JPH09204666A - Optical recording medium and optical recorder/ reproducer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a highly reliable optical recording medium and an optical recorder/reproducer in which perfect error free reproduction of address information and recording/reproducing data is realized for an optical disc having different width of guide groove between address information recording section and data recording/reproducing section. SOLUTION: The recording medium has an address information section where address information is formed on an information track having a guide groove 2, and a data recording/reproducing section. The width of guide groove is different between the address information section and recording/reproducing section wherein the dimension L1 from the varying position of guide groove to the address information bit position at address recording section, and the dimension L2 from the varying position of guide groove to the data bit position at data recording/reproducing section are set longer than a length corresponding to the time constant T of a reproduction amplifier. Consequently, perfectly error free reproduction of address information and recording/reproducing data can be realized and thereby highly reliable high density recording is realized.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical recording medium such as an optical disk and an optical recording / reproducing apparatus for irradiating light of a semiconductor laser to record / reproduce signals.

[0002]

2. Description of the Related Art In recent years, optical recording media such as optical discs and optical recording / reproducing devices have come to perform computer data recording, audio recording, and video recording, and there is a demand for higher density recording. . By the way, an optical recording medium such as an optical disc has a guide groove for guiding a laser beam, and data is recorded / reproduced on / from a guide groove portion or a track between the guide grooves. When data is recorded / reproduced on a track between the guide grooves, an address recording part is provided in a part of the track, and the address information is formed by uneven bits. Here, in order to increase the recording density, it is necessary to narrow the recording track width and increase the number of tracks on the disc. By the way, structurally, the disc has a resin layer formed on the recording film. When this resin is molded on the recording film, it is necessary to fill the inside of the guide groove with the resin reliably. If air is left inside the guide groove without being reliably filled with resin, the laser light will be diffused, signal recording will not be performed reliably during recording, and errors will be detected as noise during playback. Will be lost. Since the address information of the address recording section is formed by the uneven bit inside the track between the guide grooves,
The area most difficult to fill with the resin is between the concave / convex bit having the smallest address information and the guide groove.

Therefore, when the track width is narrowed to increase the recording density of the disk, the concavo-convex bit is formed in the data portion with a narrower track width and the address information portion with a wider track width, and the resin is filled. I am sure it will be done. Thus, the guide groove widths of the address information section and the data recording / reproducing section are changed. FIG. 6 shows one track of a conventional optical recording medium.

FIG. 7 is a block diagram showing a conventional optical recording / reproducing apparatus. In FIG. 6, 1 is a track having an address information section and a data recording / reproducing section, 2 is a guide groove, and 3 is a laser beam spot by an optical head. In FIG. 7, reference numeral 4 is an optical disk which is a recording medium, and 5 is an optical disk 4.
A disk motor for rotating the optical disk, 6 an optical head for outputting a laser beam to record and reproduce a signal on the optical disk 4, and 7 a reproduction amplifier for amplifying the reproduction signal detected by the optical head 6,
Reference numeral 8 denotes a binarization circuit that binarizes the reproduction signal amplified by the reproduction amplifier 7, and 9 calculates the binarized reproduction signal by the binarization circuit 8 and outputs data, and a recording signal is input from the input data. A signal processing circuit for generating 10 is a recording circuit for recording the recording signal generated by the signal processing circuit 9, and 11 is a track control circuit.

When the optical disk 4 rotates, the optical head 6 moves to the right on the track and alternately passes through the address information section and the data recording / reproducing section. When the optical disk 4 is reproduced, a signal is detected by the change in the amount of reflected light from the optical disk 4. The amount of laser reflected light during reproduction is larger when the guide groove width is wider than when the guide groove width is narrow, and the reproduction signal fluctuates like a DC when the guide groove width changes. Since the reproduction amplifier is AC-coupled, the DC fluctuation due to the guide groove change is superimposed on the reproduction signal as a fluctuation waveform according to the time constant of the circuit.

