Speaker System

• US 20180063633A1
• Filed: 08/28/2017
• Published: 03/01/2018
• Est. Priority Date: 08/31/2016
• Status: Active Grant

• Current Assignee: Yamaha Corporation
• Original Assignee: Yamaha Corporation
• Inventors: MURAMATSU, Toshihiko
• Granted Patent: US 10,623,850 B2
• Time in Patent Office: Days
• CPC Class Codes: H04R 1/02 Casings; Cabinets ; Supports therefor; Mountings therein H04R1/28 takes precedence ; attachments for microphones H04R1/08; mounting of transducers in earpieces H04R1/1075
• CPC Class Codes: H04R 1/2826 for loudspeaker transducers

Abstract

A speaker system includes: a speaker unit; a phase-inversion enclosure in which the speaker unit is installed; a bass reflex port that is installed in the phase-inversion enclosure, the bass reflex port having a tubular shape and having an opening, the bass reflex port extending in a first axial direction which is a direction from the opening towards an inside of the bass reflex port, at least a portion of a cross-section of the bass reflex port perpendicular to the first axial direction becoming gradually smaller as going in the first axial direction, and a length of the cross-section in a second axial direction parallel to the cross-section being constant along the first axial direction; and a first flow-regulating plate that is provided near the opening, the first flow-regulating plate having a shape adapted to a flow rate of airflow discharged from the opening or drawn into the opening.

Claims

1. A speaker system comprising:

a speaker unit;

a phase-inversion enclosure in which the speaker unit is installed;

a bass reflex port that is installed in the phase-inversion enclosure, the bass reflex port having a tubular shape and having an opening, the bass reflex port extending in a first axial direction which is a direction from the opening towards an inside of the bass reflex port, at least a portion of a cross-section of the bass reflex port perpendicular to the first axial direction becoming gradually smaller as going in the first axial direction, and a length of the cross-section in a second axial direction parallel to the cross-section being constant along the first axial direction; and

a first flow-regulating plate that is provided near the opening, the first flow-regulating plate having a shape adapted to a flow rate of airflow discharged from the opening or drawn into the opening.

2. The speaker system according to claim 1, further comprising:

a second flow-regulating plate that is provided at a position facing the opening in an area where the flow rate of the airflow is fastest, the second flow-regulating plate being away from the one opening by a predetermined distance, the second flow-regulating plate covering a gap formed between the first flow-regulating plate and a front plate of the bass reflex port.

3. The speaker system according to claim 1,

wherein the bass reflex port includes an air flow-regulating portion that extends from an inside of the bass reflex port towards the opening,

the air flow-regulating portion has a shape in which a width in a direction perpendicular to the first axial direction gradually widens as going from the inside of the bass reflex port toward the opening, the shape being conforming to an exponential function or to a predetermined radius of curvature, and

the first flow-regulating plate has one side having a shape corresponding to the shape of the air flow-regulating portion, and the shape of the one side is a shape of an arc that conforms to the exponential function or to the predetermined radius of curvature.

4. The speaker system according to claim 2, further comprising:

flow-regulating members provided on both edges of the second flow-regulating plate that serve as boundaries with the gap, the flow-regulating members having arc-shaped cross-sections parallel to the first flow-regulating plate.

5. The speaker system according to claim 1, wherein the bass reflex port is installed on an inner wall surface of a front plate of the bass reflex port.

6. The speaker system according to claim 1, wherein the bass reflex port is installed on an outer wall surface of a front plate of the bass reflex port.