JPS59172172A - Device for handling storage medium - Google Patents

Abstract

PURPOSE:To improve the reliability of accessing, by moving an optical beam irradiating position to readable position when position information on a storage medium cannot be read at the time of accessing. CONSTITUTION:An optical head 3 is linearly moved on the track of an optical disk 1 rotated and driven by a motor 2 in radial directions. A control circuit 29 reads the content of a track No. register 16 and calculates the difference of an accessing track No. and the read track No. When the difference is less than a prescribed track number and the track No. cannot be read, the control circuit 29 reads a scale No. in a linear motor driving circuit 8 and calculates the difference of the scale No. and another scale No. corresponding to a track No. to be accessed. When the difference exceeds a prescribed range, the control circuit 29 moves a linear motor 4 by a distance equal to the scale value. When a track No. cannot be read, the controlling circuit judges that the optical head 3 is accessed to an unrecorded part and makes the linear motor driving circuit 8 move the linear motor 4 inward to make seek motion.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a storage medium handling device such as a disk device that stores or reproduces information on an optical disk in which information is stored in a spiral or concentric form. The button is related.

[Technical background of the invention]

In recent years, image information such as documents, which are generated in large quantities, is photoelectrically converted by two-dimensional light scanning, and this photoelectrically converted image information is stored in an image storage device, or it can be searched and reproduced as needed. However, recently, optical disk devices have been used as image storage devices in image information file devices that can reproduce and output as bar copies or soft copies.

Conventionally, such optical disk devices have used an optical disk that stores information in a spiral or concentric form, and an optical head that moves linearly from the innermost circumference in the radial direction of the optical disk using a linear motor. , 9) Do not remember the rack number.

Information stored on the optical head or information on the optical head is reproduced.

[Problems with background technology]

However, in the above-described device, data is recorded while recording the track number from the inside of the optical disc, and track access is performed by accessing several tracks in one go.
It is designed to be carried out using a scale that is stored in memory. Therefore, since the track access is rough access, there is a problem in that the optical head may move to a position where no track number is recorded during the access. For this reason, access may not be possible, which poses a problem in actual use.

[Purpose of the invention]

This invention was made in view of the above circumstances, and its purpose is to store the location information of the irradiation position of one light beam when accessing a location where no location information is stored. The object of the present invention is to provide a storage medium handling device that can be moved to any position and can be actually used.

[Summary of the invention]

In this invention, when the positional information on the storage medium cannot be read during access, the light beam irradiation position is moved to a position where it can be read.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows a schematic configuration of a storage medium handling device, such as an optical disk device. That is, an optical disk (storage medium) 1 has a spiral information storage section with a constant pitch in the radial direction, and is rotationally driven by a motor 2. As shown in FIG. 2, the optical disc 1 has a donut-shaped coating layer of a recording material such as tellurium or bismuth coated on the surface of a circular substrate made of glass or plastic. There is a notch near the center of the material coating layer and a reference position mark 1! is provided.

Further, each round on the optical disk 1 is called a track, and each track is assigned a track number (position information), and each track is assigned a 32-digit number of "θ~31" with the basic position mark 11 as "0". It is divided into sectors.

Reading and writing of data onto the optical disc 1 is performed by an optical head (position information reading means) 3. This optical head 3 has a movable part 5 of a DC linear motor (light beam irradiation position moving means) 4 which is composed of a movable part and a fixed part.
The optical disc 1 is fixed to the optical disc 1 and is moved by the movement of the movable part 5.
0 The radial direction of the finger is linearly moved in the A and B directions. 6 is an optical scale fixed to the movable part 5; 7 is a detector (position detector) for detecting the position of the optical scale 6; Two types of detection signals having different phases (this phase relationship changes depending on the direction) are output depending on the amount of movement of the head 3).

On the other hand, the optical head 3 fixed to the linear motor 4 includes a radar diode, a collimator lens, a beam sinter, an objective lens, a focus drive coil that drives the objective lens in the direction of the optical disk, and a tracking drive that drives the objective lens in the radial direction of the optical disk. It consists of a focusing detector having a pair of photodetectors that detects whether the laser beam is focused on the coil, an optical disk, and a tracking detector having a pair of photodetectors that detects whether the laser beam is tracking on an information track. has been done. A detection signal is output from each photodetector to a signal circuit, and each drive circuit outputs a detection signal to each drive coil and radar diode 6.
Power is applied to the first board.

The IJ near motor drive circuit 8 is a control circuit 29 which will be described later.
The linear motor 4 is driven according to a target position signal supplied from the detector 2, an output signal from the detector 2, and eccentricity correction data supplied from a D/A converter 25, which will be described later.

The track number insertion circuit 9 inserts a track number in a track number register 16, which will be described later, into recording input data from an external device (not shown) and outputs the same. The modulation circuit 10 converts the data from the track number insertion circuit 9 into Ml.
The signal is output after i''M modulation. The Rade drive circuit 11 drives and controls the Rade oscillator in the optical head 3 in accordance with the output signal supplied from the modulation circuit 10.

On the other hand, the rotary motor drive circuit 12 determines the speed according to the rotation clock from the motor 2, and controls the speed to a set speed from a control circuit 29, which will be described later. The reference position mark 1 of the optical disc 10 is detected by the detector 13, and this detection signal is binarized by the binarization circuit 14 and then sent to the sector number counter 15 and the track number register 1.
6. The sector number counter 15 counts the number of sectors by counting the rotation clock from the motor 2 every time a signal is supplied from the binarization circuit 14. The track number register 16 stores a track number from a track number discrimination circuit 28, which will be described later, each time a signal from the binarization circuit 14 is supplied.

Further, the focus serve drive circuit 17 adjusts the focus of the movable lens in the optical head 3 according to the detection signal from the detector in the optical head 3), and the focus pull-in circuit 18 performs focusing. h
Focusing is performed accurately when changing from a non-active state to a working state. A tracking team driving circuit 19 drives a movable lens in response to a detection signal from a detector in the optical head 3 so that a beam of light emitted through a movable lens (objective lens) in the optical head 3 is centered on the track. It moves the optical disc in the radial direction. In addition, the tracking zigzag drive circuit 19 temporarily stops the servo operation and emits a track zoyande drive pulse in response to the track jump and f lass from the tracking zoyamp pulse generation circuit 2o to move the objective lens one track. It is capable of moving separate beams of light. The pit signal envelope detection circuit 21 and the pit signal envelope binarization circuit 22 perform envelope detection on the detection signal from the photodetector of the optical head 3 and then binarize it, thereby converting it into a beam of light. This is to detect whether the area being read is an area on the optical disc 1 where pits are generated.

On the other hand, the eccentricity detection circuit 23 detects the eccentricity of the optical disk 1 according to the detection signal from the photodetector in the optical head 3, and the eccentricity data is stored in the eccentricity storage circuit 2.
4 is stored. The eccentricity data (correction data) in the eccentricity storage circuit 24 is converted into an analog signal by a D/A converter 259-, and is supplied to the linear motor drive circuit 8. Further, the pit signal binarization circuit 26 binarizes the detection signal from the photodetector in the optical head 3. The demodulation circuit 27 demodulates the MFM modulated output of the pit signal binarization circuit 26. The track number discrimination circuit 28 distinguishes the data demodulated by the demodulation circuit 22 into image information and track numbers.The track number is supplied to the track number register 16, and the image information is output as playback output data. It is now possible to do so. The control circuit 29 controls each of the above sections. Above control circuit 2
9 monitors time using a timer 30.

Next, in such a configuration, FIG. 3(a).

The operation will be explained with reference to the flowchart shown in FIG. 4(b) and FIG. For example, a target track number and sector number are now supplied to the control circuit 29io- from an external device (not shown), such as a host computer. Then, the control circuit 29 reads the contents of the track number register 16, determines whether the track number has been read, and, if the track number has been read, calculates the difference between the track number to be accessed and the read track number. When the difference is within 70 tracks, or when it is determined that the track number cannot be read, the control circuit 29
Read the scale number in the linear motor drive circuit 8,
Calculate the difference between the track number to be accessed and the corresponding scale number. When this difference is not within the "4" scale, and when the difference in track numbers is more than "70" tracks, the control circuit 29 causes the linear motor drive circuit 8 to move the linear motor 4 by the scale value.

When the scale access is completed, the control circuit 29 reads the contents of the track number register 16 and determines whether the track number has been read. If the track number cannot be read, the control circuit 29 determines that the optical head 3 has accessed an unrecorded area, and causes the linear motor drive circuit 8 to cause the linear motor 4 to seek inward. At this time, the control circuit 29 starts the timer 30. Next, the control circuit 29 judges whether the scale number from the linear motor drive circuit 8 is also inside the scale number of the innermost track, and if it is inside, the linear motor 4
Make the seek operation to the outside. Then, before the timer 30 times out, the track number is stored in the track number register 16, and when the control circuit 29 reads it, the timer 30 determines whether a predetermined time or more has elapsed, and if it has elapsed, a seek operation is performed. A flag is set to request pitch recalculation, and when the seek operation is within a predetermined time, the seek operation is stopped. Note that when the timer 30 times out, the control circuit 29 notifies you of an error.

In this way, when an access to a predetermined track is read, or when a track number is read in the first scale access, the control circuit 29 calculates the difference between the track number at the position to be accessed and the read track number. calculate.

When the difference is greater than 70 tracks, the control circuit 29 sets a flag requesting pitch recalculation, calculates the scale number difference from the track number difference, and corrects the scale position to be accessed. Accordingly, the control circuit 29 causes the linear motor drive circuit 8 to move the linear motor 4 by the scale value. After accessing the track number, the process starts by determining whether the track number can be read again.

Further, when the difference between the track number of the position to be accessed and the read track number is between 20 tracks and 70), the eccentricity is output from the eccentricity storage circuit 24, and the tracking servo drive circuit 19 is turned off. The tracking team will no longer do this. Next, control circuit 2
Reference numeral 9 indicates the track number difference, and a linear motor drive circuit 8 causes the linear motor 4 to perform a seek operation. Thereafter, upon completion of the access, the control circuit 29 reads the contents of the track number register 16 and determines whether the track number has been read. If the track number is read, the control circuit 29 calculates the difference between the track number of the position to be accessed and the read track number. Then, when the difference is within 20 tracks, and when the difference between the track number of the area to be accessed and the read track number is calculated,
When the difference is within 20 tracks, the control circuit 29 turns on the eccentricity storage circuit 24, and also turns on the tracking coefficient. The drive circuit 19 is turned on. When this button is pressed, the track difference and the tracking signal are used by the drive circuit 19 to cause the track jump/failure generation circuit 20 to generate the track current. Next, the control circuit 29 determines whether the track number of the track to which the trunk jump occurred, that is, the contents of the track number register 16, and the track number to be accessed match.
If they do not match, the difference between the track number to be accessed and the read track number is calculated, and the track jump is performed again as described in 14- above.

Furthermore, if it is determined that they match, it means that a normal access has been made.

〔Effect of the invention〕

As detailed above, according to the present invention, at the time of access,
It is possible to provide a storage medium handling device that can move the light beam irradiation position to a position where position information is stored when a place where position information is not stored is accessed and can be used in practice.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention; FIG. 1 is a diagram schematically showing the overall configuration, FIG. 2 is a plan view showing an optical disk, and FIGS. 3 and 4 are for explaining the operation. This is a flowchart. 1... Optical disk (storage medium), 3... Optical spatula r
(position information reading means), 4... linear motor beam irradiation position moving means), 5... optical scale, 7...
Detector, 8... Linear motor drive circuit, 16... Track number register, 26... Pit signal binarization circuit, 22... Demodulation circuit, 28... Track number discrimination circuit, 29...・Control circuit.

Claims (1)

[Claims] (1) A storage medium handling device that reads information on a storage medium by irradiating it with a light beam, which includes a plurality of tracks provided on the storage medium on which positional information is recorded, and irradiating the light beam onto these tracks. a light beam irradiation position moving means for moving the light beam irradiation position; a position information reading means for reading the position information recorded on the track from the light beam changed by irradiating the storage medium; and a movement control means for controlling the beam irradiation position movement means, and the movement control means operates the light beam irradiation position movement means when the position information reading hand dye cannot read the position information. A storage medium handling device characterized by moving an irradiation position to another track. '(2) When the position information reading means cannot read the position information, the movement control means detects the light beam irradiation position on the storage medium in the moving direction of the light beam irradiation position moving means, and moves the beam from a predetermined position. The light beam irradiation position moving means is operated to move the light beam irradiation position to the other side when the position is closer to one side, and the light beam irradiation position is activated to move the light beam irradiation position to one side when the position is closer to the other side than the predetermined position. Claim 1, characterized in that the beam irradiation position moving means is actuated.
The storage medium handling device described in Section 1.