At the time of recording, the address information in the address information section on the track of the optical disk 4 is reproduced by the optical head 6 and the reproduction amplifier 7, and the binarization circuit 8 detects the reproduction amplifier output signal at the detection threshold level. It is converted into a digital signal and detected by the signal processing circuit 9. The track control circuit 11 searches the track of the target address to be recorded while detecting the address information. After the search, the signal processing circuit 9 calculates the input data and outputs it as a recording signal. The recording circuit 10 records the recording signal from the signal transmission circuit 9 in the data recording / reproducing section on the track.

At the time of reproduction, the address information in the address information section on the track of the optical disk 4 is reproduced by the optical head 6 and the reproduction amplifier 7, and the binarization circuit 8 detects the reproduction amplifier output signal at the detection threshold level. Eventually, it is converted into a digital signal and detected by the signal processing circuit 9. The track control circuit 11 searches for the track of the target address to be reproduced while detecting the address information. After the search, the optical head 6 and the reproducing amplifier 7 reproduce the signal written in the data recording / reproducing section on the track, and the binarizing circuit 8 reproduces the reproducing amplifier 7.
The output signal from the binarization circuit is binarized into a digital signal by detecting it at the detection threshold level, and the signal processing circuit 9 operates the digital signal from the binarization circuit 8 and outputs the data.

[0008]

As shown in FIG. 6, when the dimension from the guide groove width changing position to the address information is short, the DC of the reproduction signal waveform is reproduced in the reproduction of the address information during recording and reproduction.
During the change, the address information is detected at the detection threshold level, and the start part of the address information becomes undetectable.

[0009] Further, in reproducing the data,
If the dimension from the guide groove width change position to the data is short, the data is detected at the detection threshold level during the DC fluctuation of the reproduction signal waveform, and the start portion of the data is erroneously detected. In this way, the binarization circuit erroneously outputs the address information and data recorded on the track.

According to the present invention, address information and recording / reproducing data are
It is an object of the present invention to provide a highly reliable optical recording medium and an optical recording / reproducing device that can be reproduced without causing any false detection.

[0011]

An optical recording medium and an optical recording / reproducing apparatus according to the present invention include an address information section in which address information is formed by concavo-convex bits on an information track having a guide groove.
A data recording / reproducing unit is provided, and the guide groove width of the address information unit and the guide groove width of the data recording / reproducing unit are different, and the dimension L1 from the guide groove width changing position to the address information bit position of the address recording unit.
Is longer than the length corresponding to the time constant T of the reproducing amplifier.

As a result, it is possible to obtain an optical recording medium and an optical recording / reproducing apparatus which have a high recording density and can reproduce the address information without any erroneous detection.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 of the present invention comprises an information track having a guide groove, an address information section having address information formed by concavo-convex bits, and a data recording / reproducing section. The guide groove width of the information section and the guide groove width of the data recording / reproducing section are different, and the dimension L1 from the guide groove width changing position to the address information bit position of the address recording section is a length corresponding to the time constant T of the reproducing amplifier. The optical recording medium and the optical recording / reproducing device as described above have an effect that address information can be reproduced without any erroneous detection.

According to the second aspect of the present invention, the dimension L1 from the guide groove width changing position to the address information bit position of the address recording section is continuous or stepwise from the inner circumference to the outer circumference of the disc. The optical recording medium and the optical recording / reproducing apparatus according to claim 1, which vary, when used at a constant number of revolutions, can reproduce the address information from the inner circumference to the outer circumference without any erroneous detection. Has the effect of.

According to a third aspect of the present invention, an information track having a guide groove has an address information section in which address information is formed by concavo-convex bits, and a data recording / reproducing section. The groove width and the guide groove width of the data recording / reproducing section are different,
In the optical recording medium and the optical recording / reproducing apparatus, the dimension L2 from the guide groove width changing position to the data recording position of the data recording / reproducing unit is a length corresponding to the time constant T or more of the reproducing amplifier. , And has the effect that reproduction can be performed without any false detection.

According to a fourth aspect of the present invention, the dimension L2 from the guide groove width changing position to the data recording position of the data recording / reproducing portion is continuous or stepwise from the inner circumference to the outer circumference of the disk. The optical recording medium and the optical recording / reproducing apparatus according to claim 3, which vary, when used at a constant number of revolutions, can reproduce data from the inner circumference to the outer circumference without any erroneous detection. Have an effect.

