KR100604887B1 - Optical recorder - Google Patents

Abstract

An object of the present invention is to provide an optical recording device having a short recording time by varying the zone layout with a simple configuration.

An optical recording apparatus for dividing a recording area of an optical disc into several zones and recording signals with a constant linear velocity for each zone, comprising: a linear velocity measuring means for measuring the linear velocity of the optical disk, and a track pitch of the optical disk. A variable means for varying the start physical address and the end physical address of each zone based on the track pitch measurement means to be measured, and the track pitch measured by the linear velocity measurement means and the track pitch measured by the track pitch measurement means. An optical recording apparatus having a short recording time can be provided by varying the zone layout.

Description

Optical recorder

1 is a configuration diagram of an optical recording apparatus according to the present embodiment.

2 is a diagram showing a relationship between a zone layout and a linear velocity according to the present embodiment.

3 is a specific example of the zone layout according to the present embodiment.

4 is a diagram showing a relationship between a zone layout and a linear velocity according to the prior art.

[Short description of symbols]

One… Optical disc

2… Optical pickup

3... Servo circuit

4… Signal processing circuit

5... A / D

6... D / A

7... ACT driver

8… Encoder

9... Physical address decoder

10... Spindle control circuit

11... Spindle motor

12... CPU

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an optical disc having a CLV recording format having a substantially constant recording density on the front surface of the disc, and more particularly, to an optical recording apparatus for recording information by zone CLV (Constant Linear Velocity).

Conventionally, compared to an optical disc having a CLV recording format in which the recording density on the front of the disc is almost constant, the recording area of the optical disc is divided into a plurality of zones on the donuts in the radial direction, and data is stored at a constant rotational speed in each zone. The recording method of zone CLV for recording / reproducing is known. According to this zone CLV method, since the outer zone and the recording speed are set quickly, and the data recording speed in each zone is constant, it is different from the CLV method in which the recording speed is constant over the entire recording area. Different and substantial recording time can be shortened.

In this zone CLV method, the layout of each zone is determined based on the physical address PBA (PBA), but on one side, a standard for recording optical discs of CD systems such as CD-R and CD-RW is used. Optical discs having various linear velocities or track pitches within this range are commercially available. Until now, it has been common to record on such optical discs using the zone CLV method in a common zone layout based on the physical address. (For example, Japanese Patent Laid-Open No. 2001-067797 (paragraphs 2 to 6, FIG. 2))

By the way, as described above, when the recording operation by the zone CLV method is constantly performed on the basis of the physical address for all the optical disks, for example, due to the reduction of power consumption, heat generation, or rotational noise of the optical disk, In the case where the maximum rotational speed of the spindle motor for rotating the optical disk is controlled to a certain value or less, it is necessary to determine the zone layout based on the disk having the fastest linear speed and the wide track pitch among the optical disks in the specification. In addition, since the linear speed of the CD system is allowed in a wide range from 1.2 m / s to 1.4 m / s in the specification, when the zone layout is performed as described above, the optical disk has a low linear speed and a narrow track pitch. With respect to the recording operation, as shown in Fig. 4, the spindle motor is controlled at a low rotational speed with respect to the prescribed rotational speed of the spindle motor, and the recording speed is relatively slow, that is, the recording time is long. There was.

Accordingly, the present invention has been made in view of the above-described problems, and an object thereof is to provide an optical recording device having a short recording time by varying the zone layout with a simple configuration.

MEANS TO SOLVE THE PROBLEM In order to solve the said subject, this invention proposes the following means.

      The invention according to claim 1 is an optical recording apparatus for dividing a recording area of an optical disc into several zones and recording signals at a constant linear velocity for each zone, comprising: linear speed measuring means for measuring the linear velocity of the optical disc; The start physical address and end of each zone based on the track pitch measuring means for measuring the track pitch of the optical disc, the linear velocity measured by the linear velocity measuring means and the track pitch measured by the track pitch measuring means. There is proposed an optical recording apparatus having variable means for varying physical addresses.

According to this invention, since the variable means varies the start physical address and the end physical address of each zone based on the measured linear velocity and track pitch, the recording time can be shortened for various optical discs.

The invention according to claim 2 has a storage means for storing the starting physical address of each zone corresponding to the reference linear speed with respect to the optical recording device according to claim 1, wherein the variable means measures the linear speed. When the linear velocity measured by the means is later than the reference value of the linear velocity, the starting physical address of each zone is changed to the inner circumference of the optical disc than the starting physical address stored in the storage means, and the measured linear velocity is the reference value of the linear velocity. When it is faster, the optical recording apparatus has been proposed, wherein the start physical address of each zone is changed to the outer peripheral side of the optical disc rather than the start physical address stored in the storage means.

According to the present invention, the variable means is adapted to change the starting physical address of each zone to the inner circumference of the optical disc when the measured physical velocity is later than the reference value, and the measured linear velocity is faster than the reference value. Since the starting physical address is changed to the outer circumference of the optical disk rather than the stored starting physical address, the zone on each optical disk can be optimized in view of the recording speed.                         

The invention according to claim 3, wherein the optical recording device according to claim 1 or 2 has a motor for rotating the optical disk, and the change of the start physical address of each zone by the variable means causes the linear velocity measurement. On the basis of the linear velocity measured by the means and the track pitch measured by the track pitch measurement means, there is proposed an optical recording device characterized in that it is executed in a range not exceeding the limit rotational speed of the motor in each zone.

      According to this invention, since the change of the start physical address of each zone by the variable means is performed in the range which does not exceed the limit rotation speed of the spindle motor in each zone, even if there is a difference in the original linear velocity, it is suitable for each optical disc. Zones can be formed.

      The invention according to claim 4, wherein the track pitch measuring means calculates a track pitch based on the maximum recordable physical address of the optical disc, with respect to the optical recording device according to claim 1. I'm proposing.

According to the present invention, since the track pitch measuring means calculates the track pitch based on the maximum recordable physical address of the optical disk, it is possible to easily grasp the track pitch of each optical disk without adding any special hardware.

      Hereinafter, an optical recording apparatus according to an embodiment of the present invention will be described in detail with reference to FIGS.

      As shown in FIG. 1, the optical recording apparatus according to the embodiment of the present invention includes an optical disc 1, an optical pickup 2, a servo circuit 3, a signal processing circuit 4, and an A / D. (A / D: Analog

 Digital Converter (5), D / A (D / A: Digital Analog Converter, 6), ACT Driver (ACT: Actuator, 7), Encoder (8), Physical Address Decoder (9), Spindle Control A circuit 10, a spindle motor 11, and a CPU (CPU: Central Processing Unit, 12) are provided.

      In the optical disc 1, a data area is formed between a lead-in area provided in the innermost part and a lead-out area provided in the outermost part. The data area is divided into zones on the donuts, but in this embodiment, the start physical address and the end physical address of each zone are varied by the linear velocity and track pitch of each optical disc 1. Each zone on the optical disc performs a recording operation at different recording speeds, and a recording operation is performed at the same recording speed in one zone.

      The optical pickup 2 is an optical component such as an objective lens, a polarizing beam splitter, a cylindrical lens driven by a laser diode or a collimating lens, a focus actuator or a tracking actuator, which is not shown, and A, which will be described later. It is divided into four areas of B, C, and D, and includes a four- or two-split photodetector PD for converting light into an electrical signal, and a front monitor diode for monitoring laser output during recording and reproduction.

      The servo circuit 3 generates an RF signal indicating the total amount of reflected light in each area of the four-part photodetector in the optical pickup 2, and generates a binary EFM signal from the RF signal. A signal for generating a focus error signal FE, which is a signal for detecting a phenomenon out of focus of the irradiation laser of the optical pickup 2 by astigmatism, and also detecting a track shift of the irradiation laser of the optical pickup 2; The in tracking error signal TE is generated by the push-pull method or the like. Further, based on the generated FE and TE, the focus drive signal FODRV and the tracking drive signal TRDRV are generated and supplied to the ACT driver 7.

      The signal processing circuit 4 inputs an EFM signal, performs data recovery processing, outputs the signal to D / A6, modulates a signal input from A / D5, and supplies the optical pickup to the optical pickup 2. The recording operation. In addition, a PLL circuit (not shown) is provided to generate a control signal of the spindle motor 11. A / D5 is a circuit block for converting an analog signal input from the outside into a digital signal, and D / A6 is a circuit block for converting a digital signal demodulated by the signal processing circuit 4 into an analog signal.

      The ACT driver 7 amplifies the focus drive signal FODRV and tracking drive signal TRDRV input from the servo circuit 3, and supplies this to the focus actuator or tracking actuator in the optical pickup 2 to perform desired control. It is a driving circuit. The encoder 8 drives the carriage unit from the outside by supplying a pulse signal to a carriage unit on which an optical pickup 2 not shown is shown. In this embodiment, the encoder 8 contributes to the measurement by the track pitch of the optical disc 1. .

      The physical address decoder 9 receives a signal read by the optical pickup 2 through the servo circuit 3, and detects physical address information recorded on the optical disc 1 in advance from now on. The spindle control circuit 10 identifies the zone where the optical pickup 2 is located based on the detection timing or value of this physical address, and rotates the spindle motor 11 at a predetermined rotation speed for each zone of the optical disc 1. To control. The CPU 12 executes the control of the entire optical recording device in accordance with the control program.

      Next, the operation of this embodiment will be described with reference to FIGS. 1 to 3.

      When the optical disc 1 is inserted into the optical recording apparatus, the CPU 12 first performs the setup operation, and closes each servo to measure the linear velocity of the inserted optical disc 1. There are several methods for measuring the linear velocity. For example, the following is performed.

      In general, when the linear velocity of the optical disc 1 is different, the prerecording density is also different, so that the physical intervals of the synchronization signals appearing at regular intervals from the optical disc 1 also differ. In the CLV control, the rotation speed of the optical disc 1 is controlled so that the synchronization signal obtained from the optical disc 1 is at a fixed time interval, so that the difference in the linear speed of the optical disc 1 is determined by the difference in the rotation speed of the optical disc 1. appear. Therefore, after confirming the CLV control lock, the optical pickup 2 is seeked at the innermost circumference of the user area, and the one rotation time of the optical disc 1 is measured by the internal timer of the CPU 12.

      Further, one rotation of the optical disc 1 can be obtained by counting the FG pulses input by the CPU 12 from the spindle control circuit 10. The faster the linear speed of the optical disc 1 is, the faster the rotation speed of the optical disc 1 becomes, and accordingly, the time for which the optical disc 1 rotates by one time is shorter. You can get the speed.

      When the linear velocity of the optical disc 1 is obtained, the encoder 8 then supplies a pulse signal corresponding to a prescribed count value to a carriage unit (not shown) to move the optical pickup 2 in the circumferential direction of the optical disc 1. In this case, a change in the physical address is requested. Then, the track pitch of the optical disc 1 is obtained from the change value of the obtained physical address and the linear speed obtained first, and this value is stored in the storage device in the CPU 12 together with the linear speed value.

      The track pitch measurement may be obtained from the maximum recordable physical address of the optical disc 1, rather than the method described above. This is because in the actual optical disc, the maximum recordable physical address is almost equal to the recording capacity, and there is a close relationship between the recording capacity and the track pitch. For example, a track pitch is about 1.6 micrometers for a CD-R 74-minute disc and a track pitch about 1.4 micrometers for a disc longer than 90 minutes.

      The starting physical address of each zone of the optical disc 1 is calculated by calculation in a range in which the rotation speed of the spindle motor 11 in each zone does not exceed the limit rotation speed of the spindle motor based on the linear velocity and track pitch obtained above. Is saved. That is, as in the conventional case, when the zone layout is performed on the basis of the optical disc 1 having the fastest linear speed and the wide track pitch, as shown in Fig. 4, for example, the spindle has a low linear speed in the spindle. The zone is changed before the rotation speed of the motor 11 reaches the limit rotation speed, and the recording time is relatively long.

      However, as shown in Fig. 2, for example, the reference value of the linear velocity is 1.3 m / s, and for each optical disc 1 having a linear velocity slower than this, the angle of the optical disc 1 at the linear velocity as a reference is given. It is possible to optimize the zone layout for each optical disc by making the start physical address slower than the start physical address of the zone and making the start physical address slower for the optical disc 1 which is faster than the reference linear speed. In addition, the track pitch also becomes a factor in determining the start physical address of each zone in the actual optical disc 1.

      Fig. 3 is a specific example in the case where the maximum rotational speed of the optical disc is set to 2200 rpm and the recording area of the optical disc is set to three zones of 4x speed, 6x speed, and 8x speed. In the figure, the solid line shows the zone layout and the rotation speed of the spindle motor when the linear disk speed is 1.4 m / s, and the dotted line shows the zone layout and the rotation of the spindle motor when the linear disk speed is 1.2 m / s. The trend of numbers is shown.

      According to this, in the zone area of the 4x speed, when the linear speed of the optical disc is 1.4 m / s, the physical address is from 0 to 74010, and the minimum rotational speed of the spindle motor at this time is 1470 rpm, and the linear speed of the optical disc is In the case of 1.2 m / s, the physical addresses are from 0 to 43413.

      The zone area at 6x speed has a physical address of 74010 to 182706 when the linear speed of the optical disc is 1.4 m / s, and the minimum rotation speed of the spindle motor at this time is 1650 rpm, and the linear speed of the optical disc is 1.2 m / s. In this case, the physical addresses are from 43413 to 136955. In addition, in the case of the 8x speed zone area, when the linear speed of the optical disc is 1.4 m / s, the physical address is after 182706 and the linear speed of the optical disc is 1.2 m / s. The physical address is later than 136955.

      As mentioned above, although the Example of this invention was described in detail with reference to drawings, a specific structure is not limited to this Example, The design change etc. of the range which do not deviate from the summary of this invention are included. For example, in the present embodiment, a method of varying the zone layout according to the linear velocity and track pitch of the optical disc has been described. However, the zone layout is not changed for the linear velocity and track pitch of the optical disc. The double speed value may be varied. According to such a configuration, an optical recording device having a short recording time can be configured regardless of the linear velocity or track pitch, as in the method of varying the zone layout.

      Regarding the determination of the zone layout, the linear velocity and track pitch of the optical disc can be obtained for each optical disc at that time, and the layout can be determined by calculation from these values, but the present invention is not limited thereto. For example, the linear velocity of the optical disc can be determined. And a data table associated with the track pitch may be prepared, and the zone layout may be selected from the data table based on the obtained linear velocity and track pitch values.

      As described above, according to the present invention, there is an effect that the optimum zone layout can always be set for each optical disc regardless of the variation in the linear velocity or track pitch of the optical disc. In addition, the zone layout having the shortest recording time can be set for each optical disc by setting the setting of each zone layout within a range not exceeding the limit rotational speed of the spindle motor.

In addition, since the optimization of the zone layout is achieved only by the calculation, there is no need to add special hardware and the zone layout can be optimized for the optical disc without costing up.

Claims (4)

      In an optical recording apparatus which divides a recording area of an optical disc into several zones and records signals at a constant linear velocity in each zone,  Linear velocity measuring means for measuring the linear velocity of the optical disk;  Track pitch measuring means for measuring a track pitch of the optical disc;       Optical means having variable means for varying the starting physical address and the ending physical address in each zone based on the linear velocity measured by the linear velocity measuring means and the track pitch measured by the track pitch measuring means. Recording device.        The method of claim 1,        Storage means for storing the starting physical address of each zone corresponding to the reference linear velocity;       The variable means changes the starting physical address of each zone to the inner circumference of the optical disc rather than the starting physical address stored in the storage means when the linear velocity measured by the linear velocity measuring means is later than the reference value of the linear velocity. And when the measured linear velocity is faster than the reference value of the linear velocity, the start physical address of each zone is changed to the outer circumference of the optical disc than the start physical address stored by the storage means.        The method according to claim 1 or 2,        Has a motor for rotating the optical disc,        The change of the start physical address of each zone by the variable means is based on the linear velocity measured by the linear velocity measuring means and the track pitch measured by the track pitch measurement means, and the limit rotation of the corresponding motor in each zone. An optical recording apparatus, characterized in that executed within a range not exceeding a number.       The method of claim 1,       And the track pitch measuring means calculates a track pitch based on the maximum recordable physical address of the optical disc.

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