JPH08194952A - Optical information recorder/reproducer - Google Patents

Abstract

PURPOSE: To prevent off-tracking of light beam by suppressing AT error at the time of deceleration of an ultrasonic motor. CONSTITUTION: The optical information recorder/reproducer comprises an objective lens 329 for condensing a light beam onto an optical card 9c, an AT actuator for shifting the objective lens in the tracking direction, a movable optical head 301 provided with the objective lens and the AT actuator, and an ultrasonic motor 128 for shifting the movable optical head 301 and the optical card 9c relatively in the direction for traversing the track. Driving signal for the ultrasonic motor 128 is then decreased at a predetermined rate and then decreased exponentially. When the ultrasonic motor 128 is decelerated, variation rate of the driving signal is decreased stepwise for the ultrasonic motor 128.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical information recording / reproducing apparatus for optically recording or reproducing information on a card-shaped information recording medium, and more particularly to driving a recording medium or an optical head, for example, an ultrasonic motor. The present invention relates to control when moving in the track crossing direction.

[0002]

2. Description of the Related Art In recent years, as an information recording / reproducing apparatus for recording / reproducing information on / from a recording medium, an optical information recording / reproducing apparatus for optically recording / reproducing by using a light beam has been attracting attention. There are disc-shaped and card-shaped recording media for optically recording and reproducing information. Among them, card-shaped recording media (hereinafter referred to as optical cards) are productivity, portability, and accessibility. Excellent,
It has a wide range of uses. Information is recorded on a recording medium by scanning an information track with a light beam in the form of a minute spot modulated according to the recorded information, and the information is recorded as an optically detectable information bit string.

Further, in order to reproduce information from a recording medium,
Scan the information bit string of the information track with a light beam spot with a constant power such that recording is not performed on the recording medium,
This is performed by detecting reflected light or transmitted light from the recording medium. The optical head used for recording / reproducing information on / from such a recording medium is movable relative to the recording medium in the information track direction and in the direction traversing the track. A scan is performed on the track.

The optical head is provided with a focusing lens for narrowing the light beam spot, and an objective lens is used as this lens. This objective lens is designed so that it can be independently moved in each direction with respect to the optical head main body in the optical axis direction (focusing direction) and in a direction (tracking direction) orthogonal to both the optical axis direction and the information track direction of the recording medium. Held in. Such holding of the objective lens is generally performed via an elastic member,
Focusing and movement in the tracking direction of the objective lens are generally driven by an actuator utilizing magnetic interaction.

FIG. 9 shows a schematic plan view of a write-once type optical card. On the information recording surface of the optical card 1000, a number of information tracks 1001 are arranged in parallel in the LF direction. A home position 1002, which is a reference position for accessing the information track 1001, is provided on the information recording surface of the optical card 1000. Information track 1
001 is from the position closer to the home position 1002,
.. 1001-1, 1001-2, 1001-3 ... Are arranged adjacent to these information tracks as shown in FIG.
-2, 1003-3 ... Are provided. These tracking tracks are used as guides for auto-tracking (hereinafter abbreviated as AT) that controls the light beam spot so that it does not deviate from a predetermined information track when scanning the light beam spot during information recording / reproduction.

In this AT control, the optical head detects a deviation (AT error) of a light beam spot from an information track and negatively feeds back the detected information to a tracking actuator which drives an objective lens in the tracking direction. The objective lens is moved in the tracking direction (D direction) with respect to the main body of the optical head so that the light beam spot follows the desired information track. Further, the AT control is to use a light spot S ₁ and S _3, and so as to utilize the reflected light from the tracking to be irradiated with light spot S _1, S _3, and these two light spots S ₁ Information is recorded / reproduced by a light spot S ₂ located between S ₃ and S ₃ . The light spot S
_The same light source is used as the light sources for S ₁ , S ₂ and S ₃ , and the light spots S ₂ are equally spaced on both sides of the light spot S ₂ due to the interference effect of the diffraction grating arranged between the light source and the objective lens.
₁ , S ₃ are formed.

Further, when the information track is scanned with the light beam spot during information recording / reproduction, the light beam is made into a spot having an appropriate size on the surface of the optical card (focusing).
For this reason, autofocusing (hereinafter abbreviated as AF) control for the objective lens is performed. This AF control is
The optical head detects the deviation (AF error) of the light beam spot from the in-focus state, negatively feeds back this detection signal to a focusing actuator that moves the objective lens along the optical axis direction, and the objective is directed to the optical head body. The light beam spot is focused on the optical card surface by moving the lens in the focusing direction.

On the other hand, as a method of relative scanning between a light beam emitted from a semiconductor laser of a light source and an optical card, a table that does not move in the track direction of the optical card but can move in a direction crossing the track (hereinafter An optical card is mounted on a carriage), and the optical head main body is moved in the track direction by using a voice coil motor, thereby scanning the light beam on the information track. Further, when the light beam is moved in the cross-track direction, the carriage is moved in the direction crossing the track, and an ultrasonic motor is used to move the carriage.

In the optical information recording / reproducing apparatus having such a structure, the reason why the carriage is moved in the direction orthogonal to (crossing) the information track is to access another information track. In this case, Conventionally, the AT control is turned off to allow high speed access. Secondly, if the parallelism between the tracks on the optical card and the scanning system in the track direction is deviated (hereinafter referred to as skew), as in the case where the optical card is not properly mounted on the carriage, AT control is performed. If scanning is performed in the track direction in the ON state, the objective lens is drive-controlled so as to be displaced with respect to the optical head body. In such a case, the amount of displacement of the objective lens with respect to the main body of the optical head is limited, and the amount of displacement may reach its limit during scanning of the track. This is because the deviation of the objective lens with respect to the optical head main body is made within the allowable range by moving the objective lens to.

Here, the structure and driving principle of the ultrasonic motor will be briefly described. As an ultrasonic motor, an elastic body made of a metal having a low vibration damping property, for example, a ring-shaped vibrating body in which a piezoelectric element is adhered and fixed to the bottom surface of a ring-shaped elastic body with an adhesive or the like is used. The ring-shaped moving body is brought into pressure contact with the pressure means via the pressure means. On the other hand, the piezoelectric element has A and B two-phase piezoelectric element groups having an interval of an odd multiple of 1/4 (wavelength), and λ is provided in each group.
Piezoelectric elements having an interval of / 2 and having different polarization treatment directions in the thickness direction are formed. And this A, B2
By applying a frequency voltage such as an alternating voltage having a phase difference of 90 ° to the two-phase piezoelectric element groups, standing waves are excited by the A and B two-phase piezoelectric element groups, respectively, and the surface particles of the elastic body are synthesized by their synthesis. A traveling wave that travels in the circumferential direction is formed on the moving body, and the moving body is rotated by frictional driving of the moving body.

