| 摘要 |
An ultrasonic wave transmitting and receiving apparatus includes a control pulse generator for sequentially generating control pulses from its output terminals with a cyclically varied delay time. The control pulses are controlled in such a delay time relation as to enable the beams of ultrasonic waves to be deflected in left and right directions. The output pulse signals of deflection control units are controlled in such a delay time relation as to permit the beams of ultrasonic waves to be brought into focus by electron focussing control units. By the output pulses of the electron focussing control units, drive pulse generators are driven to supply drive pulses to electroacoustic conversion elements for generating the above-mentioned beams of ultrasonic waves. Some of the ultrasonic waves radiated in a medium is reflected at a boundary between two objects different in physical property (acoustic impedance) from each other and converted through the electroacoustic conversion elements to electric signals. The reflection wave signals so converted are sequentially stored in memory units, the contents of which are read out in response to the output pulse signals of the electronic focussing control units. The readout signals are, after being added together, supplied to a cathode ray tube.
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