JPH1173650A - Track traverse speed detecting device for disk player - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce an effect due to a phase delay caused by sampling by detecting a spot speed with a total light receiving amount signal period being a 1/2 period of a tracking error signal and generating a speed error signal. SOLUTION: An acceleration pulse generator 29 is triggered by a JT signal outputted from a controller 21 to output an acceleration pulse of a prescribed level for a prescribed time. An addition/subtraction circuit 28 output is addition- inputted to the addition/subtraction circuit 30, and a reference speed signal outputted from a changeover switch 32 is addition-inputted to it. The addition/ subtraction circuit 30 outputs the speed error signal according to a difference between a radial directional moving speed of an information detection point and the reference speed. Further, a pulse having rise/fail edges synchronized with a zero cross of a total light receiving amount signal high-band component by a comparator 4 is generated by an edge detector 20-b to be added to a speed detection circuit 31, and this signal becomes a trigger input to a single- stable multivibrator 33, and its Q output becomes a speed detection signal of a voltage level according to an information detection point radial directional moving speed through an LPF 34.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a speed servo for controlling the movement of a pickup spot.

[0002]

2. Description of the Related Art A speed servo for controlling a moving speed of a spot with respect to a disk to a desired value has been known.
It is used in various spot movement controls such as tracking servo pull-in and track jump control.

More specifically, a speed signal proportional to the relative speed of a spot with respect to a recording track is obtained based on the period of a tracking error signal, and a tracking actuator and / or a slider is generated by a drive signal generated based on the speed signal. The movement speed of the spot is controlled by driving the motor.

That is, before shifting from the state of performing a search or the like to the pull-in of the tracking servo, the frequency of the tracking error signal for performing the speed servo is reduced in order to reduce the moving speed of the spot in the disk radial direction. After that, the tracking servo loop is closed.

[0005] In this case, the speed servo is performed by generating a drive signal based on a speed error signal (generated from the tracking error signal) and driving the tracking actuator with the drive signal.

[0006] Thus, the tracking servo is pulled in after the frequency of the tracking error signal is lowered to within the response frequency band of the tracking servo system, so that the time required for the pull-in can be shortened.

[0007] The multi-track jump is a track jump that jumps over a plurality of tracks. When a track jump command is issued, the tracking servo and slider servo loops are first opened, and then a speed error signal corresponding to the difference between the speed signal (generated from the tracking error signal) and the reference signal is generated. The tracking actuator is forcibly driven by the speed error signal, and the slider is forcibly driven by a signal obtained by integrating the speed error signal.

By moving the spot at a desired speed and performing the track jump, the tracking servo and the slider servo can be quickly pulled in after the track jump is completed. This facilitates continuous jumps.

FIG. 4 is a circuit block diagram of a conventional track crossing speed detecting device. In FIG. 4, 6,7 out of the light receiving elements 5,6,7 for receiving the reflected light of the reading light beam.
Is a conventional light receiving element for tracking error generation,
Reference numeral 5 denotes a light receiving element for obtaining a total light receiving amount signal. The total received light amount signal refers to an electric signal output based on the total light amount of the light beam incident on the light receiving element 5 which is usually formed of a four-divided or two-divided element, and is used for generating an RF signal and a focus error signal. Can be The signals from the light receiving elements 6 and 7 receive the same amount of light when the read beam is on the information track and have the same output level. Produces a difference in each output.

The outputs of the light receiving elements 6 and 7 are supplied to a differential amplifier 8a. From the differential amplifier 8a to the light receiving element 6
And a signal corresponding to the level difference between the outputs of the second and seventh outputs.
The output of the differential amplifier 8a is supplied to the equalizer amplifier 9 as a tracking error signal a.

