US4209669A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pick-up cartridge
Assignee: Nippon Columbia Co Ltd
•
Filing: 1978-12-21
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Granted: 1980-06-24
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Expires: 1998-12-21
Abstract
Abstract A moving magnet type pick-up cartridge is disclosed. Coils arranged around a moving magnet have no yoke to prevent the generation of distortion by a yoke.
Inventors
- 👤 Hideaki Hayashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 13:37
CPC Classifications
H; H04; H04R; H04R11/00; H04R11/08; H04R11/12
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
80 words
A pick-up cartridge comprising: (a) a cantilever having a stylus at its one end and a magnet at its other end, said magnet being magnetized in the axial direction of said cantilever, said cantilever, said stylus and said magnet forming a vibrating system; (b) a frame made of non-magnetic material; and (c) a coil fixed to said frame, said frame being so located that when said magnet is moved said coil intersects a closed magnetic flux originated from said magnet.
Claim 2
Dependent Claim
80 words
A pick-up cartridge comprising: (a) a cantilever having a stylus at its one end and a magnet at its other end, said magnet being magnetized in the axial direction of said cantilever, said cantilever, said stylus and said magnet forming a vibrating system; (b) a frame made of non-magnetic material; and (c) a coil fixed to said frame, said frame being so located that when said magnet is moved said coil intersects a closed magnetic flux originated from said magnet.
Claim 3
Dependent Claim
30 words
A pick-up cartridge as claimed in claim 1, in which said magnet is a disc and said frame is made of a cylinder which is disposed coaxial with said magnet.
Claim 4
Dependent Claim
32 words
A pick-up cartridge as claimed in claim 1, in which said frame having said coil wound thereon is made of a semi-cylinder and said vibrating system is inserted into said semi-cylindrical frame.
Claim 5
Dependent Claim
20 words
A pick-up cartridge as claimed in claim 3, in which said coil is wound on said cylindrical frame in cross-shape.
Claim 6
Dependent Claim
24 words
A pick-up cartridge as claimed in claim 2, in which said cylindrical frame has provided with a portion on which said coil is wound.
Claim 7
Dependent Claim
28 words
A pick-up cartridge as claimed in claim 2, in which said coil is made of a hollow coil and said hollow coil is fixed to said cylindrical frame.
Claim 8
Dependent Claim
35 words
A pick-up cartridge as claimed in claim 2, in which a pin is planted on said cylindrical frame and said coil is made of a hollow coil, said hollow coil being supported by said pin.
Claim 9
Dependent Claim
33 words
A pick-up cartridge as claimed in claim 2, in which a pin is planted on said cylindrical frame, a bobbin is engaged with said pin, and said coil is wound on said bobbin.
Claim 10
Dependent Claim
31 words
A pick-up cartridge as claimed in claim 1, in which a disc is attached to the other end of said cantilever, and said magnet is attached to said disc in cross-shape.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-06-24 | 1983-12-24 | 1984-06-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-06-24 | 1987-12-24 | 1988-06-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-06-24 | 1991-12-24 | 1992-06-24 | $7700.00 | Window Closed / Lapsed |