MASTER-SLAVE MUTUAL DANGER RECOGNITION TYPE ULTRASONIC TRANSMITTER-RECEIVER

MASTER-SLAVE MUTUAL DANGER RECOGNITION TYPE ULTRASONIC TRANSMITTER-RECEIVER

PROBLEM TO BE SOLVED: To actuate each alarm device of a master station in the case of a slave station being in a dangerous area while preventing the actuation of the alarm device in the case of confirming safety even at the time of the slave station being in the dangerous area. SOLUTION: A master st...

Ausführliche Beschreibung

Gespeichert in:
Bibliographische Detailangaben
Hauptverfasser: NAGAMINE KAORU, KUROSE MAMORU, TAKIGUCHI ISAO, ASAI HIDEAKI
Format: Patent
Sprache:eng
Schlagworte:
ANALOGOUS ARRANGEMENTS USING OTHER WAVES
DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES
LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION ORRERADIATION OF RADIO WAVES
MEASURING
PHYSICS
RADIO DIRECTION-FINDING
RADIO NAVIGATION
TESTING
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Beschreibung
Zusammenfassung:PROBLEM TO BE SOLVED: To actuate each alarm device of a master station in the case of a slave station being in a dangerous area while preventing the actuation of the alarm device in the case of confirming safety even at the time of the slave station being in the dangerous area. SOLUTION: A master station 3 is provided with transmitting and receiving sensors 31, 32 transmitting a first ultrasonic wave so as to cover a dangerous area and receiving a second ultrasonic wave of different frequency from first frequency, and an alarm device 34. A slave station 4 is provided with receiving and transmitting sensors 41, 42 receiving the first ultrasonic wave transmitted from the master station 3 and transmitting the second ultrasonic wave, and an alarm device 44, and transmits the second ultrasonic wave at the time of receiving the first ultrasonic wave. The master station 3 transmits a third ultrasonic wave in the case of discriminating the presence of the slave station 4 in the above-mentioned dangerous area from time difference between transmission of the first ultrasonic wave and receiving of the second ultrasonic wave. The slave station 4 is further provided with confirmation button switches 45, 46 for stopping transmission of the second ultrasonic wave from the transmit sensor 42.