JPH07262685A - Optical disk drive device - Google Patents

Abstract

PURPOSE:To form an optical disk drive device capable of precisely performing CLV rotation control of a spindle motor when the data in not only a groove part but also a land part are recorded/reproduced. CONSTITUTION:This device is provided with a present position estimation means inputting a start address or a start disk radius of recording/reproducing the data when the data in the land part are recorded/reproduced and calculating a present absolute address or disk radius from recorded or reproduced data variable and a target number of revolution conversion means 15 converting the calculated present absolute address or disk radius to the target number of revolution R of the spindle motor 1. A motor rotation control means 4 comparing the converted target number of revolution R with a feedback signal Fb outputted from an encoder 2 generating one pulse or plural pulses per one revolution synchronizing with the rotation of the spindle motor 1 and performing the rotation control of the spindle motor 1 is provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disk drive device capable of controlling the rotation of a spindle motor suitable for a land & groove recording system.

[0002]

2. Description of the Related Art With the spread of multimedia (multi-optical disk), in addition to read-only types such as CD-DA and CD-ROM, the demand for write-once type CD-WO has increased in recent years to increase the capacity. Is desired. An example of the write-once type is disclosed in the electronic technology (1991, 6) as "utilization of dedicated IC in write-once CD system". In the case of a CD-WO type optical disc, this is formed by wobbling a guide groove provided on the disc surface, a reference pulse for rotation servo is obtained from this wobbled guide groove, and the position information is added to the wobble signal. (ATIP) is FM-modulated and loaded to control the rotation of the spindle motor, that is, the rotation speed of the optical disk.

Also, although there are differences in media reflectance, etc.,
Recently, rewritable types using phase change media have also been receiving attention. As an example of the rewritable type, there is one which is disclosed in the Sharp technique (1991, 3) as a "multimedia information system using a rewritable CD". In this case, a tracking groove on the optical disk is wobbled in the radial direction with an absolute address, and the optical disk rotational speed is controlled by CLV (Constant Liner Velocity) so that the wobble frequency becomes constant.

In the phase change type medium, since a minute light spot can be formed due to the characteristic of high temperature recording, it is possible to record on both the land and the groove by utilizing the characteristic. As an example of the phase change type medium, "High density phase change optical disk by land & groove recording" is a phase change recording workshop symposium (1
993, 11). this is,
The method of reducing crosstalk when recording is performed on both the land and the groove on the disk surface is described, and the crosstalk is reduced by controlling the groove depth.

[0005]

When recording is performed on both the land and the groove in this way, the recording density can be doubled as compared with the method of recording data only on the groove. The rewritable type used is drawing attention. However, when recording and reproducing the land and groove, there are the following problems. In consideration of the compatibility of recording or reproduction of a write-once CD-WO, tracking is performed even on phase-change media as specified in the standard document for so-called write-once CD-WO (so-called ORANGE BOOK). The wobbling is performed in the radial direction of the disk so that the absolute address can be detected from the groove for use (see FIG. 11 described later).

FIG. 9 shows an example of a rotation control system of a conventional spindle motor 1 for rotating a phase-change type medium constituted by such wobbles. The rotation speed of the spindle motor 1 is detected by the encoder 2 and sent to the waveform shaping circuit 3, one output of which is sent to the phase comparator 4a as a feedback signal Fb and the other output of which is f-.
It is sent to the calculator 7 via the V converter 5 and the HPF 6. In the phase comparator 4a, the feedback signal Fb, that is, the synchronization pulse generated from the wobble (absolute address) is compared with the target pulse (signal P) having a constant frequency, and the output value obtained by the comparison is compared. It is sent to the arithmetic unit 7 via the LPF 8. In this computing unit 7, the output value from the LPF 8 and the output value from the HPF 6 are combined, the correction value is sent to the power amplifier 9, and the rotation speed of the spindle motor 1 is controlled based on the amplified signal. Done. In addition,
FIG. 10 shows a configuration example of a conventional CD-WO type optical disc drive device. This device is an ECC
/ EDC ENCODER10, EFM / CIRC EN
The CODER 11 and the ATIP DECODER 12 can be constructed by using a gate array or the like and combining them with an existing CD LSI.

