Patent US5642333A successfully refreshed from Google Patents.
US5642333A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electroacoustic transducer and method of winding coil therein
Assignee: Star Micronics Co Ltd
•
Filing: 1995-02-15
•
Granted: 1997-06-24
•
Expires: 2015-02-15
Abstract
Abstract The present invention provides an electroacoustic transducer which can increase the winding efficiency of a coil on a pole and allows the automation of a coil winding process. The present invention relates to an electroacoustic transducer for vibrating a diaphragm by a magnetic field generated in response to an inputted electric signal to convert the electric signal into sound. The coil is wound around the pole along its entire length. However, at the pole tip, the coil is formed to have an outwardly diverging, frusto-conical recess that exposes the pole tip.
Inventors
- 👤 Yoshio Imahori
- 👤 Kazuhiro Yamaguchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 19:25
CPC Classifications
B; B65; B65H; B65H54/00; B65H54/56; B65H54/58; G; G10; G10K; G10K9/00; G10K9/12; G10K9/13; H; H04; H04R; H04R11/00; H04R11/06; H04R9/00; H04R9/02; H04R9/04; H04R9/046; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49005; Y10T29/4902; Y10T29/49071; Y10T29/4908
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
205 words
An electroacoustic transducer for vibrating a diaphragm by a magnetic field generated in response to an inputted electric signal to convert said electric signal into sound, the transducer comprising: a pole piece portion composed of a yoke and a pole provided on an upper surface of said yoke, wherein said yoke of said pole piece portion is flat and is disposed at a rear side of a housing, and said pole stands on the upper surface of said yoke and is columnar, and wherein a gap is defined and disposed between an end surface of said pole and said diaphragm; a coil wound around said pole of said pole piece portion so that a peripheral surface of a tip end of said pole is exposed inside an inner top surface of said coil, and an outer top surface of said coil is flush with an end surface of said pole or adjacent to the end surface of said pole but higher than the lowest height of the inner top surface of said coil; and an annular magnet which is provided on the upper surface of said yoke, said magnet applying a bias magnetic field to said diaphragm so as to magnetize and hold the same.
Claim 2
Dependent Claim
205 words
An electroacoustic transducer for vibrating a diaphragm by a magnetic field generated in response to an inputted electric signal to convert said electric signal into sound, the transducer comprising: a pole piece portion composed of a yoke and a pole provided on an upper surface of said yoke, wherein said yoke of said pole piece portion is flat and is disposed at a rear side of a housing, and said pole stands on the upper surface of said yoke and is columnar, and wherein a gap is defined and disposed between an end surface of said pole and said diaphragm; a coil wound around said pole of said pole piece portion so that a peripheral surface of a tip end of said pole is exposed inside an inner top surface of said coil, and an outer top surface of said coil is flush with an end surface of said pole or adjacent to the end surface of said pole but higher than the lowest height of the inner top surface of said coil; and an annular magnet which is provided on the upper surface of said yoke, said magnet applying a bias magnetic field to said diaphragm so as to magnetize and hold the same.
Claim 3
Dependent Claim
24 words
An electroacoustic transducer according to claim 1, wherein said inner top surface of said coil is conical and said outer top surface is flat.
Claim 4
Dependent Claim
123 words
An electroacoustic transducer for vibrating a diaphragm in response to an electromagnetic field generated in response to an inputted electric signal for conversion to an audio signal, the transducer comprising: a flat supporting yoke located at an end of a transducer housing; a cylindrical pole extending at a first end thereof from a surface of the yoke, the surface being internal of the housing; a gap existing between a second end of the pole and the diaphragm; a coil wound around the pole and having (a) a first transverse end coplanar with the yoke, and (b) a second transverse end substantially coplanar with the second end of the pole and including an axial coil recess for exposing the pole tip in the recess.
Claim 5
Dependent Claim
123 words
An electroacoustic transducer for vibrating a diaphragm in response to an electromagnetic field generated in response to an inputted electric signal for conversion to an audio signal, the transducer comprising: a flat supporting yoke located at an end of a transducer housing; a cylindrical pole extending at a first end thereof from a surface of the yoke, the surface being internal of the housing; a gap existing between a second end of the pole and the diaphragm; a coil wound around the pole and having (a) a first transverse end coplanar with the yoke, and (b) a second transverse end substantially coplanar with the second end of the pole and including an axial coil recess for exposing the pole tip in the recess.
Claim 6
Dependent Claim
22 words
An electroacoustic transducer as set forth in claim 3 wherein the recess is in the shape of an outwardly diverging frusto-conical recess.
References Cited (Backward Citations)
US2978669A
Cited
US5416751A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2000-06-23 | 2000-12-23 | 2001-06-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-06-23 | 2004-12-23 | 2005-06-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-06-23 | 2008-12-23 | 2009-06-24 | $7700.00 | Window Closed / Lapsed |