenna is attached to a rear bumper outside the vehicle;
the first antenna is attached anterior to the rear bumper;
a position of the second space inside the specific space where the radio wave transmitting/receiving body does not sense the first detection signal is laterally both side corners and a bottom vicinity of the trunk; and
a position of the second space inside the specific space where the radio wave transmitting/receiving body senses the disturbing signal is substantially at the same height as a height from a bottom of the trunk of a gap between a vehicle body of the vehicle and a lid of the trunk, and not laterally both side corners of the trunk.

7. The detection device according to claim 1 , wherein the first antenna and the third antenna are made of one antenna.

8. A detection method for detecting existence of a radio wave transmitting/receiving body inside a specific space, comprising:
detecting that the specific space has become a closed space;
transmitting a first detection signal and a second detection signal at different timing by a first antenna, and transmitting a disturbing signal that cancels a part of the second detection signal simultaneously with the second detection signal by a second antenna; and
determining that the radio wave transmitting/receiving body exists inside the specific space, when a response signal that the radio wave transmitting/receiving body having a specific identification code sends back in response to one of the first detection signal and the second detection signal is received.

9. The detection method according to claim 8 , wherein in the transmitting the first detection signal and the second detection signal the second detection signal is transmitted after the first detection signal is transmitted.

10. The detection method according to claim 8 , wherein in the transmitting the first detection signal and the second detection signal, the first detection signal is transmitted after the second detection signal is transmitted.

11. The detection method according to claim 8 , wherein
the first detection signal is a signal that the radio wave transmitting/receiving body in one space inside the specific space senses, and that the radio wave transmitting/receiving body in another space does not sense;
the second detection signal is a signal that the radio wave transmitting/receiving body existing inside the specific space senses.

12. The detection method according to claim 9 , further comprising:
an intermediate determination step of determining whether or not the radio wave transmitting/receiving body exists inside the specific space between the step of transmitting the first detection signal and the step of transmitting the second detection signal;
wherein the intermediate determination step comprises determining that the radio wave transmitting/receiving body exists inside the specific space when a response signal that the radio wave transmitting/receiving body sends back is received, and the subsequent steps are not performed.

13. A detection system comprising a radio wave transmitting/receiving body having a specific identification code, and a detection device that detects existence of the radio wave transmitting/receiving body inside a specific space:
the detection device comprising:
a first antenna;
a second antenna;
a controller that controls a first detection signal and a second detection signal that the first antenna transmits, and a disturbing signal that the second antenna transmits;
a third antenna that receives a response signal transmitted by the radio wave transmitting/receiving body; and
a determination unit that determines an existence position of the radio wave transmitting/receiving body, based on the response signal received by the third antenna;

the radio wave transmitting/receiving body comprising:
a reception unit that receives the first detection signal and the second detection signal; and
a transmission unit that transmits the response signal in response to the received first detection signal and second detection signal, wherein,
when the specific space becomes a closed space, the controller performs control so that the second detection signal and the disturbing signal that cancels the second detection signal are simultaneously transmitted at different timing from timing of the transmission

Assignees

• Nishiguchi Tadao
• Omron Automotive Electronics

Inventors

• Nishiguchi Tadao

Classifications

• B60R25/245

  where the antenna reception area plays a role · CPC title

• H04B17/27

  for locating or positioning the transmitter · CPC title

• G07C2209/63

  Comprising locating means for detecting the position of the data carrier, i.e. within the vehicle or within a certain distance from the vehicle · CPC title

• H04W52/283 Primary

  Power depending on the position of the mobile · CPC title

• E05B49/00

  Electric permutation locks; Circuits therefor {; Mechanical aspects of electronic locks; Mechanical keys therefor (arrangements for sensing or reading record carriers G06K7/00; mechanisms including electronic locks actuated by nonmechanical keys such as passive and active electrical keys and other data carriers G07C9/00, G07F7/00; electronic switching H03K17/00)} · CPC title