FIG. 11 shows an example of the wobble structure of a phase change medium for performing land & groove recording. In this case, when performing the CLV control of the spindle motor 1 in the groove portion G during recording or reproduction, the groove portion G
Since the wobbles formed in the groove grooves 13 adjacent to each other have the same phase, the absolute address superimposed on the wobble signal can be accurately detected, and the synchronization pulse (feedback signal Fb generated based on the absolute address) can be detected. ) And a target pulse (a signal Po having a constant frequency) are input to the phase comparator 4 (see FIG. 9 described above), and PLL control is performed so as to lock at this position. CLV rotation control can be accurately performed. However, when the CLV control of the spindle motor 1 is performed at the land portion L during recording or reproduction, the wobble phases formed in the adjacent groove grooves 13 are different on both sides, so that the absolute address can be detected correctly. Not possible, and as a result, CLV of spindle motor 1
There is a problem that the rotation control cannot be performed accurately.

[0008]

According to a first aspect of the present invention, there is used a write-once or rewritable optical disc in which an absolute address is superposed on a groove groove formed by wobbling.
In an optical disk drive device that records and reproduces data on both the land portion and the groove portion while rotating the optical disc at a constant linear velocity by a spindle motor, when recording or reproducing the data on the land portion, The present position estimating means for calculating the current absolute address or disk radius from the amount of data recorded or reproduced while the start address or start disk radius is input is provided, and the calculated current absolute address or disk radius is used for the spindle motor. Target rotation speed conversion means for converting the target rotation speed to the target rotation speed of the spindle motor is synchronized with the rotation of the spindle motor.
Motor rotation control means for controlling rotation of the spindle motor by comparing with a feedback signal output from an encoder that generates a pulse or a plurality of pulses is provided.

According to the second aspect of the present invention, a write-once or rewritable type optical disc in which an absolute address is superposed on a groove groove formed by wobbling is used, and the optical disc is landed while being rotated at a constant linear velocity by a spindle motor. Feedback for counting feedback signals output from an encoder that generates one pulse or a plurality of pulses per rotation in synchronization with the rotation of the spindle motor in an optical disk drive device that records and reproduces data in both the groove section and the groove section A signal counting means is provided, and at the time of recording or reproducing the data in the land portion, the start address or the start disk radius of the data recording or reproduction is input, and the current absolute address or the disk radius is calculated from the counted feedback amount. A current position estimation means for calculating A target rotation speed conversion means for converting the calculated current absolute address or disk radius into the target rotation speed of the spindle motor is provided, and the converted target rotation speed is compared with the feedback signal output from the encoder. Motor rotation control means for controlling the rotation of the spindle motor is provided.

In the invention of claim 3, claim 1 or 2
In the invention described above, the header information detecting means for detecting the absolute address or the disk radius from the header information recorded together with the data when the data is reproduced is provided.

According to a fourth aspect of the invention, in the third aspect of the invention, when detecting the absolute address or the disk radius from the header information, a plurality of the header information are continuously observed and the header information has a continuity. A means for determining continuity of header information for checking the sex is provided.

According to the invention of claim 5, claim 1 or 2
In the described invention, when recording data, when the amount of data to be recorded is larger than a certain amount, the data to be recorded is divided into a plurality of data groups, and the data is divided into each divided data group. Data division recording means for recording and controlling the rotation of the spindle motor is provided.

According to a sixth aspect of the invention, in the fifth aspect of the invention, a designated area for writing a recording start address or a recording end address for each divided data group is provided in the optical disc.

According to the invention of claim 7, in the invention of claim 6, the TOC area is used as the designated area.

According to an eighth aspect of the invention, in the fifth aspect of the invention, when reproducing the data, when it is necessary to jump to a plurality of divided and recorded data groups, the division is performed. A data time-division reproducing means for reproducing the data by time-division for each of the recorded and recorded data groups is provided.

[0016]

According to the first aspect of the present invention, when recording or reproducing data in the land portion, the initial rotational speed of the spindle motor is set based on the start address of recording or reproducing data sent from the controller, afterwards,
Calculates the absolute address of the optical disc currently being tracked by the optical pickup unit, that is, the absolute address position or the disc radius, that is, the disc radial position, based on the amount of recorded or reproduced data, and the calculated current absolute address position or disc radial position The target rotation speed of the spindle motor corresponding to the above is obtained at any time, and this target rotation speed is compared with the feedback signal output from the encoder that generates one pulse or multiple pulses per rotation in synchronization with the rotation of the spindle motor. It is possible to give the spindle motor an optimum rotation speed.

