JPH0443827Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to an electroacoustic transducer for a fish finder that allows observation of the sea or water within a relatively short range from the operator on land or on a ship. It is.

[Conventional technology]

Conventional fish finders, as shown in Figure 2,
A transducer c is attached to the bottom of the hull a of a motor boat or a fishing boat, or to the rear of the hull a, and the fish finder body b is mounted on the boat separately from the transducer c, and the fish finder body b is operated by a human. was.

[Problem that the invention attempts to solve]

However, conventional fish finders have the disadvantage that they require a large-scale equipment because they require a boat to be installed.

Furthermore, since fish finders are attached to the hull of a ship, they have the disadvantage that they cannot observe underwater areas close to land, which is inaccessible to the ship.

Therefore, the present invention aims to eliminate these drawbacks and provide an electroacoustic transducer for a fish finder that allows underwater observation within a short distance range from the operator.

[Means for solving problems]

In order to achieve the above object, this invention is based on a case 2 which has an equipment storage chamber 3 approximately in the center, a gas chamber 4 adjacent to the storage chamber 3, and a hook 5 on the outer wall surface. A vibrator 9 equipped with a piezoelectric element and a detection circuit 8 for detecting a minute voltage of the vibrator 9 are installed in the storage chamber 3, and a piezoelectric element and underwater vibration are vibrationally coupled in the storage chamber 3. The gas chamber 4 includes a center part 1 containing air 10, and a detection circuit of the sensor part 1. 8 via a cable 12, and a rod 13 to which a part of the cable 12 is attached.

[Effect]

Underwater vibrations are transmitted to a vibrator 9 equipped with a piezoelectric element, the minute voltage of the vibrator 9 is input to a detection circuit 8, and the output power of this detection circuit 8 is input to a control device 14 via a cable 12. .

Further, the sensor unit 1 can be set at a predetermined underwater position by casting a long distance with a fishing rod 13 from land 15 or aboard a boat, or by hand.
6.

Further, the output from the detection circuit 8 is transmitted to the control device 14.
The fish shadow etc. are displayed on the display section 14.
b.

〔Example〕

An embodiment of the present invention will be described based on FIG.

A detection circuit 8 having a vibrator 9 arranged in the storage chamber 3 connects the rotation axis 6 of the gimbal mechanism A to the case 2.
It is attached and fixed to the inner gimbal shaft 7 of the gimbal attached to the gimbal, or it is hung and fixed with a string-like object without using this gimbal mechanism.

The substance 11 stored in the storage chamber 3 may be any material as long as it has an appropriate viscosity to protect the stored equipment from external shocks and does not alter the quality of the stored equipment. But that's fine.

Furthermore, instead of providing the gas chamber 4 in the case 2 as shown in FIG. 1, the gas chamber 4 may be a buoyancy device made of a material having a specific gravity of 1 or less.

In addition to air, the gas chamber 4 uses a gas equivalent to air.

Note that the pendulum element 9 is made of, for example, PZT, BaTiO ₃ ,
A piezoelectric element such as BLT is used.

Further, the hook portion 5 may be provided with a hole to which the fishing line 5a is attached, or may be formed in the shape of a hook.

[Effect of idea]

According to the present invention having the above structure, since the sensor section itself floats on the water surface due to buoyancy, there is no need to attach the sensor section to the bottom or rear of the hull as in the conventional case, and it can be installed underwater with a simple operation.

In addition, the sensor section can be placed in the water in the same way as a general cast-type fishing rod, and in addition, the operator can observe underwater fish shadows and water bottom conditions at a close distance.

Furthermore, you can fish efficiently while observing fish shadows and the bottom of the water.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of an apparatus according to the present invention. FIG. 2 is an explanatory diagram showing a conventional example. DESCRIPTION OF SYMBOLS 1... Sensor part, 2... Case, 3... Storage chamber, 4... Gas chamber, 5... Hook part, 8... Detection circuit, 9... Vibrator, 12... Cable, 13...
Rod, 14...control device.

Claims (1)

[Scope of utility model registration request] A vibrator equipped with a piezoelectric element in the storage chamber of a case that has a storage chamber for equipment approximately in the center, a gas chamber adjacent to the storage chamber, and a hook on the outer wall surface, and a microscopic vibrator of the vibrator. In addition to being equipped with a detection circuit that detects voltage, the storage chamber has a sealed structure by storing a substance of appropriate viscosity such as silicone oil that serves as a medium for vibrationally coupling the piezoelectric element and underwater vibration and that does not alter the quality of the stored equipment, An electroacoustic system for fish finders, which comprises a sensor section containing air in the gas chamber, a control device connected to a detection circuit of the sensor section via a cable, and a rod to which a part of the cable is attached. conversion device.