US3863269A
Expired / Lapsed
US
⏱️ 0.0 years remaining
A guide drum apparatus for a video tape recorder and/or player
Assignee: Panasonic Holdings Corp
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Filing: 1973-07-27
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Granted: 1975-01-28
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Expires: 1993-07-27
Abstract
Abstract A guide drum apparatus for a magnetic tape comprises a first guide drum rotatable at a predetermined rotational speed and having a plurality of magnetic heads, and a second guide drum mounted coaxially with the first guide drum and rotatable independently therefrom. The first and second guide drum have tape guiding portions respectively which are opposed to each other to guide the magnetic tape therebetween. The tape is scanned by the magnetic heads with rotation of the first guide drum while the second guide drum rotates in conjunction with the tape movement.
Inventors
- 👤 Takenori Akamine
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 13:30
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/48; G11B5/52; G11B5/53
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
242 words
A guide drum apparatus for use in a video tape recorder and/or player in which a field or a frame of video signal is recorded in the longitudinal direction of a moving magnetic tape, and the recorded video signal is reproduced while the tape is moving, said apparatus comprising: a first guide drum having a tape guiding portion formed at the periphery thereof, and having a plurality of magnetic video heads mounted thereon; supporting means for rotatably supporting said first guide drum; driving means for rotating said first guide drum at a rotational speed greater than the speed of movement of the tape; a second guide drum mounted coaxially with said first guide drum and rotatable independently of said first guide drum, said second guide drum having a tape guiding portion which is formed at the periphery thereof and which is opposed to the tape guiding portion of said first guide drum so as to guide the magnetic tape therebetween; and the diameter of the tape guiding portion of said second guide drum being larger than the diameter of the tape guiding portion of said first guide drum, so that said second guide drum is rotated at a lower rotational speed than that of said first guide drum by contact with the moving tape, while said first guide drum rotates at said greater rotational speed, whereby while moving around said guide drums the magnetic tape is scanned by said magnetic video heads.
Claim 2
Dependent Claim
242 words
A guide drum apparatus for use in a video tape recorder and/or player in which a field or a frame of video signal is recorded in the longitudinal direction of a moving magnetic tape, and the recorded video signal is reproduced while the tape is moving, said apparatus comprising: a first guide drum having a tape guiding portion formed at the periphery thereof, and having a plurality of magnetic video heads mounted thereon; supporting means for rotatably supporting said first guide drum; driving means for rotating said first guide drum at a rotational speed greater than the speed of movement of the tape; a second guide drum mounted coaxially with said first guide drum and rotatable independently of said first guide drum, said second guide drum having a tape guiding portion which is formed at the periphery thereof and which is opposed to the tape guiding portion of said first guide drum so as to guide the magnetic tape therebetween; and the diameter of the tape guiding portion of said second guide drum being larger than the diameter of the tape guiding portion of said first guide drum, so that said second guide drum is rotated at a lower rotational speed than that of said first guide drum by contact with the moving tape, while said first guide drum rotates at said greater rotational speed, whereby while moving around said guide drums the magnetic tape is scanned by said magnetic video heads.
Claim 3
Dependent Claim
47 words
A guide drum apparatus as claimed in claim 1, wherein the frictional coefficient between said tape guiding portion of said second guide drum and the magnetic tape is larger than the frictional coefficient between said tape guiding portion of said first guide drum and the magnetic tape.
Claim 4
Dependent Claim
96 words
A guide drum apparatus as claimed in claim 1, wherein said apparatus further comprises tape wrapping means for wrapping the magnetic tape around said tape guiding portions of said first and second guide drums; brake means for engaging said second guide drum to brake the same while the magnetic tape is out of engagement with said second drum; and means for moving said brake means out of engagement with said second guide drum after the magnetic tape has been wrapped around said tape guiding portions of said first and second guide drums by said wrapping means.
References Cited (Backward Citations)
US2964594A
Cited
US3075049A
Cited
US3243798A
Cited
US3333753A
Cited
US3436491A
Cited
US3614338A
Cited
US3643038A
Cited
US3681539A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-01-27 | 1978-07-29 | 1979-01-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-27 | 1982-07-29 | 1983-01-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-27 | 1986-07-29 | 1987-01-28 | $7700.00 | Window Closed / Lapsed |