JP2005222572A - Optical disk device, and its control device and method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To complete a digital signal processing within the control cycle of predetermined shortened time by using the conventional LSI of an arithmetic operation processing speed without increasing the arithmetic operation processing speed of a digital signal processing LSI for the shortened control cycle time of focusing or tracking accompanying the high doubling speed of the reproducing/recording speed of an optical disk. <P>SOLUTION: According to the control state of an optical disk, the necessity/nonnecessity of a subfocus error signal or a subtracking error signal is properly selected by using a subfocus error signal changeover switch 117 or a subtracking error signal changeover switch 118, an unnecessary arithmetic operation processing step is eliminated to execute focus or tracking control, and high double speed optical disk control is executed by using the DSP arithmetic operation processing constitution of conventional performance. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an optical disc apparatus that performs focus control using a main focus error signal and a sub focus error signal, and performs tracking control using a main tracking error signal and a sub tracking error signal, and a control apparatus and control method therefor About.

  In an optical disk apparatus, a technique for controlling an optical disk by communicating a plurality of servo error signals such as a main focus error signal, a sub focus error signal, a main tracking error signal, and a sub tracking error signal by time division multiplexing is disclosed in Patent Document 1. It is described in. FIG. 2 shows an example of the configuration of a conventional optical disc apparatus.

  The optical disc apparatus extracts the information of the optical disc and converts it into an electrical signal, and the analog main focus error (main FE) signal a and sub focus error (sub FE) signal b from the electrical signal extracted by the pickup 201. An analog signal processing LSI 206 that detects four types of signals, a main tracking error (main TE) signal c and a sub-tracking error (sub TE) signal d, and the four types of analog signals processed by the analog signal processing LSI 206 The digital signal processing LSI 217 generates a focus signal and a tracking signal for focus control and tracking control based on digital signal processing.

  The pickup 201 includes a laser diode (LD) 203, a photodiode (PD) 202, and an actuator 204, and the photodiode 202 receives reflected light irradiated from the laser diode 203 to the optical disk. Then, from the received reflected light, the pickup 201 extracts information recorded on the optical disc as an electric signal based on a current value. The extracted electric signal with the current value is converted into an electric signal with a voltage value by the I / V converter 205 and input to the analog signal processing LSI 206.

  The analog signal processing LSI 206 includes a focus error (FE) detection circuit 207, a tracking error (TE) detection circuit 208, and a multiplexer (MPX) 209, and an electric signal based on a voltage value input from the I / V converter 205. The focus error detection circuit 207 detects the main FE signal and the sub FE signal, and the tracking error detection circuit 208 detects the main TE signal and the sub TE signal. These four detected signals are input to the MPX 209 in parallel. The MPX 209 is a circuit that serially outputs the four analog signals input in parallel by time division processing. This is mounted for the purpose of deleting the signal pins of the LSI. The analog output signal from the MPX 209 is input to the digital signal processing LSI 217.

  The digital signal processing LSI 217 digitally converts the FE signal and TE signal for performing focus control and tracking control based on the four signals including the input analog main FE signal, sub FE signal, main TE signal, and sub TE signal. It is a circuit that generates by signal processing and further converts the digitally processed signal into an analog FE signal and a TE signal and outputs them. Its internal configuration is as follows. The four serial analog signals input from the MPX 209 are converted into digital main FE signals, sub FE signals, main TE signals and sub TE signals by the A / D converter 210, and a digital signal processing DSP (Digital) (Signal Processor) 218. The DSP 218 includes a focus control processing unit 212 and a tracking control processing unit 213. Of the four signals converted into digital signals, the main FE signal and the sub FE signal are sent to the focus control processing unit 212 and the main TE signal. And the sub TE signal are input to the tracking control processing unit 213, the focus control processing unit 212 outputs a digital FE signal, and the tracking control processing unit 213 outputs a digital TE signal. Here, the focus control processing unit 212 and the tracking control processing unit 213 perform signal processing under the control of the control block 214. Further, the control block 214 controls the A / D conversion instruction generation circuit 211. By this control, the A / D conversion command generation circuit 211 transmits a command to the MPX 209 and the A / D converter 210 of the analog signal processing LSI 206, and the analog main FE signal, sub FE signal, main TE signal, and sub TE The signal is subjected to time division processing and digitization processing. The digital FE signal and TE signal obtained from the DSP 218 are converted into analog signals by the D / A converters 215 and 216. The analog FE signal and TE signal obtained from the digital signal processing LSI 217 are input to the actuator 204 of the pickup 201. Based on the input analog FE signal and TE signal, the actuator 204 performs focus control of the focusing lens and tracking control of the condenser lens.

  Hereinafter, the sub-FE signal and the sub-TE signal will be described with reference to FIG.

  The FE signal detection circuit 207 outputs a main FE signal 301 and a sub FE signal 302 by an astigmatism method. 3A shows the time change of the signal level of the main FE signal 301, and FIG. 3B shows the time change of the signal level of the sub FE signal 302. Further, FIG. 3C shows the time change of the signal level of the FE signal 303. The FE signal 303 indicates a deviation between the focal point of the light beam applied to the disc and the information surface of the disc, and is a signal used for focus control. The actuator 214 of the pickup 201 described above controls the position of the focusing lens in accordance with the FE signal 303 so that the light beam is always focused on the information surface of the disc. However, the astigmatism method has a problem that a disturbance noise 307 is generated for the main FE signal 301 when an optical spot for optical pickup crosses a track on the recording film surface. This disturbance noise 307 is removed by the sub-FE signal 302. That is, by adding the main FE signal 301 and the sub 302 with an appropriate gain ratio, the disturbance noise 307 on the main FE signal 301 and the disturbance noise 308 on the sub FE signal 302 are canceled out and removed. It is possible to generate the FE signal 303 of FIG.

  Next, the TE signal detection circuit 208 outputs a main TE signal 304 and a sub TE signal 305 by a differential push-pull (DPP, Differential Push-Pull) method. FIG. 3D shows the time change of the signal level of the main TE signal 304, and FIG. 3E shows the time change of the signal level of the sub TE signal 305. Further, FIG. 5F shows the time change of the signal level of the TE signal 306. The TE signal 306 indicates a deviation between the light spot on the disk and the target track, and is a signal used for tracking control. The actuator 214 of the pickup 201 described above controls the position of the condenser lens in accordance with the TE signal 306, and operates so that the light beam spot always follows the track of the optical disk. However, there is a problem that an offset 309 occurs in the main TE signal 304 due to a lens shift during seeking or the like. This offset 309 is removed by the sub TE signal 305. There are two light spots for detecting the sub TE signal 305, and they are arranged on both sides centering on the spot for detecting the main TE signal 304 by a half of the period of the guide groove. By subtracting the main TE signal 304 and the sub TE signal 305 thus obtained by an appropriate gain ratio, the offset 309 on the main TE signal 304 and the offset 310 on the sub TE signal 305 are canceled, and the offset It is possible to generate the TE signal 306 of FIG.

The MPX 209 is employed for the purpose of reducing the number of IC pins between LSIs in order to reduce costs and improve reliability. The selection method of each error signal in the MPX 209 is determined in advance in the order of switching by the A / D conversion command generation circuit 211 existing in the digital signal processing LSI 217. This determination is performed by searching a table stored in the built-in ROM when the optical disk device is activated. A signal selected by the MPX 209 is determined by transferring data created from the determined conversion condition by the serial transmission means.
JP 2002-197685 A

  However, it is necessary to increase the frequency band of the control operation in order to realize stable focus control and tracking control by following surface blurring and eccentricity in increasing the speed of reproduction and recording of the optical disc. However, when increasing the frequency band of the control operation and performing arithmetic processing using the DSP 218 having the conventional performance as it is, the processing steps constituting the predetermined control cycle cannot be accommodated within the predetermined time. There was a step that could not be processed. Hereinafter, the relationship between individual arithmetic processing and their processing cycles will be described with reference to FIG.

  FIG. 4 shows the relationship between the cycle and DSP arithmetic processing at low speed and high speed. 4A shows a conventional arithmetic processing cycle 401 (at low speed), FIG. 4B shows a DSP arithmetic processing 402 at low speed, and FIG. 4C shows an arithmetic processing cycle at high speed. 407, and FIG. 4D shows the DSP arithmetic processing 408 at high speed on the time axis. Here, the calculation process 402 includes steps of a main FE process 403, a sub FE process 404, a main TE process 405, and a sub TE process 406. The calculation process 408 includes a main FE process 409, a sub FE process 410, a main FE process 405, and a main FE process 405. This comprises steps of TE processing 411 and sub TE processing 412. Each of these individual steps is processed in 7 μs.

