JPS5819594Y2 - electric piano pickup device - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a pickup device for an electric piano that can obtain a tone close to that of a natural piano.

An electric piano converts string vibrations into electrical vibrations, amplifies them, and then produces sounds through speakers.

A pickup device using a piezoelectric element is known as an example of a means for converting string vibration into electrical vibration.

For example, as described in U.S. Pat. No. 3,519,721, a piezoelectric element is disposed within a recess of a holder having a U-shaped cross section, and a string is supported by an upper arm.
It is known that the vibration of the string is transmitted to the piezoelectric element via the upper arm.

Incidentally, in recent years, there has been a trend to make electric pianos generally capable of producing a variety of tones, thereby allowing musical instrument players to enjoy music even more.

However, since the pickup device with the above-mentioned configuration transmits the vibrations of the strings directly to the piezoelectric element via the holder, it is only possible to extract the tone of only the stretched strings, especially for natural pianos. It is not possible to obtain a unique low-frequency tone, and therefore a considerable amount of electrical correction is required, but this correction also has its limits, making it difficult to create a satisfactory tone.

Therefore, this invention has been improved in view of the above-mentioned drawbacks of the conventional technology, and has a simple structure and is easy to assemble and install.
The aim is to obtain a tone closer to that of a natural piano by enabling sound attenuation similar to that of a natural piano, and a string holding member is installed between the piezoelectric element placed on the frame and the strings. an electric piano, in which resonance parts are provided on both sides of the piano, extending in the direction in which the strings are stretched, and whose shape or material changes depending on the pitch range, and the string holding member is elastically supported by a frame. A pickup device is provided.

An embodiment of this invention will be described below in detail with reference to the drawings.

FIG. 1 is a sectional view of a main part of an embodiment of the electric piano pickup device of this invention.

In the same figure, a frame 1 formed of casting etc.
There is a pickup device 2 on the top surface of the pickup device 2.

This pickup device 2 has an insulator 3 on the frame 1.
A piezoelectric element 6 composed of an electrode 5 and a piezoelectric body 4 arranged through the piezoelectric element 6 is disposed, and a wedge-shaped protrusion 7a is integrally provided on the surface of the piezoelectric element 6, which has a relatively large area. A large reed-shaped string holding member T is arranged.

A guide pin 8 passes through one end of the string holding member 7 and is fixed to the frame 1 via a spring 9.

The string 10 is mounted on the top of such a pickup device 2.
is stretched, and the wedge-shaped protrusion 7 of the string holding member 7
It is like pushing a.

Both ends of the string 10 are locked to a tuning pin and a frame pin (not shown), and the tension of the string 10 can be adjusted by rotating the tuning pin.

In such a configuration, when a hammer (not shown) linked to the keyboard of the electric piano strikes the string 10, the string 10 vibrates,
This vibration is transmitted to the piezoelectric element 6 via the string holding member 7, and an electrical signal is generated there.

This electrical signal is then amplified and then output from a speaker.

FIG. 2 is a sectional view showing another embodiment of this invention.

In the figure, a pickup device 2 includes a piezoelectric body 4 disposed on the frame 1 with an insulator 3 interposed therebetween, and a piezoelectric body 4 disposed on the frame 1 via an insulator 3.
It is composed of a piezoelectric element 6 composed of a pair of electrodes 5 disposed so as to sandwich the string, and a string holding member I disposed on the piezoelectric element 6 and having a relatively large area.

The string holding member T is provided with a projection 7a with a sharp upper surface disposed along the direction in which the strings 10 are arranged at the center of the upper pile, and both side edges 1b of the string holding member T forming a resonating part.
is supported by a plurality of guide pins 8 set on the frame 1, so that it can be slightly moved up and down.

Acoustic insulators 13 such as rubber are provided in through holes drilled on both side peripheral edges γb of the string holding member 1 through which the guide pins 8 pass.
is fitted, and a compression coil spring 9 is elastically mounted between the string holding member 7 and the frame 1 and is mounted on the guide pin 8.