According to the second aspect of the present invention, at the time of recording or reproducing the data in the land portion, the initial rotation number of the spindle motor is set based on the recording or reproducing start address of the data sent from the controller, After that, the feedback signal output from the encoder that generates one pulse or a plurality of pulses per rotation in synchronization with the rotation of the spindle motor is counted, and the optical pickup unit is currently tracking based on the feedback amount obtained thereby. Calculate the absolute address of the optical disk, that is, the absolute address position, or the disk radius, that is, the disk radial position, find the target rotation speed of the spindle motor that corresponds to the calculated current absolute address position or disk radius position, and then calculate this target rotation speed. It is synchronized with the rotation of the spindle motor. By comparing the feedback signal output from the coder, it is possible to impart to the spindle motor an optimal speed.

According to the third aspect of the invention, at the time of reproducing the data, the absolute address of the optical disk currently being tracked by the optical pickup unit, that is, the absolute address position or the disk radius, is read from the header information recorded together with the data. That is, by determining the disk radial position, it is possible to give the optimum rotational speed to the spindle motor based on the feedback signal and the target rotational speed of the spindle motor corresponding to the calculated absolute address position or disk radial position at the present time. Becomes

According to the fourth aspect of the invention, when the disk radial position or absolute address position on the optical disk currently tracked by the optical head is obtained from the header information recorded together with the data, the header information has the information. If the header information is judged to be incorrect from the viewpoint of continuity, it is corrected correctly, and the corrected header information is used to determine the radial position or absolute address position on the optical disk. Even if the header information detected sometimes is incorrect, it can be used after it is correctly corrected, which makes it possible to reliably calculate the current absolute address position or disk radial position.

In the fifth aspect of the invention, when recording data, if the amount of data to be recorded is larger than a certain amount, the data to be recorded is divided into a plurality of data groups, and the divided data groups are divided. By controlling the rotation of the spindle motor for each data group, the rotation control error of the spindle motor that occurs when recording data and the accumulation of each calculation of the current absolute address position or disk radial position are minimized. It becomes possible.

According to the sixth aspect of the present invention, the recording start address or the recording end address of each divided data group is written in a specified area, so that the recording and reproducing of the division condition at the time of recording the data can be performed at any time. It becomes possible to do.

In the seventh aspect of the invention, by using the TOC area as the designated area, it is not necessary to purposely provide a special area for recording and reproducing the division condition when recording the data.

According to the eighth aspect of the present invention, when reproducing the data, when it is necessary to reproduce while dividing into a plurality of divided and recorded data groups, the divided and recorded data is recorded. By reproducing the data by time division for each group, it is possible to reproduce the data without being affected by the deviation in the vicinity of the joint of the data group which occurs when the data is divided and recorded.

[0024]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the invention described in claim 1 will be described with reference to FIGS. The description of the same parts as in the conventional example is omitted, and the same parts are denoted by the same reference numerals. In this embodiment, a write-once or rewritable type optical disc (see FIG. 11) in which an absolute address is superposed on a groove groove 13 formed by wobbling is used, and this optical disc is controlled by a spindle motor 1 at CLV (constant linear velocity). In an optical disk drive device that records and reproduces data in both the land portion L and the groove portion G while rotating at, the data recording or reproducing operation is performed when the data is recorded or reproduced in the land portion L as shown in FIG. A current absolute address estimator 14 is provided as current position estimating means for calculating the current absolute address from the amount of data recorded or reproduced while the start address is input, and the calculated current absolute address is set as the target of the spindle motor 1. A conversion table 15 is provided as a target rotation speed conversion means for converting the rotation speed into the target rotation speed. R and the spindle motor 1
Is provided with a phase comparator 4 as a motor rotation control means for controlling rotation of the spindle motor 1 by comparing with a feedback signal Fb output from an encoder 2 that generates one pulse or a plurality of pulses per rotation in synchronization with the rotation of the spindle motor 1. It is a thing. In the present embodiment, the case where the current absolute address is calculated by the current position estimating means will be described, but in addition to this, the current disk radius may be calculated.

