US5349478A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic recording and/or reproducing method having a double azimuth head arrangement
Assignee: Sony Corp
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Filing: 1993-03-16
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Granted: 1994-09-20
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Expires: 2013-03-16
Abstract
Abstract A magnetic recording and reproducing method for enhancing picture quality and other characteristics while suppressing the difference in reproduction output between two heads. The method involves using a double azimuth head arrangement for signal recording and reproduction by helical scan. The two heads A and B are provided so that their azimuth angles theta A and theta B do not coincide with each other. The actual recording direction represented by the sum of the azimuth angles theta A and theta B on the one hand and a still angle alpha between the heads A and B on the other is made as close to the direction of magnetic particle orientation on the magnetic recording medium as possible.
Inventors
- 👤 Kenichi Sato
- 👤 Kazunobu Chiba
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 22:12
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/48; G11B5/52; G11B5/53; G11B5/531; G11B5/534; G11B5/56; G11B5/02
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
114 words
A magnetic recording and/or reproducing method for recording and/or reproducing signals on a magnetic medium by helical scan with a double azimuth head arrangement containing two heads, said magnetic medium having a coating of magnetic particles aligned in a longitudinal direction with respect to said magnetic medium, said heads scanning respective tracks inclined at an angle α relative to said longitudinal direction, one of said two heads having an azimuth angle of θ A and the other of said two heads having an azimuth angle of θ B , wherein |θ A |≠|θ B |, such that |β A |-|β B |≦10°, where β A =|α+|θ A || and β B =|α-|θ B ||.
Claim 2
Dependent Claim
114 words
A magnetic recording and/or reproducing method for recording and/or reproducing signals on a magnetic medium by helical scan with a double azimuth head arrangement containing two heads, said magnetic medium having a coating of magnetic particles aligned in a longitudinal direction with respect to said magnetic medium, said heads scanning respective tracks inclined at an angle α relative to said longitudinal direction, one of said two heads having an azimuth angle of θ A and the other of said two heads having an azimuth angle of θ B , wherein |θ A |≠|θ B |, such that |β A |-|β B |≦10°, where β A =|α+|θ A || and β B =|α-|θ B ||.
Claim 3
Dependent Claim
37 words
A magnetic recording and/or reproducing method according to claim 1, wherein said azimuth angles of said heads are formed such that said |θ A | and |θ B | have respectively different angles of at most 30°.
Claim 4
Dependent Claim
36 words
A magnetic recording and/or reproducing method according to claim 1, wherein said azimuth angles of said heads are formed such that α+|θ A | and α-|θ B | are respectively different angles of at most 30°.
Claim 5
Dependent Claim
23 words
A magnetic recording and/or reproducing method according to claim 1, wherein said magnetic particles are coated on said magnetic medium by oblique evaporation.
Claim 6
Dependent Claim
115 words
Apparatus for magnetically recording and/or reproducing signals on a magnetic tape comprising: a double azimuth head arrangement containing two heads for scanning oblique tracks across said tape, the magnetic tape having a coating of magnetic particles substantially aligned in a longitudinal direction of said tape and the oblique tracks being inclined at an angle a with respect to said longitudinal direction, one of said two heads being formed with an azimuth angle θ A and the other of said two heads being formed with an azimuth angle θ B , wherein |θ A |≠|θ B |, such that |β A |-|θ B |≦10°, where β A =|α+|θ A || and β B =|α-|θ B ||.
Claim 7
Dependent Claim
115 words
Apparatus for magnetically recording and/or reproducing signals on a magnetic tape comprising: a double azimuth head arrangement containing two heads for scanning oblique tracks across said tape, the magnetic tape having a coating of magnetic particles substantially aligned in a longitudinal direction of said tape and the oblique tracks being inclined at an angle a with respect to said longitudinal direction, one of said two heads being formed with an azimuth angle θ A and the other of said two heads being formed with an azimuth angle θ B , wherein |θ A |≠|θ B |, such that |β A |-|θ B |≦10°, where β A =|α+|θ A || and β B =|α-|θ B ||.
Claim 8
Dependent Claim
32 words
The apparatus of claim 5 wherein said azimuth angles of said heads are formed such that said |θ A | and |θ B | have respectively different angles of at most 30°.
Claim 9
Dependent Claim
31 words
The apparatus of claim 5 wherein said azimuth angles of said heads are formed such that α+|θ A | and α-|θ B | are respectively different angles of at most 30°.
References Cited (Backward Citations)
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