JP2600880B2 - Accessing optical recording tracks - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

TECHNICAL FIELD The present invention relates to a track access method in an optical recording device.
Law, especially the number of tracks traversed by the beam spot
Beam spots on multiple tracks while checking accurately
Relates to novel technology that crosses quickly. BACKGROUND ART An optical recording disk system is an example of a conventional optical recording device.
Then, it is described here. In optical recording disk systems
Is the recording on the disk 1 which is the recording medium as shown in FIG. 1A.
The track has a beam spot focused on it
Is written, and the data is reflected from it.
Read by light. The system used there is
It is configured as follows: The optical recording disk 1 is a motor
It is driven by 1a and rotates on its axis. Not shown, driven by the carriage control unit 5.
The optical head 2 is driven by a
Move roughly in the radial direction. The optical head 2 serves as a light source
The light emitted from the semiconductor laser 24 is polarized by the lens 25
The light is guided to the objective lens 20 via the splitter 23;
Converged on the beam spot BS by the objective lens 20
Project onto optical disk 1; reflect from optical disk 1
The reflected light passes through the objective lens 20 to the polarization beam splitter 23.
Is input to the four-divided light receiver 26. Therefore, the light head
C2 can be referred to as carriage 2. In such an optical recording disc, the track is
A few micrometers, for example 1.6 μm
Many pitches are formed; therefore, peaks
Even a slight eccentricity such as 199μm
For a truck, it can cause a big track deviation,
Also, the undulation of the optical disc 1 is out of focus of the beam spot.
Cause the beam spot to be in these positions.
In order to follow a placed or undulating track,
It is necessary to be. For this reason, the objective lens 20 is moved on the optical head 2 by the lens.
For moving the focal point by moving it in the axial direction of the
The scum actuator (focus coil) 22 and the objective lens
Move the lens 20 (that is, in the horizontal direction in the figure) to
To change the position of the beam spot in the angular (or radial) direction
Track actuator (tracking coil) 21
Is provided. In response to this, focus from the optical signal from the light receiver 26
Generates an error signal FES and activates the focus actuator 22.
A focus servo controller 4 for driving, and a light receiver 26
Generates the tracking error signal TES from the optical signal
Micro truck for driving the track actuator 21
A locking servo controller 3 is also provided. The principles of micro-tracking servo control are shown in Figs. 1B and 1C.
A coaxial or screw provided in advance in the optical disc 1 as shown in FIG.
Beam spot caused by spiral guide groove (track) 10
Utilize the diffraction of BS. That is, the light entering the light receiver 26
The distribution value of the emitted light is
Using the fact that it changes depending on the relative position,
To obtain the position error of the beam spot from
You. For example, as is well known, FIGS.
As shown in FIG. 1F, four photodiodes 26a, 26b, 26c and
Push-pull method with a quadrant photodetector composed of helium and 26d
Is used, the distribution of the reflected light at the light receiver 26 is
The position of the beam spot is on the left side of the track 10 as shown in 1C
P shifted to ₁ In the case of, the distribution is as shown in Fig.
No; the position of the beam spot is off the track 10.
If there is no P (ie on the track), the distribution is shown in Figure 1E
And the position of the beam spot is track
In the case of P2 which is shifted from 10 to the right side of the figure, the distribution is
It is as shown in Fig. 1F. Therefore, the photodiodes 26a-2
From the 6d outputs a to d, the minute tracking servo control unit 3
The obtained {(a + b)-(cd)} is the track shown in FIG. 1G.
Forms the king error signal TES, which
Drive the actuator 21 to move the objective lens 20 in the horizontal direction.
Drive. In this way, eccentricity and blurring of the optical disc 1
The beam spot tracks track 10
come. Beam spots traverse multiple tracks at specific
Access the rack (hereafter referred to as truck jumping)
However, basically two types of methods have been adopted. So
In the first method, the lens 20 or a gas not shown is used.
Move the optical head (carriage) 2 with the Lubano mirror
The beam spot to a long distance of 120 mm
Move the rack at right angles. The second method is to track
If the number of jumps is less than 100, for example,
Lens 20 or mirror (to be replaced in the future)
By moving the lens
Small truck provided for tracking the truck
Fix the carriage or use the lens
The servo control unit (details of which will be described later)
The beam spot while tracking
It is to be moved in a right angle direction. These two methods
Usually used in combination. The number of tracks traversed by the beam spot is
For tracking servo control
Zero cross signal TZCS generated from the locking error signal
Count transitions across zero (hereafter referred to as zero crossings)
Obtained by: On the other hand, as described above, the optical disk or track
For example, at 1800 rpm, peak to peak at a frequency of 30 Hz
It rotates with an eccentricity of 100 μm. 100μm value
Corresponds to about 60 tracks with a pitch of 1.6 μm
You. Therefore, in the first method, in the radial direction of the track eccentricity,
When the speed exceeds the radial speed of the beam spot,
An error occurs in the zero-cross signal, and
Counting errors occur. So the jumping is over
After reading the ID (identification) number written to each track
Must be, and then the read track ID number
Move the lens based on the beam spot position
Must be modified to reach the desired track by
Absent. As a result, truck jumping takes a long time
It costs. In the second method, track traversal is performed for each track.
If so, the crossing track count is accurate. This
In the track-by-track jump method,
King actuator 21 drives lens 20 to beam
Move pot BS from current track 10a to target track 10d
Lend. Then, as shown in FIGS. 2A and 2B,
Repeating the pumping, that is,
To decelerate current -ia.
When deceleration is applied to the track actuator
The following procedure is performed for each track. Jeans for each track
In ping, the beam spot is one track jump
After finishing a track, the track is stable immediately due to its characteristics.
I can't follow. Therefore, the beam spot becomes small servo.
Therefore, until the track is captured (tracking error signal
Settling time must be provided until TES is almost zero)
It is. The beam spot moves to the adjacent track and
To stop at the center of the rack, a relatively long time such as 2.5 ms
It takes a long time. Therefore, many tracking jumps
The time required for ping is 2.5ms the number of track jumps
Become. Such a long time is the fast access of optical disc
Cannot satisfy the recent trend. DISCLOSURE OF THE INVENTION The purpose of the present invention is to
Do not stop on each track while counting the numbers accurately.
And provide a method for high-speed truck jumping over long distances
Is Rukoto. The track jumping of the present invention
Returning the tracking device to its neutral position on the carriage
Small track on the carriage while operating the servo
Beam spot in the radial direction of the track
Accelerate until it is faster than degrees;
Speed of the microspot
Slow down the carriage until it is slow enough to seek
The trajectory from the start of the beam spot acceleration.
Beam spot on adjacent track during the locking error signal
Count the number of zero crossings that indicate movement;
Number of tracks coming and instructions to reach the target track
Small track jumper
This is performed by the step of accelerating and decelerating the locking device. Another method of truck jumping is truck
Beam spot was present when jumping was ordered
Operate the micro track device to stay on the start track
The carriage until the carriage speed exceeds the specified value.
With the micro tracking device mounted on the
Acceleration; stop operation of micro tracking device
Return the micro-track device to the neutral position on the carriage.
Actuate lock to accelerate beam spot; beam
Key until the spot reaches the pre-programmed track
Accelerate the Carriage Further; Micro-Track Device Makes Target Track
Until the beam spot is slow enough to seek
Slow down the carriage; its truck jumping starts
Beam spot in tracking error signal after
The number of zero crosses that indicate that the track has moved to the adjacent track
Counting; count of traversed tracks and target track
With the number of track jumping commanded to reach
Accelerate or decelerate the micro-track device on its carriage by the difference
Is performed by the following steps. It can be applied to the other two methods described above,
Truck jumping method using small truck equipment
Is the tracking error signal during the movement of the beam spot
From that the beam spot has moved to the adjacent track
Measure each time interval of the indicated zero crossings;
Find the time difference between each time interval and a given time interval; then
Adjust the minute tracking device on the carriage by the difference
The time interval between these zero crossings
So that the beam spot is essentially the same as the difference
At a certain speed without stopping on each track in the traverse
As is the case, it is performed by a step of accelerating and decelerating. According to these methods of the invention, the beam spot is
While moving at high speed without stopping on the truck, the bee
Counts the tracks traversed by the
Thus, high-speed and accurate track jumping is performed. The features and advantages of the invention described above will become apparent in the future.