In such a structure, first, when data is recorded or reproduced in the groove portion G (see FIG. 11), an absolute address obtained from a wobble previously formed in the groove groove 13 as in the conventional case. Based on the above, the CLV rotation control of the spindle motor 1 can be performed.
On the other hand, in the land portion L, the absolute address is not obtained at the time of recording or reproducing the data, but the pulse output in synchronization with the rotation of the spindle motor 1 (one pulse or a plurality of pulses per revolution). Either is acceptable) as the feedback signal Fb. Further, the current absolute address estimator 14 estimates the current absolute address position Ad based on the information of the actually recorded or reproduced data amount, and the conversion table 15 is used to estimate the target of the spindle motor 1 from the absolute address position Ad. Convert the rotation speed R. Then, by inputting the feedback signal Fb and the target rotation speed R to the phase comparator 4 and updating or setting the rotation speed to be sent to the spindle motor 1 at any time, even when recording or reproducing data in the land portion L. , CLV rotation control can be realized accurately.

Now, the operation of recording or reproducing the data in the land portion L will be described in more detail with reference to the flowchart of FIG. First, the start address for recording or reproducing the data sent from the system controller (see FIG. 10) is input to the conversion table 15 to convert the initial target rotation speed, and the initial target rotation speed is applied to the spindle motor 1. set. Next, after confirming that the PLL control for controlling the rotation of the spindle motor 1 at the start address is locked stably, recording or reproducing of data is started. Next, the recorded or reproduced data amount is input to the present absolute address estimator 14 to estimate the present absolute address position Ad, and the estimated absolute address position A
d is input to the conversion table 15 to convert the target rotation speed R, and the target rotation speed R and a pulse (feedback signal Fb) output in synchronization with the rotation of the spindle motor 1 are input to the phase comparator 4. As a result, the spindle motor 1 can always be controlled to the target rotation speed R. After that, every time a specified amount of data is recorded or reproduced, the target rotation speed R is updated and reset, so that stable C
LV control can be performed. In this case, the basic frequency (channel clock) for recording or reproducing data is uniquely determined, and when recording data, the channel clock generated by a highly accurate oscillator such as a crystal oscillator is used as the reference. When forming data and reproducing the data, the recorded data is reproduced on the basis of the channel clock. However, according to the recorded or reproduced data amount input to the current absolute address estimator 14, the data is recorded or reproduced. The amount of movement of the positional relationship between the optical pickup unit and the optical disc after the reproduction is started can be known.

In other words, the track formed on the optical disc is spiral, and the position of the optical pickup unit moves in the radial direction of the optical disc as time passes after recording or reproducing of data is started. Therefore, one rotation of the optical disk results in a radial movement of one track pitch. Therefore, the linear speed is not constant at the initial rotation speed of the spindle motor 1 set at the time when data recording or reproduction is started. Therefore, the disk radius currently being tracked by the optical pickup unit is obtained from the disk radius at which data recording or reproduction is started and the movement amount, and the current disk radius is calculated before the required linear velocity fluctuation width is exceeded. By repeatedly executing the operation of updating the target rotation speed R of the spindle motor 1 according to the above, the CLV rotation control of the spindle motor 1 can always be performed stably and accurately.

Next, an embodiment of the invention described in claim 2 will be described with reference to FIGS. 3 and 4. The description of the same parts as those in the first aspect of the present invention will be omitted, and the same reference numerals will be used for the same parts. In the present embodiment, the present disk radius estimator 16 is used as the present position estimating means. Further, the present disk radius estimator 16 serves as feedback signal counting means for counting the feedback signal Fb output from the encoder 2 that generates one pulse or a plurality of pulses per rotation in synchronization with the rotation of the spindle motor 1. A pulse counter 17 is connected. As a result, the current disk radius estimator 16 calculates the current disk radius from the feedback amount that is input while the data recording or reproducing start disk radius is input at the time of recording or reproducing data in the land portion L. In this embodiment, the case where the current disk radius is calculated by the current position estimating means will be described, but in addition to this, the current absolute address may be calculated.

The operation of recording or reproducing data in the land portion L in such a configuration will be specifically described with reference to the flowchart of FIG. In the embodiment of the invention described in claim 1 described above, the absolute address position Ad currently being tracked by the optical pickup unit is obtained based on the amount of recorded or reproduced data, but here, the pulse counter is used. The present disk radial position D is obtained from the feedback amount counted in 17. That is, first, the number of tracks moved is detected by counting the number of pulses output in synchronization with the rotation of the spindle motor 1 after the start of recording or reproducing data by the pulse counter 17 (optical disc 1 One track is moved by rotation), and the detected number of tracks is input to the current disk radius estimator 16 (the current disk radius estimator 16 also receives the start disk radius at which data recording or reproduction is started). . Then, the current disk radius estimator 16 estimates the disk radius position D currently being tracked by the optical pickup unit (not shown). The estimated disk radial position D can be input to the conversion table 15 to calculate the target rotational speed R of the spindle motor 1. After that, by repeating the operation of updating the target rotation speed R of the spindle motor 1 according to the current disk radial position D, the rotation control of the spindle motor 1 can always be performed at an accurate rotation speed. .

