US-12626674-B2 - Vibration plate and musical instrument

US12626674B2US 12626674 B2US12626674 B2US 12626674B2US-12626674-B2

Abstract

A vibration plate for a musical instrument includes: a plate-shaped vibration plate main body that has a deformation anisotropy property; a first elongated reinforcing member disposed on a first face of the vibration plate main body, and that projects outwardly from the first face and extends along the first face in a direction that prevents the vibration plate main body from deforming; and a second elongated reinforcing member disposed on a second face of the vibration plate main body, and that projects outwardly from the second face and extends along the second face in the direction that prevents the vibration plate main body from deforming. As viewed from a thickness direction of the vibration plate main body, at least part of the first elongated reinforcing member overlaps with at least part of the second elongated reinforcing member.

Inventors

Banri Abe
Ichiro Osuga
Masatsugu Okazaki
Shinji Sumino
Taishi SHINOHARA
Takashi Kitagawa
Takuya Abe

Assignees

YAMAHA CORPORATION

Dates

Publication Date: 20260512
Application Date: 20241112
Priority Date: 20211126

Claims (10)

1 . A vibration plate for a musical instrument, the vibration plate comprising: a plate-shaped vibration plate main body; a first elongated reinforcing member disposed on a first face of the vibration plate main body, and that projects outwardly from the first face and extends along the first face in a direction that prevents the vibration plate main body from deforming; and a second elongated reinforcing member disposed on a second face of the vibration plate main body, and that projects outwardly from the second face and extends along the second face in the direction that prevents the vibration plate main body from deforming.
2 . The vibration plate according to claim 1 , wherein, as viewed from the thickness direction of the vibration plate main body, at least the part of the first elongated reinforcing member overlaps with at least the part of the second elongated reinforcing member over an entire length of at least one of the first elongated reinforcing member or the second elongated reinforcing member.
3 . The vibration plate according to claim 1 , wherein: the vibration plate main body comprises wood having a wood grain extending along the first face and the second face, and the first elongated reinforcing member and the second elongated reinforcing member extend in a direction crossing a direction of the wood grain.
4 . The vibration plate according to claim 1 , wherein: the vibration plate main body comprises a plurality of laminated wooden plates, each of the plurality of the wooden plates has a wood grain extending along the first face and the second face, and the first elongated reinforcing member and the second elongated reinforcing member extend in a direction crossing a direction of the wood grain of at least one of the plurality of the wooden plates.
5 . The vibration plate according to claim 1 , wherein a stiffness of the first elongated reinforcing member and a stiffness of the second elongated reinforcing member are equal to each other.
6 . The vibration plate according to claim 1 , wherein the first elongated reinforcing member and the second elongated reinforcing member comprise a same material.
7 . The vibration plate according to claim 5 , wherein: a cross-sectional area of the first elongated reinforcing member and a cross-sectional area of the second elongated reinforcing member are equal to each other, the cross-sectional area of the first elongated reinforcing member is orthogonal to a lengthwise direction of the first elongated reinforcing member, and the cross-sectional area of the second elongated reinforcing member is orthogonal to a lengthwise direction of the second elongated reinforcing member.
8 . The vibration plate according to claim 1 , wherein the first elongated reinforcing member and the second elongated reinforcing member are line-symmetrical to each other in lengthwise directions of the first elongated reinforcing member and the second elongated reinforcing member.
9 . A vibration plate for a musical instrument, the vibration plate comprising: a plate-shaped vibration plate main body; a first elongated reinforcing member disposed on a first face of the vibration plate main body, and that projects outwardly from the first face and extends along the first face in a direction that prevents the vibration plate main body from deforming; and a second elongated reinforcing member disposed on a second face of the vibration plate main body, and that projects outwardly from the second face and extends along the second face in the direction that prevents the vibration plate main body from deforming, wherein the first elongated reinforcing member and the second elongated reinforcing member are laterally spaced apart as viewed from a thickness direction of the vibration plate main body, and wherein the lateral spacing between the first elongated reinforcing member and the second elongated reinforcing member is equal to or less than three times a maximum dimension of a cross section of the first elongated reinforcing member, the cross section being orthogonal to a lengthwise direction of the first elongated reinforcing member.
