CN1371094A - Control system and method for controlling CD drive carrier - Google Patents

Abstract

A control system and method for controlling a carrier of an optical disk drive using a stepping motor. The CD machine has a reading head of the objective lens carrier, and the CD machine comprises a control system which comprises a tracking actuating controller, a digital controller, a frequency converter and a periodic sine/cosine wave generator, wherein the tracking actuating controller receives a tracking signal and generates a tracking control signal according to the tracking signal to control the position of the objective lens of the reading head, the digital controller receives the tracking control signal and generates a digital control signal, the frequency converter receives the digital control signal and generates a pulse characteristic bit signal and a direction characteristic bit signal, and the periodic sine/cosine wave generator receives the pulse characteristic bit signal and the direction characteristic bit signal and generates a carrier control signal for driving a stepping motor of the CD machine to control the carrier of the CD machine.

Description

Control system and method for controlling carrier of optical disc drive

The invention relates to a CD drive control system and its method, in particular to a control system and method for controlling the carrier of the CD drive by using a stepping motor.

In recent years, due to the rapid development of semiconductor technology and the rapid development of optoelectronic technology, related optoelectronic devices have gradually become standard and necessary peripheral devices for computer systems. With regard to optical disc drive products, in addition to the earlier CD-ROM, related products such as CD-R, CD-R/W and DVD are gradually being widely used. As far as the optical disc drive system is concerned, whether it is CD-ROM, CD-R, CD-R/W or DVD, etc., because the speed requirements are getting faster and faster, and the accuracy of the data is required at the same time, the stability of the optical disc drive It is very important in the carrier control method of the optical disc player to operate quickly and ensure that the signal can be read correctly.

In the carrier control method of the CD player, the control of the motor is very important. Since the driving mechanism of the stepping motor is relatively simple and the cost is relatively low, compared with the design of control circuits such as DC motor drive, optical detection feedback and magnetic detection feedback, are relatively simple. Therefore, some CD player manufacturers gradually introduce stepping motors as motors for Sled Control, replacing traditional DC motors.

Referring to FIG. 1 , FIG. 1 is a schematic diagram of a control system 11 commonly used in an optical disc drive 3 . The optical disk drive 3 includes a pickup head 6 , a DC motor 4 , and a control system 11 . The read head 6 includes an objective lens 9 and a carrier 5 . The control system 11 includes a tracking actuator controller 1 and a digital controller 2 . When moving the pick-up head 6 to read the data of a disc 8, the optical disc drive 3 will generate a tracking signal. The tracking signal is input to the tracking actuation controller 1 , and the tracking actuation controller 1 generates a tracking control signal (TRO) according to the tracking signal to control the position of the objective lens 9 of the read head 6 . The tracking control signal (TRO) is input to the digital controller 2 to generate a digital control signal (DCV). The digital control signal is used to drive the DC motor 4 to drive the carrier 5 of the read head 6 to move the read head 6 . This kind of common technology is not easy to cross the track at high speed, and because of the uneven frictional resistance of sliding, it will cause troubles in production.

In view of the disadvantages of the above-mentioned common technologies, the present invention provides a control system and method for controlling the carrier of an optical disc drive by using a stepping motor, so as to solve the above-mentioned problems.

To achieve the stated object, the present invention provides a method for controlling a carrier of an optical disc drive, which includes: (a) moving a pickup head of the optical disc drive to generate a tracking signal, wherein the pickup head includes The carrier and an objective lens; (b) inputting the tracking signal into the tracking actuator controller of the optical disc drive to generate a tracking control signal (TRO) for controlling the position of the objective lens of the pickup head; ( c) inputting the tracking control signal into the digital controller of the optical disc drive to generate a digital control signal (DCV); (d) inputting the digital control signal into the frequency converter of the optical disc drive to generate a pulse flag signal (Pulse) and a direction flag signal (Dir); (e) input the pulse flag signal and the direction flag signal into the periodical sine/cosine wave generator of the optical disc drive to generate a carrier control signal, the The carrier control signal is used to drive the stepping motor of the optical disc player to control the carrier of the optical disc player.

The optical disc drive includes the control system to implement the control method. The control system uses a stepping motor to control the carrier of the optical disc drive. The optical disc drive includes a pickup head, and the pickup head includes an objective lens and the carrier. The control system includes a tracking actuator controller, which is used to receive a tracking signal (TE) and generate a tracking control signal (TRO) according to the tracking signal to control the position of the objective lens of the read head; a digital control A device connected to the tracking actuator controller for receiving the tracking control signal to generate a digital control signal; a frequency converter connected to the digital controller for receiving the digital control signal to generate a pulse flag signal and a direction flag signal; a periodic sine/cosine wave generator connected to the frequency converter for receiving the pulse flag signal and the direction flag signal to generate a carrier control signal. The carrier control signal is used to drive the stepping motor of the optical disc player to control the carrier of the optical disc player.

In order to further understand the features and advantages of the present invention, the following will be described in detail in conjunction with the accompanying drawings.

FIG. 1 is a connection diagram of a carrier signal drive block of a common technology.

FIG. 2 is a schematic diagram of circuit block connections according to an embodiment of the present invention.

FIG. 3 is a schematic diagram of the internal circuit block connections of the controller and the digital controller of the tracking actuator in the embodiment of the present invention.

FIG. 4 is a schematic diagram of connection of main circuit blocks when performing tracking control in an embodiment of the present invention.

FIG. 5 is a schematic diagram of internal functions of a voltage-to-frequency converter when tracking control is performed in an embodiment of the present invention.

FIG. 6 is a schematic diagram of an internal comparison table of a periodic sine/cosine wave generator in tracking control according to an embodiment of the present invention.

FIG. 7 is a schematic diagram of connection of main circuit blocks when performing short-distance cross-track control in an embodiment of the present invention.

FIG. 8 is a schematic diagram of connection of main circuit blocks when performing long-distance cross-track control in an embodiment of the present invention.

9 is a schematic diagram of the operation flow of the speed curve generator and the speed-to-frequency converter in the long-distance cross-track control according to the embodiment of the present invention.

Fig. 10 is a characteristic diagram of the speed curve of the speed curve generator in the long-distance cross-track control of the embodiment of the present invention.

In a preferred embodiment of the present invention, with reference to the circuit diagram of Fig. 2, the main control circuit system includes: a tracking actuation controller 110, a digital controller 120, a frequency converter 130 and a periodic sine/cosine wave generation device 140. The tracking actuation controller 110 is used for receiving a tracking signal, and generating a tracking control signal (TRO) according to the tracking signal, so as to control the position of the objective lens 90 in the read head 60 . The digital controller 120 is connected to the controller 110 of the tracking actuator for receiving a tracking control signal (TRO) to generate a digital control signal (DCV) 131 . The frequency converter 130 is connected to the digital controller 120 for receiving the digital control signal (DCV) 131 to generate a pulse flag signal (Pulse) 135 and a direction flag signal (Dir) 136 . The periodic sine/cosine wave generator 140 is connected to the frequency converter 130 for receiving the pulse flag signal 135 and the direction flag signal 136 to generate carrier control signals (SLED 1) 170, (SLED 2) 180. The function of the carrier control signals 170 and 180 is to drive the carrier motor 40 of the optical disc player. Preferably, in the present invention, it is a stepping motor, especially a micro-stepping motor, so as to control the movement of the carrier 65 of the optical disc drive.

With reference to the circuit system of FIG. 2, the method for controlling the carrier of the optical disc drive of the present invention includes: (a) moving the pickup head 60 of the optical disc drive to generate a tracking signal, wherein the pickup head 60 includes a carrier 65 and an objective lens 90; b) input the tracking signal into the tracking actuator controller (tracking actuator'scontroller) 110 of the CD player to generate a tracking control signal (TRO) for controlling the position of the objective lens 90 of the pickup head 60; (c ) Input the tracking control signal into the digital controller 120 of the CD player to generate a digital control signal (DCV) 131; (d) input the digital control signal into the frequency converter 130 of the CD player to generate a pulse flag signal 135 and a direction flag signal 136; (e) input the pulse flag signal 135 and the direction flag signal 136 into the periodic sine/cosine wave generator 140 of the optical disc drive to generate a first carrier signal (SLED 1) 170 and A second carrier signal (SLED 2) 180 is used to drive the carrier motor 40 of the CD player (an embodiment of the present invention is a stepping motor) to control the movement of the carrier 65 of the CD player.

In the embodiment of the present invention shown in Fig. 2, also comprise a motor selector (DCM) 160 and coordinate motor selector 160 to set up a DC motor in addition, when motor selector 160 is set to a DC motor mode, then digital The digital control signal 131 produced by the controller 120 will be directly used to drive the DC motor of the optical disc player to control the movement of the carrier 65 of the optical disc player; and when the motor selector 160 is set to the stepping motor mode, the digital control The signal 131 is then input into the frequency converter 130 .

For the periodic sine/cosine wave generator 140, a periodic sine/cosine wave table (Ring Table) is included, and the periodic sine/cosine wave generator 140 can find out according to the periodic sine/cosine wave table A sine value and a cosine value corresponding to the pulse flag signal 135 and the direction flag signal 136 are used as carrier control signals (SLED 1) 170, (SLED 2) 180 respectively. The signals related to the sine and cosine output by the periodic sine/cosine wave generator 110 can be connected through the attenuator (Ks) 150 to adjust the amplitude of the sine and cosine, so that the control system of the present invention can enter power saving mode. The carrier control signal (SLED 1) 170, (SLED 2) 180 signal can be connected to the carrier motor 40 after first being connected to the power driver 20 for adjustment.

For further description of the tracking actuation controller 110 and digital control 120 disclosed in FIG. 2 , refer to FIG. 3 . As shown in Figure 3, wherein the tracking actuation controller 110 includes a tracking controller (Tracking Controller) 112, a short-distance cross-track controller (Short Seek Controller) 114 and a central error controller (Central error Controller) 116. The output terminals of the three controllers 112, 114, 116 can be selected, which means that the tracking control signal (TRO) output by the tracking actuation controller 110 can be selected by the three controllers 112, 114, 116 One of the connected outputs. The numerical controller 120 includes a carrier controller (Sled Controller) 122 and a speed profile generator (Speed Profile Generator) 124 . The output terminals of the carrier controller 122 and the speed curve generator 124 can be selected, which means that the digital control signal (DCV) 131 output by the digital controller 120 can be selected by the carrier controller 122 or the speed curve generator. 124 output connected to the output.

Referring to FIG. 4, when the optical disc player is in the tracking control mode, the tracking signal is a tracking error signal (TE), and the frequency converter 130 is a voltage-to-frequency converter. The tracking signal (TE) signal is input into the tracking controller 112 to output a tracking control signal (TRO). The tracking control signal is input into the carrier controller 122 of the digital controller 120 to generate a digital control signal (DCV) 131 .

Referring to FIG. 7, when the CD player is in a short-distance cross-track (Short Seek) control mode, the tracking signal is a velocity error (VE) signal, and the frequency converter 130 is a voltage-to-frequency converter. The velocity error (VE) signal is input to the short-distance over-track controller 114 of the tracking actuation controller 110 to generate a tracking control signal (TRO). The tracking control signal is input to the carrier controller 122 of the digital controller 120 to generate a digital control signal (DCV) 131 . Wherein, the short-distance cross-track controller 114 includes an error amplifier 121 and a track-following controller 118 .

Referring to FIG. 8, when the CD player is in a long-distance cross-track (Long Seek) control mode, the tracking signal is a center error signal (CE), and the frequency converter 130 is a speed-frequency converter. The center error signal (CE) will be input to the center error controller 116 of the tracking actuator controller 110 to generate the tracking control signal (TRO). The tracking control signal is used to control the objective lens 90 at a central position, and The speed profile generator 124 of the digital controller 120 receives a cross-track total signal (TRKNUM) and a cross-track direction signal (TRKDIR) to generate the digital control signal (DCV) 131 .

When executing the tracking control method, the tracking controller 112 will control the objective lens 90 of the optical disc drive to follow the track on the disc of the optical disc drive. 40 must follow the slow rotation, so that the carrier moves slowly, so as to keep the objective lens 90 from deviating too far, avoiding the defect of causing the objective lens to tilt (Tilt). When the short-distance cross-track control method is implemented, the fast and accurate cross-track control is completed by closed-loop control, which can be further divided into the use of speed error after gain amplification to perform carrier control, or the use of feedback cross-track signals , and then drive the carrier according to the number of tracks and the span. On the other hand, when performing long-distance cross-track control, open-loop control and central error control (Central Error Control) are used to ensure that the objective lens 90 is at the center, and then cooperate with a precise short-distance cross-track to reach Positioning across long distances.

The three control modes described in the present invention will now be described in detail respectively.

         1. Tracking Following:

Referring to FIG. 4 for the tracking control mode of the optical disc drive carrier of the present invention, FIG. 4 is a schematic diagram of block connections of the tracking control system in the embodiment of the present invention. It mainly includes a signal controller 100, a frequency converter 130 and a periodic sine/cosine wave generator 140, which are sequentially connected to transmit signals. In the tracking control mode of the present invention, under the focus control of the pickup head 60 of the optical disc drive, a tracking signal is generated and input to the signal controller 100 to generate a digital control signal (DCV) 131 . In the tracking control mode, the tracking signal is a tracking error (TE) signal. The frequency converter 130 is connected to the signal controller 100 for receiving the digital control signal 131 to generate a pulse flag signal (Pulse) 135 and a direction flag signal (Dir) 136 . The periodic sine/cosine wave generator 140 is connected to the frequency converter 130 for receiving the pulse flag signal 135 and the direction flag signal 136 to generate carrier control signals (SLED 1) 170, (SLED 2) 180 , is a driving pulse signal, which is used to drive the carrier motor 40 (a stepping motor) of the optical disc drive to move the carrier 65 of the optical disc drive to an appropriate position.

In the embodiment of the tracking control system of the present invention, the signal controller 100 includes a tracking controller 112 and a carrier controller 122 . The tracking controller 112 receives a tracking signal (a tracking error signal TE) to output a tracking control signal (TRO). The tracking control signal (TRO) is then connected to the carrier controller 122 , and is controlled to output a digital control signal (DCV) 131 . And the embodiment that the frequency converter 130 is a voltage-to-frequency converter receives the digital control signal (DCV) 131, and outputs the pulse flag signal 135 and the direction flag signal 136, and then transmits to the periodic sine/cosine wave generator In 140, the periodic sine/cosine wave generator 140 mainly includes a periodic sine/cosine wave table (Ring Table), which corresponds to different sine waves according to the different values of the pulse flag signal 135 and the direction flag signal 136. (SIN) and cosine (COS) pulse signals.

In addition, in the tracking control embodiment of the present invention, the sine and cosine pulse signals can be connected to the attenuator (Ks) 150 to attenuate the signals to enter the power saving mode. And also include a motor selector (DCM) 16, in order to switch and select DC motor (DC Motor) operation (DCM="1") or stepping motor operation (DCM="0") as carrier motor 40, to provide different Choice of carrier motor. The carrier control signal (SLED 1) 170, (SLED 2) 180 signal can be connected to the carrier motor 40 after first being connected to the power driver 20 for adjustment.

When performing tracking control, the input tracking error (TE) is in the tracking controller 112, and the inside of the tracking controller 112 may contain a gain (Gain), a phase delay controller (Phase Lag) and a phase advance controller ( Phase Lead) and other components. Afterwards, the tracking controller 112 will output the tracking control signal (TRO), which is mainly used for transmission to the external power driver 20, so as to drive the objective lens 90 of the pickup head 60 of the optical disc drive to perform the reading action. This is due to the carrier ( Sled) must also be controlled synchronously to keep the objective lens 90 at the center of the read head 60 . Afterwards, the tracking control signal (TRO) is input into the carrier controller 122 . When the set motor selector (DCM) 16 is set to DCM="1", it is a DC motor operation, and the digital control signal (DCV) 131 output by the carrier controller 122 can be directly sent to the carrier control signal (SLED 1) 170 to control the DC motor. In addition, when the motor selector (DCM) 16 is set to DCM="0", it is a stepping motor operation mode. At this time, the digital control signal (DCV) 131 will be input to the frequency converter 130, and its effect is to have The value of the digital control signal (DCV) 131 of positive and negative signs is converted into a frequency pulse (Pulse) flag signal 135 and a direction (Dir) flag signal 136 equivalent to the DCV value.

Regarding the frequency converter 130 during tracking control, it is a voltage-to-frequency converter (VCO 1), and its further description may refer to FIG. 5, which shows the frequency converter in the tracking control of the embodiment of the present invention. Schematic diagram of the internal functions of 130. Among them, VCO 1_acc 132 is an accumulator (Accumulator), which will accumulate the value of the digital control signal 131 each time, when the value of the accumulator VCO1_acc 132 is greater than the upper limit (SAT) 133, the accumulator VCO 1_acc 132 will automatically subtract The value of 2*SAT, and will send out the characteristic bit signal of Pulse=1, Dir=0, represent to send forward rotation pulse; The value of 2 ^* SAT will be added automatically, and the flag signal of Pulse=1, Dir=1 will be sent out, indicating that the reverse rotation pulse is sent out. Then the pulse (Pulse) flag signal 135 and the direction (Dir) flag signal 136 are transmitted to the periodic sine/cosine wave generator 140 to compare the corresponding sine (SIN) and cosine (COS) values.