Next, an embodiment of the present invention as defined in claims 3 and 4 will be described with reference to FIGS. The description of the same parts as those in the first aspect of the present invention will be omitted, and the same reference numerals will be used for the same parts. In this embodiment, the current absolute address detector 18 is provided as a header information detecting means for detecting an absolute address (or disk radius) from the header information recorded together with the data when reproducing the data. Specifically, when reproducing the data, the absolute address position Ad, which is the absolute address information, is detected from the header information 20 recorded together with the data 19 having the format configuration as shown in FIG. The rotation speed of the spindle motor 1 can be controlled accurately by converting the detected absolute address position Ad to the target rotation speed R using the conversion table 15. The spindle motor 1 for recording data
The rotation control can be performed by executing the operation of the embodiment (see FIGS. 1 and 3) of the invention described in claim 1 or 2.

Further, in the present embodiment, when detecting the absolute address position Ad (or disk radius) from the header information 20 in the data 19, a plurality of header information 20 are continuously observed and the header information 20 of the header information 20 is detected. Header information continuity determining means (not shown) for checking continuity of the information may be provided.
Specifically, from the header information 20, the absolute address position Ad
As shown in FIG. 7, when detecting the error, the characteristic of continuity of the address (3 minutes 3 seconds 3 blocks ... 3 minutes 3 seconds 6 blocks ...) Is used to detect the erroneously detected address (5 minutes By finding (3 seconds 6 blocks) and correcting (interpolating) to a predetermined address (3 minutes 3 seconds 5 blocks), it is possible to detect the present absolute address position Ad more accurately. The rotation control can be performed more accurately.

Next, an embodiment of the invention described in claims 5 to 8 will be described with reference to FIG. The description of the same parts as those in the first aspect of the present invention will be omitted, and the same reference numerals will be used for the same parts. For example, when a huge amount of data such as a CD-ROM is transferred to the land portion L of the phase change medium, if the operation as in the embodiment of the invention described in claim 1 or 2 is executed as it is, the spindle motor 1 The rotational control error and the current disc radius detection error are gradually accumulated, but they are not preferable.

Therefore, in the present embodiment, when recording data, if the amount of data to be recorded is larger than a certain amount, the data to be recorded is divided into a plurality of data groups and the divided data is divided. Data division recording means (not shown) for recording data for each group and controlling the rotation of the spindle motor 1
Was set up. Specifically, as shown in FIG. 8A, when the amount of data 19 to be recorded is enormous, the enormous amount of data 19 is divided into a plurality of data groups 1 to n, and the divided data group Each time, the operation as in the embodiment of the invention described in claim 1 or 2 (see FIGS. 1 and 3) is executed. As a result, the accumulated rotation control error of the spindle motor 1 as described above can be minimized, and even in a huge amount of recorded data such as a CD-ROM,
The data can be transferred onto the land portion L of the phase change medium with high accuracy.

Further, in this embodiment, the recording start address (or recording end address) for each of the divided data groups
A designated area 21 for writing the may be provided in the optical disc. As the designated area 21, a TOC (Table Of Contents) area can be used as shown in FIG. 8B. With this, it is possible to record or reproduce the division condition when recording data at any time.
Further, by using the TOC area, it is not necessary to purposely provide a special area for recording or reproducing division conditions when recording data.

Further, in the present embodiment, when reproducing data, when it is necessary to jump and reproduce a plurality of divided and recorded data groups 1 to n, the data is divided and recorded. A data time division reproduction means (not shown) may be provided for reproducing the data by time division for each data group.
As a result, even if there is a recording error that occurs near the joint between the data groups 1 to n, the data can be reproduced without being affected by the error. In the optical disk drive device using the phase change medium as described in each of the embodiments, if there is no problem such as crosstalk at the time of land & groove recording, even if the phase change medium is not used, the MO The same effect (the effect that the rotation control of the spindle motor 1 that is most suitable for land & groove recording can be performed) can be obtained by using a mold medium or a dye-based medium.