FIG. 11 is a block diagram showing an example of an optical card recording / reproducing apparatus for recording / reproducing information on / from an optical card. 2 in the figure
00 is an optical card, which is an information recording medium, and 201
Is a carriage for mounting the optical card 200. The carriage 201 is configured to be movable in the information track crossing direction by driving an ultrasonic motor (hereinafter abbreviated as USM) 202, and the information track is moved in the information track crossing direction with respect to the light beam by the control of the USM control circuit 207. By doing so, tracking is performed on a target information track, and tracking is prevented from deviating for a card having a skew angle. 202 is US
M is shown. Reference numeral 203 denotes an optical head in which a semiconductor laser serving as a light source and a photoelectric conversion element are integrated, and 204 denotes the optical head 2.
03, an objective lens that collects a light beam and irradiates it to the optical card 200; 205, a comparator that compares the information track crossing signal output from the optical head 203; and inputs it to the MPU 206. 206 controls each part of the device. MPU, 207 is a command from MPU 206 and USM20
2 is a USM control circuit for controlling the driving of the optical head 20, and 208 is the optical head 20 of the objective lens 204 output from the optical head 203.
3 is a lens position detection circuit that outputs the amount of deviation from the center position of 3 to the MPU 206. 209 is a USM control circuit 20
7 is a storage device that stores the voltage output to the printer 7 and the moving speed of the carriage 201.

Here, assuming that the light beam output from the optical head 203 is on a certain information track on the optical card 200, so-called seek control for moving this light beam to another information track is a target. If the information track of is outside the movable range of the objective lens 204 in the optical head 203, the MPU 206 informs the USM control circuit 207 of US
Issue a command to drive M202. USM control circuit 2
Reference numeral 07 outputs a drive voltage having a drive frequency and amplitude preset in the MPU 206 to the USM 202 to move the carriage 201 on which the optical card 200 is placed. As a result, the information track of the optical card 200 moves relative to the light beam output from the objective lens 204 in the information track crossing direction, and the optical head 203 passes through the comparator 205 each time the light beam crosses the information track. An information track crossing signal is output to the MPU 206. When the number of input pulses from the comparator 205 reaches the target value, the MPU 206 issues a command to the USM control circuit 207 this time to stop driving the USM 202. Therefore, the USM control circuit 207 stops the output of the drive voltage to stop the carriage 201, and the light beam can be moved to the target information track.

Next, the relative minute movement will be described. When the optical card 200 has the skew angle θ as shown in FIG. 12, the objective lens 204 moves the optical head 203 while the optical head 203 is scanning the information track in the auto-tracking state.
It is assumed that the robot moves from the center to the limit of the left or right movable range with respect to 3. At this time, since the current position of the objective lens 204 is input from the optical head 203 to the MPU 206 through the lens position detection circuit 208, it is determined from this signal that the movable range limit has been reached, and the MPU 206 uses the USM.
A drive voltage having a drive frequency and an amplitude that makes the moving speed of the carriage 201 slower than that at the time of preset seek control is applied to the control circuit 207.
02, and instructs to move the carriage 201 so that the objective lens 204 is located at the center of the optical head 203. When the information track of the optical card 200 starts moving, the objective lens 204 is in the auto-tracking state, and therefore starts moving in the same direction. Therefore, MPU
Since the position of the objective lens 204 is input to the 206 through the lens position detection circuit 208, the objective lens 20
When 4 moves to the center position of the optical head 203,
The M control circuit 207 is instructed to stop the driving voltage output to the USM 202.

FIG. 13 is a signal diagram showing the operation of the relative minute distance movement of the above-mentioned conventional example. In FIG. 13A, the objective lens is moved from the lens center position by m when the tracking control is on.
The figure shows the output signal of the lens position detection circuit 208 of the objective lens when the carriage is moved a minute distance in the direction perpendicular to the track when the carriage is moved to the (movable range limit) distance. In this case, since the AT control is in the ON state, the movement of the objective lens with respect to the optical head body becomes substantially equal to the movement of the carriage with respect to the optical head body. In FIG. 13A, the carriage starts moving in the direction perpendicular to the track from the time t ₁ by the ultrasonic motor.

FIG. 13B shows ON / OF of the ultrasonic motor.
It is an F signal and is on during the time from time t _{1 to} t ₅ . FIG. 13C shows the drive voltage of the ultrasonic motor. A constant voltage until time t ₁ ~t _3, in between time t ₃ ~t ₅ by making gradually decreasing the driving voltage, and stops while decelerating. Here, when the driving voltage of the ultrasonic motor is constant, the driving speed of the ultrasonic motor depends on the driving frequency,
That is, the speed of the carriage in the direction perpendicular to the track with respect to the optical head body (hereinafter referred to as the carriage speed) is determined. Further, in FIG. 13A, after the movement starts from time t ₁ , the carriage speed becomes substantially constant after delay time t ₂ , the deceleration starts at time t _{3 and} stops at time t ₅ . In this case, the moving distance of the objective lens with respect to the optical head is mn.

FIG. 13D shows the moving speed of the objective lens. FIG. 13E shows the light beam position (A) with respect to the track when the carriage is moved as described above.
t error). Since the At error increases in proportion to the acceleration of the carriage, it increases at the time of carriage drive start and deceleration as shown in FIG. In particular, when the driving voltage of the carriage is applied to the ultrasonic motor stepwise as shown in FIG. 13C, the time t ₁ to t ₂ for reaching the maximum speed is short, but the acceleration at the start of driving is large, As shown in FIG. 13E, the At error also becomes maximum at that time. In this case, the time to reach the maximum speed is determined by the time constant of the ultrasonic motor, so if the maximum speed is increased,
The acceleration at the start of driving increases and the At error also increases.

On the contrary, if the moving speed of the carriage is too low, the moving amount per unit time becomes small, so that the required moving amount cannot be obtained. Therefore, as a method for reducing the acceleration at the start of driving, there is a method as shown in FIG. That is, the driving voltage of the ultrasonic motor shown in FIG. 14 (c) between t ₁ ~t _3, by increasing in proportion to the time, is that to uniformly accelerated motion of the carriage. Therefore, in such a driving method, the acceleration at the time of acceleration becomes small, so that the At error at the time of acceleration can be made small as shown in FIG. FIG.
4 (a), (b) and FIG. 14 (d) show the signals of the respective parts when the ultrasonic motor is driven in this way, corresponding to FIG.

[0018]

However, in the prior art, since the carriage is decelerated at a constant deceleration as described with reference to FIG. 13, the objective lens has a certain size even at time t ₄ when the carriage is stopped. Has an acceleration of 0, and an At error proportional to the acceleration causes the time t
_Even after ₄ , the At error is vibrated. Therefore, if the carriage is moved a small distance immediately after the carriage deceleration is stopped, the At error at the time of acceleration is added with the vibration of the At error at the time of the previous stop, and the At error becomes even larger. Therefore, when the At error becomes larger than the permissible value, the light beam shifts with respect to the track.
There is a problem that recording / reproducing cannot be performed, and in the worst case, track loss occurs.

