JPS594773B2 - Transfer speed converter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides magnetic recording and magneto-optical reproduction.
The present invention relates to a transfer speed conversion device that reproduces and transfers information at a speed different from the recording speed of the information.

Generally, when displaying various types of information processed by a computer or other device or generated by some device as a still image on a television receiver, etc., the amount of information sent from these devices is equivalent to one screen. At the same time, the speed of the transmitted information is determined by the type of device.
In order to display such information in 5 predetermined formats,
It is necessary to repeatedly apply the signal to a receiver or the like at a predetermined constant speed.

That is, as an example, for an NTS auxiliary receiver, 1
It is necessary to repeatedly provide information for one screen with a period of /30 seconds, and for this purpose, a type of method is used in which information equivalent to one screen is accumulated and then repeatedly sent out at the above-mentioned period. converters are essential.

Conventionally, therefore, semiconductor memory, in which information can be easily written and read, is used to digitize and store the information, read out the stored contents at the required speed, and convert the stored contents into analog form to be sent to the television receiver. However, in this case, NTSC
For example, the required frequency band for information is 10.7 MH
2 to 8BIL code 0 To convert and store 2.8
It requires a storage capacity of 5 MBit, which has the drawback of requiring high-speed operation and a large capacity and extremely expensive memory. Also,
Using a magnetic disk recording and reproducing device that can change the rotation speed, set the rotation speed during playback to 18 oorpl or an integral multiple thereof, and change the rotation speed during recording to adjust the information transmission speed during playback. It is possible to record at the speed required by the machine, but it takes several seconds to several tens of seconds to change the rotation speed, so it is impossible to change the image relatively quickly at a rate of several frames per second. This brings about the disadvantages of

In order to eliminate these conventional drawbacks at once, the present invention uses magnetic recording and magneto-optical reproduction in combination, and furthermore, the rotating disk and the reproduction section are always rotated coaxially and at a constant speed, and reading and writing are performed simultaneously. This is what I did in 5.

Therefore, it is possible to change the image extremely effectively at a rate of several frames per second without requiring the switching time between reading and writing as in the conventional case. Hereinafter, details of the present invention will be explained with reference to figures showing examples.

FIG. 1 is a perspective view showing the configuration, in which a signal of information to be recorded is amplified by a recording amplifier 1 and then applied to a magnetic head 2, which rotates as a rotating body having the structure described below with its surface facing downward. The information is magnetically recorded on the surface of the disk 3.

On the other hand, a reproducing section 4 that performs magneto-optical reproduction is provided on the back side of the rotating disk 3, and rotates coaxially and relatively to the rotating disk 3 in the same direction as the rotating direction of the rotating disk 3 shown by the arrow. As will be described later, a reproduced information signal is obtained from the back surface of the rotating disk 3, and the signal is amplified by the regenerative amplifier 5 before being sent out.

Note that the rotating disk 3 and the reproducing section 4 each have a motor 6a.
and 6b, each of which rotates at a predetermined constant speed.

FIG. 2 is a cross-sectional view showing the details of the rotating disk 3 and the reproduction section 4. The rotating disk 3, which is shown with its surface facing downward as in FIG. 7, and a magneto-optic film 8 which exhibits a magneto-optical magnetic farade effect in the perpendicular direction, such as a GdFe magnetic garnet film, which is formed to a thickness of about 0.05 to several μm by a hesputtering method, a vapor deposition method, etc. Furthermore, NiCOl formed on the surface
It is composed of a magnetic film 9 having a high coercive force such as COp, and magnetic recording is performed on the magnetic film 9 by the magnetic head 2. The reproducing unit 4 also includes a light source 10 such as a light emitting diode, a polarizing plate 11, a half mirror 12, and a lens 1.
3. An analyzer plate 14 and a light receiver 15 such as a photo transistor are provided, and the light beam emitted from the light source 10 passes through a polarizing plate 11, is bent downward by a half mirror 12, and is vertically reflected by a lens 13. The light is projected, passes through the substrate 7 and the magneto-optical film 8, is vertically reflected on the back surface of the magnetic film 9, and enters the lens 13 again.

The light incident on the lens 13 passes through the half mirror 12 and enters the light receiver 15 via the analyzer plate 14, where it is converted into an electrical signal.

