JPS60179980A - Information recording method - Google Patents

Abstract

PURPOSE:To facilitate easy control of the recorded information and at the same time to attain the effective use of a recording medium, by recording again the information on a recorded area to an unrecorded area and then recording successively the additional information to erase the information on the recorded area which is recorded again. CONSTITUTION:When the additional information A' is recorded to the information A, the information A recorded to a recorded area (a) is first recorded again to an unrecorded area (b). Then the information A' is recorded after the information A. In this case, the information A already recorded to the area (a) is erased. In case additional information C' and E' are recorded to the information C and E, the information C, C', E and E' are successively recorded after the information A'. Then information C and E recorded to the area (a) are erased. This facilitates the easy control and retrieval of recorded information. Furthermore the surface area of a photomagnetic disk 1 can be used effectively.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in an information recording method for recording information in addition to previously recorded information on a rewritable recording medium.

In general, when adding information that is related to previously recorded information, there are two methods: consider the conditions for additional recording in advance and record with enough space (recording area), and one method is to record without thinking about additional recording at all. , and a sequential recording method. In the former case, you need to leave enough space to take into account the conditions for additional records, but in the end, there is no wastage of space at all.
Additional records are rarely made (again.

This is due to the fact that there are many unrecorded parts during the process (until additional records are made).

This can be said to be an uneconomical method of using recording media. In the latter case,
Since 11th recording has been performed from the beginning, additional recording will be recorded in a different recording area.

Therefore, there is no relationship with previous recorded information, making it difficult to manage and search a series of recorded information.

An object of the present invention is to provide an information recording method that solves the above-mentioned problems, facilitates management and retrieval of recorded information, and allows effective use of recording media.

In order to achieve this object, one aspect of the present invention is to re-record information on a recorded area to an unrecorded area, record additional information following the information, and record information on the recorded area re-recorded to the unrecorded area. This feature is characterized in that the added information is deleted and the records of the added information are summarized in 5.

The present invention will be explained in detail below with reference to the drawings.

FIG. 1 is a perspective view showing an example of a magneto-optical disk device embodying the present invention. 1 is T on the surface of the base such as glass
A magneto-optical disk that carries a ferromagnetic thin film made of alloys such as b, Gd, and Fe.

The surface of the magneto-optical disk is divided into a recording area A and an unrecorded area opening, which are rotated in the direction of the arrow by a drive motor (not shown). 2 is an optical head which can be moved in the optical axis direction by a semiconductor laser 3, a collimator lens 4, a polarizer 5, a beam splitter 6 for separating incident light and reflected light, a total reflection mirror 7, a tracking mirror 8, and an actuator 9a. Objective lens 9. Condensing lens 10, cylindrical lens 11. It is composed of an analyzer 12 and a photoelectric conversion element 13. The optical head 2 is fixedly mounted on a base 14, and is sent in the radial direction of the magneto-optical disk 1 by a feed screw 15 connected to a drive motor (not shown).
Information is recorded or reproduced on the entire surface of the magneto-optical disk 1.

Now, suppose that information A, B, C, D, and E are recorded on the magneto-optical disk 1, and of these, information A.

Information to be added to C and E respectively, C' and E
'. First, information A, B, C,
D.

E is sequentially recorded on the recording area A of the magneto-optical disk 1 without considering additional information at all. The operation of the optical head 2 at this time will be described. A light beam modulated according to the information A-H is emitted from the semiconductor laser 3, and the light beam is turned into parallel light by the collimator lens 4, and the light beam is parallelized by the polarizer 5. The light passes through a beam splitter 6, a total reflection mirror 7, and a tracking mirror 8, and is focused by an objective lens 9 onto the recording area A of the magneto-optical disk 1 as a beam spot with a diameter of about 1 μm. Here, the magnetization direction of the ferromagnetic thin film on the magneto-optical disk 1 is aligned in one direction perpendicular to the female surface, and the magnetization direction of that portion is reversed by irradiation with the light beam emitted from the semiconductor laser 3. Then, as shown in FIG. 2, information A-E is recorded on the recording area A of the magneto-optical disk 1 as a reversal of magnetization.

