JPH01208732A - Recording system for optical recording medium - Google Patents

Abstract

PURPOSE:To certainly hold write recording information by recording the number of erased times in the label section or lead-in area of a disk-like optical recording medium in accordance with the number of erase or write times and, when the recorded number of erase times reaches a prescribed number, stopping writing operations thereafter. CONSTITUTION:A disk 1 has a diameter of 120mm and on the outside from the point at an inner diameter 50mm information is recorded. The number of rewrite times is printed in a label section on the inside of the point at the diameter 50mm. A bar-like mark 2 is printed in a rewrite recording section (namely, in the label section on the inner side of the disk) 2 by means of a printing head 3 and the mark 2 is recorded whenever the whole surface of the disk 1 from the inside to the outside is erased by means of laser light of a fixed light quantity. The reflecting light of the light projected on the bar-like section printed in black from a light emitting section 4 is read by a light receiving section (photoreceptor) 5 and recording and rewriting of the information is continued until the number of rewriting times reaches a re- writable limit. When the number of rewritten times reaches a prescribed number, the writing operation is automatically inhibited. Therefore, an optical recording medium, such as erasable and re-writable optical disk, etc., which is highly reliable in information holding property is obtained.

Description

[Detailed Description of the Invention] [Summary] This invention relates to a recording method for an optical recording medium that detects the state of deterioration of a rewritable optical recording medium and guarantees retention of recorded information, such as a rewritable optical disk. The purpose of rewriting is to detect the number of times an optical recording medium has been rewritten, the signal quality of rewriting, etc., to ensure that written recorded information can be retained, and to prevent recorded information from being erased by mistake. When recording information on a capable recording medium, the number of times of erasure or rewriting is recorded in the label part or lead-in area of the disc-shaped optical recording medium according to the number of times of erasure or writing, and the time when a predetermined number of times is reached, or when a write signal is recorded. The system detects the quality and prevents further writing when the signal quality has deteriorated below the limit value, and also prevents the information recorded on the optical recording medium from being erased by attaching and detaching the Rahel to the optical recording medium. Configure.

[Industrial application field]

The present invention relates to a recording method for an optical recording medium, and more particularly to a recording method for an optical recording medium that detects the state of deterioration of a rewritable optical recording medium to ensure retention of written recorded information.

[Conventional technology]

As for optical recording media, in addition to conventional read-only optical discs, high-level optical discs such as additional recording type (write-once type) that can be written only once and rewritable type have been developed. In particular, phase-change type rewritable optical discs change the crystalline state (crystalline state and amorphous state) of the recording film by irradiating it with a light beam (e.g. laser), and use the resulting change in reflectance to record information. It is attracting attention as an optical recording medium that can perform

However, rewritable optical recording media such as phase change type are not rewritable virtually infinite times like conventional magnetic disks, but for example approximately 2,000 times.
Although the number of times it can be rewritten is relatively large, the number of times that it can be rewritten is limited.

Therefore, in such a rewritable optical recording medium that can be rewritten a limited number of times, in order to inform the user of the deterioration status of the optical recording medium and to guarantee the retention of written record information, it is necessary to It is necessary to provide the rewritten optical recording medium with a prevention mechanism that prevents further rewriting. In addition, it is necessary to prevent recorded information from being mistakenly erased in a rewritable optical recording medium.

[Problem to be solved by the invention]

Therefore, it is an object of the present invention to provide a recording method for an optical recording medium, which detects the number of rewrites or the signal quality of rewriting of an optical recording medium such as a rewritable optical disk, and can reliably retain written recorded information. purpose.

Another object of the present invention is to provide a recording method for an optical recording medium that prevents information recorded on a rewritable optical recording medium from being erased by mistake.

[Means to solve the problem]

According to the first aspect of the present invention, when recording on a rewritable optical recording medium, a pattern corresponding to the number of times of erasure is recorded on a label portion of the inner peripheral part of the disc-shaped optical recording medium according to the number of times of erasure, A recording method for an optical recording medium is provided that prevents further writing once a predetermined number of times has been reached.

According to the second aspect of the present invention, when recording on a rewritable optical recording medium, the signal quality of rewriting is detected every time data is erased, and if the signal quality deteriorates below the limit value, no further writing is performed. A recording method for an optical recording medium is provided.

