JPH08255356A - Information processor - Google Patents

Abstract

PURPOSE: To accurately and easily access a desired track based on a periodical signal showing a track position without being influenced by noise caused by a peripheral circuit and the error of a circuit adjustment, etc., at the time of accessing the desired track. CONSTITUTION: In an access control circuit 40, a time between leading edges and a time between trailing edges from the central potential of a tracking error signal are measured by a leading counter 45 and a trailing counter 46 respectively in parallel, and the moving speed (present speed) of an optical head 3 at that time is calculated by a present speed calculating part 49 based on the above measured times. Then, the moving speed is compared with a reference speed stored in a reference speed storage part 51 at intervals of a half period of the tracking error signal, and based on this difference, the moving speed of the optical head 3 is adjusted to become the reference speed by a linear motor control circuit 17 at intervals of a half period of the tracking error signal.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disc-shaped information recording medium, for example, an information processing apparatus for recording and reproducing information by accessing a desired track position formed on an information recording surface of an optical disc.

[0002]

2. Description of the Related Art For example, an optical disk device is known as an information processing device for recording and reproducing information on a disc-shaped information recording medium. In an optical disc used in such an optical disc device, for example, information is recorded along a track (groove) formed by spirally expanding in the radial direction.

In an optical disk apparatus for recording and reproducing information on such an optical disk, the optical head accesses a desired track of the optical disk to record information along the track or to the track. It is designed to read the information recorded along with it. When the optical head accesses a desired track on the optical disk, the optical head is moved to the desired track while adjusting the moving speed of the movable portion of the optical head.

The adjustment of the moving speed of the optical head is based on the error by comparing a predetermined moving speed value (reference speed) with the actual moving speed of the optical head (current speed). The actual moving speed (current speed) of the optical head is adjusted. At this time, if the actual moving speed (current speed) of the optical head does not match the reference speed, the optical head cannot move to a desired track accurately, and the moving speed of the optical head is strictly adjusted. There is a need.

The current speed of the optical head is a periodic signal indicating the position of the track detected when the optical head moves across the track on the optical disk, that is,
It can be measured based on a sine waveform signal (tracking error signal or push-pull signal). That is, the movement time between tracks is measured by using a counter or the like with the center potential of the signal waveform, that is, the zero-cross potential as a reference value (threshold), and the width between the tracks is Since it is always constant, the current speed v can be calculated by the following equation (1). v = (moving time between tracks) / (1 track width) (1)

[0006]

As described above, when the current speed is calculated by measuring the time for each track, that is, for each cycle of the tracking error signal, the moving speed (current speed) of the optical head is calculated. The time for one cycle of the tracking error signal increases as the speed decreases. As a result, there is a problem in that the accuracy of the moving speed adjustment deteriorates due to the delay of the control system of the moving speed of the optical head. Therefore, the measurement of the current speed of the optical head is performed using the tracking error signal 1
It is desirable to increase the frequency of measurement rather than every cycle.
However, for example, when the measurement is performed every half cycle, as shown in FIG. 5, the center potential P of the signal of the sine waveform which is the tracking error signal may have a sine waveform due to noise due to peripheral circuits or an error in circuit adjustment. There may be a deviation (offset deviation) from the actual center potential Q of. In that case, the potential of the tracking error signal is alternately shifted between the half period measurement time ta above the center potential P and the half period measurement time tb below the center potential P, and accurate time measurement for each half period is possible. Can not. Therefore, there is a problem in that an accurate value of the current speed of the optical head cannot be calculated, adjustment accuracy of the moving speed is deteriorated, and the optical head cannot be accurately moved to a desired track.

Therefore, according to the present invention, when a desired track is accessed, the desired signal can be obtained based on a periodic signal indicating the position of the track without being affected by noise due to peripheral circuits, error in circuit adjustment and the like. An object of the present invention is to provide an information processing device that enables accurate and easy access to a truck.