Further, when reproducing the information A-E recorded in this manner, a light beam of a constant intensity is emitted from the semiconductor laser 3, and the light beam is passed through the collimator lens 4.
A polarizer 5, a beam splitter 6, a total reflection mirror 7, a tracking lens 2-8, and an objective lens 9 are provided, and the recording area A of the magneto-optical disk 1 is irradiated with light. Then, a part of the light beam is reflected on the surface of the magneto-optical disk 1, the plane of polarization is rotated, and the light beam is separated by the beam sinter 6 after passing through the objective lens 9. The light passes through and enters the photoelectric conversion element 13, where it is extracted as a reproduced signal. In other words, when the reflected light is reflected on one surface of the magneto-optical disk, the plane of polarization is rotated (due to the known magnetic Kerr effect) according to the direction of magnetization, and from this direction of polarization, the direction of magnetization of the ferromagnetic thin film is is determined and extracted from the photoelectric conversion element 13 as a reproduction signal.

Therefore, Mk adds additional information A', C' to the information A, C, E recorded on the recording area A of Tsukudajinosu 1.
, E' is shown in Figure 3+al~(d
This will be explained in order using l. When recording additional information to information A, first, the previously recorded information A is re-recorded in the unrecorded area opening, and then additional information A' is recorded (see Fig. 3(a)). )do. At this time, information A previously recorded in recording area A becomes unnecessary, so it is erased (third
Figure (see bl). Additional information C' to information C and H.

When recording E', the additional information A' recorded at the unrecorded area opening is followed by information C1 using the same method as described above.
Additional information C', information E, and additional information E' are recorded in this order, and information C and E recorded in recording area A are erased (see FIG. 3 (C1)).

Here, information A that was previously recorded in recording area A,
Since C and E are erased, those portions become unrecorded. In other words, there are randomly erased parts and parts where information remains. New information can be recorded in this unrecorded recording area A.

By the way, in the erased portion as described above, the location and the amount of information that can be recorded are random, so that problems often arise when recording new information depending on the amount of information to be recorded. Therefore.

In such a case, the amount of information still recorded in recording area A (information B) is smaller than the total amount of information (information A to E) previously recorded in recording area A.

The above-mentioned optical head 2 detects the proportion of D) remaining, and if it is determined that the proportion exceeds, for example, 40 to 50%, that information (here, information 13.
D) is rerecorded into the unrecorded area opening, and information B is recorded in the recording area A.

D may be deleted (see FIG. 3 (dl)).

Also, the amount of information is not detected.

When recording C' and E' as additional information to information A-H, information A, additional information N', and information B to the unrecorded area opening.
, C, additional information C', information E, and additional information E' may be re-recorded in this order to erase information A to E on recording area A all at once. In this way, the surface of the recording area is refreshed, and according to the new embodiment, 1. When dividing one surface of the magneto-optical disk into a recording area A and an unrecorded area opening, and recording additional information to the information previously recorded on the recording area A, the pre-recorded information is added to the unrecorded area. Since the information is re-recorded in the mouth and additional information related to it is subsequently recorded, it is possible to easily manage and search the recorded information.

Furthermore, since the information previously recorded on the recording area A is no longer needed, this information is erased, so that the surface of the magneto-optical disk can be used effectively.

In this embodiment, the magneto-optical disk 1 is used as the recording medium, but the present invention is not limited to this, and any erasable recording medium such as a magnetic disk or a magnetic drum may be used. Furthermore, although an optical system is used as a recording means, it is not limited to this.

As explained above, according to one aspect of the present invention, information on a recorded area is re-recorded in an unrecorded area, additional information is recorded following the information, and information on the recorded area re-recorded in the unrecorded area. Since the added information is deleted and the records of the added information are compiled, it is possible to easily manage and search the recorded information, and to make effective use of the recording medium.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of the configuration of an example of a magneto-optical disk device embodying the present invention, FIG. 2 is a plan view showing a recording area on the surface of the magneto-optical disk shown in FIG. 1, and FIG. ) is a plan view showing the method of recording additional TRV information step by step. 1... Magneto-optical disk, 2... Optical head, A to E
...information, A', C', E'...additional information,
B...1 recording area...unrecorded area. Patent applicant: Minoru Nakamura, representative of Canon Co., Ltd.

Claims (1)

[Claims] 1. An information recording method for recording additional information related to information previously recorded on the recording area on a rewritable recording medium surface divided into a recorded area and an unrecorded area,
The information on the recorded area is re-recorded in the unrecorded area, additional information is recorded following the information, and the information on the recorded area re-recorded in the unrecorded area is erased. information recording method.