JPS59188857A - Disk type recording medium and disk device using said recording medium - Google Patents

Abstract

PURPOSE:To detect an indicator in an assured and comparatively simple way by recording plural mark patterns which are recorded in a digital form with a different frequency from those of the address and data areas on an indicator area which indicates the sector boundary. CONSTITUTION:An indicator area (a) has a mark pattern modulated in a digital style with a different frequency from those of an address area (b) and a data area (c) and forms a disk recording medium 1 containing plural patterns different from each other in the area (a) within a sector 3. An amplifier 11 for signal fed from the area (a) which is being read out is provided together with a rise/ fall detector 12 which detects the transition of the bit contained in a signal, pattern demodulator 14, detector 15 for demodulated pattern, detector 13 of the area (a) which detects the presence of the area (a) from the difference of frequency, and a counter 16 respectively. The detector 15 presets the prescribed value to the counter 16 in response to the detection of pattern and performs a counting action to deliver the output of the indicator detector in a prescribed timing mode.

Description

Detailed Description of the Invention (5) Technical Field of the Invention The present invention relates to a disk-shaped recording medium and a disk device using the same, in particular an address area and a data area on an indicator area indicating sector boundaries. The present invention relates to a disk-shaped recording medium in which a plurality of mark patterns are digitally recorded at frequencies different from those of the conventional one, and a sector signal is reliably detected, and a disk device using the same.

(B) Background and problems of the technology Traditionally, data and information that can be detected optically using a radiation beam or a radiation beam and a magnetic field have been used.
2. Description of the Related Art Disc-shaped recording media in which recording is performed in areas and disc devices that utilize the same are known. The recording medium is configured as shown in FIG. 1 (4), for example. That is, on the recording medium 1, there are a plurality of information tracks 2-0.2-1.
. . . is prepared, and the information trunk has multiple sectors 3-1, 3-2, . . . as shown in Figure 1 (C1).
. . , and each sector is comprised of an indicator area a, an address area b, and a data area C, as shown in FIG. 1(A). Note that the indicator area α is, so to speak, sector 3-1.3-2.・・・・・・
The address area B may be considered to indicate the boundary between the areas B, .

Figure 1 (The cup is the information track 2-0 of the substrate 4 of the recording medium 1.
．． 2-1. . . . , a track guide groove 5-0.5-1.・
Each information track is composed of...

That is, the information trunk 2-0 is placed on the track guide groove 5-θ,
The information track 2-1 is placed on the track guide groove 5-1...
...Information is recorded by forming unevenness or bits in the direction along each track.

Although it depends on the type of recording medium 1, the data area C can generally be considered as a user writing area. but,
The indicator area α and the address area b may be considered to be read-only areas, and information is added in advance in a relief shape in the circumferential direction when the disc medium is manufactured. When reproducing information from the indicator area a, address area b, and data area C, the information track 2-0.2-1. ...
The track guide groove 5-0.5-1 in the direction facing...
The laser beam is caused to travel while tracking ゜... using the depth of the groove. During this time, the information recorded as described above is read.

Conventionally, the structure is as described above, but the above-mentioned indicator
The area α indicates the boundary of each sector, and it is desirable to correctly detect the indicator area α.

(0) Object and Structure of the Invention The purpose of the present invention is to solve the above-mentioned problems, and in the disk-shaped recording medium of the present invention, a plurality of information tracks are each divided into a plurality of sectors, and each sector is divided into a plurality of sectors. , a data area that can be recorded as optically detectable information using a radiation beam or using a radiation beam and a magnetic field, and an address area in which address information is recorded;
In a disk-shaped recording medium configured to include at least an indicator area marker indicating the boundary of each sector, the indicator area and the address area have an optically detectable relief structure, and the indicator area and the address area have an optically detectable relief structure; The address area l2 records address information in a digitally encoded form similar to the data area, and the indicator area is digitally modulated at a frequency different from that of the address area and data area. The indicator bag area of one sector has a plurality of mark patterns, and the plurality of mark patterns in the indicator bag area within one sector are different from each other.

Further, the disk device of the present invention is characterized by having a configuration that utilizes a disk-shaped recording medium having the above characteristics.

This will be explained below with reference to the drawings.

(D) Embodiment of the Invention FIG. 2 shows the aspect of the indicator area and the indicator area in an embodiment of the disk-shaped recording medium of the present invention.
FIG. 3 is an explanatory diagram illustrating the aspect of area detection, and shows the main part configuration of an embodiment of the disk device of the present invention.

In the case of the disk-shaped recording medium of the present invention, as typically shown in the bottom row of FIG. By doing so, in the indicator area detector described later with reference to FIG. 3, the fundamental frequency of the area α can be detected by detecting the fundamental frequency of the area α. However, it is not enough to extract only the frequency component; a predetermined mark pattern is written in the indicator area It is done to ensure the detection of the arrival of area α.

2 shows the recording mode of information in the indicator area α. In the case shown in the figure, three mark patterns 6, 7, and 8 are written with gap portions 9 in between. FIG. 3 shows the configuration of an embodiment of the disk device, in which reference numeral 10 is a photodetector;
is an amplifier, ] 2 is a rising edge #)/falling edge detector, 13 is an indicator area detector, 14 is a demodulator, 15 is a pattern detector, and 16 is a counter.

