JP2009087498A - Optical disk device and control method of optical disk device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To decrease noise generated when an optical pickup is moved in the radial direction of a disk. <P>SOLUTION: An optical device is provided with: a focusing actuator which moves an objective lens mounted on an optical pickup to a position at which a light beam emitted from the objective lens is focused on the recording plane of the disk-like recording medium by controlling movement of the objective lens; a tracking actuator moving the objective lens in the radial direction of the disk-like recording medium; a sled motor moving the optical pickup in the radial direction of the disk-like recording medium; and a control means performing drive control of the sled motor, the focusing actuator and the tracking actuator, wherein control of the focusing actuator and the tracking actuator is stopped while the optical pickup is moved to the vicinity of a target track, and the optical pickup is moved by the sled motor. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an optical disk device and a method for controlling the optical disk device, and more particularly to a technique suitable for use in a seek control method for moving an optical pickup equipped with an objective lens in the radial direction of the disk.

  In the personal computer introduced in Patent Document 1, the ambient sound level is detected by a microphone in order to solve the problems of seek noise reduction and seek performance degradation and to provide a low-cost and high-performance notebook PC. Then, the high-speed seek and the low-speed seek of the hard disk drive are switched according to the microphone volume level.

Japanese Patent Laid-Open No. 11-126422

  In the personal computer introduced in Patent Document 1, a hard disk drive is mounted as a recording device. In the hard disk drive, the recording frequency is extremely finely fragmented and recorded, so that the seek frequency during use of the apparatus is extremely high. However, if the seek is restricted in all sound volume states, data access is broken. Therefore, seek restriction is performed only when the sound volume is low, and a low noise seek operation is performed.

  The noise caused by the seek operation as described above is similarly generated when the optical pickup is moved in the radial direction of the disk in the optical disk drive. For example, in the case of a DVD, the position of the pickup on the disk is roughly moved by a seek motor, and then the actuator is driven using a tracking error signal to irradiate the target track with the light beam.

Therefore, when the pickup is greatly moved in the radial direction of the disk, the tracking error signal for actuator control also changes continuously. For this reason, the actuator is also driven continuously, and there is a problem that a large noise is generated.
The present invention has been made in view of the above-described problems, and an object thereof is to reduce noise generated when an optical pickup is moved in the radial direction of a disk.

  An optical disc apparatus of the present invention includes an irradiation unit that irradiates a disk-shaped recording medium on which a large number of tracks are formed with a light beam, and a light receiving unit that detects reflected light of the light beam emitted from the irradiation unit. An optical pickup, an actuator for controlling the movement of an objective lens mounted on the optical pickup to change the irradiation position of the light beam on the disk-shaped recording medium, and an optical pickup mounted with the objective lens in the disk shape A sled motor that moves the recording medium in the radial direction; and a control unit that controls the driving of the sled motor and the actuator, and the control unit moves the optical pickup to the vicinity of the target track. Stop the actuator control and move the optical pickup by the sled motor. The features.

  An optical disk apparatus control method according to the present invention includes an irradiation unit that irradiates a disk-shaped recording medium on which a large number of tracks are formed with a light beam, and a light receiving unit that detects reflected light of the light beam emitted from the irradiation unit An optical pickup including: an actuator that moves and controls an objective lens mounted on the optical pickup to change an irradiation position of the light beam on the disk-shaped recording medium; and an optical pickup on which the objective lens is mounted. A control method for an optical disc apparatus, comprising: a sled motor for moving the disc-shaped recording medium in a radial direction; and a control means for controlling the driving of the sled motor and an actuator, wherein the optical pickup is moved in the vicinity of a target track. During the operation, the control of the actuator by the control means is stopped and the thread is stopped. Characterized in that for moving the optical pickup by the motor.

