JP2006040470A - Information recording / reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an information recording / reproducing apparatus capable of recording and reproducing data by optically arranging optical pickups on both surfaces of an optical disk.
SOLUTION: A first optical pickup 13 that is disposed opposite to a first surface of an optical disk held by a spindle motor 7 that holds and rotates the optical disk and that irradiates a first laser beam, and the first optical pickup. 13 and a second optical pickup 15 which is disposed substantially symmetrically between the optical disk and irradiates a second laser beam on a second surface provided on the opposite side of the first surface of the optical disk, and first and second A feed mechanism base 25 having a rotation motor 19 for rotating the first and second optical pickups 180 degrees or more about the tangential direction of the track on the optical disk as an axis, and the first and second optical pickups. And a transfer means 23 for transferring the pickup in the radial direction of the optical disk.
[Selection] Figure 1

Description

  The present invention relates to an optical disk apparatus that records and reproduces data with respect to an optical disk using an optical pickup, and more particularly to an apparatus that records and reproduces data by optically arranging optical pickups on both sides of the optical disk.

  As is well known, in recent years, an optical disk having a single-layer capacity of 4.7 GB has been put to practical use as an optical disk capable of recording information at high density. For example, there are a DVD-ROM (Digital Versatile Disk-Read Only Memory), a DVD-RW (Rewritable), a DVD-RAM (Random Access Memory), etc., which are read-only optical disks. These optical discs are loaded in an information recording / reproducing apparatus, and irradiated with a laser beam having a relatively short wavelength by an optical pickup, so that information can be recorded or reproduced.

By the way, recently, in response to a request for performing a high-speed recording operation, an information recording / reproducing apparatus in which two optical pickups are arranged on both sides of an optical disc so that data recording / reproducing operation can be performed simultaneously on both sides of the optical disc has been put into practical use. . In particular, in Japanese Patent Laid-Open No. 2001-43548, the first and second optical pickups are arranged on both surfaces of the optical disk held by the disk rotation mechanism, and each is transported in the radial direction of the optical disk by the transport mechanism. An optical disk device that records and reproduces data on both sides of an optical disk simultaneously or separately is described.
JP 2001-043548 A (paragraph number 0016)

  If one optical pickup is used for recording and playback of various optical disks that support lasers with different wavelengths such as infrared, red, and blue, the optical pickup has an overwhelming performance due to its complicated optical system design including multiple lasers. As a result, the manufacturing cost of the entire apparatus increases. Therefore, if a plurality of optical pickups having different specifications are used to cope with various optical disks, there is a problem that the entire apparatus becomes large.

  According to the technique described in Patent Document 1, an optical pickup that performs recording / reproduction on the lower surface and an optical pickup that performs recording / reproduction on the upper surface are arranged above and below the optical disk, and seeks along the feed screw shaft. The operation is performed, and data is recorded and reproduced on the entire optical disk.

  However, it is difficult to perform the simultaneous recording operation and the simultaneous reproduction operation on both surfaces of the optical disk only by arranging the optical pickups above and below in this way. In particular, in the DVD standard, it is determined to rotate counterclockwise when viewed from the laser light irradiation side, and it is practically impossible to perform recording and reproduction simultaneously with the upper and lower optical pickups. Therefore, if the optical pickups are simply arranged above and below, the number of parts such as the optical pickup feeding mechanism and the like are increased and the arrangement space is increased, resulting in a problem that miniaturization cannot be achieved.

  Accordingly, the present invention has been made to solve the above problems, and provides an information recording / reproducing apparatus capable of recording and reproducing data by arranging optical pickups on both sides of an optical disk so as to be rotatable. To do.

In order to solve the above-described problems, the present invention includes a rotation driving unit that holds and rotates an optical disc, and a first laser beam that is disposed to face the first surface of the optical disc held by the rotation driving unit. A first optical pickup to irradiate, and a second laser disposed on a second surface provided on the opposite side of the first surface of the optical disc, which is disposed substantially symmetrically with the first optical pickup and the optical disc in between. A second optical pickup for irradiating light and the first and second optical pickups are held, and the first and second optical pickups are rotated by 180 degrees or more about the tangential direction of the track on the optical disc as an axis. A feed mechanism base having rotating means;
A transfer means for transferring the first and second optical pickups held by the feed mechanism base in the radial direction of the optical disc, and when the first and second optical pickups are alternately rearranged. Is characterized in that the first and second optical pickups are transported further outward than the outermost periphery of the optical disc by the transport means.

  According to the present invention, in addition to the conventional optical pickup using an infrared laser or a red laser, an optical pickup using a blue laser is incorporated, and a mechanism capable of switching a plurality of optical pickups is provided. Therefore, it is possible to provide an information recording / reproducing apparatus corresponding to various optical disk media.

