JPS6326863Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a tremolo generating device, and in a tremolo generating device that generates a tremolo effect by rotating the speaker itself, the device is designed to rotate the speaker itself so that the two sides are connected to each other with respect to the joint surface that is approximately perpendicular to the rotation axis of the drive motor. A speaker is attached to the tremolo rotor body, which is a pair of molded parts made of rigid material that are approximately symmetrical and have a concave part in the center where the drive motor enters, and a speaker attachment part.A speaker is attached to the tremolo rotor body, and the center of gravity of the tremolo rotor is By making the center of rotation of the drive motor and the center of rotation of the drive motor close to each other, the number of components in the tremolo rotor structure can be reduced, assembly can be simplified, and the balance of the tremolo rotor can be made highly accurate, thereby improving the tremolo effect. Can be made in good condition,
Furthermore, it is an object of the present invention to provide a tremolo generating device that can eliminate the resonance phenomenon caused by the sound pressure radiated from a speaker and can produce a high sound pressure level.

Conventionally, a tremolo generating device has a structure in which a rotating reflector plate 2 is disposed with respect to a fixed speaker 1, as shown in FIG. 1, for example. In addition, 3
is the motor.

In such a tremolo generator, if you want to obtain a tremolo effect at a high volume, you can use a large speaker, but if the sound pressure radiated from the speaker increases, the reflection plate will cause resonance. As a result, a sound other than the sound radiated from the speaker is generated, which significantly impairs the tremolo effect. Therefore, the tremolo generating device as shown in FIG. 1 has a fatal drawback that the maximum permissible sound pressure level is necessarily small. Also, as a tremolo sound effect, you will not hear the direct sound from the speaker, but the indirect sound due to reflection,
Sound pressure decreases due to transmission loss, etc., making it impossible to obtain a large volume.

Furthermore, as shown in FIG. 2, a tremolo effect is produced by attaching a speaker 6 to a foamed rotor bracket 5 with one end open, rotating the rotor bracket 5 by a motor 7, and rotating the speaker itself. A generator has been proposed.

Compared to the tremolo generator shown in Figure 1, this type of tremolo generator has the advantage that there is no drop in sound pressure due to transmission loss, since the sound is heard directly from the speaker. However, if you increase the size of the speaker in order to obtain a tremolo effect at a high volume, the moment of inertia of the rotating system will significantly increase, and the load on the motor will increase, so a higher performance motor must be used. However, as the volume increases, the foamed rotor's full resonance will generate sound other than the sound radiated from the speaker, which will significantly impair the tremolo effect. The disadvantage is that the maximum permissible sound pressure level is small. In addition, because the foamed rotor buttful is foamable, the density is not uniform depending on the location, which makes it difficult to adjust the balance of the rotor buttful, and the rigidity is low, so it is difficult to attach the speaker or the rotation axis of the rotor buttful. It cannot be attached to the tremolo rotor generator using only nuts or tapping screws, making it difficult to install with high precision and requiring a large number of parts, which makes assembling the tremolo rotor generator complicated and costly. Become. Furthermore, since the rigidity is low, it is easy to deform with a slight force, and for example, deformation may occur due to rotation, making it difficult to maintain balance. Furthermore, since the rigidity of the rotor bracket is small, the rotor bracket itself vibrates due to the reaction of the speaker cone paper.
This causes energy loss, resulting in poor radiation efficiency from the speaker.

The present invention eliminates the above drawbacks, and examples thereof will be described below.

FIG. 3 is a partially sectional explanatory view of the tremolo generator according to the present invention, and FIG. 4 is a perspective view of the tremolo rotor.

In the figure, 20 and 21 are cross sections that are approximately symmetrical to each other.
It is a shaped member, and this cross section is approximately: shaped member 20, 2
1 is made by molding a rigid resin material such as ABS resin using a mold having a predetermined shape. The tremolo rotor main body 22 is then constructed by joining the members 20 and 21, each having a substantially cross-sectional shape, and connecting them, for example, with a suitable adhesive or tapping screw.

Note that recesses 20a and 21a are formed on the upper and lower surfaces of the tremolo rotor main body 22, respectively.

23 is a speaker attached to a predetermined position of the tremolo rotor body 22;
3 can be fixed by using ribs 24 and the like formed at predetermined positions of the members 20 and 21 having a substantially cross-sectional shape.

Reference numeral 25 denotes a balance weight disposed in a gap 26 formed by the recesses of the members 20 and 21 having a substantially round cross section, and the balance weight 25 maintains the overall balance. Note that depending on the molding configuration of the substantially cross-sectionally shaped member, it is possible to achieve balance without providing a special balancing weight.

In addition, 27 is a driving motor provided so that its upper part enters into the recess 20a, and 28 is a rotating shaft of the motor.

FIG. 5 is a partially sectional explanatory view of another embodiment of the tremolo generator according to the present invention, and FIG. 6 is a perspective view of the tremolo rotor.

In the figure, reference numerals 40 and 41 denote members having a substantially cross-sectional shape made in the same manner as in the above embodiment, and the tremolo rotor main body 42 is constructed by combining the mutually symmetrical cross-sectional substantially shape members 40 and 41. are doing.

Note that recesses 40a and 41a are formed on the upper and lower surfaces of the tremolo rotor body 42, respectively.

43 is a speaker attached to a predetermined position of the tremolo rotor main body 42, 44 is a balance weight, 45 is a driving motor disposed in the recess 40a, and 46 is a rotation shaft of the motor.

