公开(公告)号：EP0110365A3

公开(公告)日：1985-06-19

申请号：EP83111898

申请日：1983-11-28

Applicant: OLYMPUS OPTICAL CO., LTD.

Inventor： Yunoki, Yutaka ,  Kimura, Kenji ,  Kato, Akira ,  Imamura, Tasuo

IPC: G11B05/008 ,  G11B05/52 ,  G11B05/78 ,  G11B05/12 ,  G11B05/02

CPC classification number: G11B5/531 ,  G11B5/0086 ,  G11B5/02 ,  G11B5/1278 ,  G11B5/534 ,  G11B5/538 ,  H04N5/78263

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.

Abstract translation: 一种具有可在录像带（3）上滑动的旋转圆柱体（2）的螺旋扫描型录像机; 和一对在预定位置安装在旋转圆筒（2）周壁上的垂直磁化记录头（11,12） 垂直磁化记录头（11,12）的面对录像带（3）的磁性平面的那个平面设置有主磁极（33）和辅助磁极（31），从而导致至少一部分 从辅助磁极（31）通到主磁极（33）的记录磁通量（Φ）的大小（图34a）基本上以直角穿过录像带（3）的记录磁性层（3c）。

公开(公告)号：EP0111312A3

公开(公告)日：1985-01-23

申请号：EP83112352

申请日：1983-12-08

Applicant: HITACHI, LTD.

Inventor： Terada, Toshimichi ,  Kojima, Noboru ,  Shibata, Akira

IPC: G11B05/02 ,  H04N05/783 ,  G11B05/52

CPC classification number: H04N9/8255 ,  H04N5/78263 ,  H04N9/8205 ,  H04N9/8216 ,  H04N9/825

Abstract: 5 A helical scan type magnetic recording/reproducing apparatus in which a magnetic tape (1) is guided helically around a rotary magnetic head assembly (5) over an angular range approximately to 360°. Two magnetic heads (6, 7) are disposed relatively closely to each other at an angle smaller than 180°. The rotary magnetic head assembly (5) performs a single complete rotation for a unit period, for example, one-field period. In recording, video signal of the unit period undergoes time axis compression to be compressed to a period corresponding to a scanning period of the heads during which the magnetic heads (6,7) are in contact with the magnetic tape (1) in each rotation of the head assembly (5) and supplied to the magnetic heads which are so designed that the azimuth angles of the respective gaps differ from each other. The time-axis-compressed video signal is supplied to the two magnetic heads alternately in each of successive rotations of the head assembly (5). Alternatively, the video signal is separated into a luminance signal and a chrominance signal, wherein the former is supplied to one (6') of the magnetic heads while the latter is simultaneously supplied to the other (7'). The record tracks (65, 66, 67, 68) are formed on the magnetic tape in a pattern identical with the track pattern formed by a conventional two-head helical scan type video recorder in which the magnetic heads are disposed in opposition to each other with an angular distance of 180° therebetween and in which no time axis conversion is performed. Thus, the magnetic tape recorded according to the proposal can be reproduced by using the conventional magnetic recording/reproducing apparatus of two-head helical scan type.

公开(公告)号：EP0074796A3

公开(公告)日：1984-01-18

申请号：EP82304724

申请日：1982-09-08

Applicant: SONY CORPORATION

Inventor： Ohira, Takao ,  Niiro, Makoto ,  Okihara, Daijiro

IPC: G11B05/52 ,  G11B15/12 ,  G11B05/02

CPC classification number: G11B15/14

Abstract: A video tape recorder includes a rotary magnetic head drum having a rotating member and a magnetic head (9) mounted on the rotating member, a laser element (LD) mounted on the rotating member, a current source (10) for supplying a constant current to the laser element (LD), a circuit for electrically connecting a coil (8) of the magnetic head (9) in parallel with the laser element (LD), a photoelectric conversion member (PD) fixed in the video tape recorder, and members (12, 15) for optically coupling the laser element (LD) with the photoelectric conversion member (PD).