JP3282479B2 - Optical recording medium and optical recording / reproducing device - Google Patents

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 recording and reproducing signals by irradiating a semiconductor laser.

[0002]

2. Description of the Related Art In recent years, optical recording media such as optical discs and optical recording / reproducing apparatuses have been used for 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 disk has a guide groove for guiding a laser beam, and data is recorded / reproduced on / from the guide groove 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 disk. By the way, the disc is structurally formed with a resin layer 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 the resin being filled securely, the laser light will be diffused by this, and signal recording will not be performed reliably during recording, or errors will be detected as noise during reproduction. Would be. Since the address information of the address recording section is formed by uneven bits inside the track between the guide grooves,
The resin is most difficult to fill between the concave / convex bit of the address information having the smallest dimension and the guide groove.

In order to increase the recording density of the disk by reducing the track width, the track width is narrowed in the data portion and the unevenness bit is formed in the wider track width in the address information portion. Make sure it is 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, 4 is an optical disk as a recording medium, and 5 is an optical disk 4.
, A disk motor for outputting a laser beam to record and reproduce a signal on the optical disk 4, a reproduction amplifier for amplifying a reproduction signal detected by the optical head 6,
Reference numeral 8 denotes a binarization circuit for binarizing the reproduction signal amplified by the reproduction amplifier 7, and 9 calculates the reproduction signal binarized by the binarization circuit 8, outputs data, and converts a recording signal from the input data. A signal processing circuit for generating the signal, a recording circuit 10 for recording the recording signal generated by the signal processing circuit 9, and a track control circuit 11 are provided.

As the optical disc 4 rotates, the optical head 6 advances rightward on the track and passes through the address information section and the data recording / reproducing section alternately. In the reproduction of the optical disk 4, a signal is detected based on a change in the amount of reflected light from the optical disk 4. The laser reflected light amount during reproduction is larger when the guide groove width is wide than when it is narrow, and the reproduction signal fluctuates in a DC manner when the guide groove width changes. Since the reproduction amplifier is AC-coupled, the DC fluctuation due to the change in the guide groove is superimposed on the reproduction signal as a fluctuation waveform corresponding to the time constant of the circuit.

At the time of recording, the address information of the address information section on the track of the optical disc 4 is reproduced by the optical head 6 and the reproducing amplifier 7, and the binarizing circuit 8 detects the reproducing amplifier output signal at the detection threshold level. The signal is converted into a digital signal and detected by the signal processing circuit 9. The track control circuit 11 searches for a track at a target address to be recorded while detecting address information. If the search is successful, 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 home circuit 9 in the data recording / reproducing section on the track.

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

[0008]

As shown in FIG. 6, if the dimension from the guide groove width change position to the address information is short, in reproducing the address information during recording and reproduction, the DC of the reproduced signal waveform is reduced.
During the change, the address information is detected at the detection threshold level, and the start of the address information cannot be detected.

In data reproduction at the time of reproduction,
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. As described above, the binarization circuit erroneously outputs the address information and data recorded on the track.

According to the present invention, address information and recording / reproduction data are
An object of the present invention is to provide a highly reliable optical recording medium and an optical recording / reproducing apparatus which can reproduce data without any erroneous detection.

[0011]

According to the present invention, there is provided an optical recording medium and an optical recording / reproducing apparatus, comprising: an information track having a guide groove;
It has a data recording / reproducing section, and the guide groove width of the address information section and the guide groove width of the data recording / reproducing section are different, and a dimension L1 from the guide groove width change position to the address information bit position of the address recording section is provided.
Is longer than the length corresponding to the time constant T of the reproducing amplifier.

As a result, it is possible to obtain a high-density, high-reliability optical recording medium and an optical recording / reproducing apparatus capable of reproducing address information without any erroneous detection.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS According to the first aspect of the present invention, an information track having a guide groove has an address information section in which address information is formed by uneven 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 length L1 from the guide groove width change position to the address information bit position of the address recording section is the length corresponding to the time constant T of the reproducing amplifier. The optical recording medium and the optical recording / reproducing apparatus described above have an effect that address information can be reproduced without any erroneous detection.

According to a second aspect of the present invention, the dimension L1 from the guide groove width change position to the address information bit position of the address recording section is continuously or stepwise from the inner circumference to the outer circumference of the disk. An optical recording medium and an optical recording / reproducing apparatus according to claim 1, wherein the address information can be reproduced from the inner circumference to the outer circumference without any erroneous detection when used at a constant rotation speed. It has the action of:

According to a third aspect of the present invention, an information track having a guide groove includes an address information section in which address information is formed by uneven bits, and a data recording / reproducing section. The groove width and the guide groove width of the data recording / reproducing part are different,
An optical recording medium and an optical recording / reproducing apparatus in which a 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. The reproduction can be performed without any erroneous detection.

