JPS58161105A - Rotary magnetic head device - Google Patents

Abstract

PURPOSE:To load a 4-channel rotary transformer without enlarging the outside circumferential shape, by placing two 2-channel rotary transformers on the upper and lower parts of a fixed cylinder for supporting a rotary cylinder and also guiding the running of a tape. CONSTITUTION:A fitting means of magnetic heads 2a, 2b to a rotary cylinder 3 is made to adhere to base materials 6a, 6b and is fixed by screws 7a, 7b. A fixed cylinder 21 is provided with ball bearings 11a, 11b for supporting a hollow shaft 28 fitted in the upper and lower directions, a guide stage 21a for guiding a tape 1, a stator 22a provided opposingly on the upper end face by providing a small gap on a rotor 30 of a rotary transformer provided on the lower end face of the rotary cylinder 3, and a stator 22b of the rotary transformer stuck to the lower end face. The stators 22a, 22b of said rotary transformers have a signal transmission line of 2 channels, respectively.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rotary rotary head device for recording and reproducing video signals on a magnetic tape.

FIG. 1 shows a cross-sectional view of a conventional rotating magnetic head device.
is a tape, which is wound diagonally around the rotating magnetic head device as shown in the figure and runs in the direction indicated by the arrow. Magnetic heads 2a and 2b are designed to scan the tape 1 obliquely with a width of 20 μm, respectively, as shown in FIG. 2C is a magnetic head scanning locus. As for the size of this rotating magnetic head device, a small one having a diameter of about 4011 mm and a height of about 40 mm is known. The structure consists of a rotating cylinder 6 that fixes and rotates the magnetic heads 2a + 2b, a fixed cylinder 4 that guides the tape 1 and supports 50 rotations of the rotating cylinder, and a motor that generates rotational force. 5.

More specifically, the rotary cylinder 3 connects the two magnetic heads 2m and 2b with the screws 7a through the paste materials 6a and 6b.
, 7bK. And the rotating cylinder 5
is fixed to the shaft 8 with a disk 9 interposed therebetween so that they rotate together, and a rotor 10a of a rotary transformer is attached to the disk 9. The fixed cylinder 4 has ball bearings 11a and 11b that support the shaft 8.
and a stator 10b of a rotating transformer are attached. The rotor 10a and stator 10b of this rotary transformer have two channels to suit each magnetic head. The motor 5 also includes a rotating magnet 12 and a fixed coil 13. It is arranged to face the yoke 14.

Video signal recording on the tape 1 in this rotary magnetic head device is transmitted from the signal processing circuit to the stator 10b of the rotary transformer through a small gap to the rotor 10b of the rotary transformer.
After being transmitted to 0a, it is transmitted to magnetic heads 2a and 2b. Further, the reproduced signal of the tape 1 is transmitted backward through the transmission path.

By the way, when increasing the recording time on a tape using this rotating magnetic head device, in order to narrow the video signal recording width of diagonal scanning, that is, to double the recording time, the conventional scanning width of 20 μm is required. This becomes possible if the width is made 10 μm.

Generally, the wider the recording width, the better the S/N ratio of the image, resulting in a more beautiful image. That is, double time recording is suitable for long-time recording although the image quality is inferior, and conventional recording is suitable when image quality is a priority. In this way, when two types of recording methods are performed in the same rotary magnetic head device, magnetic heads suitable for each are used, and four magnetic heads are required. Therefore,
The rotary transformer also needs to be a four-channel rotary transformer so as to correspond to each magnetic head.

FIG. 5 is a sectional view of the four-channel rotary transformer 15. This 4-channel rotary transformer 15 has a fixed rotary transformer 15a and a rotary rotary transformer ISB facing each other, each having four recesses 16a.

16b, 16c, 16d, 17a, 17b,
17c and 17d are provided, and coils 19a and 1 are provided in each recess.
9b, 19c, 19d, 20B, 20b.

It has a structure in which 20c and 20d are arranged. This 4
The channel rotation transformer 15 is arranged at a distance al+a2. to prevent signal leakage (crosstalk) between channels. It is not possible to narrow a3. Therefore, the outer diameter]) is larger than that of a conventional two-channel rotary transformer. usually,
For 2 channel rotary transformer, 1) = 30~35y+
However, in the 4-way tunnel rotary transformer 15,
D: It will be about 401 rich.

By the way, since the outer diameter of a conventional small rotary magnetic head device equipped with a two-channel rotary transformer is approximately 40 mm, it is not possible to mount a four-channel transformer. It was impossible.

The present invention was made in view of the above-mentioned circumstances, and an object of the present invention is to provide a rotary magnetic head device having a smaller outer circumferential shape than the conventional one and capable of mounting a four-channel rotary transformer.

