JPH08315372A - Information recording/reproducing device - Google Patents

Abstract

PURPOSE: To make an information recording/reproducing device possible to perform fast-feeding by moving a pickup in the radial direction with a first moving means and moving the pickup in the direction opposite to the prescribed direction by a prescribed range with a second moving means. CONSTITUTION: A microcomputer 6 controls an RF amplifier 5, a signal processing LSI7, a servo LSI9, etc., and controls a spindle motor 3 and a slide motor 2 through a motor driving 8 for reading the target data. And in that case, it is possible to rotate and move the pickup by a prescribed range by controlling a pickup rotating motor 11 in the direction opposite to the rotating direction of the disk 1 by the microcomputer 6 in addition to that the pickup is moved linearly between inner/outer peripheries in the radial direction of the disk by the slide motor 2.

Description

Detailed Description of the Invention

[0001]

The present invention relates to a constant linear velocity (hereinafter,
The present invention relates to an information recording / reproducing apparatus that rotationally drives a magneto-optical disk by "CLV") to record / reproduce data.

[0002]

2. Description of the Related Art In an optical disk device, while rotating the disk, a focused laser spot is irradiated along a track formed as a pit row of data on the optical disk to detect a change in intensity of reflected light and a polarization component. The pickup is used to reproduce the information recorded on the optical disc. That is, by rotating the disc, the optical pickup is relatively scanned in the track direction at the disc rotation speed to reproduce information.

Further, the data pits are formed with the same recording density as the inner circumference over the entire surface of the disk in order to achieve large-capacity recording on a disk as small as possible, and the disk rotation speed is constant linear velocity (CLV). Has been done,
The read data amount is determined by this linear velocity.

In recent years, in a CD-ROM or the like, the rotational speed of the disk is increased and the linear speed is doubled or quadrupled to improve the transfer rate of the drive and shorten the access time.

FIG. 7 is a schematic block diagram showing the structure of a conventional information recording / reproducing apparatus, and is a block diagram of a disk servo system for reproducing MD (Mini Disc) data. In the figure, the disk 1 is a spindle motor 3
Is controlled by the CLV servo.

The pickup 4 is controlled by the slide motor 2 to move linearly between the inner and outer circumferences in the radial direction of the disc to read the target data on the disc 1.
The read data passes through the RF amplifier 5 and undergoes signal processing L
It is processed by SI7 and output.

Microcomputer (hereinafter "microcomputer")
6) controls the RF amplifier 5, the signal processing LSI 7, the servo LSI 9 and the like to read the target data, and the spindle motor 3 and the slide motor 2 are controlled via the motor driver 8.

Further, the tracking and focus actuator (not shown) of the pickup 4 is controlled via an actuator driver 10.

[0009]

However, in the case of MD data, if the normal reproduction is performed as described above, since the data is configured including linking (invalid sector), the data is continuously written. In the case of reading, there is a problem that a rotation waiting time is always generated because this unnecessary part is also read, which hinders shortening of access time.

The present invention has been made in view of the above problems, and an object thereof is to provide an information recording / reproducing apparatus which eliminates the rotation waiting time, shortens the access time and improves the data transfer rate. To do.

[0011]

In order to achieve the above object, the information recording / reproducing apparatus of the present invention is, in claim 1, a pickup for reproducing information from an optically reproducible disc and a diameter of the pickup. A first moving means for moving the disc in a predetermined direction, a motor for rotating the disc in a predetermined direction, and a second moving means for moving the pickup in a direction opposite to the predetermined direction by a predetermined range. Be prepared.

Further, according to a second aspect of the present invention, the second moving means fast-forwards the pickup to a position where the target data exists when reading data from the disk continuously. .

Further, in claim 3, the predetermined range is
It is characterized in that it is within one lap and is an invalid sector such as a linking portion.

According to a fourth aspect of the present invention, the second moving means returns to a predetermined position at the start and end of the operation of the apparatus.

[0015]

With the above structure, in the first aspect, the pickup reproduces information from the optically reproducible disc,
The first moving means moves the pickup in the radial direction, the motor rotates the disk in a predetermined direction, and the second moving means moves the pickup in a predetermined range in a direction opposite to the predetermined direction. Since it is moved only by this, fast-forwarding can be performed, the rotation waiting time can be shortened, and the data transfer rate can be improved.

Further, in claim 2, the second moving means is
When the data is continuously read from the disc, the pickup is fast-forwarded to the position where the target data exists, so that the fast-forwarding can be performed, the rotation waiting time can be shortened, and the data transfer rate can be improved. .

