JPH0117750B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is useful for investigating and researching the psychological and physiological effects of low-frequency pneumatic vibrations on the human body or animals, and the effects on the mechanical strength of buildings or furniture. This invention relates to a high-output low-frequency air vibration generator used for experiments and the like.

Generally, as means for artificially generating low-frequency pneumatic vibrations, it is conceivable to use a speaker, a blower, or the like. However, with speakers, it is difficult to obtain high-output pneumatic vibrations, and with blowers, there are problems in that the device itself becomes large and generates a large amount of noise.

It is also possible to convert rotary motion into linear reciprocating motion using a crankshaft, thereby vibrating the plate-like body and generating low-frequency pneumatic vibrations, but with this method, it is possible to change the waveform of the pneumatic vibrations generated. Although it is possible to relatively easily increase or decrease the vibration frequency of the plate by increasing or decreasing the rotational speed of the crankshaft, the amplitude cannot be easily changed.

The present invention has been made in view of the above-mentioned difficulties.
The plate-shaped body that generates pneumatic vibrations is configured to vibrate using a linear motor type, thereby making it possible to downsize the device and to obtain large output without noise. The present invention is characterized in that the vibration frequency, amplitude, etc. of the plate-shaped body for generation can be increased/decreased independently of each other, and the waveform of the generated pneumatic vibration can be arbitrarily controlled.

Hereinafter, embodiments of the present invention will be described in detail based on the drawings. In the first embodiment shown in FIGS. It can be mounted in any direction, such as horizontally or vertically, with one end facing the space where low-frequency vibrations are to be generated. This base body 1 has a slot 3a formed on the inner surface of a peripheral wall 3, and a coil (not shown) for generating a moving magnetic field is wound around the slot 3a to form a stator of a linear motor.
Stopper edges 2, 2 are provided around both ends of the base body 1 to prevent the vibrating body 6 from falling off the base body 1 due to runaway, and the inner surface of the peripheral wall 3 is coated with a lubricating sealing material layer 5. This reduces sliding resistance.

Vibrating body 6 accommodated in the internal space of the base 1
is configured as a movable element of a linear motor, and generates low frequency vibration by reciprocating the inside of the peripheral wall 3 of the base body 1, and includes a plate-like body 7 for generating pneumatic vibration formed in a substantially rectangular flat plate shape, A secondary conductor 8 made of aluminum, copper, etc. is fixed to the outer circumference of the secondary conductor 8 in the form of a frame, and a lubricating sealing material layer 9 that is in sliding contact with the lubricating sealing material layer 5 is adhered to the outer circumferential surface of the secondary conductor 8.

The linear motor composed of the base body 1 and the vibrating body 6 has a magnetic field that alternates between forward and reverse directions along the stator by passing an alternating current at a drive frequency through the coil through a drive control unit (not shown). Due to the interaction between the generated magnetic field and the induced current induced in the secondary conductor 8 based on the magnetic field, the secondary conductor 8 and the pneumatic vibration generating plate-like body 7 move toward the base 1.
It slides back and forth inside. In addition, the vibrating body 6 is detected by a position detector (not shown) provided in the base body 1.
By detecting the sliding position of , and reversing the phase advance angle of the alternating current supplied to the coil by the drive control section, the vibrating body 6 is thereby slid in the opposite direction, and this is performed continuously. It is also possible to vibrate the vibrating body with a required amplitude.

In this way, by arbitrarily setting the frequency of the alternating current supplied to the stator coil, or by arbitrarily setting the reversal position of the alternating current with a position detector, it is possible to create a planar air pressure with an arbitrary frequency and amplitude. You can get vibrations.

3 and 4 show a second embodiment of the present invention, 12 is a base body, and 13 is a vibrating body that slides inside the base body 12. FIG.