According to a fifth aspect of the present invention, an information track having a guide groove has an address information section in which address information is formed by concavo-convex bits and a data recording / reproducing section, and guides the address information section. The groove width and the guide groove width of the data recording / reproducing section are different,
The dimension L1 from the guide groove width changing position at the time of forward rotation to the address information bit position of the address recording section is equal to or longer than the length corresponding to the time constant T of the reproducing amplifier, and the guide groove width changing at the time of counter rotation. An optical recording medium and an optical recording / reproducing apparatus in which the dimension L3 from the position to the address information bit position of the address recording section is equal to or longer than the length corresponding to the time constant T of the reproducing amplifier. When using with 2 heads,
If the upper surface is in the normal rotation, the lower surface is in the reverse rotation, and the running direction of the head with respect to the groove has an opposite relationship, but in both cases, the address information can be reproduced from both sides without erroneous detection. Has the effect of. In addition, when making a disc, there are 2 for normal rotation and 2 for reverse rotation.
It is not necessary to make discs with different types of groove-shaped stampers and stick them up and down, and you can make discs made with one stamper on both top and bottom sides without using two stampers. This has the effect of reducing the production cost and simplifying the disc production process.

According to a sixth aspect of the present invention, the dimensions L1 and L3 from the guide groove width changing position to the address information bit position of the address recording portion are continuous or stepwise from the inner circumference to the outer circumference of the disc. The optical recording medium and the optical recording / reproducing apparatus according to claim 5, wherein when used at a constant number of revolutions, the information is reproduced from both sides from the inner circumference to the outer circumference without any erroneous detection of address information. It has the effect of being able to.

According to a seventh aspect of the present invention, an information track having a guide groove has an address information section in which address information is formed by concavo-convex bits and a data recording / reproducing section, and guides the address information section. The groove width and the guide groove width of the data recording / reproducing section are different,
The dimension L2 from the guide groove width changing position at the time of forward rotation to the data recording position of the data recording / reproducing section is equal to or more than the length corresponding to the time constant T of the reproducing amplifier, and the guide groove width changing at the time of counter rotation. An optical recording medium and an optical recording / reproducing device in which a dimension L4 from a position to a data recording position of a data recording / reproducing unit is equal to or longer than a length corresponding to a time constant T of a reproducing amplifier. When used with two heads, the data can be reproduced from both sides without any false detection.

According to an eighth aspect of the present invention, the dimensions L2 and L4 from the guide groove width changing position to the data recording position of the data recording / reproducing section are continuous or stepwise from the inner circumference to the outer circumference of the disc. The optical recording medium and the optical recording / reproducing apparatus according to claim 7, wherein the data is reproduced from both sides from the inner circumference to the outer circumference without any erroneous detection when used at a constant rotation speed. It has the effect of being able to.

Hereinafter, embodiments of the present invention will be described. (Embodiment 1) FIG. 1 shows one track of an optical recording medium according to an embodiment of the present invention. FIG. 2 is a block diagram showing an optical recording / reproducing apparatus according to an embodiment of the present invention.

In FIG. 1, 1 is an address information section, a track having a data recording / reproducing section, 2 is a guide groove, 3 is a laser beam spot by an optical head, L1 is the guide groove width change position, and the address information of the address recording section. Dimension up to bit position, L2
Is the dimension from the guide groove width changing position to the data recording position of the data recording / reproducing unit, and T is the time constant of the reproducing amplifier. In FIG. 2, 4 is an optical disk which is a recording medium, 5 is a disk motor for rotating the optical disk 4, 6 is an optical head for outputting a laser beam to record and reproduce a signal on the optical disk 4, and 7 is reproduction detected by the optical head 6. A reproduction amplifier for amplifying the signal, 8 is a binarization circuit for binarizing the reproduction signal amplified by the reproduction amplifier 7, and 90 is for calculating the binarized reproduction signal by the binarization circuit 8 and outputting the data. A signal processing circuit for generating a recording signal from input data, 10 is a signal processing circuit 9
A recording circuit for recording the recording signal generated in step 11 and a track control circuit 11.

