US-12621601-B2 - Electronic musical instrument and sound emitting unit

US12621601B2US 12621601 B2US12621601 B2US 12621601B2US-12621601-B2

Abstract

An electronic musical instrument includes a sound emitting unit disposed on a back surface of a top plate. The sound emitting unit includes: a speaker driver holding portion configured to hold a speaker driver configured to emit sound toward the top plate; a diffuser including a tapered shape and disposed on the speaker driver holding portion with a distal end portion of the diffuser facing the speaker driver, the diffuser being configured to guide a sound wave emitted from the speaker driver in a direction along the back surface of the top plate; and an attachment portion configured to suspend the speaker driver holding portion and attached to the back surface of the top plate.

Inventors

Kenta IOKU

Assignees

YAMAHA CORPORATION

Dates

Publication Date: 20260505
Application Date: 20240319
Priority Date: 20230322

Claims (14)

1 . An electronic musical instrument comprising: a sound emitting unit disposed on a back surface of a top plate, wherein the sound emitting unit comprises: a speaker driver holding portion configured to hold a speaker driver configured to emit sound toward the top plate; a diffuser including a tapered shape and disposed on the speaker driver holding portion with a distal end portion of the diffuser facing the speaker driver, the diffuser being configured to guide a sound wave emitted from the speaker driver in a direction along the back surface of the top plate; and an attachment portion configured to suspend the speaker driver holding portion and attached to the back surface of the top plate.
2 . The electronic musical instrument according to claim 1 , wherein a height of a top portion of the attachment portion is substantially the same as a height of a base end portion of the diffuser.
3 . The electronic musical instrument according to claim 2 , wherein the height of the base end portion of the diffuser does not exceed a height of the top portion of the attachment portion.
4 . The electronic musical instrument according to claim 1 , wherein the diffuser has a conical shape in which a cross-sectional shape of a base end portion is a first circle, and the speaker driver holding portion is configured to hold the speaker driver in a hole defining a second circle concentric with the first circle.
5 . The electronic musical instrument according to claim 1 , further comprising: a speaker box provided in the speaker driver holding portion at an opposite side of the diffuser.
6 . The electronic musical instrument according to claim 1 , wherein the electronic musical instrument is a keyboard electronic musical instrument.
7 . A sound emitting unit comprising: a speaker driver holding portion configured to hold a speaker driver; a diffuser including a tapered shape and disposed on the speaker driver holding portion with a distal end portion of the diffuser facing the speaker driver, the diffuser being configured to guide a sound wave emitted from the speaker driver in a direction away from a center axis of the speaker driver; and an attachment portion configured to suspend the speaker driver holding portion and attachable to another member, wherein the attachment portion extends upward from the speaker driver holding portion.
8 . The sound emitting unit according to claim 7 , wherein a height of a top portion of the attachment portion is substantially the same as a height of a base end portion of the diffuser.
9 . The sound emitting unit according to claim 8 , wherein the height of the base end portion of the diffuser does not exceed a height of the top portion of the attachment portion.
10 . The sound emitting unit according to claim 7 , wherein the diffuser has a conical shape in which a cross-sectional shape of a base end portion is a first circle, and the speaker driver holding portion is configured to hold the speaker driver in a hole defining a second circle concentric with the first circle.
11 . The sound emitting unit according to claim 7 , further comprising: a speaker box provided in the speaker driver holding portion at an opposite side of the diffuser.
12 . The sound emitting unit according to claim 7 , wherein the sound emitting unit is configured to be disposed on a back surface of a top plate of an electronic musical instrument.
13 . The sound emitting unit according to claim 7 , wherein the attachment portion extends upward in a direction along the center axis of the speaker driver.
