Patent US4488012A successfully refreshed from Google Patents.
US4488012A
Expired / Lapsed
US
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MFB Loudspeaker
Assignee: Pioneer Corp
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Filing: 1983-04-20
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Granted: 1984-12-11
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Expires: 2003-04-20
Abstract
Abstract An MFB loudspeaker comprising a detector element mounted on a diaphragm on a specific position, i.e., a nodal line of a primary resonance mode thereof for generating a voltage proportional to a component indicative the vibratory characteristics of the diaphragm.
Inventors
- 👤 Norio Matsuda
- 👤 Yasumitsu Wada
- 👤 Masaru Chijiiwa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 10:11
CPC Classifications
H; H04; H04R; H04R3/00; H04R3/002; H04R9/00; H04R9/02; H04R9/04
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
67 words
A motional feedback loudspeaker comprising: a diaphragm vibratable for generating reproduced sound, and means for detecting a vibration of said diaphragm, said means for detecting generating a voltage in proportion to a component indicative of said vibration of said diaphragm, and said means for detecting being mounted on said diaphragm at least in the vicinity of a node line of a primary resonance mode of said diaphragm.
Claim 2
Dependent Claim
67 words
A motional feedback loudspeaker comprising: a diaphragm vibratable for generating reproduced sound, and means for detecting a vibration of said diaphragm, said means for detecting generating a voltage in proportion to a component indicative of said vibration of said diaphragm, and said means for detecting being mounted on said diaphragm at least in the vicinity of a node line of a primary resonance mode of said diaphragm.
Claim 3
Dependent Claim
14 words
The loudspeaker of claim 1, said detecting means being mounted on said node line.
Claim 4
Dependent Claim
14 words
The loudspeaker of claim 1, said component including a vibratory acceleration of said diaphragm.
Claim 5
Dependent Claim
14 words
The loudspeaker of claim 1, said component including a vibratory velocity of said diaphragm.
Claim 6
Dependent Claim
14 words
The loudspeaker of claim 1, said component including a vibratory amplitude of said diaphragm.
Claim 7
Dependent Claim
10 words
The loudspeaker of claim 1, said diaphragm being substantially flat.
Claim 8
Dependent Claim
16 words
The loudspeaker of claim 1, said diaphragm being substantially in the form of a rectangular shape.
Claim 9
Dependent Claim
16 words
The loudspeaker of claim 1, said diaphram being substantially in the form of a circular shape.
Claim 10
Dependent Claim
49 words
The loudspeaker of claim 4, further including a driver unit for driving said diaphragm, said detecting means including a detecting coil (12a) wound around a bobbin (12b) fixed to said diaphragm and a magnetic circuit for driving said detecting coil, said magnetic circuit being mounted on said driver unit.
Claim 11
Dependent Claim
54 words
The loudspeaker of claim 5, further including a driver unit for driving said diaphram, said detecting means including a conductive member (12d) mounted on a backside of said diaphragm along with said node line thereof and an associated conductive member (12e) mounted on said driver unit in confronting relationship with said conductive member (12d).
Claim 12
Dependent Claim
55 words
The loudspeaker of claim 1, said detecting means comprising a pickup unit (a) including a pickup element (122), and a pickup element support (121) mounted on said diaphragm, and means for attaching said pickup element onto said pickup element support, said attaching means including a non-solidified layer (123) of adhesives having low hardness and flexibility.
Claim 13
Dependent Claim
11 words
The loudspeaker of claim 11, said pickup element including a ceramic.
Claim 14
Dependent Claim
12 words
The loudspeaker of claim 11, said pickup element including a bimorph cell.
Claim 15
Dependent Claim
13 words
The loudspeaker of claim 11, said pickup element support including a copper plate.
Claim 16
Dependent Claim
13 words
The loudspeaker of claim 11, said pickup element support including a brass plate.
Claim 17
Dependent Claim
11 words
The loudspeaker of claim 11, said adhesives including a silicone adhesive.
Claim 18
Dependent Claim
98 words
The loudspeaker of claim 1, said diaphragm including at least one small projecting wall (115, 117) having a cutaway support for holding with adhesives an end portion of a tinsel cord connected to an input terminal of the loudspeaker, said end portion of said tinsel cord being connected to a lead line of a voice coil of said loudspeaker by soldering, said loudspeaker further including a porous sound absorbing member (109) interposed between said diaphram and a peripheral edge of said loudspeaker, said small projection wall being located in the vicinity of an outer periphery of said diaphram.
Claim 19
Dependent Claim
49 words
The loudspeaker of claim 1, further including a voice coil, said diaphragm including at least one annular projection wall (104) extending from a backside of said diaphragm, said diaphragm including on its outer surface an annular recess groove within which at least one pin gate for molding is located.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-12-11 | 1988-06-11 | 1988-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-12-11 | 1992-06-11 | 1992-12-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-12-11 | 1996-06-11 | 1996-12-11 | $7700.00 | Window Closed / Lapsed |