  The program of the present invention is a light having an irradiating unit for irradiating a disk-shaped recording medium on which a large number of tracks are formed, and a light receiving unit for detecting reflected light of the light beam irradiated from the irradiating unit A pickup, an actuator for controlling movement of an objective lens mounted on the optical pickup to change the irradiation position of the light beam on the disk-shaped recording medium, and an optical pickup mounted with the objective lens on the disk-shaped recording A program for causing a computer to execute a process of controlling an optical disc apparatus having a sled motor that moves in a radial direction of a medium, and a control unit that performs drive control of the sled motor and an actuator. While moving to the vicinity, the actuator is controlled by the control means. Stop your, characterized in that to execute the step of moving the optical pickup by the sled motor to the computer.

  According to the present invention, while the optical pickup is moved to the vicinity of the target track, the control of the actuator is stopped and the optical pickup is moved by the thread motor. Thereby, the noise generated when the optical pickup is moved in the radial direction of the disk can be reduced.

(First embodiment)
Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.
FIG. 2 is a block diagram showing an example of the configuration of the disc camcorder according to the first embodiment of the present invention. In FIG. 2, 201 is a microphone provided as an audio input means, 203 is an audio compression unit, 211 is a camera, 213 is an image compression unit, 221 is a buffer memory, and 223 is a pre-recording processing unit. The audio compression unit 203 functions as an audio data storage unit that generates audio data from the ambient sound captured via the microphone 201 and stores it in the buffer memory 221.

  Reference numeral 225 denotes a laser diode driver, 227 denotes a laser diode, 231 denotes a light receiving sensor, 233 denotes a light receiving sensor amplifier, 235 denotes a tracking error calculation unit, and 237 denotes a focus error calculation unit. Reference numeral 241 denotes a thread motor driver, 243 a thread motor, 245 a spindle motor, 251 an actuator driver, 253 an actuator, 255 a magnet, and 257 an objective lens. 259 is an optical pickup unit, 261 is a system controller, and 271 is a recording switch.

FIG. 4 shows the positional relationship between the disc-shaped recording medium 102 and the optical pickup 103 in the optical disc apparatus 101 of the present embodiment. The disk-shaped recording medium 102 is controlled to rotate at a predetermined speed by a rotary motor 104. In the optical pickup 103, various controls are performed on the disc-shaped recording medium 102 by the control unit 105, as will be described later. The control unit 105 performs drive control of the sled motor, the focusing actuator, and the tracking actuator as will be described later.
4 corresponds to the optical pickup unit 259 in FIG. 2, and the motor 104 corresponds to the spindle motor 245.

  The disk-shaped recording medium 102 is formed with a number of tracks for recording image data and audio data by a light beam emitted from an irradiation unit mounted on the optical pickup 103. The light beam reflected from the disc-shaped recording medium 102 is received by a light receiving sensor 231 provided as a light receiving unit.

FIG. 1 is a flowchart for explaining an example of the seek control method of the disc camcorder of the present embodiment configured as described above.
First, the background art will be described. In the disc camcorder, since the main function is to record the sound itself on the optical disc, the continuity of the data is emphasized, so that the image sound data is continuously arranged and recorded. Therefore, as long as an unrecorded disc is used, seeking during normal recording does not occur.

  However, at the start of recording, movement of the optical pickup to the test area for adjusting the recording light power, movement of the optical pickup for searching the recording start point, and the like frequently occur. The seek in this optical disc is usually performed by a cooperative operation of a thread motor (coarse adjustment) and an actuator (fine adjustment).

  The thread motor 243 is structurally less likely to generate extra energy because the rotational speed is accurately determined by the applied pulse number. On the other hand, since the actuator 253 uses electromagnetic dynamics, surplus energy is likely to be generated, and surplus energy is released as noise. In addition, as described above, seeking is normally performed by cooperative work of the thread motor 243 (coarse adjustment) and the actuator 253 (fine adjustment), but the number of tracks moved in the radial direction as means for performing fine adjustment by the actuator 253. The method of counting is taken.

