Patent US4893695A successfully refreshed from Google Patents.
US4893695A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Speaker system
Assignee: Panasonic Holdings Corp
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Filing: 1988-06-14
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Granted: 1990-01-16
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Expires: 2008-06-14
Abstract
Abstract A speaker system which has a speaker unit with a diaphragm and an acoustic path provided on the front side of the diaphragm so as to guide sound waves emitted from the diaphragm. The acoustic path is defined by a sound absorbing member. The space in the acoustic path and the sound absorbing member is separated by a partition member which is disposed in such a manner that at least a portion of the sound absorbing member is exposed to the space in the acoustic path, except that the portion of the sound absorbing member just adjacent the diaphragm is not exposed to the acoustic path. This arrangement eliminates peaks and troughs of resonance determined by the length of the acoustic path, so that flat sound pressure frequency characteristics can be obtained over a wide range up to high-pitch tone region.
Inventors
- 👤 Tadashi Tamura
- 👤 Shuji Saiki
- 👤 Kazue Sato
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 21:24
CPC Classifications
H; H04; H04R; H04R1/00; H04R1/20; H04R1/22; H04R1/30; H04R1/02; H04R1/32; H04R1/34; H04R1/345
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
114 words
A speaker system, comprising at least one diaphragm having front and rear surfaces; an acoustic path for guiding sound waves generated on said front surface of said diaphram; a sound absorbing member having an inner surface defining said acoustic path; and a partition member disposed on said inner surface of said sound absorbing member to surround a portion of said acoustic path, whereby said partition member is disposed such that said sound absorbing member is exposed to said acoustic path at at least one part of said sound absorbing member, said at least one part being located at any position of said sound absorbing member except at a region thereof just adjacent said diaphragm.
Claim 2
Dependent Claim
114 words
A speaker system, comprising at least one diaphragm having front and rear surfaces; an acoustic path for guiding sound waves generated on said front surface of said diaphram; a sound absorbing member having an inner surface defining said acoustic path; and a partition member disposed on said inner surface of said sound absorbing member to surround a portion of said acoustic path, whereby said partition member is disposed such that said sound absorbing member is exposed to said acoustic path at at least one part of said sound absorbing member, said at least one part being located at any position of said sound absorbing member except at a region thereof just adjacent said diaphragm.
Claim 3
Dependent Claim
43 words
A speaker system according to claim 1, wherein said partition member extends from the front surface of said diaphragm to a position which is spaced from said front surface of said diaphragm by about 1/3 of the full length of said acoustic path.
Claim 4
Dependent Claim
31 words
A speaker system according to claim 1, wherein the position where said sound absorbing member is exposed is in a region where a standing wave has a high particle velocity distribution.
Claim 5
Dependent Claim
52 words
A speaker system according to claim 3 wherein said sound absorbing member is exposed in a region which is spaced from the front surface of said diaphram by about 1/3 of the full length of said acoustic path and a region which is near the sound outlet opening of said acoustic path.
Claim 6
Dependent Claim
32 words
A speaker system according to claim 1, wherein the cross-sectional area of said acoustic path is progressively increased from one end near said diaphragm towards another end near said sound outlet opening.
Claim 7
Dependent Claim
38 words
A speaker system according to claim 5, further including an acoustic pipe having a wall surrounding said sound absorbing member, wherein said acoustic path is defined by said sound absorbing member and the wall of said acoustic pipe.
Claim 8
Dependent Claim
21 words
A speaker system according to claim 1, wherein said acoustic path has a constant cross-sectional area over the entire length thereof.
Claim 9
Dependent Claim
28 words
A speaker system according to claim 7, wherein said acoustic path is defined by the wall of said sound absorbing member and the wall of an acoustic pipe.
Claim 10
Dependent Claim
38 words
A speaker system according to claim 7, further including an acoustic pipe having a wall surrounding said sound absorbing member, whereby said acoustic path is defined by said sound absorbing member and said wall of said acoustic pipe.
Claim 11
Dependent Claim
45 words
A speaker system according to claim 1, further comprising a plurality of diaphragms having front and rear surfaces, said plurality of diaphragms including said at least one diaphragm, and wherein said acoustic path is provided commonly on the front side of said plurality of diaphragms.
Claim 12
Dependent Claim
18 words
A speaker system according to claim 1, wherein said sound absorbing member is provided in an acoustic pipe.
Claim 13
Dependent Claim
35 words
A speaker system according to claim 1, wherein the amount of the material of said sound absorbing member is progressively decreased from one end near said diaphram towards another end near said sound outlet opening.
Claim 14
Dependent Claim
36 words
A speaker system according to claim 1, wherein the flow resistance per unit area of said sound absorbing member is progressively decresed from one end near said diaphragm towards another end near said sound outlet opening.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-01-15 | 1993-07-17 | 1994-01-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-01-15 | 1997-07-17 | 1998-01-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-01-15 | 2001-07-17 | 2002-01-16 | $7700.00 | Window Closed / Lapsed |