14 . The sound emitting unit according to claim 7 , wherein the attachment portion includes an upper surface attachable to the another member.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS This application is based on and claims priority under 35 USC 119 from Japanese Patent Application No. 2023-044948 filed on Mar. 22, 2023, the contents of which are incorporated herein by reference. FIELD The present disclosure relates to an electronic musical instrument, such as a keyboard electronic musical instrument, and a sound emitting unit thereof. BACKGROUND A speaker such as a dynamic speaker that vibrates a diaphragm has strong directivity in a front direction. Therefore, an electronic musical instrument or the like uses a sound emitting unit in which a sound emitting control device called a diffuser is provided in front of the speaker. For example, in JP2020-178336A, a sound emitting unit including a conical diffuser with a distal end facing a diaphragm is provided on both left and right sides of a keyboard of a keyboard electronic musical instrument. SUMMARY In a technique disclosed in JP2020-178336A described above, since the sound emitting unit including the diffuser is provided at the height at which the keyboard of the keyboard electronic musical instrument is provided, uniform amplitude frequency characteristics may not be attained in a horizontal direction at a height of a head of a player, and the sound quality may change when the player moves the head. The present disclosure has been made in view of the above circumstances, and an object thereof is to provide an electronic musical instrument capable of attaining uniform amplitude frequency characteristics in a horizontal direction. The present disclosure provides an electronic musical instrument including a sound emitting unit disposed on a back surface of a top plate, in which the sound emitting unit includes: a speaker driver holding portion configured to hold a speaker driver configured to emit sound toward the top plate; a diffuser including a tapered shape and disposed on the speaker driver holding portion with a distal end portion of the diffuser facing the speaker driver, the diffuser being configured to guide a sound wave emitted from the speaker driver in a direction along the back surface of the top plate; and an attachment portion configured to suspend the speaker driver holding portion and attached to the back surface of the top plate. BRIEF DESCRIPTION OF DRAWINGS The present disclosure will be described in detail based on the following figures, wherein: FIG. 1 is a perspective view showing a configuration of a keyboard electronic musical instrument according to an embodiment of the present disclosure; FIG. 2 is a perspective view showing a configuration of a sound emitting unit according to the embodiment; and FIG. 3 is a cross-sectional view taken along a line Ia-Ib in FIG. 2. DETAILED DESCRIPTION Hereinafter, an embodiment of the present disclosure will be described with reference to the drawings. FIG. 1 is a perspective view showing a configuration of a keyboard electronic musical instrument 300 according to an embodiment of the present disclosure. FIG. 2 is a perspective view showing a configuration of a sound emitting unit 400 according to the present embodiment. FIG. 3 is a cross-sectional view taken along a line Ia-Ib in FIG. 2. Hereinafter, an orthogonal coordinate system including an X axis, a Y axis, and a Z axis that are orthogonal to one another will be assumed, and the configuration of the present embodiment will be described. The Z axis is a vertical axis. A sound emitting axis of a speaker driver 410 in the sound emitting unit 400 is an axis parallel to the Z axis. The X axis is an axis of the keyboard electronic musical instrument 300 in a left-right direction. The Y axis is an axis of the keyboard electronic musical instrument 300 in a front-rear direction. Hereinafter, a left side of the keyboard electronic musical instrument 300 in FIG. 1 may be referred to as a +X side, a right side of the keyboard electronic musical instrument 300 may be referred to as a −X side, a front side of the keyboard electronic musical instrument 300 may be referred to as a +Y side, a rear side of the keyboard electronic musical instrument 300 may be referred to as a −Y side, an upper side of the keyboard electronic musical instrument 300 may be referred to as a +Z side, and a lower side of the keyboard electronic musical instrument 300 may be referred to as a −Z side. Similarly to a normal keyboard electronic musical instrument, the keyboard electronic musical instrument 300 includes, on a housing thereof, a top plate 301 parallel to an XY plane. The sound emitting unit 400 according to the present embodiment is supported in a manner of being suspended from a back surface of the top plate 301, that is, a surface on the −Z side. In other words, the sound emitting unit 400 is disposed on the back surface of the top plate 301. The position of the top plate 301 in a Z direction substantially coincides with the position of the head of a player of the keyboard electronic musical instrument 300.