WO2007086377A1

WO2007086377A1 - Rotation control device, rotation control method and rotation control program

Info

Publication number: WO2007086377A1
Application number: PCT/JP2007/050996
Authority: WO
Inventors: Takashi Nakamura
Original assignee: Pioneer Corporation
Priority date: 2006-01-24
Filing date: 2007-01-23
Publication date: 2007-08-02
Also published as: JP2009093683A

Abstract

Provided is a rotation control device for more accurately controlling rotation of an optical disk at the time of recording information on a label surface and the like of the optical disk where recording tracks and like do not exist. The rotation control device (SR) for controlling rotation of the optical disk (DK) is provided with a pulse generating section (2) directly connected with a spindle motor (1); a speed/phase comparing section (5) for generating a speed error signal (Serd) and a first phase error signal (Ser1) which indicate rotation error based on each pulse in a pulse signal (Sfg) from the pulse generating section (2); a phase comparing section (8) for generating a second phase error signal (Ser2) which indicates a rotation error based on each pulse equivalent to timing wherein one rotation of the optical disk (DK) completes; and a driver (10) for controlling rotation of the optical disk (DK) based on the generated speed error signal (Serd), the first phase error signal (Ser1) and the second error signal (Ser2).

Description

Specification

Rotation control device, rotation control method, and rotation control program

Technical field

The present application belongs to the technical field of a rotation control device, a rotation control method, and a rotation control program, and more specifically, for example, a rotation control device, a rotation control method for controlling rotation of a disk such as an optical disc, and the rotation Background technology belonging to the technical field of programs used for control

In the field of optical discs in which information is optically recorded or reproduced using a light beam, in recent years, the surface of the optical disc irradiated with the information recording / reproducing light beam (hereinafter, this surface is referred to as an information recording surface). A technique has been developed for drawing visible characters, figures, etc. on the surface opposite to the above (hereinafter referred to as the label surface) using the light beam.

[0003] In this technique, by changing the intensity of the light beam radiated to one round of the same radial position on the label surface in accordance with the shape of the figure to be drawn on the label surface, By changing the reflectance of visible light at the position, the above-mentioned characters and figures are drawn so as to be visible by changing the gradation. In addition to this, it is possible to realize higher contrast as the graphic or the like by performing the intensity change control a plurality of times (for a plurality of turns) for the one turn.

[0004] On the other hand, when information is optically recorded on the information recording surface, conventionally, a recording track originally formed on the information recording surface is irradiated with the light beam for information recording. Based on the address information contained in the reflected light and so-called wobbling information, the recording position of the information is controlled and the rotational speed or the rotational speed of the optical disc itself is controlled.

[0005] However, it goes without saying that the recording surface is not formed on the label surface, so that the optical disk force that is the rotation target can be obtained particularly when controlling the rotational speed or the rotational speed. This is a situation that must be done without using information. [0006] In this regard, conventionally, the rotation of the optical disc is controlled based on the timing of each pulse in a pulse signal obtained by a so-called spindle motor force that rotates the optical disc. In such a configuration, as a configuration for improving the accuracy of the rotation control, for example, there is one exemplified in Patent Document 1 below.

Patent Document 1: JP 2005-317150

Disclosure of the invention

Problems to be solved by the invention

However, in the technique described in Patent Document 1 described above, it is assumed that the spindle motor car outputs a signal that is synchronized with the rotation with high accuracy. However, the accuracy of the synchronized signal is generally not so high from the viewpoint of component costs and the like, and the technique described in Patent Document 1 is difficult to say in practice.

[0008] For these reasons, even if a signal synchronized with the rotation of a spindle motor that rotates an optical disc that does not have any recording track or the like can be obtained with high accuracy, the rotation of the optical disc can be controlled with high accuracy. What is needed is a rotation control device.

[0009] Therefore, the present application has been made in view of the above circumstances, and an example of the problem is when recording information on a label surface of an optical disc on which no recording track exists.

A rotation control device and a rotation control method capable of controlling the rotation of the optical disc with higher accuracy even if a signal synchronized with the rotation of the spindle motor for rotating the optical disc cannot be obtained with high accuracy. We will provide a program used for rotation control.

