Speaker apparatus

• US 8,028,792 B2
• Filed: 03/25/2009
• Issued: 10/04/2011
• Est. Priority Date: 03/27/2008
• Status: Active Grant

• Current Assignee: Yamaha Corporation
• Original Assignee: Yamaha Corporation
• Inventors: Arai, Akira
• Primary Examiner(s): LUKS, JEREMY AUSTIN
• Application Number:
  US12/410,917
• Publication Number:
  US 20090260915A1
• Time in Patent Office: 923 Days
• Field of Search: 181/148, 181/152, 181/156, 181/199, 181/192, 181/195, 381/345, 381/349, 381/352
• US Class Current: 181/156
• CPC Class Codes: H04R 1/2826 for loudspeaker transducers

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

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, a length in one direction of the hollow cross section of the tubular body being not changing and constant along the axial direction of the bass reflex port, a length in other direction of the hollow cross section of the tubular body being changing along the axial direction of the bass reflex port, and the one direction being perpendicular to both the other direction and to the axial direction of the bass reflex port;

wherein, a predetermined length portion of the tubular body portion along the axial direction of the bass reflex port 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,

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 is an air rectifier,

the speaker unit is provided at a first end of the enclosure in an axial direction of the enclosure,

a first opening portion of the bass reflex port is provided directly under the speaker unit in the axial direction of the bass reflex port,

a second opening portion of the bass reflex port is provided at a second end of the enclosure in the axial direction of the enclosure, the first and second ends of the enclosure are opposite to each other with respect to the axial direction of the enclosure, and

the second opening portion of the bass reflex port is provided in a direction different from an axial direction of the air rectifier.

2. 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 of the bass reflex port.

3. The speaker apparatus according to claim 1, 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 of the bass reflex port and a center of the hollow cross section of the air rectifier that is perpendicular to the axial direction of the bass reflex port 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.