JP2004246950A - Optical disk, optical disk unit, writing method of optical disk and reading method of optical disk - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical disk, in which data having a capacity larger than a specified storage capacity are written, an optical disk unit and a writing method of the optical disk capable of writing the data having the capacity larger than the specified storage capacity into the optical disk, and the optical disk unit and a reading method of the optical disk for reading out the data from the optical disk written with the data having the capacity larger than the specified storage capacity. <P>SOLUTION: The method includes a wobble CLV control step for controlling a rotation speed of the optical disk D so that a wobble period read by rotating the optical disk D becomes a prescribed period, and a data writing step for writing the data with the recording density different from the recording density determined in accordance with the preformat information by writing the data into the optical disk D rotationally controlled with the wobble CLV control step, at the recording period different from the recording period of the data determined from the prescribed period of the above wobble. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an optical disk on which data can be written, and an optical disk device, an optical disk writing method, and an optical disk reading method for reading and writing data on an optical disk on which data can be written.
[0002]
[Prior art]
In recent years, as a medium suitable for writing and storing long-time music or video, or large-volume data handled by a computer or the like, CD-R, CD-RW, DVD-R, DVD-RW, etc. Writable optical disks are widely used.
[0003]
As an example, a method of writing data to a CD-R or CD-RW is specified in the so-called Orange Book.
The recording groove of a CD-R or CD-RW (hereinafter simply referred to as a CD-R) is slightly wavy at a substantially constant wavelength (27 μm on average) before data is written (see FIG. 1). 9). This wavy shape is called "wobble". The wobble is formed over the entire recording groove of the CD-R. The wobble is formed into an FM-modulated waveform, and by demodulating the wobble waveform at each position on the recording groove, an ATIP address (preformat information) representing position information (time information) at that position on the recording groove is read. (See Non-Patent Document 1).
[0004]
The Orange Book specifies that data (sub-coding frames) of a predetermined unit (size) is written according to the position information of the ATIP address so as to match the position. By doing so, the position information indicated by the ATIP address matches the position information included in the subcode (subcode Q) of the written data (subcoding frame), and the data is written to the CD-R. It is.
[0005]
In order to write data to the CD-R so as to match the ATIP address, the data may be written based on a wobble waveform (period) formed at a constant wavelength.
2. Description of the Related Art Conventionally, an optical disk device such as a CD-R drive generally writes data on an optical disk by the following method in order to write data in accordance with a wobble waveform (cycle). That is, the optical disk is rotated, and the pickup that reads the recording state on the recording groove of the optical disk is used to observe the period of the wobble wave (so-called wobble signal period) and rotate the optical disk so that the wobble signal has a constant period. By controlling the speed, CLV control of the optical disc is performed. While the optical disc is CLV controlled, data is written to the optical disc at a predetermined cycle (recording cycle) corresponding to the cycle of the wobble signal. By doing so, data can be written at a fixed recording density to wobbles of a fixed wavelength.
[0006]
When reading data from a CD-R or CD-RW on which data has been written, the optical disc apparatus recognizes the position of the data to be read on the optical disc based on the position information included in the ATIP or subcode. are doing.
[0007]
Note that the form of preformat information recorded in advance on a writable optical disc in order to determine a data write position differs depending on the type of the optical disc. For example, in a CD-R or CD-RW, as described above, the preformat information is an ATIP address represented by a wobble. In DVD + R and DVD + RW, the preformat information is an ADIP address represented by a wobble. In DVD-R and DVD-RW, the preformat information is an ADIP address represented by a prepit (LPP) in a land on the disk recording surface.
In this detailed description, the preformat information includes the ATIP address represented by the wobble, the ADIP address represented by the wobble or the prepit, and the like.
[0008]
[Non-patent document 1]
Heitaro Nakajima, Takao Ibashi, Hiroshi Ogawa, First Edition, “General Multimedia Selection CD Family”, Japan, Ohmsha, April 25, 1996, p. 70-72
[0009]
[Problems to be solved by the invention]
However, according to the conventional optical disc writing method based on the Orange Book, data is written at a cycle corresponding to the cycle of a wobble signal formed in advance on the optical disc (that is, according to position information of preformat information such as ATIP). Therefore, there is a problem that data having a capacity larger than a predetermined storage capacity cannot be written on the optical disc. For example, data with a capacity larger than the rated capacity, such as 650 MB (corresponding to 74 minutes of music data) or 700 MB (corresponding to 80 minutes of music data), which is defined as the recording capacity of an optical disc such as a CD-R, cannot be written. There is a problem that time music and larger capacity data cannot be stored on the optical disc.
[0010]
The present invention has been made to solve the above-described problems, and an object of the present invention is to write an optical disc on which data having a larger storage capacity than a predetermined storage capacity is written, and to write data having a larger storage capacity than a predetermined storage capacity on an optical disc. It is an object of the present invention to provide a possible optical disk device and an optical disk writing method, and an optical disk device and an optical disk reading method for reading data from an optical disk on which data having a larger storage capacity than a predetermined storage capacity has been written.
[0011]
[Means for Solving the Problems]
An optical disc according to the present invention has the following configuration in order to solve the above-mentioned problem. That is, the recording density of the data to be written is determined by the preformat information recorded in advance in the recording groove. In a data writable optical disk, the data density is different from the recording density determined by the preformat information. Is written.
According to this, it is possible to obtain an optical disc on which data having a capacity different from the recording capacity determined by the preformat information is written.
[0012]
Further, the recording density of the data is higher than the recording density determined by the preformat information.
According to this, it is possible to obtain an optical disk on which data having a larger capacity than the recording capacity determined by the preformat information is written.
[0013]
Further, an optical disk device according to the present invention has the following configuration in order to solve the above problems. That is, the recording density of the data to be written is determined by the preformat information pre-recorded in the recording groove, and in an optical disc device that writes data to an optical disc on which data can be written, the recording density determined by the preformat information is Comprises data writing means for writing data to the optical disc at different recording densities.
According to this, data of a capacity different from the recording capacity determined by the preformat information can be written on the optical disc.
