US4236185A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for distortion-free still picture reproduction with magnetic video tape
Assignee: Grundig EMV Elektromechanische Versuchsanstalt Max Grundig GmbH
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Filing: 1978-09-27
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Granted: 1980-11-25
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Expires: 1998-09-27
Abstract
Abstract A method for distortion-free still picture reproduction from magnetic video tape slant tracks wherein the tracks are recorded and scanned without any guard band therebetween by means of two video heads which rotate in a common plane with different azimuth angles. During still picture recording, two adjacent slant tracks are continuously or repetitively scanned by two rotating video hands which have different azimuth angles with one head displaced axially by one slant track width with respect to the other. During still mode reproduction, the two adjacent slant tracks are continuously scanned by mechanically deflecting the two rotating video heads by way of plungers following a ring.
Inventors
- 👤 Michael Obremski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:39
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/76; H04N5/78; H04N5/782; H04N5/783; G; G11; G11B; G11B5/00; G11B5/48; G11B5/52; G11B5/53
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
170 words
A device for the recording, reproduction, and distortion-free reproduction of slant tracks recorded on magnetic video tape without any intermediate spacing between adjacent tracks, said device comprising: a drum; two video heads mounted in said drum and adapted to rotate in a common plane with different azimuth angles; a pair of spring leaves, each of said heads being mounted to one of said springs; a pair of plungers, each plunger having one end engaging one of said springs and an opposite end; and an axially adjustable ring mounted in said drum, said ring having an upper surface which rises linearly for half the width of a slant track about half its circumference and declines linearly over the remaining half of its circumference, said ring being adjustable between a first position out of contact with said plungers and a second position wherein said plungers' opposite ends engage said ring upper surface; and one of said plungers is shorter than the other of said plungers by the width of a slant track.
Claim 2
Independent Claim
170 words
A device for the recording, reproduction, and distortion-free reproduction of slant tracks recorded on magnetic video tape without any intermediate spacing between adjacent tracks, said device comprising: a drum; two video heads mounted in said drum and adapted to rotate in a common plane with different azimuth angles; a pair of spring leaves, each of said heads being mounted to one of said springs; a pair of plungers, each plunger having one end engaging one of said springs and an opposite end; and an axially adjustable ring mounted in said drum, said ring having an upper surface which rises linearly for half the width of a slant track about half its circumference and declines linearly over the remaining half of its circumference, said ring being adjustable between a first position out of contact with said plungers and a second position wherein said plungers' opposite ends engage said ring upper surface; and one of said plungers is shorter than the other of said plungers by the width of a slant 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) | 1983-11-25 | 1984-05-26 | 1984-11-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-11-25 | 1988-05-26 | 1988-11-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-11-25 | 1992-05-26 | 1992-11-25 | $7700.00 | Window Closed / Lapsed |