  For this reason, when fine adjustment is performed by the tracking actuator, the focusing actuator is also controlled to perform fine adjustment in parallel. As a result, the two electromagnetic forces are in close contact with each other at an extremely close position on the optical pickup, which causes a seek sound to increase. The focusing actuator changes the irradiation position of the light beam and moves the light beam to a position for focusing on the recording surface of the disk-shaped recording medium.

  In a system in which an optical disk is applied to a data storage device such as a personal computer, there is no problem as long as the noise generated by the system is a level that can be endured by the user. However, in the case of a system having the main function of recording audio, such as the disc camcorder of this embodiment, noise generated from the optical disc unit remains as recorded data, so that the produced work can withstand user viewing. It may become impossible.

  The disc camcorder may start a recording operation immediately after the power is turned on. Therefore, the system controller 261 confirms the state of the recording switch 271 (step S301).

  If the result of this confirmation is that the recording switch 271 has not yet been operated, the optical pickup is moved to the learning area on the disc by a normal seek method (step S303). Here, the normal seek method is to move the objective lens 257 at the same time as the optical pickup is moved by the sled motor 243. That is, the thread motor 243 moves (roughly adjusts) to the vicinity of the target position, and the actuator 253 finely adjusts the target position.

  The disk reflected light is received and detected by the light receiving sensor 231, amplified by the light receiving sensor amplifier 233, and the tracking error calculating unit 235 calculates the tracking error, so that the system controller 261 can count the number of moving tracks. . Therefore, by controlling the sled motor 243 while maintaining the state in which the focus actuator is controlled, the movement destination position of the optical pickup can be calculated accurately and quickly.

  The optical pickup is moved to the beginning of a new unrecorded area on the disc after grasping the recording characteristics of the disc (not shown) inserted into the disc camcorder in the learning area. That is, here, the system controller 261 controls the actuator 253 via the actuator driver 251 while controlling the thread motor 243 again via the thread motor driver 241.

  On the other hand, as a result of the system controller 261 confirming the state of the recording switch 271 in step S301, if the recording switch 271 is operated to start recording, the image pickup being input is stored in the buffer memory 221 and the optical pickup Move. That is, the input voice from the microphone 201 is AD converted, compressed by the voice compression unit 203, and stored in the buffer memory 221.

  Also, the input image from the camera 211 is AD converted, and then compressed by the image compression unit 213 and stored in the buffer memory 221 (step S305). At this point, the optical pickup position is at the home position. Since this position is not the recording start position, the operation of starting to transfer the audio data and the image data stored in the buffer memory 221 to the disk-shaped recording medium is not immediately performed.

  Next, the optical pickup is moved to the learning area on the disk by a seek method that controls only the sled motor 243 without controlling the actuator 253 (step S307). In this case, first, only the rotation speed of the sled motor 243 is controlled to move the optical pickup unit 259 to the target position. Next, the target position is corrected by controlling the actuator 253 and reading the current position address.

  When the sled motor 243 and the actuator 253 are always controlled at the same time, the sound noise emitted from the actuator 253 goes around the microphone 201 of the camcorder for a long time. Therefore, if the sled motor 243 and the actuator 253 are time-division controlled, the period during which the audio noise is generated can be suppressed in a short time.

  The optical pickup grasps the recording characteristics of the disc inserted into the disc camcorder in the learning area and then moves to the beginning of a new unrecorded area on the disc. In this case as well, the thread motor 243 and the actuator 253 are sometimes turned on. Divide control. That is, first, only the rotation speed of the sled motor 243 is controlled to move the optical pickup to the target position, and then the current position address is read by controlling the actuator 253 to correct the target position.

  Next, the system controller 261 confirms the state of the recording switch 271 again (step S309). If the result of this confirmation is that the recording switch 271 has been operated to the recording end side, first, the saving of the currently input image audio to the buffer memory 221 is stopped (step S310).