The accompanying drawings, together with other objects and advantages of
This is described in more detail below with a description of
You. In the drawings, like numbers indicate parts. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1A shows an outline of a servo mechanism of an optical recording disk device.
You. Figures 1B to 1G show the principle of micro-tracking servo control
Is explained. FIG. 2 shows a conventional track-by-track jaw.
Clarify the method of dumping. FIG. 3 shows an optical disk drive used in the method of the present invention.
FIG. 2 shows a block diagram of the device. FIG. 4A shows an optical disc to which the method of the present invention can be applied.
Schematically shows the optical head (carriage) used.
You. Figures 4B and 4C show the configuration of lens lock and lens position servo
Is schematically illustrated. FIG. 5 shows the power of the optical disk device in which the present invention is implemented.
FIG. 2 shows a block diagram of the air circuit. FIG. 6 is a detailed circuit diagram of the head circuit shown in the block diagram of FIG.
Indicates a road. FIG. 7 shows the TES generation circuit, all signal generation circuit, and A of FIG.
GC circuit, zero-cross detection circuit and off-track detection circuit
Indicates a road. FIG. 8 is a phase compensation circuit and a return signal generation circuit of FIG.
Details, lock-on switch, drive circuit and power amplifier
The details are shown below. FIG. 9 shows the principle of the second track access method of the present invention.
Is explained. FIG. 10 is a flowchart of the preferred embodiment of the present invention shown in FIG.
Indicates a chart. FIG. 11 is a tie diagram of the preferred embodiment of the present invention of FIGS. 9 and 10.
3 shows a mining chart. FIG. 12 is a block diagram of the second preferred embodiment of the present invention shown in FIG.
Shows a raw chart. FIG. 13 illustrates the track-by-track speed control method of the present invention.
You. FIG. 14 shows the speed control method for each track of the present invention shown in FIG.
3 shows a flowchart. FIG. 15 shows the speed control for each track of the present invention shown in FIGS. 13 and 14.
3 shows a timing chart of the method. BEST MODE FOR CARRYING OUT THE INVENTION A preferred embodiment of the present invention is a micro-track using a lens.
The following description is made with reference to the case of the lock device. First, the optics, which is a carriage with a lens
The head will be described. In Figure 4A, generated by semiconductor laser 24
Light is converted into a parallel beam by the collimator lens 25a.
The cross section of the light beam is adjusted by the perfect circular correction prism 25b.
Is corrected to a perfect circle, and the light beam is decentered.
23, and further passes through the quarter-wave plate 25c to the objective lens 20.
Beam spot on the optical disk 1 (Fig. 1A)
The focus is on BS. The beam on the optical disk 1
The reflected light from the spot passes through the objective lens 20 and quarter-wave plate 25c.
Through the converging lens 27
Incident on the four-divided light receiver 26. Objective lens 20 is axis 28a
Attach to one end of the main body 28 of the actuator that rotates above
The other end of the main body is provided with a slit 28b.
Have been. The main body 28 is provided with a coil holder 28c.
The coil holder 28c has a converging coil around it.
22 and spiral tracking coil on the side
21 and a magnet 28d surrounding the coil 28c.
Have been killed. Therefore, when a current is applied to the focusing coil 22, the actuator is actuated.
The eta 28 has the objective lens 20 mounted thereon and
Move the axis up or down in the X direction in the figure to change the position of the focal point.
And the actuator coil (tracking
When a current is applied to the coil 21, the actuator 28
Around the axis 28a of the track in a direction perpendicular to the track,
That is, you can change its position in the radial direction of the track
You. The slit 28b on the other end of the actuator 28
On Rigi 2 (Let's call lens head 2 as Carriage 2)
A position sensor 29 is provided. The position sensor 29 is a light source
29e and the quadrant receiver 29 are switched as shown in FIGS. 4B and 4C.
Face each other through lit 28b
Is located. A window W is provided in the slit 28b.
And the four photodiodes of the receiver 29 through the window
29a to 29d receive the light beam from the light source 28e. Therefore,
As shown in FIG. 4B, light reception on photodiodes 29a-29d
The distribution depends on the displacement of the actuator 28 in the α and X directions.
Change. Therefore, the radial direction of the track on carriage 2
Lens position signal LPS indicating lens displacement and focus method
Focus position signal FPS is used for focusing and tracking.
Four photodiodes 29 in the same way as King Servo
From the outputs A, B, C and D from a to 29d respectively,
Can be LPS = (A + C)-(B + D) FPS = (A + B)-(C + D) These lens position signals LPS and FPS will be referred to as neutral positions in the future.
Each of the strokes and rotations on the carriage
The displacements X and α from the approximate center position are S-shaped.
You. Each signal is in its neutral position as shown in Figure 4B
Then, it becomes zero. In this way, the signals
To return the spring to its neutral position.
Can be created. These functions are available with lens lock and
Called cas rock, its original purpose was to move the carriage.
Prevents the lens from floating during movement
Not very far from the center of the tracking servo operation range
To prevent it from passing too far. The lens position signal LPS indicates that the lens is neutral on the carriage.
In order to move back to the position,
May be fed back negatively. This is dual servo control, lens
What is called position servo control or simply position servo control?
Can be done. The purpose of this position servo control is
Range of control deviates from allowed range of lens on carriage
It is also to prevent you from doing so. Next, referring to the circuit diagram of FIG. 5, the details of the present invention will be described below.
Will be described. Operation formed by microprocessor
The control unit (hereinafter referred to as MPU) 7 (not shown)
Receives a track jumping instruction from the next processor.
To store the number of tracks D to jump to;
Trigger instructions by running the embedded program.
Racking servo control unit 3, focus control unit 4, and
Emitted to the carriage control unit 5. The MPU7 is a lens advance signal.
No.FWR, lens reverse signal RVS and lock-on signal LKS
To control the beam spot position
Turns off the track zero cross signal TZCS from the power detector 34a.
The track signal TOS is received from the off-track detector 34b. As shown in FIG. 6, the head circuit section 6 includes a four-divided photodetector.
RF creation time to create RF signal RFS from output a to d from 26
Path 60, amplify the output of four photodiodes 26a-26d
Amplifier 61 for outputting servo outputs SVa to SVd, position sensor 29
From the outputs A to D of the four photodiodes 29a to 29d.
Signal generating circuit 62 for generating the position signal LPS
It has a light receiver 26 and a constant voltage power supply 63 for the position sensor 29.
In the head circuit 6, as shown in FIG.
Is the Zener diode ZD, capacitor C and resistor R
And four photodiodes 26a of the four-segmented light receiver 26
To 26d and four photodiodes 29a to 29 of the position sensor 29
d to supply them with a power supply voltage V. Differential
The LP generation circuit 62 composed of an amplifier includes photodiodes 29a-2
The differential amplification of the outputs A to D of 9d, that is, (A + D)-(B +
D) is performed to create a lens position signal LPS. RF work
The forming circuit 60 includes a high-pass filter and includes four photo
The outputs of Iodes 29a-29d are applied via the differentiation capacitor C1.
Yes, output to operational amplifier 60. Further, the amplifier 61
Amplifiers 61a each connected to photodiodes 26a-26d
And servo outputs SVa to SVd. Returning to Fig. 5, TES (tracking error signal) creation
Whether the circuit 30 is the servo output SVa to SVd of the amplifier 61 (61a to 61d)
Then, a tracking error signal TES is created. Create all signals
The circuit 31 adds the servo outputs SVa to SVd and sets the total reflection level.
