JP2011113583A - Optical disk device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical disk device for reducing spin-up time. <P>SOLUTION: The device includes a first optical pickup P1 scanning mainly an inner periphery part A of an optical disk 20, and a second optical pickup P2 scanning mainly an outer periphery part B of the optical disk 20. During spin up to be started after loading the optical disk 20, disk information of the inner periphery part A is read through the first optical pickup P1, and disk information of the outer periphery part B is read through the second optical pickup P2. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an optical disc apparatus for reproducing information recorded on an optical disc or recording / reproducing information on an optical disc.

  Conventionally, many types of optical discs such as CD (compact disc), DVD (digital versatile disc), HD-DVD (high density DVD), and Blu-ray disc have been put to practical use as disk-shaped storage media. In such an optical disc apparatus for reproducing or recording various types of optical discs, the wavelength of the laser beam to be used, the depth of the transparent layer to the recording surface, etc. are different. It is displaced corresponding to each optical disk. In addition, in order to accurately irradiate the recording surface formed on the disk with laser light, servo control is performed to displace the optical spot in the focus direction and the tracking direction.

  This correction in the focus direction is a focusing adjustment, and the correction in the tracking direction is a tracking adjustment, and these focusing adjustment and tracking adjustment are performed via an objective lens driving device (objective lens actuator). The focus direction is a direction parallel to the optical axis direction of the objective lens, and the tracking direction is a direction parallel to the radial direction of the optical disc.

  At the time of reproduction of the optical disk, before reading out audio data or video data recorded on the optical disk, automatic adjustment of the optical pickup is performed, and then audio data or video data is read out and reproduced. This automatic adjustment is an optimization adjustment that determines the optimum parameters for servo control in accordance with the characteristics of the optical pickup. Further, the type of the optical disc is discriminated while rotating the optical disc, the disc information is read, and the optical pickup is set to the initial position for starting reproduction.

  Therefore, when the optical disk is inserted, the optical disk is started up, the type of the optical disk is determined, the control parameter according to the determined type of the optical disk is determined, and the optical pickup is set to the initial position according to the recording state of the disk. (Spin-up process) is executed, and then reproduction or recording is started.

  The disc information is information indicating the control information and recording state of the optical disc, and includes information such as the number of tracks, the track start address, and the track end address. Therefore, the position of the recording area and the unrecorded area on the optical disc can be known by reading the disc information.

  When reading this disc information, the optical pickup is scanned and moved over the entire radius of the disc to read the disc information recorded on the inner periphery of the optical disc and the disc information recorded on the outer periphery of the optical disc. Yes. Therefore, at the start of reproduction or recording, time is required for scanning and moving the optical pickup over the entire surface of the optical disc.

  As described above, the optical disc apparatus spins as a preparatory operation for setting the focusing adjustment and tracking adjustment control states to the predetermined control states on the entire recording surface prior to the reproduction so that the optical disc can be reproduced satisfactorily. Perform up processing. This spin-up process may take several seconds.

  Even when the recorded video is played back immediately, it takes time to actually start playback because the playback is started after the disc type is determined and the recording state of the disc is checked. For this purpose, two optical pickups are provided, and the reading operation for the reproducing disc is executed using the first optical pickup, the reading operation for the recording disc is executed using the second optical pickup, and the loading operation is performed. An application has already been filed for an optical disc recording / reproducing apparatus (for example, see Patent Document 1) that shortens the time until the start of reproduction as a configuration in which reproduction is started immediately when the reproduced disc is a reproduction disc.

  In addition, an information processing apparatus (see, for example, Patent Document 2) in which a plurality of reading heads or a plurality of recording heads are mounted to improve the data editing function has already been filed.

JP 2006-146986 A JP-A-2005-353181

  Since the spin-up process executed after the optical disk is mounted on the optical disk apparatus is executed over the entire area in the radial direction of the optical disk, the spin-up process takes a long time.

  Further, even in an optical disk device having a plurality of optical pickups, if each optical pickup is configured to read the entire area in the radial direction of the optical disk at the time of spin-up processing, automatic adjustment and spin-up processing at the start of operation are performed. The time cannot be shortened sufficiently.