[0014]
The preformat information is represented by wobbles formed in a recording groove at a fixed wavelength, and the rotation speed of the optical disc is adjusted so that the cycle of the wobbles read by rotating the optical disc becomes a predetermined cycle. A wobble CLV control means for controlling the wobble CLV control means, wherein the data writing means writes data on the optical disc whose rotation is controlled by the wobble CLV control means at a recording cycle different from a data recording cycle determined from the predetermined cycle of the wobble. By writing data at a recording density different from the recording density determined by the preformat information.
According to this, data is written on an optical disc rotating at a constant linear velocity at a cycle different from a recording cycle determined from a wobble cycle (cycle of a wobble signal), and therefore has a different recording capacity from that determined by preformat information. The capacity data can be written.
[0015]
Further, the data writing means writes the data to the optical disc at a recording cycle shorter than a recording cycle of the data determined from the predetermined cycle of the wobble, so that the data density is higher than a recording density determined by the preformat information. Is written.
According to this, data having a larger capacity than the recording capacity determined by the preformat information can be written on the optical disc.
[0016]
Also, pre-format information indicating the position information on the recording groove is pre-recorded in the recording groove, and the written data is read from an optical disk capable of writing data with a subcode including the position information on the recording groove in the recording groove. In the optical disk device, before reading data from the optical disk, read position information represented by preformat information of a predetermined position of a recording groove of the optical disk and position information included in a subcode of the data at the predetermined position, Position information determining means for determining whether or not the position information of the preformat information matches the position information of the subcode; and the position information determining means determines the position information of the preformat information and the position of the subcode. If it is determined that the information matches, the preformat information and / or the HF signal The data of the optical disk is read based on the HF signal read from the optical disk when the position information determining unit determines that the position information of the preformat information does not match the position information of the subcode. Data reading means for reading data from the optical disk based on the data.
According to this, by checking whether or not the position information of the preformat information and the position information of the subcode match (whether or not there is a shift), the optical disc is stored on the optical disk at a storage density determined by the preformat information. It can be determined whether or not data has been written. If there is a difference between the position information of the preformat information and the position information of the subcode, it is determined that the data is written at a recording density different from the storage density determined by the preformat information, and the HF signal is determined. By reading data based on the data, the data recording position on the recording groove can be accurately grasped, and the data can be read normally.
[0017]
In addition, preformat information, which is represented by a wobble formed at a fixed wavelength in the recording groove and represents position information on the recording groove, is recorded in advance in the recording groove, and data to which a subcode including position information on the recording groove is added is recorded. Wobble CLV control means for controlling the rotation speed of an optical disc such that the cycle of the wobble read by rotating the optical disc becomes a predetermined cycle in an optical disc device for reading data written from an optical disc writable in a groove. HF signal CLV control means for controlling the rotation speed of the optical disc so that the cycle of the HF signal of the written data read by rotating the optical disc becomes the predetermined cycle, and the wobble CLV control Means for controlling the linear velocity of the optical disk rotated by the means and the HF signal CLV control means. A linear velocity determining means for determining whether the linear velocity of the optical disk rotated by the wobble CLV control means coincides with the linear velocity of the optical disk rotated by the wobble CLV control means; When it is determined that the linear velocity of the optical disk during rotation by the CLV control unit matches, the data of the optical disk is read based on preformat information and / or an HF signal, and the wobble CLV is read by the linear velocity determination unit. If it is determined that the linear velocity of the optical disk during rotation by the control means does not match the linear velocity of the optical disk during rotation by the HF signal CLV control means, the optical disk is read based on the HF signal read from the optical disk. Data reading means for reading out the data of And wherein the door.
According to this, by comparing the linear velocity of the optical disk when the CLV control is performed based on the wobble signal and the linear velocity when the CLV control is performed based on the HF signal, the cycle of the wobble matches the cycle of the HF signal. That is, it can be determined whether or not data is written on the optical disc at a storage density determined by the wavelength of the wobble (preformat information). If there is a difference between these linear velocities, it is determined that data is written at a storage density different from the storage density determined by the wavelength of the wobble (preformat information), and based on the HF signal. By reading data, the data recording position on the recording groove can be accurately grasped, and the data can be read normally.
[0018]
In addition, preformat information, which is represented by a wobble formed at a fixed wavelength in the recording groove and represents position information on the recording groove, is recorded in advance in the recording groove, and data to which a subcode including position information on the recording groove is added is recorded. In an optical disk drive for reading written data from an optical disk writable in a groove, a CAV control means for rotating the optical disk at a predetermined angular velocity, and a recording groove of the optical disk rotated at the predetermined angular velocity by the CAV control means Wobble cycle measuring means for measuring the cycle of the wobble at a predetermined position, and HF signal cycle for measuring the cycle of the HF signal at the predetermined position in the recording groove of the optical disc rotated at the predetermined angular velocity by the CAV control means Measuring means; and a circumference of the wobble measured by the wobble cycle measuring means. Signal period determining means for determining whether or not the period of the HF signal measured by the HF signal period measuring means matches; and the signal period determining means determines the wobble period and the HF signal period. Is determined to match, the data of the optical disc is read based on the preformat information and / or the HF signal, and the signal cycle determination means does not match the cycle of the wobble with the cycle of the HF signal. And a data reading means for reading data from the optical disk based on an HF signal read from the optical disk.
According to this, the cycle of the wobble signal and the cycle of the HF signal coincide with the cycle of the HF signal by comparing the cycle of the wobble signal and the cycle of the HF signal at a predetermined position on the recording groove in a state where the optical disc is subjected to the CAV control. Then, it can be determined whether data is written at a storage density determined by the wavelength of the wobble (preformat information). If there is a difference between the periods, it is determined that the data is written at a storage density different from the storage density determined by the wavelength of the wobble (preformat information), and the data is determined based on the HF signal. By reading the data, the data recording position on the recording groove can be accurately grasped, and the data can be read normally.
[0019]
In addition, a method for writing data on an optical disk according to the present invention includes the following configuration in order to solve the above-mentioned problems. That is, the recording density of data to be written is determined by preformat information represented by wobbles formed at a predetermined wavelength in a recording groove in advance. A wobble CLV control step of controlling a rotation speed of the optical disc such that a cycle of the wobble read by rotating the optical disc is a predetermined cycle; and the wobble is controlled by the wobble CLV control step. Writing data at a recording density different from the recording density determined by the preformat information by writing data at a recording cycle different from the data recording cycle determined from the predetermined cycle. Features That.