[0008]

An information processing apparatus according to the present invention is an information processing apparatus for accessing a track formed on an information recording surface of a disc-shaped information recording medium to record and reproduce information. Information recording / reading means for recording information and / or reading the recorded information along tracks formed on the information recording surface of the information recording medium, and the information recording / reading means along the radial direction of the information recording medium. Corresponding to a moving means for moving to a desired track and a track passed by the information recording / reading means when the information recording / reading means moves across the track formed on the information recording surface of the information recording medium. Output means for outputting a periodic signal indicating the position of the information recording / reading means to be detected with respect to the track, and the periodic signal output by the output means. The moving speed of the information recording / reading means is determined based on the time interval for one cycle of the periodic signal and the width between the tracks, which are periodically measured corresponding to the predetermined reference value. The information recording / reading means is operated at the reference speed by comparing the calculating means for calculating at least twice within one cycle of the periodic signal with the moving speed calculated by the calculating means and a predetermined reference speed. And a control means for controlling the movement.

Further, the information processing apparatus of the present invention is an information processing apparatus for recording and reproducing information by accessing a track formed on an information recording surface of a disc-shaped information recording medium. Information recording / reading means for recording information and / or reading the recorded information along a track formed on the information recording surface, and a desired information recording / reading means along the radial direction of the information recording medium. The moving means for moving to the track and the information recording / reading means are detected corresponding to the track passed by the information recording / reading means when moving across the track formed on the information recording surface of the information recording medium. Output means for outputting a periodic signal indicating the position of the information recording / reading means with respect to the track, and a predetermined periodic signal output by the output means. Time between the rising edge with respect to the reference value, and measuring means for measuring the respective time between a falling edge, when the time between the rising edge, the time between falling edges measured in the measuring means,
Based on the time and the width of one track, the calculating means for calculating the moving speed of the information recording / reading means and the moving speed calculated by the calculating means are compared with a predetermined reference speed. And a control means for controlling the information recording / reading means to move at the reference speed.

Further, the information processing apparatus of the present invention is arranged such that a plurality of tracks formed on the information recording surface of the information recording medium are
In an information processing device for recording or reproducing information by a light beam, information recording and reading means for recording information or reproducing the recorded information by irradiating a light beam following the track, and the information recording and reading means. Moving means for moving the irradiation light beam to a desired track across the plurality of tracks, and periodically for each irradiation light beam moved by the moving means to cross the plurality of tracks. Output means for outputting a signal for zero-crossing, a first measuring means for measuring the time between rising edges of the points for zero-crossing of the signal output by this output means, and the above-mentioned for the signal output by the output means. Second measuring means for measuring the time between the falling edges of the zero-cross points, the first measuring means, and the second measuring means. The irradiation light beam is compared with the calculation means for calculating the moving speed of the irradiation light beam based on the measurement result of the measuring means, the moving speed calculated by the calculation means, and a predetermined reference speed. And a control means for controlling the moving means so as to move at a reference speed.

Further, the information processing apparatus of the present invention is arranged such that a plurality of tracks formed on the information recording surface of the information recording medium are
In an information processing device for recording or reproducing information by a light beam, information recording and reading means for recording information or reproducing the recorded information by irradiating a light beam following the track, and the information recording and reading means. Moving means for moving the irradiation light beam to a desired track across the plurality of tracks, and periodically for each irradiation light beam moved by the moving means to cross the plurality of tracks. Output means for outputting a signal for zero-crossing, first measuring means for measuring the time between rising edges of the zero-crossing points of the signal output by the output means, and measurement processing by the first measuring means. In parallel, a second meter for measuring the time between the falling edges of the zero-crossing points of the signal output by the output means. Means, a calculating means for calculating the moving speed of the irradiation light beam based on the measurement results of the first measuring means and the second measuring means, and the moving speed calculated by the calculating means, And a control means for controlling the moving means so that the irradiation light beam moves at the reference speed.