In addition, the periodic sine/cosine wave table contained in the periodic sine/cosine wave generator 140 is a function of a comparison table. Referring to FIG. 6, FIG. 6 shows that in the tracking control of the embodiment of the present invention, Schematic diagram of the comparison table of the internal periodic sine/cosine wave table of the periodic sine/cosine wave generator 14. It is disclosed that the periodic sine/cosine wave table is a two-dimensional array of 2×S, and internally stores a sine function table (SIN Table) 141 and a cosine function table (COS Table) 142 from 0 to 2π. When the flag signal Pulse=1, Dir=0, an index index (Index) 144 will rotate P intervals forward, and this P value is a micro-step interval value 143, and when the index index (Index) is greater than When the value is S (Index>S), it will automatically loop back to Index=1 to achieve continuous output of sine wave (sin wave) and cosine wave (cos wave) signals. When Pulse=1, Dir=1, the index index (Index) 144 will reversely rotate P intervals 143, and when Index<1, it will automatically cycle back to the value of Index=S.

In addition, the periodic sine/cosine wave table will obtain the desired sine and cosine output values, and the signal output values of the sine and cosine will respectively pass through the attenuator 150, and then be the external carrier control signal (SLED 1) 170, ( SLED 2) 180. In addition, when the DCM of the motor selector 16 = "0", it is a stepping motor operation. As shown in FIG. 4, the carrier control signals (SLED1) 170, (SLED2) 180 will drive the carrier motor 40 (which may be a stepping motor) through the power amplifier 20. During tracking control, the attenuator 150 can be set small to enter the power saving mode to avoid heating of the stepping motor.

2. Short-distance cross-track control (Short Seek):

Regarding the short-distance cross-track control mode of the digital optical disk drive carrier of the present invention, refer to the description of FIG. 7 , which is a schematic diagram of block connections of the short-distance cross-track control in the embodiment of the present invention. It mainly includes: a signal controller 100, a frequency converter 130 and a periodic sine/cosine wave generator 140, which are sequentially connected to transmit signals. In the embodiment of the present invention, in the short-distance cross-track control mode, first, move the pickup head 60 of the optical disc drive to generate a tracking signal, and input it to the signal controller 100 to generate a digital control signal (DCV) 131 . Wherein, the tracking signal received by the signal controller 100 is a velocity error (VE) signal. The digital control signal (DCV) 131 is input into the frequency converter 130 to generate a pulse flag signal (Pulse) 135 and a direction flag signal (Dir) 136 . The periodic sine/cosine wave generator 140 is connected to the frequency converter 130 for receiving the pulse flag signal 135 and the direction flag signal 136 to generate carrier control signals (SLED 1) 170, (SLED 2) 180 , is a driving pulse signal, which is used to drive the carrier motor 40 (a stepper motor) of the optical disc player to control the carrier of the optical disc player.

In the aforementioned short-distance cross-track control mode of the present invention, the signal controller 100 includes a short-distance cross-track controller (Short Seek Controller) 114 and a carrier controller (Sled Controller) 122, and the short-distance cross-track controller 114 It also includes an error amplifier 121 and a tracking controller 118 . Wherein the error amplifier 121 receives the speed error (VE) signal, is connected to the tracking controller 118 after being amplified, and outputs a tracking control signal (TRO), except that the tracking control signal (TRO) is connected to the power driver 20 , and connected to the carrier controller 122 for outputting a digital control signal (DCV) 131 . The frequency converter 130 is a voltage to frequency converter (VCO 1).

There are two short-distance cross-track control methods. In addition to the above-mentioned methods, there is also a control method for feedback cross-track signals. As shown in FIG. 7 , in the short-distance cross-track control mode of the present invention, a signal gainer (Ktx) 126 and a control mode switcher (TXM) 128 are also connected. Wherein, the signal gainer 126 receives the cross-track signal (TX/RX), and is connected to the control mode switcher (TXM) 128 after gain amplification. The control mode switcher 128 can mainly control the selection signal so that the frequency converter 130 can select the digital control signal (DCV) 131 output by the receiving carrier controller 122 or the cross-track signal gain Ktx value after receiving gain. Then the frequency converter 130 can output the pulse flag signal (Pulse) 135 and the direction flag signal (Dir) 136 after the voltage-to-frequency conversion, and then input them into the periodic sine/cosine wave generator 140 .

Similarly, in the short-distance cross-track control, the periodic sine/cosine wave generator 140 mainly has the function of a comparison table, which includes a periodic sine/cosine wave table, which is connected to the frequency converter 130, and according to the pulse characteristics Different values of the bit signal (Pulse) 135 and the direction flag signal (Dir) 136 correspond to different sine (SIN) and cosine (COS) pulse signals. It can then be connected to a pair of attenuators (Ks) 150 . The pair of attenuators 150 is connected to the output end of the periodic sine/cosine wave generator 140, and its main function is to increase the attenuation value to increase the power during short-distance tracking control. And there is also a motor selector (DCM) 160 for switching between DC motor operation (DCM="1") and stepping motor operation (DCM="0"). Finally, the carrier control signals (SLED 1) 170 and (SLED 2) 180 are output, which are connected to the attenuator 150, and are the attenuated output signals of the attenuator 150, and are pulse signals for driving the carrier motor, which can be used to further drive the carrier motor action.