According to this, data is written on an optical disc rotating at a constant linear velocity at a cycle different from a recording cycle determined from a wobble cycle (cycle of a wobble signal), and therefore has a different recording capacity from that determined by preformat information. The capacity data can be written.
[0020]
Further, the data writing step includes writing data on the optical disc at a recording cycle shorter than a recording cycle of the data determined from the predetermined cycle of the wobble, so that the data density is higher than a recording density determined by the preformat information. Is written.
According to this, data having a larger capacity than the recording capacity determined by the preformat information can be written on the optical disc.
[0021]
Also, a method for reading an optical disk according to the present invention has the following configuration in order to solve the above problems. That is, the pre-format information indicating the position information on the recording groove is pre-recorded in the recording groove, and the data to which the subcode including the position information on the recording groove is added is read from the optical disk which can write the data into the recording groove. In the optical disk reading method, before reading data from the optical disk, position information represented by preformat information of a predetermined position of a recording groove of the optical disk and position information included in a subcode of the data at the predetermined position are read. Reading the position information of the preformat information and the position information of the subcode, and determining whether the position information of the subcode matches the position information of the subcode. If it is determined that the position information matches the pre-format information and And / or reading the data of the optical disk based on the HF signal, and when the position information determining step determines that the position information of the preformat information does not match the position information of the subcode, the data is read from the optical disk. Reading a data of the optical disk based on the read HF signal.
According to this, by checking whether or not the position information of the preformat information and the position information of the subcode match (whether or not there is a shift), the optical disc is stored on the optical disk at a storage density determined by the preformat information. It can be determined whether or not data has been written. If there is a difference between the position information of the preformat information and the position information of the subcode, it is determined that the data is written at a recording density different from the storage density determined by the preformat information, and the HF signal is determined. By reading data based on the data, the data recording position on the recording groove can be accurately grasped, and the data can be read normally.
[0022]
Also, preformat information that is expressed by a wobble formed at a constant wavelength in the recording groove and that represents position information on the recording groove is recorded in the recording groove in advance, and data to which a subcode including position information on the recording groove is added is recorded on the recording groove. A method for reading written data from an optical disk writable on the optical disk, a wobble CLV control for controlling a rotation speed of the optical disk so that a period of the wobble read by rotating the optical disk is a predetermined period. An HF signal CLV control step of controlling a rotation speed of the optical disc such that a cycle of an HF signal of the written data read by rotating the optical disc is the predetermined cycle, and the wobble CLV The linear velocity of the optical disk rotated by the control step; A linear velocity determining step for determining whether or not the linear velocity of the optical disk rotated by the F signal CLV control step is the same as the linear velocity of the optical disk during rotation by the wobble CLV control step; And the linear velocity of the optical disc during rotation by the HF signal CLV control step is determined to be the same, the data of the optical disc is read based on preformat information and / or the HF signal, and the linear velocity determining step is performed. When it is determined that the linear velocity of the optical disc during rotation by the wobble CLV control step does not match the linear velocity of the optical disc during rotation by the HF signal CLV control step, the HF signal read from the optical disc is determined. Based on the light Characterized in that it comprises a data reading step of reading disk data.
According to this, by comparing the linear velocities of the optical disc when the CLV control is performed based on the wobble signal and the linear velocity when the CLV control is performed based on the HF signal, the cycle of the wobble coincides with the cycle of the HF signal. That is, it can be determined whether or not data is written on the optical disc at a storage density determined by the wavelength of the wobble (preformat information). If there is a difference between these linear velocities, it is determined that data is written at a storage density different from the storage density determined by the wavelength of the wobble (preformat information), and based on the HF signal. By reading data, the data recording position on the recording groove can be accurately grasped, and the data can be read normally.
[0023]
Also, preformat information that is expressed by a wobble formed at a constant wavelength in the recording groove and that represents position information on the recording groove is recorded in the recording groove in advance, and data to which a subcode including position information on the recording groove is added is recorded on the recording groove. A method for reading data written from an optical disk writable on the optical disk, a CAV control step of rotating the optical disk at a predetermined angular velocity, and a predetermined position of a recording groove of the optical disk rotated by the CAV control step. A wobble cycle measuring step of measuring the cycle of the wobble, an HF signal cycle measuring step of measuring a cycle of an HF signal at the predetermined position of the recording groove of the optical disc rotated by the CAV control step, and the wobble cycle measuring step The period of the wobble measured by A signal cycle determining step for determining whether or not the cycle of the HF signal measured by the HF signal cycle measuring step matches; and the signal cycle determining step determines a cycle of the wobble and a cycle of the HF signal. If it is determined that they match, the optical disk data is read based on the preformat information and / or the HF signal, and the signal cycle determination step determines that the cycle of the wobble does not match the cycle of the HF signal. A data reading step of reading data from the optical disk based on an HF signal read from the optical disk.
According to this, the cycle of the wobble signal and the cycle of the HF signal coincide with each other by comparing the cycle of the wobble signal and the cycle of the HF signal at a predetermined position on the recording groove in a state where the optical disc is subjected to the CAV control. It can be determined whether or not data is written on the optical disc at a storage density determined by the wavelength of the wobble (preformat information). If there is a difference between the periods, it is determined that the data is written at a storage density different from the storage density determined by the wavelength of the wobble (preformat information), and the data is determined based on the HF signal. By reading the data, the data recording position on the recording groove can be accurately grasped, and the data can be read normally.
[0024]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, preferred embodiments of an optical disk, an optical disk device, an optical disk writing method, and an optical disk reading method according to the present invention will be described in detail with reference to the accompanying drawings.
[0025]
(First embodiment)
FIG. 1 is a block diagram illustrating a configuration of an optical disc device A according to the first embodiment.
The optical disk device A is communicably connected to a host computer H such as a personal computer. The optical disk device A does not necessarily need to be physically provided separately from the host computer H. For example, the optical disk device A is built in the housing of the host computer H, and is connected to the main board of the host computer H within the host computer H. It may be connected.