  At the conventional low speed, the DSP 218 processes the four signals of the main FE signal, the sub FE signal, the main TE signal, and the sub TE signal A / D converted by the A / D converter 210, that is, the calculation of the main FE signal. The processing 403, the sub-FE signal calculation processing 404, the main TE signal calculation processing 405, and the sub-TE signal calculation processing 406 can be accommodated in one cycle of 30 μs.

  However, as shown in FIG. 4C, when processing is performed at a high speed cycle of 25 μs, when an LSI having a conventional capability is used, the operation frequency band is low, so the arithmetic processing of the DSP 218 is not in time. As shown in FIG. 4D, the processing time for the calculation process 412 of the sub TE signal is lost. That is, if one cycle is within 30 μs compared to the conventional processing capability that requires 28 μs (7 μs × 4) in one cycle of main FE processing, sub FE processing, main TE processing, and sub TE processing, Although the control can be performed normally, the sub-TE signal calculation process 412 cannot be performed at a high speed of 25 μs per cycle. In this case, it can be dealt with by increasing the number of operation clocks. Conventionally, in order to solve this problem, a high-performance DSP that operates at a high frequency is used. However, this high performance DSP has caused an increase in cost and an increase in power consumption.

  The present invention solves the above-mentioned problems, and the object of the present invention is to improve the processing speed even when the cycle of the arithmetic processing is shortened as the reproduction and recording times are increased, without improving the processing speed. It is to keep within a predetermined cycle time using an LSI with the performance described above.

  In order to achieve the above object, the present invention focuses on the fact that sub-FE signal processing or sub-TE signal processing is not necessarily required in the control state of a specific optical disc. By reducing the number of steps, the overall signal processing cycle time is shortened and high-speed processing is realized.

  In other words, the control device for the optical disk apparatus according to the first aspect of the present invention is a signal obtained from the optical disk, the main focus error signal and a subfocus error signal for removing unnecessary signals included in the main focus error signal, and In a control apparatus for an optical disc apparatus that performs focus control and tracking control of the optical disc using an optical pickup signal including a main tracking error signal and a sub-tracking error signal for removing an unnecessary signal included in the main tracking error signal, A focus error signal generating means for generating a focus error signal from two signals of a focus error signal and the sub focus error signal or only from the main focus error signal; and the main tracking error A tracking error signal generating means for generating a tracking error signal from two signals of the first signal and the sub-tracking error signal or only from the main tracking error signal; and a signal input to the focus error signal generating means A focus error signal switching means for switching between an error signal and two signals of the subfocus error signal and a case of inputting only the main focus error signal, and a signal input to the tracking error signal generating means, Tracking error signal switching means for switching between the input of the main tracking error signal and the sub-tracking error signal and the input of only the main tracking error signal. Characterized in that the Kasuera signal switching means and the tracking error signal switching means and a switching control means for switching in accordance with a control state of the optical disc.

  According to a second aspect of the present invention, in the control device for the optical disk device according to the first aspect, the focus error signal switching means has a first predetermined value or more in the main focus error signal with respect to the control state of the optical disk. When an unnecessary signal is superimposed, the signal is switched so that the sub focus error signal is input to the focus error signal generation unit, and the tracking error signal switching unit is configured to add a second predetermined value or more to the main tracking error signal. When the unnecessary signal is superimposed, the signal is switched so that the sub-tracking error signal is input to the tracking error signal generating means.

  According to a third aspect of the present invention, in the control device for the optical disk device according to the second aspect, the digital signal processing means for performing digital signal processing is provided, and the digital signal processing means includes the focus error signal generating means, the tracking error signal, and the like. It comprises a generating means, the focus error signal switching means and the tracking error signal switching means.

  According to a fourth aspect of the present invention, in the control apparatus for an optical disc apparatus according to the first, second, or third aspect, at least one first AD conversion means for converting the subfocus error signal or the subtracking error signal into a digital signal is provided. The focus error signal switching means and the tracking error signal switching means switch the digital signal after AD conversion by the first AD conversion means.

  According to a fifth aspect of the present invention, in the control device for the optical disk device according to the first, second, or third aspect, the analog main focus error signal, the subfocus error signal, the main tracking error signal, and the like based on the optical pickup signal Output signal switching means for performing time division multiplexing output by sequentially switching the sub-tracking error signals, and second AD conversion means for sequentially converting the analog signals time-division multiplexed by the output signal switching means into digital signals. The focus error signal switching means and the tracking error signal switching means switch the output signal of the second AD conversion means.

  According to a sixth aspect of the present invention, in the control apparatus for the optical disc apparatus according to the first aspect, the focus error signal switching means is the focus error signal generating means when the tracking control is in the control state of the optical disc. It is switched so that only the main focus error signal is input as a signal to be input to the signal, and when the tracking control is off, the signal is switched so that two signals of the main focus error signal and the sub focus error signal are input. It is characterized by that.

  According to a seventh aspect of the present invention, in the control apparatus for an optical disc apparatus according to the first or sixth aspect, the tracking error signal switching means is configured to detect the tracking error signal when the tracking control is in the control state of the optical disc. Switch to input only the main tracking error signal as a signal to be input to the generating means, and switch to input two signals of the main tracking error signal and the sub-tracking error signal when the tracking control is off. It is characterized by that.

  According to an eighth aspect of the present invention, in the control device for the optical disc apparatus according to the first aspect, the focus error signal switching means includes a plurality of light spots with respect to the optical disc in which a recording area is formed of a plurality of different physical layers. When the optical disk is in a control state when moving between physical layers, a signal to be input to the focus error signal generating means, two signals of the main focus error signal and the sub focus error signal are input; Switching between the case where only the main focus error signal is input is performed.

  According to a ninth aspect of the present invention, in the control device for an optical disc apparatus according to the first or eighth aspect, the tracking error signal switching means causes a light spot to be emitted from the optical disc having a recording area formed of a plurality of different physical layers. When two signals of the main tracking error signal and the sub-tracking error signal are input to the tracking error signal generating means when the optical disk is in the control state when moving between the plurality of physical layers And switching between when only the main tracking error signal is input.

  According to a tenth aspect of the present invention, in the control device for the optical disk device according to the first aspect, the focus error signal switching unit is configured to move the light spot to another physical area with respect to the optical disk having a different physical area. When the optical disk is in a control state, two signals, the main focus error signal and the subfocus error signal, are input to the focus error signal generation unit, and only the main focus error signal is input. It is characterized by switching between cases.

  According to an eleventh aspect of the present invention, in the control device for an optical disc apparatus according to the first or tenth aspect, the tracking error signal switching means moves the light spot to another physical region with respect to the optical disc having a different physical region. When the optical disc is in the control state, the signal to be input to the tracking error signal generating means is the two signals of the main tracking error signal and the sub tracking error signal, and only the main tracking error signal is input. It is characterized in that it is switched between when inputting.

  An optical disk apparatus according to a twelfth aspect of the present invention comprises the control device for an optical disk apparatus according to the first, second, third, fourth, fifth, sixth, seventh, eighth, ninth, tenth or eleventh aspects, and records information on the optical disk. Alternatively, the recording information of the optical disc is reproduced.

  According to a thirteenth aspect of the present invention, there is provided a control method for an optical disc device, which is a signal obtained from an optical disc, a main focus error signal, a sub focus error signal for removing unnecessary signals included in the main focus error signal, and main tracking. In the optical disc control method for performing focus control and tracking control of the optical disc using an optical pickup signal including a sub-tracking error signal for removing an unnecessary signal included in the error signal and the main tracking error signal, the main focus error signal And a first step of generating a focus error signal from two signals of the subfocus error signal or only from the main focus error signal, the main tracking error signal and the subtracking A second step of generating a tracking error signal from two signals of the error signal or only from the main tracking error signal; and two signals of the main focus error signal and the subfocus error signal in the first step. In the third step of switching the signal to be used between the case of using the main focus error signal and the case of using only the main focus error signal, and the second step, two signals of the main tracking error signal and the sub tracking error signal are used. And the fourth step of switching the signal to be used in the case of using only the main tracking error signal, and the switching of the signals in the third and fourth steps are switched according to the control state of the optical disc. And a process.

  The invention according to claim 14 is the method of controlling an optical disc device according to claim 13, wherein the control state of the optical disc is set to a state where tracking control is turned on, the step of turning off the tracking control, and the tracking control. Generating the focus error signal without using the subfocus error signal when turning on, and generating the focus error signal using the subfocus error signal when turning off the tracking control. It is characterized by including.

  According to a fifteenth aspect of the present invention, in the method of controlling an optical disc device according to the thirteenth or fourteenth aspect, the step of turning the tracking control on in the control state of the optical disc, the step of turning off the tracking control, Generating the tracking error signal without using the sub-tracking error signal when the tracking control is turned off, and generating the tracking error signal using the sub-tracking error signal when the tracking control is turned on. It is characterized by including.

  According to a sixteenth aspect of the present invention, in the method for controlling an optical disk device according to the thirteenth aspect, the optical spot is different from the optical disk formed by a plurality of physical layers having different recording areas. And a step of generating a focus error signal without using the subfocus error signal when moving the light spot between the layers.

  According to a seventeenth aspect of the present invention, in the method of controlling an optical disc device according to the thirteenth or sixteenth aspect, the optical spot is controlled by changing the control state of the optical disc with respect to the optical disc formed by a plurality of physical layers having different recording areas. A step of moving to a different physical layer, and a step of generating the tracking error signal without using the sub-tracking error signal when moving the light spot between the layers.

  According to an eighteenth aspect of the present invention, in the control method of the optical disc device according to the thirteenth aspect, the control state of the optical disc is changed to a state in which a light spot moves to another physical region with respect to the optical disc having a different physical region. And a step of generating the focus error signal without using the subfocus error signal when the light spot is moved to the other physical region.

  According to a nineteenth aspect of the present invention, in the method for controlling an optical disk device according to the thirteenth or eighteenth aspect, the optical spot moves to another physical area with respect to the optical disk having a different physical area. And a step of generating the tracking error signal without using the sub-tracking error signal when the light spot is moved to the other physical region.

  According to a twentieth aspect of the invention, in the method of controlling an optical disc device according to the thirteenth aspect, the step of switching the control state of the optical disc from the reproduction state to the recording state, the step of switching from the recording state to the reproduction state, and the sub The method includes a step of generating the focus error signal without using a focus error signal, and a step of generating the focus error signal by using the subfocus error signal during reproduction.

  According to a twenty-first aspect of the present invention, in the method for controlling an optical disc device according to the thirteenth or twentieth aspect, the step of switching the control state of the optical disc from the reproduction state to the recording state, the step of switching from the recording state to the reproduction state, The method includes generating the tracking error signal using the sub-tracking error signal, and generating the tracking error signal using the sub-tracking error signal during reproduction.

  As described above, in the invention described in claims 1 to 21, it is selected whether to use the sub focus error signal in addition to the main focus error signal when generating the focus error signal according to the control state of the optical disc. Further, since it is selected whether to use the sub-tracking error signal in addition to the main tracking error signal when generating the tracking error signal, the entire signal processing time can be adjusted according to the control state of the optical disc. .

  According to the second aspect of the invention, the focus error signal switching means is a focus error signal generating means for removing the unnecessary signal when the main focus error signal includes an unnecessary signal equal to or greater than the first predetermined value. And a tracking error signal switching means for tracking error signal generating means for removing the unnecessary signal when the main tracking error signal includes an unnecessary signal equal to or greater than the second predetermined value. Since the signal is switched so as to input the sub-tracking error signal, the sub-focus error signal or the sub-tracking error signal is processed only when necessary.

  As described above, according to the optical disc device and the control device and the control method thereof according to the first to twenty-first aspects of the present invention, when the subfocus error signal or the sub tracking error signal is not required according to the control state of the optical disc, The focus error signal switching unit and the tracking error signal switching unit are appropriately switched so that these signals are not used. As a result, it is possible to obtain an effect that the arithmetic processing can be held within a predetermined cycle time by using the LSI having the conventional performance with respect to the shortening of the arithmetic processing cycle accompanying the increase in speed. In addition, it is not necessary to use a high-performance DSP, and cost reduction and low power consumption can be realized.

  According to the fourth aspect of the present invention, when the sub FE signal or the sub TE signal is not used, the FE signal switching or the TE signal switching is performed before the A / D converter. There is an effect that the efficiency of the A / D conversion process can be increased without performing the conversion. Further, it is not necessary to provide an A / D converter for each corresponding signal, and processing can be performed with a small number of A / D converters, so that cost reduction can be realized.

  Further, according to the fifth aspect of the present invention, when the sub FE signal or the sub TE signal is not used, the effect of increasing the efficiency of the MPX transfer processing can be obtained by performing the FE signal switching or the TE signal switching by the MPX. It is done.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
(First embodiment)
FIG. 1 is a block diagram showing the configuration of the optical disc apparatus according to the first embodiment of the present invention. The optical disc apparatus of FIG. 1 extracts an optical disc information and converts it into an electrical signal, and an analog main focus error (main FE) signal a, sub focus error (sub FE) from the electrical signal extracted by the pickup 101. ) Analog signal processing LSI 107 that detects four types of signals, signal b, main tracking error (main TE) signal c, and sub-tracking error (sub TE) signal d, and focus control by digital signal processing based on the four types of signals And a digital signal processing LSI 114 for generating a focus signal and tracking signal for tracking control. In the optical disk apparatus of the present invention, in the control device composed of the analog signal processing LSI and the digital signal processing LSI, the sub FE signal b is used to remove disturbance noise (unnecessary signal) of the main FE signal a, and the sub TE The signal d is used to remove the offset (unnecessary signal) of the main TE signal c.

  In FIG. 1, a pickup 101 includes a laser diode (LD) 103, a photodiode (PD) 102, and an actuator 104. The reflected light irradiated from the laser diode 103 to the optical disk is received by the photodiode 102 and recorded on the optical disk. The extracted information is extracted as an electric signal based on the current value. The electrical signal based on the extracted current value is converted into an electrical signal based on the voltage value by the I / V converter 105 and input to the analog signal processing LSI 107.

  The analog signal processing LSI 107 includes a focus error (FE) detection circuit 108 and a tracking error (TE) detection circuit 109, and a focus error based on an electric signal based on a voltage value input from the I / V converter 105 described above. The detection circuit 108 detects the main FE signal and the sub FE signal, and the tracking error detection circuit 109 detects the main TE signal and the sub TE signal. These four detected signals are input to the digital signal processing LSI 114 in parallel.

  The digital signal processing LSI 114 digitally processes four signals including the input analog main FE signal, sub FE signal, main TE signal, and sub TE signal, and outputs analog FE signals for focus control and tracking control. This circuit outputs a TE signal. Its internal configuration is as follows. Of the four analog signals input from the analog signal processing LSI 107, the main FE signal and the main TE signal are converted into digital signals by the A / D converters 110 and 112. Further, one of the remaining sub-FE signal and sub-TE signal is selected by the A / D conversion selector switch 113 and converted into a digital signal by the A / D converter 111 (first AD conversion means). Then, a digital signal processor (DSP) 115 which is a digital signal processing means in which the main FE signal, the main TE signal converted into a digital signal, and any one of the sub FE signal and the sub TE signal are subjected to digital signal processing. Is input. The DSP 115 includes a focus control processing unit 119, a tracking control processing unit 120, and two switches 117 and 118. The switches 117 and 118 are a sub FE signal changeover switch (focus error signal switching means) 117 for selecting transmission or cutoff of the sub FE signal, and a sub TE signal changeover switch (selection of transmission or cutoff of the sub TE signal). Tracking error signal switching means) 118, and when one transmits a signal, the other blocks the signal. That is, when the sub FE signal is selected by the A / D conversion selector switch 113, the sub FE signal selector switch 0117 is connected to the A / D converter 111, while the sub TE signal selector switch 118 is connected to the ground potential. The When the sub TE signal is selected by the A / D conversion selector switch 113, the sub FE signal selector switch 117 is connected to the ground potential, and the other sub TE signal selector switch 118 is connected to the A / D converter 111. The Of these four signals converted into digital signals by the operation of these switches, the main FE signal is input to the focus control processing unit (focus error signal generating means) 119, and the main TE signal is input to the tracking control processing unit (tracking error). When the sub FE signal is selected by the A / D conversion selector switch 113 and the sub FE signal is selected by the A / D conversion selector switch 113, the sub FE signal is input to the focus control processing unit 119. When the TE signal is selected, the sub TE signal is input to the tracking control processing unit 120. As a result, the focus control processing unit 119 that has received only two signals of the main FE signal and the sub FE signal or only the main FE signal has received the digital FE signal, and has received only the main TE signal, the sub TE signal, and the main TE signal. The tracking control processing unit 120 outputs a digital TE signal. Here, the selection of the sub-FE signal or the sub-TE signal is performed under the control of the control block 121. In other words, the A / D conversion selector switch 113, the sub FE signal selector switch 117, and the sub TE signal selector switch 118 are controlled by the control block (switch control means) 121, so that either the sub FE signal or the sub TE signal is detected. Selected. Further, the control block 121 also controls the A / D conversion command generation circuit. Based on this control, the A / D conversion operations of the A / D converters 110 to 112 are time-division controlled. Here, the focus control processing unit 0119 outputs a digital FE signal with the focus drive value calculated through the control filter, and the tracking control processing unit 120 outputs the digital with the tracking drive value calculated through the control filter. The TE signal is output. The digital FE signal and TE signal obtained from the DSP 115 are converted into analog signals by the D / A converters 123 and 124 provided on the output side, and input to the actuator 104 of the pickup 101. Based on the input analog FE signal and TE signal, the actuator 104 performs focus control of the focusing lens and tracking control of the condenser lens.

