JPS60175241A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To apply a vertical magnetic head to a magnetic recording/reproducing device using a rotary head and to realize recording for a long period of time, by forming a guide drum into a conical shape and hooking a magnetic tape over the fixed and rotary drums in a chevron form. CONSTITUTION:The upper rotary drum 2 of a guide drum 1 has a 60 deg. angle formed by the bottom surface and a bus bar. The lower rotary drum 2 of the drum 1 also has a 60 deg. angle in the same way as the drum 2. Four vertical magnetic heads 4 are attached to the drum 2 with a 90 deg. space respectively. When these four heads 4a-4d are set, a main magnetic pole 6 is buried into the lower end of the drum 2. While an auxiliary magnetic pole 7 is set at the outside of the drum 2 and in opposition to the pole 6. A magnetic tape 10 has a contact with the drum 3 and is guided by a tape guide 12 set to the drum 3 through its lower edge to be driven toward an arrow head. Then the tape 10 is pressed to the drum 2 and then to the drum 3 again. Thus the tape 10 is driven.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a magnetic recording and reproducing device, and more particularly to a magnetic recording and reproducing device in which a conical guide drum is provided with a magnetic head for perpendicular recording and reproducing.

BACKGROUND TECHNOLOGY Conventionally, video recorders for household use that record and reproduce video signals have been designed with practical tape speed and tape 111 in mind, and a standard mode in which one frame is recorded on two tracks using a rotating two-head structure. For example, it is designed to record for about 2 hours, and in order to achieve longer recording times, the recording density on the magnetic tape must be increased.Furthermore, with conventional recording densities, To record one track (one field), approximately the entire width of the magnetic tape is required except for the longitudinal track along the side edges of the magnetic tape, making it impossible to perform back-and-forth recording as in audio recording. There was a drawback.

In addition, in conventional magnetic recording systems using conventional magnetic tape and ring-shaped heads, the magnetic material of the magnetic tape has a self-demagnetizing effect, making it impossible to increase the recording density in the in-plane direction of the magnetic tape beyond a certain level. There were drawbacks.

-On the other hand, a perpendicular magnetic recording amphibious system has recently been proposed in which the magnetic material of the magnetic Arp is magnetized in the perpendicular direction.

This perpendicular magnetic recording method allows high-density anti-recording. The perpendicular magnetic head used for this purpose has a main magnetic pole and an auxiliary magnetic pole facing each other and spaced apart from each other at both ends thereof, and performs recording and reproduction by running a magnetic arc between the two magnetic poles.

However, in conventional video tape recorders, even if a vertical magnetic head is installed on a cylindrical guide drum on which the magnetic tape is spirally run over 180 degrees or more and used as a rotating head, the magnetic arp The perpendicular magnetic head could not be mounted on a cylindrical guide drum as a rotary head for recording and reproducing because it could not run between the two magnetic poles of the head.

Therefore, the present invention eliminates the above drawbacks by installing magnetic heads for perpendicular recording and reproducing at 90' intervals on the rotating drum of the conical guide drum, and running the magnetic tape by hanging it on the rotating drum and the fixed drum in a chevron shape. An object of the present invention is to provide a magnetic recording/reproducing device that solves the above problems.

Means for Solving the Problems The present invention provides a guide drum consisting of a conical rotating drum and a fixed drum, and guide drums arranged at 90° intervals (=J) on the rotating drum.
&) Recording and reproducing are performed while sequentially rotating by 90 degrees 4
It consists of two perpendicular recording and reproducing magnetic heads, and the magnetic tape is attached to a rotating drum from a fixed drum, and is then run by hanging it in a chevron shape so that it is attached to the fixed drum. An example of this will be described.

Example FIGS. 1A to 1C show a second embodiment of the apparatus of the present invention.

In the figure, reference numeral 1 denotes a guide drum consisting of a rotating upper drum 2 and a fixed lower drum 3 having a conical shape.