On the other hand, in the block diagram of the short-distance cross-track control system shown in FIG. 7 , the short-distance cross-track control method is closed-loop control. The two control methods for short-distance cross-track are described as follows:

            2-1. The first short-distance cross-track control:

Mainly, the cross-track velocity error (VE) is amplified by the error amplifier 121, and then input to the tracking controller 114 to output the tracking control signal (TRO), and the tracking control signal is then input to the carrier controller 122 A voltage signal for control can be obtained, which is a digital control signal (DCV) 131 . Wherein, the gain and the bandwidth of the vehicle controller 122 are different from those of the vehicle controller 122 in the previous tracking control method. In addition, set DCM="0" of the motor selector 160 to be the operation mode of the stepping motor. On the other hand, setting TXM="0" of the control mode switch (TXM) 23 is the control mode of the tracking control signal (TRO). Then, as in the previous tracking control mode, through the frequency converter 130, the periodic sine/cosine wave generator 140 and the attenuator 150, the carrier control signals (SLED 1) 170, (SLED 2) 180 are output to drive the stepper motor.

                                                                                   

The second method is to use the feedback cross-track signal (TX or RX), and then directly drive the stepping motor of the carrier motor 40 according to the number of cross-tracks and the track pitch (TrackPitch), because the number of driving pulses PN of the stepping motor is related to the number of cross-tracks There are the following relations:

PN＝TN ^* TP/Plength (1)

in:

PN: The number of driving pulses of the stepping motor

Plength: Drive the stepper motor for one pulse, the distance traveled by the carrier (Sled) (μm)

TN: number of tracks

TP: Track Pitch (Track Pitch), 1.6 μm When crossing the track, each positive edge of the crossing track signal (TX or RX) will trigger the gain of the crossing track signal gainer (Ktx) 126 once, when the control mode switcher When (TXM) 128's setting TXM="1", then the frequency converter 130 will receive the gain value of the signal gainer Ktx once at the positive edge of each cross-track signal (TX or RX), and the control mode immediately after Then, like the previous tracking control mode, the carrier control signals (SLED 1) 170 and (SLED 2) 180 are output through the periodic sine/cosine wave generator 140 and attenuator 150 to generate driving pulse signals to drive the stepper motor. In addition, the attenuator 150 can be set larger when crossing the track for a short distance, so as to increase the power for crossing the track for a short distance.

3. Long-distance cross-track control (Long Seek):

For the long-distance cross-track control mode of the optical disc drive carrier according to the present invention, refer to the description of FIG. 8 . The long-distance cross-track control system includes a signal controller 100 , a frequency converter 130 and a periodic sine/cosine wave generator 140 . The signal controller 100 receives a tracking signal (a center error (CE) signal in the long-distance cross-track mode) to generate a digital control signal (DCV) 131 . The frequency converter 130 is connected to the signal controller 100 for receiving the digital control signal 131 to generate a pulse flag signal (Pulse) 135 and a direction flag signal (Dir) 136 . The periodic sine/cosine wave generator 140 is connected to the frequency converter 130 for receiving the pulse flag signal 135 and the direction flag signal 136 to generate carrier control signals (SLED 1) 170, (SLED 2) 180, The carrier motor 40 used to drive the optical disc drive is a stepping motor to control the carrier 65 of the optical disc drive.

Regarding the method for long-distance cross-track control of the present invention, the steps include: (a) under the focus control of the pickup head 60 of the optical disc drive, a tracking signal is generated, which is a center error (CE) signal; (b) Input the center error (CE) signal into the signal controller 100 of the CD player to generate a digital control signal 131; (c) input the digital control signal 131 into the frequency converter 130 of the CD player to generate a pulse flag signal (Pulse ) 135 and a direction flag signal (Dir) 136; (d) input the pulse flag signal 135 and the direction flag signal 136 into the periodic sine/cosine wave generator 140 of the CD player to generate the carrier control signal (SLED 1 ) 170, (SLED 2) 1 80, used to drive the stepping motor of the CD player to control the carrier 65 of the CD player.

The above-mentioned long-distance cross-track control system of the optical disc player carrier is further described as follows with reference to FIG. 8 : the signal controller 100 includes a central error controller 116 and a speed curve generator 124 . Wherein, the center error controller 116 receives the center error (CE) number, and outputs a tracking control signal (TRO) after being controlled. The speed curve generator 124 receives signals of the number of tracks crossed (TRKNUM) and the direction of the track crossed (TRKDIR), and outputs a digital control signal (DCV) 131 . The digital control signal 131 is then connected to the frequency converter 130 . During long-distance cross-rail control, the frequency converter 130 is a speed-to-frequency converter (VCO 2), and the effect of the speed-to-frequency converter (VCO 2) is the same as that of the voltage-to-frequency converter (VCO 1), but its upper limit is a value of f1, the lower limit is 0; and the accumulator of the speed frequency converter (VCO 2) can only accumulate upwards, when the accumulator value>f1, the accumulator value will automatically subtract f1. Afterwards, the frequency converter 130 receives the digital control signal 131 and outputs signals such as a pulse flag signal (Pulse) 135 and a direction flag signal (Dir) 136 after conversion.

Also include periodic sine/cosine wave generator 140 among Fig. 8, mainly comprise periodic sine/cosine wave table, be the function of a comparison table, be connected in frequency converter 130, according to this pulse flag signal (Pulse) Different values of 135 and direction flag signal (Dir) 136 correspond to different sine and cosine pulse signals. Then it can be further connected to the attenuator 150, and the attenuation value can be set larger to increase the power required for long-distance cross-track control. In addition, it also includes a motor selector (DCM) 160, which is used to switch and select DC motor operation (DCM="1") or stepping motor operation (DCM="0"); and output a carrier control signal (SLED 1) 170, (SLED 2) 180, for driving the pulse signal of the carrier motor 40, in order to drive the stepper motor.