Further, in claim 3, the predetermined range is
Since it is within one lap and is an invalid sector such as a linking portion, fast-forwarding can be performed, the rotation waiting time can be shortened, and the data transfer rate can be improved.

Further, in claim 4, the second moving means returns to a predetermined position at the time of starting and ending the operation of the apparatus, so that even if the pickup is fast forwarded as in claims 1 to 3, it is always in the initial position. It will return to the state.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The structure and operation of an information recording / reproducing apparatus of the present invention will be described below with reference to the drawings. Figure 1
1 is a block schematic diagram showing a configuration of an information recording / reproducing apparatus in an embodiment of the present invention. In the figure, the disk 1, the slide motor 2, the spindle motor 3, the pickup 4, the RF amplifier 5, the microcomputer 6, the signal processing LSI 7, the servo LSI 9, and the actuator driver 10 are the same as those in the conventional example, and detailed description thereof is omitted. To do.
Reference numeral 11 is a pickup rotation motor, and 12 is a motor driver.

The operation of the information recording / reproducing apparatus of the present invention configured as described above will be described below. As in the conventional example of FIG. 7, the disk 1 is controlled by the spindle motor 3 by a CLV servo section (not shown) in the servo LSI 9. The pickup 4 is a slide motor 2
Is controlled so that the target data on the disk 1 is read by linearly moving between the inner and outer circumferences in the radial direction of the disk.

The read data passes through the RF amplifier 5 and is processed and output by the signal processing LSI 7. The microcomputer 6 uses the RF amplifier 5, in order to read the target data.
The signal processing LSI 7, the servo LSI 9, and the like are controlled, and the spindle motor 3 and the slide motor 2 are controlled via the motor driver 8. Further, the tracking and focus actuators of the pickup 4 are controlled via the actuator driver 10.

In this embodiment, in addition to moving the pickup linearly between the inner and outer circumferences in the radial direction of the disk by the slide motor 2, the pickup 6 is moved by the microcomputer 6 via the motor driver 12. , The rotation direction of the disc 1 is opposite to that of the pickup rotation motor 1
By controlling 1, the pickup 4 can be rotationally moved within a predetermined range.

FIG. 2 shows the movement range and direction of the pickup, and b is the movement range and direction of the conventional pickup 4. In addition to this, the spindle motor 3 causes the disk 1 to move in the direction of the arrow a. If it is spinning,
The pickup rotation motor 11 can rotate and move in the direction of the arrow c within a predetermined range.

A case where this servo mechanism is used for the purpose of improving the transfer rate in the case of continuously reading data will be described below by taking MD data as an example. MD data is a "cluster" consisting of 32 sectors as shown in FIG.
The clusters are linked by a linking sector.

The access time is generally the seek time and the rotation waiting time added together. FIG. 4 shows the operation of the pickup 4 at the time of access, and the seek time is d.
It is the time when the pickup 4 jumps from the point to the point e while crossing the track 13 at high speed. The rotation waiting time is the time during which the pickup 4 rotates from the point e to the point f while reading the data to the target cluster.

This seek time is a time that can be predicted to some extent, but the rotation waiting time cannot be predicted because it is not known whether it is immediately before the target cluster or one lap before the target cluster depending on the landing position of the seek. That is, when the target cluster is N, if it is the cluster N−1 in FIG. 3, it is immediately before, and if it is the cluster N + 1, the pickup 4 is set to 1
It is necessary to jump to the front (inner circumferential side) track, and then wait until the disk 1 rotates and reaches the cluster N.

In the present application, the pickup 4 is fast-forwarded by rotating the pickup 4 in the direction c opposite to the disc rotation direction a by the pickup rotation motor 11 shown in FIG. Since the amount of fast-forwarding varies depending on the position of the disc, the microcomputer 6 has a table calculated in advance, and the microcomputer 6 controls the pickup rotation motor 11 via the motor driver 12.

When the pickup 4 is rotated in the direction opposite to the rotation direction of the disk 1 for the purpose of improving the data transfer rate and shortening the access time, the slide motor 2 and the control lines and signal lines of the pickup 4 are involved. , It may cause disconnection.

Therefore, as a method for solving this problem, first, immediately before continuous reading of data or immediately before an access operation, the pickup rotation motor 11 is rotated in the same direction as the rotation direction of the disk to return to the original position. Prevent by returning to. The original position may be detected by newly providing a detection switch (not shown) in the mechanism of FIG. 2, for example.

However, at the time of access operation, the pickup 4 only needs to make one round at the maximum, but at the time of fast-forwarding of the linking portion during continuous reading of data, the pickup 4 needs to rotate to some extent during continuous reading. There is
You will get caught in the wire.

