JPH0335315Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> This invention relates to a vibration generator used in an acoustic vibration device that generates vibrations that can be felt based on acoustic signals.

<Prior Art> Conventionally, a vibration generator for an acoustic vibration device as described above generates vibration by applying a voltage based on the level or sound range of an acoustic signal.
An example is shown in FIG. This vibration generator 31
A disc-shaped weight 3 is attached to the rotating shaft 35 of the DC motor 33.
4 is fixed, and the rotating shaft 35 of the DC motor 33 is attached at a position away from the center of gravity of the disc-shaped weight 34. When a DC voltage based on the level of the acoustic signal is applied to the DC motor 33 of this vibration generator 31, the DC motor 33 rotates at a rotation speed corresponding to the applied voltage, and the weight 3 fixed to the rotating shaft 35 rotates.
Rotate 4. By rotating the weight 34, vibration is applied to the rotating shaft 35.

This vibration generator 31 is installed, for example, inside a cylindrical body 32 and placed at the back of the chair, or at the joint between the back and the seat, and is supplied with a voltage based on the level of the acoustic signal, etc. Then, the vibration of the vibration generator 31 is transmitted to the cylindrical body 32, etc., so that the person sitting on the chair can experience the vibration.

<Problem to be solved by the invention> However, the above-mentioned vibration generator for acoustic vibration device 31
In this case, since the rotating shaft 35 of the DC motor 33 is fixed at a position away from the center of gravity of the disc-shaped weight 34, the direction in which the center of gravity of the weight 34 is rotated is nearly parallel to the direction of gravity. degree, and weight 34
The farther the center of gravity of the DC motor 33 is fixed from the center line of the rotating shaft 35, the greater the torque is required to start the DC motor 33, and the DC motor 33 may not start if the applied voltage is low. Therefore, even if the level or sound range of the acoustic signal changes from a state in which only a low voltage is applied to the DC motor 33 to a state in which a high voltage is rapidly applied, it takes time to start the DC motor 33, and the level or sound range of the sound signal changes. There is a problem in that vibrations that quickly respond to fluctuations are not generated.

This invention was developed in view of the above problems, and is an acoustic vibration device that promptly generates vibrations corresponding to the change in voltage applied to a DC motor from a low voltage to a high voltage. The purpose of this invention is to provide a vibration generator for

<Means for Solving the Problems> In order to achieve the above object, the vibration generator for acoustic equipment of this invention includes a DC motor, the base end is fixed to the rotating shaft of the DC motor, and the distal end is fixed to the rotating shaft of the DC motor. a guide portion formed to extend in a direction away from the center line of the shaft; and a guide portion provided on the guide portion so as to be slidable between the base end portion and the distal end portion along the guide portion;
a spring having one end fixed to the tip of the guide portion and the other end articulated or connected to the weight to press the weight toward the rotating shaft; When the rotation of the rotation shaft of the DC motor is stopped, the spring restrains the weight so that it is almost in contact with the rotation shaft, so that the rotation shaft rotates at a rotation speed corresponding to the voltage applied to the DC motor. A spring having a spring constant that restrains the weight at a position that balances the centrifugal force acting on the weight when rotating is provided.

<Operation> According to this invention, when the rotating shaft of the DC motor is stopped, the weight provided in the guide portion is restrained by the spring toward the center line of the rotating shaft. When the DC motor is driven to rotate in this state, since the moment of inertia of the weight is small, the applied voltage is lower than the voltage required to rotate the rotating shaft when the weight is located away from the center line of the rotating shaft. The rotation axis can be rotated. When the DC motor rotates and the weight rotates with the rotating shaft, the weight slides along the guide part in a direction away from the center line of the rotating shaft due to the centrifugal force, and the centrifugal force and the spring force is restrained at a position where it is balanced. Note that when a low voltage is applied to this DC motor and the generated output is small, the centrifugal force acting on the weight is small, so the weight is stopped and rotates at a position close to the center line of the rotating shaft, causing a low voltage on the rotating shaft. A force vibration with a low frequency is applied. Also,
If a voltage higher than the above low voltage is applied to the DC motor and the generated output is larger than the above case,
Since the centrifugal force acting on the weight is large, the weight is restrained from rotating at a position far from the center line of the rotating shaft, and high-frequency, large-force vibrations are applied to the rotating shaft.