Means for solving the problem

In order to solve the above-described problem, the invention according to claim 1 is a rotation control device that controls the rotation of a disk such as an optical disk, and a pulse generation unit that generates a pulse signal corresponding to the rotation state. A first error signal generating means such as a speed Z phase comparison unit that generates a first error signal indicating a rotation error in the rotation based on each pulse in the generated pulse signal; Of each of the pulses, a second error signal such as a phase comparison unit that generates a second error signal indicating a rotation error in the rotation based on the pulse corresponding to the timing at which one rotation is completed. Generation means, and control means such as a driver for controlling the rotation based on the first error signal and the second error signal generated respectively.

[0011] In order to solve the above-mentioned problem, the invention according to claim 7 generates a pulse signal corresponding to the state of the rotation by using a rotation control method for controlling the rotation of a disk such as an optical disc. A pulse generation step, a first error signal generation step for generating a first error signal indicating a rotation error in the rotation based on each pulse in the generated pulse signal, and one of the pulses. A second error signal generating step for generating a second error signal indicating a rotation error in the rotation based on the pulse corresponding to the timing at which the rotation ends, and the first error signal and the first error signal generated respectively. 2 and a control step for controlling the rotation based on an error signal.

[0012] In order to solve the above problem, an invention according to claim 8 is the rotation control apparatus according to any one of claims 1 to 6, wherein the rotation control apparatus includes the pulse generation unit. An included computer is caused to function as the first error generation means, the second error generation means, and the control means.

Brief Description of Drawings

FIG. 1 is a block diagram showing a schematic configuration of a rotation control device according to a first embodiment.

FIG. 2 is a timing chart showing the operation of the rotation control device according to the first embodiment.

FIG. 3 is a flowchart showing an operation of the rotation control device according to the first embodiment.

FIG. 4 is a block diagram showing a schematic configuration of a rotation control device according to a second embodiment.

FIG. 5 is a timing chart showing the operation of the rotation control device according to the second embodiment. Explanation of symbols

[0014] 1 Spinner motor

2 Pulse generator

3, 20 Error signal generator

4 Edge detector

5 Speed Z phase comparator

6 counter

7 Reference clock generator 8 Phase comparator

9 Waveform adjustment section

9A 1st equalizer

9B 2nd equalizer

9C 3rd equalizer

9D adder

10 Driver

21, 23 selector

22 Phase comparators

DK optical disc

SR, SRR rotation controller

BEST MODE FOR CARRYING OUT THE INVENTION

Next, the best mode for carrying out the present application will be described with reference to the drawings. The embodiment described below is included in a drawing apparatus that rotates an optical disk as a disk and draws a visible figure on the label surface of the optical disk, and controls the rotation state of the optical disk. This is an embodiment in which the present application is applied to a rotation control device.

[0016] (I) First embodiment

First, a first embodiment according to the present application will be described with reference to FIGS.

1 is a block diagram showing a schematic configuration of the rotation control device according to the first embodiment, FIG. 2 is a timing chart showing the operation of the rotation control device, and FIG. 3 is the rotation control device. It is a flowchart which shows this operation | movement. At this time, FIG. 1 is a block diagram showing only a portion of the drawing apparatus that functions as the rotation control apparatus according to the first embodiment.

As shown in FIG. 1, the rotation control device SR according to the first embodiment includes a spindle motor 1 on which an optical disc DK is fixed, and a plurality of hall elements (not shown) built in the spindle motor 1. A pulse generator 2 as a pulse generator configured to receive an output signal, an error signal generator 3, a waveform adjuster 9, and a controller And driver 10.

The error signal generation unit 3 includes an edge detection unit 4, a speed Z phase comparison unit 5 as a first error signal generation unit, a counter 6, a reference clock generation unit 7, and a second error signal. And a phase comparator 8 as a signal generating means.

[0020] Further, the amplitude adjusting unit 9 includes a first equalizer 9A, a second equalizer 9B, a third equalizer 9C, and an adder 9D.

In this configuration, the spindle motor 1 rotates the optical disc DK at a preset number of rotations based on the drive signal Sd from the driver 10.

