Abstract: The objective of this invention is to provide an ultrasonic-wave transmitter/receiver fish-finder that stabilizes its balanced state while in water to transmit ultrasonic waves vertically downward, thus improving detection accuracy. The ultrasonic-wave transmitter/receiver 10 includes an ultrasonic transducer 21 that transmits and receives ultrasonic waves; a hanging-bell shaped case 50 that houses the ultrasonic transducer 21; and a cable 40 that suspends the case 50. A weight 81 is arranged above the ultrasonic transducer 21 provided at the bottom 54 of the case 50. In addition, the filler A1 is filled into the case 50 such that a cavity A2 is secured in the upper region of the case 50.

Abstract: The flasher-type multi-frequency fish finder includes a wideband ultrasonic transducer, a display-rotating disk, a motor and a control device. The plurality of display LEDs are composed of the first, second and third display LEDs. The control device has a signal-separating and obtaining part and a light-emission signal-producing part. The signal-separating and obtaining part separates the reflected signal and obtains the first reflected signal corresponding to the high frequency, the second reflected signal corresponding to the medium frequency, and the third reflected signal corresponding to the low frequency. The light-emission signal-producing part generates first, second and third light-emission signals based on the first, second and third reflection signals, respectively. The first, second and third annular-display regions are concentrically set on the display surface.

Abstract: The objective of this invention is to provide an ultrasonic-wave transmitter/receiver fish-finder that stabilizes its balanced state while in water to transmit ultrasonic waves vertically downward, thus improving detection accuracy. The ultrasonic-wave transmitter/receiver 10 includes an ultrasonic transducer 21 that transmits and receives ultrasonic waves; a hanging-bell shaped case 50 that houses the ultrasonic transducer 21; and a cable 40 that suspends the case 50. A weight 81 is arranged above the ultrasonic transducer 21 provided at the bottom 54 of the case 50. In addition, the filler A1 is filled into the case 50 such that a cavity A2 is secured in the upper region of the case 50.

Abstract: The objective of this invention is to provide an ultrasonic-wave transmitter/receiver with a fastening member that enables the case of such transmitter/receiver to be fastened reliably without impairing the usability of such transmitter/receiver during normal use. The ultrasonic-wave transmitter/receiver 10 comprises an ultrasonic transducer that transmits and receives ultrasonic waves; a case 50 that houses the ultrasonic transducer; and a cable 40 that suspends the case 50. The case 50 is of a hanging-bell shape comprising a lower-half part 51 having a bottom surface 52 and an outer-peripheral surface 53; and an upper-half part 61 having a structure of which the outer diameter gradually decreases toward the upper end. At least the lower-half part 51 of the case 50 is made of an elastic body. The groove 57 extending in the circumferential direction of the lower-half part 51 is formed on the outer-peripheral surface 53 of the lower-half part 51.

Abstract: A fishfinder in which signal transmission is conducted between a reception antenna formed on a display rotation plate and a transmission antenna formed on a connection plate, both the reception antenna and the transmission antenna being opposed each other, and electric power transmission is conducted between a pair of inductive coupling coils, one being formed on the display rotation plate and the other being formed on the connection plate so as to oppose each other.

Abstract: A flasher type fish sonar includes a front case in which a display window is formed in front, a rotary disc opposite to the display window rotated by a motor, an ultrasonic transducer for transmitting ultrasonic waves in the water by a control portion and for receiving reflected signals in the water, a display signal transmitting portion for transmitting reflected signals received by the ultrasonic transducer and display data forming formed by the control portion and for transmitting the same to the rotary disc, a display control portion attached to the rotary disc, a fish sonar display portion displayed by light emitting diodes attached near an edge of the rotary disc, and a letter illustration numeral display portion displayed by light emitting diodes inside of center portion of the rotary disc.

Abstract: A flasher type fish sonar includes a front case in which a display window is formed in front, a rotary disc opposite to the display window rotated by a motor, an ultrasonic transducer for transmitting ultrasonic waves in the water by a control portion and for receiving reflected signals in the water, a display signal transmitting portion for transmitting reflected signals received by the ultrasonic transducer and display data forming formed by the control portion and for transmitting the same to the rotary disc, a display control portion attached to the rotary disc, a fish sonar display portion displayed by light emitting diodes attached near an edge of the rotary disc, and a letter illustration numeral display portion displayed by light emitting diodes inside of center portion of the rotary disc.

Abstract: A flasher type fish sonar includes a front case with a transparent display window, a signal transmitting element at a center thereof, a connecting base board having a first timing detecting portion mounted thereto, a signal receiving element mounted opposite the signal transmitting element, a receiving coil mounted at a periphery of the signal receiving element, a display LED attached opposite the display window, a display rotary disc having a second timing detecting portion mounted opposite the first timing detecting portion and near the display LED, an electric power transmitting coil mounted to the connecting base board opposite the receiving coil, a main base board fixed to the connecting base board and a motor on the main base board for rotating the display rotary disc, such that a a water surface, reflected echos of fishes and a water bottom of the sea are displayed in the display window.

Abstract: A fish type sonar includes a signal transmitting portion having an output connected to an A/D converter, a timing generating portion having an output connected to the signal transmitting portion and the A/D converter, the A/D converter having an output connected to a first buffer memory, the first buffer memory having an output connected to a display signal transmitting portion and a sea bottom detecting portion, the sea bottom detecting portion having an output connected to a display data forming portion, the display data forming portion having an output connected to a second buffer memory, the second buffer memory having an output connected to the display signal transmitting portion, the display signal transmitting portion having an output connected to the display portion of the fish sonar and the portion for displaying the letters, the sea surface, the fish and the sea bottom.