Create a full signal DSC indicating the AGc (Automatic Gain C
ontrol) circuit 32 transmits the tracking error signal TES
No. (total reflection level)
Performs AGC to correct for variations in irradiation beam intensity and reflectivity.
U. In the phase compensation circuit 33, the tracking error signal TES
Is differentiated and becomes proportional to the tracking error signal TES.
Added to advance the phase. The zero-cross signal detector 34a detects the tracking error signal.
Track zero crossing by detecting zero crossing transition of TES
Outputs signal TZCS to MPU7. Off-track detector 34b
Indicates that the tracking error signal TES is
A predetermined voltage level that is higher or negative than the pressure level Vo.
It is lower than Vo, that is, it is off track
And outputs the off-track signal TOS to the MPU 7.
Servo switch 35 outputs servo signal SVS from MPU7.
Closes the servo loop when there is no servo signal
Open the servo loop. The return signal creation circuit 36
From the lens position signal LPS obtained from the path 62, as shown in FIG.
Return force to return to the neutral position on the carriage.
A return signal RPS generated at the tutor 28 is created. Lock
ON switch 37 is closed by lock-on signal LKS from MPU7.
The return signal RPS to servo serv
To stop the introduction of the return signal to the servo loop.
The drive circuit 38 outputs a forward acceleration signal according to the lens forward signal FWR.
Signal + V to the reverse deceleration signal-according to the lens reverse signal RVS
V and create a servo switch 35 and lock ounce
The sum of the outputs from the switches 37 is output. The power amplifier 39
The output of the drive circuit 38 is amplified and the track actuator
The track drive current TDV is supplied to the file 21. Details of the minute tracking servo control unit 3 are described in the seventh and
It is shown in FIG. As shown in FIG. 7, the TES creation circuit 3
Add the servo outputs SVa and SVb via input resistors r1 and r2, respectively.
The summing amplifier 300 and the servo outputs SVc and SVd are connected to the respective resistors r3 and r3.
4 and a summing amplifier 301 and a summing amplifier 300.
From the output-(SVc + SVd), the output of the adder 301 is-(SVa +
SVb) and the summing amplifier 302
From the tracking error signal TES ｛= (SVa + SVb)-(S
Vc + SVd)｝ is output. All signal creation circuit 31
Addition that adds the outputs SVa to SVd via the input resistors r5 to r6
Including amplifier 310, total reflection level signal DCS ｛= SVa + SVb +
Outputs SVc + SVd｝. The AGC circuit 32 receives the tracking error signal TES
Depending on the output of the operational amplifier 320 and the operational amplifier 302,
The first FET that controls the voltage division of the input side of one operational amplifier 320
(Field effect transistor) 321 and total reflection level signal DCS
Is input, and the second operational amplifier 322 which controls the FET 321
And a second F that controls the voltage division of the input of the second operational amplifier 322.
ET323 and the total reflection level output from the operational amplifier 322.
The first FET 321 is controlled by the
AGC tracked (TES / DCS) from the output of step 320
An error signal TES is obtained, and the second FET 323
Compensate for the non-linear characteristics of FET 321 and obtain linear characteristics
It is provided for. Zero cross detector 34a is an AGC circuit
Tracking error signal TES from 32 and zero cross potential
Comparator 340
The track zero cross signal TZCS is output from 40. The off-track detector 34b outputs the tracking error signal T
ES is compared with a predetermined value Vo, and when TES> Vo, the “high” level
A first comparator 341 for generating an output, and a predetermined value
(−Vo), and when TES <−Vo, output of “high” level
A second comparator 324 for generating a force
Output the sum of data 341 and 342 as off-track signal TOS
You. The operational amplifier 330 includes a resistor rg and a capacitor Cg.
And a proportional circuit consisting of the resistor Rg.
The phase compensating circuit detects the tracking error signal of the AGC circuit 32.
The signal of the differential and proportional sum of
-The signal TCS, which gives the phase advance element to the signal TES, is
Output to the switch 35. The return signal creation circuit 36 is provided with the lens position from the LP creation circuit 62.
Operational amplifier 360 that amplifies the input signal LPS and operational amplifier 360
And a phase compensation circuit 361 for phase compensation of the output of
Outputs signal RPS. Lock-on switch 37 locks
Closes when the ON signal LKS is output and servos the return signal RPS
A first switch 370 added to the signal TCS of the switch 35;
Inversion circuit 371 that inverts the lock-on signal LKS, and inversion lock
When the ON signal ▲ ▼ is output,
A second switch 372 that closes when the signal is stopped. The drive circuit 38 includes an addition amplifier 380 and a lens advance signal FWR.
Works to transmit to forward drive voltage + V summing amplifier 380
The first switch 381 and the lens reverse signal RVS
Work to transmit the reverse drive voltage -V to the summing amplifier 380.
Drive signal (voltage) + V, -V
And the sum of the control signals TCS and RPS from the summing amplifier 380
I do. When adding the signal TCS and RPS, the signal RPS is
Set weakly. The power amplifier 39 includes a series two-stage amplifier 390.
And 391 amplify the output of the drive circuit 38, and
The drive current TDV is supplied to the actuator 21. The operation of the above embodiment will be described below. First, Fig. 9
Will explain the concept of the track access of the present invention. Up
In the configuration of the above-described embodiment, the lens is
Since it is operated as a racking means,
By moving the lens device, i.e., the lens 20 in this embodiment.
This track access is called lens seek in the future. Carry
Carriage Sea to perform track seeks by moving di 2
Call At first the carriage 2 is fixed to the disc
I have. Section (a) of FIG. 9 is a lens seek section.
Where the beam spot, or lens, is the track
Beam spot is projected when jump is commanded
Start moving from the started track. Lens accelerates
Beam spot speed
It is accelerated on the carriage until it exceeds the maximum speed Vec of the mind. This
In the section (a), the fine tracking control is stopped.
Therefore, the lens position servo continues to operate. Follow
The carriage returns the lens to a neutral position on the carriage.
Lens position control function
Follow and start moving. As a result, the once increased
The sense position signal is near zero. At that time, lens seek
The eccentricity of the lens due to
Greater than the radial speed of the rack. Therefore, the beam
The number of tracks that the spot has crossed is track zero
Accurate counting from loss signal TZCS. In section (b), the beam spot is the number of track jumps
To accelerate the carriage further until it reaches almost half of
Therefore, the carriage seek section that accelerates the beam spot
Between. In section (c), the speed of the beam spot is
To slow down the carriage until it is slower than the limit speed Vls
This is the section where the beam spot is decelerated,
Below the field speed, lens seek deceleration can be performed reliably, but eccentricity
Faster than the track radial speed Vec. Section (b) and
In (c), the speed is higher than the radial speed Vec of the eccentric track.
Therefore, the number of tracks crossed by the truck can be reliably counted.
You. In section (d), the beam spot is
Carry the beam spot, i.e. lens 20
Drive in the opposite direction by the
Slow down the spot. In section (d), the beam spot
Speed is higher than the radial speed Vec of the eccentric track
Therefore, the number of tracks crossed by the truck can be accurately counted.
You. The circuit block diagram of FIG. 5, the flowchart of FIG.
FIG. 11 and the timing chart of FIG.
The work is described in detail below. The beam spot is
King servo control and position servo control provide one
The track on the inside of the disc.
He was ordered to jump. Therefore, the inward direction will be referred to as the forward direction, and the outward direction
Called backward direction (reverse direction). In FIG. 10, in step 1, the minute track servo is
Stopped, lens position servo is in operation, and section
The lens seek acceleration shown in FIG.
The lens that moves the beam spot in the reverse direction, that is, outward
Stop the reverse signal RVS and move the beam spot inside the carriage.
