JP2001266370A - Method and device for recording and reproducing in optical recording medium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve a problem that it takes time to retrieve recorded information since reading of an address becomes unstable and that the reproducing quality of the recorded information is deteriorated, when a focusing position optimal to a data part is set at the time of reproduction. SOLUTION: An address part or a data part has a focus means for focusing laser beams and this focusing means operates to set focus optimum value respectively independently to the cases of reproducing the address part and reproducing a data part in this recording and reproducing device for an optical recording medium. In the case of retrieving a position where the information is recorded, the device makes the focus means operate to set the focusing position where the address part can be read best.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for recording / reproducing an optical recording medium having a thin film of material formed on a substrate and irradiating a high energy beam such as a laser beam onto the optical recording medium. The present invention relates to a method capable of reading information recorded in a medium and reproducing the information with less errors.

[0002]

2. Description of the Related Art In recent years, an optical recording medium capable of recording, reproducing, and erasing information and an optical recording apparatus for recording and reproducing this optical recording medium have been commercialized. Further, research and development of a high-density rewritable optical recording medium and an optical recording device capable of recording and reproducing a high-quality moving image have been actively performed.

As a rewritable optical recording medium, for example, a chalcogenide thin film such as Ge-Sb-Te or In-Sb-Te is provided on a substrate having a disk shape and provided with uneven tracks and address pits. Phase change optical recording media are known. Further, a magneto-optical recording medium including a thin metal film such as Fe-Tb-Co as a recording layer is known. The address pits are provided with position information on the optical recording medium, and the optical recording / reproducing apparatus performs a search operation while reproducing the position information. In a phase change optical recording medium, for example,
The recording thin film layer made of the phase change material is irradiated with a focused laser beam, and the irradiated portion is locally heated to a predetermined temperature. The irradiated portion is converted to a crystalline state when the ultimate temperature is equal to or higher than the crystallization temperature, and is converted to an amorphous state when rapidly cooled after melting beyond the melting point. Either the amorphous state or the crystalline state is defined as a recorded state or an erased state (unrecorded state), and recording is performed by forming an amorphous mark in a pattern corresponding to an information signal. These state changes are reversible, and recording or erasing of information is repeatedly performed. Optical characteristics are different between the crystalline state and the amorphous state, and a signal can be reproduced by optically detecting a change in reflectance or a change in transmittance using the difference in the characteristics.

In a magneto-optical recording medium, for example, a laser beam focused on a magneto-optical recording thin film is irradiated and locally heated to a predetermined temperature. By applying a magnetic field simultaneously with the heating and inverting the magnetization direction of the magneto-optical recording thin film according to the information, the recording or rewriting of the information is repeatedly performed.

Hereinafter, a conventional recording / reproducing method for an optical recording medium for performing high-density recording / reproducing will be described. When the optical recording medium is mounted on the recording / reproducing apparatus, the rotation of the optical recording medium starts. Thereafter, the optical recording apparatus sets the laser power to the reproducing power, and sets the focus condition and the tracking condition for reproducing the information by the laser beam to a constant servo value for scanning the track. Next, the address signal is reproduced to move to a target track position. In order to record information with an optimum laser power on an optical recording medium, power learning is performed to increase or decrease the power of a semiconductor laser and extract an optimum writing power. As described above, when a series of operations is completed, the optical recording / reproducing apparatus can perform recording / reproducing on the optical recording medium.

[0006]

However, a signal is reproduced with an optimum value of a focus condition of an address portion for reproducing a signal using diffraction of light due to unevenness and a reflectance difference based on an amorphous / crystalline state difference. The optimum value of the focus condition in the data section may be different. In this case, if an optimal focus condition is set for the data portion during reproduction, the reading of the address becomes unstable, and it sometimes takes time to search recorded information. Conversely, when an optimal focus position is set in the address portion, there is a problem that the reproduction quality of recorded information is deteriorated.