[0022] The pulse generator 2 functions as V, a so-called FG (Frequency Generator), and a frequency corresponding to the rotational speed of the optical disc based on the output signals from the plurality of Hall elements. Is output to the error signal generation unit 3 as a pulse signal S¾. Here, the pulse signal Sfg is specifically a pulse signal Sfg including, for example, three pulses per optical disk DK—rotation.

Next, based on the pulse signal S¾, the error signal generation unit 3 uses all the pulses included in the pulse signal S¾, respectively, and a speed error signal Serd and a phase error signal ( Hereinafter, the phase error signal is referred to as a first phase error signal Serl) and is output to the amplitude adjusting unit 9 by a method similar to the conventional method. In addition to this, the error signal generation unit 3 uses only the pulse that is output every time one rotation of the optical disc DK is completed among all the pulses, and outputs another phase error signal (hereinafter referred to as the phase error signal) corresponding to the rotation state. The other phase error signal is used as the second phase error signal Ser2, and is output to the amplitude adjustment unit 9.

[0024] Thus, the first equalizer 9A in the amplitude adjusting unit 9 adjusts only the amplitude of the speed error signal Serd to a preset value to generate the first equalizer signal Seql, and sends it to the adder 9D. Output. The second equalizer 9B in the amplitude adjuster 9 adjusts only the amplitude of the first phase error signal Serl to a preset value to generate the second equalizer signal Seq2, and outputs it to the adder 9D. To do. Further, the third equalizer 9C in the amplitude adjusting unit 9 generates the third equalizer signal S eq3 by adjusting only the amplitude of the second phase error signal Ser2 to a preset value, and supplies it to the adder 9D. Output. Here, the adjustment of the amplitude in each equalizer is performed by multiplying each of the speed error signal Serd, the first phase error signal Serl, and the second phase error signal Ser2 by an experimentally set value in advance, for example. It is executed by doing. At this time, the multiplication value for the speed error signal Serd is A, the multiplication value for the first phase error signal Serl is B, and the multiplication value for the second phase error signal Ser2 is C. For example, it is preferable to set the relationship so that A>C> B (for example, A: C: B = 32: 10: 1)! /.

[0026] Next, the adder 9D adds the equalizer signals having the same timing to the first equalizer signal Seql, the second equalizer signal Seq2, and the third equalizer signal Seq3 to generate an addition signal Sadd. Output to driver 10.

[0027] Thereby, the driver 10 rotates the spindle motor 1 while executing a complete feedback control so as to compensate for the rotation error (rotation speed error, rotation unevenness, etc.) indicated by the addition signal Sadd. The drive signal Sd is generated for output to the spindle motor 1.

Next, details of the operation of the error signal generation unit 3 will be described with reference to FIGS. 1 and 2. In the following description, the rotational speed force at which the above-mentioned Nols signal S¾ including three pulses is output from the above-mentioned pulse generator 2 in response to the optical disk DK-rotation (in other words, the spindle motor rotation) It is assumed that the rotation speed is normal (in other words, the rotation speed should be controlled to that value).

[0029] As described above, the error signal generating unit 3 includes the edge detecting unit 4, the speed Z phase comparing unit 5, the force counter 6, the reference clock generating unit 7, and the phase comparing unit 8. The edge detection unit 4 determines the timing of only one of the rising edge and falling edge of each pulse included in the pulse signal Sfg and the difference between the timings of all the pulses included in the edge signal Seg. Detected for each edge, and outputs to edge 6 and velocity Z phase comparator 5 as edge signal Seg.

[0030] Here, in the following description, it is assumed that the timing of only the rising edge S and the edge of each pulse included in the pulse signal S¾ is detected as the edge signal Seg for each edge. .

On the other hand, the reference clock generation unit 7 determines the original rotation speed that the spindle motor 1 should rotate. Then, a clock signal Sclk having a frequency corresponding to a preset rotation speed is generated and output to the speed Z phase comparison unit 5 and the phase comparison unit 8.

