# US 2009/0260915 A1 · Speaker Apparatus > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2009/0260915 A1 - Document ID: US20090260915A1 - Status: Published application - Kind: A1 - Application number: 12/410,917 - Filed: 2009-03-25 - Published: 2009-10-22 - Earliest claimed: 2008-03-27 - Assignees: Yamaha Corporation - Inventors: Akira ARAI - Web page: https://patentgrep.com/patent/US20090260915A1 ## CPC - H04R 1/2826: {for loudspeaker transducers} - 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) ## Abstract A speaker apparatus according to the present invention includes a phase inversion-type enclosure in which a speaker unit and a bass reflex port are installed, the bass reflex port having a tubular body whose hollow cross-sectional area gradually becomes smaller from one opening side toward an inside of the bass reflex port in an axial direction of the bass reflex port, and a length in one direction of the hollow cross section of the tubular body not changing and constant along the axial direction. ## Claims ### Claim 1 A speaker apparatus comprising a phase inversion-type enclosure in which a speaker unit and a bass reflex port are installed, the bass reflex port having a tubular body whose hollow cross-sectional area gradually becomes smaller from one opening side toward an inside of the bass reflex port in an axial direction of the bass reflex port, and a length in one direction of the hollow cross section of the tubular body not changing and constant along the axial direction. ### Claim 2 (depends on 1) The speaker apparatus according to claim 1, wherein the tubular body has a shape in which the hollow cross-sectional area gradually increases from a location where the hollow cross-sectional area is smallest toward another bass reflex port opening side in the axial direction. ### Claim 3 (depends on 1) The speaker apparatus according to claim 1, wherein a predetermined length portion of the tubular body portion along the axial direction at a location at which the hollow cross-sectional area is smallest is a main tubular portion in which the hollow cross-sectional area is constant, and a portion of the tubular body portion that connects to at least one end of the main tubular portion and in which the hollow cross-sectional area gradually increases from a side that connects to the main tubular portion toward the opening end of the bass reflex port and in which the length in the one direction of the hollow cross section is a constant dimension, is an air rectifier. ### Claim 4 (depends on 2) The speaker apparatus according to claim 2, wherein a predetermined length portion of the tubular body portion along the axial direction at the location at which the hollow cross-sectional area is smallest is a main tubular portion in which the hollow cross-sectional area is constant, and a portion of the tubular body portion that connects to at least one end of the main tubular portion and in which the hollow cross-sectional area gradually increases from a side that connects to the main tubular portion toward the opening end of the bass reflex port and in which the length in the one direction of the hollow cross section is a constant dimension, is an air rectifier. ### Claim 5 (depends on 1) The speaker apparatus according to claim 1, wherein an opening portion of the bass reflex port is provided in a direction different from the axial direction. ### Claim 6 (depends on 2) The speaker apparatus according to claim 2, wherein an opening portion of the bass reflex port is provided in a direction different from the axial direction. ### Claim 7 (depends on 3) The speaker apparatus according to claim 3, wherein an opening portion of the bass reflex port is provided in a direction different from the axial direction. ### Claim 8 (depends on 4) The speaker apparatus according to claim 4, wherein an opening portion of the bass reflex port is provided in a direction different from the axial direction. ### Claim 9 (depends on 3) The speaker apparatus according to claim 3, wherein the main tubular portion and the air rectifier are arranged so that a center of the hollow cross section of the main tubular portion that is perpendicular to the axial direction and a center of the hollow cross section of the air rectifier that is perpendicular to the axial direction agree, and walls of connecting portions of the main tubular portion and the air rectifier have a shape that smoothly connects walls of the main tubular portion and walls of the air rectifier. ### Claim 10 (depends on 4) The speaker apparatus according to claim 4, wherein the main tubular portion and the air rectifier are arranged so that a center of the hollow cross section of the main tubular portion that is perpendicular to the axial direction and a center of the hollow cross section of the air rectifier that is perpendicular to the axial direction agree, and walls of connecting portions of the main tubular portion and the air rectifier have a shape that smoothly connects walls of the main tubular portion and walls of the air rectifier. ### Claim 11 (depends on 3) The speaker apparatus according to claim 3, wherein an opening portion of the bass reflex port is provided in a different direction from the axial direction, the main tubular portion and the air rectifier are arranged so that a center of the hollow cross section of the main tubular portion that is perpendicular to the axial direction and a center of the hollow cross section of the air rectifier that is perpendicular to the axial direction agree, and walls of connecting portions of the main tubular portion and the air rectifier have a shape that smoothly connect walls of the main tubular portion and walls of the air rectifier. ### Claim 12 (depends on 4) The speaker apparatus according to claim 4, wherein an opening portion of the bass reflex port is provided in a different direction from the axial direction, the main tubular portion and the air rectifier are arranged so that a center of the hollow cross section of the main tubular portion that is perpendicular to the axial direction and a center of the hollow cross section of the air rectifier that is perpendicular to the axial direction agree, and walls of connecting portions of the main tubular portion and the air rectifier have a shape that smoothly connect walls of the main tubular portion and walls of the air rectifier.