JP2008243297A - Optical disk device, and its control method and program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical disk device for increasing an accessibility by increasing the driving voltage of an optical pickup when the optical pickup cannot access a desired reproduction position, and to provide its control method and program. <P>SOLUTION: This optical disk device is provided with a determination part 73 for determining, after a driving control unit 5 for controlling the operation of the motor of a thread feed mechanism 4 drives the motor by a normal driving voltage to move an optical pickup D, whether or not the optical pickup D has reached a desired address based on a signal detected by the optical pickup D, and a voltage control unit 75 for instructing, if the determination part 73 determines that the optical pickup D has not reached the address, the driving control part 5 to drive the motor by a driving voltage higher than a predetermined driving voltage. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an optical disc apparatus that reads an optical disc signal with an optical pickup, and more particularly to an optical disc apparatus with improved operation of a thread feeding mechanism that moves an optical pickup, a control method thereof, and a control program.

  In a disc player that records and reproduces an optical disc such as a CD or DVD, the recording surface is irradiated with laser light through an optical pickup including an objective lens, and the reflected light is converted into an electric signal. Reading the recorded signal.

Such an optical pickup follows a pit on a rotating recording surface by a thread feeding mechanism that moves in the radial direction of the disk. However, when selecting a music, it is necessary to jump to a desired track. This track jump is to repeatedly move the optical pickup by a predetermined amount by applying a voltage to the motor that drives the thread feeding mechanism for a predetermined time to reach a desired position (see Patent Document 1).
Registered Utility Model No. 3012990

  By the way, the minimum voltage at which the thread feeding mechanism for driving the optical pickup operates becomes high due to the influence of the variation in the mechanism and the change in temperature, and there is a case where the operation is not performed sufficiently at a predetermined operating voltage. For example, when the friction resistance of the contact part is high due to the cutting process of the feed screw, or when the resistance value of the motor rises due to high temperature, the motor voltage at which the thread feed mechanism can operate is Get higher.

  However, in such a case, if the predetermined driving voltage set in advance is maintained, the amount of movement of the optical pickup is insufficient when the voltage is applied for a predetermined time. For this reason, even if the music selection operation is performed by repeating the track jump, the access may not be completed and the music selection may not be performed.

  In order to cope with this, it is conceivable to increase the drive voltage uniformly. However, in this case, conversely, the amount of movement of the optical pickup is too large and an overrun occurs, resulting in a long access time. Further, when the drive voltage is increased, there is a problem that the operation sound of the thread feeding mechanism is increased.

  The present invention has been proposed in order to solve the above-described problems of the prior art, and its purpose is to increase the driving voltage of the optical pickup when the optical pickup cannot access a desired reproduction position. Accordingly, it is an object of the present invention to provide an optical disc apparatus, a control method thereof, and a control program that can increase the possibility of access.

  In order to solve the above problems, the invention of claim 1 is directed to an optical pickup that detects a signal recorded on an optical disc, a drive mechanism that moves the optical pickup in a radial direction of the optical disc, and a drive source of the drive mechanism. In the optical disc apparatus comprising: a motor that operates at a predetermined drive voltage; and a drive control unit that controls the operation of the motor so that the optical pickup moves to a desired reproduction position on the optical disc. Whether the optical pickup has reached the reproduction position based on a signal detected by the optical pickup after the drive control unit has moved the optical pickup by operating the motor with a first drive voltage. A determination unit that determines whether or not the driving is performed when the determination unit determines that the reproduction position has not been reached. A control unit, and having a voltage control unit for instructing to operate said motor by said first drive voltage higher second driving voltages than. The inventions of claims 4 and 5 are obtained by capturing the invention of claim 1 from the viewpoint of a method and a computer program.

  In the first, fourth, and fifth inventions described above, when the desired reproduction position cannot be reached with the normal first drive voltage, the reproduction is performed by driving the motor with a higher second drive voltage. The possibility of reaching the position can be increased.

According to a second aspect of the present invention, in the optical disc apparatus of the first aspect, the optical disk apparatus further includes a setting storage unit that stores the number of times the determination by the determination unit is repeated before the motor is operated by the second drive voltage. To do.
According to a third aspect of the present invention, in the optical disk apparatus of the first aspect, the optical disk apparatus further includes a setting storage unit that stores a time for repeating the determination by the determination unit until the motor is operated by the second drive voltage. To do.

  In the inventions of claims 2 and 3 as described above, malfunctions can be prevented by increasing the drive voltage after repeating access to the reproduction position a predetermined number of times or time.