Accordingly, an object of the present invention is to solve the above-mentioned problems and to enable a stable signal recording / reproducing operation for both an address section and a data section.

[0008]

An apparatus for recording / reproducing information on an optical recording medium capable of optically recording / reproducing, comprising: a first focus condition for reproducing an address portion on the optical recording medium; A second focus condition for reproducing the unit is provided, and the first focus condition and the second focus condition are switched and set according to the operation mode of the recording / reproducing device.

In this case, the signal can be stably reproduced when the address portion needs to be reproduced stably and when the data portion needs to be reproduced with improved signal quality. Further, the apparatus has a focus condition corresponding to the recording of the data section. In this case, stable data recording becomes possible.

Further, when searching for a position on the optical recording medium, the first focus condition is set, and when reproducing a data portion on the optical recording medium, the second focus condition is set. The device configuration is as follows. In this case, the address can be reproduced stably at the time of retrieval, and the reproduction signal quality of the data portion can be improved.

Alternatively, there is provided an apparatus for recording / reproducing information on an optically recordable optical recording medium, comprising a focusing means for focusing a laser beam on an address section or a data section provided on the optical recording medium; The apparatus is configured by an address section focus learning section for extracting a focus condition corresponding to reproduction of an address section by the focus section, and a data section focus learning section for extracting a focus condition corresponding to reproduction of the data section by the focus section. .

In this case, the optimum focus condition for address reproduction and the optimum focus condition for data reproduction can be independently extracted. Further, the apparatus may be provided with a recording focus learning means for extracting a focus condition corresponding to data recording. In this case, it is possible to independently extract the optimum focus condition at the time of recording. Also,
The apparatus may be provided with a search focus learning unit for extracting a focus condition at the time of search. In this case, the operation at the time of retrieval can be stabilized.

Further, there is provided an apparatus for recording / reproducing information on / from an optical recording medium having optically recordable concave / convex grooves,
Focusing means for focusing laser light on an address portion or data portion provided on the optical recording medium; and concave address focus learning means for extracting focus conditions for reproducing the address portion when the laser light scans the concave portion of the groove. A convex address focus learning means for extracting a focus condition for reproducing an address portion when the laser beam scans the convex portion of the groove; and reproducing a data portion when the laser beam scans a concave portion of the groove. The device configuration is composed of concave data focus learning means for extracting a focus state and convex data focus learning means for extracting a focus condition for reproducing a data part when a laser beam scans a convex part of the groove.

In this case, when the laser beam scans the concave portion of the groove and when the laser beam scans the concave portion of the groove, it is possible to respectively extract the optimum focus position for address reproduction and the optimum focus position for data reproduction. it can.
Further, the apparatus is configured to include a search focus learning unit for extracting a focus condition at the time of search.

Further, there is provided a method for recording and reproducing information on an optically recordable optical recording medium, comprising: a focusing step of converging a laser beam on an address portion or a data portion provided on the optical recording medium; The recording / reproducing method for an optical recording medium includes an address part focus learning step of extracting a focus condition corresponding to reproduction of a part and a data part focus learning step of extracting a focus condition corresponding to reproduction of a data part.

Further, a recording / reproducing method is provided in which a correlation between focus conditions is obtained and determined in each of the learning steps.
In this case, if one focus condition is extracted, the extraction of the other focus condition can be omitted.

Further, a recording / reproducing method for recording a learning result of each focus condition on an optical recording medium is adopted. in this case,
Next, the step of extracting the focus condition when the optical recording medium is mounted on the recording / reproducing apparatus can be omitted.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An optical recording medium recording / reproducing apparatus according to the present invention will be described below with reference to the drawings.