  In the above configuration, the control block 121 performs sub-FE signal and sub-TE signal selection control according to the presence or absence of tracking control (control state of the optical disk). Hereinafter, signal processing for the presence or absence of tracking control will be described.

  When the focus control is ON and the tracking control is OFF, the tracking control is not activated, so that the disturbance caused by the light spot crossing the track groove is larger than a predetermined value (the first predetermined value or more). Appear on the FE signal. In order to remove this disturbance, a sub-FE signal is used in digital signal processing. That is, by connecting the A / D conversion changeover switch 113 to the sub FE signal side (analog) and turning on the sub FE signal changeover switch 117 of the DSP 115, the sub FE signal (digital) and the main FE signal (digital) are used. An FE signal (digital) is generated and the disturbance is removed. At this time, since the tracking control is not operating, the sub TE signal changeover switch 118 is turned OFF.

  When the focus control is ON and the tracking control is ON, the tracking control is operating, and an offset greater than a predetermined value (an unnecessary signal greater than the second predetermined value) is added to the TE signal due to the lens shift. appear. In order to remove this offset, a sub TE signal is used in digital signal processing. That is, by connecting the A / D conversion changeover switch 113 to the sub TE signal side and turning on the sub TE signal changeover switch 118 of the DSP 115, the TE signal (digital) and the main TE signal (digital) are converted into the TE signal ( Digital) and remove the offset. At this time, the tracking control is operating, and the disturbance due to the crossing of the light spot groove does not appear on the FE signal, so the sub-FE signal selector switch 117 is turned OFF.

  Next, the switching process will be described with reference to the time chart of FIG.

  FIG. 5 is a time chart showing the A / D conversion processing 503 in the A / D converter and the DSP arithmetic processing 511 at the high speed when the tracking control is switched from the OFF state to the ON state in the high speed processing. It is.

  5A shows the tracking control state, FIG. 5B shows the A / D conversion process 503 in the A / D converter, and FIG. 5C shows the operation processing cycle at high speed. FIG. 6D shows DSP calculation processing 511 at high speed.

  When the focus control is ON and the tracking control is OFF, that is, when the tracking is OFF 501 in FIG. 5A, a signal processing cycle based on the main FE signal, the sub FE signal, and the main TE signal is executed, and FIG. Main FE processing 504, sub FE processing 505 and main TE processing 506 shown in the A / D conversion processing of FIG. 5, and three main FE processing 512, sub FE processing 513 and main processing shown in the DSP arithmetic processing of FIG. TE processing 514 is performed. At this time, an A / D conversion process 505 and a DSP calculation process 513 are performed on the sub-FE signal in order to remove the disturbance generated on the FE signal due to the crossing of the light spot groove. At this time, since tracking control is not operating, the A / D conversion process and the DSP calculation process for the sub TE signal are not performed.

  When the focus control is ON and the tracking control is ON, that is, when the tracking is ON 502 in FIG. 5A, a signal processing cycle based on the main FE signal, the main TE signal, and the sub TE signal is executed, and FIG. Main FE processing 507, main TE processing 508, and sub TE processing 509 shown in the A / D conversion processing of FIG. 5, and three main FE processing 515, main TE processing 516, and sub processing shown in the DSP arithmetic processing of FIG. TE processing 517 is performed. At this time, an A / D conversion process 509 and a DSP calculation process 517 are performed on the sub TE signal in order to remove the offset due to the lens shift appearing on the TE signal. At this time, the tracking control is operating, and the disturbance due to the light spot crossing the groove does not appear on the FE signal, so the A / D conversion process and the DSP calculation process for the sub FE signal are not performed.

  As described above, A / D conversion processing can be efficiently performed by selecting only one of the sub-FE signal and the sub-TE signal depending on whether the tracking control is on or off. In addition, by selecting only one of the sub-FE signal and the sub-TE signal according to the tracking control state and performing DSP arithmetic processing, it is not necessary to perform unnecessary error signal arithmetic processing. Can be contained within a predetermined cycle.

  In other words, in this embodiment, by selecting only necessary signals, unnecessary signal processing can be reduced, and A / D conversion and DSP arithmetic processing can be performed efficiently. Even if the processing cycle is shortened, it is possible to store the arithmetic processing within a predetermined cycle time using an LSI with conventional performance.

(Second Embodiment)
Next, a second embodiment of the present invention will be described with reference to FIGS.
FIG. 6 is a block diagram showing the configuration of the optical disc apparatus according to the second embodiment of the present invention. The optical disc apparatus of FIG. 6 extracts an optical disc information and converts it into an electrical signal, and an analog main focus error (main FE) signal and sub focus error (sub FE) from the electrical signal extracted by the pickup 601. An analog signal processing LSI 606 that detects four types of signals, a main tracking error (main TE) signal and a sub-tracking error (sub TE) signal, and the four types of analog signals processed by the analog signal processing LSI 606 The digital signal processing LSI 617 generates a focus signal and a tracking signal for focus control and tracking control by digital signal processing.

  In FIG. 6, a pickup 601 is composed of a laser diode (LD) 603, a photodiode (PD) 602, and an actuator 604. The reflected light emitted from the laser diode 603 to the optical disk is received by the photodiode 602 and received. Information recorded on the optical disk is extracted from the reflected light as an electric signal based on a current value. The electrical signal based on the extracted current value is converted into an electrical signal based on the voltage value by the I / V converter 605 and input to the analog signal processing LSI 606.

  The analog signal processing LSI 606 includes a focus error (FE) detection circuit 607, a tracking error (TE) detection circuit 608, and a multiplexer (MPX) 609, and an electric signal based on a voltage value input from the I / V converter 605. The focus error detection circuit 607 detects the main FE signal and the sub FE signal, and the tracking error detection circuit 608 detects the main TE signal and the sub TE signal. These four detected signals are input to the MPX 609 in parallel. An MPX (output signal switching means) 609 is a circuit that processes the four analog signals input in parallel in a time division manner and outputs them serially. This is mounted for the purpose of deleting the signal pins of the LSI. The analog output signal of the MPX 609 is input to the digital signal processing LSI 617.

  The digital signal processing LSI 617 digitally processes four signals including the input analog main FE signal, sub FE signal, main TE signal, and sub TE signal, and further performs focus control and tracking on the digitally processed signal. This is a circuit that converts and outputs analog FE signals and TE signals for control. Its internal configuration is as follows.

  The four serial analog signals input from the MPX 609 are converted into digital main FE signals, sub-FE signals, main TE signals, and sub-TE signals by the A / D converter 610 (second AD conversion means). The signal is input to the DSP 618 that performs signal processing. Here, in the present embodiment, the digital signal processing LSI 617 receives the signal serially, so that this 1 instead of the three A / D converters 110 to 112 used in the first embodiment. A / D can be performed using two A / D converters 610. Since the internal configuration and operation of the DSP 618 are the same as those of the DSP 115 shown in FIG. 1 in the first embodiment, the description thereof is omitted here. The digital FE signal and TE signal digitally processed by the DSP 618 are converted into analog FE signals and TE signals by A / D converters 615 and 616, respectively. The signal is input to the pickup 601 as a tracking control signal.