The tracking error signal a whose phase has been compensated by the equalizer amplifier 9 is supplied to a tracking actuator 14 via a changeover switch 12 and a drive circuit 13. Tracking actuator 14
A movable section on which an objective lens (not shown) is mounted, a support section for supporting the movable section by a spring or the like, and a movable section for recording the movable section in response to a drive signal output from the drive circuit 13. And means for displacing in the radial direction. A drive signal corresponding to the tracking error signal is supplied from the drive circuit 13 to the tracking actuator 14, and control is performed so that the spot light for information detection accurately tracks the recording track.

The above portion forms a tracking servo loop as fine adjustment means for controlling the relative position of the information detection point in the radial direction with respect to the recording track with high accuracy. Since the movable range of the movable portion of the tracking actuator 14 in this tracking servo loop is extremely small as compared with the radius of the recording disk,
The tracking servo loop alone cannot control the relative positions of the information detection points over a wide range over the entire radius of the recording disk.

For this reason, the tracking actuator 1
4 is moved in the radial direction with respect to the recording track, and the relative position of the information detection point is controlled with low accuracy so that the information detection point is located substantially at the center of the control range of the tracking servo loop. A slider servo loop is formed as coarse adjustment means.

That is, the output of the equalizer amplifier 9 is
The signal is supplied to a drive circuit 17 via an equalizer amplifier 15 and a changeover switch 16. The output of the drive circuit 17 is supplied to a slider motor 18 that radially drives a slider (not shown) on which the tracking actuator 14 is mounted.

On the other hand, the output of the differential amplifier 8a is supplied to a comparator 11 via a low-frequency elimination filter 10 having a differentiating circuit composed of a capacitor C and a resistor R, and is compared with a ground level. The comparator 11 generates a pulse having a rising edge and a falling edge synchronized with the zero cross of the high frequency component of the tracking error signal.

The output of the comparator 11 is supplied to one input terminal of an edge detector 20 constituted by an exclusive OR circuit or the like. An F / R signal output from the controller 21 is supplied to the other input terminal of the edge detector 20. The F / R signal is a high-level signal that is output, for example, when the direction of the jump operation is in the reverse direction (inner circumferential direction). When the F / R signal indicates the forward direction, the edge detector 20 outputs the comparator 11 Is output as it is, and when the F / R signal indicates the reverse direction, the edge detector 20 outputs a signal obtained by inverting the output of the comparator 11.

The pulse output from the edge detector 20 is supplied to a clock input terminal of a counter 22 and a trigger input terminal of a brake pulse generator 24. The counter 22 is supplied with jump number data indicating the number of tracks to jump from the controller 21. Counter 22
Is configured to preset jump data as a count value in response to a LOAD signal sent from the controller 21.

The counter 22 is supplied with a low-level EN signal from the output terminal of the D-type flip-flop 23. A JT signal (jump trigger signal) output from the controller 21 is supplied to a clock input terminal of the D-type flip-flop 23, and a LO input is applied to a clear input terminal.
An AD signal is supplied.

The D-type flip-flop 23 has a D
A power supply voltage is applied to the input terminal. Counter 22
Is configured to count down every time a clock is input only when the EN signal is output.
The output data of the counter 22 is supplied to the decoder 25. The decoder 25 outputs a high-level BRK signal when the output data value of the counter 22 reaches a predetermined value N, and outputs a high-level CLR signal when the output data value of the counter 22 becomes 0. It is configured to be.

The BRK signal and the CLR signal are used as trigger inputs for D-type flip-flops 26 and 27, respectively. These D-type flip-flops 26 and 27
A power supply voltage is applied to the D input terminal of the power supply. These D
The flip-flops 26 and 27 receive the BRK signal and C
When the LR signal is generated, the BRK signal and the CLR signal are set by the rising edge of the signal, and the BRK signal and the CLR signal are latched (stored and held). In addition, these D
The LOAD signal is supplied to the clear input terminals of the flip-flops 26 and 27.

The Q output of the D-type flip-flop 27 is supplied to an enable input terminal of the brake pulse generator 24. The brake pulse generator 24 is configured to output a brake pulse having a predetermined level for a predetermined time triggered by a signal output from the edge detector 20. The output of the brake pulse generator 24 is a subtraction input of the addition / subtraction circuit 28. The output of the acceleration pulse generator 29 is supplied to the addition / subtraction circuit 28 as an addition input.

