US4511934A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Video tape recorder
Assignee: Sony Corp
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Filing: 1982-09-09
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Granted: 1985-04-16
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Expires: 2002-09-09
Abstract
Abstract A video tape recorder includes a rotary magnetic head drum having a rotating member and a magnetic head mounted on the rotating member, a laser element mounted on the rotating member, a current source for supplying a constant current to the laser element, a circuit for electrically connecting a coil of the magnetic head in parallel with the laser element, a photoelectric conversion member fixed in the video tape recorder, and members for optically coupling the laser element with the photoelectric conversion member.
Inventors
- 👤 Takao Ohira
- 👤 Daijiro Okihara
- 👤 Makoto Niiro
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 07:57
CPC Classifications
G; G11; G11B; G11B15/00; G11B15/02; G11B15/12; G11B15/14
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
114 words
A video tape recorder comprising: a rotary magnetic head drum having rotating means and a magnetic head mounted on said rotating means, said magnetic head including a coil and being adapted to record or reproduce video signal information on a magnetic tape; a laser element mounted on said rotating means; means for supplying a constant current to said laser element; means for electrically connecting said coil to said laser element, whereby said laser element is adapted to produce an optical output including optical video signals; stationary photoelectric conversion means means mounted in said video tape recorder; and optical transmission means for transmitting optical video signals between said laser element and said photoelectric conversion means.
Claim 2
Dependent Claim
114 words
A video tape recorder comprising: a rotary magnetic head drum having rotating means and a magnetic head mounted on said rotating means, said magnetic head including a coil and being adapted to record or reproduce video signal information on a magnetic tape; a laser element mounted on said rotating means; means for supplying a constant current to said laser element; means for electrically connecting said coil to said laser element, whereby said laser element is adapted to produce an optical output including optical video signals; stationary photoelectric conversion means means mounted in said video tape recorder; and optical transmission means for transmitting optical video signals between said laser element and said photoelectric conversion means.
Claim 3
Dependent Claim
19 words
A video tape recorder according to claim 1, in which a capacitor is connected in series with said coil.
Claim 4
Dependent Claim
19 words
A video tape recorder according to claim 1, in which said transmission means comprises a lens and a mirror.
Claim 5
Dependent Claim
17 words
A video tape recorder according to claim 1, in which said transmission means comprises an optical fiber.
Claim 6
Dependent Claim
72 words
A video tape recorder according to claim 1, in which said recorder further comprises a recording amplifier for supplying a recording signal to said magnetic head; means for connecting an output of said laser element to said recording amplifier; and stationary light emitting means mounted in said video tape recorder for emitting a light corresponding to a recording signal; said transmission means optically coupling said light emitting means with said laser element.
Claim 7
Dependent Claim
72 words
A video tape recorder, comprising: rotary magnetic head means for recording or reproducing video signal information on a magnetic tape; rotary optical signal means mounted for rotary motion with said magnetic head means; stationary optical signal means; means for electrically coupling said magnetic head means to said rotary optical signal means; and optical transmission means for transmitting optical video signals between said rotary optical signal means and said stationary optical signal means.
Claim 8
Dependent Claim
72 words
A video tape recorder, comprising: rotary magnetic head means for recording or reproducing video signal information on a magnetic tape; rotary optical signal means mounted for rotary motion with said magnetic head means; stationary optical signal means; means for electrically coupling said magnetic head means to said rotary optical signal means; and optical transmission means for transmitting optical video signals between said rotary optical signal means and said stationary optical signal means.
Claim 9
Dependent Claim
18 words
A video tape recorder according to claim 6, in which said stationary optical means includes photoelectric conversion means.
Claim 10
Dependent Claim
19 words
A video tape recorder according to claim 6, in which said rotary optical signal means includes a laser diode.
Claim 11
Dependent Claim
19 words
A video tape recorder according to claim 6, in which said stationary optical signal means includes a photo diode.
Claim 12
Dependent Claim
17 words
A video tape recorder according to claim 6, wherein said transmission means includes at least one lens.
Claim 13
Dependent Claim
58 words
A video tape recorder according to claim 6, further comprising recording means for transmitting a signal to be recorded to said stationary optical signal means; reproducing means for receiving a reproduced signal from said stationary optical signal means; and selection means for alternatively coupling said stationary optical signal means to either said recording means or said reproducing means.
Claim 14
Dependent Claim
16 words
A video tape recorder according to claim 6, wherein said transmission means includes optical fiber means.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-04-15 | 1988-10-15 | 1989-04-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-04-15 | 1992-10-15 | 1993-04-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-04-15 | 1996-10-15 | 1997-04-16 | $7700.00 | Window Closed / Lapsed |