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Obstacle detecting apparatus using ultrasonic waves
| Details |
Inventors: Satake, Kanje; Shimazu, Yasuo; Kasahara, Masaru; Adachi, Seya;
Assignee:
Primary Examiner: Farley; Richard A.
Assistant Examiner:
Attorney, Agent or Firm: Striker; Michael J.
The present invention relates to an obstacle detecting apparatus using ultrasonic waves, wherein an ultrasonic transmitter-receiver and an ultrasonic receiver are provided at a desired interval, and thereby the distance and the direction to the obstacle are obtained by the intersecting point between the circular locus of the first reflected wave returning after reflection at the obstacle, and the elliptical locus of the second reflected wave to the ultrasonic receiver. Under this structure, when any person or any obstacle like a building exists within the dead angle of a motor vehicle in case a driver is going to back it, the driver is informed of the distance and the direction to the obstacle by means of the obstacle detecting apparatus using ultrasonic waves. |
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DETAILED DESCRIPTION Accordingly, it is the primary object of this invention to provide an obstacle detecting apparatus using ultrasonic waves, wherein an ultrasonic transmitter-receiver and an ultrasonic receiver are provided at a desired interval, and thereby the distance and direction to the obstacle are obtained by the intersecting point between the circular locus of the first reflected wave returning after reflection at the obstacle and the elliptical locus of the second reflected wave to the ultrasonic receiver.
Under this structure, when any person or any obstacle like a building exists within the dead angle of a motor vehicle in case a driver is going to back it, the driver is informed of the distance and the direction to the obstacle by means of the obstacle detecting apparatus using ultrasonic waves.
It is another object of this invention to provide an obstacle detecting apparatus using ultrasonic waves, wherein one time measuring enables to detect accurately the position of the obstacle so that ultrasonic waves are not transmitted and received mechanically.
It is another object of this invention to provide an obstacle detecting apparatus using ultrasonic waves, wherein the position of the obstacle can be indicated accurately by a preferred polar coordinate display unit.
It is another object of this invention to provide a polar coordinate type display unit, wherein out of a plurality of input signals a part of them is indicated by a deflection angle indicator, while the other part of them by a radius vector indicator, and a plurality of signals are indicated in relation with the quantity of signals so as to be indicated simultaneously and by the form of polar coordinate.
It is still another object of this invention to provide a polar coordinate type display unit, wherein a plurality of input signal quantity can be indicated on the same indicator in relation with each other, thereby the condition of input signals being visible at a glance.
Other and further objects, features and advantages of this invention will be apparent from the following description taken in connection with the accompanying drawings
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