# US 12,003,918 B2 · Electronic musical instrument and electronic keyboard instrument > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,003,918 B2 - Document ID: US12003918B2 - Status: Granted - Kind: B2 - Application number: 17/200,724 - Filed: 2021-03-12 - Published: 2021-09-23 - Granted: 2024-06-04 - Earliest claimed: 2020-03-17 - Assignees: Casio Computer Co., Ltd. - Applicants: Casio Computer Co., Ltd. - Inventors: Ryohei Kobayashi; Hiroki Akai; Teruo Jinbo; Kouji Oshima; Shingo Fukushima - Web page: https://patentgrep.com/patent/US12003918B2 ## CPC - H04R 1/2826: {for loudspeaker transducers} - G10H 1/32: Constructional details - G10H 1/344: {Structural association with individual keys (electrically operated wind-actuated organs G10B3/22)} - H04R 1/025: {Arrangements for fixing loudspeaker transducers, e.g. in a box, furniture} - H04R 1/2834: {for loudspeaker transducers} - H04R 1/403: {loud-speakers} - H04R 3/12: for distributing signals to two or more loudspeakers {(specially adapted for hearing aids H04R25/407)} - G10H 2220/221: Keyboards, i.e. configuration of several keys or key-like input devices relative to one another - H04R: LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS (producing sounds with frequency not determined by supply frequency G10K) - G10H: ELECTROPHONIC MUSICAL INSTRUMENTS; INSTRUMENTS IN WHICH THE TONES ARE GENERATED BY ELECTROMECHANICAL MEANS OR ELECTRONIC GENERATORS, OR IN WHICH THE TONES ARE SYNTHESISED FROM A DATA STORE ## Abstract An electronic musical instrument according to one embodiment of the present disclosure includes a loudspeaker which releases sounds in a first direction in accordance with an instrument playing operation, an internal component which includes a substrate, a case which houses the loudspeaker and the internal component and has a first region which faces a rear face of the loudspeaker and a second region which faces a rear face of the internal component and does not face the rear face of the loudspeaker, and a sound releasing member which is disposed on an installation face side and in the second region, and releases acoustics in an acoustic space which is formed around the loudspeaker in a second direction which is opposite to the first direction. ## Claims ### Claim 1 An electronic musical instrument comprising: a loudspeaker which releases sounds in a first direction in accordance with an instrument playing operation; an internal component which includes a substrate; a case which houses the loudspeaker and the internal component and has a first region which faces a rear face of the loudspeaker and a second region which faces a rear face of the internal component and does not face the rear face of the loudspeaker, wherein the case includes a first case and a second case; a sound releasing member which is disposed on an installation face side of the case and in the second region, and releases acoustics in an acoustic space which is formed around the loudspeaker in a second direction which is opposite to the first direction; and an intermediate member which houses the loudspeaker therein, wherein the intermediate member has a fixing hole for mutually fixing the first case, the second case, and the intermediate member. ### Claim 2 (depends on 1) The electronic musical instrument according to claim 1, wherein the sound releasing member includes either at least part of a bass reflex duct or a passive radiator. ### Claim 3 (depends on 2) The electronic musical instrument according to claim 2, wherein the case has a first fixing part which at least fixes one board component of the sound releasing member which has a first length as a length which is measured in a longitudinal direction of the bass reflex duct and a second fixing part which fixes another board component which has a second length which is shorter than the first length as a length which is measured in the longitudinal direction of the bass reflex duct. ### Claim 4 (depends on 2) The electronic musical instrument according to claim 2, wherein the case has: a plurality of U-shaped grooves which extend in a longitudinal direction of the bass reflex duct on the installation face side, and a plurality of sound holes which are arrayed in a transverse direction and the longitudinal direction of the bass reflex duct and function as bass reflex ports in bottoms of the plurality of U-shaped grooves in the second region. ### Claim 5 (depends on 4) The electronic musical instrument according to claim 4, wherein a reinforcement rib which extends in the longitudinal direction of the bass reflex duct is disposed on each lateral portion between every two mutually adjacent grooves of the plurality of U-shaped grooves in the second region. ### Claim 6 (depends on 1) The electronic musical instrument according to claim 1, wherein: the intermediate member is disposed in the case and houses the loudspeaker therein and forms the acoustic space by being fixed to the case, and the intermediate member has a region in which the loudspeaker is disposed and a region on an outer side of which the internal component is disposed. ### Claim 7 (depends on 6) The electronic musical instrument according to claim 6, wherein in the intermediate member, a height from a bottom face to a top face of the region in which the loudspeaker is disposed is higher than a height from a bottom face to a top face of the region on the outer side of which the internal component is disposed. ### Claim 8 (depends on 6) The electronic musical instrument according to claim 6, wherein the intermediate member has a sound releasing hole in the region in which the loudspeaker is disposed. ### Claim 9 (depends on 