Use the lens advance signal FWR to move the lens
The lens 20 is started by inputting to the
It is accelerated inward on the carriage. The lens position servo is
So Carriage 2 automatically follows the beam spot
Go. The acceleration / deceleration value is based on the track zero cross signal TZCS.
Based on the measured beam spot velocity, the signal FWR or
Can be controlled by the application period of RVS. Lens seek
The lens system movable on the carriage is originally a small tracking
Designed to be fast enough to move at high speed
The beam spot speed can easily be
Faster than radial speed. One of the preferred methods of lens seeking is to use a track
There is a track-by-track speed control method. using this method
The speed of the beam spot traversing each track
By monitoring the cycle of the rack zero cross signal TZCS,
And control, i.e. acceleration / deceleration,
Move at almost constant speed without stopping on the truck
I can do it. Details of this method will be described later. End of step 1, ie, end of section (a) in FIG.
In this case, the lens position signal is almost zero,
Is almost neutral on the carriage. In step 2, the beam spot velocity is
It is determined whether the speed is sufficiently higher than the radial speed. This discrimination
Indicates that the MPU 7 is using the track when the beam spot crosses one track.
Beam zero based on the time interval of the zero cross signal TZCS.
Whether the pot exceeds the radial speed of the track eccentricity
It is done by judging. If the determination is YES, execute step 3
However, if the determination is NO, step 2 is repeated. In step 3, the lens position servo control is stopped and
Signal INR that accelerates the carriage inward
By applying to the king control circuit 52, the section (b)
Is started. This step
By stopping the lens position servo control signal PSS during
Stops the lens position servo control and sets the lens lock signal.
Activate the lens lock by outputting LKS
You. Step 4 is performed simultaneously with step 3.
Activate the lens lock to interrupt the lens seek
You. In step 5, the carriage seek in section (b) is performed.
The beam spot should start decelerating the carriage seek.
It is determined whether the truck has arrived. Carriage seek reduced
Tracks that should start speed are acceleration or deceleration,
That is, when acceleration or deceleration is almost the same,
Almost half or fewer tracks to jump
Selected by a small number. Therefore, specific characteristics and conditions such as friction
If not, the last track on which carriage deceleration begins
The appropriate position is different from half the number of track jumps
You. Therefore, the truck to start carriage deceleration is
It may be calculated by a program incorporated in MPU7.
No. If the determination is NO, step 5 is repeated. In step 6, when the determination in step 5 is YES, the signal I
Stops NR, and then outputs signal OUT that decelerates the carriage outward.
By applying it to the carriage tracking control unit 2,
As shown in the carriage seek section (c), the carriage 2
Slow down. In step 7, the beam spot is at the limit speed Vls
Slower but faster than the radial velocity Vec of tracking eccentricity
It is determined whether a certain speed has been reached. The judgment is NO
If so, repeat step 7. In step 8, when the determination in step 7 is YES, the signal O
Stop carriage seek deceleration by stopping UT
You. In step 9, the lens lock signal LKS is stopped, and
By outputting the servo position signal PSS,
The lens seek deceleration in (d) is started. This lens sea
In the opposite direction of track jumping, that is, outward,
Lens reverse signal RV such that the lens moves on the carriage
By applying S to the lens drive circuit 38,
The pot slows down. Since there is a lens position servo,
Rigidity is based on the lens position signal generated during this lens seek.
Automatically decelerates to follow the beam spot.
Number of tracks traversed by beam spot during lens seek
Is accurately counted from the track zero cross signal TZCS.
The beam spot speed at the start of this lens seek low speed
Degree is slow enough for the lens to stop at the target track
If the beam spot is
Rack, usually one track before the target track
It keeps moving at a constant speed until it reaches. Strictly speaking, that
This will be explained later in the description of the deceleration period in FIG.
Half a track before the target track. And, as mentioned earlier, the lens is the lens backward signal
Decelerated by RVS and stopped at target track. Young
The beam spot speed at the start of this lens seek is
Slow enough to ensure that the lens stops at the target track
If not, the beam spot is the beam spot speed
But the lens is slow enough to stop at the target track.
Until the lens reverse signal RVS
Decelerated on the floor. The speed control for each track is performed in the section (d).
It can be used favorably for lens seeking. In the description of this preferred embodiment, step 9
Position servo is stopped, but this is in the section (d).
It is not an absolute requirement to achieve lens seek,
The reason is that the carriage is not a lens position servo.
Can be stopped by a stage, eg signal OUT
It is. In the description of this preferred embodiment, steps 1 and
In step 2, the lens lock is stopped, but the operation of the present invention is not stopped.
The lens lock must be stopped to perform each step.
It is not an opposite condition. Because lens lock and lens position servo
Signal is set weaker than the
Lock or lens position servo is controlled by a spring or rubber
Lens lock as a lens lock means.
Through all steps from the beginning, even if you cannot stop
And may be left operating. A second preferred embodiment of the present invention is illustrated in the flow chart of FIG.
This will be explained with reference to FIG. Beam spot is small tracking
Start track by servo control and position servo control
And jumps to the inside of the disc
Was ordered. In step 1, track access is instructed
The beam spot on the track where the beam spot was
With the racking servo on, the lens position servo and
And lens lock are stopped, and the output
Is applied by applying the inward movement command signal INR.
Accelerate the di. This allows the lens to be neutral on the carriage
The lens position signal deviates from the position and increases. Steps
2 Now, lens position signal corresponding to the amount of carriage movement
Signal is more than a certain radial displacement of track eccentricity.
It is determined whether or not it indicates that it is larger. This predetermined amount
Is a value sufficiently larger than the radial displacement of the track eccentricity.
Is chosen. When the carriage moves this amount,
Carriage speed already greater than the truck's radial eccentric speed
Speed. If the judgment is NO, go to Step 2.
repeat. In step 3, the determination in step 2 is YES.
Stop the micro tracking servo and lock the lens.
Work. Therefore, the lens locking force
Move the beam spot back to the upper neutral position. this
Beam spot speed is radial due to track eccentricity
Direction is sufficiently faster than the
The number of beam spot track jumps accurately
Can be counted. In step 4, with the lens lock activated,
Continue Rigi acceleration. In step 5, beam spot
Reached the track where carriage deceleration should start
Is determined. The truck that should start the carriage deceleration is
Acceleration or deceleration, ie acceleration or deceleration
In the same case, almost half the number of tracks to jump
To be elected. Therefore, characteristics and conditions such as friction of the device are different.
Then, the position of the truck where the carriage deceleration should start is
This is different from half the number of track jumps. Therefore, the track to start carriage deceleration is
The calculation may be performed by a program incorporated in U7.
If the determination is NO, step 5 is repeated. In step 6, when the determination in step 5 is YES, the
Rigi 2 stops the inward carriage acceleration signal INR, and the first
Same as for the section (c) of the carry seek in the embodiment.
Deceleration, that is, applying the outward carriage acceleration signal OUT
And decelerate. In step 7, the process of the first embodiment is performed.
Determine the beam spot velocity in the same manner as in Step 7.
You. If the determined result is NO, step 7 is repeated. In step 8, when the determination in step 7 is YES, the signal O
Stop UT and stop carriage seek. And then
In the same manner as in the section (d) of the embodiment, the lens position signal
Stop LKS, more preferably activate lens position servo
The lens seek deceleration is started. this
During lens seek deceleration, the beam spot
On the carriage in the opposite direction of the track jump, i.e. outside
Lens drive the lens reverse signal RVS to move to the side
By applying to the circuit 38, the speed is reduced. Lens position
Carriage occurs at this lens seek because there is a servo
Automatically added to the beam spot according to the lens position signal
Slow down to follow. Beams during lens seek
The number of tracks crossed by the pot is the track zero cross signal
Accurately counted from TZCS. If this lens seek is reduced
When the beam spot speed at the start of
Beam spot if it is slow enough to stop
The beam spot is a certain track, usually a target track.
