US3683248A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Directly driven turntable apparatus for phonograph records
Assignee: Panasonic Holdings Corp
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Filing: 1971-03-24
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Granted: 1972-08-08
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Expires: 1991-03-24
Abstract
Abstract A turntable apparatus driven directly by an electronically commutated motor having a speed of 33 1/3 rpm or 45 rpm which decreases the rumble and the wow and flutter to a minimum and assures these characteristics for a long time, the changing and adjusting of the turntable speed are carried out electronically without any mechanical mechanism, and the turntable is selfstarting and can be built in a short time.
Inventors
- 👤 Kazutsugu Kobayashi
- 👤 Yoshiaki Igarashi
- 👤 Hisayuki Matsumoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 05:48
CPC Classifications
H; H02; H02K; H02K29/00; H02K29/06; H02K29/12; H02P; H02P6/00; H02P6/10
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
235 words
A directly driven turntable apparatus for phonograph records comprising a rotor axis means having a radial bearing portion, a thrust bearing portion, and a spindle portion for said phono-graph record; a turntable; a support member; a stator axis means, comprising a radial bearing portion and a thrust bearing portion, being positioned in said support member, and constructing radial and thrust bearings in association with said rotor axis means; a permanent magnet; a rotor yoke secured to said rotor axis means and having a magnet holding portion for said magnet; a position detecting means comprising a position detecting rotor means and a position detecting stator means that are positioned inside said magnet, said position detecting rotor means being coupled to said rotor axis means and rotatable with said rotor; stator windings; a stator windings positioning means secured to said support member and supporting said stator windings in regular positions, said position detecting means secured to said stator windings positioning means; speed regulating means comprising means for detecting the rotaTional speed of said rotor and producing an electric signal corresponding to the rotational speed of said rotor, means for producing an electric reference signal corresponding to the predetermined speed, and means for controlling the current to said stator windings for controlling the speed of said turntable; and a panel board having a moment of inertia larger than 200 Kg cm2 and having said support member secured thereto.
Claim 2
Dependent Claim
235 words
A directly driven turntable apparatus for phonograph records comprising a rotor axis means having a radial bearing portion, a thrust bearing portion, and a spindle portion for said phono-graph record; a turntable; a support member; a stator axis means, comprising a radial bearing portion and a thrust bearing portion, being positioned in said support member, and constructing radial and thrust bearings in association with said rotor axis means; a permanent magnet; a rotor yoke secured to said rotor axis means and having a magnet holding portion for said magnet; a position detecting means comprising a position detecting rotor means and a position detecting stator means that are positioned inside said magnet, said position detecting rotor means being coupled to said rotor axis means and rotatable with said rotor; stator windings; a stator windings positioning means secured to said support member and supporting said stator windings in regular positions, said position detecting means secured to said stator windings positioning means; speed regulating means comprising means for detecting the rotaTional speed of said rotor and producing an electric signal corresponding to the rotational speed of said rotor, means for producing an electric reference signal corresponding to the predetermined speed, and means for controlling the current to said stator windings for controlling the speed of said turntable; and a panel board having a moment of inertia larger than 200 Kg cm2 and having said support member secured thereto.
Claim 3
Dependent Claim
250 words
A directly driven turntable apparatus for phonograph records comprising a rotor axis means having a radial bearing portion, a thrust bearing portion, and a spindle portion for said phonograph record; a turntable; a support member; a stator axis means, comprising a radial bearing portion and a thrust bearing portion, being positioned in said support member, and constructing radial and thrust bearings in association with said rotor axis means; a permanent magnet having poles in the number of from ten to one hundred; a rotor yoke secured to said rotor axis means and having a magnet holding portion for said magnet; a position detecting means comprising a position detecting rotor means and a position detecting stator means that are positioned inside said magnet, said position detecting rotor means being coupled to said rotor axis means and rotatable with said rotor; stator windings; a stator windings positioning means secured to said support member and supporting said stator windings in regular positions, said position detecting means secured to said stator windings positioning means, a power source including switching means for energizing said stator windings in accordance with position signals provided by said position detecting stator means, and a speed regulating means comprising means for detecting the rotational speed of said rotor and producing an electric signal corresponding to the rotational speed of said rotor, means for producing an electric reference signal corresponding to the predetermined speed, and means for controlling the current to said stator windings for controlling the speed of said turntable.
Claim 4
Dependent Claim
250 words
A directly driven turntable apparatus for phonograph records comprising a rotor axis means having a radial bearing portion, a thrust bearing portion, and a spindle portion for said phonograph record; a turntable; a support member; a stator axis means, comprising a radial bearing portion and a thrust bearing portion, being positioned in said support member, and constructing radial and thrust bearings in association with said rotor axis means; a permanent magnet having poles in the number of from ten to one hundred; a rotor yoke secured to said rotor axis means and having a magnet holding portion for said magnet; a position detecting means comprising a position detecting rotor means and a position detecting stator means that are positioned inside said magnet, said position detecting rotor means being coupled to said rotor axis means and rotatable with said rotor; stator windings; a stator windings positioning means secured to said support member and supporting said stator windings in regular positions, said position detecting means secured to said stator windings positioning means, a power source including switching means for energizing said stator windings in accordance with position signals provided by said position detecting stator means, and a speed regulating means comprising means for detecting the rotational speed of said rotor and producing an electric signal corresponding to the rotational speed of said rotor, means for producing an electric reference signal corresponding to the predetermined speed, and means for controlling the current to said stator windings for controlling the speed of said turntable.