[0026]
The internal configuration of the optical disk device A will be described with reference to FIG. In FIG. 1, solid arrows indicate the flow of control, and broken arrows indicate the flow of data and signals.
The optical disk device A includes a disk holding unit 22 that holds an optical disk D on which data can be written, such as a CD-R, a CD-RW, a DVD-R, and a DVD-RW, and rotates the optical disk D via the disk holding unit 22. A hardware such as a spindle motor 24 for irradiating the optical disc D with a laser and a pickup 28 for reading a reflected light thereof is provided.
[0027]
Further, the optical disk device A has a control unit 1 including a CPU, a memory, a logic circuit, firmware, and the like. The control unit 1 includes a communication unit 2, a command analysis executing unit 4, a data reading unit 8, a position information determining unit 10, a data writing unit 12, a motor driver 26, a pickup driver 30, and a wobble CLV control unit 32.
[0028]
A motor driver 26 for controlling the drive of the spindle motor 24, a pickup driver 30 for controlling the position and laser irradiation of the pickup 28, and a wobble CLV control means 32 for performing the CLV control of the optical disc D via the motor driver 26 and the pickup driver 30. And a servo driver 18.
[0029]
The communication unit 2 is configured as a logic circuit and firmware having a function of receiving data transmitted from the host computer H and transmitting data in the optical disk device A to the host computer H.
[0030]
The command analysis execution unit 4 is configured as a firmware that analyzes the data string received by the communication unit 2, recognizes the data sequence as a command, and causes each unit in the control unit 1 to execute a predetermined process according to the type of the command. You. When the data to be transmitted to the host computer H is generated as a result of the processing performed by each unit, the command analysis executing unit 4 converts the data into a data string in a predetermined format and transmits the data through the communication unit 2. To the host computer H.
In the first embodiment, only two commands, a data write command and a data read command, are described as commands analyzed and executed by the command analysis and execution unit 4, but the types of commands are The present invention is not limited to this, and can be configured so that a larger number of commands can be analyzed.
[0031]
The data write command of the optical disk device A is a command for writing data on the optical disk D in a so-called disk-at-once manner. In the optical disc device A of the first embodiment, the data write command is configured to be able to specify the recording density of data on the optical disc D. The recording density is the number of recorded data (pits) with respect to the unit length of the recording groove. The data write command is used to determine how many times the data density (pit) is to be recorded with respect to the recording density determined by preformat information such as an ATIP address and an ADIP address previously recorded in the recording groove of the optical disc D. Can be specified. If a recording density that is one time as large as the recording density determined by the preformat information is designated, data can be recorded on the optical disc D at a predetermined recording density as in the related art.
The data read command is a command for instructing to read data written on the optical disc D.
[0032]
The data writing unit 12 is configured as firmware, and is activated by the command analysis execution unit 4 when the command analysis execution unit 4 analyzes the data write command.
The data writing means 12 writes the data specified by the data write command to the optical disc D via the servo driver 18 at the recording density specified by the data write command. This writing method will be described later.
[0033]
The position information determination unit 10 is configured as firmware, and is activated every time the optical disk D is inserted into the optical disk device A by the user and held by the disk holding unit 22.
The position information determining means 10 reads the preformat information and the subcode at a predetermined position of the recording groove of the optical disc D via the servo driver 18 and determines whether the position information (time information) included in each of the subcodes matches or shifts. Is determined. Further, in response to an inquiry from the data reading means 8 described later, the determination result is notified to the data reading means 8.
[0034]
The data reading unit 8 is configured as firmware, and is activated by the command analysis executing unit 4 when the command analysis executing unit 4 analyzes the data read command.
The data reading unit 8 reads data (track) on the optical disk D specified by the data reading command, and transmits the read data to the host computer H via the command analysis executing unit 4 and the communication unit 2. The method of reading data from the optical disc D differs depending on whether or not there is a difference between the position information of the preformat information and the position information of the subcode as a result of the inquiry to the position information determination unit 10. The method of reading this data will be described later.
[0035]
The wobble CLV control means 32 is configured as firmware, and performs CLV control of the optical disc D based on the wobble signal. That is, the wobble CLV control means 32 rotates the optical disc D via the motor driver 26 and the spindle motor 24, and controls the optical disc D so that the cycle of the wobble read via the pickup driver 30 and the pickup 28 becomes a predetermined cycle. Control the rotation speed of the.
In order to control the cycle of the wobble to be a predetermined cycle, a clock signal of the predetermined cycle is generated, and the cycle of the wobble signal is compared with the cycle of the clock signal. In other words, the rotational linear velocity of the optical disk D is increased, and if the wobble signal is shorter, the rotational linear velocity of the optical disk D is decreased, and control is performed so that the cycle of the wobble signal and the cycle of the clock signal match. If it is desired to change the predetermined cycle, the frequency of the clock signal may be changed by changing the frequency division ratio of the circuit that generates the clock signal.
[0036]
Next, an operation when the optical disk device A writes data to the optical disk D will be described.
[0037]
When the command analysis and execution unit 4 analyzes the data write command transmitted from the host computer H via the communication unit 2, the command analysis and execution unit 4 issues a data write command to the data write unit 12 and 12 is started.
[0038]
(Wobble CLV control step)
When activated by the data write command, the data write means 12 issues a CLV control command to the servo driver 18 at the standard linear speed of the optical disc (so-called 1x speed), as shown in step 1 of the flowchart of FIG. .
When receiving the CLV control command, the wobble CLV control means 32 of the servo driver 18 rotates the optical disk D via the motor driver 26, and changes the cycle of the wobble (cycle of the wobble signal) read via the pickup driver 30. The rotation speed of the optical disk D is controlled so as to have a predetermined cycle representing a standard linear velocity (so-called 1 × speed) (in the case of the present embodiment, the wobble signal frequency at the standard linear velocity is 22.05 kHz). Therefore, the predetermined period is (1 / 22.05 kHz) s = about 44.44 μs). That is, the wobble CLV control means 32 performs CLV control based on the wobble signal.
[0039]
(Data writing step)
Subsequently, as shown in step 2 of FIG. 2, the data writing means 4 designates a data recording cycle corresponding to the cycle (about 44.44 μs) of the wobble signal at the standard linear velocity of the optical disc D by a data write command. The data received from the host computer H via the communication unit 2 and the command analysis execution unit 4 is written to the optical disk D via the servo driver 18 at a recording cycle determined by dividing the data by a multiple of the recording density. For example, when the recording density is specified to be 1.25 times by the data write command, the recording signal of the recording period obtained by dividing the recording period at the standard linear velocity by 1.25 (that is, the frequency of 1.25 times) is obtained. Then, data is written to the optical disk D.
[0040]
As described above, data is written to the optical disc D rotating at the standard linear velocity by a write signal of a cycle obtained by dividing the standard recording cycle by the specified magnification (1.25) (that is, a frequency of 1.25 times the standard). Thus, data can be written on the optical disc D at a recording density of the designated magnification (1.25) times. That is, data can be written on the optical disc D at a density different from the recording density determined by the preformat information (1.25 times higher density). As a result, data having a larger capacity than the recording capacity determined by the preformat information can be written to the optical disc D.
[0041]
Of course, the specified magnification is not limited to 1.25, and any magnification can be specified.
If the designated magnification is 1, writing is performed at a standard recording cycle, and writing can be performed at a recording density similar to that of a conventional optical disk.
If the magnification is a positive number less than 1, the period of the recording signal is longer than the standard recording signal (that is, the recording signal frequency is higher), and data can be written at a lower density than the standard recording density. it can. In this case, although the recording capacity of the optical disc D is reduced, the pit density can be made lower than the standard recording density, so that the pits can be formed more reliably. It is possible to improve the recording quality and the reading quality of the optical disc D as compared with the standard, such as reducing misreading.
[0042]
In the wobble CLV control step, the optical disk D is rotated at a standard linear speed (so-called 1 × speed). However, the rotational linear speed of the optical disk D is not limited to 1 × speed, and may be, for example, 2 × speed, 4 × speed, 8 × speed.・ ・ It may be rotated at any speed, such as. In this case, the cycle of the wobble signal is 1/2 times, 1/4 times, 1/8 times... Accordingly, and therefore the data recording cycle is also divided by the designated magnification (for example, 1.25). Above, the frequency may be set to 1/2, 1/4, 1/8, ... (that is, the frequency of the recording signal is 2, 4, 8, ...) according to the cycle of the wobble signal.
[0043]
The data writing means 4 of the optical disk apparatus A and the optical disk writing method employ a method in which the optical disk D is rotated at a standard linear velocity and the period of the recording signal is changed in accordance with the specified magnification of the data write command. However, the data writing means 4 and the optical disk writing method of the optical disk apparatus A according to the present invention are not limited thereto, and the cycle of the wobble signal differs from the data recording cycle determined from the cycle. Includes all that write data to the optical disc D in the recording cycle.
[0044]
For example, in the processing of the data writing means 4 shown in the flowchart of FIG. 3, in step 11 (wobble CLV control step), the rotation speed of the optical disk D is set to the linear speed obtained by dividing the standard linear speed by the specified magnification, and the following step 12 In the (data writing step), data may be written in a data recording cycle determined from the cycle of the wobble signal when the optical disc D is rotated at the standard linear velocity. According to this, when the specified magnification is 1.25, the rotational linear velocity of the optical disk D is reduced to 1/125 times (= 0.8 times), and the writing is performed at the period of the standard time recording signal. Therefore, data can be written at a density 1.25 times higher than the standard.
In order to increase the rotational linear velocity of the optical disc D to, for example, 0.8 times, the frequency division ratio of the clock signal to be compared with the cycle of the wobble signal is changed, and the cycle of the clock signal is changed to the wobble signal at the standard linear velocity. It may be 1.25 times the signal period (about 44.44 μs).
[0045]
Here, the optical disc D on which data is written at a high density (or low density) by the optical disc apparatus A (optical disc writing method) according to the present invention ignores the preformat information expressed by the wavelength of the wobble. Since the data has been written, the data is recorded such that the position information represented by the preformat information and the position information included in the subcode are shifted by a predetermined ratio. FIG. 4 shows the position information and the subcode of the preformat information on the recording groove of the optical disk D on which data is written at a density of 1.25 times the standard by the optical disk apparatus A (optical disk writing method) according to the present invention. 2 schematically shows the relationship between the two recording positions of the position information. As described above, in the optical disk D on which data is written by the optical disk device A (optical disk writing method) according to the present invention, the position information of the preformat information and the position information of the subcode do not match at the same position on the recording groove. , At a predetermined rate.
[0046]
Conventionally, in an optical disk reading method for reading written data from a writable optical disk such as a CD-R or a CD-RW, a position of the written data on a recording groove is recognized based on preformat information. Then, the data is read.
[0047]
However, as described above, the optical disc D on which data has been written at high density (or low density) by the optical disc apparatus A (optical disc writing method) according to the present invention has the preformat information position information and the subcode position information. In the conventional read method for recognizing the data position based on the preformat information, the data cannot be read, or when the pickup position jumps based on the preformat information, the position of the jump destination and the jump destination position do not match. However, there is a problem that the error from the position of the data to be read is large, and it takes time to move the pickup to the data to be read based on the position information of the subcode after the jump.
Therefore, an optical disk reading method capable of normally and quickly reading data from an optical disk D on which data has been written at high density (or low density) by the optical disk apparatus A (optical disk writing method) according to the present invention is described. The operation will be described below along with the operation when the optical disk device A reads data from the optical disk D.
[0048]
(Position information determination step)
As shown in the flowchart of FIG. 5, when the optical disk D is inserted into the optical disk device A and held by the disk holding unit 22, the position information determining unit 10 is activated. The position information judging means 10 reads out the preformat information and the subcode at a predetermined position on the recording groove of the optical disc D, for example, the middle point of the entire recording groove via the servo driver 18 (step 21). Subsequently, the position information of the preformat information at the predetermined position is compared with the position information of the subcode, and the determination result, that is, the match / mismatch is stored in a storage device such as a RAM (step 22).
[0049]
Thereafter, the optical disk device A enters a command standby state in which a command can be received from the host computer H.
In the command waiting state of the optical disk device A, when a data read command is transmitted from the host computer H via the communication unit 2 and the command analysis execution means 4 analyzes the data read command, the command analysis execution means 4 Then, a data read command is issued to the data read means 8 to activate the data read means 8.
[0050]
(Data reading step)
When activated by the data read command, the data reading means 8 sends the position information of the preformat information of the optical disc D and the subcode of the subcode to the position information determining means 10 as shown in step 31 of the flowchart of FIG. Inquires whether the position information matches or does not match. The position information judging means 10 notifies the data reading means 8 of the coincidence / mismatch based on the judgment result stored in the storage means. The data reading means 8 compares the two pieces of position information (step 32), and if the two pieces of position information match, determines that the data on the optical disk D has been written at the recording density determined by the preformat information. Then, data is read out based on the position information of the preformat information (the HF signal may be used together) (step 33). On the other hand, if the two pieces of position information do not match, it is determined that the data on the optical disc D is written at a recording density different from the recording density determined by the preformat information, and the HF signal read from the optical disc is read. Is read out based on the data (step 34).
Subsequently, the data reading unit 8 transmits the read data to the host computer H via the command analysis executing unit 4 and the communication unit 2 (Step 35).
[0051]
The HF signal is a signal that is directly read from the written data (pits), regardless of the preformat information. Therefore, by reading the data based on the HF signal, the written data can be read normally. . Therefore, by writing data at a recording density different from the recording density determined by the preformat information, the data on the optical disc D in which the position information of the preformat information and the position information of the subcode do not match at the same location on the recording groove. However, if the data is read based on the HF signal without referring to the preformat information, the data cannot be read, or it takes time to move the pickup to the data to be read after the jump of the pickup based on the preformat information. Such a problem does not occur.
[0052]
In the first embodiment, in order to determine whether data is written on the optical disc D inserted in the optical disc apparatus A at a recording density different from the recording density determined by the preformat information, Although the position information determination means 10 (position information determination step) described in claim 6 (claim 11) of the present application is employed, the determination can be made by another means (method).
As another means (method), the means (method) described in claims 7 and 12 or claims 8 and 13 of the present application can be adopted. Hereinafter, the second and third embodiments employing these means (methods) will be described. In the second and third embodiments, the same components as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.
[0053]
(Second embodiment)
A second embodiment corresponding to the invention described in claims 7 and 12 of the present application will be described.
As shown in FIG. 7, in the optical disk device B according to the second embodiment, in addition to the configuration of the optical disk device A according to the first embodiment, the optical disk D is rotated in the servo driver 18. An HF signal CLV control unit 33 that controls the rotation speed of the optical disc D is provided so that the cycle of the HF signal of the data read and written on the optical disc D is constant. Further, instead of the position information judging means 10, the wobble CLV control means 32 controls the linear velocity of the optical disc D when the rotation is controlled so that the wobble cycle becomes a predetermined cycle, and the HF signal CLV control means 33 outputs the HF signal. A linear velocity determining means 14 for determining whether or not the linear velocity of the optical disk D when the rotation control is performed so that the cycle of the optical disc D coincides with the predetermined cycle. The data reading means 8 inquires of the linear velocity determining means 14 whether or not the two linear velocities match. If not, the data is read based on the HF signal.
[0054]
In the method of reading data by the optical disk device B, when the optical disk D is inserted, the wobble CLV control means 32 is activated and the optical disk D is CLV controlled so that the wobble signal has a predetermined cycle (wobble signal CLV control). Steps). Further, the HF signal CLV control means 33 is activated, and the optical disc D is CLV controlled so that the HF signal coincides with the predetermined period (HF signal CLV control step). Note that the wobble signal CLV control step and the HF signal CLV control step only need to have the same predetermined cycle in both cases, and the time series relationship between the two processes may be reversed. Subsequently, the linear velocity determining unit 14 determines whether the two linear velocities in both CLV controls match (linear velocity determining step), and stores the determination result in a storage unit such as a RAM.
After that, when the optical disk device B receives the data read command and the data read means 8 is started, the data read means 8 inquires the linear velocity determining means 14 about the determination result. If they do not match based on the preformat information (the HF signal may be used together), the data is read based on the HF signal.
[0055]
When the optical disk D is rotated at the same linear velocity, in a conventional optical disk in which data written on the optical disk D is written at a recording density determined by preformat information expressed by the wavelength of the wobble, a wobble signal and On the other hand, in the optical disc D of the present invention in which data is written ignoring preformat information (wavelength of wobble), the period of the HF signal does not match the period of the HF signal. Therefore, when CLV control is performed so that the cycle of the wobble signal and the cycle of the HF signal are the same, it is determined whether or not the linear velocities of the two are coincident with each other. It is possible to determine whether or not the data is written at the recording density determined by the information (wobble).
[0056]
(Third embodiment)
A third embodiment corresponding to the invention described in claims 8 and 13 of the present application will be described.
As shown in FIG. 8, in the optical disk device C according to the third embodiment, in addition to the configuration of the optical disk device A according to the first embodiment, a predetermined number of optical disks D CAV control means 34 for controlling the rotation at a constant angular velocity of the optical disk D. The CAV control means 34 measures the cycle of the wobble signal at a predetermined position of the recording groove of the optical disc D rotated at a predetermined angular velocity, and stores the cycle in a RAM or the like. The wobble cycle measuring means 36 stored in the means and the CAV control means 34 measure the cycle of the HF signal at the same position as the predetermined position of the recording groove of the optical disc D rotated at the same angular velocity as the predetermined angular velocity, and HF signal cycle measuring means 37 for storing the cycle in a storage means such as a RAM. Further, instead of the position information determining means 10, it is determined whether or not the wobble cycle measured by the wobble cycle measuring means 36 and the cycle of the HF signal measured by the HF signal cycle measuring means 37 match. The signal period determining means 16 is provided. The data reading means 8 inquires of the signal cycle determining means 16 whether or not the two cycles match, and if they match, the two match based on the preformat information (the HF signal may be used together). If not, the data is read based on the HF signal.