Thus, the speed Z phase comparator 5 performs the timing indicated by the clock signal Sclk and the pulse for each pulse indicated by the edge signal S eg, as in the case of the conventional rotation control using the pulse signal S¾. The timing is compared, and the error is output to the amplitude adjuster 9 as the speed error signal Serd and the first phase error signal Serl.

More specifically, as illustrated in the uppermost stage in FIG. 2 and the second stage from the top, the intervals of the rising edges in the edge signal Seg are denoted as rl, r2, r3, r4,. A speed error signal at a timing where the error between each detected interval and the regular rising edge interval indicated by the clock signal Sclk is delayed by one wavelength of the edge signal Seg. The speed error signal Serd is generated so as to correspond to the amplitude of Serd, and is output to the amplitude adjusting unit 9.

In parallel with this, as illustrated in the second and third stages from the top of FIG. 2, the speed Z phase comparison unit 5 determines the interval between the rising edges in the edge signal Seg as the edge signal S. For example, P1A, P1B, P1C, P2A, P2B, P2C, etc. are detected separately and continuously for a plurality of rotations of the optical disc DK over one wavelength or more. An error between each detected interval P1A, P1B, P1C,... And the regular interval of the rising edge indicated by the clock signal Sclk corresponding to each interval is calculated for each interval. The first phase error signal Serl is generated so as to correspond to the amplitude of the first phase error signal Serl at the timing corresponding to the timing at which the error is detected, and is output to the amplitude adjusting unit 9.

On the other hand, the counter 6 according to the present application generates a timing signal Stmg (see the second stage from the bottom in FIG. 2) having a wavelength corresponding to the length of the optical disc DK—rotation in the edge signal Seg. Output to.

Accordingly, the phase comparison unit 8 according to the present application compares the timing indicated by the clock signal Sclk with the timing indicated by the timing signal Stmg, and the error is amplitude as the second phase error signal Ser2. Output to adjustment unit 9.

[0037] More specifically, as illustrated in FIG. 2 from the top to the bottom and from the bottom to the second, The interval of each rising edge in the timing signal Stmg is one wavelength, two wavelengths, three wavelengths, etc. (in other words, one rotation, two rotations, three rotations of the optical disc DK, ..)) Are detected separately and continuously as PP1A, PP1B, PP1C,..., And are indicated by the clock signal Sclk corresponding to each detected interval and each interval. The second phase error so that the error of the regular rising edge interval corresponding to the amplitude of the second phase error signal Ser2 at the timing corresponding to the timing at which the error is detected for each interval. A signal Ser2 is generated and output to the amplitude adjuster 9.

Next, the rotation control operation in rotation control device SR having the above-described configuration will be described with reference to FIG. 3 throughout.

As shown in FIG. 3, in the rotation control operation according to the first embodiment, a spindle motor is normally obtained by outputting only the first equalizer signal Seql generated from the speed error signal Serd to the driver 10. Rotation control of 1 is performed (step Sl). More specifically, normally, the output of the first phase error signal Serl and the second phase error signal Ser2 continues with the speed error signal Serd, but the second equalizer signal Seq2 and the third phase error signal Serd are continued. For the equalizer signal Seq3, the outputs of the second equalizer 9B and the third equalizer 9C are stopped (muted), respectively.

[0040] Then, during the rotation control using the speed error signal Serd, it is confirmed whether or not the force to stop the rotation of the optical disc DK (step S2), and when stopping (step S2; Y ES), The rotation control operation according to the first embodiment is finished as it is.

[0041] On the other hand, if the rotation control of the optical disc DK is continued (step S2; NO) after the determination in step S2, the rotation speed or the rotation speed becomes unstable for some reason. (Specifically, for example, whether or not the drawing accuracy on the label surface of the optical disc DK can no longer be maintained) is monitored (step S3), and when it becomes unstable (step S3; NO ), Return to the above step SI, and try to recover the instability by rotation control using only the first equalizer signal Seql generated from the speed error signal Serd

[0042] On the other hand, in the determination of step S3, the rotational speed or the rotational speed is unstable. If not (Step S3; YES), output of the second equalizer signal Seq2 is started from the second equalizer 9B to further improve stability and accuracy, and the above based on the speed error signal Serd. The first equalizer signal Seql is used for rotation control of the optical disc DK (step S4).