(Embodiment 1) FIG. 1 is a block diagram schematically showing an optical recording / reproducing apparatus which operates according to a method for recording / reproducing an optical recording medium according to the present embodiment. The optical recording / reproducing apparatus 1 includes a focus servo circuit 3 for converging a laser beam 12 emitted from an optical head 2 equipped with a laser on a data portion or an address portion of the optical recording medium 9, and a laser beam 12 on the optical recording medium. 9, a transfer servo circuit 17 for retrieving a target position, a laser drive circuit 5 for irradiating a laser according to a predetermined emission power and recording data, and a reproduction circuit for demodulating light reflected from the optical recording medium 9 into an information signal. 6. A controller 7 for controlling a series of operations of each of the above circuits. The optical head 2 is connected to a transport mechanism 19 and is movable in the longitudinal direction of the optical recording medium 9.

The focus servo circuit 3 includes an address focus setting unit 13 and a data reproduction focus setting unit 1.
4, a recording focus setting unit 15, and a focus position setting circuit 16 are connected via an operation mode changeover switch 18. The optical recording / reproducing apparatus 1 is connected to a host computer 8 via a controller 7.

The procedure for learning the focus position in the optical recording apparatus 1 will be described with reference to the flowchart of FIG. In the optical recording medium mounting step 201, when the optical recording medium 9 is inserted into the optical recording apparatus 1 and mounted on the clamp 10, the controller 7 outputs a start command to the spindle motor 11, and the rotation of the optical recording medium 9 starts. Reproduction light power setting step 202
The laser drive circuit 5 enters the reproduction mode and sets the irradiation intensity of the laser beam 12 to the reproduction power. In the test area seek step 203, the optical head 2 is transferred to the test area of the optical recording medium 9 by the transfer servo circuit 17, focused by the focus servo circuit 3, and is tracked by the tracking servo circuit 4.

First, in order to obtain the focus position of the address portion, the focus position changing step 204 changes the focus offset value by the focus servo circuit 3 continuously or stepwise to change the focus state of the condensed spot. Change. Address reproduction step 205
Is to continuously reproduce the address portion while changing the focus offset, and measure, for example, jitter as the address reproduction quality.

In decision 206, for example, as shown in FIG. 3, a focus offset value at which the address jitter becomes 13% is obtained. That is, the focus offset value Fa1 in the direction away from the optical recording medium and the focus offset value Fa2 in the direction approaching the optical recording medium are obtained. This, F
Steps 204 and 205 until a1 and Fa2 are obtained.
And 206 are repeated. In the address reproduction focus value setting step 207, an intermediate value Fa, for example, (Fa1 + Fa2) / 2 is obtained from Fa1 and Fa2, and the controller 7 causes the address focus setting unit 13 to store Fa.

Next, in order to determine the focus position of the data portion, in a focus position changing step 208, the focus servo circuit 3 changes the focus offset value continuously or stepwise. The data reproduction step 209 measures, for example, jitter as the reproduction quality of the data portion.

In decision 210, for example, as shown in FIG. 3, a focus offset value at which the jitter becomes 13% is obtained. That is, a focus offset value Fr1 in a direction away from the optical recording medium and a focus offset value Fr2 in a direction approaching the optical recording medium are obtained. This Fr1 and F
Steps 208, 209, and 21 until r2 is determined.
Repeat 0. Data part reproduction focus value setting step 21
1 obtains Fr, which is an intermediate value between Fr1 and Fr2, for example, (Fr1 + Fr2) / 2, and causes the controller 7 to store the Fr in the data reproduction focus setting unit 14 by the controller 7.

Further, in order to determine the focus position of the recording film, in a focus initial value changing step 212, the focus servo circuit 3 changes the focus offset value continuously or stepwise. In the data part recording step 213, the laser drive circuit 5 is set to the recording mode, and the modulated light is applied to the optical recording medium 9 to record data. Next, the data section reproducing step 214 is performed in step 213.
For example, the jitter is measured as the reproduction quality of the data portion recorded in step (1).

In the determination 215, for example, as shown in FIG. 3, a focus offset value at which the data jitter is 13% is obtained. That is, the focus offset value Fw1 in the direction away from the optical recording medium and the focus offset value Fw2 in the direction approaching the optical recording medium are obtained. This, Fw
Steps 212, 213, and 214 are repeated until 1 and Fw2 are obtained. In the data portion reproduction focus value setting step 211, Fw1 and Fw2 are used as intermediate values of Fw1 and Fw2.
w, for example, (Fw1 + Fw2) / 2 is obtained, and the recording focus setting unit 15 stores Fw.