As shown in FIG. 8 , the control of long-distance cross-track is an open-loop control mode. At this time, the signal controller 100 switches to the center error control mode, and the center error (CE) value is input to the center error controller (CEController) 116, The tracking control signal (TRO) output by the center error controller 116 is used to control the objective lens 90 of the pick-up head 60 of the optical disc drive to maintain the center position. And the central error controller 116 also includes a combination of components such as a gain, a low-pass filter, a phase lead filter, and a phase delay filter. In addition, the long-distance cross-track control function block shown in FIG. 8 is mainly composed of a speed curve generator 124 and a frequency converter 130 (a speed-frequency converter VCO 2). Referring to FIG. 9 for the control flow of the speed profile generator 124, and as shown in FIG. 9, the speed profile generator 124 can set acceleration (ACC), maximum speed (HSP), deceleration (DEC), low (LSP), the total track number (TRKNUM) and the track track direction (TRKDIR); meanwhile, the state is first set to accelerate state=ACC to prepare to start the long-distance track track. And step 315 is an interrupt service routine, a frequency value of its operating frequency=f1Hz; Then execute the judgment 316 of state (state), state (state) can be acceleration (ACC), high speed (HSP), deceleration (DEC) or It is a state such as the end of cross-track (STOP).

3-1. If state=ACC (acceleration), it is an acceleration section, then execute program 312, the content of program 312 includes (1) acceleration, (2) whether to reach high speed and need to switch to state=HSP (high speed), ( 3) The speed frequency converter (VCO 2) decides whether to send out the Pulse flag signal, (4) whether to decelerate and need to switch to state=DEC (deceleration).

3-2. If state=HSP (high speed), then execute program 313, the content of program 313 comprises (1) speed-frequency converter (VCO 2) decides whether to send pulse (Pulse) flag signal, (2) whether to be deceleration Instead, switch to state=DEC (deceleration).

3-3. if state=DEC (deceleration), then carry out program 314, the content of program 314 comprises (1) deceleration, (2) whether arrive low speed, (3) speed-frequency converter (VCO 2) decides whether to send pulse ( Pulse) flag signal, (4) Whether the number of residual tracks is zero and needs to be switched to state=STOP.

The follow-up control action is the same as the aforementioned tracking control, through the periodic sine/cosine wave generator 140 and attenuator 150 to output carrier control signals (SLED 1) 170, (SLED 2) 180 to further drive the carrier Motor 40 is a stepper motor. Wherein, the attenuator 150 can be set larger when crossing the track for a long distance, so as to increase the power.

The present invention has been successfully applied in CD-RW disc drives, and the velocity waveform produced by the velocity curve generator is linear rather than stepped. Pulse repetition frequency (Pulse Rate), the unit is voltage. Apparently, the present invention has effectively improved the step-wise defect in the common technology. Using the stepping motor to control the carrier of the optical disc drive can make the speed curve characteristics of the optical disc drive carrier control meet the linear slope characteristics during acceleration and deceleration, and avoid the defects of vibration and noise caused by the traditional step speed curve method. In addition, because the cost of the stepper motor drive mechanism is lower than that of DC motor drive, optical detection feedback and magnetic detection feedback, and it is suitable for high-speed cross-track, the stepper motor drive carrier has become the mainstream trend.

In addition, the present invention directly uses the control IC, which effectively replaces the inconvenience of writing programs for the CPU used by the public technology, and simplifies the design of the control circuit, which can greatly reduce the production cost of the CD player system.

To sum up, the method for controlling the carrier of a digital optical disc player according to the present invention can provide users with a control method that avoids noise and vibration, reduces costs and simplifies the circuit while complying with the control characteristics of the carrier of the digital disc player.

The above descriptions are only preferred embodiments of the present invention, and should not be used to limit the implementation scope of the present invention. All equivalent changes and modifications made according to the scope of the claims of the present invention shall fall within the scope covered by the claims of the present invention.

Claims (58)