According to the third aspect of the present invention, when recording information on a rewritable optical recording medium, a rewriting number recording area is recorded inside the lead-in area of the disc-shaped optical recording medium according to the number of rewriting. The above-mentioned problem can be solved by not writing any more data once the number of times has been reached.

According to the fourth aspect of the present invention, when recording information on a rewritable optical recording medium, a test signal is provided at a part of the lead-in area or inside the lead-in area of the disc-shaped optical recording medium every time the information is written. A rewrite prevention method in which a rewrite prevention signal is provided in a part of the lead-in area or inside the lead-in area, which detects the signal quality by rewriting the test signal every time the signal quality deteriorates. A recording method for an optical recording medium is provided in which recording is performed in a signal area, and the rewrite prevention signal is generated by irradiating a DC beam to increase the reflectance of the rewrite prevention signal area or by using RF (Radio Frequency) at a predetermined frequency. ) signal obtained by recording the signal in the rewrite prevention signal area can be used.

According to the fifth aspect of the present invention, in order to prevent information recorded on a rewritable optical recording medium from being erased by mistake, erasure of recorded information is prevented by attaching and removing a label to the optical recording medium. A recording method for an optical recording medium is provided.

[Function] According to the first aspect of the present invention, in order to solve the above-mentioned problems, a printed matter that can be detected visually or optically is printed, for example, on a label portion on the inner circumference of an optical disk. It is desirable that the printing be in the form of a bar, such as a bar code. The information recording device incorporates a printing device that can print this bar-shaped mark, and each time the entire surface is erased, a bar-shaped mark is added to the label section in the circumferential direction so that it can be read when rewriting. do.

According to the second aspect of the present invention, for example, a signal quality detection section for rewriting such as an error rate detection section is provided near the inner circumference of an optical disk, and data is recorded in the detection section for each batch erase, and the error rate is Measure.

Then, when this error rate becomes larger than a predetermined value, the above problem can be solved by sending a message or applying protection to prevent rewriting.

According to the third aspect of the present invention, for example, an optical disc (CD
) by providing an area inside the lead-in area for recording the number of rewrites, reading the number of rewrites every time the data is rewritten, and providing a mechanism that prevents rewriting once the predetermined number of rewrites has been reached. The above problem can be solved.

According to the fourth aspect of the present invention, for example, an optical disc (CD
) A test signal area is provided inside a part of the lead-in area or the lead-in area, and the test signal is also rewritten each time it is rewritten. When the signal quality deteriorates, the signal that cannot be rewritten any more is transferred to the disk. It can be recorded and prevented from being rewritten.

As a rewriting prevention signal, for example, an area for recording a rewriting prevention signal in a part of the lead-in area or inside the lead-in area of an optical disc (CD) is set, and when a deterioration in signal quality is detected, a DC beam is irradiated. By doing so, rewriting can be prevented by increasing the reflectance of the prevention signal area (putting it in a recording state) or by recording an RF multiplied signal of a predetermined frequency in the prevention signal area.

According to the fifth aspect of the present invention, for example, by attaching and detaching a label to the label portion of an optical disc, it is possible to prevent erroneous recognition and erasure of recorded information.

〔Example〕

Preferred examples of each aspect of the present invention will be described below, but it goes without saying that the technical scope of the present invention is not limited to these examples.

Fruit 11 Life 1 Preferred embodiments of the first aspect of the present invention are shown in FIGS.
Shown in (d).

FIG. 1(a) shows the structure of an optical disc according to the present invention.

This disk 1 has a diameter of 120 mm, and information is recorded outward from the inner circumference of 50 mm, and the number of rewrites is printed on the label portion of the inner circumference from 50 mm as shown in the figure. FIG. 1(b) shows an example of a printing mechanism for, for example, a bar-shaped mark. The bar-shaped mark 2 is printed by the print head 3 on the rewrite recording section (namely, the label section on the inner circumference of the disk) 2.

This printing is recorded once each time the entire surface of the disk is erased, for example, by uniformly irradiating a constant amount of laser light from the inside to the outside of the disk, and can be visually confirmed. For example, the specific specifications of the bar-shaped printing section can be as follows.

(1) Printing range: Inside the disc lapel, diameter 41-46
Between mm (2) Print size: 5.0 mm in the second radial direction, 0.0 mm in the circumferential direction.
5mm (3) Printing interval 20.5+nm (no gap between printings) Next, an example of a reading mechanism for a bar-shaped mark, for example, is shown in FIGS. 1(C) and 1(d). Light from a light emitting section 4 hits the bar-shaped portion printed in black, and the reflected light is read by a light receiving section (photodetector) 5. This reading can be performed at a very high speed while the disk l remains in a rotating state. For example, the specific specifications of the printing and reading mechanism can be as follows.

