The present invention relates to a fishfinder of flasher type. In particular, the present invention relates to a fishfinder of flasher type through which vibration and noise can be removed in use and fishfinding operation can be stably conducted for a long time.
A Display Window 31a is Disposed on a Front Case 31
Conventionally, it is proposed a fishfinder of flasher type as shown in
However, in the above conventional fishfinder, since electric power and display signals are transmitted through the brush 8 and the slip ring 7, large vibration and noise are produced and the brush 8 is worn by friction and broken, thereby fishfinding operation cannot be stably conducted for a long time.
The present invention has been made in taking above problems into consideration and has an object to provide a fishfinder in which electric power is supplied through a pair of a first inductive coupling coil and a second inductive coupling coil without use of the slip ring and the brush.
The present invention has another object to provide a fishfinder in which transmission and reception of various signals are conducted through a transmission antenna and a receiving antenna without use of the slip ring and the brush.
According to the above present invention, vibration and noise can be removed in use and fishfinding operation can be stably conducted for a long time.
In order to accomplish the above objects, according to one aspect of the present invention, it is provided a fishfinder of flasher type comprising:
a front case in which a transparent display window is formed;
a motor with a rotation shaft arranged on a main plate;
a display rotation plate fixed to the rotation shaft of the motor, the display rotation plate being disposed opposite to the display window;
a first inductive coupling coil formed around a rotation shaft part of the display rotation plate;
a second inductive coupling coil formed around a hole to insert the rotation shaft of the motor, the hole being formed in a connection plate;
a display LED fixed on the display rotation plate at a position opposite to the display window of the front case;
a reception antenna arranged on a circumference of the display rotation plate; and
a transmission antenna arranged on a circumference of the connection plate, the transmission antenna being opposite to the reception antenna on the display rotation plate.
A detailed description of a preferred embodiment of embodying the present invention will now be given referring to the accompanying drawings.
In the block diagram shown in
The reflection signals read out from the first buffer memory 17 are input to a sea bottom detection part 18 and signals indicating the sea bottom are detected. All reflection signals including the sea bottom signals are input to a display data production part 19. Further, character data signals from a display character data storing part 20 are input to the display data production part 19 and the above signals are stored in a second buffer memory 21. The signals read out from the second buffer memory 21 are mixed with oscillation signals from a local oscillator 23 in a mixer 22. Such signals are sent out from a transmission antenna 24 for signal transmission, and received by a reception antenna 25 disposed on a display rotation disc plate 34 so as to oppose to the transmission antenna 24. The transmission antenna 24 and the reception antenna 25 are formed from metallic material. Signals received by the reception antenna 25 is demodulated and amplified in a demodulation/amplification part 26 and input to a control part 28. Fishfinding signals input to the control part 28 are input to a fishfinding display part 29 and character signals are input to a character display part 30.
Further, as shown in
Opposite to the display rotation circular disc 34, a connection plate 35 is formed together with a main plate 36. A power reception coil 37 is provided around a center of the display rotation circular disc 34. The power reception coil 37 supplies power to a power part 39 of the display rotation circular disc 34. The power part 39 supplies power to the control part 28, the fish finding display part 29 and the character display part 30. Such power reception coil 37 is arranged so as to oppose to a power transmission coil 38 disposed on the connection plate 35. The power transmission coil 38 is connected to a power transmission part 38A shown in
In the fishfinder according to the embodiment of the present invention, the ultrasonic reflection signals emitted from the transducer 14 in water are temporarily stored in the first buffer memory 17, thereafter read out therefrom and the sea bottom is detected in the sea bottom detection part 18. The reflection signals and the character data stored in the display character data storing part 20 are formed into the display data in the display data production part 19, the display data being stored in the second buffer memory 21. Such display data are read out from the second buffer memory 21, based on the timing signal from the light reception element 36a. The display data are transmitted from the light transmission antenna 24 of the connection plate 35 to the reception antenna 25 arranged along the circumference of the display rotation circular disc 34, thereby the signals corresponding to extent of strength in the reflection signals are demodulated and amplified in the demodulation/amplification part 26 and thereafter are input to the LED 45 arranged on the display rotation circular disc 34. As a result, as shown in