A constant speed until reaching the track just before the rack,
The lens will slow down to the target track
Stop at. The beam spot at the start of this lens seek
Make sure that the cut speed stops at the lens or target track.
If not slow enough, the beam spot
When the lens stops at the target track
Until it is slow enough, the lens reverse signal RVS is used
Slow down or slow down. Track-by-track speed control
It can also be used preferably for this lens seek. In a second preferred embodiment, a lens position servo and lens
The lock is stopped in step 1, and the lens lock is
Worked in step 3, but the lens position servo or lens
Whether each step is stopped or operating depends on each step
It is not an absolute condition to achieve the operation of the invention, but it is
Each step is desired to achieve the operation of the invention.
No. Because the lens lock and lens position servo are
Signal is set weaker than the
Use a spring or rubber for the locking and lens position servo.
Use the damper as lens locking means to lock the lens
Through all steps from the beginning, even if you cannot stop
And keep it running. One preferred method of lens seek in the above two embodiments and
Preferred embodiment of the track-by-track speed control method cited above
The principle diagram of FIG. 13, the circuit block diagram of FIG.
The flowchart in FIG. 14 and the timing chart in FIG.
This will be described below with reference to FIG. In addition, there is a star
Acceleration from multiple tracks, constant speed movement of multiple tracks, and
And one round of reaching the target track. This way
Can be used to fix the carriage or
Used in a state following the pot. The circuit configuration of this method is based on the two embodiments shown in FIG.
Is essentially the same as However, MPU7 has
A timer 7a is provided, and a predetermined acceleration period ta is stored in the memory 7b.
One track crossing target period tb corresponding to the target speed, predetermined reduction
Speed period tc, number of tracks D to jump, cut target speed
To change the track number Do, for each track speed control
Acceleration / deceleration control pulse period t, processing time tp, high-speed target speed
For the high-speed target period tbh corresponding to
The corresponding low-speed target period tb1 is stored. FIG. 13A shows the existence of a beam spot on the X axis.
Track position, elapsed time, and beam axis on the Y axis.
Speed, tracking error signal TES, zero cross signal
2 shows the relationship between the signal TZCS and the acceleration / deceleration control signal. MPU7 starts track access from upper processor
If you receive a command, you are instructed the number of track jumps
If “n” is larger than (Do + 2), it is shown in FIG.
Thus, the target speed is near the target track n (n-
Do-2) Set the high-speed target speed Vh up to the 2nd track
; Low target speed after (n-Do-2) th track
Set to Vl. Here, Do is the movable part of the lens system.
Beam spot with sufficient margin considering inertia etc.
But crosses Do tracks from low target speed Vl
A number is chosen that can be easily stopped on the truck. This number
Do is called the number of speed switching tracks in the future. High speed target speed
Vh is the highest possible lens control for high speed performance.
High speed is chosen. Is the value of the low-speed target speed Vl
Target beam while the beam spot crosses one track
Speed, for example, about 200 per truck
μm. The commanded track jump number n is
When it is smaller than (Do + 2), as shown in Fig. 13B, the low-speed target
Only the speed Vl is set. The dotted line in Fig. 13 indicates the target speed.
This shows the actual speed Vr when controlling. The operation will be described with reference to the flowchart of FIG.
Now, by applying the servo operation signal SVS of the MPU7, the servo
Switch 35 is in operation and lock-on switch 37 is
The track jump command is issued by stopping the lock-on signal LKS.
Let's say it's open until you receive it. That is, the micro tracking sensor
The robot loop is closed and the tracking error signal TE
Track actuator 21 is minute by control signal TCS from S
Servo controlled, beam spot follows track 10a
doing. In step 1, in this state, the host processor
Rack jump instruction and track jump number D are MPU7
The track jump procedure shown in Fig. 14
Start. In this example, the track jump is inward
Was ordered. First, the MPU7 is
[2] is subtracted from the number of loops D (= n) and stored in the memory 7b.
You. This [2] is subtracted from the second track (15th track).
Acceleration takes place during the movement to 10b) in the figure,
Stopping at the target track is slowed down.
Subtract track crossing twice from D
Is performed (D-2) times for the remaining tracks. Next, the MPU 7 determines the number of tracks D (= n−2) in the memory 7b.
And speed switching track number Do, and if D> Do
In the case of FIG. 13A, the target period tb is high.
Speed target period tbh is set, and during acceleration period ta, speed Vh
Tah for acceleration is set. If D ≦ Do, it is the case of FIG. 13B,
The low-speed target period tbl is set in the target period tb, and the acceleration period t
a is set to tal for acceleration up to the speed Vl. Next, the MPU7 stops the servo operation signal SVS and
Open switch 35 and check the tracking error signal TES.
-Open the volume. That is, the tracking error signal TES
Servo by will not work. This is Beams
The movement of the pot is controlled smoothly as instructed by MPU7, and
To get accurate actual speed from the locking error signal TES
is necessary. Next, the track jump direction of MPU7
Either, that is, whether the radius of the optical disk is outward or inward
Investigate and, if outward, perform outward procedures. Outside
The procedure for the direction is step 2 and below.
The procedure is almost the same. In step 2, the MPU 7 outputs the lens advance signal FWR for the period t.
Apply the acceleration voltage + V for the period ta while
You. That is, after outputting the forward signal FWR, the MPU 7
Set a to the complement of acceleration period ta in memory 7b,
Start the timer 7a. Timer 7a uses the complement of acceleration period ta.
Since it is set, count clock pulses and
When ta is counted, a count-up signal is output. Cartoon
MPU7 stops timer 7a when the
Stop the forward signal FWR. Therefore, the first of the drive circuit 38
Switch 381 conducts for ta period, accelerating + V period for ta period
The voltage is applied to the summing amplifier 480, and the power amplifier 39
The acceleration current is tracked as the track drive current TDV during the period.
Pour it into the actuator 21 and use the objective lens (ie, beam spot).
G) to the high-speed target speed Vh. In step 3, the MPU 7 outputs the track zero cross signal TZ
Monitor CS and check if the track zero cross signal TZCS is “0”
Transition to “1” state, ie, the track zero cross signal TZCS
The timing of rising transition is detected,
Start measuring the interval of the low cross signal TZCS. That is, MPU7
Is the target period tb (tbh or tbh) corresponding to the target speed Vh or Vl
Reads tbl) and stores the complement of the target period tb in timer 7a.
To start the timer 7a. In step 4, the MPU 7 outputs the track zero cross signal TZ
Monitor CS and check if the track zero cross signal TZCS is “0”
Transition to “1” state, ie, track zero cross signal TZ
The timing of the rising transition of CS is detected and the
The measurement of the interval of the zero cross signal TZCS ends. Timer
7a is set to the complement of the target period tb.
When tb is counted, a count-up signal is output. Follow
If the rising transition started by timer 7a
The time interval T between the next rising transition after the end of the period 7a is
T ≧ tb (that is, the actual speed is equal to or higher than the target speed)
Slow), the timer 7a will be
It has already counted up. Conversely, T ≦ tb (immediately
(The actual speed is faster than the target speed.)
Upon completion, the timer 7a has not yet counted up. In step 5, therefore, the MPU 7 sets the timer 7a to count.
To see if they are up. Count up
If the actual speed is the same as or slower than the target speed
This means that the lens is accelerated. Timer 7a
Reads the count until timer 7a stops even if it counts up.
MPU7 counts down the value of timer 7a
Is read out, and then the control pulse period t is calculated. So
Thus, MPU7 outputs lens forward signal FWR for acceleration
Then, the complement value of the system pulse period t is set in the timer 7a,
Start IMA 7a. The timer 7a measures the control pulse period t.
When counting, the timer 7a counts up, so the MPU 7
When the timer 7a counts up, the timer 7a is stopped and
Stop the forward signal FWR. In this way, the drive
The first switch 381 of the path 38 operates for a period t,
+ V accelerating voltage is applied to the summing amplifier 480, and the power amplifier 3
From 9 the acceleration current as the track drive current TDV is
Then, the lens 20 is accelerated.
