US4010334A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Moving magnet contact acoustic transducer
Assignee: Individual
•
Filing: 1975-01-27
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Granted: 1977-03-01
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Expires: 1995-01-27
Abstract
Abstract A dynamic acoustic transducer device of small, compact, highly efficient design, wherein a vibratable diaphragm is supported in an open side of a casing, a pair of permanent magnets being secured to the diaphragm for vibrational movement therewith, the magnets extending into the casing and being respectively surrounded by an electric coil winding which is isolated against vibrations of the diaphragm, the coils being connectable with a signal circuit. When the dynamic transducer comprises a microphone, the device is susceptible of mounting in an operating position by adhesively securing the outer surface of the diaphragm to a vibratable surface of a musical instrument, or other vibratable medium so that the relative movements between the magnets and coils in response to the sensed vibrations will function to produce a modulated output signal capable of being amplified and coupled to a loudspeaker. When the transducer is embodied in a device for the generation of sound waves, for example, in a loudspeaker system, a modulated electric signal is utilized to energize the coils and by interaction with the magnets to drive the diaphragm.
Inventors
- 👤 James K. Demeter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:58
CPC Classifications
H; H04; H04R; H04R11/00; H04R11/04; H04R1/00; H04R1/46
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
109 words
A dynamic acoustic transducer device, comprising: a. a rigid body defining a support; b. an elongated permanent magnet element; c. an electric coil element surrounding said magnet and having terminals for connection to a signal circuit, said magnet having pole ends axially projecting beyond the ends of said coil; d. a flat rigid diaphragm having its periphery elastically connected to said support; e. said permanent magnet element being wholly positioned on one side of said diaphragm and being attached thereto for vibrational axial movements therewith; and f. elastic means supporting said electric coil on said support and constituting means resiliently isolating said coil from vibrational movements of said diaphragm.
Claim 2
Dependent Claim
109 words
A dynamic acoustic transducer device, comprising: a. a rigid body defining a support; b. an elongated permanent magnet element; c. an electric coil element surrounding said magnet and having terminals for connection to a signal circuit, said magnet having pole ends axially projecting beyond the ends of said coil; d. a flat rigid diaphragm having its periphery elastically connected to said support; e. said permanent magnet element being wholly positioned on one side of said diaphragm and being attached thereto for vibrational axial movements therewith; and f. elastic means supporting said electric coil on said support and constituting means resiliently isolating said coil from vibrational movements of said diaphragm.
Claim 3
Dependent Claim
28 words
A device according to claim 1, wherein said support is a hollow casing said electric coil being supported within said casing by a member fabricated from foam rubber.
Claim 4
Dependent Claim
39 words
A device according to claim 2, wherein said foam rubber member comprises an insert having a cylindrical opening in which said coil element is coaxially supported in a position spaced between said diaphragm and the bottom of said casing.
Claim 5
Dependent Claim
28 words
A device according to claim 1, wherein said diaphragm has an outer flat surface adapted for face securement to a vibration transmitting medium for direct mechanical vibration thereby.
Claim 6
Dependent Claim
22 words
A device according to claim 4, in which said diaphragm has an inner surface rigidly connected to said one of said elements.
Claim 7
Dependent Claim
23 words
A device according to claim 1, wherein the diaphragm comprises a laminated structure with flat strips having substantially coextensive surface areas of engagement.
Claim 8
Dependent Claim
27 words
A device according to claim 6 in which said laminated structure is composed of a metallic strip sandwiched between outer and inner strips of a paper-like material.
Claim 9
Dependent Claim
40 words
A device according to claim 1, wherein one end of said magnet is attached to said diaphragm; and including means carried by the other end of said magnet for guidingly maintaining the axial position of the magnet within said coil.
Claim 10
Dependent Claim
18 words
A device according to claim 8, wherein the guiding means comprises a tubular sleeve of molded resilient material.
Claim 11
Dependent Claim
15 words
A device according to claim 9, wherein the sleeve is of a silicon rubber material.
Claim 12
Dependent Claim
45 words
A device according to claim 8, in which the coil element is supported within a surrounding casing; and said guiding means comprises a post of elastic material secured to an adjacent wall of said casing, and with said other end of the magnet seated therein.
Claim 13
Dependent Claim
32 words
A device according to claim 11, wherein said post is of a sponge rubber material, and is under compression, whereby to provide a controlled damping effect for vibrational movements of said magnet.
Claim 14
Dependent Claim
138 words
A dynamic acoustic transducer device, comprising: a. a hollow casing having an open side; b. a vibratable diaphragm supported in the open side of said casing, said diaphragm including an elongated metallic strip; c. a pair of elongate permanent magnets secured at one end to said diaphragm in spaced relation and projecting at a right angle thereto into said casing, the connected ends of said magnets being of unlike polarity, and the metallic strip of said diaphragm providing a keeper for said magnets; d. a pair of electric coil windings in said casing respectively surrounding said magnets and being adapted for coupling with a signal circuit, said coil windings being connected in series and having their windings in reversed phase relation; and e. means for supporting and isolating said coil windings with respect to vibrations of said diaphragm.
Claim 15
Dependent Claim
138 words
A dynamic acoustic transducer device, comprising: a. a hollow casing having an open side; b. a vibratable diaphragm supported in the open side of said casing, said diaphragm including an elongated metallic strip; c. a pair of elongate permanent magnets secured at one end to said diaphragm in spaced relation and projecting at a right angle thereto into said casing, the connected ends of said magnets being of unlike polarity, and the metallic strip of said diaphragm providing a keeper for said magnets; d. a pair of electric coil windings in said casing respectively surrounding said magnets and being adapted for coupling with a signal circuit, said coil windings being connected in series and having their windings in reversed phase relation; and e. means for supporting and isolating said coil windings with respect to vibrations of said diaphragm.
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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) | 1980-02-29 | 1980-08-30 | 1981-03-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-02-29 | 1984-08-30 | 1985-03-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-02-29 | 1988-08-30 | 1989-03-01 | $7700.00 | Window Closed / Lapsed |