JPS5822237Y2 - Rotating speaker of electronic musical instrument - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a rotating speaker for an electronic musical instrument such as an electronic organ, in which the speaker is rotated in order to obtain a tremolo effect.

When obtaining a tremolo effect by rotating this rotating speaker, it is desirable to minimize the moment of the rotating system, and for this reason, conventionally the magnetic circuit section, which accounts for most of the speaker's weight, is placed as close as possible to the rotating shaft. was.

However, this alone is not enough; it is also necessary to consider the shape of the rotating body, because the shape of the rotating body can cause air resistance during rotation to be too large to ignore, causing load fluctuations and noise. It is.

In addition, if a general spooker is used as a rotary speaker as it is, so-called phase shift/crossing will occur and the low frequency response will deteriorate dramatically, so special speakers with the rear part of the speaker cone sealed had to use.

Figure 1 shows an example of a conventional rotary speaker, with a motor 1.
By transmitting the rotation of the belt 2 to the rotating shaft 3, the bracket 4 and the screw 5
The speaker 6, which is fixed at a constant value, rotates to produce a tremolo effect.

With this kind of configuration, the first problem is:
This is due to phase interference of the speaker 6. If a speaker with an open back side of a general paper cone is used, phase interference will occur and the low frequency characteristics will be significantly degraded. The drawback is that special speakers must be used that are sealed to prevent phase interference.Furthermore, due to the shape of the speaker, if it is subjected to large air resistance during rotation, it may cause noise or damage the motor. It had the drawback of being a huge burden.

This invention is intended to eliminate such drawbacks, and will be explained below with reference to the embodiments shown in FIGS. 2 and 3.

FIG. 2 is a side sectional view of the rotating speaker, and FIG. 3 is a perspective view of the substantially cylindrical rotating drum.

In these figures, 10 is a substantially cylindrical rotating drum molded from a lightweight polystyrene material having an acoustic baffle effect, etc., 11 is a speaker attached to one side of this substantially cylindrical rotating drum 10, and 12 is this speaker. This is a balancer for maintaining balance with the speaker 11, which is opposite to the speaker 11 and is attached to the side (outer side in the figure) of the substantially cylindrical rotating drum 10.

Reference numeral 13 designates a motor which is arranged at the center inside the substantially cylindrical rotating drum 10 via a frame 17, 18, etc. via a rubber bushing 15, 16 on a substrate 14, 19 is a stator thereof, and 20 is a rotor, which is a so-called outer rotor type motor. It is.

This motor 13 has a rubber bushing 2 on the top of the rotor 20.
A frame 22 is provided via 1, and this frame 22 supports approximately the center of the approximately cylindrical rotating drum 10.

Above speaker 11. Balancer 12 and frame 2
The means for attaching No. 2 to the approximately cylindrical rotating drum 10 are as follows:
Due to the nature of the material of the rotating drum, such as Styrofoam, the bracket 2
4 and screws 25 in a sandwich manner, thereby making use of the elasticity of the above-mentioned polystyrene foam to stabilize the speaker 11 and balancer 1.
It can be installed in a state that can sufficiently withstand even heavy objects.

Reference numerals 26 and 27 denote audio signal input terminals, which are connected to the Brasov 28 and 29 provided on the stator 19 of the motor 13, and the Brasov 28 and 29 are connected to the conductive ring 30 provided on the rotor 20.
．． 31, the audio signal input terminal 26.
27 to conductive ring 30.
Power is supplied to the speaker 11 to drive it through lead wires 32 and 33 connected between the input terminal of the speaker 11 and the input terminal of the speaker 11.

Since this invention is configured as described above, when the speaker 11 is driven and the substantially cylindrical rotating drum 10 is rotated by the motor 13, the substantially cylindrical rotating drum 10 faces the speaker 11. It is balanced and rotated stably by the balancer 12 provided, and since it has a substantially cylindrical outer shape, air resistance is also reduced.
Load fluctuations and noise generation are eliminated, and speaker 1
1 is installed in the above-mentioned approximately cylindrical rotating drum 10, and the front and rear of the cone paper are separated and housed, so that phase interference can be prevented from occurring.Furthermore, the approximately cylindrical rotating drum 10 is
Since it is molded from a material such as styrofoam that is lightweight and has an acoustic baffle effect, it is possible to reduce the moment of the rotation system when obtaining a tremolo effect and to exert a sufficient tremolo effect. Since space for arranging the motor and its driving force transmission mechanism is not required outside the approximately cylindrical rotating drum, the device can be made smaller, and lateral force is applied to the motor and the rotating shaft of the rotating drum. It has features such as stable rotation and long life, and even if the motor generates noise while rotating, it is blocked by the rotating drum, reducing the impact on the outside. be.

[Brief explanation of the drawing]

Fig. 1 is a side view showing an example of a rotary speaker for a conventional electronic musical instrument, Fig. 2 is a side sectional view showing an embodiment of the rotary speaker for an electronic musical instrument according to the present invention, and Fig. 3 is a substantially cylindrical rotating drum thereof. It is a perspective view showing an example of this. 10... substantially cylindrical rotating drum, 11...
・Speaker, 12... Balancer, 13...
... Motor, 14... Board, 15°16...
...Rubber bushing, 17.18...Frame, 19...Stator, 20...Rotor, 21...Rubber bushing, 22...・
...Frame, 23...Spacer, 24...
... Bracket, 25 ... Screw, 26
, 27...Audio signal input terminal, 28.29...
...Brasov, 30.31...Conductive ring, 32.33...Lead wire.

Claims (2)

[Scope of utility model registration request] (1) A speaker is installed inside one side of a roughly cylindrical rotating drum made of a lightweight material with an acoustic baffle effect, such as styrofoam, and a balancer is installed on the side of the rotating drum facing the speaker,
Furthermore, a rotary speaker for an electronic musical instrument is provided, in which a motor is disposed at the center of the rotary drum as a rotational drive source for the rotary drum, and the rotary drum is attached to the rotor of the motor to rotate the rotary drum. (2) Speakers, balancers, motors, etc. are attached to a roughly cylindrical rotating drum made of a lightweight material with an acoustic baffle effect, such as styrofoam, and are mounted in a sandwich manner using brackets and screws using the elasticity of the rotating drum. A rotary speaker for an electronic musical instrument according to claim 1 of the utility model registration claim.