Further, the information processing apparatus of the present invention is an information processing apparatus which records or reproduces information by a light beam with respect to a plurality of tracks formed on an information recording surface of an information recording medium. Information recording / reading means for irradiating a light beam to record information or reproducing recorded information, and by moving the information recording / reading means, the irradiation light is irradiated onto a desired track across the plurality of tracks. Between the moving means for moving the beam, the detecting means for detecting the tracking error of the irradiation light beam with respect to the track and outputting the track error, and the rising edge of the zero crossing point of the track error signal output by the detecting means. Output by the detecting means in parallel with the first measuring means for measuring time and the measuring process by the first measuring means. Second to measure the time between the falling edge of the point of zero crossing of the track error signal
Measuring means, calculating means for calculating the moving speed of the irradiation light beam based on the measurement results of the first measuring means and the second measuring means, and the moving speed calculated by the calculating means, And a control means for controlling the moving means so that the irradiation light beam moves at the reference speed by comparing with a predetermined reference speed.

[0013]

The information recording / reading means for recording information and / or reading the recorded information along the track formed on the information recording surface of the disc-shaped information recording medium is arranged along the radial direction of the information recording medium. When moving to a desired track across a track formed on an information recording surface, a periodical pattern indicating the position of the information recording / reading unit with respect to the track detected corresponding to the track passed by the information recording / reading unit. For each signal, the time between the rising edges and the time between the falling edges with respect to a predetermined reference value are measured, and the time interval for one cycle of the periodic signal and the width between one tracks are also measured. In addition, the moving speed of the information recording / reading means at that time is calculated twice within one cycle of the periodic signal, and when the moving speed is calculated, the moving speed is roughly calculated as the moving speed. By adjusting the information recording / reading means so as to move at the reference speed by comparing with a predetermined reference speed, noises due to peripheral circuits, influence of circuit adjustment error, etc. are affected when a desired track is accessed. The accurate moving speed of the information recording medium can be measured twice within one cycle of the periodic signal based on the periodic signal indicating the position of the track, and therefore, the information recording / reading is performed. The moving speed of the means can be adjusted accurately, and the desired track can be accessed accurately and easily.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows an optical disk device as an information processing device for reproducing information from a disc-shaped information recording medium of the present invention. On the information recording surface of the optical disc 1,
Along the radial direction, for example, recording tracks spread in a spiral shape are formed.

The optical disk 1 is rotated by a motor 2 at a constant speed, for example. The motor 2 is controlled by a motor control circuit 18. The reproduction of information on the optical disc 1 is performed by the optical head 3.
The optical head 3 is fixed to a drive coil 13 that constitutes a movable portion of a linear motor (moving means) 31, and the drive coil 13 is connected to a linear motor control circuit 17.

Further, a permanent magnet (not shown) is provided on the fixed portion of the linear motor 31, and the drive coil 13 is excited by the linear motor control circuit 17 to move the optical head 3 in the radial direction of the optical disc 1. It is like this. The moving speed of the optical head 3 at this time is controlled by the access control circuit 40.

An objective lens 6 is held on the optical head 3 by a wire or a leaf spring (not shown). The objective lens 6 is driven by a driving coil (lens actuator) 5 in the focusing direction (optical axis direction of the lens). It is moved and can be moved in the tracking direction (direction orthogonal to the optical axis of the lens) by the drive coil (lens actuator) 4.

The laser light generated by the semiconductor laser oscillator 9 driven by the laser control circuit 14 is
The optical disc 1 is irradiated with light through the collimator lens 11a, the half prism 11b, and the objective lens 6, and the reflected light from the optical disc 1 passes through the objective lens 6, the half prism 11b, the condenser lens 10a, and the cylindrical lens 10b. It is guided to the photodetector 8.

The photodetector 8 is a 4-division photodetector cell 8.
It is composed of a, 8b, 8c and 8d. The output signal of the photodetector cell 8a of the photodetector 8 is the amplifier 12a.
Is supplied to one end of each of the adders 30a and 30c, the output signal of the photodetector cell 8b is supplied to one end of each of the adders 30b and 30d via the amplifier 12b, and the output signal of the photodetector cell 8c is supplied to the amplifier 12c. Via adders 30b, 30c
The output signal of the photodetection cell 8d is supplied to the other ends of the adders 30a and 30d via the amplifier 12d.

The output signal of the adder 30a is supplied to the inverting input terminal of the differential amplifier OP1.
The output signal of the adder 30b is supplied to the non-inverting input terminal of. The output signals of the adders 30a and 30b are supplied to the adder 30e. The output signal of the adder 30e is supplied to the signal processing circuit 19.

