Patent EP0110365A2 successfully refreshed from Google Patents.
EP0110365A2
Expired / Lapsed
EP
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Video tape recorder
Assignee: Olympus Corp
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Filing: 1983-11-28
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Granted: —
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Expires: 2003-11-28
Abstract
Abstract A helical scanning type video tape recorder having a rotary cylinder (2) which is slidable on a video tape (3); and a pair of vertical magnetization recording heads (11, 12) mounted on the peripheral wall of the rotary cylinder (2) at prescribed positions; that plane of the vertical magnetization recording heads (11, 12) which faces the magnetic plane of the video tape (3) being provided with a main magnetic pole (33) and auxiliary magnetic pole (31), thereby causing at least one portion (34a) of the recording magnetic flux (Φ) passing from the auxiliary magnetic pole (31) to the main magnetic pole (33) to penetrate the recording magnetic layer (3c) of the video tape (3) at substantially right angles.
Inventors
- 👤 Yutaka Yunoki
- 👤 Kenji Kimura
- 👤 Akira Kato
- 👤 Tasuo Imamura
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-02 14:40
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/48; G11B5/52; G11B5/53; G11B5/531; G11B5/008; G11B5/00813; G11B5/00847; G11B5/0086; G11B5/02; G11B5/127; G11B5/1278; G11B5/534; G11B5/538; H; H04; H04N; H04N5/00; H04N5/76; H04N5/78; H04N5/782; H04N5/7824; H04N5/7826; H04N5/78263
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
117 words
A rotary head type video tape recorder which comprises: a rotary cylinder (2) in slidable contact with a video tape (3); and at least one vertical magnetization recording head (11, 12) being mounted on said rotary cylinder (2) at a prescribed location thereof, wherein that portion of said vertical magnetization recording head (11, 12) which faces the magnetic plane of said video tape (3) is provided with a main magnetic pole (33) and auxiliary magnetic pole (31), so that at least part (34a) of the recording magnetic flux ( 9 ) passing between said main magnetic pole (33) and said auxiliary magnetic pole (31), substantially perpendicularly, penetrates a recording magnetic layer (3b) of the video tape (3).
Claim 2
Dependent Claim
117 words
A rotary head type video tape recorder which comprises: a rotary cylinder (2) in slidable contact with a video tape (3); and at least one vertical magnetization recording head (11, 12) being mounted on said rotary cylinder (2) at a prescribed location thereof, wherein that portion of said vertical magnetization recording head (11, 12) which faces the magnetic plane of said video tape (3) is provided with a main magnetic pole (33) and auxiliary magnetic pole (31), so that at least part (34a) of the recording magnetic flux ( 9 ) passing between said main magnetic pole (33) and said auxiliary magnetic pole (31), substantially perpendicularly, penetrates a recording magnetic layer (3b) of the video tape (3).
Claim 3
Dependent Claim
159 words
A video tape recorder according to claim 1, characterized in that said video tape (3) comprises: a base film (3a); a first magnetic layer (3b) formed on said base film (3a), said first magnetic layer (3b) having an axis of easy magnetization in a direction along which said recording magnetic flux (φ) flows parallel to the plane of said base film (3a); a second magnetic layer (3c) formed on said first magnetic layer (3b), said second magnetic layer (3c) having an axis of easy magnetization in a direction along which said recording magnetic flux ( $ ) flows perpendicular to the plane of said base film (3a). 3. A video tape recorder according to claim 1, characterized in that the peripheral wall of the rotary cylinder (2) is provided with at least one playback head (21, 22) in a position located at a prescribed distance from the position at which said vertical magnetization recording head (11, 12) is mounted.
Claim 4
Dependent Claim
64 words
A video tape recorder according to claim 3, characterized in that the playback head (21, 22) has a transducing gap formed in a position facing the magnetic plane of the video tape, and a ring-shaped magnetic circuit which is intersected by said transducing gap; and wherein magnetism-electricity conversion means (31a, 310a) of said playback head (21, 22) is connected to said ring-shaped magnetic circuit.
Claim 5
Dependent Claim
66 words
A video tape recorder according to claim 4, characterized in that said playback head (21, 22) is provided with said magnetism-electricity conversion means (31a, 310a); said vertical magnetization recording head (11, 12) is applied in recording the shorter wavelength component of a signal to be recorded; and said playback head (21, 22) is used to record the longer wavelength component of said signal to be recorded.