  Here, the time division processing control of the signal in the present embodiment is performed by the control block (switching control means) 614 as in the control of the control block 121 in the first embodiment. The function of the A / D conversion instruction generation circuit 611 that has received is different from that of the first embodiment. That is, in this embodiment, the A / D conversion command generation circuit 611 transmits a command signal to the MPX 609 and the A / D converter 610. By this command signal, the MPX 609 selects the main FE signal, the main TE signal, and either the sub FE signal or the sub TE signal with the MPX sub error changeover switch 619, so that the three The signal is serially output, and the A / D converter 610 performs A / D conversion on the three signals received from the MPX 609 and inputs the signals to the DSP 618 after time division processing.

  In the above configuration, the control block 614 performs selection control of the sub FE signal and the sub TE signal according to the presence or absence of tracking control. Hereinafter, signal processing for the presence or absence of tracking control will be described.

  When the focus control is ON and the tracking control is OFF, since the tracking control is not operated, a disturbance having a magnitude larger than a predetermined value caused by the light spot crossing the groove of the track appears on the FE signal. In order to remove this disturbance, the MPX sub error changeover switch 619 is connected to the sub FE signal side (analog), and the sub FE signal changeover switch (focus error signal changeover means) 620 of the DSP 618 is turned on to turn on the sub FE signal ( An FE signal (digital) is generated from the digital) and main FE signal (digital), and the disturbance is removed. At this time, since the tracking control is not operating, the sub TE signal changeover switch 621 is turned OFF.

  When the focus control is ON and the tracking control is ON, the tracking control is operating, and an offset greater than a predetermined value appears on the TE signal due to the lens shift. In order to remove this offset, the MPX sub error changeover switch 619 is connected to the sub TE signal side (analog), and the sub TE signal changeover switch (tracking error signal changeover means) 621 of the DSP 618 is turned on to turn on the sub TE signal ( A TE signal (digital) is generated from the digital) and the main TE signal (digital), and the offset is removed. At this time, the tracking control is operating, and disturbance due to the light spot crossing the groove does not appear on the FE signal, so the sub-FE signal changeover switch 620 is turned OFF.

  Next, the switching process will be described with reference to the time chart of FIG.

  FIG. 7 shows the time division transfer processing in the MPX 609 when the tracking control is switched from the OFF state to the ON state, and the arithmetic processing cycle and arithmetic processing 711 of the DSP 617 that can be placed at the high speed in the high speed processing. It is a chart.

  FIG. 7A shows a state where the tracking control is turned on or off, FIG. 7B shows time division transfer processing in the MPX 609, and FIG. 7C shows an arithmetic processing cycle of the DSP 618 at high speed. FIG. 5D shows the arithmetic processing 0711 of the DSP 618 at high speed.

  When focus control is ON and tracking control is OFF, that is, tracking OFF 701 in FIG. 7A, a signal based on the main FE signal, sub-FE signal, and main TE signal is used to remove disturbance on the FE signal. A processing cycle is executed, and three main FE processes 704, a sub-FE process 705, and a main TE process 706 shown in the time division transfer process of the MPX 609 in FIG. 7B, and the arithmetic process of the DSP 618 in FIG. Three main FE processes 712, a sub FE process 713, and a main TE process 714 are performed. Here, in order to remove the disturbance generated on the FE signal due to the crossing of the light spot groove, the sub-FE processing 705 and the arithmetic processing 713 are performed in the time division transfer processing. At this time, since tracking control is not operating, the time division transfer process and the DSP calculation process for the sub TE signal are not performed.

  When focus control is ON and tracking control is ON, that is, tracking ON 702 in FIG. 7A, a signal processing cycle based on the main FE signal, main TE signal, and sub TE signal is executed, and FIG. Main FE processing 707, main TE processing 708 and sub TE processing 709 shown in the time division transfer processing of the MPX 609, and three main FE processing 715, main TE processing 716 shown in the DSP arithmetic processing of FIG. Sub-TE processing 717 is performed. At this time, in order to remove the offset due to the lens shift appearing on the TE signal, the sub TE processing 709 and the DSP calculation processing 717 are performed in the time division transfer processing. At this time, the tracking control is operating, and the disturbance due to the crossing of the light spot groove does not appear on the FE signal. Therefore, the MPX time-division transfer process and the DSP calculation process for the sub-FE signal are not performed.

  Next, FIG. 8 is used to show the flow of switching the processing target of time division transfer by MPX and DSP calculation for the tracking ON or tracking OFF control state. In step 801, the tracking ON / OFF state is determined in step 802 in accordance with the switching of the tracking control. Here, in the case of tracking OFF, since the sub FE processing is necessary for the reason described above, the process proceeds to steps 803, 804, and 805, and main division processing, sub FE processing, main FE processing of time division by MPX and calculation by DSP are performed. TE processing is performed sequentially. On the other hand, if tracking control is ON, sub TE processing is required, so the process proceeds to steps 806, 807, and 808, where main division processing, main TE processing, and sub TE processing of time division by MPX and computation by DSP are performed. It is done sequentially. The flow from the tracking ON / OFF determination to the time division and calculation processing is repeated until the signal input is completed, and when the signal input is terminated, the termination determination is made in step 809 and the process ends (step 810). .

  As described above, time-division transfer processing can be efficiently performed by selecting only one of the sub-FE signal and the sub-TE signal depending on whether the tracking control is on or off. In addition, by selecting only one of the sub-FE signal and the sub-TE signal according to the tracking control state and performing DSP arithmetic processing, it is not necessary to perform arithmetic processing of error signals that are not used. Can be contained within a predetermined cycle.

  That is, in this embodiment, unnecessary signal processing can be reduced by selecting only necessary signals, and time division transfer processing and DSP arithmetic processing can be performed efficiently. Even if the processing cycle is shortened, it is possible to store the arithmetic processing within a predetermined cycle time using an LSI with conventional performance.

(Third embodiment)
Next, a third embodiment of the present invention will be described with reference to FIGS.
The configuration of the optical disc apparatus in the third embodiment of the present invention is the same as that of the optical disc apparatus shown in FIG. 6 in the second embodiment. In the second embodiment, the control block 614 in the digital signal processing LSI 617 switches between the sub FE signal and the sub TE signal according to the on / off state of the tracking control, but in this embodiment, the control block 614 614 switches between the sub-FE signal and the sub-TE signal according to the type of the physical layer on which the light spot is located in an area on the optical disk having layers with physically different states. That is, the sub FE signal changeover switch 620 and the sub TE signal changeover switch 621 are switched in accordance with the control state of the optical disc that picks up different physical layers.

  Hereinafter, control for switching between the sub-FE signal and the sub-TE signal in an optical disc having different physical layers will be described with reference to FIG.

  In the present embodiment, SACD (Super Audio Compact Disc) is used as an optical disc having different physical layers. The SACD is composed of a CD layer having the same physical layer as that of an existing CD and an HD layer having an information recording density 6 times that of the CD layer, and a track is formed by pits. The CD layer and the HD layer differ in track pitch (distance between adjacent tracks) and pit shape. The track pitch of the CD layer is 1.6 μm, and the HD layer is 0.7 μm.

  Since the CD layer is played back at high speed, a high frequency control band is required for signal processing. Since the processing in the CD layer is a high frequency cycle, the MPX sub error signal changeover switch 619 is connected to GND, the sub FE signal changeover switch 620 of the DSP 618 is turned off, and the sub TE signal changeover switch 621 is turned off. Focus control is performed using only the FE signal, and tracking control is performed using the main TE signal and the sub TE signal.

  At this time, the track of the CD layer is formed of pits, and the influence of the disturbance caused by the crossing of the light spot on the FE signal is smaller than a predetermined value, so the sub-FE signal is not used. Further, the offset to the TE signal due to the lens shift has a wide track pitch of the CD layer, and its influence is smaller than a predetermined value, so the sub TE signal is not used.

  In the HD layer, the MPX sub error signal selector switch 619 is switched to the sub TE signal, the sub TE signal selector switch 621 of the DSP 618 is turned on, focus control is performed using only the main FE signal, and the main TE signal and sub TE signal are also switched. Tracking control is performed using the signal.

  At this time, since the track of the HD layer is formed of pits, the sub-FE signal is not used because the influence of the disturbance caused by the crossing of the light spot on the FE signal is small. Further, the offset to the TE signal due to the lens shift uses the sub TE signal because the track pitch of the HD layer is narrow and its influence is large.

  Next, the switching process will be described with reference to the time chart of FIG.

  FIG. 9 shows a time chart of the arithmetic processing of the DSP 618 when the physical layer of the optical disk where the light spot is located moves from the CD layer 901 to the HD layer 903 in the high-speed processing.