[0057]
In the data reading method by the optical disk device C, when the optical disk D is inserted, the CAV control means 34 is activated to perform the CAV control on the optical disk D at a constant angular velocity (CAV control step). Subsequently, the wobble cycle measuring means 36 is activated, the cycle of the wobble signal at a predetermined position of the recording groove of the optical disc D is measured (wobble cycle measuring step), and the cycle of the measurement result is stored in the storage means. Subsequently, the HF signal cycle measuring means 37 is activated to measure the cycle of the HF signal at the same position as the predetermined position of the recording groove of the optical disc D (HF signal cycle measuring step), and to store the cycle of the measurement result. Remember. Note that the wobble cycle measurement step and the HF signal cycle measurement step may be performed if the angular velocity of the optical disc D by the CAV control means 34 and the predetermined position are common to both, and the time-series relationship of the processing may be reversed. Absent. Subsequently, the signal cycle determining means 16 determines whether the cycle of the wobble stored in the storage means matches the cycle of the HF signal (signal cycle determining step), and stores the determination result in a storage means such as a RAM. Remember.
Thereafter, when the optical disk device C receives the data read command and the data read means 8 is activated, the data read means 8 inquires of the signal cycle determination means 16 for the determination result. If they do not match based on the preformat information (the HF signal may be used together), the data is read based on the HF signal.
[0058]
When the optical disc D is rotated at the same angular velocity, in a conventional optical disc in which data written on the optical disc D is written at a recording density determined by preformat information expressed by a wobble wavelength, a wobble signal and an HF In the optical disc D of the present invention in which the signal periods match and data is written ignoring the preformat information (wobble wavelength), the periods of the wobble signal and the HF signal do not match. Therefore, when the CAV control is performed so that the cycle of the wobble signal and the cycle of the HF signal are the same, by judging whether or not the two cycles coincide with each other, the recording density of the data written on the optical disc D can be changed to the preformat information. It can be determined whether or not the data is written at the recording density determined by (wobble).
[0059]
Although the optical disk devices A to C according to the first to third embodiments are connected to the host computer H, the present invention is not limited to this, and the present invention is not limited to this. An optical disk device that operates alone, such as an -R recorder or a DVD player for video reproduction, is also included. In this case, the data read command and the data write command may be replaced with operations such as a play button and a record button.
[0060]
【The invention's effect】
ADVANTAGE OF THE INVENTION According to the optical disk, the optical disk device, the optical disk writing method, and the optical disk reading method according to the present invention, it is possible to write data having a larger storage capacity than the storage capacity defined for the optical disk, and it is preferable to write data from the optical disk. This has the effect that the data can be read out to the user.
[Brief description of the drawings]
FIG. 1 is a block diagram illustrating an internal configuration of an optical disc device according to a first embodiment.
FIG. 2 is a flowchart illustrating processing of a data writing unit.
FIG. 3 is a flowchart illustrating a process (another example) of a data writing unit.
FIG. 4 is an explanatory diagram showing the relationship between the position information of preformat information and the position of recording subcode position information on a recording groove of an optical disk on which data is written at a higher density than a standard.
FIG. 5 is a flowchart illustrating a process of a position information determining unit.
FIG. 6 is a flowchart illustrating a process of a data reading unit.
FIG. 7 is a block diagram illustrating an internal configuration of an optical disc device according to a second embodiment.
FIG. 8 is a block diagram illustrating an internal configuration of an optical disc device according to a third embodiment.
FIG. 9 is an explanatory diagram showing a wobble formed in a recording groove.
[Explanation of symbols]
A, B, C optical disk device
D optical disk
H Host computer
1 control unit
2 Communication unit
4 Command analysis execution means
8 Data reading means
10 Position information determination means
12 Data writing means
14 Linear velocity judgment means
16 Signal period determination means
18 Servo driver
22 Disk holding means
24 spindle motor
26 Motor driver
28 Pickup
30 Pickup driver
32 Wobble CLV control means
33 HF signal CLV control means
34 CAV control means
36 Wobble period measuring means
37 HF signal period measuring means

Claims (13)

A recording density of data to be written is determined by preformat information pre-recorded in a recording groove.
An optical disc on which data is written at a recording density different from the recording density determined by the preformat information. 2. The optical disk according to claim 1, wherein a recording density of the data is higher than a recording density determined by the preformat information. In the optical disk device for writing data to an optical disk capable of writing data, the recording density of data to be written is determined by preformat information pre-recorded in a recording groove.
An optical disc device comprising: a data writing unit that writes data to the optical disc at a recording density different from the recording density determined by the preformat information. The preformat information is represented by a wobble formed at a constant wavelength in a recording groove,
Wobble CLV control means for controlling a rotation speed of the optical disc such that a cycle of the wobble read by rotating the optical disc is a predetermined cycle,
The data writing means writes data to the optical disc, the rotation of which is controlled by the wobble CLV control means, at a recording cycle different from a data recording cycle determined from the predetermined cycle of the wobble, thereby obtaining the preformat information. 4. The optical disc device according to claim 3, wherein data is written at a recording density different from the recording density determined by the following. The data writing unit writes data at a higher recording density than the recording density defined by the preformat information by writing data to the optical disc at a recording cycle shorter than a data recording cycle determined from the predetermined cycle of the wobble. The optical disk device according to claim 4, wherein: An optical disc device that reads out written data from an optical disc in which preformat information representing position information on a recording groove is prerecorded in the recording groove and data to which a subcode including the position information on the recording groove is added can be written in the recording groove. At
Before reading data from the optical disc, position information represented by preformat information at a predetermined position of a recording groove of the optical disc and position information included in a subcode of the data at the predetermined position are read, and the preformat information is read. Position information determining means for determining whether or not the position information of the sub-code matches the position information of the sub-code,
When the position information determining means determines that the position information of the preformat information and the position information of the subcode match, the data of the optical disc is read based on the preformat information and / or the HF signal, If the position information determining means determines that the position information of the preformat information does not match the position information of the subcode, the data to be read from the optical disk based on the HF signal read from the optical disk. An optical disk device comprising: a reading unit. Preformat information, which is represented by a wobble formed at a constant wavelength in the recording groove and indicates position information on the recording groove, is recorded in advance in the recording groove, and data with a subcode including position information on the recording groove is added to the recording groove. In an optical disk device for reading written data from a writable optical disk,