The acceleration pulse generator 29 includes the controller 2
It is configured to output an acceleration pulse having a predetermined level over a predetermined time, triggered by a JT signal emitted from No. 1. The output of the addition / subtraction circuit 28 is supplied to the addition / subtraction circuit 30 as an addition input. The speed detection signal output from the speed detection circuit 31 is supplied to the addition / subtraction circuit 30 as a subtraction input, and the reference speed signal output from the changeover switch 32 is supplied as an addition input. The addition / subtraction circuit 30 outputs a speed error signal corresponding to the difference between the moving speed of the information detection point in the radial direction and the reference speed.

The speed detector 31 includes an edge detector 20
Are supplied. In the speed detection circuit 31, this signal is a trigger input of a monostable multivibrator (hereinafter, referred to as monostable multi) 33. The Q output of the monostable multi 33 is output as a speed detection signal having a voltage level corresponding to the moving speed of the information detection point in the radial direction via a low-pass filter (hereinafter, referred to as LPF) 34.

The output voltages E1 and E1 of the constant voltage sources 35 and 36 are respectively applied to the two input terminals of the changeover switch 32.
2 is applied. The voltage E1 is set to be equal to the voltage level of the speed detection signal obtained when the frequency of the TZ signal output from the edge detector 20 is 10 kHz, for example.

The voltage E2 has a frequency of 4 k of the TZ signal.
The frequency is set to be equal to the voltage level of the speed detection signal obtained at Hz. The Q input of the D-type flip-flop 26 is supplied to the control input terminal of the changeover switch 32. When the D-type flip-flop 26 is in the reset state, that is, when the BRK signal is not latched, the voltage of the changeover switch 32 is changed. E1 is selectively output as the reference speed signal, and when the D-type flip-flop 26 is in the set state, that is, when the BRK signal is latched, the voltage E2 is selectively output as the reference speed signal. .

The speed error signal output from the addition / subtraction circuit 30 is supplied directly to one input terminal of the changeover switch 37 and at the same time, is changed via the inversion amplifier 38 to the changeover switch 3.
7 is supplied to the other input terminal. Changeover switch 3
The F / R signal output from the controller 21 is supplied to a control input terminal 7. The changeover switch 37 selectively outputs the output of the addition / subtraction circuit 30 when the F / R signal is at a low level, and selectively outputs the output of the inverting amplifier 38 when the F / R signal is at a high level. It is configured.

The output of the changeover switch 37 is supplied to the drive circuit 13 via the changeover switch 12 and simultaneously to the drive circuit 17 via the LPF 39 and the changeover switch 16. These changeover switches 12 and 16
, A high level TRKSW signal (tracking servo switching signal) from the controller 21 and S
An LDSW signal (slider servo switching signal) is supplied.

The changeover switch 12 selectively outputs the tracking error signal passed through the equalizer amplifier 9 when the TRKSW signal is not supplied, and the speed error outputted from the changeover switch 37 when the TRKSW signal is supplied. It is configured to selectively output a signal. The switch 16 selectively outputs the tracking error signal passed through the equalizer amplifiers 9 and 15 when the SLDSW signal is not supplied, and selects the speed error signal passed through the LPF 39 when the SLDSW signal is supplied. It is constituted so that it may output it.

The controller 21 is composed of, for example, a microcomputer, and calculates the number of tracks to be jumped by one jump operation in response to a search command, a double speed command, or the like generated by a key operation of an operation unit (not shown). After transmitting the track number data and the LOAD signal, the JT signal, TRKSW signal and SL
It is configured to send out a DSW signal.

In the above jump operation control device, the tracking actuator is forcibly driven during the jump operation, and at the same time, the slider motor is forcibly driven by a signal obtained by integrating a speed error signal for driving the tracking actuator. Since the tracking actuator is driven, the slider on which the tracking actuator is mounted moves at the same time as the tracking actuator is displaced.