Further, in the prior art, since the drive voltage amplitude of the ultrasonic motor and the carriage speed at the time of deceleration have a relationship as shown in FIG. 15, as the drive voltage amplitude is lowered, the drive voltage becomes Vsp volts (>). It becomes stuck in 0). Therefore, in FIG. 13B, the ultrasonic motor ON / OFF signal is turned off at time t ₅ , but in actuality, FIG.
As is clear from (a), the ultrasonic motor stops at time t ₄ when the drive voltage amplitude before t ₅ becomes Vsp. Therefore, not only the control time of the carriage a small distance movement is long, the time t ₄ the ultrasonic motor does not move -
Since the deceleration time is shortened by the time of t ₅ , the deceleration is increased, and accordingly, the At error is increased.

Further, in the related art, as shown in FIG. 16, in the relationship between the drive voltage of the ultrasonic motor and the carriage speed, there is a dead zone in which the ultrasonic motor does not operate when the drive voltage amplitude is from 0 volt to V _t volt. Therefore,
As described in 4 (c), the drive voltage of the ultrasonic motor is set to 0.
Even if the voltage is increased from the voltage, the carriage does not operate until time t ₂ when the drive voltage becomes V _t . Therefore, time t
There was a problem that the maximum speed was reached between _{2 and} t ₃ and the acceleration became large. In addition, when driving the ultrasonic motor as shown in FIG. 14, it is taking longer between time t ₂ ~t _3, it is possible to reduce the acceleration time t ₁ ultrasonic motor does not operate ~t ₂ The control time becomes longer, and the carriage does not start even if the ultrasonic motor starts driving at time t ₁ when the objective lens reaches the movable range limit m, but the objective lens moves due to the skew angle. However, there is also a problem that the movable range limit is exceeded between times t ₁ and t ₂ .

In view of the above-mentioned conventional problems, the present invention provides an optical information recording / reproducing apparatus which suppresses an At error during deceleration of an ultrasonic motor and prevents a light beam from being detracked. The purpose is to

Further, according to the present invention, the responsiveness of the ultrasonic motor at the time of acceleration is improved, whereby the acceleration time is made longer and the acceleration is made smaller, thereby suppressing the At error at the time of acceleration. An object is to provide a reproducing device.

[0023]

SUMMARY OF THE INVENTION An object of the present invention is to condense a light beam on an information recording medium, first driving means for moving the condensing means in a tracking direction, and 1 drive means and an optical head section provided with the condensing means, and a second drive means composed of an oscillating wave drive means for relatively moving the optical head section and the recording medium in the cross-track direction. In the optical information recording / reproducing apparatus, when the second drive means is decelerated, the drive signal of the second drive means is reduced at a predetermined change rate and then exponentially reduced. This is achieved by a dynamic information recording / reproducing device.

An object of the present invention is to condense a light beam on an information recording medium, a first driving means for moving the condensing means in a tracking direction, the first driving means and the above-mentioned means. An optical information recording / reproducing apparatus having an optical head unit provided with a condensing unit, and a second drive unit composed of an oscillatory wave drive unit for relatively moving the optical head unit and the recording medium in the track crossing direction. In the above, the optical information recording / reproducing apparatus is characterized in that, at the time of deceleration of the second drive means, the rate of change of the drive signal is gradually reduced and supplied to the second drive means. .

An object of the present invention is to condense a light beam on an information recording medium, a first driving means for moving the condensing means in a tracking direction, a first driving means and the above-mentioned. An optical information recording / reproducing apparatus having an optical head unit provided with a condensing unit, and a second drive unit composed of an oscillatory wave drive unit for relatively moving the optical head unit and the recording medium in the track crossing direction. At the time of deceleration of the second drive means, the drive signal of the second drive means is reduced at a predetermined change rate, and the value of the drive signal when the second drive means stops deceleration is This is achieved by an optical information recording / reproducing apparatus characterized by setting the maximum value at which the second driving means stops or a value in the vicinity thereof.

An object of the present invention is to condense a light beam on an information recording medium, a first driving means for moving the condensing means in a tracking direction, the first driving means and the above-mentioned means. An optical information recording / reproducing apparatus having an optical head unit provided with a condensing unit, and a second drive unit composed of an oscillatory wave drive unit for relatively moving the optical head unit and the recording medium in the track crossing direction. In the above, the optical signal is characterized in that the initial value of the drive signal of the second drive means is set to a minimum value at which the second drive means starts to move or a value in the vicinity thereof when the second drive means is accelerated. This is achieved by an information recording / reproducing device.

[0027]

Embodiments of the present invention will now be described in detail with reference to the drawings. First, a configuration example of an optical system used in the optical information recording / reproducing apparatus of the present invention will be described with reference to FIG. In FIG. 3, a movable optical head 301 reciprocates in the X direction in the figure along a track formed in the longitudinal direction of the optical card 9c, and irradiates the optical beam from the fixed optical system 304 on the optical card 9c. To do. The movable optical head 301 includes an objective lens 12 for condensing a light beam.
9. A reflecting mirror 303 for reflecting the light beam from the fixed optical system 304 toward the objective lens 129 is provided. This objective lens 129 is attached to the main body of the movable optical head 301 via an AF moving coil (not shown) and an AT moving coil (not shown). The objective lens 129 is driven in the optical axis direction by driving the AF moving coil. And move the condensed light flux along the optical card 9
AT spots 310a and 310c and AF spot 310b are formed on c. Further, by driving the AT moving coil, the objective lens 129 is moved relative to the main body of the movable optical head 301 in a direction crossing the track of the optical card 9c.

The fixed optical system 304 is an optical system that emits a light beam for recording and reproducing information and detects reflected light, and is arranged separately from the movable optical head 301.
In the fixed optical system 304, the semiconductor laser 3 as a light emitting source is provided.
05, collimator lens 306, optical beam shaping prism 307, diffraction grating 308, beam splitter 302, optical system such as astigmatism condenser lens 309, etc., optical card from beam splitter 302 after passing through astigmatism condenser lens 309. The spots 310a, 310b reflected by 9c,
AT photodetectors 101a, 101 on which 310c is imaged
c, an AF photodetector 101b is provided.

FIG. 1 is a block diagram showing a control system including an AF control system, an AT control system, a lens position detection circuit, and a carriage drive circuit in the first embodiment of the optical information recording / reproducing apparatus of the present invention. In FIG. 1, the fixed optical system 304
The AF photodetector 101b provided in is a four-division detector that detects the AF spot that is the center light of the light beam emitted from the semiconductor laser 305 and reflected by the optical card 9c. , Outputs a and b obtained by adding the respective sensor outputs on the diagonal line are input to the differential amplifier 103. The AF error signal g output from the differential amplifier 103 is input to the phase compensator 104 and the comparator 118. In addition, the comparator 1
The signal obtained by comparing the AF error signal g at 18 is MP
Input to U120, the output of the phase compensator 104 is switched S
It is input to the W terminal of W105. The switching SW 105 selects the W terminal or the X terminal according to the switching signal from the MPU 120, and a constant voltage is input to the X terminal. Switching S
The signal selected in W105 is the AF coil driver 10
6 is configured to drive the AF coil 107 of the AF actuator.

