JP2004234766A - Disk drive - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a disk drive capable of controlling operations for unloading a disk tray and for loading the disk tray stably without necessitating a special mechanism even to unique load fluctuations and load fluctuations by time change and at a low cost. <P>SOLUTION: In this disk drive, time required for unloading a disk tray D1 and for loading the tray D1 are measured by a timer part 2 on the basis of a unloading completion detection signal 7 and a loading completion detection signal 6 from a detection part D2 and this measured time is compared with preliminarily assumed target time. The next output time of a driving voltage to be applied to a disk tray driving motor 1 is changed in accordance with the compared result and the voltage output time after the change is stored in an output storage part 4. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to, for example, a disk drive device that records / reproduces information on / from an optical disk and controls the unloading and loading operations of a disk tray holding the optical disk during recording / reproduction.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, for example, in a disk drive apparatus for recording / reproducing information on / from an optical disk, a disk tray control for driving and controlling a disk tray for holding the optical disk at the time of the recording / reproducing operation to carry out / in the disk tray. As a method, a control method using a device that performs stable disk tray control even when the elapsed time during unloading and loading of the disk tray becomes long (for example, see Patent Document 1), and a method during unloading and loading of the disk tray. There is a control method using a device that performs disk tray control so as to keep the moving speed at a constant speed (for example, see Patent Document 2).
[0003]
[Patent Document 1]
JP 2001-23273 A (Items 7-9)
[0004]
[Patent Document 2]
Japanese Patent Application Laid-Open No. 2001-216702 (Section 11-14)
[0005]
[Problems to be solved by the invention]
However, in the above-described conventional disk drive device, for example, in the control method using the device disclosed in Patent Document 1, when the disk tray does not operate for a certain period of time, the disk tray control method is changed in the middle, so that the disk tray can be unloaded and transferred. There is a problem that the carrying speed is changed and the user feels strange.
[0006]
On the other hand, it is necessary to always complete the carry-out and carry-in operations in a fixed time and perform stable control. Also, it is necessary to perform stable control with respect to load fluctuation due to aging.
[0007]
In addition, in the control method using the device of Patent Document 2, a special mechanism is used to detect the speed of unloading and loading of the disk tray in consideration of load variation when the disk tray slides and load fluctuation due to aging. However, there is a problem that the cost is required and the product cost is increased.
[0008]
On the other hand, in order to realize a low-priced disk drive, it is necessary to eliminate the use of a special mechanism in consideration of load variation when the disk tray slides and load fluctuation due to aging.
[0009]
SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional problems, and includes inherent load fluctuation such as variation in winding resistance of a motor and load variation when a disk tray slides during unloading and loading operations of a disk tray, and aging. Provided is a low-cost, low-cost disk drive capable of stably controlling the drive of a disk tray even when the load fluctuates over time.
[0010]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, a disk drive device according to claim 1 of the present invention comprises: a rotary drive motor for driving a drive target by a rotational force; and loading and unloading of a disk driven by the rotary drive motor. A tray for detecting the completion of unloading and loading of the disk tray, a timer unit for measuring the time required for the completion of unloading and loading based on a detection signal from the detecting unit, A storage unit for storing the determined time required for the unloading and loading, the control output to the rotary drive motor at the time of unloading and loading the disk, and a time required for the unloading completion and the loading completion measured by the timer unit. The control output to the rotary drive motor is adjusted only when the time deviates from a predetermined allowable range from the predetermined time required for unloading and loading. Characterized by being configured to include a dynamic controller.
[0011]
As described above, when the time required for unloading and loading deviates from a predetermined allowable range from the predetermined time required for unloading and loading, the control output to the rotary drive motor is adjusted, and the unloading and loading of the disk tray are performed. The time required for carrying in can be made constant.
[0012]
A disk drive according to a second aspect of the present invention is the disk drive according to the first aspect, wherein a control output from the drive control unit to the adjusted rotary drive motor is stored in the storage unit. It is characterized in that it is configured to store.
[0013]
As described above, by storing the adjusted control output for the rotary drive motor, the adjusted control output can be supplied as the control output to the rotary drive motor at the time of the next loading / unloading operation of the disk tray.
[0014]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, a disk drive device according to an embodiment of the present invention will be specifically described with reference to the drawings.
[0015]
FIG. 1 is a block diagram showing the configuration of the disk drive of the present embodiment. As shown in FIG. 1, the disk drive device of the present embodiment includes a disk tray D1 for holding, for example, an optical disk as a target medium during recording or reproduction, a disk tray drive motor 1 for driving the disk tray D1, and a disk drive D1. A detection unit D2 for detecting the completion of unloading and loading of the disk tray D1, and a detection signal 7 and a detection signal 6 of loading completion of the disk tray D1 from the detection unit D2. A timer unit 2 for measuring a required time, an arithmetic processing unit 3 for determining a drive voltage as a control output for the disk tray drive motor 1 based on the measured time obtained by the timer unit 2, and an arithmetic processing unit 3. An output storage unit 4 for storing the determined drive voltage as control output data, and a control output to the disk tray drive motor 1 And, and a motor drive control unit 5 for controlling the driving voltage.
[0016]
FIG. 2 is a control voltage output waveform diagram showing a disk tray drive operation in the disk drive device of the present embodiment, and shows a control voltage output signal to the disk tray drive motor 1. Here, the adjustment of the time required for unloading and loading the disk tray D1 is performed by keeping the motor voltage V and the control voltage cycle T1 constant and changing the control voltage output time T2. By changing the control voltage output time T2 in this manner, the ratio of the drive voltage application time to the disk tray drive motor 1 to the control voltage cycle T1 is changed.
[0017]
When the disc tray D1 is carried out and carried in, it is assumed that the drive voltage is continuously output as a control output to the disc tray drive motor 1 at a control voltage cycle T1.
[0018]
FIG. 3 is a flowchart showing a disk tray driving operation in the disk drive device of the present embodiment. Referring to FIGS. 1 and 2 according to FIG. 3, unloading is performed as an example of the operation of the disk drive device of the present embodiment. The control procedure at the time will be described.
[0019]
First, at the start of unloading of the disk tray (step S1), the control processing unit 3 reads out the control voltage output time T2 during the unloading control of the disk tray from the output storage unit 4 (step S2). Output of the control voltage to the tray drive motor 1 is started.
[0020]
At this time, the timer unit 2 starts measuring the time required for unloading the disk tray D1 (step S3). The timer unit 2 measures the time until the unloading completion detection signal 7 indicating the completion of unloading of the disk tray D1 detected and output by the detecting unit D2 is input (Step S4).
[0021]
Here, if a time twice as long as the target time required for unloading (3 seconds in this case) has elapsed before the disk tray unloading completion detection signal 7 is input (step S6), the disk tray D1 It is determined that unloading has failed, and an abnormal end process is performed to stop the unloading process (step S8).
[0022]
When the unloading of the disk tray D1 is completed and the disk tray unloading completion detection signal 7 is input (step S4), the measurement of the time required for unloading the disk tray by the timer unit 2 is completed (step S5). The arithmetic processing unit 3 calculates the ratio between the target time required for unloading the disk tray and the measured time required for the actual unloading measured by the timer unit 2 (step S7).
[0023]
If the measured time required for the actual unloading measured by the timer unit 2 differs from the target time required for unloading by 10% or more (step S9), the target unloading time and the measured time (Step S10), and when the unloading of the disk tray D1 is completed earlier than the target time, the control power is reduced to reduce the unloading time, so that the control voltage output time T2 is reduced by 3% ( Step S11). Conversely, when the unloading of the disk tray D1 is completed later than the target time, the control voltage output time T2 is extended by 5% in order to increase the control power and shorten the unloading time (step S12).
[0024]
Regarding the rate of change of each control voltage output time T2 in step S11 and step S12, actually, the error from the target time due to the mechanical load or the like is at most about 20%, and this error is repeated several times instead of once. The carry-out and carry-in speeds are adjusted in such a way that the difference between the target time and the target time is, for example, 10% or more in the case where the error with the target time is about 10%. This is because the control voltage output time T2 can be quickly absorbed by ending the control by the time adjustment. On the other hand, as compared with the case where the control voltage output time T2 is extended by 5% in step S12, the control voltage output time T2 is shortened by 3% in step S11. The reason why the adjustment amount of the control voltage is small is that the control voltage output time T2 is excessively shortened even when the error from the target time is 10% or more, for example. Tray is in order to control the voltage output time T2 which can avoid the risk of repeating the time adjusted many times out loading of the result tray not open and close.
[0025]
The control voltage output time T2 changed as described above is stored in the output storage unit 4 as the control voltage output time T2 for the next and subsequent disk tray unloading (step S13), and the unloading control of the disk tray D1 ends. (Step S14). At the start of the next disk tray unloading (step S1), the changed control voltage output time T2 for disk tray unloading control is read from the output storage unit 4, and the control voltage output time T2 is set as the target time. It controls the unloading of the tray D1.
[0026]
By performing the above control every time the disk tray D1 is carried out, it is possible to absorb inherent variations such as the load on the disk tray D1 and to perform stable carry-out control for the disk tray D1 in a certain time.
[0027]
When the disc tray D1 is carried in, the same control as when the disc tray D1 is carried out is performed by using the carry-in completion detection signal 6 which is detected and output by the detection unit D2 and indicates the completion of carrying-in of the disc tray D1. This makes it possible to perform stable loading control of the disk tray D1.
[0028]
Further, in the above description, by using a non-volatile memory such as an EEPROM as the output storage unit 4, even if the power of the disk drive is turned off, the disk tray unloading control and the disk tray unloading control to be used at the next disk tray unloading and loading. As the control voltage output time T2 for controlling the loading of the disk tray, the time after the change can be read.
[0029]
By repeatedly executing this process every time the disk tray D1 is carried out and carried in, it is possible to carry out the control of carrying out and carrying in the disk tray in a stable time even if a load variation due to aging occurs.
[0030]
【The invention's effect】
As described above, according to the present invention, the control output to the rotary drive motor is adjusted when the time required for unloading and loading deviates from a predetermined allowable range from the time required for unloading and loading. Thereby, the time required to carry out and carry in the disk tray can be made constant.
[0031]
In addition, by storing the adjusted control output for the rotary drive motor, the adjusted control output can be supplied as the control output to the rotary drive motor at the time of the next disk tray unloading and loading operation.
[0032]
Therefore, in the loading and unloading operations of the disk tray, inherent load fluctuations such as variations in the winding resistance of the motor and load variations when the disk tray slides, and load fluctuations due to aging, the movement speed and the like are also considered. The drive control of the disk tray can be stably performed at low cost without requiring a special mechanism such as a detection mechanism.
[Brief description of the drawings]
FIG. 1 is a block diagram illustrating a configuration of a disk drive device according to an embodiment of the present invention; FIG. 2 is a control output waveform diagram illustrating a disk tray driving operation in the disk drive device according to the embodiment; Showing a disk tray driving operation in a disk drive device according to the present embodiment.
REFERENCE SIGNS LIST 1 disk tray drive motor 2 timer unit 3 arithmetic processing unit 4 output storage unit 5 motor drive control unit 6 carry-in completion detection signal 7 carry-out completion detection signal D1 disk tray D2 detection unit

Claims (2)

A rotary drive motor that drives the drive target with a rotational force, a disk tray that is driven by the rotational force of the rotary drive motor to unload and load a disk, and a detection unit that detects completion of unloading and loading of the disk tray, A timer unit that measures the time required for the completion of the unloading and the completion of the loading based on the detection signal from the detection unit, and the predetermined time required for the unloading and the loading, and the rotation driving at the time of unloading and loading the disk. A storage unit that stores a control output to the motor, and a time required for the completion of the unloading and the completion of the loading measured by the timer unit is out of a predetermined allowable range from the time required for the predetermined unloading and the loading. And a drive control unit for adjusting a control output to the rotary drive motor only in the case. 2. The disk drive device according to claim 1, wherein a control output to the rotary drive motor after the adjustment by the drive control unit is stored in the storage unit.

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