  FIG. 9A shows a state where the position of the light spot moves from the CD layer 901 to the HD layer 903, and FIG. 9B shows processing of the DSP 618 for time-division data.

  In the CD layer 901, only the main FE signal 904 and the main TE signal 905 are subjected to time division transfer processing by the MPX 609 and arithmetic processing is performed by the DSP 618. In the sub-FE signal, the CD layer is composed of pits, and since the disturbance due to the crossing of the light spot generated on the FE signal is small, the time division transfer process and the arithmetic process are not performed. In addition, since the sub TE signal has a wide track pitch of the CD layer, the offset due to the lens shift generated on the TE signal is small, so that the time division transfer process and the arithmetic process are not performed.

  In the HD layer 903, only the main FE signal 906, the main TE signal 907, and the sub TE signal 908 are subjected to time division transfer processing by the MPX 609 and arithmetic processing by the DSP 618. The sub-FE signal is not subjected to time-division transfer processing and arithmetic processing because the HD layer is composed of pits and the disturbance due to the crossing of the light spot generated on the FE signal is small. Since the sub-TE signal has a very narrow track pitch in the HD layer and a large offset to the TE signal due to lens shift, time division transfer processing and arithmetic processing are performed.

  FIG. 10 shows a flow in which the processing target of the time division transfer by MPX and the DSP calculation is switched with respect to the movement of the light spot between the CD layer and the HD layer on the optical disc on which the CD layer and the HD layer are formed. It is the flowchart which showed. When the interlayer movement between the CD layer and the HD layer occurs in step 1001, it is determined in step 1002 which layer is the CD layer or the HD layer. Here, when the light spot is located on the CD layer, the sub-FE process and the sub-TE process are not necessary for the above-described reason. Therefore, the process proceeds to Steps 1003 and 1004, and the main FE for time division by MPX and calculation by DSP. Processing and main TE processing are sequentially performed. On the other hand, if the light spot is located in the HD layer, sub-TE processing is required, so the process proceeds to steps 1005, 1006, and 1007, and main FE processing, main TE processing, sub-processing by MPX time division and DSP are performed. TE processing is performed sequentially. The flow from the determination of the CD layer / HD layer to the time division and calculation processing is repeated until the input of the signal is completed. When no signal is input, the end determination is made in step 1008, and the process ends (step 1009). To do.

  As described above, time division transfer processing can be efficiently performed by selecting only necessary signals from the sub FE signal and sub TE signal and performing time division transfer processing according to different physical layers. Also, according to different physical layers, only necessary signals are selected from the sub-FE signal or sub-TE signal, and DSP calculation processing is performed, so that unnecessary error signal calculation processing can be eliminated, and processing is increased. It is possible to fit within a specified cycle of double speed.

  In other words, in the present embodiment, only necessary signals can be selected according to the physical layer of the optical disc to be reproduced, and the time division transfer processing and the arithmetic processing can be performed efficiently. Even if the processing cycle is shortened, it is possible to keep the arithmetic processing within a predetermined time cycle using an LSI having conventional performance.

(Fourth embodiment)
Next, a fourth embodiment of the present invention will be described with reference to FIGS.
The configuration of the optical disk device in the present embodiment is the same as that of the optical disk device shown in FIG. 6 in the second embodiment. In the second embodiment, the control block 614 in the digital signal processing LSI 617 switches between the sub FE signal and the sub TE signal according to the on / off state of the tracking control, but in this embodiment, the control block 614 614 switches between the sub-FE signal and the sub-TE signal according to the physical region where the light spot is located in regions on the optical disk that are physically different in state. That is, the sub FE signal changeover switch 620 and the sub TE signal changeover switch 621 are switched in accordance with the control state of the optical disc that picks up different physical areas.

  Hereinafter, control for switching between the sub-FE signal and the sub-TE signal in an optical disk having different physical areas will be described with reference to FIG.

  In the present embodiment, a DVD-RAM disc is used as an optical disc having different physical areas on the same recording surface. The DVD-RAM includes two areas, an emboss area and a rewritable area. The embossed area is an area where information unique to the disc is recorded, and the physical characteristics are formed by pits equal to those of the DVD-RAM. On the other hand, the rewritable area is an area where data can be rewritten, and the disk surface is formed by concave tracks and convex tracks, which are called land / groove tracks.

  Since the embossed region is formed by pits having no groove, a disturbance that occurs when the light spot crosses the groove has a small influence when the tracking is OFF. Therefore, it is not necessary to use the sub FE signal, the MPX sub error signal changeover switch 619 is connected to the sub TE signal, the sub FE signal changeover switch 620 of the DSP 618 is turned off, and the sub TE signal changeover switch 621 is turned on to turn on the sub. MPX transfer of FE signals and arithmetic processing are not performed. In this way, in the embossed region where the influence of disturbance due to the groove crossing is small, focus control is performed only by the main FE signal, and tracking control is performed by the main TE signal and the sub TE signal.

  In the rewritable region, the track is formed by lands and grooves, and the disturbance generated when the light spot crosses the groove has a great influence when the tracking is OFF. Therefore, it is necessary to use the sub FE signal when the focus is turned on. The MPX sub error signal changeover switch 619 is connected to the sub FE signal, the sub FE signal changeover switch 620 of the DSP 618 is turned on, and the sub TE signal changeover switch 621 is turned on. Turn off and do not perform MPX transfer of sub TE signal and DSP calculation processing. In this way, when the focus is turned on in the rewritable region where the disturbance due to the groove crossing is large, the main FE signal and the sub FE signal are used.

  FIG. 11 shows a time chart of the arithmetic processing in the DSP 618 when the light spot moves from the embossed area 1101 to the rewritable area 1102. FIG. 11A shows the movement from the embossed area 1101 to the rewritable area 1102, and FIG. 11B shows the arithmetic processing by the DSP in the embossed area and the rewritable area, corresponding to FIG.

  In the embossed area 1101, only the main FE signal, main TE signal, and sub TE signal are time-division transferred by MPX0609, and the DSP 618 performs arithmetic processing of the main FE processing 1104, main TE processing 1105, and sub TE processing 1106. The embossed area is composed of pits, and since the disturbance due to the crossing of the light spot generated on the FE signal is small, the sub-FE signal is not necessary, and the time-division transfer process and the arithmetic process are not performed.

  When moving to the rewritable area 1102, only the main FE signal, the sub FE signal, and the main TE signal are time-division transferred by the MPX 609, and the DSP 618 performs the arithmetic processing of the main FE processing 1107, the sub FE processing 1108, and the main TE processing 1109. Do. The rewritable area is composed of lands and grooves, and a sub-FE signal is necessary because of the large disturbance caused by the crossing of the light spot on the FE signal, and time division transfer processing and arithmetic processing are performed. At this time, since the tracking control is not operating, the sub-TE signal is not subjected to time division transfer processing or arithmetic processing.

  FIG. 12 shows a flow in which, in an optical disc having different physical areas, an embossed area and a rewritable area, the processing target of time division transfer by MPX and DSP calculation processing is switched with respect to movement of a light spot between these different physical areas. FIG. In step 1202, it is determined which area is an embossed area or a rewritable area. Here, when the light spot is located in the embossed area, the sub-FE process and the sub-TE process are not necessary for the above-described reason, so the process proceeds to steps 1203 and 1204, where the main FE of time division by MPX and calculation by DSP is performed. Processing and main TE processing are sequentially performed. On the other hand, if the light spot is located in the rewritable area, sub-TE processing is required, so the process proceeds to steps 1205, 1206, and 1207, and main division processing using MPX, main FE processing, main TE processing, TE processing is performed sequentially. The flow from the determination of the embossed area / rewritable area to the time division and calculation processing is repeated until the signal input is completed. When the signal input is terminated, the termination determination is made at step 809, and the process ends (step 1209). To do.

  As described above, the time division transfer process can be efficiently performed by selecting only necessary sub-FE signals and sub-TE signals according to different physical areas. Further, the DSP 618 can select only the necessary sub-FE signal and sub-TE signal according to different areas, so that it is not necessary to perform processing of error signals that are not used. be able to.

  In other words, in the embodiment of the present invention, the time division transfer process and the arithmetic process can be efficiently performed by selecting only the necessary signals according to the area to be reproduced. Even if this cycle is shortened, the processing can be stopped within a cycle of a predetermined time using an LSI having the conventional performance.

