Speaker system

• US 4,611,686 A
• Filed: 06/20/1985
• Issued: 09/16/1986
• Est. Priority Date: 06/25/1984
• Status: Expired due to Fees

• Current Assignee: Clarion Co., Ltd. (Faurecia SA)
• Original Assignee: Clarion Co., Ltd. (Faurecia SA)
• Inventors: Kobayashi, Yoshiaki, Yoshida, Hiroshi
• Primary Examiner(s): Fuller, Benjamin R.
• Application Number:
  US06/747,151
• Time in Patent Office: 453 Days
• Field of Search: 181/155, 181/156, 181/199
• US Class Current: 181/156
• CPC Class Codes: H04R 1/2826 for loudspeaker transducers

Abstract

A speaker system includes an enclosure having a port from which a duct extends into the interior of the enclosure. A board having a smaller area than the cross-sectional area of at least the exit of the duct is mounted to block the port except a slight slit defined by the entire circumferential edge of the board and the opposed inner wall of the duct, so that the slight slit serves as a pressure duct whereas the remainder of the duct serves as a guide duct.

Claims

1. A speaker system, comprising:

an enclosure having therein at least one speaker;

a duct which is provided within said enclosure, communicates with the interior of said enclosure, and communicates with the exterior of said enclosure through a port provided in a wall of said enclosure; and

a flat, platelike board having a size smaller than the size of said port and positioned in the center of said port so as to extend approximately parallel to an exterior surface portion of said wall in the region of said port, said board cooperating with an inner wall of said duct adjacent said port to define a narrow, circumferential slit which has a uniform width along the entire circumference of said board and which has a smaller total cross-sectional size than the cross-sectional size of said duct in the region of said port;

wherein said port is provided in a front baffle which defines a front limit of said enclosure.

2. A speaker system, comprising:

an enclosure having at least one speaker therein and having a duct which extends into said enclosure from a port provided in an exterior surface of a wall of said enclosure, said duct having a first portion which is adjacent said port and having a second portion which is spaced from said port and has a cross-sectional size smaller than the cross-sectional size of said first portion, said first and second portions of said duct being connected by an outwardly facing annular step which has a substantially uniform width at all locations therealong; and

a board which is disposed in and extends across said first portion of said duct, which has a peripheral edge surface which is spaced substantially a uniform distance from an inner surface of said first portion of said duct at all locations around said board and which has a rear surface which faces and has its peripheral edges spaced from said annular step, said uniform distance being less than said width of said step.

3. The speaker system according to claim 2, wherein said board has an outwardly facing side surface which is substantially flush with said exterior surface of said wall of said enclosure.

4. The speaker system according to claim 2, wherein said inwardly facing surface of said first portion of said duct converges gradually in a direction away from said port;

wherein an inwardly facing surface of said second portion of said duct also converges gradually in a direction away from said port; and

wherein said peripheral edge surface of said board converges gradually in a direction away from said port.

5. The speaker system according to claim 4, including a plurality of legs which extend between and are substantially perpendicular to adjacent portions of said rear surface of said board and said annular step, said legs supporting said board in said duct.

6. The speaker system according to claim 5, wherein said board is flat and substantially rectangular, and wherein said duct has a substantially rectangular cross-sectional shape.

7. The speaker system according to claim 3, wherein said wall of said enclosure has a curved portion in the region of said port, and wherein said board has a curvature corresponding to the curvature of said wall.