Title:
ULTRASONIC SENSOR
Document Type and Number:
Japanese Patent JP3149802
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To improve a distance resolution without increasing memory and detect an intruder positively by comparing a row of compression data of a row of data detected by an ultrasonic wave and its partial row of data and then a row of compression data when no intruder exists in a monitoring space and its partial row of data.
SOLUTION: An ultrasonic wave transmission part 4a transmits an ultrasonic wave S4 at each specific time, an ultrasonic wave reception part 4b receives an ultrasonic wave S5, and a writing part 8 compresses a row of data and writes detection compression data into a detection compression data storage part 7b. In that case, when an intruder exists in a monitoring space, a distance between an ultrasonic sensor and an object for reflecting the ultrasonic wave S4 becomes shorter. A comparison part 9 reads a row of background compression data that is stored in a background compression data storage part 7a with a row of detection compression data stored in a detection compression data storage part 7b and compares both successively from data being stored at the start of the memory. The comparison part 9 judges that there is an intruding object in the monitoring space if both differ.
Inventors:
Toshimasa Takagi
Mabu Uno
Goro Oda
Mabu Uno
Goro Oda
Application Number:
JP31634696A
Publication Date:
March 26, 2001
Filing Date:
November 27, 1996
Export Citation:
Assignee:
MATSUSHITA ELECTRIC WORKS,LTD.
International Classes:
G01V1/00; G01S7/526; G01S15/04; G08B13/16; (IPC1-7): G01S15/04; G01S7/526; G01V1/00; G08B13/16
Domestic Patent References:
| JP6201826A | ||||
| JP8506656A |
Other References:
【文献】特許3057395(JP,B2)
Attorney, Agent or Firm:
Junji Ando (1 person outside)