(1) Print head drive: Mechanical (2) Readout light emitting unit, two light emitting diodes, lens (3)
Reading light receiving section: Lens, photodiode (4) Beam diameter on disk: 0.2 mmΦ (5) Disk rotation control 2. Read the printed part while rotating at a rotation speed of 2 rpm.

Additionally, perform new printing. When reading and printing After finding the last part of Immediately drives the print head to print.

In this manner, according to the present invention, information can be rewritten until a predetermined limit number of rewrites is reached, and the rewriting operation can be automatically prohibited when the number of rewrites reaches a predetermined number.

A preferred embodiment of the second aspect of the present invention is shown in FIGS. 2(a) and (b).

FIG. 2(a) shows the formatting status of the optical disc I, and the lead-in information area 6 is located at the innermost circumference of the data (this lead-in information area usually contains information such as the number of music tracks, etc. recorded in the data area). (This is an area where music information such as performance time and performance start time is recorded.) In the present invention, the error rate of this lead-in information area 6 is detected, and when this value exceeds a certain value, a write prohibition message is issued. The optical recording medium is, for example, In-5b and has a film thickness of 70 nm. The error rate for this medium is typically 5×
10-6, and for example, this error rate is lXl0-
When the number reaches 5, rewriting is prohibited.

Note that a normal CD player has a mechanism that cannot perform autofocus or autotrunking if the lead-in area cannot be detected, but if you use a rewritable CD writing/erasing device, there is no lead-in information. However, since autofocus and autotracking can be performed using only the pregroup, there is no need to separate the lead-in and error rate detection areas (one lead-in area is enough to detect the error rate.

FIG. 2(b) shows an example of a circuit diagram of a rewriting determination circuit in an optical disk drive device. When reading the lead-in information, a detector detects errors in that information. The read information signal is reproduced in an error detection circuit, and the error rate is calculated by comparing it with the lead-in information recorded in the memory circuit before erasing. When the error rate is below a predetermined value, the information is taken into the memory circuit, and when the error rate is above the predetermined value and the number of errors increases, the error processing circuit outputs an error message to the display circuit, and the protection circuit prohibits rewriting.

Fuzenma J A preferred embodiment of the third aspect of the present invention is shown in FIGS. 3(a) and (b).

FIG. 3(a) shows the formatting status of the optical disc 1. As shown in FIG. 3(a), there is a lead-in area 7 at the innermost circumference of the data, and inside this lead-in area 7, the number of rewrites is recorded according to the present invention, and a rewrite number recording area 8 is used to read the number of rewrites. The number of rewrites is recorded by appropriate means (for example, a digital signal) each time the rewrite is performed. When the number of rewrites reaches a predetermined limit, the user is notified of the number of rewrites by displaying the number of rewrites to stop the rewrite, or the rewrite is automatically prohibited. In addition, in FIG. 3(a), 9 is a program area;
IO indicates a lead-out area.

FIG. 3(b) is a circuit diagram showing an example of a rewriting determination circuit, and the information recording and reproducing circuit is a circuit that records and reproduces information, and stores the number of times code information from an optical disk is rewritten from the optical head 11. It functions to count (+1) and record the number of times on the disk.

The number of times check circuit compares the number of rewrites read by the information recording/reproducing circuit with a specified predetermined limit number of rewrites,
When a predetermined number of times is reached, a signal is sent to the protect circuit and the message circuit to stop or prohibit rewriting. The message circuit functions to display the number of rewrites and whether or not rewriting is possible, and the protect circuit receives a signal from the number of times check circuit and automatically prohibits rewriting if necessary.

Preferred embodiments of the fourth aspect of the present invention are shown in FIGS. 4(a) to 4(a).
Shown in (d).

4(a) and (b) schematically show the structure of the optical disc 1 according to the present invention. FIG. 4(a) shows the test signal area (or prevention signal area) 13 inside the lead-in area 12. FIG. 4(b) shows the case where the test signal area (or prevention signal area) 13 is provided in the lead-in area 1.
In both drawings, 14 indicates a program area, and 15 indicates a lead-out area.

According to the present invention, for example, a circuit as shown in FIG.
The lz test signal can be written every time it is rewritten.