If the actual speed is equal to the target speed, Δt = 0, and
Therefore, since t = 0, the first switch 381 is only one
It only conducts momentarily. In step 6, the timer 7a counts up.
If not, MPU7 judges that actual speed is faster than target speed
And slow down the lens. For this goal, MPU7
The count value n of 7a is read. Timer 7a count up number
Since N is known in advance, the target period tb and the track zero
With the interval of the rising transition of the cross signal TZCS (period T)
The difference (tb−T) = Δt is obtained from (N−n), and the control pulse
Calculate the scanning period t. Then, the MPU 7 outputs the reverse signal RVS for the lens deceleration.
Set the complement value of the control pulse period t in the timer 7a
Then, the timer 7a is started. Timer 7a counts up
Then, the MPU 7 stops the timer 7a and outputs the lens reverse signal RVS.
Stop. Therefore, the second switch 382 of the driving circuit 38
Work for t period, -V deceleration signal applied to summing amplifier 460
Then, the deceleration current is used as the track drive current TDV during the t period.
It flows from the power amplifier 39 to the track actuator 21 and
Slow down 20. In step 7, the track zero cross signal is sent in step 4.
No. TZCS rising transition is detected, so MPU7
Is the trace in memory after step 5 or 6.
The jump jump number D is updated to (D-1). And then
MPU7 has D

[0] is checked. Next, the MPU 7 determines that the updated track jump number D is
It is determined whether or not the speed switching track number Do is smaller than Do. That is, if the remaining track jump number D is smaller than the speed switching track number Do (that is, D ≦ Do), the target speed is set except for the case where the target speed is already set to the low target speed. Is updated to the low target speed Vl.
If not (ie, D> Do), the target speed is kept at the high target speed Vh. Next, the MPU 7 determines whether D = 0. If 0 ≠ 0, it means that the beam spot has not reached the track immediately before the target track. If 0 ≠ 0, that is, if D = 0, it means that the beam spot has reached the track immediately before the target track. In step 8, if 0 ≠ 0, the interval measurement of the track zero cross signal TZCS and the above-described speed control for each track are performed again. For this purpose, the MPU 7 sets the target time tb in the timer 7a, activates the timer 7a, and returns to Step 4. At this time, the control pulse period t and the processing time tp for performing the processing in steps 5 or 6 and 7 have elapsed since the rising transition was detected in step 4. Therefore, the timer
(Tb-t-tp) is set for the target period tp in 7a. In step 9, the beam spot reaches the track immediately before the target track by repeating the track-by-track speed control in this manner, and it is determined that D = 0 at that time. Then, the MPU 7 commands deceleration for stopping the lens. That is,
While monitoring the track zero cross signal TZCS, the MPU 7 detects the falling transition of the track zero cross signal TZCS, which is the timing of starting the lens deceleration, that is, the transition from “1” to “0”. A falling transition in the tracking zero-cross signal TZCS indicates that the beam spot has moved to the next tracking. Tracking zero cross signal TZCS
When the falling transition of MPU7 is detected, the MPU7
RVS is output to start lens deceleration, the complement of a predetermined deceleration period tc is set in the timer 7a, and then the timer 7a is started. When the timer 7a counts up, that is, when the period tc is counted, the MPU 7 stops the lens backward signal, activates the servo operation signal SVS, and stops the track jump after a predetermined adjustment period has elapsed. That is, the second switch 382 of the drive circuit 38 operates during the tc period, the deceleration voltage −V is applied to the addition amplifier 480 during the tc period, and the deceleration current is supplied from the power amplifier 39 as the track drive current TDV during the tc period. And the lens, that is, the beam spot, decelerates and stops. And then
Servo switch 35 conducts and tracking error signal TE
The servo loop of S is closed, the track drive current TDV based on the control signal TCS of the phase compensation circuit 33 flows from the power amplifier 39 to the track actuator 21, and the fine track servo control starts. When the servo switch 35 is conductive, the beam spot is on the target track and its speed is zero, so that the track servo control can be started stably. In the above description of the preferred embodiment, the lens lock is stopped. However, it is also possible to perform the track-by-track speed control while operating the lens lock. This is because the lens lock is weaker than the lens seek signal. When the lens lock is performed mechanically by a spring or a rubber damper, there is no way to stop the lens lock. The details of the timing chart of FIG. 15 are described below.
FIG. 15 shows waveforms when track jumping is performed on track 10f, which is five tracks ahead of track 10a. First, the micro-track servo is stopped and the lens advance signal
FWR is output, and an acceleration current is applied for a period tah so that the beam spot reaches the target speed Vh. Next, the time interval T1 between the second and third rising transitions of the tracking error signal TES is measured by operating the timer 7a to determine the actual speed, and is compared with the target period tbh corresponding to the target speed Vh. Young, tbh>
If it is T1, it means that the actual speed is higher than the target speed Vh in step 6, so the lens reverse signal RVS is output for a period corresponding to the period difference (tbh-T1), and the deceleration current flows for the period t. To return the actual speed to the target speed Vh. Next, the interval between the third and fourth rising transitions of the track zero cross signal TZCS is to be measured. As described above, after the third rising transition of the track zero cross signal TZCS, the speed control for each track is performed. 5,
Since the steps 6 and 7) are performed, it is impossible to measure the interval after the third rising transition of the track zero cross signal TZCS. Therefore, after the speed control for each track, the timer 7a is operated to measure the interval until the fourth rising transition, and the target time is set to (tb
-T-tp). In this example, since the interval T2 is equal to the target time tb (= tb-t-tp), the acceleration or deceleration is not substantially performed in step 5. Similarly, track-by-track speed control is also performed between the fourth and fifth rising transitions. In this case, since the interval T3 is larger than (tb-t-tp), that is, the actual speed is lower than the target speed Vh, the acceleration is performed during the period t. In this way, when the beam spot is controlled at the high target speed Vh and reaches the (n-4) th track (10n-4), the target speed is set to the low target speed because the beam spot is near the target track. Switch to V1. Further, similarly, the (n) th of the track zero cross signal TZCS is
At the (-3) th and (n-4) th rising transitions, the track-by-track speed control is performed at the low target speed V1. In synchronization with the nth falling transition of the track zero cross signal TZCS signal, a deceleration current is applied for a period t to stop the lens (that is, the beam spot). Immediately thereafter, the fine tracking difference control is applied. The tracking jump number D is also updated by the rising transition of the track zero cross signal TZCS. The outward track jump is almost the same as described for the inward jump in steps 2 through 9 above, with the only difference being that the direction is reversed.
That is, the forward signal FWR via the forward switch 381 in steps 2 and 5 is replaced by the lens backward signal RVS via the update switch 382, and the backward switch 382 in steps 6 and 9 is used.