  Then, the optical pickup is moved to the beginning of a new unrecorded area on the disc by a normal seek method (step S313). As described above, the normal seek method is to move the optical pickup unit 259 by the sled motor 243 and simultaneously control the movement of the objective lens 257 by the actuator 253. That is, the system controller 261 controls the sled motor 243 while counting the number of moving tracks, thereby accurately and quickly controlling the movement destination position of the optical pickup. Finally, the image / audio data in the buffer memory 221 is recorded at a predetermined position on the disc-shaped recording medium (step S315).

  That is, the audio / video data stored in the buffer memory 221 is converted into a recording data string corresponding to the disk recording / reproduction characteristics such as NRZI (Non Return to Zero Invert) by the recording preprocessing unit 223. Then, the recording data string is further converted into a recording strategy by the laser diode driver 225, changed to a pulse having an appropriate voltage and time width, and applied to the laser diode 227. As a result, the emitted light passes through optical system parts (not shown) and reaches the disk surface, and recording on the disk-shaped recording medium is performed.

  On the other hand, if the system controller 261 confirms the state of the recording switch 271 again in step S309, and the recording continuation state is maintained, the remaining amount of the buffer memory 221 that records the input image and sound is confirmed. (Step S311). If the remaining amount of the buffer memory does not exceed the threshold value and there is a sufficient margin, the process returns to step S305. Then, the image pickup being input is stored in the buffer memory 221 again, and the optical pickup is moved under the initiative of the sled motor 243 (step S307).

  On the other hand, if the remaining amount of the buffer memory 221 exceeds the threshold value as a result of the confirmation of the remaining amount in step S311, the data stored in the buffer memory 221 is quickly transferred to the disc-shaped recording medium. It is necessary to post to. For this reason, the optical pickup is moved to the beginning of a new unrecorded area on the disc by a normal seek method (step S313).

  In a normal seek method, the system controller 261 controls the sled motor 243 while counting the number of moving tracks, thereby accurately and quickly controlling the movement destination position of the optical pickup. As a result, the optical pickup can be moved to the beginning of a new unrecorded area on the disc. Finally, the video / audio data in the buffer memory 221 is recorded on the disk (step S315).

  That is, the audio / video data in the buffer memory 221 is converted into a recording data string corresponding to the disk recording / reproduction characteristics such as NRZI by the recording preprocessing unit 223. Then, the recording data string is further converted into a recording strategy by the laser diode driver 225, changed to a pulse having an appropriate voltage and time width, and applied to the laser diode 227. As a result, the emitted light passes through optical system parts (not shown) and reaches the disk surface, and recording on the disk is performed. After the image / audio data in the buffer memory 221 is recorded on the disk-shaped recording medium, the process returns to step S301 to repeat the above-described processing.

(Second Embodiment)
Next, a second embodiment of the present invention will be described with reference to the flowchart of FIG.
In the first embodiment described above, whether “normal seek” or “seek by the thread motor 243” is switched according to the state of the recording switch 271 is switched. On the other hand, in the present embodiment, when the optical pickup unit 259 moves from the initial position to the target position, the driving of the focusing actuator and the tracking actuator is stopped to reduce the noise from the actuator.

Hereinafter, an example of the processing procedure of the present embodiment will be described with reference to the flowchart of FIG.
First, in step S31, it is determined whether or not there is an instruction to start access to the disk-shaped recording medium. If there is no instruction to start access as a result of this determination, the process waits until there is an instruction to start access.

  If the result of determination in step S31 is that there is an instruction to start access, the process proceeds to step S32, where seek is performed by the sled motor 243 to the target position. Therefore, in this case, since the focusing actuator and the tracking actuator are not controlled, it is possible to prevent noise from the actuator.

  When seeking by the sled motor 243, it is determined whether or not the destination position has been reached (step S33). If the destination position has not been reached, the process returns to step S32 to continue the seek by the sled motor 243.