[0043] Next, during the rotation control using both the speed error signal Serd and the first phase error signal Serl, the rotation speed or the rotation speed becomes unstable for some reason as in the process of step S2. (Step S5), and when it becomes unstable (Step S5; NO), return to Step S1 and only the first equalizer signal Seql generated from the speed error signal Serd The rotation control force used will also be resumed and efforts will be made to restore its instability.

[0044] On the other hand, if it is determined in step S5 that the rotational speed or the rotational speed is not unstable (step S5; YES), whether or not the rotation of the optical disc DK is to be stopped next is confirmed ( In step S6), when stopping (step S6; YES), the rotation control operation according to the first embodiment is terminated as it is.

[0045] On the other hand, when the rotation control of the optical disc DK is continued (step S6; NO), the third equalizer 9C should be further improved in stability and accuracy when the determination in step S6 is continued. Output of the third equalizer signal Seq3 from the first equalizer signal Serl based on the second equalizer signal Seq2 based on the first phase error signal Serl and the first equalizer signal Serl based on the speed error signal Serd. Step S7).

[0046] Finally, during rotation control using all of the speed error signal Serd, the first phase error signal Serl, and the second phase error signal Ser2, some sort of process is performed in the same manner as in the process of step S2 or S5. It is monitored whether the rotational speed or the rotational speed becomes unstable due to the cause (Step S8) .If the rotational speed or rotational speed becomes unstable (Step S8; NO), the process returns to Step S4 and returns to the speed error signal Serd. Resume the rotation control using the second equalizer signal Seq2 generated from the generated first equalizer signal Seql and the first phase error signal Serl and try to recover the instability.

[0047] On the other hand, if it is determined in step S8 that the rotation speed or rotation speed is not unstable (step S8; YES), whether or not the rotation of the optical disk DK is to be stopped next is confirmed. If it is confirmed (step S9) and stopped (step S9; YES), the rotation control operation according to the first embodiment is terminated as it is.

[0048] On the other hand, if the rotation control of the optical disc DK is continued (step S9; NO) after the determination in step S9, the process returns to step S7 to maintain the current stability and rotation accuracy. The rotation control using all of the speed error signal Serd, the first phase error signal Serl, and the second phase error signal Ser2 is continued.

[0049] As described above, according to the operation of the rotation control device SR according to the first embodiment, the speed error signal corresponding to each pulse in the pulse signal S¾ generated according to the rotation of the optical disk DK. Since the rotation of the optical disc DK is controlled using both Serd and the first phase error signal Serl and the second phase error signal Ser2 corresponding to a pulse corresponding to one rotation, the speed error signal Serd and Based on the first phase error signal Serl alone, the second phase error signal Ser2, which is highly accurate based on pulses at longer intervals than when controlling the rotation, can be used more accurately in the rotation. The rotation speed or rotation speed can be controlled.

[0050] In addition, since the second phase error signal Ser2 corresponding to the timing at which one or a plurality of rotations are completed by calculating the timing force corresponding to one pulse is used for rotation control, the rotation of the optical disk DK is repeated. Thus, the rotational speed or the rotational speed of the optical disc DK can be accurately controlled in consideration of the accumulated rotational error.

[0051] Furthermore, since the speed error signal Serd, the first phase error signal Serl, and the second phase error signal Ser2 are both used for rotation control, the speed error signal Serd and two types of phase error signals Ser are used. Thus, it is possible to control the rotational speed or the rotational speed of the optical disc DK more accurately.

[0052] Furthermore, since the belief adjustment unit 9 converts the amplitude of the second phase error signal Ser2 to be larger than the amplitude of the first phase error signal Serl and adds both, it is used for rotation control. It is possible to accurately control the rotation of the optical disc DK while reducing the influence of the first phase error signal Serl, which is easily affected by uneven rotation.

[0053] In addition, the speed error signal Serd is always used for rotation control, and the first phase error signal Serl and the second phase error signal Ser2 are set to the first phase error signal Serl. Since the rotation control is performed earlier than that of the second phase error signal Ser2, the timing for starting to use for the rotation control is maintained, so that the accuracy of the rotation control can be maintained.

