Patent US4903308A successfully refreshed from Google Patents.
US4903308A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Audio transducer with controlled flexibility diaphragm
Assignee: Speaker Acquisition Sub A Cayman Island Corp
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Filing: 1988-02-10
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Granted: 1990-02-20
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Expires: 2008-02-10
Abstract
Abstract An improved audio transducer includes a diaphragm having a pair of cylindrically-shaped webs that provide greater bandwidth, reduced distortion and greater horizontal dispersion of sound. The audio output of the transducer is further improved by forming the diaphragm of a polyvinyl fluoride film. Other improvements include the use of damping pads to damp internal sound waves and damping strips on the diaphragm to minimize distortion at the resonant frequency of the transducer.
Inventors
- 👤 Paul W. Paddock
- 👤 Steven R. Geist
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 18:47
CPC Classifications
H; H04; H04R; H04R7/00; H04R7/02; H04R7/12; H04R9/00; H04R9/02; H04R9/06; H04R9/063; H04R9/025
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
107 words
An audio transducer, comprising: a frame; a diaphragm comprising a pair of elongate resilient webs having portions joined to each other to form a movable expanse extending substantially in a plane, the expanse being movable in the direction of the plane, the webs each having a flexible end portion extending from the expanse in an arc to a remote frame location, each frame location substantially aligned through the expanse with the other remote frame location; coil means attached to the expanse of the diaphragm; magnetic means for producing opposing magnetic fields extending normal to the expanse; and connecting means for conducting electrical impulses to the coil means.
Claim 2
Dependent Claim
107 words
An audio transducer, comprising: a frame; a diaphragm comprising a pair of elongate resilient webs having portions joined to each other to form a movable expanse extending substantially in a plane, the expanse being movable in the direction of the plane, the webs each having a flexible end portion extending from the expanse in an arc to a remote frame location, each frame location substantially aligned through the expanse with the other remote frame location; coil means attached to the expanse of the diaphragm; magnetic means for producing opposing magnetic fields extending normal to the expanse; and connecting means for conducting electrical impulses to the coil means.
Claim 3
Dependent Claim
39 words
The audio transducer of claim 1 including dampening means mounted to the frame within the arc of each web portion and spaced apart from the diaphragm for dampening the frequency response of the diaphragm above a predetermined cutoff frequency.
Claim 4
Dependent Claim
35 words
The audio transducer of claim 2 wherein the dampening means comprises a felt pad within the arc of each web, the felt pad sized to extend substantially from the expanse to the remote frame location.
Claim 5
Dependent Claim
58 words
The audio transducer of claim 1 including an elastomeric supporting cord extending through the expanse for attenuating the frequency response of the diaphragm below a predetermined frequency, the cord being fastened a predetermined distance on each side of the expanse to control the extent of expanse movement in the direction of the plane in response to electrical impulses.
Claim 6
Dependent Claim
18 words
The audio transducer of claim 1 wherein the diaphragm webs are each formed of a polyvinyl fluoride film.
Claim 7
Dependent Claim
35 words
The audio transducer of claim 1 including a damping strip attached near the end portion of each web and extending longitudinally therefrom toward the edge of the expanse to limit harmonic distortion of the diaphragm.
Claim 8
Dependent Claim
25 words
The audio transducer of claim 6 wherein the damping strips comprise at least a pair of parallel strips near the end portion of each web.
Claim 9
Dependent Claim
130 words
An audio transducer, comprising: a frame; a diaphragm comprising a pair of elongate resilient webs having intermediate portions joined to each other to form a movable expanse extending substantially in a plane, the expanse being movable in the direction of the plane, the webs each having opposing end portions connected to the intermediate portion, the end portions extending from the intermediate portion in opposite arcs and securing to adjacent frame locations to form a substantially cylindrically shaped web, the frame locations for one web being substantially aligned through the expanse with the frame locations for the other web; coil means attached to the expanse of the diaphragm; magnetic means for producing opposing magnetic fields extending normal to the expanse; and connecting means for conducting electrical impulses to the coil means.
Claim 10
Dependent Claim
130 words
An audio transducer, comprising: a frame; a diaphragm comprising a pair of elongate resilient webs having intermediate portions joined to each other to form a movable expanse extending substantially in a plane, the expanse being movable in the direction of the plane, the webs each having opposing end portions connected to the intermediate portion, the end portions extending from the intermediate portion in opposite arcs and securing to adjacent frame locations to form a substantially cylindrically shaped web, the frame locations for one web being substantially aligned through the expanse with the frame locations for the other web; coil means attached to the expanse of the diaphragm; magnetic means for producing opposing magnetic fields extending normal to the expanse; and connecting means for conducting electrical impulses to the coil means.
Claim 11
Dependent Claim
105 words
An audio transducer, comprising: a frame; a diaphragm comprising a pair of elongate resilient webs having intermediate portions joined to each other to form a movable expanse extending substantially in a plane, the expanse being movable in the direction of the plane, each web having opposing flexible end portions extending from its intermediate portion in opposite arcs to remote adjacent frame locations to form a substantially cylindrically shaped web; coil means attached to the expanse of the diaphragm; magnetic means for producing opposing magnetic fields extending normal to the expanse through the coil means; and connecting means for conducting electrical impulses to the coil means.
Claim 12
Dependent Claim
105 words
An audio transducer, comprising: a frame; a diaphragm comprising a pair of elongate resilient webs having intermediate portions joined to each other to form a movable expanse extending substantially in a plane, the expanse being movable in the direction of the plane, each web having opposing flexible end portions extending from its intermediate portion in opposite arcs to remote adjacent frame locations to form a substantially cylindrically shaped web; coil means attached to the expanse of the diaphragm; magnetic means for producing opposing magnetic fields extending normal to the expanse through the coil means; and connecting means for conducting electrical impulses to the coil means.
Claim 13
Dependent Claim
21 words
The audio transducer of claim 9 wherein the frame includes bottom and top members having a segmented edge to minimize distortion.
Claim 14
Dependent Claim
13 words
The audio transducer of claim 9 wherein the diaphragm comprises polyvinyl fluoride film.
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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) | 1993-02-19 | 1993-08-21 | 1994-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-02-19 | 1997-08-21 | 1998-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-02-19 | 2001-08-21 | 2002-02-20 | $7700.00 | Window Closed / Lapsed |