JPS6074172A - Disk-shaped recording device - Google Patents

Abstract

PURPOSE:To decrease a blank part on a disk, which has to be provided due to a read error of address information, by forming a small part whose reflection factor (or transmissivity) is made different from its circumferential part, on the inside circumferential position (or the outside circumferential position) of an address recording area. CONSTITUTION:A data recording area 12 and an address recording area 15 are provided on a recording disk 11, a thin plate 13 is installed to a part being near the inside circumference of the recording area 12, and printing is performed to a small part 14 of the thin plate 13 so that a reflection factor of a light is different from other part. As for the small part 14 and the address recording area 15, the arrangement angles correspond to each other. The disk 11 is installed to a rotary device 17, and a light projected from a projecting source 18 provided so as to be opposed to the thin plate 13 is reflected by the thin plate 13 and detected by a photodetector 19. in this case, an optical signal detected by the photodetector 19 through the small part 14 in which a reflection factor of a light is different is detected as one pulsative signal at every one rotation of the disk 11. A signal which is applied some constant delay time to the signal from the photodetector 19 can be used as an exact and correct timing pulse for starting the recording and reproducing.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Scope The present invention relates to improvements in the structure of disk-shaped recording devices such as optical disks and magnetic disks.

<Prior Art> In recent years, various storage devices for H-1 calculators and recording devices for image information and audio information have been devised and put into practical use. Broadly speaking, the recording medium material is coated and vaporized onto the surface of a long thin tape made of organic film, etc.
A tape-shaped recording device constructed using the above method, and a disk-shaped recording device constructed by coating or vapor-depositing a material to become a recording medium on the surface of a disc made of organic film, plastic, glass, metal, etc. We can separate. As the recording medium, magnetic oxide 1 is used.
Examples include sensitive organic substances and metals. The above-mentioned disk-shaped recording device has been particularly developed and put into practical use in recent years due to its advantages such as its versatility, low cost, and high-speed accessibility.

However, in this disk-shaped recording device, when recording and reproducing information, the Jc recording circle & is usually rotated around the central axis, and the outer circumference (or inner circumference) is shifted from the inner circumference (or outer circumference) of the disk. ) to move the record/playback end to the spiral recording trunk to perform recording/playback. Alternatively, another method is to form concentric circles on a disk and perform recording/reproduction according to ranks. In any case, what is important for these recording tracks is that it is necessary to know the information (address information@) about where each track is located on the disk. In other words, when recording, it is necessary to find a track at the address to be recorded, and then access the recording device to that track and perform recording.When performing playback, it is necessary to search for the track at the address to be recorded. After locating a trunk, it is necessary to access the playback f value for that trunk and perform playback.

The position of the recording track on the disk is configured in a spiral or concentric manner as described above, and therefore is uniquely determined by the distance from the center of the disk. Therefore, if the distance from the center of rotation of the disk is detected by some method, it is possible to use information about that distance as address information. However, such a method has the following disadvantages. That is, during rotation, the rotating shaft of the disk does not remain stationary, but some vibration occurs due to the bearing or other mechanical precision limitations. Therefore, the disk also vibrates in the radial direction, and when the channel width is larger than the track width, the recording/playback device crosses multiple tracks, so in this case, the recording/playback device's circle Merely setting the distance 1η[f from the center of the board does not provide enough width to obtain accurate address information 5tli. This is usually l・
A method is used in which address information is recorded in advance in a part of the U-tsuk and the address 1'' information is obtained by reading out the information as needed.

This address information will be recorded/recorded based on this information.
It can also be used to determine the point at which playback begins.

An example of a conventional method for detecting address information will be described with reference to FIG. A recording area 2 is set on a disk 5 having a center hole 1. 4 is an address area in which address information is recorded in advance, and 31 years old is its boundary line. The 21st screen C contains the address information recorded in the address area 4. The address information t1 recorder 8 usually contains a plurality of address data 8a, 8b, 8c,
8d and 8e are recorded. There are some blanks before and after the address information recording section 8 for recording/playback data! Data storage section 6.10rζt arranged with <1', 7°9; self-recorded. When recording/reproducing information (without reproducing the address data in the address information recording section 8, reading out the address 8a, and recording the predetermined data after a certain period of time based on the addon) Recorded in section 10 or data record 1η510
Play back the data recorded in -1-.