(Embodiment 5)
Hereinafter, Embodiment 5 of the present invention will be described with reference to FIGS. 13 and 14.
The configuration of the optical disk apparatus in the fifth embodiment of the present invention is the same as that of the optical disk apparatus shown in FIG. 6 in the second embodiment. In the second embodiment, the control block 614 in the digital signal processing LSI 617 switches between the sub FE signal and the sub TE signal in accordance with the tracking control state. However, in the present embodiment, the control block 614 in the digital signal processing LSI 617 The control block 0614 switches between the sub FE signal and the sub TE signal in accordance with reproduction or recording (control state of the optical disk).

  Hereinafter, control for switching between the sub-FE signal and the sub-TE signal during reproduction or recording will be described with reference to FIG.

  At the time of reproduction, a disturbance is placed on the FE signal due to the crossing of the light spot groove, so it is necessary to use the sub FE signal, and an offset is placed on the TE signal due to the lens shift, so the sub TE signal is used. There is a need to. Therefore, the MPX sub error signal selector switch 619 is sequentially switched between the sub FE signal and the sub TE signal, the sub FE signal selector switch 620 of the DSP 618 is turned on, the sub TE signal selector switch 621 is turned on, and the sub FE signal and the sub TE signal are switched. Perform MPX transfer and DSP arithmetic processing.

  At the time of recording, it is necessary to perform laser power control processing (LPC), and an item to be arithmetically processed by the DSP 618 is added. However, at the time of recording, the tracking control is not turned off, so the sub-FE signal is not necessary. Therefore, the MPX sub error signal changeover switch 619 is connected to the input side of the sub TE signal, the sub FE signal changeover switch 620 of the DSP 618 is turned off, the sub TE signal changeover switch 621 is turned on, and MPX transfer of only the sub TE signal and DSP arithmetic processing I do.

  FIG. 13 shows a time chart of the arithmetic processing of the DSP 618 for the signal time-division processed by the MPX 609 during reproduction and recording. FIG. 13A shows a transition from the reproduction process 1301 to the recording process 1302, and FIG. 13B shows a state in which the arithmetic processing of the DSP 618 is switched along with the transition.

  As shown in FIG. 13, during reproduction, the main FE signal, the sub FE signal, the main TE signal, and the sub TE signal are time-division transfer processed by the MPX 609, and these signals are processed by the DSP 618 in the main FE processing and sub FE processing main. Calculation processing of TE processing and sub TE processing is performed. On the FE signal, since a disturbance is caused by the crossing of the light spot groove, a sub-FE signal is necessary, and MPX609 time division transfer processing and DSP 618 arithmetic processing are performed. Further, since the TE signal has an offset in the TE signal due to lens shift, a sub TE signal is necessary, and time division transfer processing and DSP arithmetic processing by the MPX 609 are performed.

  At the time of recording, the main FE signal, the main TE signal, and the sub TE signal are subjected to time division transfer processing by the MPX 609, and these signals are arithmetically processed by the DSP 618.

  In addition to this, it is necessary to perform a laser power control process 1310 at the time of recording. This process is incorporated in the time division process, and as shown in FIG. 13B, a main FE process 1308, a sub FE process 1309, a main The TE processing 1310 and the LPC processing 1311 are subjected to DSP arithmetic processing. Further, since the tracking control is not turned off during recording, no sub-FE signal is required, and time-division transfer processing and calculation processing of the sub-FE signal are not performed.

  FIG. 14 is a flowchart showing a flow in which the processing target of the time division transfer by MPX and the calculation of DSP is switched with respect to the reproduction or recording processing state of the optical disc apparatus. In step 1402, it is determined whether the process is a reproduction process or a recording process. Here, when the reproduction process is performed, both the sub-FE process and the sub-TE process are necessary for the above-described reason. Therefore, the process proceeds to steps 1403, 1404, 1405, and 1406, and time division by MPX and calculation by DSP are performed. The main FE process, the sub FE process, the main TE process, and the sub TE process are sequentially performed. On the other hand, when the recording process is performed, the sub TE process and the LPC process are necessary. Therefore, the process proceeds to steps 1407, 14081, 1409, and 1410, and the main FE process and main TE process of time division by MPX and calculation by DSP are performed. And LPC processing are sequentially performed. The flow from the determination of the reproduction / recording process to the time division and calculation process is repeated until the signal input is completed. When the signal input is terminated, the termination determination is made at step 1411 and the process ends (step 1412). .

  As described above, a laser power control process (LPC) 1311 is added at the time of recording, but only the required sub TE signal is selected from the sub FE signal or the sub TE signal, and time division transfer is performed. By performing DSP arithmetic processing, it is not necessary to perform unnecessary error signal arithmetic processing, so that even within recording, it can be accommodated within a cycle of a specified time of high speed.

  In other words, in the embodiment of the present invention, it is possible to efficiently perform time-division transfer processing and arithmetic processing by selecting only necessary signals according to playback or recording. Even when the processing cycle is shortened, the arithmetic processing can be performed within a predetermined time cycle using an LSI with conventional performance.

  The optical disk device and the control method and control device according to the present invention can reduce the arithmetic processing cycle accompanying the increase in speed to keep the arithmetic processing within a predetermined cycle time using an LSI with conventional performance. By doing so, there is no need to use a high-performance DSP, and there is an effect that cost reduction and low power consumption can be realized, focus control is performed using a main focus error signal and a sub focus error signal, This is useful in applications such as an optical disc apparatus that performs tracking control using a main tracking error signal and a sub-tracking error signal, and a control apparatus and control method thereof.

1 is a block diagram showing a configuration of an optical disc device according to a first embodiment of the present invention. It is a block diagram of the optical disk apparatus of a prior art example. It is the figure which showed the effect | action of the sub FE signal and the sub TE signal in a prior art example. (A) is a figure which shows the arithmetic processing cycle in a prior art example (low speed), the figure (b) is a figure which shows DSP arithmetic processing in a prior art example, and the figure (c) is a figure which shows the arithmetic processing cycle at the time of high speed. FIG. 4D is a time chart showing a conventional DSP calculation process at high speed. (A) in the first embodiment of the present invention is a diagram showing a tracking control state, FIG. (B) is a diagram showing an A / D conversion process for the tracking control state, and (c) in FIG. The figure which shows an arithmetic processing cycle, and the figure (d) are the time chart figures which showed DSP arithmetic processing at the time of high double speed. It is a block diagram which shows the structure of the optical disk apparatus in the 2nd, 3rd, 4th and 5th embodiment of this invention. (A) in the second embodiment of the present invention is a diagram showing a tracking control state, (b) is a diagram showing MPX transfer processing for the tracking control state, and (c) is an arithmetic processing at high speed. The figure which shows a cycle, and the figure (d) are the time chart figures which showed DSP calculation processing at the time of high double speed. It is a flowchart which shows the control of arithmetic processing switching in the 2nd Embodiment of this invention. (A) in the 3rd Embodiment of this invention is an inter-layer movement time chart figure of a different physical layer, and the same figure (b) is a time chart figure which shows DSP arithmetic processing with respect to an inter-layer movement. It is a flowchart which shows the control of arithmetic processing switching in the 3rd Embodiment of this invention. (A) in the 4th Embodiment of this invention is the time chart figure between area | region movements of a different physical area | region, The figure (b) is a time chart figure which shows the DSP arithmetic processing with respect to movement between areas | regions. It is a flowchart which shows the control of arithmetic processing switching in the 4th Embodiment of this invention. (A) in the fifth embodiment of the present invention is a time chart showing the transition of the state of reproduction and recording processing, and (b) is a time chart showing the DSP arithmetic processing for the processing state of reproduction and recording. It is. It is a flowchart which shows the control of arithmetic processing switching in the 5th Embodiment of this invention.