Wobble CLV control means for controlling the rotation speed of the optical disc such that the cycle of the wobble read by rotating the optical disc is a predetermined cycle;
HF signal CLV control means for controlling the rotation speed of the optical disc so that the cycle of the HF signal of the written data read by rotating the optical disc is the predetermined cycle,
Linear velocity determining means for determining whether the linear velocity of the optical disk rotated by the wobble CLV control means matches the linear velocity of the optical disk rotated by the HF signal CLV control means,
If the linear velocity determining means determines that the linear velocity of the optical disk during rotation by the wobble CLV control means matches the linear velocity of the optical disk during rotation by the HF signal CLV control means, the preformat information And / or reading the data of the optical disc based on the HF signal, and determining the linear velocity of the optical disc during rotation by the wobble CLV control means and the linear velocity of the optical disc during rotation by the HF signal CLV control means. An optical disc apparatus comprising: a data reading unit that reads data from the optical disc based on an HF signal read from the optical disc when it is determined that the speeds do not match. Preformat information, which is represented by a wobble formed at a constant wavelength in the recording groove and indicates position information on the recording groove, is recorded in advance in the recording groove, and data with a subcode including position information on the recording groove is added to the recording groove. In an optical disk device for reading written data from a writable optical disk,
CAV control means for rotating the optical disc at a predetermined angular velocity;
Wobble cycle measuring means for measuring a cycle of the wobble at a predetermined position of a recording groove of the optical disc rotated at the predetermined angular velocity by the CAV control means;
HF signal cycle measurement means for measuring a cycle of an HF signal at the predetermined position of the recording groove of the optical disc rotated at the predetermined angular velocity by the CAV control means;
Signal cycle determining means for determining whether the cycle of the wobble measured by the wobble cycle measuring means matches the cycle of the HF signal measured by the HF signal cycle measuring means,
If the signal cycle determination means determines that the cycle of the wobble matches the cycle of the HF signal, the data of the optical disc is read based on preformat information and / or the HF signal, and the signal cycle determination is performed. When the means determines that the cycle of the wobble does not match the cycle of the HF signal, the data reading means reads data of the optical disc based on the HF signal read from the optical disc. Optical disk device. According to a pre-format information expressed by a wobble formed at a predetermined wavelength in a recording groove in advance, a recording density of data to be written is determined.
A wobble CLV control step of controlling a rotation speed of the optical disc such that a cycle of the wobble read by rotating the optical disc is a predetermined cycle;
By writing data to the optical disc whose rotation is controlled by the wobble CLV control step at a recording cycle different from a data recording cycle determined from the predetermined cycle of the wobble, the recording determined by the preformat information is performed. A data writing step of writing data at a recording density different from the density. In the data writing step, data is written on the optical disc at a recording cycle shorter than a data recording cycle determined from the predetermined cycle of the wobble, thereby writing data at a higher density than a recording density defined by the preformat information. The method for writing an optical disc according to claim 9, wherein: The preformat information indicating the position information on the recording groove is pre-recorded in the recording groove, and the data to which the subcode including the position information on the recording groove is added can be written on the recording groove from the optical disk that can read the written data. In the reading method,
Before reading data from the optical disc, position information represented by preformat information at a predetermined position of a recording groove of the optical disc and position information included in a subcode of the data at the predetermined position are read, and the preformat information is read. Position information determining step of determining whether or not the position information of the sub-code matches the position information of the sub-code,
When it is determined by the position information determining step that the position information of the preformat information matches the position information of the subcode, the data of the optical disc is read based on the preformat information and / or the HF signal, When the position information determination step determines that the position information of the preformat information does not match the position information of the subcode, the data to be read from the optical disk based on the HF signal read from the optical disk. A method for reading an optical disk, comprising: a reading step. Preformat information, which is represented by a wobble formed at a fixed wavelength in the recording groove and indicates position information on the recording groove, is pre-recorded in the recording groove, and data with a subcode including position information on the recording groove is written in the recording groove. In a method for reading an optical disk from which written data is read from a possible optical disk,
A wobble CLV control step of controlling a rotation speed of the optical disc such that a cycle of the wobble read by rotating the optical disc is a predetermined cycle;
An HF signal CLV control step of controlling a rotation speed of the optical disc such that a cycle of an HF signal of the written data read by rotating the optical disc is the predetermined cycle;
A linear velocity determining step of determining whether the linear velocity of the optical disk rotated by the wobble CLV control step matches the linear velocity of the optical disk rotated by the HF signal CLV control step;
If the linear velocity determining step determines that the linear velocity of the optical disk during rotation by the wobble CLV control step matches the linear velocity of the optical disk during rotation by the HF signal CLV control step, the preformat information And / or reading out the data of the optical disk based on the HF signal, and determining the linear velocity of the optical disk during rotation by the wobble CLV control step and the linear velocity of the optical disk during rotation by the HF signal CLV control step by the linear velocity determining step. A data reading step of reading data from the optical disk based on an HF signal read from the optical disk when it is determined that the speeds do not match. Preformat information, which is represented by a wobble formed at a fixed wavelength in the recording groove and indicates position information on the recording groove, is pre-recorded in the recording groove, and data with a subcode including position information on the recording groove is written in the recording groove. In a method for reading an optical disk from which written data is read from a possible optical disk,
A CAV control step of rotating the optical disc at a predetermined angular velocity;
A wobble cycle measuring step of measuring a cycle of the wobble at a predetermined position of a recording groove of the optical disc rotated by the CAV control step;
An HF signal cycle measuring step of measuring a cycle of the HF signal at the predetermined position of the recording groove of the optical disc rotated by the CAV control step;
A signal cycle determining step of determining whether a cycle of the wobble measured by the wobble cycle measuring step matches a cycle of the HF signal measured by the HF signal cycle measuring step;
When it is determined in the signal cycle determining step that the cycle of the wobble matches the cycle of the HF signal, the data of the optical disc is read based on preformat information and / or the HF signal, and the signal cycle determination is performed. A data reading step of reading data from the optical disk based on an HF signal read from the optical disk when it is determined by the step that the period of the wobble does not match the period of the HF signal. Method for reading an optical disk.

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