As mentioned above, in the tremolo generator, the tremolo rotor body is made of a member with high rigidity, that is, the present invention is more effective than when the speaker is fixed to the tremolo rotor body with low rigidity, such as foamed plastic. Fixing the speaker to a highly rigid tremolo rotor body like this reduces energy loss and allows higher sound pressure levels to be obtained. or,
Even if the sound pressure of the speaker is increased, the tremolo rotor body does not cause resonance, and therefore a larger input can be input to the speaker, and a higher sound pressure level can be obtained. Furthermore, if the tremolo rotor body to which the speaker is attached is of a closed type or a phase inversion type as in the above embodiment, the output sound pressure level will be much higher than that of a structure with an almost open back as shown in Fig. 2. .

Also, when making the tremolo rotor body by molding, as in the above example, if you make each half and join these halves together, you can easily make the tremolo rotor body. When made with a mold, the halves are perfectly symmetrical to each other, so even if the mold is slightly distorted and the molded product has an unbalanced part, the speaker side can be assembled facing each other. Viewed from above, the shift in the left and right centers of gravity is canceled, making balance adjustment extremely easy. Furthermore, since the outer shapes of the halves are the same, the air resistance against the upper and lower halves of the tremolo rotor body is the same, and the lifting force due to rotation and downward pushing force are balanced, resulting in the tremolo effect. No harmful vibrations are generated, and no excessive load is placed on the motor, etc. Further, since the balance weight is attached to the tremolo rotor body, the appearance is good, and furthermore, the tremolo effect is good without disturbing the air flow during rotation.

Furthermore, when the tremolo rotor body is molded from a highly rigid material, the shape of the tremolo rotor body may include a speaker holding part, a back cavity for the speaker, an attachment part to the motor, a balance weight attachment part, etc. It can be manufactured with high precision, there are fewer deviations in position and dimensions due to the installation of individual parts, and the balance of the rotation system does not shift significantly. Furthermore, if a hole is made in the center of the tremolo rotor body and the shaft of the motor is fitted therein, the centers of the motor and the tremolo rotor body will coincide. Therefore, the balance can be adjusted with reference to the center hole of the tremolo rotor body before it is attached to the motor, for example, in the assembled unit with the tremolo rotor body, speaker, weight, etc. Even when installed, the balance will not shift, which is good in terms of productivity. Furthermore, since the number of parts is small, the workability of assembly is very good.

As described above, the tremolo generating device according to the present invention is a tremolo generating device that generates a tremolo effect by rotating the speaker itself, and the tremolo generating device is a tremolo generating device that rotates the speaker itself to generate a tremolo effect. , the tremolo rotor body is made by joining a pair of molded parts made of rigid material with a recess in the center where the drive motor enters and a speaker mounting part.
Since the speaker is attached and the center of gravity of the tremolo rotor to which the speaker is attached is close to the rotation center of the drive motor, the number of parts in the tremolo rotor structure can be reduced, making assembly easier. Moreover, the tremolo rotor can be balanced with high accuracy, resulting in a good tremolo effect.In particular, since the upper and lower sides are approximately symmetrical with respect to the rotation of the tremolo rotor, the lifting force and pushing force are balanced, resulting in a good tremolo effect. Harmful vibrations are no longer generated, and since there is a recess for the drive motor to enter, and the drive motor is inserted into this recess, the center of gravity of the tremolo rotor body and the drive motor are closely aligned. The center of rotation will be close to the center of rotation, and as a result, the rotational wobbling of the tremolo rotor body will be reduced, and the air flow will not be disturbed.Moreover, since it is constructed as described above, the tremolo rotor body can be made of lightweight material such as styrofoam. Even if the tremolo rotor is made of heavy rigid material instead of solid wood, the negative effects of rotational shake are less likely to occur, making it possible for the first time to use rigid material, and as a result, the tremolo rotor body can be made of rigid material. Since the tremolo rotor body does not cause resonance due to the sound pressure radiated from the speaker, a larger input can be input to the speaker, and therefore a tremolo effect at a higher volume can be obtained. Since there is less loss, the volume can be louder, a tremolo effect with a higher sound pressure level can be obtained, and the cost is low.

[Brief explanation of the drawing]

1 and 2 are explanatory diagrams of a conventional tremolo generating device, FIGS. 3 and 4 are explanatory diagrams of a first embodiment of the tremolo generating device according to the present invention, and FIGS. 5 and 6 are explanatory diagrams of the present invention. FIG. 2 is an explanatory diagram of a second embodiment of the tremolo generating device according to the invention. 20, 21... Cross section: shaped member, 20a...
Recessed portion, 22, 42...Tremolo rotor body, 2
3,43...Speaker, 25,44...Balance weight, 27,45...Motor, 28,46...
Rotating shaft, 40, 41... cross section omitted = shaped member, 40
a... Concavity.

Claims (1)

[Scope of utility model registration request] In a tremolo generating device that generates a tremolo effect by rotating the speaker itself, the speaker and the recess into which the drive motor enters the center are approximately symmetrical to each other with respect to the joint surface that is approximately perpendicular to the rotation axis of the drive motor. A speaker is attached to a tremolo rotor body made by joining a pair of molded products made of rigid material having attachment parts, and the center of gravity of the tremolo rotor to which the speaker is attached is located close to the center of rotation of the drive motor. A tremolo generator featuring: