US3973080A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Playback device for a disc-shaped record carrier with transducer lifting for changing playback groove for fast, slow or stop effects
Assignee: Deutsche Thomson OHG
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Filing: 1974-04-11
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Granted: 1976-08-03
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Expires: 1994-04-11
Abstract
Abstract A playback device for disc-shaped record carriers containing video signals stored in the grooves thereof which includes an arrangement which, in response to an applied power pulse, displaces the pickup, during playback, by a number of groove widths transversely to the direction of the groove.
Inventors
- 👤 Gerhard Dickopp
- 👤 Benno Jahnel
- 👤 Wolfgang Rainer
- 👤 Paul Ludwig Dummen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 06:46
CPC Classifications
G; G11; G11B; G11B3/00; G11B3/02; G11B3/10; G11B3/12; G11B3/125; G11B3/127; G11B17/00; G11B17/02; G11B17/022; G11B17/028; G11B21/00; G11B21/02; G11B27/00; G11B27/10; G11B27/102; G11B27/105; G11B27/19; G11B27/28; G11B27/30; G11B3/34; G11B3/36; H; H04; H04N; H04N5/00; H04N5/76; H04N5/7605; G11B2220/00; G11B2220/20; Y; Y10; Y10S; Y10S358/00; Y10S358/907
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
139 words
In a playback device for a disc-shaped record carrier containing signals stored in the grooves thereof, said device including means for rotating the record carrier, a movable carriage, means for moving said carriage in a direction radially to the record during playback, a pickup having a stylus arranged to contact one surface of the record carrier and engage in a groove thereof, and a mount which is connected to said carriage, for elastically supporting said pickup, the improvement comprising: means for providing power pulses at desired times during playback; and energy pulse generating means responsive to said power pulses for applying an energy pulse to said pickup for lifting said pickup, displacing said pickup by a desired number of groove widths transversely to the direction of the groove and then returning said pickup to said surface of said carrier.
Claim 2
Dependent Claim
139 words
In a playback device for a disc-shaped record carrier containing signals stored in the grooves thereof, said device including means for rotating the record carrier, a movable carriage, means for moving said carriage in a direction radially to the record during playback, a pickup having a stylus arranged to contact one surface of the record carrier and engage in a groove thereof, and a mount which is connected to said carriage, for elastically supporting said pickup, the improvement comprising: means for providing power pulses at desired times during playback; and energy pulse generating means responsive to said power pulses for applying an energy pulse to said pickup for lifting said pickup, displacing said pickup by a desired number of groove widths transversely to the direction of the groove and then returning said pickup to said surface of said carrier.
Claim 3
Dependent Claim
42 words
A playback device as defined in claim 1 wherein said power pulse providing means includes a pulse shaping means for causing the power pulses applied to said energy pulse generating means to have a steep leading edge and a flat trailing edge.
Claim 4
Dependent Claim
27 words
A playback device as defined in claim 1 wherein said power pulse providing means includes means for varying the sequence of the pulses imparted to said pickup.
Claim 5
Dependent Claim
41 words
A playback device as defined in claim 1 including means connected to said power pulse providing means and said means for rotating the disc for synchronizing the times at which said power pulses are provided with the rotation of the disc.
Claim 6
Dependent Claim
33 words
A playback device as defined in claim 1 wherein said power pulse providing means is responsive to signals which are contained in the recorded signal and which are correlated with the groove circumference.
Claim 7
Dependent Claim
24 words
A playback device as defined in claim 1 wherein said power pulse providing means includes means for varying the intensity of the power pulses.
Claim 8
Dependent Claim
81 words
A playback device as defined in claim 1 wherein said energy pulse generating means includes: a small soft iron plate mounted on said pickup; and an electromagnet which is attached to said mount and responsive to the output of said power pulse providing means, said electromagnet being positioned adjacent said soft iron plate so that upon receipt of a power pulse from said power pulse providing means a force transverse to the direction of the groove is applied to said pickup.
Claim 9
Dependent Claim
41 words
A playback device as defined in claim 1 wherein said mount includes an arm member from which said pickup is elastically suspended and wherein said energy pulse generating means comprises a piezoceramic element connected between said pickup and said arm member.
Claim 10
Dependent Claim
49 words
A playback device as defined in claim 1 wherein said energy pulse generating means includes first and second means, responsive to the output of said power pulse providing means, for applying respective forces to said pickup in different directions which are each perpendicular to the direction of the groove.
Claim 11
Dependent Claim
35 words
A playback device as defined in claim 9 wherein said first and second means each form an angle of 135° with the direction of the contact pressure exerted by said pickup on the record carrier.
Claim 12
Dependent Claim
48 words
A playback device as defined in claim 10 wherein said energy pulse generating means further includes a small soft iron plate mounted on said pickup, and wherein each of said first and second means includes an electromagnet which is attached to said mount and positioned adjacent said plate.
Claim 13
Dependent Claim
38 words
A playback device as defined in claim 1 wherein said stored signals are television signals and wherein each complete revolution of a groove contains a field or a constant whole number multiple of fields of a television picture.
Claim 14
Dependent Claim
17 words
A playback device as defined in claim 12 wherein the record carrier contains a spiral-shaped recording track.
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) | 1979-08-03 | 1980-02-02 | 1980-08-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-08-03 | 1984-02-02 | 1984-08-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-08-03 | 1988-02-02 | 1988-08-03 | $7700.00 | Window Closed / Lapsed |