  According to the present invention as described above, when the optical pickup cannot access a desired reproduction position, the optical pickup apparatus capable of increasing the access possibility by increasing the drive voltage of the optical pickup, its control method, and A control program can be provided.

  One embodiment (this embodiment) to which the present invention is applied will be specifically described with reference to the drawings. In this embodiment, the microcomputer and its peripheral circuits are operated in accordance with a program for realizing the functions of the respective units described below, thereby controlling the motor and the like. Various changes are possible.

  Therefore, in the following description, a virtual circuit block that realizes each function of the present invention is used. In addition, the control method, the program for realizing this by a computer, and the recording medium on which this is recorded are also one aspect of the present invention.

[Constitution]
First, the configuration of the present embodiment will be described with reference to FIG. In addition, about the general functional part required for an optical disk apparatus, since all the well-known techniques are applicable, description is abbreviate | omitted.

  That is, in this embodiment, as shown in FIG. 1, the disk D mounted on the turntable 1 is rotated by the spindle motor 2, and the optical pickup 3 is scanned in the radial direction by the thread feeding mechanism (drive mechanism) 4. The present invention is applied to a disk player that records and reproduces information on the recording surface of the disk D by detecting reflected laser light.

  Reference numeral 5 denotes a drive control unit (driver) that controls a motor (not shown) that drives the thread feeding mechanism 4. Reference numeral 6 denotes an address reading unit 6 that reads position information (address) of a subcode of the optical disc D based on a recording signal detected by the optical pickup 3.

  Further, 7 is a control device for controlling the optical disk device. The control device 7 includes a setting storage unit 71, a comparison unit 72, a determination unit 73, a counter 74, and a voltage control unit 75 in addition to a general control function.

  The setting storage unit 71 is a means for storing various settings such as a target address, a normal driving voltage of the thread motor, a high driving voltage after change, and the number of thread jumps. The comparison unit 72 is a unit that compares the address read by the address reading unit 6 with the target address stored in the setting storage unit 71.

  The determination unit 73 is means for determining whether the read address has reached the target address (whether it matches or exceeds). The counter 74 is means for incrementing (counting) a counter variable indicating the number of times the thread jump is repeated when the read address does not reach the target address.

  The voltage control unit 75 is means for instructing the drive control unit 5 to apply a high drive voltage when the count of the counter 74 exceeds a predetermined number stored in the setting storage unit 71. Although not shown, the user can perform a desired music selection input from input means such as a front panel, a remote control switch, or a touch panel.

[Action]
The operation of the present embodiment as described above will be described with reference to the flowchart of FIG. First, when the user inputs music selection, the address of the beginning of the selected track is stored in the setting storage unit 71. In order to move the optical pickup 3 to this address, access by the thread feeding mechanism 4 is started, and the counter variable for counting the number of times of movement is cleared (step 201).

  The voltage control unit 75 sets the normal voltage as the drive voltage of the optical pickup 3 to the drive control unit 5 (step 202). The drive control unit 5 instructs the thread feeding mechanism 4 to move the optical pickup 3 with the set drive voltage. Thereby, the optical pickup performs a predetermined amount of movement (track jump) toward the selected address (step 203).

  At the above destination, the address reading unit 6 reads the address recorded on the optical disc D based on the signal from the optical pickup 3 (step 204). The comparison unit 72 compares the read address with the selected music address. If the determination unit 73 determines that the read address has not reached the selected address, the counter 74 increments (+1) the counter variable (step 206).

  When the value of the counter variable does not exceed the predetermined number (step 207), the track jump is performed again (steps 203 and 204). When the read address does not reach the selected address (step 205) and exceeds the predetermined number of times (step 207), the voltage control unit 75 stores the drive control unit 5 in the setting storage unit 71. The driving with the high driving voltage is instructed (step 208).

  In this way, the track jump is performed with the drive voltage raised (step 203). By increasing the drive voltage, the amount of movement of the optical pickup 3 increases. Then, it is determined whether or not the address read after the movement has reached the selected address (steps 204 and 205).

  If the read address matches or exceeds the selected address and has already been changed to a high drive voltage (step 209), it is returned to the original drive voltage (step 210). Then, the counter variable is cleared and the process is terminated (step 210).

  If the optical pickup 3 reaches the selected address without changing the drive voltage (steps 205 and 209), it is not necessary to return the drive voltage, and the counter variable is cleared and processed. Is finished (step 210).

[effect]
According to the present embodiment as described above, when the optical pickup 3 is moved with the normal drive voltage set, and the optical pickup 3 does not reach the desired address, the drive voltage is increased to increase the movement amount. By ensuring, the possibility that the optical pickup 3 can reach a desired address can be increased. Therefore, even if the minimum operating voltage increases due to mechanism variations, temperature changes, etc., it becomes possible to select music stably.

  In addition, when the predetermined number of accesses are repeated and the desired address cannot be reached yet, the drive voltage is increased, so that malfunction due to frequent increase of the drive voltage can be prevented.

[Other Embodiments]
The present invention is not limited to the above embodiment. For example, the value of the normal drive voltage and the drive voltage higher than that is not limited to a specific value, and can be freely set according to the conditions of the motor, the device, and the like. The setting of the number of times the track jump is repeated is not limited to a specific value. The repetition of the track jump may be limited by setting a predetermined time instead of the number of track jumps.

  If the optical pickup cannot be accessed even if the drive voltage is increased once, the drive voltage may be increased a plurality of times. In this case, an excessive increase may be limited by setting an upper limit of the number of times of increase or time. The above various settings may be set as defaults, but may be input / changed to desired settings by the user using the input means.

  In addition, various hardware configuration modes are possible, such as a so-called chip that realizes each function exemplified above and its peripheral circuit, or a system LSI or ASIC that integrates a plurality of functions. The specific embodiment is not limited. Furthermore, the discs to which the present invention is applied are not limited to various CDs and DVDs (regardless of standards), and can be applied to all types of rotary recording media. It may be a reproduction-only one or a recordable / reproducible one.

1 is a functional block diagram showing an embodiment of an optical disc device of the present invention. It is a flowchart which shows the process sequence in embodiment of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Turntable 2 ... Spindle motor 3 ... Optical pick-up 4 ... Thread feed mechanism 5 ... Drive control part 6 ... Address reading part 7 ... Control apparatus 71 ... Setting memory | storage part 72 ... Comparison part 73 ... Determination part 74 ... Counter 75 ... Voltage Control unit

Claims (5)

An optical pickup for detecting a signal recorded on an optical disc, a drive mechanism for moving the optical pickup in the radial direction of the optical disc, a motor that is a drive source of the drive mechanism and operates at a predetermined drive voltage, In an optical disc apparatus having a drive control unit that controls the operation of the motor so that the optical pickup moves to a desired reproduction position.
After the drive control unit moves the optical pickup by operating the motor with a first drive voltage, the optical pickup reaches the reproduction position based on a signal detected by the optical pickup. A determination unit for determining whether or not
Voltage that instructs the drive control unit to operate the motor with a second drive voltage higher than the first drive voltage when the determination unit determines that the reproduction position has not been reached. A control unit;
An optical disc apparatus comprising:   2. The optical disc apparatus according to claim 1, further comprising a setting storage unit that stores the number of times the determination by the determination unit is repeated before the motor is operated by the second drive voltage.   2. The optical disc apparatus according to claim 1, further comprising a setting storage unit that stores a time for repeating determination by the determination unit until the motor is operated by the second drive voltage. An optical pickup for detecting a signal recorded on an optical disc, a drive mechanism for moving the optical pickup in the radial direction of the optical disc, a motor that is a drive source of the drive mechanism and operates at a predetermined drive voltage, In a control method of an optical disk apparatus, wherein an optical disk apparatus having a drive control unit that controls the operation of the motor so that the optical pickup moves to a desired reproduction position is controlled by a computer or an electronic circuit.
The computer or electronic circuit has a determination unit and a voltage control unit,
The determining unit moves the optical pickup by operating the motor with a first driving voltage, and then determines whether the optical pickup is based on a signal detected by the optical pickup. Determine if the playback position has been reached,
The voltage control unit operates the motor with a second drive voltage higher than the first drive voltage when the determination unit determines that the reproduction position has not been reached. A control method for an optical disc apparatus, characterized by: An optical pickup for detecting a signal recorded on an optical disc, a drive mechanism for moving the optical pickup in the radial direction of the optical disc, a motor that is a drive source of the drive mechanism and operates at a predetermined drive voltage, In a control program for an optical disc apparatus that causes a computer to control an optical disc apparatus having a drive control unit that controls the operation of the motor so that the optical pickup moves to a desired reproduction position.
In the computer,
After the drive control unit moves the optical pickup by operating the motor with a first drive voltage, the optical pickup reaches the reproduction position based on a signal detected by the optical pickup. Processing to determine whether or not,
The voltage control unit operates the motor with a second drive voltage higher than the first drive voltage when the determination unit determines that the reproduction position has not been reached. Processing to instruct
A control program for an optical disc apparatus, characterized in that

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