[0036]

According to the first aspect of the present invention, a write-once or rewritable type optical disc in which an absolute address is superposed on a groove groove formed by wobbling is used, and the optical disc is rotated at a constant linear velocity by a spindle motor. Meanwhile, in an optical disk drive device that records and reproduces data in both the land portion and the groove portion, at the time of recording or reproducing data in the land portion, a start address or a start disc radius of recording or reproducing data is input and recorded. Alternatively, a current position estimation means for calculating the current absolute address or disk radius from the reproduced data amount is provided, and a target rotation speed conversion means for converting the calculated current absolute address or disk radius into the target rotation speed of the spindle motor. Is provided for the converted target speed and the rotation of the spindle motor. By providing a motor rotation control means for controlling rotation of the spindle motor by comparing with a feedback signal output from an encoder that generates one pulse or a plurality of pulses per rotation, an optimum rotation speed is given to the spindle motor. Therefore, the CLV rotation control of the spindle motor can be accurately performed even in the land portion where the absolute address cannot be obtained from the wobble.

According to a second aspect of the present invention, a write-once or rewritable type optical disc in which an absolute address is superposed on a groove groove formed by wobbling is used, and the optical disc is landed while being rotated at a constant linear velocity by a spindle motor. Feedback for counting feedback signals output from an encoder that generates one pulse or a plurality of pulses per rotation in synchronization with the rotation of the spindle motor in an optical disk drive device that records and reproduces data in both the groove section and the groove section A signal counting means is provided, and at the time of recording or reproducing the data in the land portion, the start address or the start disk radius of the data recording or reproduction is input, and the current absolute address or the disk radius is calculated from the counted feedback amount. Providing a current position estimation means for calculating Target rotation speed conversion means for converting the current absolute address or disk radius issued to the target rotation speed of the spindle motor is provided, and the converted target rotation speed is compared with the feedback signal output from the encoder. Since the motor rotation control means for controlling the rotation of the spindle motor is provided, the optimum rotation speed can be given to the spindle motor, and the CLV of the spindle motor can be obtained even in the land portion where the absolute address cannot be obtained from the wobble. The rotation control can be accurately performed.

According to a third aspect of the present invention, in the first or second aspect of the invention, when reproducing the data, header information detection for detecting an absolute address or a disk radius from the header information recorded together with the data is detected. Because we have a means,
The optimum rotation speed can be given to the spindle motor, and the CLV rotation control of the spindle motor can be performed extremely accurately.

According to a fourth aspect of the invention, in the third aspect of the invention, when detecting the absolute address or the disk radius from the header information, a plurality of the header information are continuously observed and the continuity of the header information is possessed. Since the header information continuity determining means for checking the property is provided, the current absolute address position or the disk radius position can be reliably calculated, and the spindle motor can always be controlled with an accurate rotation speed.

According to a fifth aspect of the invention, in the invention of the first or second aspect, when recording data, if the amount of data to be recorded is larger than a certain amount, a plurality of data to be recorded are recorded. Since the data division recording means for controlling the spindle motor rotation by recording the data for each divided data group by dividing the data group is provided, the spindle motor rotation control error that occurs when recording the data and the current It is possible to minimize the accumulated error such as the calculation error of the absolute address position or the disk radial position of the CD-
Even a huge amount of recorded data such as a ROM can be highly accurately transferred to the land portion of the phase change medium.

According to the invention of claim 6, in the invention of claim 5, since a designated area for writing a recording start address or a recording end address for each divided data group is provided in the optical disk, It is possible to record or reproduce the division condition at the time of recording at any time, and to improve workability.

In the invention according to claim 7, in the invention according to claim 6, the TOC area is used as the designated area. Therefore, the areas are separately prepared for recording and reproducing the division condition when recording the data. It is not necessary to provide it and can be economical.

According to an eighth aspect of the invention, in the invention of the fifth aspect, when reproducing the data, when it is necessary to reproduce while dividing into a plurality of divided and recorded data groups, the division is performed. Since the data time division reproduction means for reproducing the data by time division for each data group recorded and recorded is provided, it is affected by the deviation near the joint of the data group which occurs when the data is divided and recorded. It is possible to reproduce data without increasing the reliability.

[Brief description of drawings]

FIG. 1 is a block diagram showing the configuration of a rotation control system of a spindle motor in an optical disk drive device according to an embodiment of the invention as set forth in claim 1;

FIG. 2 is a flowchart showing an operation for setting a spindle motor to a target rotation speed.