6) The electronic musical instrument according to claim 6, wherein the intermediate member has a side wall part which extends from an outer edge of a top face to a bottom face of each of the region in which the loudspeaker is disposed and the region on the outer side of which the internal component is disposed. ### Claim 10 (depends on 6) The electronic musical instrument according to claim 6, wherein the intermediate member has an inclined part at a boundary between the region in which the loudspeaker is disposed and the region on the outer side of which the internal component is disposed. ### Claim 11 An electronic musical instrument comprising: a loudspeaker which releases sounds in a first direction in accordance with an instrument playing operation; a case which houses the loudspeaker and has a plurality of sound holes which function as bass reflex ports which release acoustics in an acoustic space which is formed around the loudspeaker in a second direction which is opposite to the first direction, in a second region which does not include a first region which faces a rear face of the loudspeaker, wherein the case includes a first case and a second case; a board component which is fixed to the case in the second region and forms a bass reflex duct together with an inner wall of the case, wherein the bass reflex duct is arranged such that the acoustics in the acoustic space pass through the bass reflex duct and then are released outside the case through the bass reflex ports; and an intermediate member which houses the loudspeaker therein, wherein the intermediate member has a fixing hole for mutually fixing the first case, the second case, and the intermediate member. ### Claim 12 (depends on 11) The electronic musical instrument according to claim 11, wherein the case has a first fixing part which at least fixes, as the board component, a first board component which has a first length as a length which is measured in a longitudinal direction of the bass reflex duct and a second fixing part which fixes, as the board component, a second board component different from the first board component and which has a second length which is shorter than the first length as a length which is measured in the longitudinal direction of the bass reflex duct. ### Claim 13 (depends on 11) The electronic musical instrument according to claim 11, wherein: the intermediate member is disposed in the case and houses the loudspeaker therein and forms the acoustic space by being fixed to the case, and the intermediate member has a region in which the loudspeaker is disposed and a region on an outer side of which an internal component including a substrate is disposed. ### Claim 14 (depends on 13) The electronic musical instrument according to claim 13, wherein in the intermediate member, a height from a bottom face to a top face of the region in which the loudspeaker is disposed is higher than a height from a bottom face to a top face of the region on the outer side of which the internal component is disposed. ### Claim 15 (depends on 13) The electronic musical instrument according to claim 13, wherein the intermediate member has a sound releasing hole in the region in which the loudspeaker is disposed for releasing the sounds released by the loudspeaker in the first direction. ### Claim 16 (depends on 13) The electronic musical instrument according to claim 13, wherein the intermediate member has a side wall part which extends from an outer edge of a top face to a bottom face of each of the region in which the loudspeaker is disposed and the region on the outer side of which the internal component is disposed. ### Claim 17 (depends on 13) The electronic musical instrument according to claim 13, wherein the intermediate member has an inclined part at a boundary between the region in which the loudspeaker is disposed and the region on the outer side of which the internal component is disposed. ### Claim 18 (depends on 11) The electronic musical instrument according to claim 11, wherein the case has: a plurality of U-shaped grooves which extend in a longitudinal direction of the bass reflex duct on an installation face side of the case, and the plurality of sound holes which are arrayed in a transverse direction and the longitudinal direction of the bass reflex duct and function as the bass reflex ports in bottoms of the plurality of U-shaped grooves in the second region. ### Claim 19 (depends on 18) The electronic musical instrument according to claim 18, wherein a reinforcement rib which extends in the longitudinal direction of the bass reflex duct is formed on each lateral portion between every two mutually adjacent grooves of the plurality of U-shaped grooves in the second region. ### Claim 20 An electronic keyboard instrument comprising: a keyboard; a plurality of loudspeakers which releases sounds in a first direction in accordance with an instrument playing operation; a case which houses therein at least the plurality of loudspeakers; and a plurality of sound releasing members which are disposed on an installation face side of the case and between the plurality of loudspeakers and release acoustics in respective acoustic spaces which are formed around the plurality of loudspeakers respectively in a second direction which is opposite to the first direction, wherein the plurality of loudspeakers are arranged rearward of the keyboard in a front-rear direction perpendicular to an array direction of keys of the keyboard such that, when viewed from a top-bottom direction perpendicular to the front-rear direction and the array direction, the plurality of loudspeakers and the keyboard do not overlap.