When the optical disk 4 rotates, the optical head 6 moves to the right in the track and alternately passes through the address information section and the data recording / reproducing section. When recording, optical disc 4
The address information of the address information section on the track is the optical head 6,
The signal is reproduced by the reproduction amplifier 7 and converted into a digital signal by detecting the reproduction amplifier output signal at the detection threshold level by the binarization circuit 8 and then detected by the signal processing circuit 9. The track control circuit 11 searches the track of the target address to be recorded while detecting the address information. After the search, the signal processing circuit 90 calculates the input data, and records at the timing when the dimension L2 from the guide groove width changing position to the data recording position becomes a length corresponding to the time constant T of the reproducing amplifier or more. Start outputting signals. The recording circuit 10 records the recording signal from the signal transmission circuit 9 in the data recording / reproducing section on the track.

During reproduction, the address information in the address information section on the track of the optical disc 4 is reproduced by the optical head 6 and the reproduction amplifier 7, and the binarization circuit 8 detects the reproduction amplifier output signal at the detection threshold level. Eventually, it is converted into a digital signal and detected by the signal processing circuit 9. The track control circuit 11 searches for the track of the target address to be reproduced while detecting the address information. After the search, the optical head 6 and the reproducing amplifier 7 reproduce the signal written in the data recording / reproducing section on the track, and the binarizing circuit 8 reproduces the reproducing amplifier 7.
The output signal from the binarization circuit is binarized into a digital signal by detecting it at the detection threshold level, and the signal processing circuit 9 operates the digital signal from the binarization circuit 8 and outputs the data.

In reproducing the address information at the time of recording and reproducing, the dimension L1 from the guide groove width changing position to the address information bit position of the address recording section is equal to or longer than the length corresponding to the time constant T of the reproducing amplifier. Therefore, the address information can be detected at the detection threshold level after the DC fluctuation of the reproduced signal waveform disappears. Further, since the dimension L2 from the guide groove width changing position to the data recording position of the data recording / reproducing section is a length corresponding to the time constant T of the reproducing amplifier or more, after the DC fluctuation of the reproduced signal waveform disappears, Data can be detected at the detection threshold level. As a result, the binarization circuit accurately outputs the address information and data recorded on the track.

(Embodiment 2) FIG. 3 shows one track of an optical recording medium according to an embodiment of the present invention. FIG. 4 is a block diagram showing an optical recording / reproducing apparatus according to an embodiment of the present invention. In FIG. 3, 1 is an address information section, a track having a data recording / reproducing section, 2 is a guide groove, 3 is a laser beam spot by an optical head, L1 and L3 are guide groove width changing positions, and address information bits of the address recording section. A dimension up to the position, L2 and L4 are dimensions from the guide groove width changing position to the data recording position of the data recording / reproducing unit, and T is a time constant of the reproducing amplifier.

In FIG. 4, reference numeral 40 denotes a recording medium A,
B: an optical disk having both surfaces stuck together, 5: a disk motor for rotating the optical disk 40, 6: an optical head for outputting a laser beam to record / reproduce a signal on the surface A of the optical disk 40,
Reference numeral 7 is a reproduction amplifier for amplifying the reproduction signal detected by the optical head 6, 8 is a binarization circuit for binarizing the reproduction signal amplified by the reproduction amplifier 7, and 90 is reproduction for binarization by the binarization circuit 8. A signal processing circuit that calculates a signal, outputs data, and generates a recording signal from the input data, 10 is a recording circuit that records the recording signal generated by the signal processing circuit 9, and 11 is a track control circuit. The recording / reproducing operation of the A side of 40 is performed.

In FIG. 4, 12 is an optical head for outputting a laser beam to record / reproduce a signal on the B side of the optical disc 40, 13 is a reproduction amplifier for amplifying the reproduction signal detected by the optical head 12, and 14 is a reproduction amplifier. A binarization circuit for binarizing the reproduction signal amplified by 13; and 15 a signal processing for calculating the reproduction signal binarized by the binarization circuit 14 to output data and generating a recording signal from the input data. Reference numeral 16 is a circuit, 16 is a recording circuit for recording the recording signal generated by the signal processing circuit 15, and 17 is a track control circuit.