As a result, the rate of change of the amount of deviation of the tracking actuator required to make the moving speed of the information detection point equal to the reference speed becomes small. Accordingly, the amount of deviation of the tracking actuator at the end of the jump operation becomes small, and the amount of movement of the slider that moves so that the amount of deviation of the tracking actuator becomes zero by the operation of the slider servo device after the end of the jump operation becomes small. The settling time of the slider servo device is reduced.

[0032]

In the prior art, the speed signal is detected by a speed detection circuit 31. In other words, the tracking error signal is converted into a pulse signal having a rising edge and a falling edge synchronized with the zero cross by the low-pass filter 10 and the comparator 11, and this pulse signal is converted into the monostable multi 33 and the LPF.
The signal output through 34 is a speed detection signal having a voltage level corresponding to the moving speed of the spot in the radial direction. Thereafter, a speed error signal is generated using the speed detection signal.

According to this, the speed between the adjacent zero crosses is determined by the duty ratio between the pulse width output from the monostable multi 33 and the interval until the output of the next pulse. That is, since the instantaneous speed at an arbitrary point between zero crossings is detected when the next zero cross point is input, the speed at the above point is detected with a slight time delay (phase delay due to sampling). ). In addition, when the moving speed of the spot is slow, that is, when the interval between the zero crosses is long, the delay in the speed detection becomes large. As a result, there is a problem that the response of the speed servo is deteriorated and the movement control of the spot becomes unstable.

The present invention has been made in view of the above circumstances, and provides a track traversing speed detecting device for a disk player which can improve the response of a speed servo and stably control the movement of a reading spot. The purpose is to:

[0035]

According to a first aspect of the present invention, there is provided a fine adjustment means for adjusting a relative position of a spot of a pickup so as to follow a reading track of a disk, and a spot within a control range of the fine adjustment means. Coarse adjustment means for moving and adjusting the pickup in the radial direction of the disk so as to exist in the disk, speed detection means for generating a speed detection signal corresponding to the moving speed of the spot with respect to the disk, and a reference speed representing the speed detection signal and a predetermined reference speed A speed error signal generating means for generating a speed error signal according to a difference between the signal and a land / groove recording in which the fine adjustment means and / or the coarse adjustment means can be forcibly driven by the speed error signal. The speed detection signal in the track traversing speed control device of the disc player that reads the disc Characterized in that it is produced on the basis of the cycle of the total amount of received light signal detected by the flop.

The invention described in claim 2 is the first invention.
A tracking error detecting means for obtaining a tracking error signal corresponding to a deviation amount of a spot with respect to a track in a radial direction of the disk, and a fine adjusting means and a coarse adjusting means during normal reproduction. Are driven by a drive signal generated based on a tracking error signal.

Further, the invention described in claim 3 is the first invention.
Alternatively, in the track traversing speed detecting device for a disc player described in 2, the period of the total received light amount signal is detected by zero-cross detection of a high frequency component of the total received light amount signal.

The invention described in claim 4 is the first invention.
In the track crossing speed detecting apparatus for a disk player according to any one of the above-mentioned items 3, the land and groove disks are formed such that the land width and the groove width are substantially the same.

The invention described in claim 5 is the first invention.
5. The track crossing speed detecting device for a disc player according to any one of the items 1 to 4, further comprising an integrating means for integrating the speed error signal, wherein the fine adjustment means is forcibly driven by the speed error signal in response to the command, and the integrating means is integrated. The track jump operation is performed by forcibly driving the coarse adjustment means by the output of (1).

The invention according to claim 6 is the first invention.
5. The track-crossing velocity detecting device for a disk player according to any one of the above-described items, wherein in the land / groove disk, the period of the detected total received light amount signal is ２ of the period of the tracking error signal.

[0041]

According to the present invention, the tracking error signal 1
Since the speed of the spot is detected based on the cycle of the total received light amount signal, which is a half cycle, and the speed error signal is generated, the phase lag due to sampling is shorter than the case where the speed of the spot is detected based on the cycle of the tracking error signal. Can be reduced.