  Therefore, there is a demand for an optical disc apparatus that can shorten the processing time even when the spin-up process is executed over the entire radial direction of the optical disc.

  In view of the above problems, an object of the present invention is to provide an optical disc apparatus capable of shortening the spin-up processing time.

  In order to achieve the above object, the present invention provides an optical disc apparatus that irradiates a signal recording surface of an optical disc with laser light, receives reflected light from the signal recording surface, and reproduces a recording signal on the optical disc. A first optical pickup that mainly scans the inner peripheral portion of the optical disc and a second optical pickup that mainly scans the outer peripheral portion of the optical disc, and the first optical pickup during the spin-up process started after the optical disc is mounted The disc information of the inner peripheral portion is read via the optical disc and the disc information of the outer peripheral portion is read via the second optical pickup.

  According to this configuration, even when the disc information recorded on the inner and outer peripheral portions of the optical disc is read, each disc information can be read separately using two optical pickups, and the spin-up processing time is shortened. A possible optical disk device can be obtained.

  According to the present invention, in the optical disc apparatus configured as described above, the first and second optical pickups each include a drive unit and can be independently driven, and are connected to a collective control unit. . According to this configuration, it is possible to stably and simultaneously read the disc information of the inner and outer peripheral portions of the optical disc. Therefore, the spin-up process for the inner peripheral part and the outer peripheral part of the optical disc can be executed simultaneously, and the spin-up process time can be shortened.

  According to the present invention, in the optical disk apparatus having the above-described configuration, the scanning areas of the first and second optical pickups are wrapped. According to this configuration, reading errors at the boundary between the first and second optical pickups can be completely prevented.

  According to the present invention, in the optical disc apparatus configured as described above, the first information read by the first optical pickup and the second information read by the second optical pickup can be simultaneously output. According to this configuration, at the time of playback operation, the information acquired by the two optical pickups is output in a lump, and these two pieces of information are displayed separately on the two divided screens, and are superimposed on one screen. Is also possible.

  According to the present invention, the first optical pickup that mainly scans the inner peripheral portion of the optical disc and the second optical pickup that mainly scans the outer peripheral portion of the optical disc are provided, and the spin-up process is started after the optical disc is mounted. In addition, since the disc information of the inner peripheral portion is read through the first optical pickup and the disc information of the outer peripheral portion is read through the second optical pickup, an optical disc apparatus capable of shortening the spin-up processing time is obtained. Can do.

1 is a schematic explanatory diagram of an optical disc apparatus according to the present invention. It is a schematic explanatory drawing which shows the modification of the optical disk apparatus based on this invention. It is a flowchart which shows the operation | movement of a spin-up process. It is a schematic explanatory drawing which shows the principal part structure of an optical pick-up.

  Embodiments of the present invention will be described below with reference to the drawings. Moreover, the same code | symbol is used about the same structural member, and detailed description is abbreviate | omitted suitably.

  The optical disk apparatus 1 of the present embodiment is an apparatus that records or reproduces data by irradiating an optical disk 20 with laser light using an optical pickup P. As shown in FIG. 1, a spindle motor 30 that rotates the optical disk 20 is used. The first optical pickup P1 that mainly scans the inner peripheral portion A of the optical disc 20 and the second optical pickup P2 that mainly scans the outer peripheral portion B of the optical disc 20 are provided.

  Further, the first control unit 14A included in the first optical pickup P1 and the second control unit 14B included in the second optical pickup P2 are connected to the collective control unit 40, and the spindle motor 30 is connected via the collective control unit 40. Driving is performed so that the driving of the first and second pickups P1 and P2 can be collectively controlled.

  Therefore, at the start of reproduction of the optical disc 20, the first optical pickup P1 is used to spin up the inner peripheral portion A of the optical disc 20, and at the same time, the second optical pickup P2 is used to spin the outer peripheral portion B of the optical disc 20. Up processing can be performed. In addition, it is possible to perform the reproduction process of the inner peripheral portion A of the optical disc 20 using the first optical pickup P1, and to perform the reproduction process of the outer peripheral portion B of the optical disc 20 using the second optical pickup P2.

