JP3255333B2 - Optical disk drive - 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 disk recording / reproducing apparatus capable of recording, erasing, and reproducing, an optical disk reproducing apparatus, and an optical disk.

[0002]

2. Description of the Related Art In recent years, optical disk recording / reproducing apparatuses have been actively developed as large-capacity data file apparatuses and video recording / reproducing apparatuses capable of high-density recording, erasing, and reproducing.

Hereinafter, a conventional optical disk recording / reproducing apparatus will be described. FIG. 9 is a block diagram showing a conventional optical disk recording / reproducing apparatus, and FIG. 10 is a partially enlarged view showing a state where a light beam is focused on an optical disk. 9 and 10
In the figure, 1 is an optical disk having a recordable and erasable land 31 and a groove 32, 2 is a light beam, 3 is an actuator, 4 is an optical head, 5 is a land / groove switch, 6 is an inverting circuit, 7 is a focus servo control circuit. , 8 is a tracking servo control circuit, 9 is an addition circuit, 10 is a focus drive circuit, 11 is a tracking drive circuit, 21 is a variable voltage source that can change a voltage value by a value of a variable resistor or the like, and 41 is a recording signal reproducing circuit. , 71 are recording circuits, and 33 is a light spot formed by converging the light beam 2.

The operation of the optical disk recording / reproducing apparatus having the above configuration will be described below. The output of the reflected light of the optical disk 1 output from the optical head 4 is:
The signal is input to the focus servo control circuit 7 and also to the tracking servo control circuit 8 through the land / groove changeover switch 5 and the inversion circuit 6. The focus control signal detected by the focus servo control circuit 7 is added to the offset voltage from the variable voltage source 21 by the adding circuit 9 to become a focus target value, and is output to the focus drive circuit 10. The tracking servo control circuit 8 detects a land or groove tracking control signal by the land / groove changeover switch 5 and the inverting circuit 6 and outputs the signal to the tracking drive circuit 11. The focus drive circuit 10 drives the actuator 3 in a focus direction, which is a direction perpendicular to the surface of the optical disc 1, and converges the light beam 2 to form a light spot 33 on the recording surface of the optical disc 1 (FIG. 10). On the other hand, the tracking drive circuit 11 drives the actuator 3 in a tracking direction that is a radial direction of the optical disc 1 so that the light spot follows a track on the recording surface of the optical disc 1. In this state, data is generated by the recording circuit 71, and data is recorded on lands or grooves on the recording surface of the optical disc 1. The recording signal is reproduced by the recording signal reproducing circuit 41.

Here, a method of adjusting the focus position will be described. Groove 32 on the surface of optical disk 1
In the state where the servo is applied to the track, the offset voltage from the variable voltage source 21 applied to the addition circuit 9 is changed so that the average voltage of the focus control signal output by the focus servo control circuit 7 becomes 0V. As a result, the focus driving circuit 10 drives the actuator 3 in the focus direction, and moves the actuator 3 to a focus in-focus position where the amplitude level of the data recording signal and the reproduction signal on the surface of the optical disc 1 is maximized.

[0006]

However, if the focus position is adjusted while servo is applied to the track of the groove 32 as described above, the land 31 and the groove 3 are adjusted.
2, the light diffraction state is different, so that when recording and reproducing the signal of the land 31, the focus position where the amplitude level of the recording signal and the reproduction signal is maximum in the land 31 is different from the focus in-focus position in the groove 32. Come. As a result, there is a problem that the reproduction signal of the data recorded on the land 31 of the optical disc 1 is deteriorated, and the data cannot be recorded correctly at the time of recording.

[0007] The present invention, for solving the problem in the prior art to remove the influence of the deviation of the optimum focus position in the land and the groove, to provide an optical disk apparatus that can perform accurate and stable operation The purpose is to:

[0008]

Means for Solving the Problems] To achieve the above object, a first configuration of an optical disc equipment according to the present invention, the optical disc having lands and grooves, it is possible to record and reproduce data an optical disk equipment, and a recording circuit for generating a data record data on the optical disc, the recording signal reproduction circuit for reproducing a recorded signal recorded on the optical disc, the light reflected is radiated to the optical disk It detects a focus control circuit for controlling the converging state of the light beam irradiated on the optical disk, and a controller for controlling the focus control circuit receives a reproduced signal outputted from the recording signal reproducing circuit, 2 a reproduction signal
A binarization circuit for binarization and recording of binarized data
Compares with the previous original data, detects the error rate, and
And a error rate detection circuit which outputs the controller, when data recorded on, depending on the output of the error rate detection circuit
Target of focus control circuit in land and groove
The focus position is changed between the land and the groove while controlling to set the position.

