EP0110680A2
Expired / Lapsed
EP
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Magnetic recording and reproducing apparatus
Assignee: Panasonic Holdings Corp
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Filing: 1983-11-24
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Granted: —
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Expires: 2003-11-24
Abstract
Abstract A magnetic recording/reproducing apparatus comprises a ' rotor drum (11) mounting thereon a plurality of rotary magnetic heads (1a, 1b, 1c, 1d), a plurality of reproducing amplifiers (5a-5d), recording/reproducing mode switching circuits (4a-4d), head selection circuits (6, 7), control circuits (21, 22) and a DC voltage source (23). The control signal circuit (21, 22) and the DC voltage source (23) receive a control signal transmitted from a stator drum through a rotary transformer (17, 18b) and produce signals for controlling the mode switching circuits (4a-4d) and the head selecting circuits (6, 7) and a DC voltage for energizing all the circuits on the rotor drum, respectively.
Inventors
- 👤 Atsuo Ochi
- 👤 Akio Hashima
- 👤 Masao Tomita
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-07 11:25
CPC Classifications
G; G11; G11B; G11B15/00; G11B15/02; G11B15/12; G11B15/14
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
182 words
A magnetic recording/reproducing apparatus having a cylinder unit comprising a rotor drum, a stator drum and coupling means for transmitting signals between the rotor and stator drums, wherein said rotor drum comprising: a plurality of rotary magnetic heads for recording and reproducing video signals; amplifying means for amplifying signals reproduced by said plurality of rotary magnetic heads; recording/reproducing mode switching means for coupling said plurality of rotary magnetic heads with said amplifying means and said amplifying means with said coupling means during reproducing mode, and coupling said coupling means with said plurality of rotary magnetic heads and isolating said amplifying means from said plurality of rotary magnetic heads during recording mode; head selecting means for selecting one rotary magnetic head among said plurality of rotary magnetic heads; control means producing control signals for controlling said mode switching means and said head selecting means a control signal transmitted from said stator drum through said coupling means; and a power source producing a DC voltage for energizing all of said means from said control signal transmitted from said stator drum through said coupling means.
Claim 2
Dependent Claim
182 words
A magnetic recording/reproducing apparatus having a cylinder unit comprising a rotor drum, a stator drum and coupling means for transmitting signals between the rotor and stator drums, wherein said rotor drum comprising: a plurality of rotary magnetic heads for recording and reproducing video signals; amplifying means for amplifying signals reproduced by said plurality of rotary magnetic heads; recording/reproducing mode switching means for coupling said plurality of rotary magnetic heads with said amplifying means and said amplifying means with said coupling means during reproducing mode, and coupling said coupling means with said plurality of rotary magnetic heads and isolating said amplifying means from said plurality of rotary magnetic heads during recording mode; head selecting means for selecting one rotary magnetic head among said plurality of rotary magnetic heads; control means producing control signals for controlling said mode switching means and said head selecting means a control signal transmitted from said stator drum through said coupling means; and a power source producing a DC voltage for energizing all of said means from said control signal transmitted from said stator drum through said coupling means.
Claim 3
Dependent Claim
35 words
The apparatus according to claim 1, wherein said coupling means is a rotary transformer having a first channel for transmitting video signals and a second channel for transmitting said control signal from said stator drum.
Claim 4
Dependent Claim
31 words
The apparatus according to claim 2, wherein said control signal from said stator drum is an alternating signal having the frequency at the lower transmittable frequency band of said rotary transformer.
Claim 5
Dependent Claim
25 words
The apparatus according to claim 3, wherein said power source is located inside a rotary disk of the rotor drum so as to be shielded.
Claim 6
Dependent Claim
35 words
The apparatus according to claim 3, further comprising erase bias oscillating means for supplying an erase signal to an erase head and an audio head, and said erase signal is used as said alternating signal.
Claim 7
Dependent Claim
45 words
The apparatus according to claim 3, further comprising: an oscillator generating a carrier signal; modulating means for modulating said carrier signal by a recording/reproducing mode switching signal and a head selection signal, a modulated signal from said modulating means being used as said alternating signal.
Claim 8
Dependent Claim
39 words
The apparatus according to claim 6, further comprising switching means for switching said head selection signal according to said recording/reproducing mode switching signal so that said head selection signal is not applied to said modulating means during recording mode.
References Cited (Backward Citations)
No citation records indexed.
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