  Even when the reproducing process is performed, the first optical pickup P1 that mainly scans the inner peripheral portion A of the optical disc 20 and the second optical pickup P2 that mainly scans the outer peripheral portion B of the optical disc 20 are provided. Since the collective control is possible via the collective control unit 40, it is possible to reproduce the recorded data continuously from the inner peripheral portion A to the outer peripheral portion B accurately and continuously.

  Next, the configuration of the optical pickup will be described with reference to FIG. The optical pickup P (P1, P2) includes a laser diode 2 serving as a light source, a polarizing beam splitter 3, a collimating lens 4, a rising mirror 5, a quarter wavelength plate 6, an objective lens 7, and a cylindrical lens. 8 and a photodetector 9, and the laser light is condensed on the recording surface 20 a of the optical disk 20 using the objective lens 7.

  The laser diode 2 is a semiconductor laser that emits laser light having a predetermined wavelength, and is selected corresponding to the optical disk 20. Further, although shown as an optical pickup P (P1, P2) including one laser diode 2 corresponding to one type of optical disk 20, light having a plurality of laser diodes 2 corresponding to a plurality of types of optical disks 20 is illustrated. It may be a pickup P (P1, P2).

  The polarizing beam splitter 3 has a function of transmitting one of two linearly polarized lights whose polarization directions are orthogonal to each other and reflecting the other linearly polarized light, transmits the laser light emitted from the laser diode 2, and reflects the optical disk 20 The laser beam thus reflected is reflected toward the photodetector 9. The photodetector 9 converts optical information contained in the received laser light into an electrical signal.

  The collimating lens 4 has a function of converting incident laser light into parallel light. In addition, the collimating lens 4 is incorporated in the collimating lens driving unit 10 so as to be movable in the optical axis direction, and the spherical aberration correcting mechanism 11 is configured to adjust the convergence / divergence state of the laser light passing through the collimating lens 4. .

  The raising mirror 5 reflects the laser beam sent from the collimating lens 4 toward the optical disc 20. The quarter-wave plate 6 has a function of converting linearly polarized light into circularly polarized light and converting circularly polarized light into linearly polarized light, and converts the linearly polarized laser light reflected by the rising mirror 5 into circularly polarized light. Then, the circularly polarized laser light incident on the objective lens 7 and reflected from the optical disk 20 is converted into linearly polarized light and incident on the collimating lens 4 from the rising mirror 5.

  The objective lens 7 condenses the laser light and irradiates the recording surface 20 a of the optical disk 20, receives the laser light reflected from the recording surface 20 a and makes it incident on the quarter-wave plate 6.

  The objective lens 7 has a function of condensing the laser light as a spot on the recording surface 20a of the optical disc 20, but is a lighter weight than a glass lens, and uses a plastic lens that can be mass-produced and is inexpensive. It is preferable.

  Further, for example, both the objective lens 7 and the quarter wavelength plate 6 are mounted on the actuator 12 so as to be movable in the focus direction and the tracking direction.

  The actuator 12 is a wire support type actuator that supports a lens holder on which the objective lens 7 is mounted via a plurality of conductive support wires in a swingable manner, and serves as a base serving as a fixed portion of the optical pickup. On the other hand, it is configured to be freely displaceable. In addition, a coil part having a focus coil and a tracking coil is provided on the lens holder side which is a movable part, and a magnetic field generating part for applying a magnetic field to the coil part is provided on the base side, so that power of a predetermined voltage is supplied via a support wire. By applying to the coil portion, the objective lens 7 can be displaced by a predetermined amount by the electromagnetic force action between the coil portion and the magnetic field generating portion. That is, focusing adjustment, tracking adjustment, and tilt adjustment can be performed by adjusting the magnitude and direction of the current supplied to each coil.

  The cylindrical lens 8 has a function of giving astigmatism to the laser light reflected from the recording surface 20a of the optical disc 20, and this astigmatism can be used for focus error detection.