[0009]

Further, the second optical disc equipment according to the present invention
Is an optical disc device capable of reproducing data from an optical disc having lands and grooves, comprising: a recording signal reproducing circuit for reproducing a recording signal recorded on the optical disc; A focus control circuit that detects reflected light and controls a convergence state of a light beam applied to the optical disc; a controller that receives the reproduction signal output from the recording signal reproduction circuit and controls the focus control circuit ; Signal
A binarizing circuit for binarizing, and recording the binarized data
Collation with the original data before
And an error rate detection circuit for outputting to the controller .
During data reproduction, the output of the error rate detection circuit is used.
What is the focus control circuit eye on land and groove
The focus position is changed between the land and the groove while controlling to set the target position .

[0011]

[0012]

[0013]

[0014]

[0015]

[0016]

[0017]

[0018]

According to the first configuration of the optical disc equipment of the present invention, since the changing focus position at the land and the groove at the time of data recording, the optimum position of the separately focus the land and the groove at the time of data recording Can be adjusted. As a result, it is possible to remove the influence of the deviation of the optimum focus position between the land and the groove,
The quality of the recording signal at the time of recording each of the land and the groove can be improved, and errors at the time of data recording can be reduced. Also, the error rate of the reproduced data makes it easy
Optimum focus position separately for land and groove
Adjustment for optimum land and groove
The influence of the displacement of the focus position can be eliminated. That
As a result, the quality of the reproduction signal of each land and groove
Recording and playback of data by improving the quality of the recording signal during recording
Errors in time can be reduced.

[0019]

Further, the second optical disc equipment of the present invention
According to the configuration, the focus position is changed between the land and the groove at the time of data reproduction, so that the focus can be adjusted to the optimum position separately at the land and the groove at the time of data reproduction. As a result, the influence of the shift of the optimum focus position between the land and the groove can be eliminated, so that the quality of the reproduction signal of each of the land and the groove can be improved, and errors in data reproduction can be reduced. Also, it is easy to run at the error rate of the reproduced data.
Adjust the optimal focus position separately for the
Optimal focus on land and groove
This can eliminate the influence of the displacement of the position. The result
As a result, the quality of the reproduction signal of each land and groove, and recording
The recording signal quality when recording and reproducing data.
Can be reduced.

[0021]

[0022]

[0023]

[0024]

[0025]

[0026]

[0027]

EXAMPLES Hereinafter, the present invention will be described more specifically with reference to examples. (Embodiment 1) FIG. 1 is a block diagram showing an embodiment of an optical disk recording / reproducing apparatus according to the present invention, and FIG. 2 is a schematic view of an optical disk according to the present invention. 1 and 2, reference numeral 51 denotes an optical disk having areas A and B in which a single-frequency signal is written on a recordable and erasable land and groove, 2 denotes a light beam, 3 denotes an actuator, 4 denotes an optical head, and 5 denotes a land. A groove changeover switch, 6 is an inversion circuit, 7 is a focus servo control circuit, 8 is a tracking servo control circuit, 9 is an addition circuit, 10 is a focus drive circuit, 11
Is a tracking drive circuit, 41 is a recording signal reproducing circuit, 4
2 is a level detection circuit, 43 is a controller, and 71 is a recording circuit.

The operation of the optical disk recording / reproducing apparatus having the above-described configuration during reproduction will be described below. The light output from the optical head 4 and radiated and reflected on the optical disk 51 is input to the focus servo control circuit 7 and the land / groove switch 5
Is also input to the tracking servo control circuit 8 through the inversion circuit 6. The focus control signal detected by the focus servo control circuit 7 is added to the controller 4 by the addition circuit 9.
The offset voltage from 3 is added to the focus target value, which is output to the focus drive circuit 10. The tracking servo control circuit 8 detects a land or groove tracking control signal by the land / groove changeover switch 5 and the inverting circuit 6 and outputs the signal to the tracking drive circuit 11. The focus drive circuit 10 drives the actuator 3 in a focus direction, which is a direction perpendicular to the surface of the optical disk 51, and converges the light beam 2 to form a light spot on the recording surface of the optical disk 51. On the other hand, the tracking drive circuit 11 drives the actuator 3 in the tracking direction, which is the radial direction of the optical disk 51, and causes the light spot to follow a land or groove track on the recording surface of the optical disk 51.

Here, a method of adjusting the focus position will be described focusing on the block A shown by a broken line in FIG. Before the servo is applied, the controller 43 outputs to the adding circuit 9 an offset voltage to which a certain degree of focus is applied. Then, with the servo applied to the land or groove of the optical disk 51 selected by the land / groove changeover switch 5, the signal in the area A where the single frequency repetitive signal is written is reproduced by the recording signal reproducing circuit 41, Output to the detection circuit 42. In this case, since the single-frequency repetition signal written in the area A has a large change in signal amplitude due to the shift of the focus position, the single-frequency repetition signal having the shortest mark length determined by the modulation rule used is used. I have. The level detection circuit 42 calculates the amplitude level of the written single-frequency repetitive signal, and outputs the result to the controller 43. After applying the servo, the controller 43 first changes the offset voltage applied to the adding circuit 9 and stores the output result of the signal amplitude level of a single frequency by the respective offset voltages of the level detecting circuit 42. Then, to determine the offset voltage V _1, V ₂ of signal amplitude level of a single frequency, as shown in FIG. 3 becomes -3 dB, the signal amplitude level of a single frequency of the offset voltage V _1, V ₂ which maximizes Central value V _c : (V ₁ + V ₂ ) / 2
Is added to the addition circuit 9, the actuator 3 can be adjusted to the optimum focus position. Therefore, using the above method, the offset voltage corresponding to the optimum focus position at the time of reproduction on the lands and grooves of the optical disk 51 is obtained and stored. Then, the data is reproduced by the recording / reproducing signal circuit 41 by applying the offset voltage corresponding to the land and the groove to the adding circuit 9 at the time of reproducing the data. Further, the offset voltage corresponding to the optimum focus position of the land and the groove at the time of the reproduction is stored, and this offset voltage is applied to the adding circuit 9 at the time of data recording, whereby the recording circuit 71
To generate data and record the data.

According to the above configuration, the actuator 3 can be adjusted to the optimum focus position separately for the land and the groove, so that the influence of the shift of the optimum focus position between the land and the groove can be eliminated. As a result, the quality of the reproduction signal of each land and groove and the quality of the recording signal at the time of recording can be improved, and errors at the time of data recording and reproduction can be reduced.

Also, in the area B provided in the center of the optical disc 51, if the focus position is optimized and the inner side of the area B is recorded and reproduced with the focus position, the same Since the shift of the focus position due to the influence of the difference in the inclination and the uneven thickness on the inner and outer circumferences of the optical disk can be corrected, the signal quality in the disk can be further improved.

In the first embodiment, the recording circuit 71
Although the description has been given of the case of the optical disk recording / reproducing apparatus provided with the optical disk, the actuator 3 is adjusted to the optimum focus position in each of the land and the groove by using the same method in the case of the optical disk reproducing apparatus from which the recording circuit 71 is removed. Can be.

In the first embodiment, a method of adding an offset voltage to the focus control signal is employed as a means for shifting the focus target value. However, the present invention is not necessarily limited to this configuration. Alternatively, the adder circuit 9 may be removed from the above configuration, and the focus target value may be shifted by the output of the balance controller of the differential amplifier that outputs the focus control signal in the focus servo control circuit 7.

In the first embodiment, the case where the signal amplitude level of a single frequency of the offset voltages V ₁ and V ₂ output from the controller 43 is -3 dB has been described as an example. is not limited to the value, if the value of V _c can be calculated, for example, -1
It may be dB or -6 dB.

(Embodiment 2) FIG. 4 is a block diagram showing another embodiment of the optical disk recording / reproducing apparatus according to the present invention.
The same parts as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted. In FIG. 4, 52 is an optical disk having lands and grooves that can be recorded and erased, 41 is a recording signal reproducing device, 43 is a controller, 61 is a binarization circuit for binarizing a reproduction signal, 62 is an error rate detection circuit,
71 is a recording circuit.

Hereinafter, an optical disk recording / reproducing apparatus having the above-described configuration will be described with reference to a block B shown by a broken line in FIG.
The operation will be described mainly with reference to FIG. Before the servo is applied, the controller 43 outputs to the adding circuit 9 an offset voltage to which a certain degree of focus is applied. Then, while the servo is applied to the land or groove of the optical disk 52 selected by the land / groove changeover switch 5, data is generated by the recording circuit 71 on the optical disk 52 and a random signal is written. The data is reproduced at 41 and output to the binarization circuit 61. The binarization circuit 61 binarizes the written random signal by level slicing at a predetermined level, and outputs the binarized data to the error rate detection circuit 62. The error rate detection circuit 62 compares the original data of the recorded random signal with the data output from the binarization circuit 61, calculates an error rate, and outputs the result to the controller 43. After applying the servo, the controller 43 first changes the offset voltage applied to the addition circuit 9 and stores the output result of the error rate of the random signal by the respective offset voltages of the error rate detection circuit 62. Then, to determine the offset voltage V _3, V ₄ of the controller 43 the value of the error rate of the random signal as shown in FIG. 5 is ^10-4, the center of the offset voltage V _3, V ₄ the error rate is minimum The value V _E: (V ₃
By adding + V ₄ ) / 2 to the addition circuit 9, the focus can be adjusted to the optimum position. Therefore, using the above method, an offset voltage corresponding to the optimum focus position at the time of reproduction on the lands and grooves of the optical disk 52 is obtained and stored, and the offset voltage corresponding to the lands and grooves is applied to the adder circuit 9 at the time of data reproduction. Thus, data is reproduced by the recording / reproducing signal circuit 41. Further, an offset voltage corresponding to the optimum focus position of the land and the groove at the time of reproduction is stored, and the recording circuit 71 generates data by applying the offset voltage to the addition circuit 9 at the time of recording. Record.

According to the above configuration, since the actuator 3 can be adjusted to the optimum focus position separately for the land and the groove, it is possible to eliminate the influence of the shift of the optimum focus position between the land and the groove.
As a result, it is possible to improve the quality of the reproduction signal of each land and groove and the quality of the recording signal at the time of recording, and reduce errors at the time of data recording and reproduction.

In the second embodiment, the recording circuit 71
Although the description has been given of the case of the optical disc recording / reproducing apparatus provided with the above, even in the case of the optical disc reproducing apparatus from which the recording circuit 71 is removed, it is possible to adjust the actuator 3 to the optimum focus position in each of the land and the groove by using the same method. it can.

In the second embodiment, a method of adding an offset voltage to the focus control signal is used as a means for shifting the focus target value. However, the present invention is not limited to this configuration. Alternatively, the adder circuit 9 may be removed from the above configuration, and the focus target value may be shifted by the output of the balance controller of the differential amplifier that outputs the focus control signal in the focus servo control circuit 7.

In the second embodiment, the case where the error rate value of the random signal of the offset voltages V ₃ and V ₄ output from the controller 43 is 10 ⁻⁴ has been described as an example, but it is not necessarily required. is not limited to this value, as long as the value of V _E can be calculated, for example, 1
It may be 0 ^-3 or 10 ^-2 .

(Embodiment 3) FIG. 6 is a block diagram showing an embodiment of an optical disk reproducing apparatus according to the present invention, and FIG. 7 is a schematic diagram of an optical disk according to the present invention. 6 and 7, reference numeral 53 denotes a read-only optical disk or a recordable and erasable optical disk having areas C and D in which a signal of a single frequency is written in lands and grooves, 2 denotes a light beam, 3 denotes an actuator, and 4 denotes an optical head. , 7 is a focus servo control circuit, 8 is a tracking servo control circuit, 9 is an addition circuit,
10 is a focus drive circuit, 11 is a tracking drive circuit, 41 is a recording signal reproduction circuit, 42 is a level detection circuit,
43 is a controller.

Hereinafter, the operation of the optical disk reproducing apparatus having the above configuration will be described. The light output from the optical head 4 and applied to the optical disk 53 and reflected is input to the focus servo control circuit 7 and the tracking servo control circuit 8. The focus control signal detected by the focus servo control circuit 7 is added with an offset voltage from the controller 43 by the addition circuit 9 to become a focus target value, and is output to the focus drive circuit 10. The tracking servo control circuit 8 detects the tracking control signal and outputs it to the tracking drive circuit 11. The focus drive circuit 10 drives the actuator 3 in a focus direction, which is a direction perpendicular to the recording surface of the optical disc 53, and converges the light beam 2 to
To form a light spot on the recording surface. On the other hand, the tracking drive circuit 11 drives the actuator 3 in the tracking direction, which is the radial direction of the optical disc 53, so that the light spot follows the track on the recording surface of the optical disc 53.

Here, a method of adjusting the focus position when the optical disk 53 is a read-only optical disk will be described focusing on the block D indicated by a broken line in FIG.

Before the servo is applied, the controller 43 outputs to the adder circuit 9 an offset voltage to which a certain degree of focus is applied. With the servo applied, the signal in the area C in which the single frequency repetitive signal is written is reproduced by the recording signal reproducing circuit 41 and output to the level detecting circuit 42. In this case, the single-frequency repetition signal written in the area C has a large signal amplitude change due to the shift of the focus position, and is therefore a single-frequency signal having the shortest mark length determined by the modulation rule used. The level detection circuit 42 calculates the amplitude level of the written single-frequency repetitive signal, and outputs the result to the controller 43.
Output to After applying the servo, the controller 43 first changes the offset voltage applied to the adding circuit 9 and stores the output result of the signal amplitude level of a single frequency by the respective offset voltages of the level detecting circuit 42. Next, the signal amplitude level of a single frequency as shown in FIG.
The offset voltage V _{1 of} the controller 43, which is 3 dB,
Determining the V _2, the center value V _c of the offset voltages V ₁ and V ₂ of signal amplitude level of a single frequency is maximized: (V ₁ + V
By adding ₂ ) / 2 to the adder circuit 9, the focus can be adjusted to the optimum position. Therefore, by using the above method, the offset voltage value corresponding to the optimum focus position when the optical disk 53 is a read-only optical disk can be obtained and stored.

Even when the optical disk 53 is a recordable / erasable optical disk, the offset of the controller 43 corresponding to the optimum focus position with respect to the recordable / erasable optical disk is determined in the same manner as in the case of the read-only optical disk. The voltage value can be obtained.

As described above, whether the optical disk 53 is a read-only optical disk or a recordable / erasable optical disk, the offset voltage value stored by the controller 43 is added to the adder circuit 9 in accordance with each disk. Thus, the signal can be reproduced at the optimum focus position according to each disc. As a result, the influence of the shift of the optimum focus position between different optical disks can be removed, so that the quality of the reproduced signal can be improved.

Also, in the area D provided in the middle part of the optical disc 53, the focus position is optimized in the same manner as described above, and the recording / reproduction on the inner periphery side of the area D with the focus position is continued. In addition, since the deviation of the focus position due to the influence of the difference in the inclination between the inner and outer circumferences of the same optical disc and the uneven thickness can be corrected, the signal quality in the disc can be further improved.

In the third embodiment, the description has been given of the case of the optical disk reproducing apparatus for reproduction only. However, even in the case of the optical disk recording / reproducing apparatus having the same structure as the reproducing portion and having the recording circuit, By using a similar method, a signal can be reproduced at the optimum focus position.

Further, in the third embodiment, as a means for shifting the focus target value, a method of adding an offset voltage to the focus control signal is employed. However, the present invention is not necessarily limited to this configuration. Alternatively, the adder circuit 9 may be removed from the above configuration, and the focus target value may be shifted by the output of the balance controller of the differential amplifier that outputs the focus control signal in the focus servo control circuit 7.

In the third embodiment, the case where the signal amplitude level of a single frequency of the offset voltages V ₁ and V ₂ output from the controller 43 is -3 dB has been described as an example. The signal amplitude level of a single frequency of V ₁ and V ₂ is not limited to a value, and may be any value as long as the value of V _c can be calculated. For example, the signal amplitude level may be −1 dB or −6 dB.

(Embodiment 4) FIG. 8 is a block diagram showing another embodiment of the optical disk reproducing apparatus according to the present invention. still,
The same parts as those in the third embodiment are denoted by the same reference numerals, and description thereof will be omitted. 8, reference numeral 54 denotes a read-only optical disk or a recordable / erasable optical disk; 41, a recording signal reproducing device; 43, a controller; 61, a binarization circuit for binarizing a reproduction signal; and 62, an error rate detection circuit.

Hereinafter, a method of adjusting the focus position of the optical disk reproducing apparatus having the above-described configuration when the optical disk 53 is a read-only optical disk will be described with a focus on the block E shown by a broken line in FIG. . Before the servo is applied, the controller 43 outputs to the adding circuit 9 an offset voltage to which a certain degree of focus is applied. Then, with the servo applied to the optical disk 54, the random signal of the optical disk 54 is reproduced by the recording signal reproduction circuit 41 and output to the binarization circuit 61.
The binarizing circuit 61 binarizes the written random signal by level-slicing it at a predetermined level.
The value data is output to the error rate detection circuit 62. The error rate detection circuit 62 compares the original data of the recorded random signal with the data output from the binarization circuit 61, calculates an error rate, and outputs the result to the controller 43. After applying servo, controller 4
Reference numeral 3 first changes the offset voltage applied to the addition circuit 9 and stores the output result of the error rate of the random signal by the respective offset voltages of the error rate detection circuit 62. Then, to determine the offset voltage V _3, V ₄ of the controller 43 the value of the error rate of the random signal as shown in FIG. 5 is ^10-4, the center of the offset voltage V _3, V ₄ the error rate is minimum The value V _E: (V ₃ + V
₄ ) By adding / 2 to the addition circuit 9, the focus can be adjusted to the optimum position. Therefore, by using the above method, the offset voltage value of the controller 43 corresponding to the optimum focus position when the optical disk 54 is a read-only optical disk can be obtained and stored.

Even when the optical disk 54 is a recordable / erasable optical disk, the offset of the controller 43 corresponding to the optimum focus position for the recordable / erasable optical disk is determined in the same manner as in the case of the read-only optical disk. The voltage value can be determined and the value can be stored.

As described above, whether the optical disk 54 is a read-only optical disk or a recordable / erasable optical disk, the offset voltage value stored by the controller 43 is added to the adder circuit 9 in accordance with each disk. Thus, it is possible to reproduce a signal at an optimum focus position corresponding to each disc. As a result, the influence of the shift of the optimum focus position between different optical disks can be removed, so that the quality of the reproduced signal can be improved.

In the fourth embodiment, the description has been given of the case of the optical disk reproducing apparatus for reproduction only. However, even in the case of the optical disk recording / reproducing apparatus having the same configuration as the reproducing portion and having the recording circuit, By using a similar method, a signal can be reproduced at the optimum focus position.

In the fourth embodiment, a method of adding an offset voltage to the focus control signal is employed as a means for shifting the focus target value. However, the present invention is not necessarily limited to this configuration. Alternatively, the adder circuit 9 may be removed from the above configuration, and the focus target value may be shifted by the output of the balance controller of the differential amplifier that outputs the focus control signal in the focus servo control circuit 7.

In the fourth embodiment, the case where the error rate value of the random signals of the offset voltages V ₃ and V ₄ output from the controller 43 is 10 ⁻⁴ has been described as an example, but it is not necessarily required. this value is not limited, the value of the error rate of V _3, V ₄ is as long as it can be calculated the value of V _E, for example, may be a 10 ^-3 and 10 ^-2.

[0058]

As described in the foregoing, according to the first configuration of an optical de <br/> office click equipment according to the present invention, since the changing focus position at the land and the groove at the time of data recording During data recording, the land and the groove can be separately adjusted to the optimum focus position. As a result, the influence of the shift of the optimum focus position between the land and the groove can be removed, so that the quality of the recording signal at the time of recording each of the land and the groove can be improved, and errors at the time of data recording can be reduced. . Also played
Easy separation between land and groove with error rate of data
The optimal focus position can be adjusted
Of deviation of optimal focus position between groove and groove
Can be removed. As a result, land and groove
The quality of each playback signal and the quality of the recording signal during recording
Good to reduce errors during data recording and playback
can do.

[0059]

[0060] The second optical disc equipment according to the present invention
According to the configuration, the focus position is changed between the land and the groove at the time of data reproduction, so that the focus can be adjusted to the optimum position separately at the land and the groove at the time of data reproduction. As a result, the influence of the shift of the optimum focus position between the land and the groove can be eliminated, so that the quality of the reproduction signal of each of the land and the groove can be improved, and errors in data reproduction can be reduced. Also, it is easy to run at the error rate of the reproduced data.
Adjust the optimal focus position separately for the
Optimal focus on land and groove
This can eliminate the influence of the displacement of the position. The result
As a result, the quality of the reproduction signal of each land and groove, and recording
The recording signal quality when recording and reproducing data.
Can be reduced.

