JPS5951200B2 - Vibration generator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Conventional vibration generators use electrostrictive materials, magnetostrictive materials, etc., and apply a changing electric field or magnetic field to the materials to cause vibrations, but these vibrators are extremely expensive.

The present invention provides a vibration generating device that uses a magnetic fluid and can easily generate vibration and propagate the vibration by applying a changing magnetic field to the magnetic fluid.

As is well known, a magnetic fluid is a colloidal solution in which fine ferromagnetic powder such as magnetite is stably dispersed in a liquid phase, and is a solution that does not undergo agglomeration or solid-liquid separation due to a magnetic field.

Therefore, when a changing magnetic field is applied to this, the magnetic powder in the liquid vibrates, causing the entire liquid to vibrate and generate liquid vibration.

The vibration can be easily controlled to any desired frequency by changing the frequency of the magnetic field.

FIG. 1 shows an embodiment of the present invention, in which 1 is a magnetic core that applies a magnetic field, 2 is an excitation coil, and a high-frequency power source 3 causes an excitation current to flow through this.

4 is a magnetic fluid inserted between the magnetic poles, and is surrounded by an elastic bag 5 made of rubber or the like.

6 is a vibration propagation medium liquid in contact with the magnetic fluid.

Various liquid media are used for the magnetic fluid 4, but for example, a magnetic fluid with a saturation magnetization (Ms) of approximately 200 to 300 G is used by dispersing Fe3O4 particles of about 70 to 100 particles in kerosene oil. was inserted into the magnetic gap, a changing magnetic field was applied, the generated vibrations were propagated through water, and when received by inserting a crystal in the water, it was confirmed that vibrations were generated up to a frequency of approximately 45 kHz.

In the experiment, stearic acid was also used as the medium liquid, but it was confirmed that vibrations could be generated in the same way.

FIG. 2 shows an example in which liquid vibrations of a magnetic fluid are used in a speaker, in which a vibration transmitting rod 7 is inserted into the magnetic fluid 4, and a speaker cone is attached to the tip of the rod 7 to cause vibration.

By inputting a signal to the coil 2, the speaker can be easily vibrated to produce sound.

Of course, this liquid vibration of the magnetic liquid can be used as a source of vibration for various cleaning, polishing, and other purposes.

As described above, the vibration generator of the present invention uses magnetic fluid and applies a changing magnetic field to generate liquid vibrations, so it can easily generate vibrations of any frequency, has a simple structure, and is inexpensive. Vibration generators can be provided to

[Brief explanation of the drawing]

FIG. 1 shows one embodiment of the present invention, and FIG. 2 shows another embodiment. 1 is a magnetic iron core, 2 is an excitation coil, 3 is an excitation power source, 4 is a magnetic fluid, 5 is an elastic bag, 6 is a vibration propagation liquid medium, and 7 is a vibration transmission rod.

Claims (1)

[Claims] 1. A magnetic device that applies a changing magnetic field, a magnetic fluid inserted into the magnetic field action gap of the magnetic device, an elastic bag that encloses the magnetic fluid, and a vibration that propagates the vibration of the magnetic fluid directly or through the elastic bag. A vibration generator consisting of a propagating body.