The rotating upper drum 2 is coaxially provided close to and spaced apart from the fixed lower drum 3, and is rotated at high speed by a motor (not shown). Further, the rotating upper drum 2 and the fixed lower drum 3 are shaped so that the conical surfaces of the rotating upper drum 2 and the fixed lower drum 3 continue as they are when they are close to each other and separated from each other. Regarding the shape and dimensions of each drum, for example, the upper rotating drum 2 has an upper diameter of 20.8 mm.

The lower diameter is 50.8111 flll, the length of the m line is 30
mm, the angle between the bottom surface and the generatrix is 60', and the upper part diameter of the rotating lower drum is 50.8 tlltll, the upper diameter is 04.46 mm, and the length of the Gl line is 18.651 mm.
11111, the angle formed by the base line and the generating line is selected to be 60°.

zla-/l (+ is a magnetic head for perpendicular recording/reproduction (hereinafter referred to as perpendicular magnetic head), each having the same shape, one of which is shown enlarged as perpendicular magnetic head 4 in FIG. 2. The head 4 has a substantially U-shaped magnetic core 5 made of a soft magnetic material, with opposite ends spaced apart from each other to form a main magnetic pole 6 and an auxiliary magnetic pole 7.
A coil 8 is wound around the auxiliary magnetic pole 7, and both ends of the coil 8 are taken out through terminals 9.

Four perpendicular magnetic heads 4 are mounted on the rotating upper drum 2 at 90' intervals, and when installing each of the vertical magnetic heads 48 to 4d, the main magnetic pole 6 is mounted on the rotating upper drum as shown in FIG. 2, and an auxiliary magnet 117 is disposed outside the rotating upper drum 2 to face it.

The magnetic tape 10 is moved in the direction of the arrow in the figure while being guided by a tape guiding guide 12 shown in FIG. It travels, is attached to the rotating upper drum 2, and further moves as shown in Fig. 1 (
As shown in B), it travels while being attached to the fixed lower drum 3 again. At this time, the traveling magnetic arp 10 is relatively inserted into the space 11 between the two magnetic poles 6 and 7 of the rotating perpendicular magnetic head 4 from its upper edge, and the two magnetic poles 6 and 7
The magnetic arc 10 then exits the space 11 again from its upper edge. Therefore, when the magnetic tape 10 is viewed from the front, it runs in a chevron shape as shown in FIG. 1(C). Note that the magnetic tape 10 is
For example, Fe-
This is a magnetic tape for perpendicular magnetic recording and reproduction having a double layer structure of Ni/Go-〇r.

Further, the recording and reproduction of the video signal onto the magnetic tape 10 is performed approximately 90 minutes after the perpendicular magnetic head 4b reaches the position of the perpendicular magnetic head 4c.
One track of recording pattern is formed by rotation of .degree.

Therefore, the scanning locus of the perpendicular magnetic head 4 on the magnetic tape 101 becomes an arcuate locus shown by the dotted line and the solid line in FIG. 4, and an 11--rack is recorded and formed between the solid lines in the figure. Note that since high-density recording is performed on each track using the perpendicular magnetic head 4, one screen (two fields) can be recorded on one track. For example, the length of one track is about 39,
It is 88mm.

In the above embodiment, C was formed to form a recording pattern of 11 to 100 degrees around approximately the back surface of the magnetic arp 10 in the width direction, but the recording pattern is not limited to this, for example, 11 of the magnetic arp 10
With the mounting state the same as in the above embodiment, the position of the space 11 between the magnetic pole 6 and the auxiliary magnetic pole 7 is aligned with the magnetic tape 10 along the bus line.
), or each perpendicular magnetic head 4 may be left at the predetermined position of the above embodiment, and the magnetic tape 10 may be placed at a position shifted approximately 1/2 of its width. 2
Hang it in a position shifted downward by the dimension, and magnetic arp 1
By making the shape of the chevron 0 gentle and selecting the inclination of the conical guide drum so as to form an 11-rack during approximately 90° rotation of each perpendicular magnetic head 4, the signals of each frame are transferred to the magnetic tape 10. If one rack is formed and recorded within 1Z2 of the width of the magnetic tape, and then the left and right sides of the magnetic tape are turned over and recorded in the same manner as U, the magnetic tape 10 is recorded as shown in FIG. It is possible to reciprocate and record video signals on the upper part 10a and lower part 10b by reversing the direction of Arp travel.