By the way, according to the support structure of the string holding member 7 as described above, since the string holding member 7 is supported so as to be able to vibrate,
Resonance occurs as the string 10 vibrates.

Therefore, the vibrations of each string transmitted to the string holding member 1 are propagated and diffused to both side edges 7b that constitute the resonant part of the string holding member 1, and are harmoniously synthesized. By appropriately setting and selecting materials etc., it is possible to provide a function as a diaphragm similar to the soundboard of a general piano or a diaphragm that resonates at a specific frequency among the vibrations of strings.

In other words, the thickness, width, etc. of the string holding member T vary depending on the pitch range.
When the material etc. are changed and the overall stiffness is set to be almost the same as the overall stiffness of the bridges and soundboard of a general piano, the string holding member 7 will perform the same function as the soundboard of a piano,
Since the vibration damping characteristics of the sound are greatly controlled, it is possible to obtain a sound quality and timbre that is closer to that of a piano sound.

In addition, since both side edges 7b constituting the resonant part of the string holding member 7 are elastically supported by the frame 1, excessive vibration is prevented, and the timbre due to the shape and material of the string holding member 7, etc.
Subtle correction of vibration damping characteristics.

FIG. 3 shows a plan view of a string holding member T configured to satisfy the above function, in which the side edge 7b constituting the resonating part of the string holding member I is continuous and its width (or thickness) is varied. The side edge 1b that constitutes the resonance part of the string holding member 7 is divided into a plurality of pieces to make it discontinuous.
Various structures can be adopted, such as a structure C in which a slit 14 is provided on one side edge (or only on one side edge), and the shape can be changed depending on the material selected.

On the other hand, if the string holding member 7 is given the function of a resonant plate that resonates with a certain frequency of the vibrations of the string 10, it will produce a sound that has a tone different from that of the conventional example. can be done.

In other words, the vibration sound of the string 10 includes a fundamental tone (frequency f) and many overtones (frequency ff) as shown in the spectrum of FIG.
...), and if the string holding member 7 is selected to have a shape or material that resonates with the overtones of the frequencies f and f as shown in FIG. The spectrum of the vibrations of the string 10 that is captured is a composite of these as shown in FIG.

Therefore, it is possible to obtain a tone different from the conventional tone produced only by the string 10.

The string holding member 7 can also be made to resonate with vibration sounds having various frequencies.

For example, as shown in the spectrum of FIG. 7, the fundamental frequency f1 is, for example, an octave lower than the natural frequency of the string. If you select a string holding member having It has the effect of producing a tone that includes sound.

In addition, this method eliminates the need for a complicated electronic circuit in order to obtain a unique tone from a unique string, as is the case in the past, and is therefore advantageous in terms of cost and space.

As described above, according to the electric piano pickup device according to the present invention, the string holding member is elastically supported so as to be able to vibrate, and the shape, material, etc. of the resonant parts provided on both side edges of the string holding member are changed depending on the pitch range. With this structure, excessive vibration of the resonant part of the string holding member can be prevented, and the vibration damping characteristics and timbre of the string can be varied in various ways, making it easy to form and correct the timbre and volume using an electronic circuit. be able to.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view showing one embodiment of the pickup device for an electric piano according to this invention, Fig. 2 is a longitudinal sectional view showing another embodiment of this invention, and Figs. 3 a to C are string holding members. A plan view showing one embodiment of the invention and FIGS. 4 to 8 show frequency spectra for explaining the effects of this invention. DESCRIPTION OF SYMBOLS 1... Frame, 2... Pickup device, 6... Piezoelectric element, 7... String holding member, 7a... Protrusion, 7b ...Side edge part (resonant part) of string holding member, 8... Guide bin,
10... Strings.

Claims (1)

[Scope of utility model registration request] A pickup device for an electric piano in which a piezoelectric element is arranged on a frame, and the vibration of a string is transmitted to the piezoelectric element via a string holding member and converted into an electric signal, wherein the string holding member is arranged on the piezoelectric element. A pickup device for an electric piano, characterized in that the pickup device has resonance portions extending in the string tension direction on both side line portions and whose shape or material partially changes, and is elastically supported by the frame.