  If the result of determination in step S33 is that the target position has been reached, control proceeds to step S34, where control of the focusing actuator and tracking actuator is started. As a result, the optical pickup is controlled to accurately trace a predetermined position on the disc-shaped recording medium.

  While the focusing actuator and the tracking actuator are being controlled, it is periodically determined whether or not an instruction to end access to the disk-shaped recording medium has been given (step S35). If the result of this determination is that an instruction to end access has not been given, processing returns to step S34 and fine adjustment control is performed.

  On the other hand, if an instruction to end access is given as a result of the determination in step S35, the process proceeds to step S36, where the optical pickup unit 259 is moved to the initial position by the sled motor 243, and movement control processing of the optical pickup unit 259 is performed. finish.

(Another embodiment according to the present invention)
Each means constituting the optical disk device according to the embodiment of the present invention described above can be realized by operating a program stored in a RAM or ROM of a computer. This program and a computer-readable recording medium recording the program are included in the present invention.

  In addition, the present invention can be implemented as a system, apparatus, method, program, storage medium, or the like, and can be applied to a system composed of a plurality of devices. Moreover, you may apply to the apparatus which consists of one apparatus.

  In the present invention, a software program (in the embodiment, a program corresponding to the flowcharts shown in FIGS. 1 and 3) for executing each step in the control method of the optical disk apparatus described above is directly or remotely transmitted to the system or apparatus. Supply from. In addition, this includes a case where the system or the computer of the apparatus is also achieved by reading and executing the supplied program code.

  Accordingly, since the functions of the present invention are implemented by computer, the program code installed in the computer also implements the present invention. In other words, the present invention includes a computer program itself for realizing the functional processing of the present invention.

  In that case, as long as it has the function of a program, it may be in the form of object code, a program executed by an interpreter, script data supplied to the OS, and the like.

  Various recording media can be used as a recording medium for supplying the program. For example, floppy (registered trademark) disk, hard disk, optical disk, magneto-optical disk, MO, CD-ROM, CD-R, CD-RW, magnetic tape, nonvolatile memory card, ROM, DVD (DVD-ROM, DVD- R).

  As another program supply method, a browser on a client computer is used to connect to an Internet home page. The computer program itself of the present invention or a compressed file including an automatic installation function can be downloaded from the homepage by downloading it to a recording medium such as a hard disk.

  It can also be realized by dividing the program code constituting the program of the present invention into a plurality of files and downloading each file from a different homepage. That is, a WWW server that allows a plurality of users to download a program file for realizing the functional processing of the present invention on a computer is also included in the present invention.

  In addition, the program of the present invention is encrypted, stored in a storage medium such as a CD-ROM, distributed to users, and key information for decryption is downloaded from a homepage via the Internet to users who have cleared predetermined conditions. Let It is also possible to execute the encrypted program by using the key information and install the program on a computer.

  In addition to the functions of the above-described embodiments being realized by the computer executing the read program, the OS running on the computer performs part or all of the actual processing. Also, the functions of the above-described embodiments can be realized.

  Further, the program read from the recording medium is written in a memory provided in a function expansion board inserted into the computer or a function expansion unit connected to the computer. Thereafter, the CPU of the function expansion board or function expansion unit performs part or all of the actual processing based on the instructions of the program, and the functions of the above-described embodiments are realized by the processing.

5 is a flowchart illustrating an example of a disc camcorder seek control method according to the embodiment of this invention. 1 is a block diagram illustrating an example of the configuration of a disc camcorder according to an embodiment of the present invention. It is a flowchart which shows the embodiment of this invention and demonstrates the example which performs the seek by a sled motor. It is a figure explaining the correspondence between a disk-shaped recording medium and an optical pickup.