FIG. 3 is a block diagram showing a configuration of a rotation control system of a spindle motor in the optical disk drive device according to the second embodiment of the invention.

FIG. 4 is a flowchart showing an operation for setting a spindle motor to a target rotation speed.

FIG. 5 is a block diagram showing a configuration of a rotation control system of a spindle motor in an optical disk drive device according to an embodiment of the present invention.

FIG. 6 is a schematic diagram showing a data format when an absolute address is included in header information.

FIG. 7 is a schematic diagram showing how header information is interpolated.

FIG. 8 shows an embodiment of the invention described in claims 5 to 8, (a) is a schematic diagram showing a format of data divided into a plurality of data groups, and (b) is a recording start address. It is a schematic diagram which shows the mode in the recorded TOC area.

FIG. 9 is a block diagram showing the configuration of a conventional spindle motor rotation control system.

FIG. 10 is a block diagram showing a configuration of a CD-WO drive device.

FIG. 11 is a schematic diagram showing a wobble structure of a phase change medium.

[Explanation of symbols]

 1 Spindle Motor 2 Encoder 4 Motor Rotation Control Means 13 Groove Groove 14 Current Position Estimating Means 15 Target Rotation Speed Converting Means 16 Current Position Estimating Means 17 Feedback Signal Counting Means 18 Header Information Detecting Means 19 Data 20 Header Information 21 Designated Area (TOC)

Claims (8)

[Claims] 1. A write-once type or rewritable type optical disc in which an absolute address is superposed on a groove groove formed by wobble is used, and both the land portion and the groove portion are rotated while the optical disc is rotated at a constant linear velocity by a spindle motor. In an optical disk drive device that records and reproduces data in and from the data recording or reproducing area, the start address or the starting disk radius of the data recording or reproducing is input, and the current amount of data is recorded or reproduced. The present position estimation means for calculating the absolute address or the disk radius is provided, and the target rotation speed conversion means for converting the calculated current absolute address or disk radius into the target rotation speed of the spindle motor is provided, and the converted target is provided. In synchronization with the rotation speed and the rotation of the spindle motor, one pulse or Is provided with motor rotation control means for controlling rotation of the spindle motor by comparing with a feedback signal output from an encoder that generates a plurality of pulses. 2. A write-once or rewritable optical disc in which an absolute address is superposed on a groove groove formed by wobbling, and both the land portion and the groove portion are rotated while the optical disc is rotated at a constant linear velocity by a spindle motor. In an optical disk drive device for recording and reproducing data, a feedback signal counting means for counting feedback signals output from an encoder that generates one pulse or a plurality of pulses per rotation in synchronization with the rotation of the spindle motor is provided. At the time of recording or reproducing data in the land portion, a current address estimating means for inputting a start address or a start disk radius of data recording or reproduction and calculating a current absolute address or disk radius from the counted feedback amount The calculated current absolute value Target rotation speed conversion means for converting the dress or disk radius into the target rotation speed of the spindle motor is provided, and the converted target rotation speed is compared with the feedback signal output from the encoder to control the rotation of the spindle motor. An optical disk drive device comprising a motor rotation control means for performing the above. 3. The header information detecting means for detecting an absolute address or a disk radius from header information recorded together with the data when reproducing the data, according to claim 1 or 2. Optical disk drive device. 4. A header information continuity determining means for observing a plurality of the header information continuously to check continuity of the header information when detecting an absolute address or a disk radius from the header information. The optical disk drive device according to claim 3, which is characterized in that. 5. When recording data, when the amount of data to be recorded is larger than a certain amount, the data to be recorded is divided into a plurality of data groups, and the data is divided for each of the divided data groups. 3. The optical disk drive device according to claim 1, further comprising data division recording means for recording and controlling rotation of a spindle motor. 6. The optical disc drive apparatus according to claim 5, wherein a designated area for writing a recording start address or a recording end address for each of the divided data groups is provided in the optical disc. 7. A TOC (Table Of
7. The present invention is characterized in that a Contents area is used.
The optical disk drive device described. 8. When reproducing data, when it is necessary to reproduce while dividing into a plurality of divided and recorded data groups, time division is performed for each divided and recorded data group. 6. The optical disk drive device according to claim 5, further comprising a data time division reproducing means for reproducing data.