Patent US2665737A successfully refreshed from Google Patents.
Patent US3733445A successfully refreshed from Google Patents.
US3733445A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Inertial reaction transducers
Assignee: DYNA MAGNETIC DEVICES Inc
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Filing: 1971-02-17
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Granted: 1973-05-15
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Expires: 1991-02-17
Abstract
Abstract An acoustic transducer having good speech intelligibility with inherent significant suppression of ambient noise. Incorporates inertial mass reaction in efficient, compact and lightweight arrangement. In one form includes a predetermined weight or block suspended by a vibratory diaphragm and linked to the electromechanical or motor section, to impart a specific upper resonant frequency. In another, the weight is mounted directly upon the armature. Effective over a relatively wide speech band. Has a single resonant frequency that is readily controlled and manufactured. Provides inherent roll-off beyond this frequency to extend response, yet substantially reduce noise. Applications include: contact head microphone; in-mask microphone; in-ear receiver.
Inventors
- 👤 G Sebesta
- 👤 R Carlisle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 06:20
CPC Classifications
H; H04; H04R; H04R1/00; H04R1/14; H04R1/46; H04R11/00
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
179 words
A compact inertial transducer comprising a housing; an electromagnetic assembly within said housing, said assembly being attached to the housing and including permanent magnet means, an armature having a vibratory arm the free end of which extends close to said magnet means and forms a magnetic gap therewith, a pole piece structure containing said magnet means, and a winding in electromagnetic coaction with said armature; a member of relatively minor dimensions and predetermined mass; a flexible strip of elongated form mounting said member apart from said armature arm fully within said housing and in inertial vibratory relation with respect to said housing, the opposite ends of said strip being affixed to said housing and thereby compliantly coupling the member to the housing and its attached assembly, the sides of said strip being unattached, and means mechanically interconnecting said armature arm and member to vibrate in substantial phase relation; the mass of said member and the compliance of said strip and arm being proportioned to provide a significant response in the audible frequency range by the transducer through inertial reaction.
Claim 2
Dependent Claim
179 words
A compact inertial transducer comprising a housing; an electromagnetic assembly within said housing, said assembly being attached to the housing and including permanent magnet means, an armature having a vibratory arm the free end of which extends close to said magnet means and forms a magnetic gap therewith, a pole piece structure containing said magnet means, and a winding in electromagnetic coaction with said armature; a member of relatively minor dimensions and predetermined mass; a flexible strip of elongated form mounting said member apart from said armature arm fully within said housing and in inertial vibratory relation with respect to said housing, the opposite ends of said strip being affixed to said housing and thereby compliantly coupling the member to the housing and its attached assembly, the sides of said strip being unattached, and means mechanically interconnecting said armature arm and member to vibrate in substantial phase relation; the mass of said member and the compliance of said strip and arm being proportioned to provide a significant response in the audible frequency range by the transducer through inertial reaction.
Claim 3
Dependent Claim
34 words
An inertial transducer as claimed in claim 1, further including a frame supported in the housing, said flexible strip being secured to said frame in a vibratory mode and mounting said member centrally thereof.
Claim 4
Dependent Claim
41 words
An inertial transducer as claimed in claim 1, in which said member is maintained substantially parallel to the vibratory arm, and a drive pin arranged perpendicularly to said member and connecting it to said armature arm substantially centrally of the assembly.
Claim 5
Dependent Claim
68 words
An inertial transducer as claimed in claim 3, in which the said armature is in U-form, the end of one of the armature arms being attached to said pole piece structure, the other armature arm being the said vibratory one that coacts with said magnet means, thereby establishing a low reluctance magnetic flux path between said pole piece structure and the free end of said other armature arm.
Claim 6
Dependent Claim
39 words
An inertial transducer as claimed in claim 4, in which the ratio of the mass of said member plus that of the vibratory arm to the mass of the remainder of the transducer is of the order of 0.10.
References Cited (Backward Citations)
US3076062A
Cited
US3427579A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-05-14 | 1976-11-13 | 1977-05-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-14 | 1980-11-13 | 1981-05-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-14 | 1984-11-13 | 1985-05-15 | $7700.00 | Window Closed / Lapsed |