After the learning of the three focus positions Fa, Fr, and Fw is completed, the optical recording / reproducing apparatus 1 enters a recording / reproducing standby state 217, and the optical recording / reproducing apparatus 1 performs address reproduction or data reproduction on the optical recording medium 9. Can be reproduced, added, and rewritten.

As described above, according to the procedure shown in FIG. 2, when the optical recording medium 9 is mounted on the optical recording / reproducing apparatus 1, the focus offset value at the time of address reproduction, the focus offset value at the time of data portion reproduction, and the recording Are independently learned and set. That is, it is possible to set an optimum focus offset value when reproducing with priority on the address, when reproducing with priority on the data portion, or when giving priority to recording.

Although only the focus offset has been described here as the focus condition, a stable operation can be achieved by further obtaining the optimum condition for the focus gain at the same time.

Also, in this embodiment, the address reproduction,
Although the description has been given of the case where the focus offset value at the time of data portion reproduction and recording is learned, a focus offset value at which an address can be stably reproduced at the time of retrieval may be learned. As a result, it is possible to stably read the address at the time of high-speed search.

Furthermore, the method of learning all the focus offset values at the time of address reproduction, data part reproduction, and recording has been described. However, the correlation of the offset values may be obtained in each learning step. That is, most of the differences between the focus positions for reproduction of the address portion and the data portion depend on the solid-state performance difference to be collected. Therefore, in the manufacturing process of the optical recording / reproducing apparatus 1, the mutual deviation of each focus offset value with respect to the reference disk is obtained, and at least one of the focus positions is learned. ) Can be derived.

Alternatively, the learned focus conditions for address reproduction, data portion reproduction, and recording may be recorded on the optical recording medium 9. In this case, the learning step when the optical recording medium 9 is mounted next time on the optical recording / reproducing can be omitted,
The rise time of the device can be reduced.

(Embodiment 2) Further, the present invention is directed to an optical recording medium capable of performing recording on both the groove, which is a concave portion, and the land, which is a convex portion, of an uneven track formed on an optical recording medium capable of high-density recording. The playback device will be described.

FIG. 4 is a block diagram schematically showing an optical recording / reproducing apparatus which operates according to the method for recording / reproducing an optical recording medium according to the present embodiment. 1 have the same functions as those of the optical recording / reproducing apparatus 1 of FIG. 1 and operate in the same manner, and therefore the description thereof will be omitted. The focus servo circuit 3 includes a groove address focus setting unit 40, a land address focus setting unit 41, a groove data reproduction focus setting unit 42, a land data reproduction focus setting unit 43, a groove recording focus setting unit 44, and a land recording focus setting unit. 45 is connected via the operation mode changeover switch 18.

FIG. 5 is a flowchart showing the operation procedure of the optical recording / reproducing apparatus according to this embodiment. FIG. 5 is a flowchart illustrating an operation procedure of the optical recording / reproducing apparatus according to the present embodiment. In FIG. 5, operations from an optical recording medium mounting step 201 to a test area seek step 203 are the same as in the first embodiment, and a description thereof will be omitted.

First, in order to obtain the focus position of the groove address portion, in the focus position changing step 504, the focus servo circuit 3 changes the focus offset value continuously or stepwise.
Changes the focus state of the focused spot. The groove address reproduction step 505 continuously reproduces the address portion while changing the focus offset, and measures, for example, jitter as the address reproduction quality.

