JPH0432105Y2 - - Google Patents

Description

[Detailed description of the invention] "Industrial application field" This invention continuously switches the rotation of the output shaft of an ultrasonic motor between forward and reverse directions to generate vibrations in the inertia plate and diaphragm attached to the output shaft. Regarding the vibrator.

"Prior Art" Recently, it has been reported that applying vibration to a part of the human body is effective for various treatments.

Conventional therapeutic vibration devices have attached an eccentric weight to a normal motor that uses magnetic force, or vibrated a diaphragm via a cam mechanism.

Also known is one in which a frequency vibrator is used to vibrate gas, and the vibration causes a diaphragm to vibrate.

``Problems that the invention is trying to solve'' Among conventional vibration devices, those that use a normal motor are large devices that are long in the direction of the motor's rotational axis, and they also have a problem with vibration relative to the input energy. The problem was that the output energy was small and the energy efficiency was poor. Furthermore, the air vibrating type requires a large power source to obtain sufficient vibrating force, resulting in problems such as an increase in the size of the device and poor energy efficiency.

Therefore, the present invention utilizes the ultrasonic motor disclosed in Japanese Patent Application Laid-open No. 58-148682 or Japanese Utility Model Application No. 63-120592 (same inventor as the inventor of the present invention).
The purpose is to provide a small and energy efficient vibrator.

"Means for solving the problem" This invention attaches an inertial body to the output shaft of an ultrasonic motor, and also provides a diaphragm whose center part is fixed to the output shaft and whose outer part is fixed to the case of the ultrasonic motor. It's a vibrator.

The back side of the diaphragm is in contact with the inertia plate,
The vibrations are transmitted to the diaphragm. In addition, an elastic body that can be elastically deformed is interposed between the output shaft, the inertia plate, and the diaphragm.
Made the vibrations louder.

The ultrasonic motor is connected to a drive circuit that enables forward and reverse rotation, and the drive circuit is configured to be continuously switched to an output corresponding to forward and reverse rotation by a switching control circuit.

"Operation" When the ultrasonic motor is rotated continuously by switching between forward and reverse directions by the switching control circuit, the inertia plate is suddenly rotated in the reverse direction, and as the reverse rotation is repeated,
The inertia plate vibrates. Further, since the diaphragm has its center portion fixed to the output shaft side and its outer peripheral portion fixed to the case side of the ultrasonic motor, the diaphragm also generates vibrations due to forward and reverse rotation of the output shaft.

Furthermore, by providing an elastic body between the output shaft, the inertia disk, and the diaphragm, vibrations of the inertia disk and the diaphragm are amplified. Furthermore, since the inertia disk is attached to the output shaft via an elastic body, the elastic disk has a degree of freedom to tilt slightly with respect to the axis of the output shaft. Even if it acts biasedly,
Following this, the diaphragm can be appropriately brought into contact with the treatment area.

"Example" An embodiment of the present invention will be explained with reference to FIGS. 1 and 2.

A cylindrical mounting bracket 3 is fitted onto the output shaft 2 of the ultrasonic motor 1 and fixed with screws, and a cylindrical elastic body 4 made of rubber, synthetic resin, etc. is fitted around the outer periphery of the mounting bracket 3. Fixed by adhesive or vulcanization. An inertia disk 5 is fixed to the outer circumference of the elastic body 4 by adhesive or vulcanization, and the center of a diaphragm 6 that covers the outer surface of the inertia disk 5 is the output shaft 2, and the outer circumference is the case of the ultrasonic motor 1. It is fixed to via the holding plate 7. Note that the elastic body 4
is used to amplify the vibrations of the inertia plate 5 and the diaphragm 6 due to its elastically deformable property, and also to allow the inertia plate 5 to tilt slightly.
Further, in this embodiment, the elastic body 4 and the diaphragm 6 are integrally formed, and the center portion of the diaphragm 6 is fixed to the output shaft 2 via the elastic body 4.

Then, when the ultrasonic motor 1 is rotated in the forward and reverse directions by the ultrasonic motor drive circuit and switching control circuit, which will be described later, the inertia plate 5 is suddenly rotated in the reverse direction, causing vibration, and furthermore, the output shaft side and the case side Vibration also occurs in the diaphragm 6 fixed to both, and larger vibrations are obtained from both.

The inertia plate 5 is made of a somewhat heavy material such as metal, and the central cylindrical portion of the inertia plate 5 is strongly adhered to the elastic body 4 on a wide surface.

The diaphragm 6 is made of rubber or synthetic resin, and has a smooth spherical outer circumferential surface and a cross-sectional shape that contacts the inertial disk 5 on the inner circumferential side, so that the diaphragm 6 is held by the inertial disk 5, and
The vibrations of the inertia plate 5 are transmitted to the diaphragm 6. In addition, the diaphragm 6 and the inertia plate 5
The surfaces in contact with the elastic body 4 are separated from each other except for the part of the elastic body 4. Further, the outer peripheral part of the diaphragm 6 is formed thickly, and a groove for sandwiching the holding plate 7 is formed in the thick part, and an appropriate number of protrusions 8 are formed in the groove. The outer circumferential portion of the diaphragm 6 is fixed by being engaged with each recessed portion of the diaphragm 6 .

As is well known, the ultrasonic motor 1 has an electrode of a piezoelectric body (an electrostrictive body may be used) 9 divided into two poles 10 and 11, each of which receives a high frequency voltage with a 90° phase difference (1/2 wavelength difference). is applied to generate a traveling wave in the stator to which the piezoelectric body is attached. Although not shown in the drawings, a rotor is pressed into contact with the stator, and the rotor receives traveling waves generated in the stator to rotate, and further, an output shaft 2 connected to the rotor rotates.