1. A method for controlling a carrier of an optical disc drive, comprising: (a) moving the pickup head of the optical disc drive to generate a tracking signal, wherein the pickup head includes the carrier and an objective lens; (b) inputting the tracking signal into the tracking actuator controller of the optical disc drive to generate a tracking control signal (TRO) for controlling the position of the objective lens of the pickup head; (c) inputting the tracking control signal into the digital controller of the optical disc player to generate a digital control signal (DCV); (d) inputting the digital control signal into the frequency converter of the CD player to generate a pulse flag signal (Pulse) and a direction flag signal (Dir); (e) Inputting the pulse flag signal and the direction flag signal into the periodic sine/cosine wave generator of the optical disc drive to generate a carrier control signal, which is used to drive the stepping motor of the optical disc drive , to control the carrier for that jukebox. 2. The method as claimed in claim 1, wherein the CD player further comprises a motor selector and a DC motor, when the motor selector is set to a DC motor mode, the digital control signal generated by step (c) It will be directly used to drive the DC motor of the CD player to control the carrier of the CD player. When the motor selector is set to the stepping motor mode, the digital control signal will be input to the frequency converter to continue Perform steps (d) and (e). 3. The method of claim 1, wherein the periodic sine/cosine wave generator comprises a periodic sine/cosine wave table, and the periodic sine/cosine wave generator can A sine (SIN) value and a cosine (COS) value corresponding to the pulse flag signal and the direction flag signal are detected to serve as the carrier control signal respectively. 4. The method of claim 1, wherein the tracking actuator controller of the optical disc drive comprises a tracking controller, and the digital controller comprises a carrier controller, when the optical disc drive is in a tracking control mode , the tracking signal will be input to the tracking controller of the tracking actuation controller to generate the tracking control signal, and the tracking control signal will be input to the carrier controller of the digital controller to generate The digital control signal. 5. The method of claim 4, wherein the frequency converter is a voltage to frequency converter. 6. The method as claimed in claim 4, wherein the tracking signal is a tracking error signal (TE). 7. The method of claim 1, wherein the tracking actuation controller of the optical disc drive comprises a short-distance cross-track controller, and the digital controller comprises a carrier controller, when the optical disc drive is in a short-distance In the cross-track control mode, the track signal will be input to the short-distance cross-track controller of the track actuation controller to generate the track control signal, and the track control signal will be input to the digital controller a carrier controller to generate the digital control signal. 8. The method of claim 7, wherein the frequency converter is a voltage to frequency converter. 9. The method as claimed in claim 7, wherein the tracking signal is a velocity error signal (VE). 10. The method as claimed in claim 7, wherein the short-distance cross-track controller comprises an error amplifier and a tracking controller, the error amplifier is used to receive the tracking signal to amplify the tracking signal, and the The tracking controller is used to receive the amplified tracking signal to output the tracking control signal. 11. The method of claim 1, wherein the tracking actuation controller of the optical disc drive comprises a center error controller, and the digital controller comprises a velocity profile generator, when the optical disc drive is in a long-distance span In the track control mode, the track signal will be input to the center error controller of the track actuation controller to generate the track control signal, and the track control signal is used to control the objective lens to a central position, The speed curve generator of the digital controller receives a cross-track total signal (TRKNUM) and a cross-track direction signal (TRKDIR) to generate the digital control signal. 12. The method of claim 11, wherein the frequency converter is a speed-to-frequency converter. 13. The method of claim 11, wherein the tracking signal is a center error signal (CE). 14. A method for controlling a carrier of an optical disc player, comprising: (a) moving the pickup head of the optical disc drive to generate a tracking signal; (b) inputting the tracking signal into a signal controller of the optical disc player to generate a digital control signal; (c) inputting the digital control signal into the frequency converter of the CD player to generate a pulse flag signal (Pulse) and a direction flag signal (Dir); (d) inputting the pulse flag signal and the direction flag signal into the periodic sine/cosine wave generator of the CD player to generate a carrier control signal, which is used to drive the stepping motor of the CD player , to control the carrier for that jukebox. 15. The method as claimed in claim 14, wherein the CD player further comprises a motor selector and a DC motor, when the motor selector is set to a DC motor mode, the digital control signal generated in step (b) It will be directly used to drive the DC motor of the optical disc drive to control the carrier of the optical disc drive. 16. The method as claimed in claim 14, wherein the periodic sine/cosine wave generator comprises a periodic sine/cosine wave table, and the periodic sine/cosine wave generator will be based on the periodic sine/cosine wave table A sine (SIN) value and a cosine (COS) value corresponding to the pulse flag signal and the direction flag signal are detected as the carrier control signal. 17. The method as claimed in claim 14, wherein the signal controller of the optical disc player comprises a tracking controller and a carrier controller, when the optical disc player is in a tracking control mode, the tracking signal will be input to The tracking controller is used to generate a tracking control signal, and the tracking control signal is input to the carrier controller to generate the digital control signal. 18. The method of claim 17, wherein the frequency converter is a voltage to frequency converter. 19. The method of claim 17, wherein the tracking signal is a tracking error signal (TE). 20. The method as claimed in claim 14, wherein the signal controller of the optical disc drive comprises a short-distance cross-track controller and a carrier controller, and when the optical disc drive is in a short-distance cross-track control mode, the tracking The signal is input to the short-distance cross-track controller to generate a tracking control signal, and the tracking control signal is input to the carrier controller to generate the digital control signal. 21. The method of claim 20, wherein the frequency converter is a voltage to frequency converter. 22. The method of claim 20, wherein the tracking signal is a velocity error signal (VE). 23. The method as claimed in claim 20, wherein the short-distance cross-track controller comprises an error amplifier and a tracking controller, the error amplifier is used to receive the tracking signal to amplify the tracking signal, and the The tracking controller is used to receive the amplified tracking signal to output the tracking control signal. 24. The method as claimed in claim 14, wherein the signal controller of the optical disc player comprises a signal booster and a control mode switcher, when the optical disc player is in a short-distance cross-track control mode, by using the control mode The switcher is set to a predetermined mode, the positive edge of the tracking signal will trigger the signal gainer to gain, to generate the tracking control signal, and the tracking control signal will be input to the carrier controller to generate the digital control signal. 25. The method of claim 24, wherein the frequency converter is a voltage to frequency converter. 26. The method of claim 24, wherein the tracking signal is a cross-track signal (TX or RX). 27. The method as claimed in claim 14, wherein the signal controller of the optical disc player comprises a center error controller and a speed profile controller, and when the optical disc player is in a long-distance cross-track control mode, the tracking signal It will be input to the center error controller to generate a tracking control signal to control the position of the objective lens, and the speed curve generator will receive a cross-track total signal (TRKNUM) and a cross-track direction signal (TRKDIR) to The digital control signal is generated. 28. The method of claim 27, wherein the frequency converter is a speed frequency converter. 29. The method of claim 27, wherein the tracking signal is a center error signal (CE). 