By reading the recorded information on the indicator area α as shown in the uppermost part of FIG. 2, the output signal (dl) of the amplifier 11 becomes as shown in FIG. 12 detects the rising and falling points of the signal (dl) and generates an output signal (e) as shown in FIG. ) and outputs an output signal th> indicating that indicator area a has arrived.

On the other hand, the demodulator 14 receives the signal (e) and extracts the clock signal (f) as is known in the art.
A demodulated signal (9) is generated by checking whether a nox exists in the signal (e) between the two clock signals. Note that the above signal (d) is F'M modulated or MFM
It can be considered that recorded information is read in a modulated form.

The above signals (fl, gl, (Al) are supplied to the pattern detector 15, and the pattern detector 15 operates as follows.

That is, marks 6, 7, and 8 shown in FIG. 2 are designed to have different patterns within the same indicator area α.

In the case shown in Figure 2 (2), the first mark II % turn 6 has rlloolJ, and the pattern is arbitrary for each indicator area α; Correspondingly, in the case shown, the pattern detector 15 emits a signal (j+) which presets the counter 16 with the value "22". Thereafter, the counter 16 counts down by -1. Then, the pattern detector 15 uses, for example, roloolJ.
When a second mark pattern 7 such as
2'' to the counter 16 (emits a force).

Incidentally, at this point, the counter 16 increments the previously set value "22" by -1 until it reaches the exact value "12".
Alternatively, it can be considered that it is determined to be in the vicinity. Moreover, the pattern detector 15 is, for example, rlollJ
When detecting the third mark pattern 8 such as
A signal (k) for presetting the counter 16 is generated. At this point, the counter 16 also has the value "2" corresponding to the previously cent value "22" or "12".
Alternatively, it can be considered that it is determined to be in the vicinity.

By doing this, when the pattern detector 15 detects any one of the first mark pattern 6 to the third mark pattern 8, the counter 16
performs down counting, and when the counter value reaches a predetermined value (for example, "1") or the pattern detector 15
is the first mark φ pattern 6 to the third mark.
When any one of the patterns 8 is detected, the counter 16 counts down until the counter value reaches a predetermined value (for example, "1") and the indicator area detector 13 emits a signal (hl). When the indicator is detected, the indicator detection signal (2) is generated.This improves the indicator detection accuracy and guarantees the detection position accuracy, so that subsequent reading of address area b, etc. can be performed correctly.

(E1 As described in detail of the invention, according to the present invention, it is possible to detect the indicator reliably and relatively easily.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram illustrating the relationship between a disk-shaped recording medium, sectors, information tracks, and areas including indicator areas, and FIG. 2 is an indicator area in an embodiment of the disk-shaped recording medium according to the present invention. Explanatory diagram illustrating the mode of indicator area detection and the mode of indicator area detection, 3rd
The figure shows the main part configuration of an embodiment of the disk device of the present invention. In the figure, 1 is a disk-shaped recording medium, 2 is an information track, and 3 is a disk-shaped recording medium.
are sectors, 6, 7.8 are mark e patterns, 10 is a photodetector, 11 is an amplifier, 12 is a riser, ! ll
13 is an indicator area detector, 14 is a demodulator, 15 is a pattern detector, and 16 is a counter. Patent applicant Fujitsu Limited

Claims (2)

[Claims] (1) A plurality of information tracks are each divided into a plurality of sectors, each sector containing optically detectable information and data that can be recorded using a radiation beam or using a radiation beam and a magnetic field. In a disk-shaped recording medium configured to have at least a small area, an address area in which 7-trace information is recorded, and an indicator area that indicates the boundary of each sector, the indicator area is , the address area is provided with an optically detectable relief structure, address information is recorded in the same digitally encoded form as in the data area, and the indicator is recorded in the address area. The area has a plurality of mark ψ patterns digitally modulated with a frequency different from that of the address area and data area, and the plural mark patterns in the indicator 9 area within one sector are mutually ζ2. A disk-shaped sickle medium characterized by different mark patterns. (2) The plurality of information tracks are each divided into a plurality of sectors, each sector containing optically detectable information and data that can be recorded using a radiation beam or using a radiation beam and a magnetic field. A disk-shaped recording medium having at least an area, an address area in which address information is recorded, and an indicator area indicating the boundary of each sector, the indicator area and the address area The address area has an optically detectable relief structure, and address information is recorded in the same digital (encoded) form as in the cheater area, and the indicator area has an optically detectable relief structure. address 12, data
A disk-shaped recording medium is used, which has a plurality of mark patterns that are digitally modulated with a frequency different from that of the area, and in which the plurality of mark patterns in the indicator area within the sector are different mark patterns. an amplifier configured to amplify a signal from the indicator area being read out;
a rising/falling detector for detecting transitions of bits in the signal; a demodulator for demodulating the mark pattern; a pattern detector for detecting the mark pattern demodulated by the demodulator; and a counter. an amplifier for amplifying a signal from the indicator area being prepared or being read; a rising/falling detector for detecting transitions of bits in the signal; and a demodulator for demodulating the mark pattern; a pattern detector for detecting the mark pattern demodulated by the demodulator; an indicator area detector for detecting the presence of an indicator area based on the frequency difference; and a counter; Multiple marks/
A predetermined value is preset in the counter in response to pattern detection, and the counter performs a counting operation based on the preset value and outputs an indicator detection output at a predetermined timing. disk device.