The present invention is directed to a mounting device for a fish finding apparatus and, more particularly, to a motorized mounting device which includes an adjustable length pole used to mount a sonar transducer or other device an angler may be interested in mounting to the end of the pole that enters the water. The pole is used to spin the transducer or other apparatus in a clockwise and counterclockwise direction with a switch that is adapted to be operated by the angler's foot or a wireless remote. The mounting device is configured to be secured to a boat or mounted on a boat troll motor whereby the adjustable pole is secured and spins independent of the troll motor shaft.

A detection probe, a transmission device, and a detection instrument. The detection probe includes a housing defining a receiving space, a detection mechanism disposed on an end of the housing and configured to perform a detection function, a drive mechanism disposed in the receiving space and configured to output power, a rope transmission mechanism disposed in the receiving space and including a rope connected to the driving mechanism and the detection mechanism respectively and a reversing assembly including at least two reversing pulley groups arranged along an extension path of the rope, and a gear transmission mechanism disposed in the receiving space and connected to the driving mechanism and the rope transmission mechanism respectively, so as to receive the power output by the driving mechanism and transmit the power to the rope transmission mechanism.

Disclosed is an ultrasonic probe including a transducer array connected to a rotation shaft, a motor provided to rotate the transducer array around the rotation shaft, a printed circuit board provided to output a driving signal for driving the transducer array, and a flexible printed circuit board electrically connected to the printed circuit board to transmit the driving signal to the transducer array, wherein the flexible printed circuit board includes an array terminal electrically connected to the transducer array, a first terminal electrically connected to one portion of the printed circuit board, a first connection part connecting the array terminal and the first terminal, a second terminal electrically connected to the other portion of the printed circuit board, and a second connection part connecting the array terminal and the second terminal, and wherein the first connection part and the second connection part are overlapped with each other and wound around the rotation shaft.

An underwater detection device includes a transmitter, a receiver, an actuator, a controller, and a signal processor. The transmitter transmits a transmission wave. The receiver receives a reflection wave of the transmission wave. The actuator rotates the transmitter and the receiver in a mutually synchronized fashion. The controller makes the transmitter transmit a plurality of transmission waves at mutually different frequencies in order, for every given unit rotation angle. The signal processor generates an echo signal for indication in a direction of the unit rotation angle based on a reception signal at each of the frequencies acquired from a range of the unit rotation angle.