Note that, in the determination in step S8 shown in FIG. 3, when the rotational speed or the rotational speed becomes unstable (step S8; NO), the process returns to step SI and the first error generated from the speed error signal Serd. It is also possible to reconfigure the rotational control force using only the equalizer signal Seql and try to recover the instability.

[0055] (II) Second Embodiment

Next, a second embodiment, which is another embodiment according to the present application, will be described with reference to FIGS.

FIG. 4 is a block diagram showing a schematic configuration of the rotation control device according to the second embodiment, and FIG. 5 is a timing chart showing the operation of the rotation control device. 4 and FIG. 5, the same components as those in FIG. 1 and FIG. 2 in the first embodiment are given the same member numbers or reference numerals, and detailed description thereof is omitted.

In the first embodiment described above, as illustrated in FIG. 2, the timing of any one of the three pulses in the optical disc DK—rotation amount among all the pulses included in the Norse signal S fg. The second phase error signal Ser2 is generated from the starting point. However, in the second embodiment described below, the optical disk DK—of three rotations included in the pulse signal S¾, Rotating the optical disc DK by generating a second phase error signal (hereinafter, the second phase error signal according to the second embodiment is referred to as a second phase error signal Sr2) starting from the timing of all pulses. Used for control.

As shown in FIG. 4, the rotation control device SRR according to the second embodiment includes a spindle motor 1 having a configuration and functions similar to those of the rotation control SR according to the first embodiment, and pulse generation. In addition to the unit 2, the waveform adjustment unit 9 and the driver 10, the error signal generation unit 20 has a unique configuration as the second embodiment.

[0059] Then, the error signal generation unit 20 includes an edge detection unit 4, a speed Z phase comparison unit 5 and a reference clock having the same configuration and functions as those of the error signal generation unit 3 according to the first embodiment. In addition to the generation unit 7, the switches 21 and 23 and the phase comparator group 22 are configured. [0060] Furthermore, the phase comparator group 22 includes the same number of phase comparators as the number of pulses (three in the case of the first and second embodiments) of the pulse signal S¾ corresponding to the optical disc DK—rotation. I have.

[0061] In this configuration, the switching device 21 sets the rising timing of each of the three pulses corresponding to the time required for the optical disk DK-rotation among all the pulses included in the edge signal Seg as each rising timing, and Timing signals Stl to St3 (see the 4th stage from the top to the 2nd stage from the bottom in Fig. 5) having a wavelength equal to the one rotation are generated, and each is separately sent to each phase comparator in the phase comparator group 22. Output.

[0062] Thereby, each of the phase comparators individually compares the timing indicated by the clock signal Sclk with the timing indicated by the timing signals Stl to St3, and the errors are respectively compared with the error signals Sgl to Sg3. To switch 23.

[0063] Then, the switch 23 generates a second phase error signal Sr2 having the timing error indicated by each of the error signals Sgl to Sg3 as an amplitude, and the third equalizer signal in the belief adjustment unit 9 is generated. The output to 9C.

More specifically, as illustrated in FIG. 5 from the top to the second stage and from the fourth stage to the sixth stage from the top, the rising edge of three pulses corresponding to the optical disc DK—rotation in the edge signal Seg. The above three timing signals Stl to St3 having the timing as the respective rising timings and the optical disc DK—the length of rotation as the length of each wavelength are generated in the switch 21, and are individually phase comparator groups 22. Are output to each phase comparator.