In the judgment 506, a focus offset value at which the address jitter becomes 13% is obtained as in the first embodiment. That is, the focus offset value Fag1 in the direction away from the optical recording medium and the focus offset value Fag2 in the direction approaching the optical recording medium are obtained. This Fa
Steps 504 and 50 until g1 and Fag2 are obtained.
5. Repeat steps 5 and 506. The groove address reproduction focus value setting step 507 is based on Fag1 and Fag2.
Fag which is the intermediate value, for example, (Fag1 + Fag
2) / 2 is obtained, and Fag is stored in the groove address focus setting unit 40 by the controller 7.

Next, in order to obtain the focus position of the land address portion, in the focus position changing step 508, the focus servo circuit 3 changes the focus offset value continuously or stepwise to thereby focus the focused spot. Change state. In the land address reproducing step 509, the address portion is continuously reproduced while the focus offset is changed, and for example, jitter is measured as the address reproducing quality.

In the judgment 510, as in the first embodiment, a focus offset value at which the address jitter becomes 13% is obtained. That is, the focus offset value Fal1 in the direction away from the optical recording medium and the focus offset value Fal2 in the direction approaching the optical recording medium are obtained. This Fa
Steps 508 and 50 are performed until l1 and Fal2 are obtained.
9. Repeat steps 9 and 510. In the land address reproduction focus value setting step 511, Fal, which is an intermediate value between Fal1 and Fal2, for example, (Fal1 + Fal
2) / 2 is obtained, and Fal is stored in the land address focus setting unit 41 by the controller 7.

Further, in order to determine the focus position of the groove data portion, in the focus position changing step 512, the focus servo circuit 3 changes the focus offset value continuously or stepwise. The groove data reproduction step 513 measures, for example, jitter as reproduction quality of the data portion.

In the judgment 514, as in the first embodiment, a focus offset value at which the jitter becomes 13% is obtained.
That is, a focus offset value Frg1 in a direction away from the optical recording medium and a focus offset value Frg2 in a direction approaching the optical recording medium are obtained. This Frg1 and Fg
Steps 512, 513, and 5 are performed until rg2 is obtained.
Repeat 14. In the groove data portion reproduction focus value setting step 515, an intermediate value Frg, for example, (Frg1 + Frg2) / 2 is obtained from Frg1 and Frg2, and the controller 7 stores the result in the groove data reproduction focus setting portion 42 in the groove data reproduction focus setting portion 42. .

Next, in order to determine the focus position of the land data portion, in a focus position changing step 516, the focus servo circuit 3 changes the focus offset value continuously or stepwise. The land data reproduction step 517 measures, for example, jitter as the reproduction quality of the data portion.

In decision 518, as in the first embodiment, a focus offset value at which the jitter becomes 13% is obtained.
That is, the focus offset value Fr11 in the direction away from the optical recording medium and the focus offset value Frg2 in the direction approaching the optical recording medium are obtained. Frl1 and F
Steps 516, 517, and 5 until rl2 is determined.
Repeat 18. In the land data portion reproduction focus value setting step 519, an intermediate value Frl, for example, (Frl1 + Frl2) / 2 is obtained from Frl1 and Frl2, and the result is stored in the land data reproduction focus setting portion 43 by the controller 7 in the land data reproduction focus setting portion 43. .

Further, in order to determine the focus position at the time of groove recording, in the focus position changing step 520, the focus servo circuit 3 changes the focus offset value continuously or stepwise. In the groove data portion recording step 521, the laser drive circuit 5 is set to the recording mode, and the modulated light is irradiated on the optical recording medium 9,
Record the data. Next, groove data section reproducing step 5
22 measures, for example, jitter as the reproduction quality of the data portion recorded in step 521.

In the judgment 523, as in the first embodiment, a focus offset value at which the groove data jitter is 13% is obtained. That is, the focus offset value Fwg1 in the direction away from the optical recording medium and the focus offset value Fwg2 in the direction approaching the optical recording medium are obtained. Step 52 is performed until Fwg1 and Fwg2 are obtained.
Repeat steps 0, 521, 522, and 523. The groove recording focus value setting step 524 includes Fwg1 and Fwg.
2, Fwg which is an intermediate value thereof, for example, (Fwg1
+ Fwg2) / 2 is obtained, and the recording focus setting unit 15 stores Fwg.