[0042]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Conventionally, as an optical disk recording / reproducing method, there are a groove recording method of recording data in a groove of a guide groove of an optical disk and a land recording method of recording data in a land. In recent years, with a further increase in capacity, a land / groove recording method for recording data on lands and grooves of a disk which has twice the capacity has been proposed.

In the land / groove recording method, in addition to the conventional jumping from land to land or from groove to groove at the time of still, a jump from groove to land or from land to groove, ie, 1 / A two-track jump can also be performed. The present invention has been made to solve the above-described problem when reproducing a disc on which such land / groove recording is performed.

Next, an embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing a total light receiving amount signal and a tracking error signal read from a disk on which land / groove recording is performed. The vertical axis represents the level and the horizontal axis represents the time. FIG. 1A shows a cross section of a groove (recess) and a land (convex) of a track, and FIG.
1 shows a total light receiving amount signal, and FIG. 1C shows a tracking error signal.

As shown in FIGS. 1 (a) and 1 (b), the intensity of the reflected light of the read beam becomes maximum at the groove and land portions of the track, and becomes minimum at the slope between the groove and land. Therefore, in the alternating current component of the total received light signal, the zero cross point is generated between the circle and the inclined portion at the center of each groove or land on the cross section of the track as shown in FIG. On the other hand, the tracking error signal shown in FIG. 1 (c) generates a zero-cross point at a point coincident with the recording track, that is, at the center of the groove and land, as in a normal recording disk. Therefore, the time of one cycle of the total received light amount signal is half the time of the tracking error signal.

In the land / groove recorded disk, the zero cross point of the total received light signal is twice as large as the zero cross point of the tracking error signal. The track crossing speed detecting device of the present invention utilizes this phenomenon, and generates a speed error signal from the total received light amount signal when reproducing a disk on which land / groove recording is performed, thereby achieving a speed servo response compared to the conventional device. This is to improve the performance.

FIG. 2 is a diagram for explaining a tracking speed error signal according to the present invention. 2 (a) to 2 (e)
Represents the level on the vertical axis and the time on the horizontal axis.
FIG. 2A shows the actual moving speed of the spot of the pickup, and FIG. 2B shows the total received light amount signal corresponding to FIG. 2A. It can be seen that the total received light amount signal changes rapidly as the spot moving speed increases. FIG.
FIG. 2C shows a pulse generated by detecting the zero-cross point of the total received light amount signal in FIG.

When a monostable multi that generates a pulse of a fixed width is triggered by the zero-cross pulse shown in FIG.
A pulse as shown in (d) is obtained. By integrating this pulse, a speed error signal as shown in FIG. 2 (e) can be obtained.

The speed error signal thus obtained is actually a value obtained by integrating the speed change during one sample period as shown in FIG. 2 (f). Inevitably causes a time delay. This is called a phase delay of the speed error signal.

Therefore, in order to reduce the phase delay, it is necessary to increase the sampling period. Therefore, the phase delay can be reduced by using the total received light amount signal on the land / groove disk as in the present invention.

FIG. 3 is a circuit block diagram of a track traversing speed detecting device showing an embodiment of the present invention. In FIG. 3, light receiving elements 1 and 2 for receiving reflected light of a reading light beam are light receiving elements for obtaining a total received light amount signal and a tracking error signal.

Each output of the light receiving elements 1 and 2 is supplied to a differential amplifier 8a. From the differential amplifier 8a, the light receiving element 1
And a signal corresponding to the level difference between the outputs of.
The output of the differential amplifier 8a is inverted in polarity by an inverting amplifier 8c, and a tracking error signal A is supplied to a changeover switch 8d.
Supplied as When the changeover switch 8d is selected for the signal A, the signal A is supplied to the equalizer amplifiers 9 and 15.