As the optical disk 40 rotates, the optical head 6 moves right along the track and alternately passes through the address information section and the data recording / reproducing section. At the same time, the optical head 12 moves to the left in the track and alternately passes through the address information section and the data recording / reproducing section. The operation of the optical head 6 during recording and reproduction is similar to that shown in the first embodiment. Further, in the recording and reproducing operations of the optical head 12, the traveling direction of the optical head is reversed, and the dimension L from the guide groove width change position to the address information bit position of the address recording section is L.
3 corresponds to L1 of the first embodiment, and the dimension L4 from the guide groove width change position to the data recording position of the data recording / reproducing unit.
Corresponds to L2 of the first embodiment, so that
Is the same as that shown in.

In reproducing the address information at the time of recording and reproducing, the dimensions L1 and L3 from the guide groove width changing position to the address information bit position of the address recording portion correspond to the time constant T of the reproducing amplifiers A and B. Since the length is equal to or longer than the length, the address information can be detected at the detection threshold level after the DC fluctuation of the reproduction signal waveform disappears. Further, since the dimensions L2 and L4 from the guide groove width changing position to the data recording position of the data recording / reproducing unit are the lengths equal to or more than the time constant T of the reproducing amplifiers 7 and 13, the DC fluctuation of the reproduced signal waveform is caused. The data can be detected at the detection threshold level after the disappearance. As a result, the binarization circuits 8 and 14 are set to A
The address information and data recorded on the tracks on the side B and the side B are accurately output.

(Embodiment 3) FIG. 5 shows a part of an optical recording medium according to an embodiment of the present invention. In FIG. 5, 18 is an address information section, 19 is a data recording / reproducing section, L
1, L3 is the dimension from the guide groove width change position of the inner track 20 to the address information bit position of the address recording section, L
2 and L4 are the dimensions from the guide groove width changing position of the inner track 20 to the data recording position of the data recording / reproducing unit 19, and L5 and L7 are the guide groove width changing position of the outer track 21 and the address recording unit 18. Up to the address information bit position, L6 and L8 are the sizes from the guide groove width change position of the outer peripheral track 21 to the data recording position of the data recording / reproducing section.

In the optical disk used as the CLV system with a constant linear velocity, L1, L2, L from the inner circumference to the outer circumference.
The dimensions of L3, L4 may be the same as L5, L6, L7, L8, respectively. In a disk used as a CAV system with a constant number of rotations, the linear velocity of the outer circumference is higher than that of the inner circumference.
Therefore, in order to make L5, L6, L7, and L8 on the outer circumference longer than the dimension corresponding to the time constant T of the reproducing amplifier, the length is continuously or stepwise increased from the inner circumference to the outer circumference. I have to.

[0033]

As described above, according to the present invention, even if the guide groove width changes between the address information section and the data recording / reproducing section, the address information is recorded and the address information is reproduced.
Address information and data can be reproduced without any erroneous detection, and an optical recording medium and an optical recording / reproducing device which ensure high reliability can be obtained, and the practical effect thereof is great.

According to the present invention, in an optical recording medium and an optical recording / reproducing apparatus for which high density recording is desired, even if the track width is narrowed, it is possible to reproduce the address information and data without erroneous detection. High reliability is obtained, and its practical effect is great. The present invention is an optical recording medium and an optical recording / reproducing apparatus that are attached to each other vertically, and when recording and reproducing with two heads, even if the traveling direction of the optical head is up and down, the address information and the data are recorded. Can be reproduced without any false detection, high reliability can be obtained, and its practical effect is great.

The present invention is an optical recording medium and an optical recording / reproducing apparatus which are laminated to each other in the vertical direction, and when recording / reproducing with two heads, one guide groove shape is used with respect to the traveling direction of the optical heads on the upper and lower sides. , It is possible to reproduce the address information and data without erroneous detection. When creating a disc, it is not necessary to prepare a stamper for the upper surface, a stamper for the lower surface, and two stampers, respectively, and it is possible to create discs on both the upper and lower sides with one stamper, reducing the stamper creation cost, Can be simplified, and its practical effect is great.