Claim 6
Dependent Claim
78 words
A video tape recorder according to claim 3, characterized in that said rotary cylinder (2) is provided with two vertical magnetization recording heads (11, 12) spaced apart from each other at a circumferential angle of about 180°; and with two playback heads (21, 22) which are spaced apart from each other at a circumferential angle of about 180°, being respectively set apart from the corresponding vertical magnetization recording heads (11, 12) at a circumferential angle of about 90°.
Claim 7
Dependent Claim
60 words
A video tape recorder according to claim 6, characterized in that said vertical magnetization recording heads (11, 12) are exclusively used for vertical magnetization recording; said playback heads (21, 22) are applied to the playback of a video signal from the video tape (3) on which recording is effacted, by the vertical magnetization recording system or planar magnetization recording system.
Claim 8
Dependent Claim
88 words
A video tape recorder according to claim 3, characterize in that the vertical magnetization recording head (11, 12) helically scans the magnetic plane of the video tape (3) wound around the rotary cylinder (2); and the rotational locus (Xl) of the vertical magnetization recording head (11, 12) is set apart from the rotational locus (X2) of the playback head (21, 22), at a distance (LX) corresponding to the distance (2(G + H)) between the respective recording tracks formed on the video tape (3) by said helical scanning process.
Claim 9
Dependent Claim
69 words
A video tape recorder according to any one of claims 3 to 8, characterized in that the rotary cylinder (2) is provided with recording rotary transformers (13, 14) respectively connected to said vertical magnetization recording heads (11, 12), and with playback rotary transformers (23, 24) respectively connected to said playback heads (21, 22); the recording rotary transformers (13, 14) being electromagnetically shielded from the playback rotary transformers (23, 24).
Claim 10
Dependent Claim
95 words
A video tape recorder which is characterized in that a plurality of vertical recording magnetic heads (11, 12) and a plurality of playback magnetic heads (21, 22) having a ring-shaped magnetic circuit are jointly mounted on the peripheral wall of the rotary cylinder (2); and in that a video signal is recorded on a magnetic tape (3) which is provided with a perpendicular magnetization layer and is helically wound around the peripheral wall of said rotary cylinder (2), a video signal being reproduced from said magnetic tape (3) by said playback magnetic heads (11, 12).
Claim 11
Dependent Claim
95 words
A video tape recorder which is characterized in that a plurality of vertical recording magnetic heads (11, 12) and a plurality of playback magnetic heads (21, 22) having a ring-shaped magnetic circuit are jointly mounted on the peripheral wall of the rotary cylinder (2); and in that a video signal is recorded on a magnetic tape (3) which is provided with a perpendicular magnetization layer and is helically wound around the peripheral wall of said rotary cylinder (2), a video signal being reproduced from said magnetic tape (3) by said playback magnetic heads (11, 12).
Claim 12
Dependent Claim
157 words
ll. A rotary head type video tape recorder comprising: a rotary cylinder (2) which is slidable on a video tape (3); at least one main vertical magnetization recording magnetic pole (110 or 120) provided at a given position of the peripheral wall of said rotary cylinder (2), and a magnetic wall (100) partly wound around the peripheral wall of said rotary cylinder (2), wherein said video tape (3) travels in a state in which it is interposed between the peripheral wall of said rotary cylinder (2) and the magnetic wall (100); said main magnetic poles (110, 120) mounted on said rotary cylinder (2) are respectively provided with means (112, 122) for generating a magnetic flux corresponding to a signal to be recorded on said video tape (3); and a magnetic flux generated from said main magnetic pole (110, 120) perpendicularly penetrates the magnetic layer of said video tape (3), to be absorbed by said magnetic wall (100).
Claim 13
Dependent Claim
157 words
ll. A rotary head type video tape recorder comprising: a rotary cylinder (2) which is slidable on a video tape (3); at least one main vertical magnetization recording magnetic pole (110 or 120) provided at a given position of the peripheral wall of said rotary cylinder (2), and a magnetic wall (100) partly wound around the peripheral wall of said rotary cylinder (2), wherein said video tape (3) travels in a state in which it is interposed between the peripheral wall of said rotary cylinder (2) and the magnetic wall (100); said main magnetic poles (110, 120) mounted on said rotary cylinder (2) are respectively provided with means (112, 122) for generating a magnetic flux corresponding to a signal to be recorded on said video tape (3); and a magnetic flux generated from said main magnetic pole (110, 120) perpendicularly penetrates the magnetic layer of said video tape (3), to be absorbed by said magnetic wall (100).
Claim 14
Dependent Claim
50 words
A video tape recorder according to claim 3, characterized in that said vertical magnetization recording head (11, 12) is provided for use in recording and playback of a vertical recording system, and said playback head (21, 22) is provided for use in recording and playback of a planar recording system.
References Cited (Backward Citations)
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