The differential amplifier OP1 includes the adder 30a,
A tracking error signal is output according to the difference of 30b. Here, the tracking error signal will be described with reference to FIG. In FIG. 2, the optical head 3 is supported so as to be movable in the radial direction of the optical disc 1. The optical head 3 moves in the radial direction of the optical disc 1,
When moving to a desired track across a track (groove) R spirally formed on the information recording surface of the optical disc 1, a tracking error signal is detected corresponding to the track passed by the optical head 3, The signal is output as a signal of a periodic sine waveform that shows the movement of one track of the head 3 as one period. For example, as shown in FIG. 2, when the optical head 3 passes through the center position of a track (groove), it crosses the center potential when the potential indicated by the amplitude of the tracking error signal changes from the maximum point to the minimum point. Even when the optical head 3 passes the center position of the next track, it is also detected as when the optical head 3 crosses the same position in the next cycle of the sine waveform.

The tracking error signal is supplied to the tracking control circuit 16 and the access control circuit 40. The access control circuit 40 controls the moving speed of the optical head 3 to a predetermined reference speed based on the tracking error signal according to the number of tracks passed to move to a desired track supplied from the CPU 23. To do.

The tracking control circuit 16 creates a track drive signal according to the tracking error signal supplied from the differential amplifier OP1 when the access control circuit 40 notifies that the desired track has been accessed. Is.

The track drive signal output from the tracking control circuit 16 is supplied to the drive coil 4 in the tracking direction to perform fine movement adjustment for tracking.

The linear motor control circuit 17 has a drive coil (conductor) 13 in a linear motor 31 which will be described later in accordance with the moving speed control signal from the access control circuit 40 and the number of tracks passing to move to a desired track. The voltage corresponding to the moving speed is applied to.

The linear motor control circuit 17 uses an electrical change inside the drive coil 13 at the moment when the drive coil 13 in the linear motor 31 described later crosses a magnetic flux generated by a magnetic member (not shown). , Drive coil 1
A speed detection circuit (not shown) for detecting the relative speed between the magnetic member 3 and the magnetic member, that is, the moving speed of the linear motor 31 is provided.

The output signal of the adder 30c is supplied to the inverting input terminal of the differential amplifier OP2, and the output signal of the adder 30d is supplied to the non-inverting input terminal of the differential amplifier OP2. As a result, the differential amplifier OP2 supplies the focusing control circuit 15 with a servo signal regarding the focus point according to the difference between the adders 30c and 30d. The output signal of the focusing control circuit 15 is supplied to the drive coil 5 in the focusing direction, and the laser beam is controlled so that the laser beam is always in perfect focus on the optical disc 1.

The photodetector cells 8a to 8 of the photodetector 8 in the state where focusing and tracking are performed as described above.
The sum signal of the outputs of d, that is, the output signals from the adders 30a and 30b reflect the change in the reflectance from the pits (recording information) formed on the track R. This signal is supplied to the signal processing circuit 19, and this signal processing circuit 1
At 9, recorded information, its address information (track number, sector number, etc.) and the like are reproduced.

The recorded information reproduced by the signal processing circuit 19 is transferred to the memory 24 via the bus 10. Then, subsequent processing is performed on the reproduction information stored in the memory 24.

In addition, in front of the laser control circuit 14, a recording signal generating circuit 33 as a modulation circuit for modulating the recording signal.
Is provided. Further, in this optical disc device, a D / A converter 22 used for exchanging information between the focusing control circuit 15, the tracking control circuit 16, the linear motor control circuit 17 and the CPU 23, respectively.
Is provided.

The tracking control circuit 16 includes the C
The objective lens 6 is moved in accordance with the track jump signal supplied from the PU 23 via the D / A converter 22.
The beam light is moved by the amount of the track.

The laser control circuit 14, focusing control circuit 15, tracking control circuit 16, linear motor control circuit 17, motor control circuit 18, signal processing circuit 1
9. The recording signal generation circuit 33 and the like are connected to the CP via the bus 20.
It is controlled by U23, and this CP
The U23 is adapted to perform a predetermined operation according to a program stored in the memory 24.