According to the present invention, in an optical recording medium and an optical recording / reproducing apparatus used as a CAV method with a constant number of revolutions, it is possible to reproduce address information and data from the inner circumference to the outer circumference without any erroneous detection. Is possible, high reliability is obtained,
Its practical effect is great.

[Brief description of drawings]

FIG. 1 is a diagram showing one track of an optical recording medium according to a first embodiment of the present invention.

FIG. 2 is a block diagram showing an optical recording / reproducing apparatus according to the first embodiment of the present invention.

FIG. 3 is a diagram showing one track of an optical recording medium according to a second embodiment of the present invention.

FIG. 4 is a block diagram showing an optical recording / reproducing apparatus according to a second embodiment of the present invention.

FIG. 5 is a diagram showing a part of an optical recording medium according to a third embodiment of the present invention.

FIG. 6 is a diagram showing one track of a conventional optical recording medium.

FIG. 7 is a block diagram showing a conventional optical recording / reproducing apparatus.

[Explanation of symbols]

 1 Track having information section and data recording / reproducing section 2 Guide groove 3 Laser beam spot by optical head L1 to L4 dimensions

Claims (8)

[Claims] 1. An information track having a guide groove, which has an address information section in which address information is formed by concavo-convex bits and a data recording / reproducing section, the guide groove width of the address information section and the guide groove of the data recording / reproducing section. An optical recording medium and an optical recording / reproducing apparatus in which the widths are different and the dimension L1 from the guide groove width changing position to the address information bit position of the address recording section is equal to or longer than the length corresponding to the time constant T of the reproducing amplifier. 2. The optical recording according to claim 1, wherein the dimension L1 from the guide groove width changing position to the address information bit position of the address recording portion changes continuously or stepwise from the inner circumference to the outer circumference of the disc. Medium and optical recording / reproducing apparatus. 3. An information track having a guide groove, which has an address information section in which address information is formed by concavo-convex bits and a data recording / reproducing section, the guide groove width of the address information section and the guide groove of the data recording / reproducing section. An optical recording medium and an optical recording / reproducing device having different widths, and a dimension L2 from a guide groove width changing position to a data recording position of a data recording / reproducing unit is a length corresponding to a time constant T or more of a reproducing amplifier. 4. The optical recording according to claim 3, wherein the dimension L2 from the guide groove width changing position to the data recording position of the data recording / reproducing portion changes continuously or stepwise from the inner circumference to the outer circumference of the disc. Medium and optical recording / reproducing apparatus. 5. An information track having a guide groove, which has an address information section in which address information is formed by concavo-convex bits and a data recording / reproducing section, the guide groove width of the address information section and the guide groove of the data recording / reproducing section. The width is different, and the dimension L1 from the guide groove width change position to the address information bit position of the address recording section at the time of forward rotation
Is more than the length corresponding to the time constant T of the reproducing amplifier,
An optical recording medium and an optical recording / reproducing apparatus in which the dimension L3 from the guide groove width changing position to the address information bit position of the address recording unit at the time of counter rotation is equal to or longer than the length corresponding to the time constant T of the reproducing amplifier. . 6. The optical system according to claim 5, wherein the dimensions L1 and L3 from the guide groove width changing position to the address information bit position of the address recording portion change continuously or stepwise from the inner circumference to the outer circumference of the disc. Recording medium and optical recording / reproducing apparatus. 7. An information track having a guide groove, which has an address information section in which address information is formed by concavo-convex bits and a data recording / reproducing section, the guide groove width of the address information section and the guide groove of the data recording / reproducing section. The width is different, and the dimension L2 from the guide groove width change position to the data recording position of the data recording / reproducing unit at the time of forward rotation
Is more than the length corresponding to the time constant T of the reproducing amplifier,
An optical recording medium and an optical recording / reproducing apparatus in which the dimension L4 from the guide groove width changing position to the data recording position of the data recording / reproducing unit at the time of counter rotation is equal to or longer than the length corresponding to the time constant T of the reproducing amplifier. . 8. The optical system according to claim 7, wherein the dimensions L2 and L4 from the guide groove width changing position to the data recording position of the data recording / reproducing portion change continuously or stepwise from the inner circumference to the outer circumference of the disc. Recording medium and optical recording / reproducing apparatus.