The AT detectors 101a and 101c are detectors for detecting an AT spot which is side light in the light beam emitted from the semiconductor laser 305 and reflected by the optical card 9c. , D are input to the differential amplifier 108. The AT error signal h, which is the output of the differential amplifier 108, is input to the phase compensator 109, and the signal that has been compared via the comparator 117 is input to the MPU 120. Phase compensator 10
The output of 9 is input to the Y terminal of the switching SW 110.

On the other hand, the light from a light emitting diode (not shown) provided in the movable optical head 301 is reflected by a reflecting plate provided on the side surface of the lens barrel of the objective lens 129, and the pair of position sensors 1
02a and 102b. Position sensor 102
The output signals e and f of a and 102b are the lens position detection circuit 4
08 differential amplifier 112, and the differential amplifier 112
The lens position signal i, which is the output of, is input to one input end of the differential amplifier 113 and the A / D converter 116, and the output of this A / D converter 116 is input to the MPU 120. It should be noted that the lens position detection circuit 408 composed of the differential amplifier 112 and the A / D converter 116 and the MPU 120 constitute an objective lens movement speed detection circuit for detecting the movement speed of the objective lens 129.

The other input terminal of the differential amplifier 113 is connected to the MPU 120 via the D / A converter 119. The output of the differential amplifier 113 is the phase compensator 114.
Is input to the switch SW110.
Is input to the Z terminal of. Switch SW110 is MPU1
The tracking servo status (Y
Either the terminal side) or the lens position servo state (Z terminal side) is selected. The output of the switch SW110 is A
The power is amplified by the T coil driver 111, and the output thereof drives the AT coil 115 of the AT actuator to move the objective lens 129 in the direction perpendicular to the track.

Reference numeral 406 denotes a carriage drive circuit which is a drive circuit for the ultrasonic motor 128, and signals of respective parts of the drive circuit 406 are shown in FIG. D / A converter 12
The input of 1 is connected to MPU120, and MPU12
It receives a digital value from 0 and outputs an analog voltage.
The output of the D / A converter 121 is a voltage frequency converter (V
The CO / 122 is converted into the drive frequency signal fd of FIG. 3 by the voltage / frequency conversion, and is output to the pulse width setting circuit 123. The pulse width setting circuit 123 creates a signal fw adjusted to an arbitrary pulse width from the pulse width data input from the MPU 120 and the clock input from the clock circuit 124, and outputs it to the ring counter 125. In the ring counter 125, the signal fw is changed to C, as shown in FIG.
It is divided into four phases D, E, F, and each phase output A, Ax, B,
It is output to the switch SW 126 as Bx. Switch SW126
An ON / OFF signal L and a forward / reverse signal k are input from the MPU 120.

The ON / OFF signal L is the ultrasonic motor 128.
The forward / backward signal k is a signal for instructing the direction of the traveling wave formed on the vibrator for switching the driving direction of the carriage. The switch SW 126 receives these signals and selects the phase output A, Ax, B, Bx signals so as to drive the ultrasonic motor 128 in the commanded drive direction, and outputs C, D, E, F as drive phase outputs. The signal is input to the drive circuit 127. The drive circuit 127 amplifies the electric power so that the ultrasonic motor 128 can be driven, and outputs the drive signals G and H as shown in FIG. 2 to the ultrasonic motor 128. Here, the drive voltage amplitudes of the ultrasonic motor drive signals G and H are changed in accordance with the pulse width set by the pulse width setting circuit 123, and the carriage moved by the ultrasonic motor 128 is moved accordingly. The speed changes. For example, when the pulse width is gradually decreased, the drive voltage amplitude correspondingly decreases, and the carriage speed gradually decreases.

FIG. 4 is a diagram showing the overall construction of an optical information recording / reproducing apparatus including the control system of FIG. 1 and the optical head system of FIG. The outline will be described with reference to this figure. First, when the optical card is inserted into the device, it is detected by a sensor (not shown), and the MPU 120 drives the loading motor 402 via the motor drive circuit 401. As a result, the optical card 9c is introduced into the apparatus and mounted on the carriage 403. Next, the semiconductor laser 305 is driven by the laser drive circuit 404 that receives a command from the MPU 120, and the light flux thereof enters the movable optical head 301, and the objective lens 12
At 9, the light is focused on the optical card 9c on the carriage 403.
In this case, the AT / AF control circuit 405 uses the MPU 120
Command to move the AF coil 10 on the movable optical head 301.
7 is controlled to perform AF pull-in and auto-focusing so that the light beam is focused on the recording / reproducing surface of the optical card 9c.

Details of the AF pull-in will be described with reference to FIG. When pulling in the AF, the photodetector 101b detects the AF spot which is the center light of the light beam reflected by the optical card 9c, and the comparator 118 outputs the AF error signal g which is the difference signal between the sensor outputs a and b. Via the MPU 120 for monitoring. At the start of the AF pull-in, the MPU 120 gives a changeover signal to the changeover SW 105 to switch to the X terminal side to enter the AF pull-in mode, and a constant current is supplied to the AF coil 107 to move the objective lens 129 in the direction perpendicular to the medium surface. . Then, the MPU 120 detects the output of the comparator 118, and the comparator 118 outputs the signal at the AF focusing point. Therefore, the MPU 120 switches the switch SW10 at this timing.
A switching signal is sent to 5 to switch to the W terminal side to enter the AF servo mode. With this, the auto-focusing state is set. The above AF pull-in is performed when the light spot is on the track.

Next, in the AT / AF control circuit 405, MP
In response to a command from U120, the AT coil 115 on the movable optical head 301 is controlled to perform AT pull-in and automatic tracking so as to track the track on the optical card 9c. Details of the AT pull-in will be described with reference to FIG. At the start of AT pull-in, switch SW11 from MPU120
A switching signal is applied to 0 to switch to the Z terminal side, and the AT pull-in mode is set. In this state, the lens position signal i which is the output of the differential amplifier 112 and the signal obtained by differentially amplifying the output of the D / A converter 119 commanded by the MPU 120 by the differential amplifier 113 are used as the phase compensator 114 and the AT coil driver. By forming a lens position servo via the 111 and AT coils 115 and gradually changing the output of the D / A converter 119, the objective lens 129 is moved in a direction perpendicular to the track on the optical card 9c (crossing the track). Move slowly). On the other hand, the AT error signal h, which is the output of the differential amplifier 108, is monitored by the MPU 120 via the comparator 117, and when ON tracking is performed, the MPU 120 sends a switching signal to the switching SW 110 to switch to the Y terminal side to switch to the AT servo mode. To As a result, the automatic tracking (AT) state is set.