The position of the objective lens 6 is detected by the lens position detector 21 using an optical sensor, and the detection signal is supplied to the lens position sensor circuit 24. A lens position sensor signal from the lens position sensor circuit 24 is output to the linear motor control circuit 17, and the linear motor 31 is excited by the linear motor control circuit 17 to position the lens 6 at a predetermined position, for example, a home position. .

Next, the configuration of the access control circuit 40 will be described with reference to FIG. In FIG. 3, the same parts as those in FIG. 1 are designated by the same reference numerals. In FIG. 3, the access control circuit 40 surrounded by a broken line is
The tracking error signal output from the differential amplifier OP1 is supplied, and the tracking error signal is input to the rising counter 45 and the falling counter 46 of the access control circuit 40. A reference clock of, for example, 18 MHz is input from the clock output unit 47.

As shown in FIG. 4, the rising counter 45 and the falling counter 46 use the predetermined potential of the tracking error signal, that is, the center potential P of the sine waveform as a reference value, and the rising counter 45 The time tu between rising edges that cross from the bottom to the top with respect to the center potential P of the tracking error signal is measured based on the reference clock, and the falling counter 46 measures from the top to the bottom with respect to the center potential P of the tracking error signal. The time td between the falling edges traversing each other is measured in parallel based on the reference clock. still,
At this time, the center potential P of the tracking error signal may be affected by noise due to peripheral circuits, error in circuit adjustment, or the like.
There is a deviation (offset deviation) of the sine waveform from the actual center potential Q. However, the time t measured by the rising counter 45 and the falling counter 46 is
u and td are measured for each cycle of the sine waveform and are not affected by the offset deviation described above.

When the rising counter 45 and the falling counter 46 measure the times tu and td, the times tu and td are latched by the latch circuit 48 every half cycle of the tracking error signal. . That is, it is latched at the latch timing shown in FIG.

In the present speed calculator 49, the latch circuit 48
Then, based on the times tu and td latched every half cycle,
The moving speed of the optical head 3 at that time, that is, the current speed v is calculated. The calculation method can be calculated by the above-mentioned formula (1) from the width between one track obtained in advance. Therefore, the current speed calculation unit 49 is configured to calculate the current speed of the optical head 3 for each half cycle of the tracking error signal.

When the rising counter 45 and the falling counter 46 measure the times tu and td, for example, the rising counter 45 and the falling counter 46 are used.
Then, when the rising edge and the falling edge are not detected and the time tu and the time td cannot be measured, an error notification is transmitted to the CPU 23 via the bus 20.

On the other hand, when the movement of the optical head 3 to a desired track is started, the CPU 23 controls the track counter 50.
The number of tracks to be moved by the optical head 3 is transmitted from the bus 20 via the bus 20. For example, the number of tracks to be moved is decremented one by one based on the timing at which the time td between the falling edges is latched by the latch circuit 48. It manages the number of remaining tracks. Then, for example, when the number of remaining tracks becomes zero, the CPU 23 is notified of that fact.

The reference speed storage unit 51 stores a reference speed corresponding to the number of remaining tracks managed by the track counter 50, and each time the counter value in the track counter 50 is updated, the counter value, That is, the reference speed is designated and read according to the number of remaining tracks at that time.

The reference speed read from the reference speed storage unit 51 and the optical head 3 calculated by the current speed calculation unit 49.
The current speeds of the two are compared in the comparison circuit 52 to obtain the speed difference between them. That is, in the comparison circuit 52,
The speed difference between the reference speed and the current speed is obtained according to the latch timing of the tracking error signal for each half cycle.

The difference between the reference speed and the current speed output from the comparison circuit 52 as a digital signal is converted into an analog signal according to the value in the D / A converter 53, and the linear motor control circuit 17 is supplied as a speed control signal. Is output to.

The track-on timing detection circuit 54
The timing at which the optical head 3 reaches the desired center position of the track is detected based on the number of remaining tracks managed by the track counter 50 and the tracking error signal. The detected timing signal is output to the linear motor control circuit 17 and the tracking control circuit 16.

