US5148492A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Diaphragm of dynamic microphone
Assignee: Audio Technica KK
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Filing: 1991-03-14
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Granted: 1992-09-15
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Expires: 2011-03-14
Abstract
Abstract There is a dynamic microphone comprising: a diaphragm which can vibrate by an acoustic wave and a voice coil which is joined to the diaphragm so as to transverse a magnetic field formed by the magnet and can vibrate integratedly with the diaphragm, wherein a number of peripheral treatment agents for damping are coated in a dot shape or a discontinuous stripe shape at intervals onto either one of the front surface and the back surface of the portion of the diaphragm excluding the center dome. With the above construction, a change in stiffness of the diaphragm by the peripheral treatment agents is extremely reduced, it is prevented that the diaphragm resonates at a special frquency, a sudden attenuation of the low frequency limit is prevented, and a low sound can be also certainly collected.
Inventors
- 👤 Shigeru Uzawa
- 👤 Yoshio Kikuti
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 13:22
CPC Classifications
H; H04; H04R; H04R9/00; H04R9/08; H04R1/00; H04R1/20; H04R1/22; H04R1/222
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
190 words
A dynamic microphone comprising: a casing; a diaphragm which is arranged in front of the casing and can vibrate in accordance with a vibration from a sound source and having a center dome as a center portion of the diaphragm and an edge portion as an outer peripheral portion of the center dome; a magnet having a front surface and a rear surface, said magnet located behind the diaphragm; a pole piece joined between the front surface of the magnet and the diaphragm; a yoke plate joined to the rear surface of the magnet; a voice coil which is arranged in a narrow gap between the outer peripheral surface of the pole piece and the yoke plate and is joined to the diaphragm so as to transverse a magnetic field formed by the magnet and can vibrate in an integrated manner with the diaphragm; damping means which is constructed in a manner such that a number of peripheral treatment agents are applied to form a plurality of dots onto either one of the front surface or the back surface of the portions of the diaphragm excluding the center dome portion.
Claim 2
Dependent Claim
190 words
A dynamic microphone comprising: a casing; a diaphragm which is arranged in front of the casing and can vibrate in accordance with a vibration from a sound source and having a center dome as a center portion of the diaphragm and an edge portion as an outer peripheral portion of the center dome; a magnet having a front surface and a rear surface, said magnet located behind the diaphragm; a pole piece joined between the front surface of the magnet and the diaphragm; a yoke plate joined to the rear surface of the magnet; a voice coil which is arranged in a narrow gap between the outer peripheral surface of the pole piece and the yoke plate and is joined to the diaphragm so as to transverse a magnetic field formed by the magnet and can vibrate in an integrated manner with the diaphragm; damping means which is constructed in a manner such that a number of peripheral treatment agents are applied to form a plurality of dots onto either one of the front surface or the back surface of the portions of the diaphragm excluding the center dome portion.
Claim 3
Dependent Claim
33 words
A dynamic microphone according to claim 1, wherein the peripheral treatment agents comprising a solution in which either one of a synthetic rubber or an acrylic rubber is mixed with an organic solvent.
Claim 4
Dependent Claim
20 words
A dynamic microphone according to claim 1 wherein the plurality of dots are in a discontinuous strip shape at intervals.
References Cited (Backward Citations)
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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) | 1995-09-15 | 1996-03-16 | 1996-09-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-09-15 | 2000-03-16 | 2000-09-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-09-15 | 2004-03-16 | 2004-09-15 | $7700.00 | Window Closed / Lapsed |