Six focus positions Fag, Fal, F
After learning of rg, Frl, Fwg, Fwl is completed,
The optical recording / reproducing device 46 enters a recording / reproducing standby state 530, and the optical recording / reproducing device 64 can perform address reproduction of both the groove and the land on the optical recording medium 9 and reproduction, additional writing, and rewriting of data.

As a result, when the laser beam 12 scans the groove, the focus offset value at the time of address reproduction, the focus offset value at the time of data portion reproduction, and the focus offset value at the time of recording when the laser beam 12 scans the groove are independently learned and set. . A focus offset value at the time of address reproduction when the laser beam 12 scans a land;
The focus offset value at the time of reproducing the data portion and the focus offset value at the time of recording are individually learned and set. In this case, when a groove or a land is scanned, when an address is reproduced with priority, when a data portion is reproduced with priority, or when recording is prioritized, an optimum focus offset value can be set. It becomes possible.

In this embodiment, only the focus offset has been described as the focus condition. However, a stable operation can be attained by further obtaining the optimum condition for the focus gain at the same time.

In this embodiment, the address reproduction,
The case of learning the focus offset value at the time of reproducing and recording the data portion has been described. However, in the case of the search mode in which the data portion is moved at high speed between a plurality of tracks, the focus position may be different. In particular, when data is recorded in both the land and the groove, the focus position of the address differs between the groove and the land. Therefore, it is desirable to set the third address focus position at the time of seeking. As a result, it is possible to stably read the address at the time of high-speed search.

Furthermore, the method of learning all the focus offset values at the time of address reproduction, data part reproduction, and recording has been described. However, the correlation of the offset values may be obtained in each learning step. That is, most of the differences between the focus positions for reproduction of the address portion and the data portion depend on the solid-state performance difference to be collected. Therefore, in the manufacturing process of the optical recording / reproducing apparatus 4, the mutual deviation of each focus offset value with respect to the reference disk is obtained, and at least one of the focus positions is learned. ) Can be derived.

(Embodiment 3) Next, based on the learning result,
The operation at the time of recording / reproduction and search will be described. FIG.
9 is a flowchart showing a procedure of a method for recording / reproducing an optical recording medium according to the third embodiment. In the standby state 217, after the series of steps of Embodiment 1, the optical recording / reproducing apparatus
It is in a state where reproduction, additional writing, and rewriting are possible, and is in a state of waiting for an instruction from the controller 7. In the search judgment 402, it is determined whether or not the controller 7 has output a search command.

Hereinafter, a case where the controller 7 outputs a search command will be described. In the address reproduction focus value setting step 403, the focus offset value of the address focus setting unit 13 is applied to the focus servo circuit 3 by the mode switch 18. Search step 40
In step 4, the optical head 2 is moved to a predetermined position while reading an address so that data can be reproduced from a target information storage area or data can be recorded in the information storage area. That is, in steps 403 and 404, the optical recording / reproducing apparatus 1 searches for the address reproduction in an easily readable state.

Next, a case where the controller 7 outputs a data reproduction command will be described. If the search judgment 402 is negative or if the data reproduction judgment 405 judges data reproduction, the data section reproduction focus value setting step 406 sets the focus offset value of the data reproduction focus setting section 14 to the focus by the mode switch 18. Applied to the servo circuit 3. In the data reproducing step 407, the spot of the laser beam 12 is
Is scanned, and information in the data portion is read. The reproduction circuit 6 demodulates the output signal of the optical head 2 into a data signal. The demodulated signal is sent to the host computer 8 via the controller 7. That is, steps 406 and 407
This means that the optical recording / reproducing apparatus 1 reads the data section and operates with less errors.