Explanation of symbols

107, 206, 606 Analog signal processing LSI
108, 207, 607 Focus error signal detection circuit 109, 208, 608 Tracking error signal detection circuit 110, 112, 210 A / D converter 111 A / D converter (first A / D converter)
610 A / D converter (second A / D converter)
113 A / D conversion switch 114, 217, 617 Digital signal processing LSI
115, 218, 618 Digital signal processor, DSP (digital signal
Processing means)
117, 620 Sub FE signal changeover switch (focus error signal changeover)
means)
118, 621 Sub TE signal selector switch (tracking error signal off
Alternative means)
119, 212, 612 Focus control processing unit (focus error signal generating means)
120, 213, 613 Tracking control processing unit (tracking error signal generation
means)
121, 214, 614 Control block (switching control means)
122, 211, 611 A / D conversion instruction generation circuits 123, 124, 215,
216, 615, 616 D / A converters 209, 609 MPX (output signal switching means)

Claims (21)

A signal obtained from an optical disc, which is a main focus error signal and a sub focus error signal for removing unnecessary signals included in the main focus error signal, and an unnecessary signal included in the main tracking error signal and main tracking error signal are removed. In a control device for an optical disc apparatus that performs focus control and tracking control of the optical disc using an optical pickup signal including a sub-tracking error signal for
Focus error signal generating means for generating a focus error signal from two signals of the main focus error signal and the sub focus error signal or only from the main focus error signal;
Tracking error signal generating means for generating a tracking error signal from two signals of the main tracking error signal and the sub-tracking error signal or only from the main tracking error signal;
Focus error signal switching for switching between two signals, the main focus error signal and the sub focus error signal, and a case where only the main focus error signal is input as the signal to be input to the focus error signal generating means Means,
Tracking error signal switching for switching between two signals, the main tracking error signal and the sub-tracking error signal, and a case where only the main tracking error signal is input as the signal input to the tracking error signal generating means Means and
A control apparatus for an optical disc apparatus, comprising: a switching control means for switching the focus error signal switching means and the tracking error signal switching means according to a control state of the optical disc. The control apparatus for an optical disc apparatus according to claim 1,
The focus error signal switching means also controls the focus error signal to include the sub focus error signal when the unnecessary signal of a first predetermined value or more is superimposed on the main focus error signal as the control state of the optical disc. Input to the generator, switch the signal,
The tracking error signal switching means also includes the sub-tracking error signal as the tracking error signal when an unnecessary signal of a second predetermined value or higher is superimposed on the main tracking error signal as a control state of the optical disc. A control device for an optical disc apparatus, wherein the signal is input to the generating means and the signal is switched. The control device for an optical disk device according to claim 2,
Comprising digital signal processing means for performing digital signal processing;
The control apparatus for an optical disc apparatus, wherein the digital signal processing means includes the focus error signal generation means, the tracking error signal generation means, the focus error signal switching means, and the tracking error signal switching means. In the control device of the optical disk device according to claim 1, 2, or 3,
Comprising at least one first AD converting means for converting the sub focus error signal or the sub tracking error signal into a digital signal;
The focus error signal switching unit and the tracking error signal switching unit switch a digital signal after AD conversion by the first AD conversion unit. In the control device of the optical disk device according to claim 1, 2, or 3,
An output signal switching means for performing time-division multiplexing output by sequentially switching the analog main focus error signal based on the optical pickup signal, the sub focus error signal, the main tracking error signal, and the sub tracking error signal,
A second AD conversion means for sequentially converting the analog main and sub four error signals time-division multiplexed by the output signal switching means into four digital signals;
The control apparatus for an optical disc apparatus, wherein the focus error signal switching unit and the tracking error signal switching unit switch an output signal of the second AD conversion unit. The control apparatus for an optical disc apparatus according to claim 1,
The focus error signal switching means switches so as to input only the main focus error signal as a signal to be input to the focus error signal generating means when the optical disk is in a control state in which the tracking control is turned on. When the tracking control is off, switching is performed so that two signals of the main focus error signal and the sub focus error signal are input. In the control device of the optical disk device according to claim 1 or 6,
The tracking error signal switching means switches so as to input only the main tracking error signal as a signal to be input to the tracking error signal generating means when the optical disc is in a control state in which the tracking control is turned off. When the control is on, switching is performed so that the two signals of the main tracking error signal and the sub tracking error signal are input. The control apparatus for an optical disc apparatus according to claim 1,
The focus error signal switching means is in a control state of the optical disc when a light spot for the optical pickup with respect to the optical disc in which a recording area is formed by a plurality of different physical layers moves between the plurality of physical layers. The signal input to the focus error signal generating means is switched between the case where the two signals of the main focus error signal and the sub focus error signal are input and the case where only the main focus error signal is input. A control device for an optical disk device. The control device for an optical disk device according to claim 1 or 8,
The tracking error signal switching unit is in a control state of the optical disc when a light spot for the optical pickup with respect to the optical disc in which a recording area is formed by a plurality of different physical layers moves between the plurality of physical layers. The signal input to the tracking error signal generating means is switched between the case where the two signals of the main tracking error signal and the sub tracking error signal are input and the case where only the main tracking error signal is input. A control device for an optical disk device. The control apparatus for an optical disc apparatus according to claim 1,
The focus error signal switching means provides the focus error signal generating means when the optical spot for the optical pickup with respect to the optical disk having a different physical area moves to another physical area in the control state of the optical disk. A control apparatus for an optical disc apparatus, wherein the input signal is switched between the case where two signals of the main focus error signal and the sub focus error signal are input and the case where only the main focus error signal is input. In the control device of the optical disk device according to claim 1 or 10,
The tracking error signal switching means provides the tracking error signal generating means when the optical spot for the optical pickup for the optical disk having a different physical area moves to another physical area in the control state of the optical disk. A control device for an optical disc apparatus, wherein the input signal is switched between a case where two signals of the main tracking error signal and the sub tracking error signal are inputted and a case where only the main tracking error signal is inputted. A control device for an optical disc device according to claim 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 or 11, comprising recording information on the optical disc or reproducing recorded information on the optical disc. An optical disc apparatus characterized by the above. A signal obtained from an optical disc, which is a main focus error signal and a sub focus error signal for removing unnecessary signals included in the main focus error signal, and an unnecessary signal included in the main tracking error signal and main tracking error signal are removed. In a control method of an optical disc apparatus for performing focus control and tracking control of the optical disc using an optical pickup signal including a sub-tracking error signal for
A first step of generating a focus error signal from the two signals of the main focus error signal and the sub focus error signal or only from the main focus error signal;
A second step of generating a tracking error signal from two signals, the main tracking error signal and the sub-tracking error signal, or only from the main tracking error signal;
In the first step, a third step of switching a signal to be used when using two signals of the main focus error signal and the sub focus error signal and using only the main focus error signal;
In the second step, a fourth step of switching a signal to be used when using two signals of the main tracking error signal and the sub-tracking error signal and using only the main tracking error signal;
And a step of switching signals in the third and fourth steps according to the control state of the optical disc. 14. The method of controlling an optical disk device according to claim 13,
The control state of the optical disc, the tracking control is turned on;
Turning off the tracking control;
Generating the focus error signal without using the subfocus error signal when the tracking control is turned on;
And a step of generating the focus error signal using the sub-focus error signal when the tracking control is turned off. The method of controlling an optical disk device according to claim 13 or 14,
Setting the tracking control to an on state of the optical disc;
Turning off the tracking control;
Generating the tracking error signal without using the sub-tracking error signal when the tracking control is turned off;
And a step of generating the tracking error signal using the sub-tracking error signal when the tracking control is turned on. 14. The method of controlling an optical disk device according to claim 13,
Setting the control state of the optical disk to a state in which a light spot for the optical pickup for the optical disk formed by a plurality of physical layers having different recording areas moves to the different physical layers;
And a step of generating the focus error signal without using the sub-focus error signal when the light spot is moved between the layers. The method of controlling an optical disk device according to claim 13 or 16,
Setting the control state of the optical disc to a state in which a light spot for the optical pickup for the optical disc formed by a plurality of physical layers having different recording areas moves to the different physical layers;
And a step of generating the tracking error signal without using the sub-tracking error signal when the light spot is moved between the layers. 14. The method of controlling an optical disk device according to claim 13,
Setting the control state of the optical disc to a state in which a light spot for the optical pickup for the optical disc having a different physical area moves to another physical area;
And a step of generating the focus error signal without using the sub-focus error signal when the light spot is moved to the other physical area. The method of controlling an optical disk device according to claim 13 or 18,
Setting the control state of the optical disc to a state in which a light spot for the optical pickup for the optical disc having a different physical area moves to another physical area;
And a step of generating the tracking error signal without using the sub-tracking error signal when the light spot is moved to the other physical region. 14. The method of controlling an optical disk device according to claim 13,
Switching the control state of the optical disc from a playback state to a recording state;
A step of switching from the recording state to the reproduction state;
Generating the focus error signal without using the subfocus error signal during recording;
And a step of generating the focus error signal using the subfocus error signal during reproduction. The method of controlling an optical disc device according to claim 13 or 20,
Switching the control state of the optical disc from a playback state to a recording state;
A step of switching from the recording state to the reproduction state;
Generating the tracking error signal using the sub-tracking error signal at the time of recording;
And a step of generating the tracking error signal using the sub-tracking error signal at the time of reproduction.

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