Alternatively, as shown in FIG. 6, the auxiliary magnetic pole 7 may be embedded in the rotating upper drum 2, the main magnetic pole 6 may be disposed outside the rotating upper drum facing each other, and the magnetic arp 10 may be run with its magnetic surface facing outward. Recording and reproduction of video signals is performed using the perpendicular magnetic head 4. shown in FIG. b 'IJ
Recording and reproduction may be performed by rotating approximately 90'' until the vertical magnetic head 4a reaches the position of the vertical magnetic head 4b.Furthermore, an inverted conical guide drum structure with a fixed drum at the top and a rotating drum at the bottom may be used. The magnetic tape 10 may be mounted on a fixed upper drum and a rotating lower drum in a downwardly convex chevron shape Ii) and run.

Effects As described above, according to the device of the present invention, the guide drum can be shaped like a cone, and the magnetic tape can be shaped like a chevron on the fixed drum and the rotating drum! By hanging the magnetic tape, the magnetic tape can be smoothly inserted and removed from the side edge of the space between the main pole and the auxiliary magnetic pole of each approximately U-shaped vertical magnetic head, thereby making the vertical magnetic head a rotating head. It can be used in magnetic recording and reproducing devices based on this method, allowing high-density recording and shortening the track length, allowing long-term recording without compromising image quality.
In addition, the amount of magnetic tape used can be greatly reduced, and since one track can be recorded within approximately 1/2 the width of the magnetic tape, it also has the advantage of being capable of reciprocating recording and reproducing.

[Brief explanation of drawings]

1 is a left-right side view and a front view showing a magnetic recording/reproducing apparatus according to the present invention and a magnetic tape hanging state; FIG. 2 is an enlarged perspective view of a perpendicular magnetic head; FIG. Fig. 6 is a plan view showing each embodiment of the mounting state of the perpendicular magnetic head of the magnetic recording/reproducing apparatus according to the present invention, and Fig. 4 is a scanning view on a magnetic tape of the perpendicular magnetic head of the magnetic recording/reproducing apparatus according to the present invention. FIG. 1 shows the locus, and FIG. 5 shows other embodiments of the 1-to-Rack pattern formed on the magnetic tape. 1...Guide drum, 2...Rotating upper drum, 3...
・Fixed lower drum, 4, 4a to 4d...Vertical magnetic head, 5...Magnetic core, 6...Main magnetic pole, 7...Auxiliary magnetic pole, 10° 10a, 10b-...Magnetic tape, 11 .1
1a. 11c...Space part, 12...Tape guide. Figure 2 Broom Figure 3

Claims (1)

[Claims] 1. A guide drum consisting of a rotating drum and a fixed drum in the shape of Ill tl, which are attached to the rotating drum at 90' intervals and perform recording and reproduction while sequentially rotating by 90'.
The magnetic tape is attached to the rotating drum from the fixed drum, and is further attached to the fixed drum in a chevron shape for running. A magnetic recording and reproducing device. 2. The perpendicular recording/reproducing magnetic head has a main magnetic pole and an auxiliary magnetic pole and is approximately U-shaped, and the magnetic tape is inserted into the space between the two magnetic poles of the magnetic head from the side edge thereof. 2. A magnetic recording/reproducing device according to claim 1, characterized in that the magnetic recording/reproducing device is made of a J-uniform which is made to run with an inserted film.