In the linear motor control circuit 17, a voltage is applied to the drive coil 13 according to the speed control signal from the D / A converter 53, and the optical head 3 is driven at the reference speed previously stored in the reference speed storage unit 51. Is controlled so as to move in the radial direction of the optical disc 1, and when the timing signal is detected from the track-on timing detection circuit 54, control is performed so as to end the movement of the optical head 3.

The tracking control circuit 16 outputs a differential amplifier O when the track-on timing detection circuit 54 outputs the timing signal, that is, when the optical head 3 is notified that a desired track is accessed.
A track drive signal is created according to the tracking error signal supplied from P1 and is supplied to the drive coil 4 to perform fine movement adjustment for tracking.

In the access control circuit 40 configured as described above, the center potential P is set as the reference potential for the tracking error signal, and the time tu between the rising edges and the time td between the falling edges with respect to this reference potential.
Are measured in parallel by the rising counter 45 and the falling counter 46, respectively, and the moving speed (current speed) of the optical head 3 at that time is calculated by the current speed calculating unit 49 based on the measured values. The reference speed stored in the reference speed storage unit 51 is compared with the calculated current speed for each half cycle of the signal, and the moving speed of the optical head 3 is determined as the reference speed by the linear motor control circuit 17 based on the difference. By adjusting the tracking error signal at every half cycle timing as shown in FIG. 4, the actual center of the sine waveform is added to the center potential P of the tracking error signal due to noise from the peripheral circuits or circuit adjustment error as shown in FIG. Even when there is a deviation (offset deviation) with respect to the potential Q, the rising counter 45 and the falling counter 46. Since the measured times tu and td are measured for each cycle of the sine waveform, the moving speed (current speed) of the optical head 3 at that time is accurately affected by the deviation of the offset described above. Therefore, the moving speed of the optical head 3 can be adjusted accurately and easily, and the desired track can be moved or accessed accurately and easily.

Although the reference value defined for the tracking error signal is the center potential P of the sine waveform in the above embodiment, the present invention is not limited to this case and can be applied. That is, for example, if two reference values are set for the tracking error signal, four counters are provided so that the time interval between the rising edge and the falling edge corresponding to the reference value can be measured in parallel. The speed of the current speed can be measured for each 1/4 cycle of the error signal, and the moving speed of the optical head can be adjusted more accurately.

[0048]

As described above, according to the present invention, when a desired track is accessed, a periodic signal indicating the track position is not affected by noise due to peripheral circuits, circuit adjustment error, and the like. Based on the above, it is possible to provide an information processing apparatus capable of accurately and easily accessing a desired track.

[Brief description of drawings]

FIG. 1 is a block diagram showing an overall configuration of an optical disc device according to an embodiment of the present invention.

FIG. 2 is a diagram for explaining a tracking error signal.

FIG. 3 is a block diagram showing a configuration of an access control circuit.

FIG. 4 is a waveform diagram for explaining a method of measuring a current speed for each half cycle based on a tracking error signal.

FIG. 5 is a waveform diagram for explaining a conventional method of measuring a current speed for each half cycle based on a tracking error signal.

[Explanation of symbols]

1 ... Optical disc, 3 ... Optical head, 16 ... Tracking control circuit, 17 ... Linear motor control circuit, 23 ... CP
U, 24 ... Memory, 40 ... Access control circuit.

Claims (5)

