JPH05182208A - Method and device for stabilizing transfer of optical head device - Google Patents

Abstract

(57) [Abstract] [PROBLEMS] To provide a method and apparatus for stabilizing a conveyance for stabilizing the conveyance control of an optical head device. An optical head device 12 for reading information from a disk storage medium 17, a driving means 18 for driving the optical head device 12 to convey along optical guides, and a change in load of the optical head device 12 during conveyance. Load fluctuation detection means 36, 38, 26 for detection, a storage means 21 for storing the fluctuation data of the detected load, and a correction control in which predetermined control data stored in advance is corrected based on the load fluctuation data. The calculation means 20 for calculating data and the optical head device 1 based on the correction control data at the time of reading information from the disk storage medium 17 by the optical head device 12.
And a control means 20 for controlling the conveyance of No. 2. [Effect] It is possible to realize the transport control close to the expected one,
It is possible to prevent the reading performance from being deteriorated by the optical head device.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and a device for stabilizing a conveyance of an optical head device used for a drive device of a disk storage medium such as an optical disk and a magneto-optical disk, for reading information stored in the disk storage medium.

[0002]

2. Description of the Related Art As a conventional optical head device, for example, there is one shown in FIG. In the figure, reference numeral 1
Reference numeral 1 is an optical head for reading information from a disk storage medium (not shown), 12 is a head carrier on which the optical head 11 is mounted and which has an optical system unit inside, and 13 is a guide for conveying the head carrier 12. The guide shaft 15 is a flexible cable used to supply a current or the like to a circuit (not shown) of the optical system unit. The head carrier 12 is driven by a driving unit (not shown) so as to reciprocate between the movable ranges L, and reads information stored in the disk storage medium.

FIG. 9 is a circuit diagram showing a control system of the conventional optical head device. In the figure, reference numeral 17 is a disk storage medium such as an optical disk, and 18 is a head carrier 12.
A motor (M), 20 for driving the C controls the entire device based on a control program stored in the memory 21
PU, 23 is a CPU bus used for exchanging signals between the CPU 20 and the memory 21, 24 is a decoder for converting a signal from the CPU 20 into a format suitable for an external device, 26
Is an A / D converter that converts an analog signal into a digital signal, and 27 is a D / D converter that converts a digital signal into an analog signal
A converter, 28 is an analog switch, and 30 is an amplifier.

In FIG. 9, the CPU 20 includes a decoder 24.
To turn on the D / A converter 27 to turn on the D / A converter 27.
Outputs a signal to the motor 18 via the amplifier 30, the motor 18 controls the optical carrier to carry the head carrier 12 in the radial direction of the disk storage medium 17, and the optical head reads the stored information of the disk storage medium 17. It The CPU 20 of the head carrier 12 is a decoder 24.
By turning on (connecting) the analog switch 28, the optical system unit outputs a focus servo or track servo signal to the CPU 20 via the A / D converter 26 and the CPU bus 23.

[0005]

However, in such a conventional transporting device for the optical head device, the load at the time of deformation of the flexible cable 15 and the rotation of the shaft 12a rolling on the guide shaft 13 are supported. Even if the transfer of the head carrier 12 is controlled according to the predetermined transfer control data, the load during the transfer of the head carrier 12 varies due to the performance of the bearings, the deposits on the guide shaft 13, the wear of the guide shaft 13, and the like. Since the transport control as described above cannot be realized, the reading performance of the optical head 11 may deteriorate. In order to solve this, it is conceivable to increase the drive current of the motor 18, but mechanical resonance of the optical head 11 is caused, control becomes impossible, and the detection accuracy of various sensors deteriorates. It is not possible to simply increase the drive current of the motor 18 because of the fear of increasing the cost of the device or increasing the size of the device. Then, this invention makes it a subject to solve the said problem.

[0006]

In order to solve the above problems, the present invention has the following configuration. (1) The optical head device is transported to detect a load variation during the transport, the detected load variation data is stored in a memory, and predetermined transport control data stored in a memory in advance is used as the load. The correction control data corrected based on the variation data is calculated, and the conveyance of the optical head device is controlled based on the correction control data when the optical head device reads the information of the disk storage medium. A method for stabilizing conveyance of an optical head device. (2) An optical head device for reading information from a disk storage medium, a driving means for driving the optical head device to convey along guide means, and a load for detecting a change in load of the optical head device during conveyance. Variation detecting means, storage means for storing the detected load variation data, and computing means for computing corrected control data obtained by correcting predetermined control data stored in the predictive memory based on the load variation data. And a control unit that controls the driving unit based on the correction control data when the optical head unit reads information from a disk storage medium.