[0065] As illustrated in the fourth and bottom stages of the upper force in FIG. 5, the first phase comparator and the switch 23 (not shown) in the phase comparator group correspond to one wavelength in the timing signal Stl. Wavelengths and three wavelengths (in other words, one rotation, two rotations, and three rotations) of the optical disc DK are detected separately and continuously as Sela, Selb, and Selc, respectively. The error between each time and the rising edge interval corresponding to one rotation, two rotations, and three rotations of the optical disc DK in the clock signal Sclk is the timing signal Stl! The second phase error signal Sr2 is generated so as to correspond to the amplitude of the second phase error signal Sr2 at the timing immediately after the passage of Selb and Selc, and is output to the amplitude adjuster 9. In parallel with this, the second phase comparator and switch 23 (not shown) in the group of phase comparators, as illustrated in the fifth and bottom stages from the top of FIG. Wavelength, two-wavelength, and three-wavelength times are separately and continuously detected as Se2a, Se2b, and Se2c, respectively, and the detected time and one rotation of the optical disc DK in the clock signal Sclk. The difference between the rising edge interval corresponding to minutes, two rotations and three rotations is the amplitude of the second phase error signal Sr2 at the timing immediately after the time Se2a, Se2b and Se2c have elapsed in the timing signal St2. The second phase error signal Sr2 is generated so as to correspond to and is output to the amplitude adjuster 9.

[0067] Further, the third phase comparator and switch 23 (not shown) in the phase comparator group includes two wavelengths in the timing signal St3, as illustrated in the sixth and bottom stages from the top in FIG. Wavelengths and three-wavelength times are detected separately and continuously as Se3a, Se3b, and Se3c, respectively, and the detected times and two rotations of the optical disk DK in the clock signal Sclk. The error between the rising edge interval corresponding to the rotation amount and the three rotation amount corresponds to the amplitude of the second phase error signal Sr2 at the timing immediately after the above-described times Se3a, Se3b, and Se3c have elapsed in the timing signal St3. Then, the second phase error signal Sr2 is generated and output to the amplitude adjusting unit 9.

[0068] Thereafter, in addition to the speed error signal Serd and the first phase error signal Serl similar to those of the rotation control device SR according to the first embodiment, the second phase error signal Sr2 is used for the first implementation. In the embodiment, the same operation as that described with reference to FIG. 3 is performed to execute the rotation control operation according to the second embodiment.

As described above, according to the operation of the rotation control device SRR according to the second embodiment, the speed error signal Serd corresponding to each pulse in the pulse signal Sfg generated according to the rotation of the optical disc DK and Since the rotation of the optical disc DK is controlled using both the first phase error signal Serl and the second phase error signal Sr2 corresponding to a pulse corresponding to one rotation, the speed error signal Serd and the first phase error are controlled. Using the second phase error signal Sr2 based on pulses with longer intervals compared to controlling the rotation based only on the signal Serl, the rotational speed or number of rotations can be controlled more accurately. Can do. [0070] Further, each timing force corresponding to all pulses generated during one rotation of the optical disc DK is rotated, and the second error signal Sr2 corresponding to each timing at which one or a plurality of rotations respectively ends is rotated. Since it is used for control, it is possible to accurately control the rotation speed or the number of rotations of the optical disk DK in consideration of the rotation error accumulated by the repeated rotation of the optical disk DK.

[0071] Furthermore, since both the speed error signal Serd, the first phase error signal Serl, and the second phase error signal Sr2 are used for rotation control, the speed error signal Serd and two types of phase error signals are used. It is possible to accurately control the rotation speed or rotation speed of the optical disc DK.

[0072] Furthermore, the belief adjustment unit 9 converts the amplitude of the second phase error signal Sr2 to be larger than the amplitude of the first phase error signal Serl, adds both of them, and uses them for controlling the rotation. Thus, it is possible to accurately control the rotation of the optical disc DK while reducing the influence of the first phase error signal Serl which is easily affected by the rotation unevenness.

[0073] In addition, the speed error signal Serd is always used for rotation control, and the first phase error signal Serl and the second phase error signal Sr2 start to use the first phase error signal Serl for rotation control. Since the rotation is controlled earlier than that of the second phase error signal Sr2, the accuracy of the rotation control can be maintained.

[0074] In the second embodiment described above, out of the pulses of the pulse signal Sfg, the force using all three pulses corresponding to the optical disk DK-rotation as the starting point When the number of corresponding pulses is large, the second phase error signal Sr2 can be generated using a part of the pulses (for example, half or one-third) as starting points. In this case, if the homogeneity as the second phase error signal Sr2 is taken into consideration, it is preferable to select the pulse as the starting point at a medium force equal interval corresponding to the one rotation.