For example, a signal with a bit length of 1 μm is used as a test signal, and this signal is rewritten each time it is rewritten, and when the signal quality becomes, for example, 40 dB or less, the rewriting is stopped.

In this way, when the signal quality (C/N) becomes, for example, 40 dB or less, a high-power (approximately 10 mW) DC beam is irradiated, the recording state is set (reflection is serious), and the signal is directed toward the player. If a mechanism is provided that prevents the signal from entering the lead-in area when the reflectance exceeds a certain value, the signal in the program area can be protected.

FIG. 4(d) shows an example of the circuit of the test signal detection device, which detects the test signal of the optical disk l and
Compare the reference voltage and the measured value using a comparator in the arithmetic circuit shown in Figure (d), and if the C/N value is 40 dB or less, control the LD power supply so that the output does not exceed the read power. Can be done.

Practical Example A preferred embodiment of the fifth aspect of the invention is shown in FIGS. 5(a) and (b).

In this embodiment, as shown in FIG. 5(a), the optical disc 1
A label 16 is attached to the center of the screen so that the reflectance is different, and as shown in FIG. Information can be deleted for.

Next, when this label 16 is removed, the difference in reflectance disappears.
Configure the LD controller so that it is locked and cannot be erased.

〔Effect of the invention〕

According to the present invention, as described above, there is provided an optical recording medium such as an erasable/rewritable optical disk that has high reliability in retaining information. Further, according to the present invention, recording information can be reliably prevented by providing an erasure prevention mechanism on the optical recording medium.

[Brief explanation of the drawing]

FIGS. 1(a) to (d) are explanatory diagrams showing a first embodiment of the recording method of the optical recording medium of the present invention, and FIGS. 2(a) and (b) are explanatory diagrams showing the optical recording medium of the present invention. 3(a) and 3(b) are explanatory diagrams showing a third embodiment of the recording method of the optical recording medium of the present invention; FIG. 4(a) to (d) are explanatory diagrams showing the fourth embodiment of the recording method of the optical recording medium of the present invention, and FIG. 5(a) and (1)) are explanatory views showing the fourth embodiment of the recording method of the optical recording medium of the present invention. It is an explanatory view showing a fifth embodiment of a recording method of a medium. l... Optical disk, 2... Bar-shaped mark, 3... Print head, 4... Light emitting section, 5... Light receiving section, 6...
Lead-in area, 7... Lead-in area, 8... Rewriting number recording area, 9... Program area, 10...
・Leadout area, 11...Optical head, 12...
・Lead-in area, 13...Test signal area (write prevention signal area) 14・
...Program area, ]5 Lead-out area, 16...
·label. (b) (C) (CI) (a) (b) (C) (a) (b)

Claims (1)

[Claims] 1. When recording information on a rewritable optical recording medium, a pattern corresponding to the number of times of erasure is recorded on a label portion of the inner circumference of the disk-shaped optical recording medium according to the number of times of erasure. A recording method for an optical recording medium characterized in that no further writing is performed once the number of times of writing is reached. 2. When recording information on a rewritable optical recording medium, the signal quality of rewriting is detected every time data is erased, and if the signal quality deteriorates below the limit value, no further writing is performed. A recording method for optical recording media. 3. When recording information on a rewritable optical recording medium, record an area for recording the number of rewrites inside the lead-in area of the disc-shaped optical recording medium according to the number of rewrites, and when a predetermined number of times is reached, write no more. A recording method for an optical recording medium that is characterized by preventing 4. When recording information on a rewritable optical recording medium, a test signal area is provided as a part of the lead-in area or inside the lead-in area of the disc-shaped optical recording medium each time it is rewritten, and a test is performed every time it is rewritten. The signal quality is detected by rewriting the signal, and if the signal quality deteriorates, a rewriting prevention signal that cannot be rewritten is recorded in a part of the lead-in area or in a rewriting prevention signal area provided inside the lead-in area. A recording method for an optical recording medium characterized by: 5. The recording according to claim 4, wherein the rewrite prevention signal is a signal obtained by irradiating a DC beam to increase the reflectance of the rewrite prevention signal area or by recording an RF signal of a predetermined frequency in the rewrite prevention signal area. method. 6. A recording method for optical recording media that prevents erasure of recorded information by attaching and removing a label to the optical recording medium in order to prevent information recorded on a rewritable optical recording medium from being mistakenly erased. .