The rotary magnetic head device of the present invention includes a rotary cylinder arranged on the upper part, on which a plurality of rotary magnetic heads are mounted, and a rotor of a rotary transformer fixed at the lower end surface position, and a rotary cylinder that guides a tape and has a plurality of rotary magnetic heads mounted thereon. A fixed cylinder supported by a hollow shaft and a bearing, has a stator facing the rotor with a small gap on its upper end surface, and has a stator of a rotating transformer fixed on its lower end surface, and is arranged in a case. a rotor having a built-in magnet arranged opposite to the coil and yoke, fixed to the end face of the shield case fixed to the lower end of the hollow shaft, and arranged opposite to the stator on the lower end face of the fixed cylinder; A video signal transmission line is provided that is connected to the rotor fixed to the shield case and drawn out upward inside the hollow shaft.

Hereinafter, one embodiment of the rotating magnetic head device of the present invention will be explained with reference to FIG. 4. FIG. 4 shows a cross-sectional view of the rotating magnetic head device, in which the rotating cylinder 3 has four magnetic heads arranged at 90 degree intervals on the outer circumference. are arranged, and of the two magnetic heads 2, only 2b is shown.

The means for attaching the magnetic heads 2a, 2b to the rotary cylinder 3 are as in the conventional case, glued to base materials 6a, 6b and screws 7a.
, 7b. 21 is a fixed cylinder, and the fixed cylinder 21 is a ball bearing 11a that supports a hollow shaft 28 attached in the vertical direction.

11b, a guide stage 21a that guides the tape 1, and a stator 22a that is opposed to the upper end surface of the rotary cylinder 3 with a small gap between the rotor 60 of the rotary transformer and the rotor 60 of the rotary transformer arranged on the lower end surface of the rotary cylinder 3.
and a rotary transformer stator 22b fixed to the lower end surface. A stator 22a of this rotating transformer,
22b each has a two-channel signal transmission path.

The rotating cylinder 6 is connected to the hollow shaft 2 via a disk 29.
8, and a rotor 50 is fixed to a disk 29 at an end surface position of the rotary cylinder 6. hollow shaft 2
A magnet 26 is fixed to the lower end of B with a shield case 52 interposed therebetween, and the magnet 23 is attached to the fixed cylinder 21.
Screw 27a at the lower end.

The yoke 25 and the coil 24, which are adhesively fixed in the case 26 fixed via the yoke 27b, are disposed opposite to each other to form a motor. A rotor 33 is fixed to the shield case 62 and faces the stator 22b fixed to the lower end surface of the fixed cylinder 21 with a small gap therebetween.

Signal transmission between the rotor 50 of the rotary transformer and the magnetic head 2a is performed by an Eirin signal transmission line 61, and signal transmission between the rotor 66 of the lower rotary transformer and the magnetic head 2b is connected to the rotor 33. This is carried out through a video signal transmission line 34 that is guided all the way up inside the hollow shaft 28 and connected to the magnetic head 2b.

In this way, the rotating magnetic head of this embodiment has two two-channel rotating transformers arranged above and below a fixed cylinder that supports the rotating cylinder and guides the running of the tape.
It has a total of 4 channels of signal transmission paths, and therefore, it is possible to mount a rotary transformer with 4 channels I even if the outer periphery is as small as the conventional one.

As described above, the rotating magnetic head device fit of the present invention is
The outer circumferential shape is as small as the conventional one, and it has the advantage of being able to mount a four-channel rotary transformer.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view of a conventional rotary magnetic head device, FIG. 2 is an explanatory diagram of a tape scanning locus of the device in FIG. 1, FIG. 3 is a sectional view of a 4-channel rotary transformer, and FIG. 1 is a cross-sectional view of an embodiment of a rotating magnetic head device. 1...Tape 2a, 2b...Magnetic head 3...Rotating cylinder 11a, 11b...Ball bearing 21...Fixed cylinder 22a, 22b...
・Stator 23... Macnet 24... Coil 2
5...Yoke 26...Case 28...Hollow shirt) [0, 33...Rotor 64...Video signal transmission line also 1 Figure base 1 z Rabbit 2 Country

Claims (1)

[Claims] 1. A rotary cylinder arranged on the upper part, on which a plurality of rotating magnetic heads are mounted, and a rotor of a rotary transformer fixed on the lower end surface, and a rotary cylinder that guides the tape and that is connected to the rotary cylinder through a hollow shaft and a bearing. A fixed cylinder is supported, and has a stator that faces the rotor with a small gap on its upper end surface, and a stator of a rotating transformer is fixed on its lower end surface, and a coil and a yoke arranged in a case are arranged opposite to each other. a rotor which has a built-in gobnet fixed to the end face of the shield case fixed to the lower end of the hollow shaft and is disposed opposite to the stator on the lower end face of the fixed cylinder; and a rotor fixed to the shield case. A rotating magnetic head device characterized in that it is provided with a video signal transmission line that is connected to the hollow shaft and drawn out upwardly within the hollow shaft.