On the other hand, recording and reproducing of information is performed as follows. First, the magnet 409 and the voice coil 4
MP to the voice coil motor of the magnetic circuit composed of 10 and
The output of the head drive circuit 411 that receives a command from U120 is input, and the movable optical head 301 is scanned, that is, the light beam is scanned. When recording is performed during scanning, a modulation signal is sent from the laser driving circuit 404 to the semiconductor laser 305.
To the optical card 9c with a high-power optical beam, and in the case of reading, the output signal of the AF photodetector 101b is input to the reproduction circuit 412 to reproduce the information written on the optical card 9c. And outputs it to the MPU 120. During scanning of the movable optical head 301, the objective lens 129
In order to maintain the position within a predetermined range with respect to the movable optical head 301, when the output of the lens position detection circuit 408 exceeds the predetermined range, the ultrasonic motor 128 is driven to move the carriage 403 in the track crossing direction. The objective lens 129 is slightly moved to return to the lens center position.

Next, the relative minute distance moving operation in the first embodiment of the present invention will be described with reference to FIG. FIG. 5 (a)
Is the objective lens 129 when the tracking control is on.
6 shows an output signal of the position detection circuit 408 when the carriage 403 is moved by a minute distance in the direction perpendicular to the track when the lens has moved from the lens center position n to the position m (movable range limit). Here, since the AT control is in the ON state, the movement of the objective lens 129 with respect to the optical head main body (movable optical head) is almost equal to the movement of the carriage with respect to the optical head main body.

FIG. 5B shows that the ultrasonic motor 128 is turned on / off.
This is an OFF signal, and when it is ON, a drive voltage is applied to the ultrasonic motor 128 to drive the ultrasonic motor 128. 5C shows the drive voltage amplitude of the ultrasonic motor 128, and FIG. 5D shows the moving speed of the objective lens 129. The moving speed of the objective lens 129 is almost equal to the speed of the carriage 403 as in FIG. FIG. 5E shows the light beam position (At error) with respect to the track when the carriage 403 moves.

Here, in FIG. 5A, when the objective lens 129 moves in the track crossing direction due to a skew or the like and moves from the lens center position n to the distance m of the movable range limit, the objective is detected by the lens position detection circuit 408. It is detected that the lens 129 has reached the movable range limit,
The MPU 120 is notified. When the MPU 120 recognizes that the objective lens 129 has reached the movable range limit m, the ultrasonic motor 128 is turned on as shown in FIG. 5B.
The / OFF signal is turned on, and at the same time, the drive frequency data is output to the D / A converter 121 so that the speed required for the minute distance movement can be obtained. At the same time, the MPU120
Then, as shown in FIG. 5C, the pulse width setting circuit 123 keeps the constant drive voltage amplitude V between times t ₁ and t _3.
Output pulse width data to. In this way ultrasonic motor 1
28 is driven, the carriage 403 starts moving in the direction opposite to the moving direction of the light beam up to now, and the objective lens 129 moves toward the lens center position along with this movement.

Next, in the MPU 120, at time t ₃ , as shown in FIG. 5C, the ultrasonic motor 1 until time t _{4 is} reached.
The pulse width data to the pulse width setting circuit 123 is gradually decreased so that the change rate of the drive voltage amplitude of 28 becomes constant at −a (voltage / time). Then, at time t ₄ , pulse width data is supplied to the pulse width setting circuit 123 so that the drive voltage amplitude of the ultrasonic motor 128 exponentially decreases by time t _{6 as} shown in FIG. 5C. Is output. For example, in the MPU 120, the drive voltage amplitude V of the ultrasonic motor 128 is

[0043]

[Equation 1] The pulse width data is output so that V ₂ is time t
The drive voltage amplitude value at ₄ , t is time, and τ is a time constant. However, as described above, since the ultrasonic motor 128 has a dead zone with respect to the drive voltage amplitude, the carriage 403 stops at the dead zone at time t ₅ , at which point the objective lens 129 moves to the position shown in FIG. To the lens center position n. After that, in the MPU 120, the ON / OFF signal of the ultrasonic motor 128 is turned off as shown in FIG. 5B to end the minute movement operation of the carriage 403.

When the drive voltage amplitude of the ultrasonic motor 128 is changed in this way, the moving speed of the carriage 403 is almost proportional to the drive voltage amplitude of the ultrasonic motor 128,
The moving speed of the carriage 403, that is, the movable optical head 3
The moving speed of the objective lens 129 with respect to 01 is shown in FIG.
It changes like. Therefore, the At error is caused by the objective lens 1.
Is proportional to 29 of the acceleration (deceleration), as shown in FIG. 5 (e), first, during the time t ₁ ~t ₂ becomes larger, the objective lens 129 in between times t ₂ ~t ₃ is constant speed Since it is moving at, the At error does not occur. Also, at time t
_{Between 3 and} t _4, the rate of change of the drive voltage amplitude of the ultrasonic motor 128 is kept constant, and the objective lens 129 decelerates at a constant deceleration, so that a certain amount of At error occurs as shown in FIG. Occurs.

Further, between the times t _{4 and} t ₅ , the drive voltage amplitude of the ultrasonic motor 128 decreases exponentially, and the deceleration of the objective lens 129 also decreases exponentially in proportion thereto. the deceleration immediately after time t ₄ is the time t ₃ ~t temporarily becomes larger than the deceleration during _4, FIG. 5 (e)
As such, the At error also temporarily increases by that amount. However, since the deceleration of the objective lens 129 at the time t ₅ when the carriage 403 stops is much smaller than the deceleration between the times t _{3 and} t ₄ , the At error at that time is small as shown in FIG. Therefore, the vibration amplitude of the At error that occurs after the carriage 403 is stopped is significantly smaller than that of the conventional one.

Thus, in this embodiment, the carriage 40
3 is stopped, the drive voltage amplitude of the ultrasonic motor 128 is reduced at a constant change rate, and then the drive voltage amplitude is exponentially reduced.
The deceleration of the objective lens 129 at the time of the stop of 3 can be reduced,
Thereby, the vibration of the At error after the carriage 403 is stopped can be suppressed. Therefore, the carriage 40
If the minute movement operation of the carriage 403 is performed immediately after the stop of No. 3, the At error at the previous stop is small even if the At error during acceleration is added to the vibration amount of the At error when the carriage 403 is stopped. , At error can be prevented from becoming extremely large. Therefore,
It is possible to prevent the situation where the light beam deviates from the track and recording / reproducing cannot be performed, or the track deviates, and the operation of the device can be stabilized.