Therefore, as a second method, at the time of fast-forwarding of linking at the time of continuous reading of data or after the end of the access operation,
By gradually rotating the pickup rotation motor 11 in the same direction as the rotation direction of the disc 1 and returning it to the original position, the winding breakage of the wire is prevented.

At this time, since the rotation of the disk has to be CLV, it is necessary to be slightly higher than the normal rotation speed. The rotation speed of this returning operation is sufficiently followed by the CLV servo and the data At the time of continuous reading, it is necessary to return to the original before the next linking section comes, so it is necessary to set an appropriate rotation speed.

Further, as a third method, as shown in FIG.
I will explain how to turn by. In this case, the pickup 4, the slide motor 2, the circuit board 20, and the spindle motor 3 are also fixed by the fixing columns 22, and are all integrated.

The pickup rotation motor 11 fixed to the cabinet 21 rotates the servo unit in the direction opposite to the rotation direction of the disk 1,
The object of the present application can be achieved.

However, the control circuit such as the microcomputer 6 is on the circuit board 20, and a line for controlling the pickup rotation motor 11 is required. To prevent wire breakage and breakage, see Fig. 5 and Fig. 6. A ring-shaped copper pattern 24 is provided on the circuit board 20, and an elastic pin contact 23 is brought into contact with the pickup rotation motor 11 to achieve conduction. As a result, even if the servo unit rotates,
The circuit board 20 and the pick-up rotation motor can be kept in contact with each other without any wire winding breakage.

In the above embodiment, the slide motor 2 corresponds to the first moving means in claim 1,
The spindle motor 3 corresponds to the motor, and the pickup rotation motor 11 corresponds to the second moving means.

[0037]

As described above, in the information recording / reproducing apparatus of the present invention, in the first aspect, the pickup reproduces information from the optically reproducible disc, and the first moving means moves the pickup in the radial direction. And the motor rotates the disk in a predetermined direction, and the second moving means moves the pickup in a direction opposite to the predetermined direction by a predetermined range, so that fast-forwarding can be performed. The effects of shortening the waiting time and improving the data transfer rate are obtained.

Further, in claim 2, the second moving means is
When data is continuously read from the disc, the pickup is fast-forwarded to the position where the target data exists, so that fast-forwarding can be performed, and rotation waiting time can be shortened and the data transfer rate can be improved. can get.

In the third aspect, the predetermined range is
Since it is within one lap and is an invalid sector such as a linking portion, fast-forwarding can be performed, and rotation waiting time can be shortened and the data transfer rate can be improved.

Further, in claim 4, the second moving means returns to a predetermined position at the start and end of the operation of the apparatus. Therefore, even if the pickup is fast-forwarded as in claims 1 to 3, it is always in the initial position. The effect of returning to the state and preventing the disconnection due to the winding of the wire is obtained.

[Brief description of drawings]

FIG. 1 is a block schematic diagram showing a configuration of an information recording / reproducing apparatus in an embodiment of the present invention.

FIG. 2 is a diagram showing a movement range of a pickup in the embodiment.

FIG. 3 is a diagram showing a data structure in the example.

FIG. 4 is a diagram showing an operation of a pickup at the time of access in the embodiment.

FIG. 5 is a diagram showing a configuration of a rotation mechanism of a servo unit in the embodiment.

FIG. 6 is a diagram showing a structure of a motor contact in the rotation mechanism of the servo unit in the embodiment.

FIG. 7 is a block schematic diagram showing a configuration of an information recording / reproducing apparatus in a conventional example of the present invention.

[Explanation of symbols]

 1 Disk 2 Slide Motor 3 Spindle Motor 4 Pickup 5 RF Amplifier 6 Microcomputer 7 Signal Processing LSI 9 Servo LSI 10 Actuator Driver 11 Pickup Rotation Motor

Claims (4)

[Claims] 1. A pickup for reproducing information from an optically reproducible disc, a first moving means for moving the pickup in a radial direction, a motor for rotating the disc in a predetermined direction, An information recording / reproducing apparatus comprising: a second moving unit that moves the pickup in a direction opposite to the predetermined direction by a predetermined range. 2. The information recording apparatus according to claim 1, wherein the second moving means fast-forwards the pickup to a position where target data exists when reading data from the disc continuously. Playback device. 3. The information recording / reproducing apparatus according to claim 1, wherein the predetermined range is within one turn and is an invalid sector such as a linking portion. 4. The information recording / reproducing apparatus according to claim 1, wherein the second moving means returns to a predetermined position at the start and end of the operation of the apparatus.