US4176249A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Deleterious mechanical vibrations from dynamic loudspeaker offset by additional dynamic device
Assignee: Sony Corp
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Filing: 1978-07-24
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Granted: 1979-11-27
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Expires: 1998-07-24
Abstract
Abstract A dynamic loudspeaker comprises first and second device means each having a coil disposed in a magnetic gap formed in a magnetic circuit, a vibratory member driven by a first drive means, and a massive member opposingly disposed to the vibratory member and being driven by a second drive means, whereby reaction force generated by said vibratory member is substantially eliminated by reaction force of said massive member.
Inventors
- 👤 Kiyofumi Inanaga
- 👤 Saburo Egawa
- 👤 Akio Shimizu
- 👤 Keijiro Maeda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 11:59
CPC Classifications
H; H04; H04R; H04R9/00; H04R9/02; H04R9/025; H04R2209/00; H04R2209/027
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
49 words
A dynamic loudspeaker comprising a diaphragm having a voice coil, first drive means for driving said diaphragm to originate sounds, a massive member vibratably coupled to said first drive means, and second drive means for vibrating said massive member so as to eliminate reaction force generated by said diaphragm.
Claim 2
Dependent Claim
49 words
A dynamic loudspeaker comprising a diaphragm having a voice coil, first drive means for driving said diaphragm to originate sounds, a massive member vibratably coupled to said first drive means, and second drive means for vibrating said massive member so as to eliminate reaction force generated by said diaphragm.
Claim 3
Dependent Claim
81 words
A dynamic loudspeaker as set forth in claim 1, wherein said first drive means comprises a first magnetic circuit having a first air gap, said voice coil of said diaphragm being disposed in said air gap, said second drive means comprises a second magnetic circuit having a second air gap, a moving coil formed integrally with said massive member being disposed in said second air gap, and said first and second magnetic circuits being rigidly and mechanically secured with one another.
Claim 4
Dependent Claim
29 words
A dynamic loudspeaker as set forth in claim 2, wherein said second magnetic circuit further comprises a support portion on which said massive member is supported through a damper.
Claim 5
Dependent Claim
59 words
A dynamic loudspeaker as set forth in claim 1, wherein said first and second drive means comprise a common magnetic circuit having first and second air gaps at corresponding positions, said voice coil of said diaphragm being disposed in said first air gap, and a moving coil mounted on said massive member being disposed in said second air gap.
Claim 6
Dependent Claim
22 words
A dynamic loudspeaker as set forth in claim 4, wherein said massive member is supported on said magnetic circuit through a damper.
Claim 7
Dependent Claim
39 words
A dynamic loudspeaker as set forth in claim 1, wherein said massive member is a magnetic circuit having an air gap and a coil disposed in said air gap, and said coil is secured to said first drive means.
Claim 8
Dependent Claim
23 words
A dynamic loudspeaker as set forth in claim 6, wherein said magnetic circuit is supported on said first drive means through a damper.
Claim 9
Dependent Claim
20 words
A dynamic loudspeaker as set forth in claim 6, wherein said magnetic circuit comprises a permanent magnet and a yoke.
Claim 10
Dependent Claim
63 words
A dynamic loudspeaker as set forth in claim 1, wherein said first drive means comprises a permanent magnet, a yoke and an air gap receiving a coil of said diaphragm therein, said second drive means comprises a permanent magnet, a yoke, an air gap receiving a coil of said massive member therein, and said air gaps are located on an equal axial line.
Claim 11
Dependent Claim
75 words
A dynamic loudspeaker as set forth in claim 1, wherein said first drive means comprises a permanent magnet, a yoke, and an air gap receiving a voice coil of said diaphragm therein, said massive member is constituted of a magnetic circuit having a permanent magnet and a yoke, said magnetic circuit having an air gap receiving a coil for driving said magnetic circuit, and said two air gaps are located on an equal axial line.
Claim 12
Dependent Claim
82 words
A dynamic loudspeaker comprising a diaphragm positioned at an opening formed in an enclosure, drive means for driving said diaphragm to originate sounds to the exterior of said enclosure, means coupled to said drive means and having a vibratable massive member disposed in said enclosure, and means for vibrating said massive member in opposite direction from the vibrating direction of said diaphragm, whereby a reaction force generated by said diaphragm is eliminated by a vibration force generated by said last mentioned means.
Claim 13
Dependent Claim
82 words
A dynamic loudspeaker comprising a diaphragm positioned at an opening formed in an enclosure, drive means for driving said diaphragm to originate sounds to the exterior of said enclosure, means coupled to said drive means and having a vibratable massive member disposed in said enclosure, and means for vibrating said massive member in opposite direction from the vibrating direction of said diaphragm, whereby a reaction force generated by said diaphragm is eliminated by a vibration force generated by said last mentioned means.
References Cited (Backward Citations)
US2832843A
Cited
US4109116A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-11-26 | 1983-05-28 | 1983-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-11-26 | 1987-05-28 | 1987-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-11-26 | 1991-05-28 | 1991-11-27 | $7700.00 | Window Closed / Lapsed |