[Claims] 1. An information processing apparatus for recording and reproducing information by accessing a track formed on an information recording surface of a disc-shaped information recording medium, the information processing apparatus being formed on the information recording surface of the information recording medium. Information recording / reading means for recording information along the track and / or reading the recorded information; moving means for moving the information recording / reading means to a desired track along the radial direction of the information recording medium; The track of the information recording / reading means detected corresponding to the track passed by the information recording / reading means when the information recording / reading means moves across the track formed on the information recording surface of the information recording medium. The output means for outputting a periodic signal indicating the position relative to, and a cycle corresponding to a predetermined reference value for the periodic signal output by the output means. Based on the time interval of one cycle of the periodic signal measured and the width between one track, the moving speed of the information recording / reading means is at least twice within one cycle of the periodic signal. And a control means for comparing the moving speed calculated by the calculating means with a predetermined reference speed to control the information recording / reading means to move at the reference speed. An information processing device characterized by: 2. An information processing apparatus for recording and reproducing information by accessing a track formed on an information recording surface of a disc-shaped information recording medium, the information processing apparatus being formed on the information recording surface of the information recording medium. Information recording / reading means for recording information along the track and / or reading the recorded information; moving means for moving the information recording / reading means to a desired track along the radial direction of the information recording medium; The track of the information recording / reading means detected corresponding to the track passed by the information recording / reading means when the information recording / reading means moves across the track formed on the information recording surface of the information recording medium. An output means for outputting a periodic signal indicating a position relative to, and a rising edge with respect to a predetermined reference value for the periodic signal output by the output means. Measuring means for measuring the time between edges and the time between falling edges, respectively, and when this measuring means measures the time between rising edges and the time between falling edges, the time and the width between one track Based on the above, the calculating means for calculating the moving speed of the information recording / reading means, and the moving speed calculated by the calculating means and a predetermined reference speed are compared, and the information recording / reading means is used as the reference. An information processing apparatus comprising: a control unit that controls to move at a speed. 3. An information processing apparatus for recording or reproducing information with a light beam on a plurality of tracks formed on an information recording surface of an information recording medium, wherein the information is obtained by irradiating the track with a light beam. Information recording / reading means for recording or reproducing recorded information, and moving means for moving the information recording / reading means to move the irradiation light beam to a desired track across the plurality of tracks. Between the rising edge of the zero-crossing point of the signal output by the output means, the output means outputs a signal that periodically zero-crosses each time the irradiation light beam is moved by the moving means and crosses the plurality of tracks. Of the signal output by the output means and the trailing edge of the zero crossing point of the signal output by the output means. A second measuring means for measuring the time between the two, a calculating means for calculating the moving speed of the irradiation light beam based on the measurement results of the first measuring means and the second measuring means, and this calculating means And a control means for controlling the moving means so that the irradiation light beam moves at the reference speed by comparing the moving speed calculated by the above-mentioned method with a predetermined reference speed. Information processing device. 4. An information processing apparatus for recording or reproducing information with a light beam on a plurality of tracks formed on an information recording surface of an information recording medium, the information being obtained by irradiating the track with a light beam. Information recording / reading means for recording or reproducing recorded information, and moving means for moving the information recording / reading means to move the irradiation light beam to a desired track across the plurality of tracks. Between the rising edge of the zero-crossing point of the signal output by the output means, the output means outputs a signal that periodically zero-crosses each time the irradiation light beam is moved by the moving means and crosses the plurality of tracks. Is output by the output means in parallel with the measurement processing by the first measurement means for measuring the time Second measuring means for measuring the time between the falling edges of the zero-crossing points of the signal, and the moving speed of the irradiation light beam based on the measurement results of the first measuring means and the second measuring means. And a control for controlling the moving means so that the irradiation light beam moves at the reference speed by comparing the moving speed calculated by the calculating means with a predetermined reference speed. An information processing device comprising: 5. An information processing apparatus for recording or reproducing information with a light beam on a plurality of tracks formed on an information recording surface of an information recording medium, the information being obtained by irradiating a light beam following the tracks. Information recording / reading means for recording or reproducing recorded information, and moving means for moving the information recording / reading means to move the irradiation light beam to a desired track across the plurality of tracks. A detection unit that detects a tracking error of the irradiation light beam with respect to the track and outputs a track error, and a first measurement that measures a time between rising edges of a zero-crossing point of the track error signal output by the detection unit. Means and zero of the track error signal output by the detecting means in parallel with the measurement processing by the first measuring means. Second measurement means for measuring the time between the falling edges of the lost points, and calculation for calculating the moving speed of the irradiation light beam based on the measurement results of the first measurement means and the second measurement means. Means for comparing the moving speed calculated by the calculating means with a predetermined reference speed to control the moving means so that the irradiation light beam moves at the reference speed. An information processing device comprising: