US4630132A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Video signal recording/reproducing apparatus
Assignee: Hitachi Ltd
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Filing: 1983-12-07
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Granted: 1986-12-16
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Expires: 2003-12-07
Abstract
Abstract A helical scan type magnetic recording/reproducing apparatus in which a magnetic tape is guided helically around a rotary magnetic head assembly over an angular range approximating to 360°. Two magnetic heads are disposed relatively closely to each other at an angle smaller than 180°. The rotary magnetic heads assembly performs a single complete rotation for a unit period, for example, one field period. In recording, video signal of the unit period undergoes time axis compression to be compressed to a period corresponding to a scanning period of the heads during which the magnetic heads are in contact with the magnetic tape in each rotation of the head assembly and supplied to alternately the magnetic heads which are so designed that the azimuth angles of the respective gaps differ from each other. Alternatively, the video signal is separated into a luminance signal and a chrominance signal, wherein the former is supplied to one of the magnetic heads while the latter is simultaneously supplied to the other.
Inventors
- 👤 Toshimichi Terada
- 👤 Noboru Kojima
- 👤 Akira Shibata
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 17:10
CPC Classifications
H; H04; H04N; H04N9/00; H04N9/79; H04N9/80; H04N9/82; H04N9/825; H04N9/8255; H04N5/00; H04N5/76; H04N5/78; H04N5/782; H04N5/7824; H04N5/7826; H04N5/78263; H04N9/8205; H04N9/8211; H04N9/8216
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
193 words
A video signal recording/reproducing apparatus of helical-scan type, in which a video signal is recorded on a magnetic tape in successive tracks which are inclined to the longitudinal direction of the tape, comprising: a rotary cylinder around which said magnetic tape travels by more than 180 degrees of rotation angle of the cylinder along a helical path and means for rotating said cylinder in synchronism with the field period of said video signal; a pair of magnetic heads disposed on said rotary cylinder so as to trace said recording tracks on said magnetic tape as said cylinder rotates, said heads having gaps whose azimuth angles which are different from each other, said magnetic heads being disposed at an interval of other than 180 degrees of the rotation angle of the rotary cylinder; first means for converting the video signal during a head rotation period into a video signal having a time period corresponding to the period during which said magnetic tape is scanned by said magnetic heads for each rotation of said rotary cylinder; and second means for applying the converted video signal to said magnetic heads for recording on said magnetic tape.
Claim 2
Dependent Claim
193 words
A video signal recording/reproducing apparatus of helical-scan type, in which a video signal is recorded on a magnetic tape in successive tracks which are inclined to the longitudinal direction of the tape, comprising: a rotary cylinder around which said magnetic tape travels by more than 180 degrees of rotation angle of the cylinder along a helical path and means for rotating said cylinder in synchronism with the field period of said video signal; a pair of magnetic heads disposed on said rotary cylinder so as to trace said recording tracks on said magnetic tape as said cylinder rotates, said heads having gaps whose azimuth angles which are different from each other, said magnetic heads being disposed at an interval of other than 180 degrees of the rotation angle of the rotary cylinder; first means for converting the video signal during a head rotation period into a video signal having a time period corresponding to the period during which said magnetic tape is scanned by said magnetic heads for each rotation of said rotary cylinder; and second means for applying the converted video signal to said magnetic heads for recording on said magnetic tape.
Claim 3
Dependent Claim
39 words
A video signal recording/reproducing apparatus according to claim 1, wherein said second means includes third means for supplying said converted video signal provided by said first means to said pair of magnetic heads alternately for every cylinder rotation period.
Claim 4
Dependent Claim
76 words
A video signal recording/reproducing apparatus according to claim 1, wherein said first means further includes separating means for separating the luminance signal component and chrominance signal component of said video signal from each other and for supplying substantially simultaneously said luminance signal component and said chrominance signal component to respective ones of said pair of magnetic heads so as to form substantially simultaneously two different record tracks for said luminance signal and said chrominance signal, respectively.
Claim 5
Dependent Claim
19 words
A video signal recording/reproducing apparatus according to claim 1, wherein said first means is constituted by time-axis compressing means.
Claim 6
Dependent Claim
19 words
A video signal recording/reproducing apparatus according to claim 2, wherein said first means is constituted by time-axis compressing means.
Claim 7
Dependent Claim
19 words
A video signal recording/reproducing apparatus according to claim 3, wherein said first means is constituted by time-axis compressing means.
Claim 8
Dependent Claim
40 words
A video signal recording/reproducing apparatus according to claim 1, wherein said first means is constituted by a video camera apparatus which outputs video signal having a frame period within the period during which said magnetic heads scan said magnetic tape.
Claim 9
Dependent Claim
40 words
A video signal recording/reproducing apparatus according to claim 2, wherein said first means is constituted by a video camera apparatus which outputs video signal having a frame period within the period during which said magnetic heads scan said magnetic tape.
Claim 10
Dependent Claim
40 words
A video signal recording/reproducing apparatus according to claim 3, wherein said first means is constituted by a video camera apparatus which outputs video signal having a frame period within the period during which said magnetic heads scan said magnetic tape.
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) | 1989-12-15 | 1990-06-16 | 1990-12-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-12-15 | 1994-06-16 | 1994-12-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-12-15 | 1998-06-16 | 1998-12-16 | $7700.00 | Window Closed / Lapsed |