Here, if the address data 8a to 80 are completely reproduced, there is no problem; in such a system, sometimes the state of the disk - the state of the device's idle state (the more the address data 8a is reproduced). It is not done (1'! i force (there is).

When recording information in such a case, bcD, the willpower that becomes the standard for data recording changes, so a rank occurs, and the position of the last end of the data also changes, and in some cases, the next address is changed. [For blue Tμ, data may also be erroneously recorded in self-record 7'X6. In order to avoid this problem, please write the length of the data at address 10.
to create a blank in front of) ゛Rank + 3 (
47, and data 1 is set to the next address data even if it changes due to data recording position force or address reading error.
However, the blank space 7 is also necessary due to the following principle (i.e., the disk force 11-1) exists, and its rotational speed is not always completely constant. (
Even if you start recording from the data recording section 10 with the address 8a (based on the jitter), the last end of the data will still fluctuate due to thick data.Therefore, in order to absorb that fluctuation, Also]゛Rank t', +< 7 +
-h is required.

〈Problems that the invention attempts to resolve〉 - As mentioned above, the limit of electrical accuracy with the disk-shaped recording device that recorded the Atlus I Seiko 1st 6th, 4th year & t1th time. That address? Frank 1 ((I have to set up 4 minutes) before and after the 48th issue mentioned above. f(3;; I couldn't increase my self-recording density, so I couldn't increase my self-recording density.)

Confession> The present invention has been developed in view of this point. ) Komonotea-,te.

All of the ranks il≦(
The purpose is to reduce the disk area of 4 to 1.

<Example> Hereinafter, an example in which the present invention is applied to a recording system using a magneto-optical disk will be described with reference to the drawings.

FIG. 3 shows an embodiment of the present invention, in which a recording disk J1 is provided with a data recording area 12 and an address recording area 15. The disk 11 is made of rare earth materials such as gadolinium and terbium as a recording medium. Using an amorphous alloy thin film of elements and transition metals such as iron and cobalt, the above medium material is deposited on the disk Jl by a method such as evaporation or sputtering.
The so-called magneto-optical effect of these materials is used to reproduce signals.

Information is recorded and reproduced by irradiating a recording medium with a narrowly focused laser beam spot. That is, recording is performed by locally increasing the temperature of the medium using a laser beam, and reproduction is performed using the Kerr effect or Radhe effect between light and the medium. A thin plate 13 is attached to a further inner periphery of the recording area 12 of the disk 11 to which the substance having the magneto-optical effect is attached, and a small portion 1 of this thin plate 13 is attached.
4 is printed in such a way that the light repulsion rate is different from that of other parts (surrounding parts). , and as shown in the same figure, a small 7X1
(The minute 14 and the address recording area 15 correspond to the arrangement angle.

Next, an application example of a system using this disk 11 will be explained as shown in FIG. The disk 11 with the thin plate 13 attached thereto is attached to a rotating device 17, and the signal information recorded on the recording surface of the disk 11 is recorded using a racer).
It reads from 6 and reads dl. Further, a light projection source 18 and a light receiver 19 are arranged facing 71 to the thin plate 13, and the light projected from the projection source 11-1 4.1 is directed to the thin plate 13.
[The anti-moon is 1 and the anti-moon is 0] The anti-moon light can be detected by the light receiver 19.

Here, the thin plate 13 (C is a small part J4 with different anti-optical shielding of light)
Since the optical signal υ detected by the photoreceiver 19 is
For every revolution of 1, 1 ・ζRus-down Shin 5 is given as 5 IJ, 5. In addition, the thin plate work 3 is a circular plate 11 and ζ fixed 1.
Since it is installed, the recording/playback device is 1G or recording/playback 41:.

(1 Noah [0 on the data in Figure 2)
77, which corresponds to Ji minutes), is always a certain amount of time different from the time when the light receiver 19 detects the pulsed signal. Therefore, a signal obtained by adding a certain delay time to the pulsed signal from the light receiver 19 can be used as a timing pulse for starting recording and reproduction.