As shown in FIG. 3, in the driving circuit of the ultrasonic motor 1, one electrode 10 of the piezoelectric body of the ultrasonic motor is connected to a high frequency voltage source 12 with a frequency of 40 kHz, for example, via an amplifier circuit 13, and the other electrode 11 is connected to the high frequency voltage source 12 via the amplifier circuit 13 and the phase conversion circuit 14. The phase conversion circuit 14 converts the phase of the high frequency voltage by +90° and inputs the converted voltage to the amplifier circuit 13.

The phase conversion circuit 14 also has an inverse phase conversion circuit that converts the phase of the high frequency voltage source from the high frequency voltage source 12 by -90°, and when this -90° phase converted high frequency voltage is applied to the electrode 7. The ultrasonic motor 1 is configured to rotate in the opposite direction to that when the phase is changed by +90°.

Further, the phase conversion circuit 14 receives the signal from the forward/reverse switching circuit 15 and performs +90° phase conversion and -90° phase conversion.
It is designed so that it can be switched to phase conversion. Further, the forward/reverse switching circuit 15 is configured to receive a pulse signal (for example, an oscillation frequency of 65 Hz) from the oscillator 16, and the forward/reverse switching circuit 15 performs +90° phase conversion and -90° phase conversion in accordance with the pulse signal. The output signal can be switched rapidly and continuously to the corresponding output signal.

In the above, a phase shift of ±90° was performed, but the invention is not limited to this value. Even if an arbitrary phase shift is performed, the ultrasonic motor 1 rotates forward and backward in the same way, and the inertia plate 5 and diaphragm 6 can be vibrated. Further, a phase control circuit may be provided in place of the forward/reverse switching circuit 15 and the oscillator 16, and the phase conversion circuit may be repeatedly switched from 90° phase conversion to 180° phase conversion. Furthermore, instead of changing the switching abruptly, for example, by switching in a sin curve shape,
It is possible to obtain vibrations with different waveforms from those described above, and furthermore, the rotation may be switched between forward and reverse rotation according to an arbitrary pulse signal.

The phase conversion circuit 14 can adjust the switching period by the frequency adjustment circuit 17, and the frequency adjustment circuit 17 is configured to receive a signal corresponding to the driving state of the ultrasonic motor 1 from the speed adjustment circuit 18. It's summery.

Further details of the drive circuit for the ultrasonic motor 1 are shown in FIG. From the high frequency voltage source 12
A voltage of 6V is input to the phase conversion circuit 10, the frequency adjustment circuit 17, and the speed adjustment circuit 18. The phase conversion circuit 14 alternately outputs a +90° phase-converted high-frequency voltage and a -90° phase-converted high-frequency voltage, which are outputted via the amplifier circuit 13 to the electrodes 10 and 11 of the ultrasonic motor at ±90°. A sine wave high frequency voltage and a cosine wave high frequency voltage with a phase difference are applied. Further, the speed adjustment circuit 18 receives a voltage change generated in accordance with the traveling wave of the ultrasonic motor 1 as input, and furthermore, the input signal can be adjusted with a variable volume 19.

Although the ultrasonic motor in the above embodiment was of the traveling wave type, a traveling wave type may also be used.In that case, a drive circuit for rotating the ultrasonic motor in forward and reverse directions is provided, and a switching control circuit is provided. Therefore, the drive circuit may be continuously switched so that the output corresponds to forward and reverse rotation.

"Effect of the invention" The vibrator of the invention can vibrate the inertia plate and the diaphragm by continuously switching the ultrasonic motor between forward and reverse rotations, and stronger vibrations can be obtained by the vibration of both. Energy efficient. In addition, since the inertia plate is connected to the output shaft of the ultrasonic motor via an elastic body, the inertia plate can tilt slightly even if a biased force is applied to the inertia body through the diaphragm on the outer surface. When used in a vibration therapy device, the diaphragm of the vibrator always makes appropriate contact with the patient. Furthermore, by interposing an elastic body between the output shaft of the ultrasonic motor and the inertia disk and diaphragm, it is possible to generate large vibrations in the inertia disk and diaphragm. It becomes difficult to communicate.

[Brief explanation of the drawing]

Figure 1 is a sectional view of the vibrator of the present invention, Figure 2 is a cross-sectional view of the vibrator of the present invention;
The figure is a plan view of the diaphragm side of the vibrator, FIG. 3 is a block diagram of the drive circuit of the ultrasonic motor, and FIG. 4 is a diagram of the drive circuit of the ultrasonic motor. 1... Ultrasonic motor, 2... Output shaft, 4... Elastic body, 5... Inertia plate, 6... Diaphragm, 7...
...Holding plate, 14... Phase conversion circuit, 15... Forward/reverse switching circuit.

Claims (1)

[Claims for Utility Model Registration] (1) Provided with a drive circuit that rotates the ultrasonic motor in forward and reverse directions, and a switching control circuit that continuously switches the output from the drive circuit to one corresponding to forward and reverse rotation; A vibrator characterized in that an inertia plate is attached to the output shaft of an ultrasonic motor, and a diaphragm is provided whose center part is fixed to the output shaft and whose outer peripheral part is fixed to the case of the ultrasonic motor. (2) The vibrator according to claim 1 of the utility model registration, characterized in that an elastic body is interposed between the output shaft of the ultrasonic motor, the inertia plate, and the diaphragm. (3) The vibrator according to claims 1 and 2 of the utility model registration, characterized in that the back side of the diaphragm is in contact with an inertia plate.