Explanation of symbols

201 Microphone 203 Audio compression unit 211 Camera 213 Image compression unit 221 Buffer memory 223 Recording pre-processing unit 225 Laser diode driver 227 Laser diode 231 Light reception sensor 233 Light reception sensor amplifier 235 Tracking error calculation unit 237 Focus error calculation unit 241 Thread motor driver 243 Thread Motor 245 Spindle motor 251 Actuator driver 253 Actuator 255 Magnet 257 Objective lens 259 Optical pickup unit 261 System controller 271 Recording switch

Claims (8)

An optical pickup having an irradiation unit for irradiating a light beam onto a disk-shaped recording medium on which a large number of tracks are formed, and a light receiving unit for detecting reflected light of the light beam irradiated from the irradiation unit;
An actuator that controls movement of an objective lens mounted on the optical pickup to change an irradiation position of the light beam on the disc-shaped recording medium;
A thread motor that moves the optical pickup on which the objective lens is mounted in the radial direction of the disc-shaped recording medium;
Control means for performing drive control of the thread motor and the actuator,
The optical disc apparatus is characterized in that the control means stops the control of the actuator and moves the optical pickup by the sled motor while the optical pickup is moved in the vicinity of a target track. Voice input means for capturing ambient sounds;
Voice data storage means for storing voice data generated from ambient sounds captured via the voice input means in a storage medium;
Recording means for recording audio data stored in the storage medium onto the disc-shaped recording medium,
2. The control unit according to claim 1, wherein the control unit moves the optical pickup by controlling the sled motor while the audio data is stored in the storage medium by the audio data storage unit. Optical disk device.   The control unit controls the focusing actuator and the tracking actuator in addition to the control of the thread motor when the recording unit records the audio data stored in the storage medium on the disk-shaped recording medium. The optical disc apparatus according to claim 2, wherein the optical pickup is moved. An optical pickup having an irradiation unit for irradiating a light beam onto a disk-shaped recording medium on which a large number of tracks are formed, and a light receiving unit for detecting reflected light of the light beam irradiated from the irradiation unit;
An actuator that controls movement of an objective lens mounted on the optical pickup to change an irradiation position of the light beam on the disc-shaped recording medium;
A thread motor that moves the optical pickup on which the objective lens is mounted in the radial direction of the disc-shaped recording medium;
A control method of an optical disc apparatus having control means for controlling the driving of the thread motor and the actuator,
A control method of an optical disc apparatus, wherein the control of the actuator by the control means is stopped while the optical pickup is moved by the sled motor while the optical pickup is moved in the vicinity of a target track. Voice input process to capture ambient sounds;
A voice data storage step of storing voice data generated from ambient sounds captured through the voice input step in a storage medium;
Recording the audio data stored in the storage medium on the disk-shaped recording medium,
5. The optical disc apparatus control according to claim 4, wherein the optical pickup is moved by controlling the sled motor while the audio data is stored in the storage medium in the audio data storing step. 6. Method.   When recording the audio data stored in the storage medium onto the disc-shaped recording medium in the recording step, in addition to controlling the thread motor, the focusing actuator and tracking actuator are controlled to control the optical pickup. 6. The method of controlling an optical disk device according to claim 5, wherein the optical disk apparatus is moved. An optical pickup having an irradiation unit for irradiating a light beam onto a disk-shaped recording medium on which a large number of tracks are formed, and a light receiving unit for detecting reflected light of the light beam irradiated from the irradiation unit;
An actuator that controls movement of an objective lens mounted on the optical pickup to change an irradiation position of the light beam on the disc-shaped recording medium;
A thread motor that moves the optical pickup on which the objective lens is mounted in the radial direction of the disc-shaped recording medium;
A program for causing a computer to execute a step of controlling an optical disc apparatus having a control means for controlling drive of the thread motor and the actuator,
While moving the optical pickup to the vicinity of the target track, the control of the actuator by the control means is stopped and the computer is caused to execute the step of moving the optical pickup by the sled motor. .   A computer-readable storage medium storing the program according to claim 7.

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