Claim 5
Dependent Claim
272 words
A directly driven turntable apparatus for phonograph records comprising a rotor axis means having a radial bearing portion, a thrust bearing portion, and a spindle portion for said phonograph record; a turntable; a support member; a stator axis means, comprising a radial bearing portion and a thrust bearing portion, being positioned in said support member, and constructing radial and thrust bearings in association with said rotor axis means; a permanent magnet having poles in the number of from ten to one hundred; a rotor yoke secured to said rotor axis means and having a magnet holding portion for said magnet; a position detecting means comprising a position detecting rotor means and a position detecting stator means that are positioned inside said magnet. said position detecting rotor means being coupled to said rotor axis means and rotatable with said rotor; stator windings; a stator windings positioning means secured to said support member and supporting said stator windings in regular positions, said position detecting means secured to said stator windings positioning means; a power source including switching means for energizing said stator windings in accordance with position signals provided by said position detecting stator means; a speed regulating means comprising means for detecting the rotational speed of said rotor and producing an electric signal corresponding to the rotational speed of said rotor, means for producing an electric reference signal corresponding to the predetermined speed, and means for controlling the current to said stator windings for controlling the speed of said turntable; and a panel board having a moment of inertia larger than 200 Kg cm2, said support member being secured on said panel board.
Claim 6
Dependent Claim
272 words
A directly driven turntable apparatus for phonograph records comprising a rotor axis means having a radial bearing portion, a thrust bearing portion, and a spindle portion for said phonograph record; a turntable; a support member; a stator axis means, comprising a radial bearing portion and a thrust bearing portion, being positioned in said support member, and constructing radial and thrust bearings in association with said rotor axis means; a permanent magnet having poles in the number of from ten to one hundred; a rotor yoke secured to said rotor axis means and having a magnet holding portion for said magnet; a position detecting means comprising a position detecting rotor means and a position detecting stator means that are positioned inside said magnet. said position detecting rotor means being coupled to said rotor axis means and rotatable with said rotor; stator windings; a stator windings positioning means secured to said support member and supporting said stator windings in regular positions, said position detecting means secured to said stator windings positioning means; a power source including switching means for energizing said stator windings in accordance with position signals provided by said position detecting stator means; a speed regulating means comprising means for detecting the rotational speed of said rotor and producing an electric signal corresponding to the rotational speed of said rotor, means for producing an electric reference signal corresponding to the predetermined speed, and means for controlling the current to said stator windings for controlling the speed of said turntable; and a panel board having a moment of inertia larger than 200 Kg cm2, said support member being secured on said panel board.
Claim 7
Dependent Claim
26 words
A directly driven turntable apparatus for phonograph recOrds as claimed in claim 3, wherein said turntable has a moment of inertia larger than 100 Kg cm2.
Claim 8
Dependent Claim
261 words
A directly driven turntable apparatus for phonograph records comprising a rotor axis means having a radial bearing portion, a thrust bearing portion, and a spindle portion for said phonograph record; a turntable; a support member; a stator axis means, comprising a radial bearing portion and a thrust bearing portion, being positioned in said support member, and constructing radial and thrust bearings in association with said rotor axis means; a permanent magnet; a rotor yoke secured to said rotor axis means and having a magnet holding portion for said magnet; stator windings; a stator windings positioning means secured to said support member, having said stator windings arranged to the outside thereof; a position detecting rotor means having multiple teeth and being arranged to rotate together with said rotor; a position detecting stator means comprising a oscillator, primary windings connected to said oscillator, and secondary windings mounted adjacent to said primary windings, said position detecting stator means being arranged at the inside of said stator windings positioning means, said position detecting rotor means being arranged to rotate within said position detecting stator means; a power source including switching means for energizing said stator windings in accordance with position signals provided by said position detecting stator means; and a speed regulating means comprising means for detecting the rotational speed of said rotor and producing an electric signal corresponding to the rotational speed of said rotor, means for producing an electric reference signal corresponding to the predetermined speed, and means for controlling the current to said stator windings for controlling the speed of said turntable.
Claim 9
Dependent Claim
261 words
A directly driven turntable apparatus for phonograph records comprising a rotor axis means having a radial bearing portion, a thrust bearing portion, and a spindle portion for said phonograph record; a turntable; a support member; a stator axis means, comprising a radial bearing portion and a thrust bearing portion, being positioned in said support member, and constructing radial and thrust bearings in association with said rotor axis means; a permanent magnet; a rotor yoke secured to said rotor axis means and having a magnet holding portion for said magnet; stator windings; a stator windings positioning means secured to said support member, having said stator windings arranged to the outside thereof; a position detecting rotor means having multiple teeth and being arranged to rotate together with said rotor; a position detecting stator means comprising a oscillator, primary windings connected to said oscillator, and secondary windings mounted adjacent to said primary windings, said position detecting stator means being arranged at the inside of said stator windings positioning means, said position detecting rotor means being arranged to rotate within said position detecting stator means; a power source including switching means for energizing said stator windings in accordance with position signals provided by said position detecting stator means; and a speed regulating means comprising means for detecting the rotational speed of said rotor and producing an electric signal corresponding to the rotational speed of said rotor, means for producing an electric reference signal corresponding to the predetermined speed, and means for controlling the current to said stator windings for controlling the speed of said turntable.
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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) | 1975-08-08 | 1976-02-07 | 1976-08-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-08 | 1980-02-07 | 1980-08-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-08 | 1984-02-07 | 1984-08-08 | $7700.00 | Window Closed / Lapsed |