However, the relationship between the polarizing plate 11 and the analyzing plate 14 is determined by the extinction position (
By arranging the magneto-optic film 8 in the vicinity of a crossed nicol, a signal corresponding to the magneto-optical rotation of the polarization angle of the light beam generated when the light beam passes through the magneto-optic film 8 twice can be obtained from the light receiver 15. 8 itself has only a low resolution with respect to changes in the signal, but its magnetization action is determined by transferring the magnetization state according to the recording signal of the magnetic film 9. A reproduced signal determined by the resolution of the signal and corresponding to the recorded signal is obtained from the optical receiver 15.

Note that the rotational speeds of the rotating disk 3 and the reproduction section 4 may be determined as follows.

That is, for example, when used for displaying still images on a television receiver, etc., the amount of information required to configure one screen is A,
Assuming that the transfer sheet to which recorded information is given is B/sec and the display cycle of the receiver is C images/sec, when one screen is composed of one track of the rotating disk 3, the rotational speed R of the rotating disk 3 is
1/second is expressed by the following formula.

Further, the rotation speed R2/second of the reproducing section 4 may be determined by the following formula.

However, in R2 and O, the rotation is reversed. Therefore, with the above relationship, it is possible to send out a reproduction signal at a speed suitable for the receiver at the latest 1/C seconds after recording information for one screen. Note that when n tracks are continuously switched and used, RlR2 increases by n times,
The access time is 1/NC seconds later.

In addition, in the above explanation, a metal film such as NlCO was used for the magnetic film 9, but in practice, CrO, which is used for magnetic tape, etc.
2. The magnetic film 9 may be formed by coating magnetic fine particles such as CO-RFe2O3 and r-Fe2O3.

However, in this case, since the reflective ability of the magnetic film 9 for light is low, as shown in FIG. It is necessary to provide a reflective film 16. Figure 4 shows
FIG. 4 is a cross-sectional view showing another embodiment of the regeneration unit 4, in which the motor 6b
The rotary shaft 19 of the armature 18 supported by ball bearings 17a and 17b is hollow, and the arm 20 is bent at right angles, and a lens 13 is provided on the lower surface of the tip, and the optical path is formed by mirrors 21a and 21b. The light source 10 to the light receiver 15 are provided separately above the rotating shaft 19, and the electrical system of the light source 10, the light receiver 15, etc. and the rotation system are separated, and the configuration of the reproducing unit 4 is facilitated. It's summery.

According to the configuration shown in FIG. 4, only one track can be reproduced, but in order to use multiple tracks, each wavelength of the optical spectrum can be assigned to each track, and the wavelengths can be differentiated using a color filter or the like.

As is clear from the above description, the present invention uses both magnetic recording and magneto-optical reproduction, and furthermore, the rotating disk and the reproduction section are always rotated coaxially and at a constant speed, and reading and writing are performed simultaneously. It is something. In this way, the present invention enables extremely effective image changes at a rate of several frames per second without using high-speed operation and large-capacity memory, and without requiring the switching time between reading and writing as in the conventional technology. .

[Brief explanation of the drawing]

The figures show an embodiment of the present invention, in which Fig. 1 is a perspective view showing the configuration, Fig. 2 is a sectional view showing details of the rotating disk and the reproduction section,
FIG. 3 is a sectional view showing another embodiment of the rotating disk, and FIG. 4 is a sectional view showing another embodiment of the reproducing section. 2... Magnetic head, 3... Rotating disk (
rotating body), 4... reproducing section, 6a, 6b...
...Motor, 7...Substrate, 8...Magneto-optical film, 9...Magnetic film, 10...Light source, 11... Polarizing plate, 12...half mirror, 13...lens, 14...analyzing plate, 15...light receiver.

Claims (1)

[Claims] 1. A rotating body in which a magneto-optical film exhibiting a magneto-optical effect in the perpendicular direction is formed on a transparent substrate, and a magnetic film with high coercive force is formed on the surface of the rotating body, and a magnetic head that records information on the surface;
The information is reproduced in accordance with the magneto-optical rotation of the polarization angle of the light beam that constantly rotates coaxially at a constant speed different from that of the rotating body, projects a light beam perpendicularly to the back surface of the rotating body, and is reflected perpendicularly. 1. A transfer speed converting device comprising a reproducing section, and obtaining a speed difference between the speed at which the recording is performed and the speed at which the reproducing is performed.