Flasher type fish sonar
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United States of America Patent
Stats
-
Nov 18, 2003
Grant Date -
Dec 12, 2002
app pub date -
May 24, 2002
filing date -
Jun 6, 2001
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A flasher type fish sonar includes an ultrasonic vibrator transmitting and receiving ultrasonic waves in water, a transmitting circuit supplying oscillating signals to the ultrasonic vibrator, a receiving circuit amplifying reflected signals received by the ultrasonic vibrator, an A/D converter converting the reflected signals to digital signals, an input circuit receiving the digital signals from the A/D converter through a control circuit, a flasher display including a rotary disk having a rotated luminous body and a display board having a window displaying luminosity of the luminous body in response to the digital signals from the input circuit through brushes and slip rings, and a constant current circuit in the input circuit which eliminates changes of electric current flowing to the luminous body due to contact resistance between the slip rings and the brushes.
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