In the above embodiment, the drive voltage amplitude value applied to the ultrasonic motor during carriage deceleration is changed at a predetermined change rate, and after a predetermined time elapses, the drive voltage amplitude value is changed exponentially. However, the present invention is not limited to this, and the drive voltage amplitude value may be exponentially changed from the time when the predetermined position is reached based on the position data obtained from the lens position detection circuit 408. Alternatively, the drive voltage amplitude value may be exponentially changed after the speed value obtained by differentiating the position data of the lens position detection circuit 408 reaches a predetermined value.

Next, a second embodiment of the present invention will be described. In this embodiment, when the ultrasonic motor 128 is decelerated, the rate of change of the drive voltage amplitude is changed in two steps to perform deceleration. FIG. 6 is a time chart showing signals of various parts of this embodiment. FIG. 6A shows an output signal of the lens position detection circuit 408 when the carriage 403 is moved by a minute distance when the objective lens 129 moves to the movable range limit. In FIG. 6A, n is the center position of the objective lens 129, and m is the position of the movable range limit. When the lens position detection circuit 408 detects that the objective lens 129 has moved to the movable range limit m, the MPU 120 turns ON the switching SW 126 at time t ₁ when the movable range limit m is reached as shown in FIG. 6B. The / OFF signal is turned on, and at the same time, the driving frequency data is output to the D / A converter 121 so that the speed required for the minute distance movement can be obtained. In this case, as shown in FIG. 6C, predetermined pulse width data is output to the pulse width setting circuit 123 so that the constant drive voltage amplitude V is obtained from time t ₁ to t ₃ . In this way, the ultrasonic motor 128 is driven, the carriage 403 starts moving in the direction opposite to the moving direction of the light beam so far, and along with this, the objective lens 129 moves to the lens center position as shown in FIG. 6A. Move towards.

After a predetermined time has passed from time t ₁ , time t
_{At 3} , when the MPU 120 changes the drive voltage amplitude of the ultrasonic motor 128 by time t _{4 as} shown in FIG.
pulse width setting circuit 12 so that it changes with a (V / time)
Decrease pulse width data to 3. Then, time t ₄
Then, the MPU 120 causes the pulse width setting circuit 1 to change the drive voltage amplitude of the ultrasonic motor 128 by the change rate −b (V / hour) smaller than the change rate −a by the time t _6.
Decrease the pulse width data to 23. Ultrasonic motor 1
28 is thus driven with a drive voltage amplitude that changes at two different rates, and the carriage 403 decelerates according to the drive voltage amplitude. However, ultrasonic motor 1
28 has a dead zone, the carriage 403 is shown in FIG.
It stops at time t _{5 when} it becomes a dead zone as shown in FIG. 6A, at which point the objective lens 129 returns to the lens center position as shown in FIG. 6A. Then, at time t ₆ , the MPU 120
Is ON / OFF to the switching SW 126 as shown in FIG.
The signal is turned off, and the minute movement operation of the carriage 403 is completed.

FIG. 6D shows the ultrasonic motor 1 as described above.
The moving speed of the carriage 403 when driving 28, that is, the moving speed of the objective lens 129 with respect to the optical head is shown. Since the moving speed of the carriage 403 is almost proportional to the drive voltage amplitude of the ultrasonic motor 128, the moving speed of the carriage 403 changes as shown in FIG. Figure 6
(E) shows an At error. Here, since the At error is proportional to the acceleration of the objective lens 129 between the times t ₁ and t ₂ , the At error becomes large as shown in FIG. 6 (e), and the At error increases between the times t _{2 and} t _3. Since the lens 129 is moving at a constant speed, the At error does not occur.

[0051] Further, between the time t ₃ ~t _4, since the objective lens 129 is decelerated at a constant deceleration, At error occurs accordingly as in FIG. 6 (e), the time t ₄ ~t
Since deceleration between ₅ is smaller than the deceleration between time t ₃ ~t _4, At the error is further reduced in between times t ₄ ~t _5. Therefore, at time t ₅ when the carriage 403 stops, the At error becomes significantly smaller than that in the conventional case as shown in FIG. 6E, and the amplitude of the At error that occurs after the carriage 403 stops also becomes significantly smaller. As described above, in this embodiment, the rate of change of the drive voltage amplitude of the ultrasonic motor 128 is changed in two steps. Therefore, the deceleration of the objective lens 129 when the carriage 403 is stopped is exactly the same as in the first embodiment. Therefore, the vibration of the At error that occurs after the carriage 403 is stopped can be suppressed.

In the above embodiment, the ultrasonic motor 1
The rate of change of the drive voltage amplitude of 28 was changed in two steps.
The present invention may change the change rate of the drive voltage amplitude in more steps. Of course, in this case, the rate of change of the drive voltage amplitude may be gradually reduced. Further, in the embodiment, the drive voltage amplitude of the ultrasonic motor 128 is controlled by a predetermined time, but the lens position detection circuit 40
The control may be performed based on the position signal obtained in step 8, or may be performed based on the speed signal obtained by differentiating the position signal.

Next, a third embodiment of the present invention will be described. This embodiment is an example in which the final value of the drive voltage amplitude of the ultrasonic motor 128 when the carriage 403 decelerates and stops is controlled to be the maximum voltage Vsp at which the ultrasonic motor 128 stops. Vsp is a voltage at which the ultrasonic motor 128 stops operating when the drive voltage amplitude of the ultrasonic motor 128 is reduced as described with reference to FIG. FIG. 7 is a diagram showing signals of the respective parts of the present embodiment, and times t _{1 to} t ₅ correspond to times t _{1 to} t ₅ of FIG. 13, respectively. Further, in FIG. 7, signals are shown for two control patterns A and B. First, the control pattern A will be described. FIG. 7A shows an output signal of the lens position detection circuit 408 when the carriage 403 is moved by a minute distance when the objective lens 129 moves to the movable range limit. n is the lens center position of the objective lens 129, and m is the movable range limit position.

When it is detected that the objective lens 129 has reached the movable range limit m, the MPU 120 turns on the ON / OFF signal of the ultrasonic motor 128 at time t _{1 as} shown in FIG. The drive frequency data is output to the D / A converter 121 so that the speed required for a minute distance movement can be obtained as in 7 (c). In this case, from time t ₁ to t
Up to ₃ , pulse width data is output to the pulse width setting circuit 123 so as to have a constant drive voltage amplitude V as shown in FIG. 7C. In this way, the ultrasonic motor 128 is driven, and the carriage 403 starts moving in a direction opposite to the moving direction of the light beam up to now, and along with this, the objective lens 129.
Moves toward the lens center position as shown in FIG.

Next, at time t ₃ , in the MPU 120, the drive voltage amplitude of the ultrasonic motor 128 decreases at a constant rate of change from time t ₃ to time t ₄ as shown in FIG. 7C.
At time t ₄ , pulse width data is output to the pulse width setting circuit 123 so that the drive voltage amplitude becomes the voltage Vsp that is in the dead zone of the ultrasonic motor 128. Then, at time t ₄ , when the drive voltage amplitude reaches Vsp, the drive voltage is set to 0 as shown in FIG. 7C, and at the same time, the ON / OFF signal of the ultrasonic motor 128 is turned off as shown in FIG. 7B. Then, the driving of the ultrasonic motor 128 is stopped.