30. A control system applied to an optical disc drive, which uses a stepping motor to control the carrier of the optical disc drive, the optical disc drive includes a pickup head, the pickup head includes an objective lens and the carrier, the control system include: A tracking actuator controller is used to receive a tracking signal and generate a tracking control signal (TRO) according to the tracking signal to control the position of the objective lens; A digital controller, connected to the tracking actuator controller, is used to receive the tracking control signal to generate a digital control signal; A frequency converter, connected to the digital controller, is used to receive the digital control signal to generate a pulse flag signal and a direction flag signal; A periodic sine/cosine wave generator, connected to the frequency converter, is used to receive the pulse flag signal and the direction flag signal to generate a carrier control signal, and the carrier control signal is used to drive the optical disc drive A stepper motor to control the carrier of the optical drive. 31. The control system as claimed in claim 30, wherein the optical disc player further comprises a motor selector and a DC motor, when the motor selector is set to a DC motor mode, the digital control generated by the digital controller The signal will be directly used to drive the DC motor of the CD player to control the carrier of the CD player, and when the motor selector is set to the stepping motor mode, the digital control signal will be input to the frequency converter. 32. The control system as claimed in claim 30, wherein the periodic sine/cosine wave generator comprises a periodic sine/cosine wave table, the periodic sine/cosine wave generator will be based on the periodic sine/cosine wave The table is used to find out a sine (SIN) value and a cosine (COS) value corresponding to the pulse flag signal and the direction flag signal as the first carrier signal and the second carrier signal respectively. 33. The control system as claimed in claim 30, wherein the tracking actuation controller of the optical disc player comprises a tracking controller, and the digital controller comprises a carrier controller, when the optical disc player is in a tracking control mode, the tracking signal will be input to the tracking controller of the tracking actuation controller to generate the tracking control signal, and the tracking control signal will be input to the carrier controller of the digital controller to The digital control signal is generated. 34. The control system of claim 33, wherein the frequency converter is a voltage to frequency converter. 35. The control system as claimed in claim 33, wherein the tracking signal is a tracking error signal (TE). 36. The control system as claimed in claim 30, wherein the tracking actuation controller of the optical disk drive comprises a short-distance cross-track controller, and the digital controller comprises a carrier controller, when the optical disk drive is in a short distance In the distance crossing track control mode, the tracking signal will be input to the short distance crossing track controller of the tracking actuation controller to generate the tracking control signal, and the tracking control signal will be input to the digital controller carrier controller to generate the digital control signal. 37. The control system of claim 36, wherein the frequency converter is a voltage to frequency converter. 38. The control system as claimed in claim 36, wherein the tracking signal is a velocity error signal (VE). 39. The control system as claimed in claim 36, wherein the short-distance cross-track controller comprises an error amplifier and a tracking controller, and the tracking signal is input to the short-distance cross-track control of the tracking actuator controller device to generate the tracking control signal. 40. The control system as claimed in claim 30, wherein the tracking actuation controller of the optical disk drive comprises a center error controller, and the digital controller comprises a speed profile generator, when the optical disk drive is in a long distance In cross-track control mode, the tracking signal will be input to the center error controller of the tracking actuation controller to generate the tracking control signal, and the tracking control signal is used to control the objective lens to a central position , and the speed curve generator of the digital controller receives a cross-track total signal (TRKNUM) and a cross-track direction signal (TRKDIR) to generate the digital control signal. 41. The control system of claim 40, wherein the frequency converter is a speed frequency converter. 42. The control system of claim 40, wherein the tracking signal is a center error signal (CE). 43. A control system applied to an optical disc drive, which uses a stepping motor to control the carrier of the optical disc drive, the optical disc drive includes a pickup head, the pickup head includes an objective lens and the carrier, the control system include: A signal controller is used to receive a tracking signal to generate a digital control signal; A frequency converter, connected to the signal controller, is used to receive the digital control signal to generate a pulse flag signal and a direction flag signal; A periodic sine/cosine wave generator, connected to the frequency converter, is used to receive the pulse flag signal and the direction flag signal to generate a carrier control signal, and the carrier control signal is used to drive the optical disc drive A stepper motor to control the carrier of the optical drive. 44. The control system as claimed in claim 43, wherein the CD player further comprises a motor selector and a DC motor, when the motor selector is set to a DC motor mode, the digital control generated by the signal controller The signal is directly used to drive the DC motor of the CD player to control the carrier of the CD player, and when the motor selector is set to the stepping motor mode, the digital control signal is input to the frequency converter. 45. The control system as claimed in claim 43, wherein the periodic sine/cosine wave generator comprises a periodic sine/cosine wave table, the periodic sine/cosine wave generator will be based on the periodic sine/cosine wave The table is used to find out a sine (SIN) value and a cosine (COS) value corresponding to the pulse flag signal and the direction flag signal as the carrier control signal. 46. The control system as claimed in claim 43, wherein the signal controller comprises a tracking controller and a carrier controller, when the optical disc player is in a tracking control mode, the tracking signal will be input to the tracking The track controller is used to generate a track control signal, and the track control signal is input to the carrier controller to generate the digital control signal. 47. The control system of claim 46, wherein the frequency converter is a voltage to frequency converter. 48. The control system as claimed in claim 46, wherein the tracking signal is a tracking error signal (TE). 49. The control system as claimed in claim 43, wherein the signal controller comprises a short-distance cross-track controller and a carrier controller, and when the optical disc player is in a short-distance cross-track control mode, the tracking signal will be It is input to the short-distance cross-track controller to generate a tracking control signal, and the tracking control signal is input to the carrier controller to generate the digital control signal. 50. The control system of claim 49, wherein the frequency converter is a voltage to frequency converter. 51. The control system of claim 49, wherein the tracking signal is a velocity error signal (VE). 52. The control system as claimed in claim 49, wherein the short-distance cross-track controller comprises an error amplifier and a tracking controller, the error amplifier is used to receive the tracking signal to amplify the tracking signal, and The tracking controller is used to receive the amplified tracking signal to output the tracking control signal. 53. The control system as claimed in claim 43, wherein the signal controller of the optical disc player comprises a cross-track signal gainer and a control mode switcher, when the optical disc player is in a short-distance cross-track control mode, by The control mode switch is set to a predetermined mode, the positive edge of the tracking signal will trigger the signal gainer to perform gain amplification to generate the tracking control signal, and the tracking control signal will be input to the carrier controller, to generate the digital control signal. 54. The control system of claim 53, wherein the frequency converter is a voltage to frequency converter. 55. The control system as claimed in claim 53, wherein the tracking signal is a cross-track signal (TX or RX). 56. The control system as claimed in claim 43, wherein the signal controller of the optical disc player comprises a center error controller and a velocity profile controller, and when the optical disc player is in a long-distance cross-track control mode, the tracking The signal will be input to the central error controller to generate a tracking control signal to control the position of the objective lens, and the speed curve generator will receive a cross-track total signal (TRKNUM) and a cross-track direction signal (TRKDIR) to generate the digital control signal. 57. The control system of claim 56, wherein the frequency converter is a speed frequency converter. 58. The control system of claim 56, wherein the tracking signal is a center error signal (CE).

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