<Example> A first example of this invention will be described with reference to FIGS. 1 and 2. FIG. 1 is a diagram showing a state in which this vibration generator 6 for an acoustic vibration device is fixed, for example, inside a cylindrical body 32, in which 1 is a DC motor, 3 is a guide part, 4 is a weight, and 5 is a spring. .

The DC motor 1 has a rotating shaft 35 inside a cylindrical body 32 whose inner diameter is slightly larger than the outer diameter of the DC motor 1.
are fixed parallel to the longitudinal direction of the cylindrical body 32. For example, when the level of the acoustic signal is low, a low voltage is applied to the DC motor 1, and when the level of the acoustic signal is high, a high voltage is applied, and the DC motor 1 rotates at a speed proportional to the applied voltage. .

The guide part 3 has a rotating shaft 35 of the DC motor 1 inside.
The cylindrical body 8 is inserted and fixed to the rotating shaft 35.
and a rod-shaped body 7 having a circular cross-sectional shape. As shown in FIG. It is fixed approximately at the center of the Weight 4
is a disc-shaped material made of metal such as iron or copper. A through hole 9 is bored in the center of the weight 4 along its thickness direction, and the rod-shaped body 7 of the guide portion 3 passes through this. Therefore, the weight 4 can freely slide along the rod-shaped body 7 between a position close to the rotating shaft 35 and a position away from the rotating shaft 35.

The spring 5 is a coil spring, and has a guide portion 3 inside.
A rod-shaped body 7 is inserted therethrough. One end of the spring 5 is locked to a disc-shaped locking part 10 provided at the tip of the rod-shaped body 7, and the other end contacts the disc surface of the weight 4 to guide the weight 4 to the guide part 3. is pressed against the cylindrical body 8. In this embodiment, the pressing force of the spring 5 is relatively small.

The operation of this vibration generator 6 for acoustic vibration device will be explained. When the rotating shaft 35 of the DC motor 1 is stopped, the weight 4 inserted into the rod-shaped body 7 of the guide part 3 is pressed against the rotating shaft 35 by the spring 5, as shown in FIG. Therefore, the center of gravity of the weight 4 is close to the center line of the rotating shaft 35. When the DC motor 1 is rotationally driven in this state, the moment of inertia of the weight 4 is small, so when the weight 4 is at the position on the tip end side of the rod-shaped body 7 of the guide section 3, the motor 1 rotationally drives the rotating shaft 35. The rotating shaft 35 can be quickly rotated with a voltage lower than the applied voltage required to do so. When the DC motor 1 rotates and the weight 4 rotates together with the rotating shaft 35, the weight 4 slides along the rod-shaped body 7 of the guide portion 3 in a direction away from the center line of the rotating shaft 35 due to centrifugal force. Thus, the force in the centrifugal direction and the force of the spring 5 are restrained at a position where they are balanced. Note that when a low voltage is applied to this DC motor 1 and the generated output is small, the centrifugal force acting on the weight 4 is small, so the weight 4
rotates while being restrained by the spring 5 at a position close to the center line of the rotating shaft 35, and vibrations of low frequency and small force are applied to the rotating shaft 35, causing the cylindrical body 32 that houses the vibration generator 6 to become small. It vibrates slightly. In this state, when a voltage higher than the above-mentioned low voltage is applied to the DC motor 1, since the DC motor 1 is already rotating, the rotation speed quickly becomes proportional to the applied voltage. At this time, the centrifugal force acting on the weight 4 is large and the pressing force of the coil spring 5 is also relatively weak, so the weight 4 is restrained by the tip of the rod-shaped body 7 of the guide section 3 and rotates as shown in FIG. , high-frequency, large-force vibrations are applied to the rotating shaft 35, causing the cylindrical body 32 to vibrate greatly.