Explaining the control pattern B, the MPU 120 reduces the drive voltage amplitude from time t ₃ to t ₅ at a constant rate of change, and causes the pulse width setting circuit 123 to set the pulse width to Vsp at time t _5. Output the data. Then, at time t _{5 when} the drive voltage amplitude becomes Vsp, the drive voltage is set to 0 as shown in FIG. 7C, and at the same time, the ultrasonic motor 128 is turned ON / OFF as shown in FIG. 7B.
The F signal is turned off to stop driving the ultrasonic motor 128.

As described above, in this embodiment, the ultrasonic motor 1
By controlling the final value of the drive voltage amplitude value of No. 28 to be the voltage Vsp that becomes the dead zone of the ultrasonic motor 128, the deceleration can be made small even with the same deceleration time, and the At error can be suppressed to a small level. can do. In particular, if the deceleration time is set to be long as in the control pattern B, the deceleration can be further reduced, so that the At error can be made smaller than that in the control pattern A as shown in FIG. Therefore, the carriage 403 stops at the time t ₄ or t ₅ at which the control of both the control patterns A and B ends, so that the next control operation can be immediately started. In the present embodiment, the drive voltage amplitude when the ultrasonic motor 128 is stopped is set to the value Vsp at which the ultrasonic motor 128 first stops as described with reference to FIG. 15, but it may be a value near Vsp.

Next, a fourth embodiment of the present invention will be described. This embodiment is an example in which the initial value of the drive voltage amplitude at the time of starting the ultrasonic motor 128 is set to the minimum voltage at which the ultrasonic motor 128 starts moving to improve the response during acceleration. FIG. 8 is a diagram showing signals of the respective parts of this embodiment. FIG. 8A shows an output signal of the lens position detection circuit 408 when the carriage 403 is moved a minute distance when the objective lens 129 moves to the movable range limit. n is the lens center position of the objective lens 129, and m is the movable range limit position. When the objective lens 129 moves to the movable range limit m as shown in FIG. 8A, the MPU 120 makes the O of the ultrasonic motor 128 O at time t ₁ as shown in FIG. 8B.
The N / OFF signal is turned on, and at the same time, the driving frequency data is output to the pulse width setting circuit 123.

At this time, the MPU 120 is shown in FIG.
16 so that the initial value of the drive voltage amplitude of the ultrasonic motor 128 at time t ₁ becomes V _t , that is, FIG.
As described above, the voltage V _t at which the ultrasonic motor 128 starts to move at the set driving frequency is set. Then
As in the MPU120 FIG 8 (c), t from time t _1
The pulse width data is output to the pulse width setting circuit 123 so that the driving voltage amplitude increases up to ₂ at a constant rate. Therefore, the initial value of the drive voltage amplitude of the ultrasonic motor 128 is V _t.
Therefore, as shown in FIG. 8D, the carriage 403 starts to move quickly at time t ₁ and moves at almost constant acceleration until time t ₂ . From time t ₂ to t ₃ , the MPU 120 outputs pulse width data to the pulse width setting circuit 123 so that the drive voltage amplitude of the ultrasonic motor 128 becomes constant as shown in FIG.
Move 3 at a constant speed. During this time, the objective lens 129 catches up with the carriage 403 and is not displaced from the track, so that the At error becomes 0 as shown in FIG.

At time t ₃ , the MPU 120 operates as shown in FIG.
As shown in (c), the pulse width setting circuit 12 is set so that the drive voltage amplitude of the ultrasonic motor 128 gradually decreases until time t _5.
The pulse width data is output to 3 and the carriage 403 is decelerated. At the time of this deceleration, the ultrasonic motor 128 does not move at a predetermined voltage as described above, so that the carriage 403 stops at time t ₄ before the drive voltage amplitude becomes 0 as shown in FIG. 8D. . The MPU 120 is shown in FIG.
ON at time t ₅ when the drive voltage amplitude becomes 0 as in (b)
The / OFF signal is turned off and the operation of moving the carriage 403 by a minute distance is completed.

In this embodiment, since the initial value of the drive voltage amplitude of the ultrasonic motor 128 is set to the minimum voltage at which the ultrasonic motor 128 starts moving, the carriage 403 starts to move quickly at the start of driving, which is the same as in the conventional case. Ultrasonic motor 128
The delay at the time of starting can be eliminated. Therefore, the dead time due to the dead zone of the ultrasonic motor 128 is eliminated, so that the acceleration time can be lengthened accordingly and the acceleration of the carriage 403 can be suppressed to a small value. Therefore, the At error is proportional to the acceleration.
As shown in (e), the At error from the time t ₁ to t ₂ at the time of acceleration of the ultrasonic motor 128 can be made significantly smaller than in the conventional case, and as a result, the track deviation of the light beam can be prevented and the track deviation occurs. Such a situation can be prevented in advance. In addition, in the fourth embodiment,
The initial value of the drive voltage of the ultrasonic motor 128 is set to the minimum voltage V _{t at} which the ultrasonic motor 128 starts to move, but if the delay of control and the At error at the time of starting are within the allowable range, then the value is close to V _t . It may be a value.

In the above embodiments, the control of the ultrasonic motor when the carriage is moved by a minute distance has been described as an example. However, the present invention is not limited to this, and the tracking control is turned off to obtain the light beam. It goes without saying that the present invention can also be applied to the control of the ultrasonic motor at the time of seek for moving to another track. Further, in the embodiment, an example in which the carriage for mounting the optical card on the optical head part is moved in the direction orthogonal to the track by driving the ultrasonic motor has been shown. Fixed,
The method of moving the optical head unit in the direction orthogonal to the track can also be applied to the control of moving the optical head unit by the ultrasonic motor. Further, in the embodiment, the example in which the drive voltage amplitude of the ultrasonic motor is changed by changing the pulse width of the drive frequency signal is shown, but the drive frequency signal is not a pulse signal but a sine wave signal and its amplitude is changed. The drive voltage amplitude may be changed accordingly.

[0063]

As described above, the present invention has the following effects. (1) By reducing the drive signal exponentially during deceleration of the ultrasonic motor, vibration of At error when the carriage or the optical head is stopped or At error after the stop can be significantly reduced as compared with the conventional case. it can. Therefore, since the light beam does not shift with respect to the track, it is possible to prevent a situation in which recording / reproducing cannot be performed or a track is lost. (2) By reducing and supplying the change rate of the drive signal stepwise at the time of decelerating the ultrasonic motor, vibration of At error when the carriage or the optical head is stopped or At error after the stop can be reduced. It is possible to prevent a situation such as a truck coming off. (3) By setting the final value of the drive voltage amplitude of the ultrasonic motor to the maximum value at which the ultrasonic motor stops or a value in the vicinity thereof, the deceleration can be reduced even during the same deceleration time. At error in can be suppressed. (4) By setting the initial value of the drive signal at the time of acceleration of the ultrasonic motor to the minimum value at which the ultrasonic motor starts moving or a value in the vicinity thereof, the response at the time of acceleration can be improved, and the acceleration time is lengthened accordingly. Can be taken. Therefore, since the acceleration can be suppressed to be small by the length of the acceleration time, it is possible to suppress the At error to be small, and as a result, it is possible to prevent a situation such as a track deviation.