Next, a case where the controller 7 outputs a data recording instruction will be described. Data reproduction judgment 40
If No. 5, the recording focus value setting step 408 is performed.
The focus offset value of the recording focus setting unit 14 is applied to the focus servo circuit 3 by the mode switch 18. In the data recording step 409, the laser drive circuit 5 enters the recording mode, modulates the irradiation intensity of the laser beam 12 according to the recording data, and records the data on the optical recording medium 9. After the data is recorded, the process returns to the standby state 401 and enters a standby mode for waiting for the next search, reproduction, or recording command.

In the procedure shown in FIG. 6, the focus offset value at the time of address reproduction, the focus offset value at the time of data portion reproduction, and the focus offset value at the time of recording are respectively set according to the operation mode of the optical recording / reproducing apparatus 1. Can be selected independently. That is, at the time of retrieval, when reproducing with priority on the address, when prioritizing the reproduction quality of the data portion, or when prioritizing recording, it is possible to set an optimum focus offset value,
The operation of the device becomes stable.

In data reproduction, it is desirable to set an address focus position for the address portion and a data focus position for the data portion. However, the section of the address section is generally shorter than the section of the data section. Therefore, it is difficult to switch the servo operation in a short time. Conversely, the servo operation may become unstable. In the present invention, a stable servo operation is enabled by setting the address portion at the data focus position during data reproduction. Although the reproduction capability of the address portion is reduced, it is possible to complement the value of the previous and next address portions in a continuous reproduction operation. Similarly, even when the recording time address portion is set during recording, a stable recording operation can be performed by applying a recording focus offset.

[0058]

The recording / reproducing method for an optical recording medium according to the present invention comprises:
When the optical recording medium is mounted on the optical recording device, the focus offset value at the time of address reproduction, the focus offset value at the time of data portion reproduction, and the focus offset value at the time of recording can be independently learned and set. That is, it is possible to set an optimum focus offset value in each operation mode in which reproduction is performed with priority on an address, reproduction with priority on a data portion, or recording with priority. As a result, when the optical recording / reproducing apparatus performs a search operation, address errors are reduced and the search time can be shortened. Further, when the optical recording / reproducing apparatus performs a reproducing operation, it is possible to reproduce the data while enhancing the signal quality of the data. Further, at the time of recording, it is possible to perform writing while improving the recording quality of data.

[Brief description of the drawings]

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

FIG. 2 is a flowchart showing a focus learning procedure when recording and reproducing on the optical recording medium according to the first embodiment of the present invention;

FIG. 3 is a characteristic diagram showing a relationship between a focus offset value and a jitter according to the first embodiment of the present invention.

FIG. 4 is a block diagram schematically showing an optical recording / reproducing apparatus according to Embodiment 2 of the present invention.

FIG. 5 is a flowchart showing a procedure for setting a focus value according to an operation mode when recording / reproducing on an optical recording medium according to Embodiment 2 of the present invention;

FIG. 6 is a flowchart showing a procedure for setting a focus value according to an operation mode when recording and reproducing on an optical recording medium according to Embodiment 3 of the present invention;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Optical recording / reproducing apparatus 2 Optical head 3 Focus servo circuit 4 Tracking servo circuit 5 Laser drive circuit 6 Reproducing circuit 7 Controller 8 Host computer 9 Optical recording medium 10 Clamp 11 Spindle motor 12 Laser beam

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 5D090 AA01 BB04 CC01 CC04 DD03 EE11 EE16 FF05 JJ03 JJ12 5D118 AA13 AA18 AA27 BA01 BB07 BC07 BC12 BF16 CA11 CB01 CC05 CC12 CC15 CD02 CD07 CD11

Claims (17)

[Claims] An apparatus for recording / reproducing information on an optical recording medium capable of optically recording / reproducing, comprising: first focus setting means for reproducing an address portion on the optical recording medium; An optical recording medium recording / reproducing apparatus comprising: a second focus setting means for switching the first focus setting means and the second focus setting means in accordance with an operation mode of the recording / reproducing apparatus. 2. A recording / reproducing apparatus according to claim 1, wherein said mode switching means selects said first focus setting means when searching for a recording / reproducing position on said optical recording medium. 3. The recording / reproducing apparatus according to claim 1, wherein said second focus setting means is selected for both the address section and the data section when reproducing the data section. 4. The recording / reproducing apparatus according to claim 1, further comprising third focus setting means corresponding to recording of the data portion. 5. The recording / reproducing apparatus according to claim 2, wherein when information is recorded on said optical recording medium, said third focus setting means is selected for both an address part and a data part. 6. An apparatus for recording and reproducing information on an optically recordable optical recording medium, comprising: focusing means for focusing a laser beam on an address section or a data section provided on the optical recording medium; An optical recording medium comprising: an address section focus learning section for extracting a focus condition corresponding to reproduction of an address section by a focus section; and a data section focus learning section for extracting a focus condition corresponding to reproduction of a data section by the focus section. Recording and playback device. 7. The recording and reproducing apparatus according to claim 6, further comprising a recording focus learning unit for extracting a focus condition corresponding to the recording of the information. 8. The recording / reproducing apparatus according to claim 6, further comprising search focus learning means for extracting a focus condition at the time of searching for an information position on said optical recording medium. 9. An apparatus for recording and reproducing information on and from an optical recording medium having optically recordable concave and convex grooves, wherein a laser beam is focused on an address section or a data section provided on the optical recording medium. Focusing means for performing focusing; a recess address focus learning means for extracting a focus condition for reproducing an address portion when the laser beam scans the concave portion of the groove; and an address portion when the laser beam scans the convex portion of the groove. Convex portion address focus learning means for extracting a focus condition for reproduction; concave data focus learning means for extracting a focus state for reproducing a data portion when laser light scans a concave portion of the groove; A recording / reproducing apparatus for an optical recording medium, comprising: a convex data focus learning means for extracting a focus condition for reproducing a data portion when scanning a convex portion. 10. An apparatus for recording and reproducing information on and from an optical recording medium having optically recordable concave and convex grooves, wherein a laser beam is focused on an address section or a data section provided on the optical recording medium. A recording / reproducing apparatus for an optical recording medium, comprising: a focus unit for performing a search; and the focus unit, a search focus learning unit for extracting a focus condition during a search. 11. A method for recording and reproducing information on an optically recordable optical recording medium, comprising: a focusing step of converging a laser beam on an address portion or a data portion provided on the optical recording medium; A recording / reproducing method for an optical recording medium, comprising: an address part focus learning step of extracting a focus condition corresponding to reproduction of a data part; and a data part focus learning step of extracting a focus condition corresponding to reproduction of a data part. 12. The recording / reproducing method according to claim 11, further comprising a recording focus learning step of extracting a focus condition corresponding to the information recording. 13. The recording / reproducing method according to claim 11, further comprising a search focus learning step of extracting a focus condition at the time of searching for a position of the optical recording medium. 14. A method for recording / reproducing information on / from an optical recording medium having optically recordable concave / convex grooves, wherein a laser beam is focused on an address section or a data section provided on the optical recording medium. A focusing step to perform, a recess address focus learning step of extracting a focus condition for reproducing an address portion when the laser light scans the concave portion of the groove, and an address portion when the laser light scans the convex portion of the groove. A convex part address focus learning step for extracting a focus condition for reproduction; a concave part data focus learning step for extracting a focus state for reproducing a data part when the laser light scans the concave part of the groove; Recording / reproducing method for an optical recording medium, comprising: a convex data focus learning step of extracting a focus condition for reproducing a data portion when scanning a convex portion. 15. A method for recording / reproducing information on / from an optical recording medium having an optically recordable concave / convex groove, comprising a search focus learning step of extracting a focus condition at the time of a search. The recording / reproducing method as described. 16. The method according to claim 11, wherein the correlation between the focus conditions is determined by each of the learning steps.
16. The recording / reproducing method according to any one of items 15 to 15. 17. A learning result of each of the focus conditions is recorded on an optical recording medium.
The recording / reproducing method according to any one of the above items.