The tracking error signal A phase-compensated by the equalizer amplifier 9 is supplied to a tracking actuator 14 via a changeover switch 12 and a drive circuit 13. Tracking actuator 14
Is a movable section on which an objective lens (not shown) is mounted as described above, a supporting section for supporting the movable section, and a movable section for recording the movable section in response to a drive signal output from the drive circuit 13. And means for displacing in the radial direction. A drive signal corresponding to the tracking error signal is supplied from the drive circuit 13 to the tracking actuator 14, and control is performed so that the spot light for information detection accurately tracks the recording track.

As described above, the tracking servo loop alone cannot control the relative position of the information detection point over a wide range over the entire radius of the recording disk.

For this reason, the tracking actuator 1
4 is moved in the radial direction with respect to the recording track, and the relative position of the information detection point is controlled with low accuracy so that the information detection point is located substantially at the center of the control range of the tracking servo loop. A slider servo loop is formed as coarse adjustment means.

That is, the output of the changeover switch 8 d is phase-compensated by the equalizer amplifier 15 and supplied to the drive circuit 17 via the changeover switch 16. Drive circuit 1
The output of 7 is supplied to a slider motor 18 that radially drives a slider (not shown) on which the tracking actuator 14 is mounted.

On the other hand, the output of the differential amplifier 8a is also supplied to a low-frequency elimination filter 10 having a differentiating circuit composed of a capacitor C and a resistor R, and is compared with a ground level by a comparator 11. The edge detector 20 generates a pulse having a rising edge and a falling edge synchronized with the zero cross of the high frequency component of the tracking error signal by the comparator 11.

The pulse output from the edge detector 20 is supplied to the clock input terminal of the counter 22 and the trigger input terminal of the brake pulse generator 24. The counter 22 is supplied with jump number data indicating the number of tracks to jump from the controller 21. Counter 22
Is configured to preset jump data as a count value in response to a LOAD signal sent from the controller 21.

The counter 22 is supplied with a low-level EN signal from the output terminal of the D-type flip-flop 23. The JT signal output from the controller 21 is supplied to the clock input terminal of the D-type flip-flop 23, and the LOAD signal is supplied to the clear input terminal.

The D-type flip-flop 23 has a D
A power supply voltage is applied to the input terminal. Counter 22
Is configured to count down every time a clock is input only when the EN signal is output.
The output data of the counter 22 is supplied to the decoder 25. The decoder 25 outputs a high-level BRK signal when the output data value of the counter 22 reaches a predetermined value N, and outputs a high-level CLR signal when the output data value of the counter 22 becomes 0. It is configured to be.

The BRK signal and the CLR signal are used as trigger inputs of D-type flip-flops 26 and 27, respectively. These D-type flip-flops 26 and 27
A power supply voltage is applied to the D input terminal of the power supply. These D
The flip-flops 26 and 27 receive the BRK signal and C
When the LR signal is generated, the BRK signal and the CLR signal are set by the rising edge of the signal, and the BRK signal and the CLR signal are latched (stored and held). In addition, these D
The LOAD signal is supplied to the clear input terminals of the flip-flops 26 and 27.

The Q output of the D-type flip-flop 27 is supplied to an enable input terminal of the brake pulse generator 24. The brake pulse generator 24 is configured to output a brake pulse having a predetermined level for a predetermined time triggered by a signal output from the edge detector 20. The output of the brake pulse generator 24 is a subtraction input of the addition / subtraction circuit 28. The output of the acceleration pulse generator 29 is supplied to the addition / subtraction circuit 28 as an addition input.

The acceleration pulse generator 29 includes the controller 2
It is configured to output an acceleration pulse having a predetermined level over a predetermined time, triggered by a JT signal emitted from No. 1. The output of the addition / subtraction circuit 28 is supplied to the addition / subtraction circuit 30 as an addition input. The speed detection signal output from the speed detection circuit 31 is supplied to the addition / subtraction circuit 30 as a subtraction input, and the reference speed signal output from the changeover switch 32 is supplied as an addition input. The addition / subtraction circuit 30 outputs a speed error signal corresponding to the difference between the moving speed of the information detection point in the radial direction and the reference speed.

The outputs of the light receiving elements 1 and 2 are input to an amplifier 8b, and a total light receiving amount signal which is an added signal of them is output. The output of the amplifier 8b is supplied to a comparator 4 via a low-frequency elimination filter 3 having a differentiating circuit composed of a capacitor C and a resistor R, and compared with a ground level. The edge detector 20b generates a pulse having a rising edge and a falling edge synchronized with the zero cross of the high frequency component of the total received light signal by the comparator 4.

The speed detector 31 includes the edge detector 20
The output signal of b is supplied. In the speed detection circuit 31, this signal is a trigger input of the monostable multi 33. The Q output of this monostable multi 33 is
Is output as a speed detection signal having a voltage level corresponding to the moving speed of the information detection point in the radial direction.

The output voltages E1 and E1 of the constant voltage sources 35 and 36 are respectively connected to the two input terminals of the changeover switch 32.
2 is applied. The voltage E1 is set to be equal to the voltage level of the speed detection signal obtained when the frequency of the TZ signal output from the edge detector 20 is 10 kHz, for example.

The voltage E2 has a frequency of 4 k of the TZ signal.
The frequency is set to be equal to the voltage level of the speed detection signal obtained at Hz. The Q input of the D-type flip-flop 26 is supplied to the control input terminal of the changeover switch 32. When the D-type flip-flop 26 is in the reset state, that is, when the BRK signal is not latched, the voltage of the changeover switch 32 is changed. E1 is selectively output as the reference speed signal, and when the D-type flip-flop 26 is in the set state, that is, when the BRK signal is latched, the voltage E2 is selectively output as the reference speed signal. .

The speed error signal output from the adding / subtracting circuit 30 is directly supplied to one input terminal of the changeover switch 37 and at the same time, is changed via the inverting amplifier 38 to the changeover switch 3.
7 is supplied to the other input terminal. Changeover switch 3
The F / R signal output from the controller 21 is supplied to a control input terminal 7. The changeover switch 37 selectively outputs the output of the addition / subtraction circuit 30 when the F / R signal is at a low level, and selectively outputs the output of the inverting amplifier 38 when the F / R signal is at a high level. It is configured.

The output of the changeover switch 37 is supplied to the drive circuit 13 via the changeover switch 12 and simultaneously to the drive circuit 17 via the LPF 39 and the changeover switch 16. These changeover switches 12 and 16
Are supplied with a high-level TRKSW signal and a SLDSW signal from the controller 21.

The switch 12 selectively outputs the tracking error signal passed through the equalizer amplifier 9 when the TRKSW signal is not supplied, and outputs the speed error signal output from the switch 37 when the TRKSW signal is supplied. It is configured to selectively output a signal. The switch 16 selectively outputs the tracking error signal passed through the equalizer amplifiers 9 and 15 when the SLDSW signal is not supplied, and selects the speed error signal passed through the LPF 39 when the SLDSW signal is supplied. It is constituted so that it may output it.

The controller 21 is composed of, for example, a microcomputer, and calculates the number of tracks to be jumped by one jump operation in response to a search command, a double speed command, etc. generated by a key operation of an operation unit (not shown). After transmitting the track number data and the LOAD signal, the JT signal, TRKSW signal and SL
It is configured to send out a DSW signal.

In the above-described jump operation control device, the slider motor is forcibly driven by the signal obtained by integrating the speed error signal for driving the tracking actuator at the same time as the tracking actuator is driven during the jump operation. Since the tracking actuator is driven, the slider on which the tracking actuator is mounted moves at the same time as the tracking actuator is displaced.

As a result, the rate of change of the amount of deviation of the tracking actuator required to make the moving speed of the information detection point equal to the reference speed becomes small. Accordingly, the amount of deviation of the tracking actuator at the end of the jump operation becomes small, and the amount of movement of the slider that moves so that the amount of deviation of the tracking actuator becomes zero by the operation of the slider servo device after the end of the jump operation becomes small. The settling time of the slider servo device is reduced.

In the generation of the speed error signal, by using the total received light amount signal as described above, the period of the zero-cross detection can be made as short as half of the conventional period, so that the phase delay of the speed error can be reduced. Therefore, the track jump operation can be performed stably.

If the land width and the groove width are formed to be the same, the speed of the signal can be detected satisfactorily because the period of the total received light amount signal is stable. Further, even when the speed is detected by A / D conversion of the total received light amount signal, the phase delay due to the sampling similarly occurs, so that the present invention is effective.

[0076]

As described above, in the present invention, the speed of the spot is detected based on the period of the total amount of received light signal, which is a half period of the tracking error signal, and the speed error signal is generated. The influence of the phase delay due to sampling can be reduced as compared with the case where the spot speed is detected based on the signal period. Therefore, the response of the speed servo can be improved as compared with the conventional case where the speed is detected from the tracking error signal.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a total received light amount signal according to the present invention.

FIG. 2 is a diagram illustrating a tracking speed error signal according to the present invention.

FIG. 3 is a circuit block diagram of a track crossing speed detecting device according to an embodiment of the present invention.

FIG. 4 is a circuit block diagram of a conventional track crossing speed detecting device.

[Explanation of symbols]

 1, 2, 5, 6, 7 ··· Light receiving element 3 ··· Low pass filter 4 ··· Comparator 8c, 38 ··· Inverting amplifier 8d ··· Changeover switch 8a ··· · Differential amplifier 8b ····· Amplifier 9 and 15 ········································································································ Switch 13 Drive circuit 14 Tracking actuator 17 Drive circuit 18 Slider motor 20, 20a, 20b Edge detector 21 Controller 22 Counter 23 , 26, 27 D flip-flop 24 Brake pulse generator 25 Decoder 28, 30 Addition / subtraction circuit 2 .... acceleration pulse generator 31 ... speed detecting circuit 33 ... monostable 34, 39 ... LPF 35, 36 ... constant voltage source

Claims (6)

[Claims] A fine adjustment means for adjusting a relative position of a spot of a pickup so as to follow a reading track of the disk; and adjusting the pickup to the radius of the disk so that the spot is within a control range of the fine adjustment means. Coarse adjustment means for adjusting the movement in the direction; speed detection means for generating a speed detection signal corresponding to the moving speed of the spot with respect to the disk; speed corresponding to a difference between the speed detection signal and a reference speed signal representing a predetermined reference speed. A speed error signal generating means for generating an error signal; and reading a land / groove recorded disk in which both or one of the fine adjustment means and the coarse adjustment means can be forcibly driven by the speed error signal. In the apparatus for controlling a track traversing speed of a disc player, the speed detection signal is Track crossing speed detecting apparatus of the disc player, characterized in that it is generated based on the cycle of the total amount of received light signal detected by up. And a tracking error detecting means for obtaining a tracking error signal corresponding to a deviation amount of the spot with respect to a track in a radial direction of the disk.
2. The apparatus according to claim 1, wherein the apparatus is driven by a drive signal generated based on the tracking error signal. 3. The track crossing speed detecting device for a disk player according to claim 1, wherein the cycle of the total received light amount signal is detected by zero-cross detection of a high-frequency component of the total received light amount signal. . 4. The track traversing speed of a disk player according to claim 1, wherein the land groove disk has a land width and a groove width formed to be substantially the same. Detection device. 5. An integrating means for integrating the speed error signal, wherein the fine adjusting means is forcibly driven by the speed error signal in response to a command and the coarse adjusting means is forcibly driven by an output of the integrating means. By driving to
5. The track crossing speed detecting device for a disk player according to claim 1, wherein a track jump operation is performed. 6. The land-groove disk according to claim 1, wherein the period of the detected total received light amount signal is の of the period of the tracking error signal.
6. The track crossing speed detecting device for a disk player according to any one of items 5 to 5.