[Brief description of drawings]

FIG. 1 is a diagram showing a main part configuration of a first embodiment of an optical information recording / reproducing apparatus according to the present invention.

FIG. 2 is a signal diagram for explaining the operation of the carriage drive circuit of the embodiment of FIG.

FIG. 3 is a diagram showing a specific example of an optical system used in the optical information recording / reproducing apparatus of the present invention.

FIG. 4 is a diagram showing the overall configuration of an optical information recording / reproducing apparatus according to the present invention.

FIG. 5 is a signal waveform diagram showing the operation of the first embodiment of the optical information recording / reproducing apparatus of the present invention.

FIG. 6 is a signal waveform diagram showing the operation of the second embodiment of the present invention.

FIG. 7 is a signal waveform diagram showing the operation of the third embodiment of the present invention.

FIG. 8 is a signal waveform diagram showing the operation of the fourth embodiment of the present invention.

FIG. 9 is a diagram showing a recording surface of an optical card.

10 is an enlarged view showing a part of the optical card of FIG. 9. FIG.

FIG. 11 is a diagram showing a schematic configuration of a conventional optical card information recording / reproducing apparatus.

FIG. 12 is a diagram for explaining skew of an optical card.

13 is a signal waveform diagram for explaining a relative minute distance moving operation of the carriage of the conventional apparatus of FIG.

FIG. 14 is a signal waveform diagram for explaining a relative minute distance movement operation of another conventional carriage.

FIG. 15 is a diagram showing a change in carriage speed when the drive voltage amplitude of the ultrasonic motor is decreased.

FIG. 16 is a diagram showing a change in carriage speed when the drive voltage amplitude of the ultrasonic motor is increased from zero.

[Explanation of symbols]

 9c Optical card 107 AF coil 115 AT coil 120 MPU 121 D / A converter 122 VCO 123 Pulse width setting circuit 125 Ring counter 126 Switching SW 127 Drive circuit 128 Ultrasonic motor 129 Objective lens 301 Movable optical head 304 Fixed head 403 Carriage 405 AT / AF control circuit 406 Carriage drive circuit 408 Lens position detection circuit

Claims (11)

[Claims] 1. A light collecting means for collecting a light beam on an information recording medium, a first driving means for moving the light collecting means in a tracking direction, and a first driving means and the light collecting means. An optical information recording / reproducing apparatus comprising: an optical head unit provided; and a second drive unit that is a vibration wave drive unit that relatively moves the optical head unit and the recording medium in a track crossing direction. 2. An optical information recording / reproducing apparatus, characterized in that, when the second driving means is decelerated, the driving signal of the second driving means is reduced at a predetermined change rate and then exponentially reduced. 2. The optical information recording / reproducing apparatus according to claim 1, wherein the drive signal is exponentially decreased after a predetermined time has elapsed from the start of deceleration of the second drive means. Information recording / reproducing apparatus. 3. The optical information recording / reproducing apparatus according to claim 1, further comprising position detecting means for detecting a relative position of the recording medium and the optical head portion in a tracking direction,
After the deceleration of the second drive means is started, when the detected value of the position detection means reaches a predetermined value, the drive signal of the second drive means is exponentially decreased. Information recording / reproducing apparatus. 4. The optical information recording / reproducing apparatus according to claim 1, further comprising a speed detecting unit for detecting a relative moving speed of the recording medium and the optical head unit, and decelerating the second driving unit. After the start, when the detected value of the speed detecting means reaches a predetermined value, the drive signal of the second driving means is exponentially decreased, and the optical information recording / reproducing apparatus. 5. A light collecting means for collecting a light beam on an information recording medium, a first driving means for moving the light collecting means in a tracking direction, a first driving means and the light collecting means. An optical information recording / reproducing apparatus comprising: an optical head unit provided; and a second drive unit that is a vibration wave drive unit that relatively moves the optical head unit and the recording medium in a track crossing direction. An optical information recording / reproducing apparatus, characterized in that, when the second driving means is decelerated, the rate of change of the driving signal is gradually reduced and supplied to the second driving means. 6. The optical information recording / reproducing apparatus according to claim 5, wherein the rate of change of the drive signal of the second drive means is changed based on a predetermined time. Information recording / reproducing apparatus. 7. The optical information recording / reproducing apparatus according to claim 5, further comprising position detecting means for detecting a relative position of the recording medium and the optical head portion in a tracking direction,
An optical information recording / reproducing apparatus, characterized in that a rate of change of a drive signal of the second drive means is changed based on a detection value of the position detection means. 8. The optical information recording / reproducing apparatus according to claim 5, further comprising a speed detecting unit for detecting a relative speed of the recording medium and the optical head unit, and a drive signal of the second driving unit. The optical information recording / reproducing apparatus is characterized in that the rate of change is changed based on the detection value of the speed detecting means. 9. A light collecting means for collecting a light beam on an information recording medium, a first driving means for moving the light collecting means in a tracking direction, a first driving means and the light collecting means. An optical information recording / reproducing apparatus comprising: an optical head unit provided; and a second drive unit that is a vibration wave drive unit that relatively moves the optical head unit and the recording medium in a track crossing direction. When the second drive means is decelerated, the drive signal of the second drive means is reduced at a predetermined change rate, and the value of the drive signal when the second drive means stops deceleration is set to the second drive means. The optical information recording / reproducing apparatus is characterized in that it is set to a maximum value at which is stopped or a value in the vicinity thereof. 10. A light collecting means for collecting a light beam on an information recording medium, a first driving means for moving the light collecting means in a tracking direction, a first driving means and the light collecting means. An optical information recording / reproducing apparatus comprising: an optical head unit provided; and a second drive unit that is a vibration wave drive unit that relatively moves the optical head unit and the recording medium in a track crossing direction. When accelerating the driving means of 2,
An optical information recording / reproducing apparatus, wherein an initial value of a drive signal of the second drive means is set to a minimum value at which the second drive means starts moving or a value in the vicinity thereof. 11. The optical information recording / reproducing apparatus according to claim 1, wherein the pulse width of the pulse signal is changed according to the pulse width data. A control circuit having a width setting circuit and a step-up transformer that steps up the output signal of the pulse width setting circuit to convert it into a sine wave signal, and by changing the pulse width of the pulse signal of the pulse width setting circuit,
An optical information recording / reproducing apparatus characterized by controlling the second driving means.