According to the second configuration of the optical disk recording / reproducing apparatus of the present invention or the second configuration of the optical disk reproducing apparatus of the present invention, the focus position can be set between the recordable optical disc and the read-only optical disc during data reproduction. Since it is changed, the focus can be adjusted to the optimum position separately for the recordable optical disc and the read-only optical disc. As a result, it is possible to remove the influence of the shift of the optimum focus position between different optical disks,
The quality of the reproduced signal can be improved.

Further, according to the configuration of the optical disk of the present invention, since the optical disk has an area in which a signal of a single frequency is written in the land and the groove, the offset at which the signal amplitude level of the single frequency becomes a predetermined value is obtained. The voltages V ₁ and V ₂ are determined, and the center value V _{C of the} offset voltages V ₁ and V ₂ at which the signal amplitude level of a single frequency is maximized: (V ₁ + V ₂ ) /
By adding 2 to the addition circuit, it is possible to easily adjust the focus to the optimum position.

[Brief description of the drawings]

FIG. 1 is a block diagram showing one embodiment of an optical disk recording / reproducing apparatus according to the present invention.

FIG. 2 is a schematic view of an optical disc according to the present invention.

FIG. 3 is a characteristic diagram of a controller of the optical disc recording / reproducing apparatus according to the present invention.

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

FIG. 5 is a characteristic diagram of a controller of the optical disc recording / reproducing apparatus according to the present invention.

FIG. 6 is a block diagram showing one embodiment of an optical disk reproducing apparatus according to the present invention.

FIG. 7 is a schematic diagram of an optical disc according to the present invention.

FIG. 8 is a block diagram showing another embodiment of the optical disc reproducing apparatus according to the present invention.

FIG. 9 is a block diagram illustrating an optical disk recording / reproducing apparatus according to the related art.

FIG. 10 is a partially enlarged view showing a state in which a light beam is focused on an optical disk in a conventional optical disk recording / reproducing apparatus.

[Explanation of symbols]

 41 Recording Signal Reproduction Circuit 42 Level Detection Circuit 43 Controller 51, 52, 53, 54 Optical Disk 61 Binarization Circuit 62 Error Rate Detection Circuit 71 Recording Circuit

────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shinichi Konishi 1006 Kazuma Kadoma, Osaka Pref. Matsushita Electric Industrial Co., Ltd. (56) References JP-A-7-287855 (JP, A) JP-A-7 JP-A-320285 (JP, A) JP-A-7-129975 (JP, A) JP-A-8-7282 (JP, A) JP-A-6-150334 (JP, A) JP-A-3-165332 (JP, A) JP-A-5-159318 (JP, A) JP-A-61-211842 (JP, A) JP-A-6-187733 (JP, A) JP-A-61-177646 (JP, A) 242480 (JP, A) JP-A-5-347045 (JP, A) JP-A-57-50330 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) G11B ^7/ 00-7 / 013 G11B 7/09-7/10

Claims (2)

(57) [Claims] An optical disc capable of recording and reproducing data on an optical disc having lands and grooves.
A click equipment, a recording circuit for generating a data record data on the optical disc, the recording signal reproduction circuit for reproducing a recorded signal recorded on the optical disc, the light reflected is radiated to the optical disc detection and binarizing the focus control circuit for controlling the converging state of the light beam to be irradiated, and a controller for controlling the focus control circuit receives a reproduced signal outputted from the recording signal reproducing circuit, a reproduced signal on the optical disc And a binarization circuit
The recorded data against the original data before recording, and
Error rate detection that detects
Output circuit, and detects the error rate during data recording.
Output in the land and groove
While controlling to set the target position of the waste control circuit,
Et al., Optical disc equipment which is adapted change the focus position in the land and the groove. 2. An optical disk having lands and grooves.
Optical disc device that can reproduce data
A recording signal recorded on the optical disc.
A recording signal reproducing circuit to be generated,
Light reflected on the optical disk
A focus control circuit for controlling the convergence state of the
Receiving the reproduced signal output from the recording signal reproducing circuit,
A controller that controls the focus control circuit and a playback signal
A binarizing circuit for binarizing a signal and a binarized data.
Check the original data before recording to detect the error rate.
And an error rate detection circuit that outputs to the controller
When reproducing data , the output of the error rate detection circuit
Focus control circuit in land and groove
While controlling so as to set the target position, the light disk which is adapted change the focus position in the land and the groove
Equipment.