US4356520A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic record/reproduction apparatus of a stationary head type
Assignee: Olympus Corp
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Filing: 1980-07-10
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Granted: 1982-10-26
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Expires: 2000-07-10
Abstract
Abstract Multichannel magnetic heads are connected to record and reproduction signal lines through electronic switching elements. The electronic switching elements are successively switched by the switching control signals to be successively connected to said magnetic heads.
Inventors
- 👤 Tuneo Yanagida
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 10:44
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/48; G11B5/49; G11B5/4969; G11B15/00; G11B15/02; G11B15/12
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
188 words
A magnetic record/reproduction apparatus of the stationary head type comprising: multichannel magnetic heads; signal lines for carrying record signals and reproduction signals; an electronic switching circuit coupled between said magnetic heads and said signal lines; and switching control means which selectively supplies switching control signals to said electronic switching circuit for selectively connecting said magnetic heads to said signal lines, said switching control means including: a calculator for calculating an allowable recording or reproduction time as a function of a track length and a traveling speed of the magnetic tape; a timer for counting the recording or reproduction time and for generating a count value output signal; a comparator coupled to said timer and to said calculator for comparing the count value of the output of said timer with said allowable time calculated by said calculator and, when said count value and said allowable time coincide with each other, said comparator producing an output signal; and a shift register responsive to said output signal from said comparator for supplying said switching control signals to said electronic switching circuit for selectively connecting said magnetic heads to said signal lines.
Claim 2
Dependent Claim
188 words
A magnetic record/reproduction apparatus of the stationary head type comprising: multichannel magnetic heads; signal lines for carrying record signals and reproduction signals; an electronic switching circuit coupled between said magnetic heads and said signal lines; and switching control means which selectively supplies switching control signals to said electronic switching circuit for selectively connecting said magnetic heads to said signal lines, said switching control means including: a calculator for calculating an allowable recording or reproduction time as a function of a track length and a traveling speed of the magnetic tape; a timer for counting the recording or reproduction time and for generating a count value output signal; a comparator coupled to said timer and to said calculator for comparing the count value of the output of said timer with said allowable time calculated by said calculator and, when said count value and said allowable time coincide with each other, said comparator producing an output signal; and a shift register responsive to said output signal from said comparator for supplying said switching control signals to said electronic switching circuit for selectively connecting said magnetic heads to said signal lines.
Claim 3
Dependent Claim
44 words
The magnetic record/reproduction apparatus of claim 1, wherein: said electronic switching circuit comprises a plurality of electronic switching elements connected to said multichannel magnetic heads, respectively; and said switching control means successively supplies said switching control signals to respective ones of said switching elements.
Claim 4
Dependent Claim
46 words
The magnetic record/reproduction apparatus of claim 1 or 2, wherein said signal lines correspond respectively to said magnetic heads, and said switching control circuit controls said switching circuit so as to connect said magnetic heads to said signal lines successively in turn, one after the other.
Claim 5
Dependent Claim
21 words
The magnetic record/reproduction apparatus of claim 1 or 2, wherein said multichannel magnetic heads each are of the single turn type.
Claim 6
Dependent Claim
34 words
The magnetic record/reproduction apparatus of claim 1 or 2, wherein said signal lines correspond respectively to said magnetic heads, and said electronic switching circuit selectively connects said respective signal lines to said magnetic heads.
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) | 1985-10-25 | 1986-04-26 | 1986-10-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-10-25 | 1990-04-26 | 1990-10-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-10-25 | 1994-04-26 | 1994-10-26 | $7700.00 | Window Closed / Lapsed |