  The electrical signal output from the photodetector 9 is sent to the signal processing unit 13. The signal processing unit 13 processes the electrical signal received from the photodetector 9 to generate an RF signal, a focus error signal (FE signal), a tracking error signal (TE signal), and the like. Information is read by the RF signal, and focusing control and tracking control are performed based on the FE signal and the TE signal.

  The control unit 14 (14A for the first optical pickup P1 and 14B for the second optical pickup P2) has a function of controlling the entire operation of the optical pickup P (P1, P2). For example, control of the laser diode drive circuit 15, control of the spherical aberration correction mechanism 11, control of the actuator 12 described above, and the like are performed.

  Further, a thermistor 16 is disposed on a substrate provided with a laser diode drive circuit 15, and the light output of the laser diode 2 is controlled from temperature information from the thermistor 16. Further, the temperature of the objective lens 7 is recognized from the temperature information of the thermistor 16, and the temperature characteristic of the objective lens 7 is corrected according to the obtained temperature.

  The control of the spherical aberration correction mechanism 11, which is one of the controls for correcting the temperature characteristics of the objective lens 7, can be performed by the control unit 14 receiving information from the signal processing unit 13, but as described above, The temperature of the objective lens 7 can be recognized from the temperature information of the thermistor 16 and can be performed according to the recognized temperature. Further, these can be combined, and predetermined correction control can be performed from the temperature information of the thermistor 16, and then fine adjustment can be performed using a signal from the signal processing unit 13.

  At the start of reproduction of the optical disc 20, the optical disc 20 is started up, the type of the optical disc 20 is discriminated, a control parameter corresponding to the discriminated type of the optical disc 20 is determined, and the optical pickup P (P1) is determined according to the recording state of the disc. , P2) is set to the initial position, and the spin-up process is executed, and then the reproduction is started.

  Therefore, since it is necessary to execute the spin-up process over the entire radial direction of the optical disk 20, in this embodiment, the inner peripheral portion of the disk is mainly scanned in order to shorten the time of the spin-up process. As a configuration in which the first optical pickup P1 and the second optical pickup P2 that mainly scans the outer peripheral portion of the disc are provided, the spin-up process is started after the optical disc 20 is mounted. The disc information of the peripheral portion A is read, and the disc information of the outer peripheral portion B is read via the second optical pickup P2.

  The discriminating between the inner peripheral portion A and the outer peripheral portion B of the disc can be made based on the data area and address information. However, it is easier to discriminate by the radius region corresponding to the disc size. In the embodiment, in consideration of both the disk having a diameter of 12 cm and the disk having a diameter of 8 cm, the region up to a radius of 40 mm is controlled as the inner peripheral portion A, and the other region is controlled as the outer peripheral portion B. This area is not particularly limited, and can be appropriately set according to the disk size.

  With the above configuration, the spin-up process executed at the start of reproduction of the optical disc 20 is executed via the first optical pickup P1 at the inner peripheral portion A of the disc, and the second optical pickup P2 at the outer peripheral portion B of the disc. The spin-up processing time can be shortened. Further, since the first optical pickup P1 can be arranged in advance close to the inner peripheral portion A and the second optical pickup P2 can be arranged in advance close to the outer peripheral portion B, the scanning movement of each optical pickup can be performed. The distance is shortened, and the time until the start of reproduction can be further shortened.

  Moreover, as shown in FIG. 2, it is good also as a structure which wraps the scanning area | region of a 1st, 2nd optical pick-up. For example, the scanning region of the first optical pickup P1 is set as the inner peripheral portion A1, and the scanning region of the second optical pickup P2 is set as the outer peripheral portion B1, and a lap region C where the scanning regions overlap is provided. This configuration is preferable because it can completely prevent a reading error at the boundary between the first and second optical pickups.

  Further, when the disc information including necessary control information can be acquired by scanning only the inner peripheral portion of the disc, the spin-up process for scanning only the first optical pickup P1 may be performed. First, the first optical pickup P1 is scanned to check the address where the disc information that needs to be confirmed is recorded from the control information recorded on the inner periphery of the disc, and then the second optical pickup P2 May be configured to scan and move.

