US3911490A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Head drum structure for video tape recorder
Assignee: Individual
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Filing: 1973-12-10
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Granted: 1975-10-07
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Expires: 1993-12-10
Abstract
Abstract A video-tape recorder having a drum with a circular slot wherein at least one video magnetic head is adapted to rotate, said video-head interacting with a tape information carrier movable by means of a capstan from a supply reel to a take-up, reel around said drum and along guides arranged on said drum. In accordance with the present invention there is provided a rotor mounted on the same shaft with the video-magnetic head, said rotor separating the inner space of the drum immediately adjacent the tape information carrier into at least one overpressure space and at least one underpressure space wherein said video-magnetic head is disposed, while the cylindrical wall of the drum in the zone of contact with the tape information carrier is provided with a plurality of perforations through which perforations pressurized air from said overpressure and underpressure spaces of the drum act upon the video information carrier as the rotor rotates to blow away said carrier or to aspirate it to the surface of the drum, thus forming a running loop.
Inventors
- 👤 Boris Mikhailovich Kostin
- 👤 Boris Grigorievich Lapin
- 👤 Vladimir Alexandrovich Saburov
- 👤 Vladimir Iosifovich Sheikhetov
- 👤 Sergei Ivanovich Suvorov
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-10 02:25
CPC Classifications
G; G11; G11B; G11B27/00; G11B27/005; G11B15/00; G11B15/18; G11B15/1808; G11B15/38; G11B15/385; G11B15/60; G11B15/61; G11B5/00; G11B5/48; G11B5/52
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
319 words
An oblique line-recording video tape recorder comprising a supply reel to supply a tape video-information carrier, a take-up reel to store said tape, a stationary cylindrical drum positioned intermediate said supply and take-up reels, helical guide projections being provided on the surface of said drum defining therebetween a helical path for said tape about the circumference of said drum, a circumferential slot in said drum within the said defined path, a plurality of perforations formed in said drum within said defined path, a rotatable shaft coaxially mounted within said drum, at least one video magnetic-head carried by said shaft for rotation therewith within said circumferential slot and projecting beyond the exterior circumferential surface of the drum, a rotor carried by said shaft for rotation thErewith, said rotor being rotatable within said drum and dividing the interior thereof at least over the peripheral area of the drum coextensive with said defined path into at least one overpressure zone and at least one underpressure zone, said video magnetic-head being maintained within said underpressure zone, means for supplying pressurized gas to said overpressure zone and means for reducing the pressure within said underpressure zone, an air bearing support for said tape being thus formed over the circumferential extent of said overpressure zone and a predetermined suction pressure adapted to aspirate said tape into contact with the underlying surface of the drum in underpressure zone means for rotating said rotatable shaft, and means for withdrawing said tape from said supply reel for recording of the information thereon by said video magnetic-head and for winding upon said take-up reel at a predetermined rate, whereby rotation of said shaft and rotor effectuates the development of said air bearing which rotates together with the underlying overpressure zone while said video magnetic-head comes into contact with only the section of the tape aspirated against the surface of the drum by the suction pressure within said underpressure zone.
Claim 2
Dependent Claim
319 words
An oblique line-recording video tape recorder comprising a supply reel to supply a tape video-information carrier, a take-up reel to store said tape, a stationary cylindrical drum positioned intermediate said supply and take-up reels, helical guide projections being provided on the surface of said drum defining therebetween a helical path for said tape about the circumference of said drum, a circumferential slot in said drum within the said defined path, a plurality of perforations formed in said drum within said defined path, a rotatable shaft coaxially mounted within said drum, at least one video magnetic-head carried by said shaft for rotation therewith within said circumferential slot and projecting beyond the exterior circumferential surface of the drum, a rotor carried by said shaft for rotation thErewith, said rotor being rotatable within said drum and dividing the interior thereof at least over the peripheral area of the drum coextensive with said defined path into at least one overpressure zone and at least one underpressure zone, said video magnetic-head being maintained within said underpressure zone, means for supplying pressurized gas to said overpressure zone and means for reducing the pressure within said underpressure zone, an air bearing support for said tape being thus formed over the circumferential extent of said overpressure zone and a predetermined suction pressure adapted to aspirate said tape into contact with the underlying surface of the drum in underpressure zone means for rotating said rotatable shaft, and means for withdrawing said tape from said supply reel for recording of the information thereon by said video magnetic-head and for winding upon said take-up reel at a predetermined rate, whereby rotation of said shaft and rotor effectuates the development of said air bearing which rotates together with the underlying overpressure zone while said video magnetic-head comes into contact with only the section of the tape aspirated against the surface of the drum by the suction pressure within said underpressure zone.
Claim 3
Dependent Claim
27 words
A video tape recorder according to claim 1, wherein said helical guide projections have a depth at least as great as the depth of said air bearing.
Claim 4
Dependent Claim
76 words
A video tape recorder according to claim 2, wherein said rotor comprises an upper disc and a lower disc mounted coaxially on said shaft, the periphereal portions of said discs being in close proximity to the inner surface of said drum so as to define a minimal clearance therebetween to thus minimize the loss of gas, at least one partition connected between said discs to thereby define said over pressure zone and provide said underpressure zone.
Claim 5
Dependent Claim
22 words
A video tape recorder according to claim 1, wherein the sections of said drum above and below said circumferential slot are gas-tight.
Claim 6
Dependent Claim
83 words
A video tape recorder according to claim 4, wherein said rotor is made in the form of a stepped partition disposed substantially horizontally and separating the inner space of said drum into two zones, one of said zones being said overpressure zone and the other of said zones being said underpressure zone, the height and position of the stepped portion of said partition corresponding to the height and position of that portion of said defined path which is coextensive with said overpressure zone.
References Cited (Backward Citations)
US3139489A
Cited
US3378646A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-10-06 | 1979-04-07 | 1979-10-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-06 | 1983-04-07 | 1983-10-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-06 | 1987-04-07 | 1987-10-07 | $7700.00 | Window Closed / Lapsed |