According to a fourth aspect of the present invention, the dimension L2 from the guide groove width change position to the data recording position of the data recording / reproducing unit is continuously 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, wherein the data can be reproduced from the inner circumference to the outer circumference without any erroneous detection when used at a constant rotation speed. Has an action.

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 uneven bits, and a data recording / reproducing section. The groove width and the guide groove width of the data recording / reproducing part are different,
The dimension L1 from the guide groove width change position at the time of forward rotation to the address information bit position of the address recording unit is equal to or greater than the length corresponding to the time constant T of the reproducing amplifier, and the guide groove width change at the time of counter rotation. An optical recording medium and an optical recording / reproducing apparatus in which a 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 two heads,
If the upper surface rotates forward, the lower surface rotates reversely, and the running direction of the head with respect to the groove has an opposite relationship. In either case, the address information can be reproduced from both sides without any erroneous detection. It has the action of: When creating a disc, two discs, one for forward rotation and the other for reverse rotation, are used.
It is not necessary to create discs with different types of groove-shaped stampers and to attach them to each other up and down. It is possible to create a disc created with one stamper by attaching it to both upper and lower surfaces without using two stampers. This has the effect of reducing the production cost and simplifying the disk 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 section are continuously or stepwise from the inner circumference to the outer circumference of the disk. 6. The optical recording medium and the optical recording / reproducing apparatus according to claim 5, wherein the address information is reproduced from both sides from the inner circumference to the outer circumference without any erroneous detection when used at a constant rotation speed. 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 concave and convex bits, and a data recording / reproducing section. The groove width and the guide groove width of the data recording / reproducing part are different,
The dimension L2 from the guide groove width change position during the forward rotation to the data recording position of the data recording / reproducing unit is equal to or greater than the length corresponding to the time constant T of the reproduction amplifier, and the guide groove width change during the counter rotation is An optical recording medium and an optical recording / reproducing apparatus in which a dimension L4 from the position to the data recording position of the data recording / reproducing section is equal to or longer than the length corresponding to the time constant T of the reproducing amplifier. When used with two heads, data can be reproduced from both sides without any erroneous detection.

According to an eighth aspect of the present invention, the dimensions L2 and L4 from the guide groove width change position to the data recording position of the data recording / reproducing unit are continuously 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 7, wherein 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 one embodiment of the present invention.

In FIG. 1, 1 is a track having an address information section and a data recording / reproducing section, 2 is a guide groove, 3 is a laser beam spot by an optical head, and L1 is the address information of the address recording section from the guide groove width change position. Dimension to bit position, L2
Is the dimension from the guide groove width change 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 as a recording medium, 5 is a disk motor for rotating the optical disk 4, 6 is an optical head that outputs a laser beam to record and reproduce signals on the optical disk 4, and 7 is a reproduction detected by the optical head 6. A reproduction amplifier for amplifying the signal, 8 a binarization circuit for binarizing the reproduction signal amplified by the reproduction amplifier 7, 90 a calculation of the reproduction signal binarized by the binarization circuit 8, and output data; A signal processing circuit for generating a recording signal from input data;
A recording circuit 11 for recording the recording signal generated by the control circuit 11;

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

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

In reproducing address information during recording and reproduction, the dimension L1 from the guide groove width change position to the address information bit position of the address recording section is 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 reproduction signal waveform is eliminated. In addition, since the dimension L2 from the guide groove width change 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, after the DC fluctuation of the reproduction signal waveform is eliminated, Data can be detected at the detection threshold level. As a result, the binarization circuit accurately outputs 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 one embodiment of the present invention. In FIG. 3, 1 is a track having an address information section and a data recording / reproducing section, 2 is a guide groove, 3 is a laser beam spot by an optical head, and L1 and L3 are address information bits of the address recording section from the guide groove width change position. L2 and L4 are the dimensions from the guide groove width change position to the data recording position of the data recording / reproducing unit, and T is the time constant of the reproducing amplifier.

In FIG. 4, reference numeral 40 denotes a recording medium A,
B: an optical disk bonded to both sides, 5: a disk motor for rotating the optical disk 40, 6: an optical head for outputting a laser beam and recording / reproducing a signal on the A surface of the optical disk 40;
Reference numeral 7 denotes a reproduction amplifier for amplifying the reproduction signal detected by the optical head 6, reference numeral 8 denotes a binarization circuit for binarizing the reproduction signal amplified by the reproduction amplifier 7, and reference numeral 90 denotes reproduction binarized by the binarization circuit 8. A signal processing circuit for calculating a signal and outputting data, and generating a recording signal from the input data; 10 a recording circuit for recording the recording signal generated by the signal processing circuit 9; 11 a track control circuit; An operation related to recording / reproduction of the A side 40 is performed.

