Speaker system

• US 10,623,850 B2
• Filed: 08/28/2017
• Issued: 04/14/2020
• Est. Priority Date: 08/31/2016
• Status: Active Grant

• Current Assignee: Yamaha Corporation
• Original Assignee: Yamaha Corporation
• Inventors: Muramatsu, Toshihiko
• Primary Examiner(s): Phillips, Forrest M
• Application Number:
  US15/688,087
• Publication Number:
  US 20180063633A1
• Time in Patent Office: 960 Days
• Field of Search: 181156, 181148
• 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 that includes a front plate in which the speaker unit is installed, the front plate having an opening;

a bass reflex port that is installed in the phase-inversion enclosure, the bass reflex port comprising a tubular body, the tubular body having a tubular shape and having first and second openings, the tubular body extending in a first axial direction which is a direction from the first opening towards an inside of the tubular body, an area of at least a portion of a cross-section of the tubular body 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 predetermined second axial direction parallel to the cross-section being constant along the first axial direction, the tubular body comprising a flat plate that has a flat surface perpendicular to the predetermined second axial direction, one side of the flat plate defining an edge of the first opening;

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

a connecting space portion that connects the second opening to the opening of the front plate,

wherein one side of the first flow-regulating plate has a shape of an arc that conforms to an exponential function or to a predetermined radius of curvature,

wherein the bass reflex port is installed on an inner surface of the front plate or an outer surface of the front plate,

wherein the first axial direction is parallel to the inner surface or the outer surface, and

wherein the first flow-regulating plate is provided near the one side of the flat plate, and the first flow-regulating plate is parallel to the flat plate.

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

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

3. The speaker system according to claim 2, wherein the second flow-regulating plate is convex in a direction towards the first opening, and the second flow-regulating plate has a shape of an arc or a shape of a curve that conforms to an exponential function.

4. The speaker system according to claim 3, 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.