Here, the signal from the light receiver 19 is the small portion 14 on the thin plate 13.
If the contrast with respect to other parts is sufficiently large, detection can be made with sufficient certainty and without error. Therefore, the blank part 7 is used to absorb variations caused by reading errors, such as when reading address information in the recording/reproducing device 16.
There is no need to provide Therefore, the blank area 7, which could not be used for recording up to now, can be used for recording, contributing to an increase in recording capacity.

Incidentally, when there is jitter in the rotation device 17 of the disk 11, it is necessary to provide a blank section 7 to absorb it. Therefore, it is possible to set the number smaller than before.

Although the above is one embodiment of the present invention, various other application examples can be considered based on the gist of the present invention. For example, the small part 14 provided on the thin plate 13 attached to the center of the disk 11 is printed here, but it is not limited to special printing, and any material that gives contrast to the reflectance of light can be used. Alternatively, holes may be made in the thin plate, or other materials may be pasted.The shape of the cut small portion 14 is not limited to a rectangle, but may have other shapes, such as a circle or a long slot/shape. Also, the shape of the thin plate 13 is not limited to a disk shape, and it is of course possible to take other shapes. Instead of having the structure shown in FIGS. 5(a) and 5(b), only a small portion may be directly attached to the disk 11 as shown in FIGS. 5(c) and (d). 31'& 4 so that it is attached 1% inside the data G self-recording area 12.
'C is listed, but it is not limited to this.
It may be provided outside the recording area.

In the above example, 74117115 due to changes in the amount of reflected light.
However, as shown in Fig. 6, for example, even if a light receiver 19 and a light film ρ=1'i18 are placed with a disk 11 in between, pulse reliability can be obtained by changing the amount of transmitted light. Encroachment. In the above embodiment, the parts with different reflectances become the parts with different transmittances.

Next, a case will be described in which a method of forming portions with different transmittances or reflectances on a disk is applied to an optical disk. FIG. 7 shows a sectional view of the original disk. The information recording portion 21 of the t0 optical disk is usually obtained by forming a thin film on the substrate 2o by sputtering, vacuum deposition, or the like.

Therefore, when forming the information recording section 21, a mask of an appropriate shape is placed and a portion of the recording film is removed to provide a /J'y portion with a different transmittance or reflectance. The shape position etc. of the above mask are 1rj with different above-mentioned anti-noise 2j ratios.
It can be considered in the same way as when i minutes are provided.

Effects> As described above, according to the present invention, it is possible to reduce the unused portion on the disk that must be provided due to misreading of address information and is not used for recording, and the information is saved as a whole. It is possible to increase the number of recording sections lj'L.

[Brief explanation of drawings]

FIG. 1 is a plan view of a conventional disk-shaped recording device, FIG. 2 is a partial configuration explanatory diagram thereof, FIG. 3 is a plan view of an embodiment of the disk-shaped recording device according to the present invention, and FIG. 4 is its plan view. An explanatory diagram of the configuration of the recording endogenous system, FIG. 5 is an explanatory diagram of an example of marking,
FIG. 6 is a diagram illustrating the configuration of another example of the above system, and FIG. 7 is a diagram illustrating a partial configuration of an optical disc. In the figure, E: center hole, 2: recording area, 4 near address area, 5: disk, 6. JO: data recording section, 7, 9 blanks), 8 near address information recording section, 11: disk, 12 two recording areas, 13: thin plate, 14: small part, 15 near address recording areas, 16: recording. Reproducing device, 17: Rotation device, 18: Optical film 4.1 source, 19: Light receiver, 20: Substrate, 21: Information recording section, 22: Protective layer.

Claims (1)

[Claims] 1. Covering the surface of a disc-shaped substrate with a storage medium, and forming an address recording area within a predetermined central angle area of the storage medium 1
-1 A disk-shaped recording device characterized in that a small portion having a reflectance or transmittance different from that of the surrounding portion is formed at an inner circumferential position or an outer circumferential position of the address recording area.