In FIG. 4, reference numeral 12 denotes an optical head for outputting a laser beam and recording / reproducing a signal on the B side of the optical disk 40, 13 a reproducing amplifier for amplifying a reproduced signal detected by the optical head 12, and 14 a reproducing amplifier. A binarization circuit for binarizing the reproduction signal amplified by 13; 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 A circuit 16 is a recording circuit for recording the recording signal generated by the signal processing circuit 15, and a track control circuit 17 performs an operation related to recording and reproduction on the B side of the optical disc 40.

As the optical disk 40 rotates, the optical head 6 advances rightward on the track, and passes through the address information section and the data recording / reproducing section alternately. At the same time, the optical head 12 advances to the left in the track and passes through the address information section and the data recording / reproducing section alternately. The operation of the optical head 6 during recording and reproduction is the same as that described in the first embodiment. In the operation of the optical head 12 during recording and reproduction, the running 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 changed.
3 corresponds to L1 in the first embodiment, and a 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,
It is the same as that shown by.

In reproducing address information during recording and reproduction, the dimensions L1 and L3 from the guide groove width change position to the address information bit position of the address recording section correspond to the time constant T of the reproduction 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 is eliminated. In addition, since the dimensions L2 and L4 from the guide groove width change position to the data recording position of the data recording / reproducing unit are lengths corresponding to the time constants T of the reproducing amplifiers 7 and 13 or more, DC fluctuation of the reproduction signal waveform is performed. After disappearing, data can be detected at the detection threshold level. As a result, the binarizing circuits 8 and 14
The address information and data recorded on the tracks on the sides B and B, respectively, 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, and L is
1, L3 are the dimensions from the guide groove width change position of the inner track 20 to the address information bit position of the address recording section;
2, L4 are the dimensions from the guide groove width change position of the inner track 20 to the data recording position of the data recording / reproducing unit 19, and L5 and L7 are the address record unit 18 from the guide groove width change position of the outer track 21. L6, L8 from the guide groove width change position of the outer track 21 to the data recording position of the data recording / reproducing unit.

In an optical disk used as a CLV system with a constant linear velocity, L1, L2, L
The dimensions of L3 and L4 may be the same values as L5, L6, L7 and L8, respectively. In a disk used as a CAV system with a constant rotation speed, the linear velocity on the outer circumference is faster than that on the inner circumference.
Therefore, in order to make each of the outer circumferences L5, L6, L7, and L8 longer than the dimension corresponding to the time constant T of the reproduction amplifier, the lengths are continuously or gradually 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 is changed between the address information section and the data recording / reproducing section, the address information is recorded during recording and the address information is reproduced during recording.
Address information and data can be reproduced without any erroneous detection, and an optical recording medium and an optical recording / reproducing apparatus with high reliability can be obtained.

According to the present invention, in an optical recording medium and an optical recording / reproducing apparatus for which high-density recording is required, even if the track width is narrowed, address information and data can be reproduced without any erroneous detection. , High reliability is obtained, and the practical effect is great. The present invention is directed to an optical recording medium and an optical recording / reproducing apparatus which are vertically adhered to each other. Can be reproduced without any erroneous detection, high reliability is obtained, and the practical effect is great.

The present invention relates to an optical recording medium and an optical recording / reproducing apparatus which are stuck up and down, and in the case of recording / reproducing with two heads, one guide groove shape is used for the traveling direction of the upper and lower optical heads. And address information and data can be reproduced without any erroneous detection. It is not necessary to prepare a stamper for the upper surface, a stamper for the lower surface, and two stampers when creating a disk.Since a single stamper can be used to create both upper and lower disks, the cost of creating a stamper can be reduced. Can be simplified, and the practical effect is great.

According to the present invention, in an optical recording medium and an optical recording / reproducing apparatus used as a CAV system with a constant rotation speed, address information and data can be reproduced from the inner periphery to the outer periphery without any erroneous detection. High reliability.
Its practical effect is great.

[Brief description of the 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 Embodiment 1 of the present invention;

FIG. 3 is a diagram showing one track of an optical recording medium according to Embodiment 2 of the present invention;

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

FIG. 5 shows a part of an optical recording medium according to Embodiment 3 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.

[Description of Signs] 1 Track having address information section and data recording / reproducing section 2 Guide groove 3 Laser beam spot by optical head L1 to L4 Dimensions

Claims (8)

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