The lens reverse signal RVS via the forward switch 381 is replaced with the lens forward signal FWR via the forward switch 381, and the detection of the rising transition of the track zero cross signal TZCS in steps 3 and 4 is replaced with the detection of the falling transition. Except for replacing the discrimination with the discrimination of TZCS = 1, all procedures are performed in the same way as jumping inward. As described above, since the beam spot BS does not achieve a long distance track jump at a high speed without stopping each track, the beam spot BS is controlled at a high target speed after the acceleration is started. Moves at the highest possible speed, and in the vicinity of the target track, the beam spot is reduced to a low target speed at which the beam spot can be easily stopped, so that the beam spot is reliably positioned at the target track. When jumping a large number of tracks, for example, a thousand tracks, the track jump of the prior art is to perform a coarse seek (carriage seek) including a period required to enter a fine tracking servo for 40 ms and to read and confirm a track ID. 1ms, and 6ms for a 20-track fine seek (lens seek) required a total of 47ms, but according to the invention, 2ms for 10 tracks of lens seek acceleration, 30ms for coarse seek, and then lens seek 20ms of speed, 6ms for a total of 38ms
Thus, an accurate track jump can be achieved without requiring 1 ms of reading and confirming the track ID. As described above, the track-by-track speed control is performed by measuring the interval between rising and falling transitions of the track zero cross signal TZCS.This speed control, that is, the measurement of the time interval, can be performed without changing the hardware. It can be easily done only by adding or changing. Since the actual speed is compared with a target period stored in the memory, the result of the comparison is known by the presence of the count-up signal. Therefore, the complicated comparison procedure is simplified, and the operation becomes faster. Therefore, the track-by-track speed control of the present invention is advantageous for accessing less than about 100 tracks. In the above embodiment, the target speed has two speeds:
Although high speed and low speed are set, two or more target speeds can be set. Furthermore, the target speed can be set to a single speed if the beam spot can be reliably stopped at the target track without being affected by the eccentric movement of the track. In the above-described embodiment, the tracking error signal TES is generated by the push-pull method. However, other known methods can be used for generating the tracking error signal. In the above embodiment, the detection of the beam spot speed difference is performed by loading the target period into the timer 7a, but the beam spot speed difference is detected by the timer 7a by the track zero cross signal TZ.
It can also be done by measuring the interval between transitions during CS and comparing it to the target period. Further, the timer may be constituted by a software timer. Further, the gain of the speed control feedback loop during the jump may be variable. In the above-described embodiment, the case where the fine tracking control is performed by moving the lens in the radial direction of the track has been described. However, it is apparent that the present invention can be applied to a galvano mirror type fine tracking servo. is there. In the above embodiment, the description has been made using positive logic.
Obviously, negative logic can be applied to the implementation of the present invention. Although the description has been made with respect to an optical disk, the present invention can be applied to an optical storage medium such as an optical card device using a well-known track, and is not limited to a reflection type but also to a transmission type. it is obvious.

Claims (32)

(57) [Claims] 1. An optical recording apparatus having a plurality of coaxial or spiral recording tracks on a recording medium, comprising: a micro-tracking means for moving a light beam spot on the recording medium in a substantially radial direction of the track; A carriage means mounted thereon, the micro-tracking means of which is movable over the track substantially in the radial direction of the track, and which is movable in the radial direction of the track, and detects a reflected light from the recording medium to generate a tracking error signal. Light detection means; and fine tracking control means capable of servo-controlling the beam spot so that the beam spot follows a specific one of the tracks by moving the fine tracking means on the carriage means based on the tracking error signal. A carriage track for moving the carriage means Based on a position signal which becomes zero when the micro-tracking means is at a predetermined position on the carriage means and becomes positive or negative when deviated from the predetermined position in one direction or the opposite direction. Position servo means for keeping the fine tracking means at the predetermined position on the carriage means; (1) stopping the fine tracking servo control of the beam spot and operating the position servo means, (2) accelerate the beam spot by accelerating it until it exceeds the radial absolute velocity of track eccentricity; (2) further accelerate the beam spot by moving the carriage means; Until the beam spot reaches a predetermined speed that can be controlled, (4) Counting the number of zero crossings in the tracking error signal from the start of the acceleration of the beam spot, whereby the position of the track where the beam spot is currently present is calculated. (5) decelerate the micro-tracking means on the carriage means based on the difference between the number of traversed tracks and the number of track jumps commanded to reach the target track where the beam spot should stop Decelerating the beam spot by performing the method. 2. The step (1) includes the following sub-steps: (1) While the beam spot is moving, a time interval of a zero cross in the tracking error signal is measured for each track traversal; Calculating a time difference between the zero-crossing time interval and a first predetermined time interval corresponding to a predetermined speed greater than the radial absolute speed of the track eccentricity; (3) the zero-crossing time interval based on the time difference; Controlling the speed of the beam spot without stopping the beam spot on each track by controlling the speed of the micro-tracking means to be substantially equal to the first predetermined time interval. 2. The method for accessing an optical recording track according to claim 1, wherein: 3. The step (5) includes the following sub-steps: (1) measuring a time interval of a zero cross in the tracking error signal for each track traversal during movement of the beam spot; Determining a time difference between a zero-crossing time interval in the error signal and a second predetermined time interval; and (3) based on the time difference, making the zero-crossing time interval substantially equal to the second predetermined time interval. 2. The method according to claim 1, further comprising: controlling the speed of the beam spot without stopping the spot on each track. 4. The time interval of the zero cross in the tracking error signal is determined by the interval between adjacent isomorphous transitions that occur when the zero cross signal transitions from one polarity to the opposite polarity and the beam spot passes through the center of the track. The method for accessing an optical recording track according to claim 2 or 3, wherein the optical recording track is measured. 5. The method of claim 1, wherein the step (5) comprises: updating the predetermined time interval by a time interval longer than a previously predetermined time interval; and updating the commanded track closer to the target track than the previously commanded track. 4. The optical recording track access method according to claim 3, wherein the sub-steps (1) to (3) are repeated using each of the selected tracks. 6. The last updated predetermined time interval is selected to be sufficiently long so as to ensure that the micro-tracking means can be stopped at the target track, and the last commanded track is sufficient for the target track. The method for accessing an optical recording track according to claim 5, wherein a close track is selected. 7. The method according to claim 1, wherein the step (2) is performed until the beam spot reaches an intermediate point set based on the number of tracks between the jump start track and the target track. 2. The method for accessing an optical recording track according to claim 1, wherein: 8. The optical recording track access method according to claim 7, wherein said intermediate point is approximately half of said track number. 9. An access method for an optical recording track according to claim 1, wherein said step (5) is performed while said position servo means is operated. 10. An optical recording apparatus having a plurality of coaxial or spiral recording tracks on a recording medium, comprising: a micro-tracking means for moving an optical beam spot on the recording medium in a radial direction of the track; The carriage is mounted, the micro-tracking means is movable over the track in a substantially radial direction of the track, and the carriage means is movable in the radial direction of the track. Means for detecting and outputting a position signal; light detecting means for generating a tracking error signal by detecting reflected light from the recording medium; and moving the minute tracking means on the carriage means based on the tracking error signal. This allows the beam spot to follow a particular one of the tracks. A small tracking control means capable of servo-controlling the beam spot to move the carriage means, and a carriage tracking control means for moving the carriage means. (2) When the position signal reaches a predetermined level, the micro-tracking control means is deactivated to start traversing the track of the beam spot. (3) By further accelerating the carriage means until the beam spot reaches a predetermined track,
