| 摘要 |
PURPOSE:To obtain a fish finder featuring an extremely high efficiency by having the color recording via the heat-sensitive recording paper. CONSTITUTION:The ultrasonic waves are radiated from 1st and 2nd transmitters/ receivers 1 and 1' via the output signals transmitted from 1st and 2nd transmitters 2 and 2'. The reflected waves from the seawater are received by each transmitter/ receiver and then amplified at 1st and 2nd receivers 3 and 3' to be supplied to recording needle 5 of recorder 4. The input voltage is set up in accordance with the coloring of heat-sensitive recording paper 6 with coating of the heat-sensitive material which gives the red and blue colors by the high and low temperatures respectively. In case the output is delivered only from the 1st and 2nd receivers, the red and blue color recording is secured on recording paper 6. As a result, a wide range of the sea can be recorded on just one sheet of the recording paper. |