10 . A musical instrument comprising: a vibration plate comprising: a plate-shaped vibration plate main body; a first elongated reinforcing member disposed on a first face of the vibration plate main body, and that projects outwardly from the first face and extends along the first face in a direction that prevents the vibration plate main body from deforming; and a second elongated reinforcing member disposed on a second face of the vibration plate main body, and that projects outwardly from the second face and extends along the second face in the direction that prevents the vibration plate main body from deforming; and a vibrator configured to vibrate the vibration plate main body.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS The present application claims priority to Japanese Patent Application No. 2021-192024, filed Nov. 26, 2021, the contents of which are incorporated herein by reference. BACKGROUND OF THE INVENTION Field of the Invention The present disclosure relates to a vibration plate and a musical instrument. Description of Related Art Conventionally, some musical instruments emit sound by vibrating a vibration plate such as a soundboard with a vibrator. The vibrator operates according to, for example, an audio signal, and vibrates the vibration plate to produce sound from the vibration plate. PCT International Publication No. WO 2014/115482 (hereinafter Patent Document 1) discloses a structure in which a vibrator having a driving part and a movable part is attached to a musical instrument having a vibration plate (soundboard). In this vibrator, the movable part is electromagnetically connected to a magnetic path forming part (driving part) composed of magnets, cores, and so forth, and application of an electric current to the coil of the movable part causes the movable part to perform reciprocating motion in a linear direction relative to the magnetic path forming part, thereby causing the vibrator to vibrate. The driving part of the vibrator is fixed to a frame or the like of the musical instrument, and an end of the movable part in a vibration direction is fixed to the vibration plate. SUMMARY Incidentally, a vibration plate such as a soundboard expands/contracts or bending-deforms (warping-deforms) due to changes over time associated with the effects of temperature and humidity. Expansion/contraction deformation and bending deformation of the vibration plate are undesirable in musical instruments in which the vibration plate is vibrated by a vibrator. For example, if bending deformation occurs in the vibration plate, the normal line of a partial region of the vibration plate is inclined. In such a case, the vibration direction of the movable part fixed to the partial region of the vibration plate is inclined with respect to the driving part (magnetic path forming part). In such a state, the movable part may rub against the driving part as the movable part vibrates. If the movable part rubs against the driving part, vibrations caused by the rubbing are transmitted to the vibration plate, and this causes distortion in the sound produced by the vibration plate. That is to say, the bending deformation of the vibration plate affects the characteristics of sound production of the vibration plate performed by the vibrator. The present disclosure takes into consideration the above circumstances. An example object of the present disclosure is to provide a vibration plate capable of suppressing expansion/contraction deformation and/or bending deformation, and a musical instrument provided therewith. According to a first aspect of the present disclosure, a vibration plate for a musical instrument includes: a plate-shaped vibration plate main body that has a deformation anisotropy property; a first elongated reinforcing member disposed on a first face of the vibration plate main body, and that projects outwardly from the first face and extends along the first face in a direction that prevents the vibration plate main body from deforming; and a second elongated reinforcing member disposed on a second face of the vibration plate main body, and that projects outwardly from the second face and extends along the second face in the direction that prevents the vibration plate main body from deforming. As viewed from a thickness direction of the vibration plate main body, at least part of the first elongated reinforcing member overlaps with at least part of the second elongated reinforcing member. According to a second aspect of the present disclosure, a vibration plate for a musical instrument includes: a plate-shaped vibration plate main body that has a deformation anisotropy property; a first elongated reinforcing member disposed on a first face of the vibration plate main body, and that projects outwardly from the first face and extends along the first face in a direction that prevents the vibration plate main body from deforming; and a second elongated reinforcing member disposed on a second face of the vibration plate main body, and that projects outwardly from the second face and extends along the second face in the direction that prevents the vibration plate main body from deforming. The first elongated reinforcing member and the second elongated reinforcing member are laterally spaced apart as viewed from a thickness direction of the vibration plate main body. The lateral spacing between the first elongated reinforcing member and the second elongated reinforcing member is equal to or less than three times a maximum dimension of a cross section of the first elongated reinforcing member, the cross section being orthogonal to a lengthwise direction of the first elongated reinforcing member.