[0007]

According to the method and apparatus for stabilizing the transport of the optical head device having such a configuration, the optical head device is transported, the load variation during the transport is detected, and the detected load variation data is stored in the memory. Then, the correction control data obtained by correcting the predetermined transport control data stored in the preliminary memory on the basis of the load fluctuation data is calculated, and the correction control is performed during the operation of reading the information of the disk storage medium by the optical head device. By controlling the conveyance of the optical head device based on the data, it is possible to realize the conveyance control close to the expected one, and prevent the reading performance of the optical head device from deteriorating.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing a method for stabilizing conveyance of an optical head device according to claim 1 of the present invention. That is, in step 31, the optical head device is transported to detect the load variation during the transport, the load variation data detected in step 32 is stored in the memory, and in step 33 it is stored in the prediction memory. The correction control data obtained by correcting the predetermined transport control data based on the load variation data is calculated, and in step 34, the transport of the optical head device is controlled based on the correction control data during the reading operation by the optical head device. To do.

FIG. 2 is a functional block diagram showing a conveyance stabilizing device of an optical head device according to a second aspect of the present invention.
In the figure, reference numeral 41 is an optical head device for reading information from a disk storage medium, and 42 is an optical head device 4.
Reference numeral 1 denotes a drive means for driving the conveyance along a guide means such as a guide shaft, 43 denotes a load fluctuation detecting means for detecting a fluctuation in the load of the optical head device 41 during the conveyance, and 44 denotes a load detected by the load fluctuation detecting means 43 Storage means for storing the fluctuation data of the above, 45 is a calculation means for calculating the corrected control data obtained by correcting the predetermined control data stored in the predictive memory based on the fluctuation data of the load, and 46 is the optical head device. Driving means 4 for driving the conveyance of the optical head device 41 on the basis of the correction control data at the time of the reading operation by 41.
It is a control means for controlling 2.

3 to 7 are views showing an embodiment of a method and apparatus for stabilizing the conveyance of an optical head device according to the present invention. Figure 3
9 is a circuit diagram showing a control system of the optical head device 41, and the same parts as those in FIG. 9 showing a conventional example are designated by the same reference numerals. In FIG. 3, reference numeral 12 is a head carrier having an optical head (corresponding to the optical head device 41), 17 is a disk storage medium, 18 is a motor (corresponding to the driving means 42), 20 is a CPU (the calculating means 45,
21 corresponds to a memory (corresponding to the above-mentioned storage means 44), 23 corresponds to a CPU bus, 24 indicates a decoder, 2
Reference numeral 6 is an A / D converter, 27 is a D / A converter, 28 is an analog switch, and 30 is an amplifier.

In FIG. 3, the input terminal of the comparator 36 is connected to the circuit between the motor 18 and the amplifier 30, and the output terminal of the comparator 36 is the analog switch 38.
It is connected to the A / D converter 26 via. The analog switch 38 is O when the analog switch 28 is ON.
When the analog switch 28 is OFF, the analog switch 38 operates so as to be ON. The comparator 36, the analog switch 38 and the A / D converter 26 as a whole correspond to the load fluctuation detecting means 43. That is, the current value output from the amplifier 30 to the motor 18 changes according to the load fluctuation when the head carrier 12 is driven by the motor 18, and the comparator 36 compares the fluctuation of the current value with a predetermined value. The load variation during transportation of the head carrier 12 is detected, and the output signal is output to the CPU 20 via the analog switch 38, the A / D converter 26, and the CPU bus 23.

Next, the operation of the transport stabilizing device of the optical head device will be described with reference to FIGS. First, in FIG. 4, after the loading of the disk storage medium 17 is completed (step S1), the head carrier 12 is first moved to the innermost circumference of the disk storage medium 17 (step S2). Next, it is determined whether the position of the head carrier 12 is the outermost circumference (step S
3) If NO, the comparator 36 measures (detects) the current value output from the amplifier 30 to the motor 18 while the head carrier 12 moves at equal intervals (step S4). Next, it is judged whether or not the data of the detected current value is within the allowable value (step S5), and when the data is within the allowable value, the CPU 20 determines the current value corresponding to the detection position of the head carrier 12 at that time. It is stored in the memory 21 (step S6). Next, returning to step S3 again, it is judged whether or not the position at that time is the outermost circumference, and if NO, the operation from step S4 to S6 is repeated again.

In this way, the drive current value of the motor 18 is measured while moving the head carrier 12 in the radial direction of the disk storage medium 17 from the innermost circumference to the outermost circumference, and the data is stored in the memory 21. Remember. If this data is made into a graph (line diagram), it becomes as shown in FIG. 5, for example. If YES in step S3 (when the head carrier 12 reaches the outermost circumference of the disk storage medium 17), this series of detection / storage operations ends (step S7). If NO in step S5 (when the detected data is out of the allowable value), it is determined that the error is caused by a device failure or the like, and the process proceeds to the error processing routine (step S8).

When the detecting / storing operation is completed in this way, the process proceeds to step 33 in FIG. That is, in this step 33, predetermined transport control data preliminarily stored in the memory 21, for example, speed data of the head carrier 12 as shown in FIG. 6 is set based on load variation data as shown in FIG. CP corrected correction control data
U20 calculates and temporarily stores this correction control data in the memory 21. Such correction control data is correction speed data such as that shown in FIG. 7, which is a combination of the data shown in FIG. 5 and the data shown in FIG.

When the correction control data is calculated in this way, the process proceeds to step 34 in FIG. In step 34, the CPU 20 controls the motor 18 via the CPU bus 23, the decoder 24, the D / A converter 27, and the amplifier 30 based on the correction control data temporarily stored in the memory 21. Therefore, the head carrier 1
Since the motor 18 is controlled by the current value corrected so that a large current is applied to a place with a large load and a small current is applied to a place with a small load during the conveyance of No. 2, the prediction as shown in FIG. The transport control close to the expected one can be realized. Therefore, the disk storage medium 17 formed by the optical head
It is possible to prevent the deterioration of the information reading performance.

In the above embodiment, the reading operation of the disk storage medium 17 by the optical head has been mainly described, but it goes without saying that the same effect can be expected in the performance of the writing operation.

[0017]

As described above, according to the present invention, the optical head device is transported to detect the load variation during the transport, and the detected load variation data is stored in the memory to predict the load variation. The predetermined transport control data stored in the memory is corrected based on the load variation data to calculate correction control data, and when the optical head device reads information on the disk storage medium, the correction control data is calculated based on the correction control data. By controlling the conveyance of the optical head device, it is possible to realize the conveyance control close to the expected one, and prevent the reading performance of the optical head device from deteriorating. Similarly, the deterioration of the writing performance can be prevented. Further, according to the present invention, since the current value supplied to the motor 18 is not simply increased, it is possible to prevent the resonance of the optical head, the deterioration of the detection accuracy of various sensors, or the increase in cost and size of the apparatus. can do. In addition, it is possible to prevent deterioration of reading performance due to aging, and to have a diagnostic function such as finding a failure. Furthermore, since optimum transport control can always be realized, it is possible to prevent a decrease in data processing speed.

[Brief description of drawings]

FIG. 1 is a block diagram showing a method for stabilizing conveyance of an optical head device according to claim 1 of the present invention.

FIG. 2 is a functional block diagram showing a conveyance stabilizing device of an optical head device according to a second aspect of the present invention.

FIG. 3 is a circuit diagram of a control system showing an embodiment of a conveyance stabilizing device for an optical head device according to the present invention.

FIG. 4 is a flowchart showing a part of an operation procedure of the conveyance stabilizing device of the optical head device shown in FIG.

FIG. 5 is a diagram showing load variation data at each position of the optical head.

FIG. 6 is a diagram of predetermined transport control data indicating the speed at each position of the optical head.

7 is a diagram showing correction control data obtained by correcting the transfer control data shown in FIG. 6 based on load variation data shown in FIG.

FIG. 8 is a perspective view showing a conventional optical head device.

9 is a circuit diagram showing a control system of the optical head device shown in FIG.

[Explanation of symbols]

 12 head carrier 17 disk storage medium 18 motor 20 CPU 21 memory 23 CPU bus 24 decoder 26 A / D converter 27 D / A converter 28, 38 analog switch 30 amplifier 36 comparator 41 optical head device 42 driving means 43 load fluctuation Detecting means 44 Storage means 45 Computing means 46 Control means

Claims (2)

[Claims] 1. An optical head device is transported to detect a load variation during the transport, the detected load variation data is stored in a memory, and predetermined transport control data stored in a memory is stored in advance. Correction control data corrected on the basis of the load variation data is calculated, and the conveyance of the optical head device is controlled based on the correction control data when the optical head device reads information on the disk storage medium. And a method for stabilizing conveyance of an optical head device. 2. An optical head device for reading information from a disk storage medium, a drive means for driving the optical head device to carry along guide means, and a fluctuation in load of the optical head device during carrying. Load fluctuation detection means, storage means for storing the detected load fluctuation data, and predetermined control data stored in the predictive memory for correction control data corrected based on the load fluctuation data. An apparatus for stabilizing conveyance of an optical head device, comprising: computing means; and control means for controlling the driving means based on the correction control data when the optical head device reads information from a disk storage medium.