A second embodiment will be explained with reference to FIG. The vibration generator 12 for an acoustic vibration device of this embodiment does not pass through the rod-shaped body 7 like the spring 5 of the vibration generator 6 of the first embodiment, but instead extends one end of the coil spring 11 as shown in the figure. The coil spring 11 is fixed to the tip of the rod-shaped body 7 of the guide part 3, and the other end of the coil spring 11 is attached to the periphery of the disc-shaped weight 4. The structure other than the coil spring 11 is the same as that of the first embodiment. It is the same as machine 6. When the rotating shaft 35 is stopped, the coil spring 11 tries to return to the straight state and presses the weight 4 against the rotating shaft 35, and when the rotating shaft 35 is rotating, the coil spring 11 acts on the weight 4. The weight 4 is restrained at a position where the force in the centrifugal direction and the force that causes the coil spring 11 to return to its straight state meet. By attaching the coil spring 11 in this way, the coil spring 1 that suppresses the weight 4
It becomes easier to adjust the force in step 1.

A third embodiment will be explained with reference to FIG. This vibration generator 13 for an acoustic vibration device uses a piano wire 1 instead of using the spring 5 in the vibration generator 6 of the first embodiment.
4, one end of the piano wire 14 is fixed to the tip of the rod-shaped body 7 of the guide section 3, the piano wire 14 is bent into a U shape, and the other end of the piano wire 14 is fixed to the tip of the rod-shaped body 7 of the guide section 3. It has a configuration in which it is brought into contact with the disk surface. The other configurations are the same as the vibration generator 6 of the first embodiment. This piano wire 14 has the same effect on the weight 4 as the coil spring in the first and second embodiments.

<Effects> The present invention suppresses the weight toward the rotating shaft when the rotating shaft of the DC motor is stopped, and allows the weight to move at least in the radial direction of the rotating shaft according to the rotational speed of the rotating shaft. Since the spring constant of the spring is selected, the motor rotates even if the voltage applied to the DC motor is low based on the level or sound range of the acoustic signal. Therefore, when the voltage applied to this motor changes from a low voltage to a high voltage due to, for example, a change in the level of an acoustic signal from a low level to a high level, the motor is already rotating, so the voltage applied to the motor changes immediately. It is possible to generate vibrations according to the voltage. This has the effect that the person using the acoustic vibration device using the vibration generator of the present invention can experience pleasant vibrations corresponding to the level of the acoustic signal.

[Brief explanation of the drawing]

FIG. 1a is a partial cross-sectional plan view showing the vibration generator for an acoustic vibration device according to the first embodiment of the present invention installed inside a cylindrical body, and FIG. 1b is the acoustic vibration device of FIG. 1a. FIG. 1c is a partial cross-sectional front view of the vibration generator for acoustic vibration device of FIG. 1a, and FIG. 2 is a direct current view of the vibration generator for acoustic vibration device of the same embodiment. FIG. 3 is a partially sectional front view showing a state in which the motor rotates and the weight is restrained at a position away from the rotation axis; FIG. 3 is a plan view showing a vibration generator for an acoustic vibration device according to the second embodiment; FIG. A plan view showing a vibration generator for an acoustic vibration device according to the third embodiment, FIG. 5a,
b is a partial cross-sectional view showing a state in which a conventional vibration generator for an acoustic vibration device is installed inside a cylindrical body. 1... DC motor, 3... Guide section, 4... Weight,
5... Spring.

Claims (1)

[Scope of utility model registration request] a direct current motor, a guide portion whose base end is fixed to the rotating shaft of the direct current motor and whose distal end extends in a direction away from the center line of the rotating shaft; one weight that is slidably provided on the guide section and one end of which is fixed to the tip of the guide section and the other end that is in contact with or connected to the weight; and a spring that presses against the rotating shaft side, and when the rotating shaft of the DC motor is stopped, the spring restrains the weight to be in almost contact with the rotating shaft, and the spring presses against the rotating shaft of the DC motor. and a spring having a spring constant that restrains the weight in a position that balances the centrifugal force acting on the weight when the rotating shaft is rotating at a rotational speed corresponding to an applied voltage. Generator.