The base body 12 has a cylindrical frame shape with a circular hole, has stopper edges 14, 14 at both ends thereof, and radially slits 15, 14 on the inner peripheral surface.
5, . . . are recessed, a pair of cores 16, 16 are placed between each slit 15, and a coil (not shown) is wound around the cores 16, 16. Therefore, by passing an alternating current through this coil, a magnetic field for reciprocating the vibrating body 13 along the longitudinal direction of the slit 15 is generated. The lubricating sealing material layer 1 is provided on the inner surface of the base body 12 including the inner surface of the slit 15.
7 is attached.

The vibrating body 13 housed in the base body 12 includes a plate-like member 18 for generating pneumatic vibrations having a substantially disk shape, and a plate-like secondary conductor 1 around the plate-like member 18.
9, 19, . . . are arranged in a radial manner, and a lubricating sealing material layer 20 is applied to the outer surfaces of the plate-like body 18 and the secondary conductor 19.

The second embodiment with the above configuration operates in substantially the same manner as the first embodiment and generates low frequency vibrations, so a description thereof will be omitted.

A third embodiment of the present invention shown in FIG. 5 is for obtaining low frequency vibrations generated from a spherical vibration source or a point vibration source, and a tubular stator 23 equipped with a coil (not shown) is attached to a wall. The vibrating body 2 is fixed in a state where it passes through the body 24, has stoppers 25, 25 attached in the stator 23, and is provided with a secondary conductor 26.
A porous sphere 29 is fixed to the tip of a tube 28 leading to the stator 23 in a space in which the tube 7 is to be accommodated and low frequency vibrations are to be generated. It is covered with.
Further, a muffler 31 is disposed at the other end of the stator 23.

Therefore, when the vibrating body 27 is vibrated by a linear motor composed of the stator 23 and the vibrating body 27 equipped with the secondary conductor 26, the low frequency vibrations generated accordingly are transmitted through the numerous holes of the sphere 29. The low-frequency vibrations are transmitted to the flexible membrane 30 through the flexible membrane 29a and are periodically inflated to obtain low-frequency vibrations whose sound source is a small spherical surface that can be regarded as a spherical surface or a point. Note that in this case, low-frequency vibration noise is not propagated behind the wall 24 due to the muffler 31's muffling effect.

As described above, according to the high-power low-frequency air vibration generator of the present invention, since the pneumatic vibrator is reciprocally driven by the linear motor, (1) the shape and size of the vibrator can be formed as desired; .

(2) The vibration frequency and amplitude of the vibrating body can be set arbitrarily.

(3) The inertial mass of the movable parts including the vibrating body can be reduced.

(4) The structure becomes simpler.

(5) There is no need to connect a member that applies energy for direct driving to the vibrating body.

Therefore, the following effects can be obtained.

(a) The frequency band of the air pressure vibration sound generated is wide.

(b) Pneumatic vibrations with arbitrary waveforms can be easily generated.

(c) Air pressure vibrations can be obtained as plane waves or spherical waves.

(d) It is easy to manufacture.

(e) A structure suitable for the purpose can be created.

[Brief explanation of drawings]

Fig. 1 is a front view of the first embodiment of the present invention, Fig. 2 is a sectional view taken along the line A-A, Fig. 3 is a sectional view of the second embodiment of the invention, and Fig. 4 is a sectional view taken along the line B-B. FIG. 5 is a longitudinal sectional view of a third embodiment of the present invention. 1, 12... Base body, 6, 13, 27... Vibrating body,
8, 19, 26...Secondary conductor, 23...Stator.

Claims (1)

[Claims] 1. A linear motor stator is provided within a cylindrical frame-shaped base whose one end faces the space in which low-frequency pneumatic vibrations are to be generated, and within the base,
A vibrating body consisting of a plate-shaped body that partitions an internal space and a secondary conductor made of aluminum, copper, etc.
A high-output low-frequency air vibration generator, characterized in that the device is housed so as to be able to reciprocate in a straight line, and that a drive control unit that flows an alternating current at a drive frequency that causes the vibrating body to slide back and forth is connected to the coil of the stator. .