(4) Then, the beam spot is decelerated by decelerating the carriage means until the beam spot reaches a predetermined speed at which the fine tracking control can be performed. (5) Start track jumping Counting the number of zero crossings in the tracking error signal, thereby determining the track position where the beam spot is currently present; (6) the number of traversed tracks and the beam spot reaches the target track to be stopped Moving the beam spot by moving the micro-tracking means on the carriage means based on the difference in the number of track jumps instructed to access the optical recording track. 11. The step (6) includes the following sub-steps: (1) measuring a time interval of a zero cross in the tracking error signal for each track during movement of the beam spot; Determining a time difference between a zero-crossing time interval in the signal and a second predetermined time interval; (3) based on the time difference, a beam spot such that the zero-crossing time interval becomes substantially equal to the second predetermined time interval. 11. The method according to claim 10, further comprising: accelerating or decelerating the beam spot without stopping at each track. 12. The time interval of the zero cross in the tracking error signal is determined by the interval between adjacent isomorphous transitions that occur when the zero cross signal transitions from one polarity to the opposite polarity and the beam spot passes through the center of the track. 12. The method for accessing an optical recording track according to claim 10, wherein the measurement is performed. 13. The step (5) comprises the steps of: updating a predetermined time interval updated by a time interval longer than a previously predetermined time interval; and updating the commanded track closer to the target track than the previously commanded track. 12. The optical recording track access method according to claim 11, wherein the sub-steps (1) to (3) are repeated using each of the selected tracks. 14. The last updated predetermined time interval is selected to be sufficiently long so that the minute tracking means can be stopped at the target track with certainty, and the last commanded track is sufficient for the target track. 14. The optical recording track access method according to claim 13, wherein a close track is selected. 15. The method according to claim 15, wherein the step (3) is performed until the beam spot reaches an intermediate point set based on the number of tracks between the jump start track and the target track. 11. The method for accessing an optical recording track according to claim 10, wherein: 16. The optical recording track access method according to claim 15, wherein said intermediate point is approximately half of said track number. 17. The step (6) becomes zero when the minute tracking means is at a predetermined neutral position on the carriage means, and becomes positive or negative when deviated from the neutral position in one direction or the opposite direction. Moving the carriage means based on the negative position signal to perform the fine tracking means while operating the position servo means for maintaining the neutral position on the carriage means. Item 12. The method for accessing an optical recording track according to Item 10 or 11. 18. An optical recording apparatus having a plurality of coaxial or spiral recording tracks on a recording medium, comprising: a micro-tracking means for moving a light beam spot movable substantially in the radial direction of the track on the carriage; and reflection from the recording medium. A light detecting means for detecting a light to create a tracking error signal; and moving the micro tracking means on the carriage based on the negative feedback based on the tracking error signal so that the beam spot follows a specific one of the tracks. (1) measuring the time interval of zero crossing in the tracking error signal for each track traverse while the beam spot traverses to each adjacent tracking; (2) The time between the zero-cross time interval and the first predetermined time interval And (3) accelerating and decelerating the micro-tracking means on the carriage based on the time interval such that the time interval of the zero cross is substantially equal to the first predetermined time interval. Accelerating or decelerating without stopping at each track, a method for accessing an optical recording track. 19. The light according to claim 18, wherein said steps (1) to (3) further comprise a sub-step repeated at said updated predetermined time interval. How to access the recording track. 20. An access method for an optical recording track according to claim 18, wherein said step is performed with a carriage fixed. 21. The micro-tracking means is mounted on a carriage means, and the steps (1) to (3) become zero when the micro-tracking means is at a predetermined neutral position on the carriage means. Moving the carriage means based on a position signal which becomes positive or negative when deviated from the neutral position in one direction or in the opposite direction, thereby keeping the fine tracking means at the neutral position on the carriage means. 20. The method for accessing an optical recording track according to claim 18, wherein the method is performed while operating the position servo means. 22. The time interval of the zero cross in the tracking error signal is determined by the interval between adjacent isomorphous transitions that occur when the zero cross signal transitions from one polarity to the opposite polarity and the beam spot passes through the center of the track. 20. The method for accessing an optical recording track according to claim 18, wherein the measurement is performed. 23. The last updated predetermined time interval is selected to be a sufficiently long time interval so that the minute tracking means can be stopped at the target track with certainty, and the last commanded track is sufficient for the target track. 20. The optical recording track access method according to claim 18, wherein a near track is selected. 24. A micro-tracking means for moving a light beam spot on a plurality of recording tracks formed on a recording medium in a radial direction of the recording medium; A carriage means for moving a spot in a direction crossing the recording track; and a tracking error signal generating means for generating a tracking error signal representing a radial displacement of the recording medium between the light beam spot and the recording track. Track counting means for counting the number of times the light beam spot has traversed the recording track based on the tracking error signal; fine tracking control means for controlling the fine tracking means; and controlling the carriage means. Carriage tracking control means to And control means for controlling the minute tracking control means and the carriage tracking control means based on the count value. The control means moves the light beam spot from a first recording track to a second recording track. When you start moving,
Controlling the micro-tracking control means so that the micro-tracking means accelerates the light beam spot until the light beam spot exceeds the absolute moving speed of the recording track in the radial direction due to the eccentricity of the recording track. A device that uses a medium. 25. The control means controls the carriage tracking control means such that after the light beam spot is accelerated by the minute tracking means, the carriage means further accelerates the light beam spot. An apparatus using the optical recording medium according to claim 24. 26. A micro-tracking means for moving a light beam spot on a plurality of recording tracks formed on a recording medium in a radial direction of the recording medium; A carriage means for moving a spot in a direction crossing the recording track; and a tracking error signal generating means for generating a tracking error signal representing a radial displacement of the recording medium between the light beam spot and the recording track. A track counting unit that counts a value of the number of the light beam spots traversing the recording track based on the tracking error signal; a minute tracking control unit that controls the minute tracking unit; and a unit that controls the carriage unit. Carriage tracking control means to And control means for controlling the minute tracking control means and the carriage tracking control means based on the count value. The control means moves the light beam spot from a first recording track to a second recording track. When you finish moving,
Controlling the micro-tracking control means to decelerate the light beam spot by the micro-tracking means capable of decelerating beyond the absolute moving speed of the recording track in the radial direction due to the eccentricity of the recording track. Using optical recording media. 27. The control means, after decelerating the light beam spot by the carriage means until the light beam spot is controlled to a predetermined speed capable of controlling the light beam spot by the fine tracking means, 27. The apparatus using the optical recording medium according to claim 26, wherein the minute tracking control unit and the carriage tracking control unit are controlled so as to decelerate the spot. 28. A micro-tracking means for moving a light beam spot on a plurality of recording tracks formed on a recording medium in a radial direction of the recording medium; A carriage means for moving a spot in a direction crossing the recording track; and a tracking error signal generating means for generating a tracking error signal representing a radial displacement of the recording medium between the light beam spot and the recording track. Track counting means for counting the number of times the light beam spot has traversed the recording track based on the tracking error signal; fine tracking control means for controlling the fine tracking means; and controlling the carriage means. Carriage tracking control means to And control means for controlling the minute tracking control means and the carriage tracking control means based on the count value. The control means moves the light beam spot from a first recording track to a second recording track. When you start moving,
Controlling the minute tracking control means and the carriage tracking control means so as to accelerate the carriage means in a state where the light beam spot is maintained on the first recording track by the minute tracking means. Using optical recording media. 29. The micro-tracking control unit controls the micro-tracking control unit so as to end the state in which the light beam pot is maintained on the first recording track after the carriage unit is accelerated. 29. An apparatus using the optical recording medium according to claim 28. 30. After ending the state in which the light beam pot is maintained on the first recording track, the control means controls the fine tracking means to hold the fine tracking means at a specific position on the carriage means. 29. The apparatus using the optical recording medium according to claim 28, wherein the apparatus controls a tracking control unit. 31. Micro-tracking means for moving a light beam spot on a plurality of recording tracks formed on a recording medium in a radial direction of the recording medium; and recording between the light beam spot and the recording track. Tracking error signal generating means for generating a tracking error signal representing a radial deviation of a medium; track counting means for counting a value of the number of the light beam spots traversing the recording track based on the tracking error signal. A micro-tracking control unit that controls the micro-tracking unit; and a control unit that controls the micro-tracking control unit based on the count value. The control unit records the light beam spot in a first recording mode. When moving from a track to a second recording track, the tracking Based on the time interval of the zero-crossing in the error signal, the light beam to the servo controls the movement speed of the spot, apparatus using an optical recording medium characterized. 32. Carriage means for moving a light beam spot on a plurality of recording tracks formed on a recording medium in a radial direction of the recording medium, and the recording medium between the light beam spot and the recording tracks. A tracking error signal generating unit that generates a tracking error signal representing a radial deviation of, a track counting unit that counts a value of a number of the light beam spots traversing the recording track based on the tracking error signal, A carriage control unit that controls the carriage unit; and a control unit that controls the carriage control unit based on the count value. The control unit moves the light beam spot from a first recording track to a second At the time of zero crossing in the tracking error signal when moving to the recording track of Based on the distance, the light beam to the servo controls the movement speed of the spot, apparatus using an optical recording medium characterized.