  For example, as shown in the flowchart of FIG. 3, when the reproduction operation is started, each of the inner peripheral OPU (corresponding to the first optical pickup P1) and the outer peripheral OPU (corresponding to the second optical pickup P2) is performed in step S1. Perform automatic adjustment. Then, in step S2, the disc information recorded on the inner peripheral portion of the disc is read (read), the address where the disc information including the control information is recorded is confirmed, and whether or not the disc information is only the inner peripheral portion. If only the inner peripheral portion is determined (in the case of YES), the disk information is read (read) by scanning the inner peripheral OPU (first optical pickup P1) in step S3. If it is determined in step S2 that the disc information is recorded not only on the inner peripheral portion but also on the outer peripheral portion (in the case of NO), the outer peripheral OPU (second optical pickup P2) in step S4 is used. Scan (read) disk information.

  As described above, in the optical disc apparatus that irradiates the signal recording surface of the optical disc 20 with the laser beam, receives the reflected light from the signal recording surface, and reproduces the recording signal on the optical disc, the inner peripheral portion of the optical disc is mainly used. And a second optical pickup that mainly scans the outer peripheral portion of the optical disc, and the inner circumference passes through the first optical pickup during the spin-up process started after the optical disc is mounted. By reading the disc information of the portion and reading the disc information of the outer peripheral portion via the second optical pickup, an optical disc apparatus capable of shortening the spin-up processing time can be obtained.

  In addition, the first and second optical pickups P1 and P2 of the present embodiment are each provided with a driving unit and can be driven independently, and are connected to the collective control unit. Record information can be acquired. For this purpose, when reproducing recorded information, the first information read by the first optical pickup P1 and the second information read by the second optical pickup P2 are output simultaneously, and two different information are displayed on one screen. be able to.

  Also, when displaying two different information on one screen, the information acquired by the two optical pickups can be controlled simultaneously by the collective control unit, so these two information can be divided into two divided screens respectively. They can be displayed separately or superimposed on one screen.

  As described above, according to the optical disc apparatus of the present invention, it is possible to obtain an optical disc apparatus that can shorten the spin-up processing time that is performed when the optical disc is loaded.

  Furthermore, since the first information read by the first optical pickup and the second information read by the second optical pickup can be output simultaneously via the collective control unit, the information acquired by the two optical pickups during the reproduction operation Can be output in a lump, and these two pieces of information can be displayed separately on two divided screens, and can also be displayed superimposed on one screen.

  Therefore, the optical disc apparatus according to the present invention can be suitably applied to an optical disc apparatus that is desired to increase the startup time at the start of reproduction in a DVD player, a DVD recorder, or the like.

DESCRIPTION OF SYMBOLS 1 Optical disk apparatus 20 Optical disk 40 Collective control part P Optical pick-up P1 1st optical pick-up P2 2nd optical pick-up A Inner peripheral part (disc)
B Outer part (disc)
C lap area

Claims (4)

In an optical disc apparatus that irradiates a signal recording surface of an optical disc with laser light, receives reflected light from the signal recording surface, and reproduces a recording signal on the optical disc.
A first optical pickup that mainly scans the inner peripheral portion of the optical disc, and a second optical pickup that mainly scans the outer peripheral portion of the optical disc,
In the spin-up process started after the optical disc is mounted, the disc information of the inner peripheral portion is read via the first optical pickup, and the disc information of the outer peripheral portion is read via the second optical pickup. An optical disc apparatus characterized by that.   2. The optical disc apparatus according to claim 1, wherein the first and second optical pickups each include a driving unit and can be independently driven, and are connected to a collective control unit.   3. The optical disk apparatus according to claim 1, wherein the scanning areas of the first and second optical pickups are wrapped.   4. The optical disc apparatus according to claim 1, wherein the first information read by the first optical pickup and the second information read by the second optical pickup can be output simultaneously.

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