[0075] Further, in each of the above-described embodiments, the order of utilizing each error signal is as shown in FIG.

Speed error signal Serd → Speed error signal Serd + 1st phase error signal Serl → Speed error signal Serd + 1st phase error signal Serl + 2nd phase error signal Ser2 (Sr2) In addition to this, only the speed error signal Serd and the second phase error signal Ser2 (Sr2) are used without using the first phase error signal Serl.

The speed error signal Serd → speed error signal Serd + second phase error signal Ser2 (Sr2) may be used.

[0076] Furthermore, each of the above-described embodiments has the force described in the case where the present application is applied to the rotation control of the optical disc DK in a drawing apparatus that draws an image that is visible on the label surface of the optical disc DK. In addition to this, no information can be obtained from the optical disc DK, and a signal synchronized with the rotation of the spindle motor 1 such as the pulse signal S¾ cannot be obtained with high accuracy. In some cases, the present application can be widely applied.

[0077] Furthermore, a program corresponding to the flowchart and timing chart shown in FIG. 2, FIG. 3 or FIG. 5 is recorded on an information recording medium such as a flexible disk or a hard disk, or acquired via the Internet or the like. It is also possible to utilize the computer as the rotation control device SR or SRR according to each embodiment by reading out and executing these on a general-purpose computer.

Claims

The scope of the claims

[1] In the rotation control device that controls the rotation of the disk,

Pulse generation means for generating a pulse signal corresponding to the rotation state, and first error signal generation means for generating a first error signal indicating a rotation error in the rotation based on each pulse in the generated pulse signal When,

A second error signal generating means for generating a second error signal indicating a rotation error in the rotation based on the pulse corresponding to the timing at which one rotation of the pulses ends, among the pulses;

Control means for controlling the rotation based on the first error signal and the second error signal respectively generated;

A rotation control device comprising:

[2] In the rotation control device according to claim 1,

The second error signal generation means generates the second error signal corresponding to the timing at which one or a plurality of rotations are completed by calculating a timing force corresponding to one preset pulse. A rotation control device that outputs to the control means.

[3] In the rotation control device according to claim 1,

The second error signal generating means calculates each timing force corresponding to the plurality of pulses generated during one rotation, and each timing at which one or a plurality of rotations end. A rotation control device that generates the corresponding second error signal and outputs the second error signal to the control means.

[4] In the rotation control device according to any one of claims 1 to 3,

The first error signal generating means includes a speed error signal indicating a speed error in the rotation based on each pulse, and a first phase error signal indicating a phase error in the rotation based on each pulse. Generated and output to the control means together,

The second error signal generating means reduces a phase error or speed error in the rotation based on the pulses corresponding to the timing at which one rotation is completed. A rotation control device that generates the second error signal indicating at least one of them and outputs the second error signal to the control means.

[5] In the rotation control device according to claim 4,

The control means adds the second phase error signal to the first phase error signal so that the amplitude of the second phase error signal is larger than the amplitude of the first phase error signal, and rotates the rotation. Rotation control device, characterized in that it is used to control

[6] In the rotation control device according to claim 4 or 5,

The control means always uses the speed error signal for controlling the rotation, and intermittently uses the first phase error signal and the second phase error signal, respectively, and controls the rotation of the first phase error signal. A rotation control device characterized in that the start timing is used for the rotation control earlier than the start timing for using the second phase error signal for the rotation control.

[7] In the rotation control method for controlling the rotation of the disk,

A pulse generation step for generating a pulse signal corresponding to the rotation state, and a first error signal generation step for generating a first error signal indicating a rotation error in the rotation based on each pulse in the generated pulse signal When,

A second error signal generating step of generating a second error signal indicating a rotation error in the rotation based on the pulse corresponding to the timing at which one rotation of the pulses ends among the pulses;

A control step of controlling the rotation based on the first error signal and the second error signal generated respectively;

The rotation control method characterized by including.

[8] A computer included in the rotation control device according to any one of claims 1 to 6, wherein the rotation control device includes the pulse generation unit.

The first error generating means;

The second error generating means; and

The control means;

Rotation control program characterized by functioning as