  In addition, by using a common disk loading mechanism, the entire apparatus can be reduced in size even in an apparatus having a plurality of optical pickups.

  Further, by arranging optical pickups at the top and bottom and allowing the spindle motor to rotate in the reverse direction, even a double-sided type optical disk can be recorded and reproduced without turning the disk over.

  Further, the mechanism for switching the two optical pickups by rotating the upper and lower optical pickups around the tangential direction of the data track of the optical disc is the best angle for the optical pickup and the disc during data reproduction or recording using the same mechanism. It is possible to provide a function of adjusting so that In general, an optical disk made of a resin material is often warped in the radial direction, and it is not preferable in terms of the characteristics of the optical pickup that the inclination changes with respect to the optical pickup. Therefore, the mechanism that adjusts the relative angle with the recording surface of the disk as the center of rotation is an adjustment that does not affect the working distance of the objective lens of the optical pickup, and is therefore an ideal adjustment method.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a perspective view showing an entire information recording / reproducing apparatus according to an embodiment of the present invention. FIG. 2 is a perspective view showing a part of the information recording / reproducing apparatus. FIG. 3 is a perspective view of the information recording / reproducing apparatus showing a state in which the optical disk is drawn into the apparatus. FIG. 4 is a cross-sectional view of the information recording / reproducing apparatus showing a state in which the optical disk is drawn into the apparatus. 5 is a cross-sectional view taken along the line AA in FIG.

  As shown in FIGS. 1 and 2, the information recording / reproducing apparatus includes a disc tray 5 on which a disc cartridge 3 is placed, a spindle motor 7 that rotates the optical disc 1, a disc clamper 9 that clamps the optical disc 1, and a disc. A disk tray holder 11 for holding the tray 5, a first optical pickup 13 capable of recording / reproducing a high-density recording disk using a blue laser having a relatively short wavelength, and a red laser or infrared having a relatively long wavelength A second optical pickup 15 having a function of a CD or DVD using a laser, or both, an optical pickup holder 17 for holding the first or second optical pickups 13, 15, and the first optical pickup 13. And an optical pickup that rotates the second optical pickup 15 180 degrees about a predetermined rotation axis. An optical pickup feed guide shaft 21 connected to the rotation motor 19 and the optical pickup rotation motor 19 for guiding the first and second optical pickups 13 and 15 in the inner and outer peripheral directions of the optical disc 1, and actually the first An optical pickup feed motor 23 for moving the first and second optical pickups 13 and 15 to the inner and outer peripheries of the optical disc, a lead screw 22 that rotates in accordance with the rotation, an optical pickup rotating motor 19, and the first and first optical pickups. It is composed of a feed mechanism base 25 connected to the two optical pickups 13 and 15 and slidably connected to the optical pickup feed guide shaft 21 and a frame 27 as a housing.

  1 and 2 show a mechanism for loading an optical disk 1 built in a disk cartridge 3 onto a turntable of a spindle motor 7 and first and second upper and lower optical pickups 13 and 15 of the optical disk 1. An embodiment of the present invention constituted by a mechanism for moving in the radial direction and a mechanism capable of rotating the first and second optical pickups 13 and 15 by 180 degrees or more about the tangent to the recording track of the optical disc 1 is shown. ing. FIGS. 1 and 2 show a state before the optical disk 1 is loaded, and the disk cartridge 3 is placed on the disk tray 5. The disc tray 5 is placed in the disc tray holder 12 and the disc tray 5 at the same time as it is pulled into the apparatus along the left and right disc tray holders 11 and 12 by a drive mechanism arranged below the tray (not shown). The shutter of the disk cartridge 3 is opened by a mechanism not shown. The optical disk 1 inside the disk cartridge 3 is exposed on both the upper and lower surfaces. At this time, the spindle motor 7 for rotating the optical disk 1 and the disk clamper 9 for sandwiching the optical disk 1 between the turntables of the spindle motor 7 are retracted up and down. ing. When the disk cartridge 3 is pulled to a predetermined position, the spindle motor 7 and the disk clamper 9 that have been retracted vertically are sandwiched by a mechanism (not shown) and are constrained so that they can rotate within a predetermined plane.

  On the other hand, as shown in FIGS. 3 to 5, the first optical pickup 13 and the second optical pickup 15 that can read data on the optical disc 1 are attached to an optical pickup holder 17. Has a structure in which the entire disk cartridge 3 and disk tray holder 11 can be inserted. A first optical pickup 13 and a second optical pickup 15 are arranged inside the optical disc 1 so as to face each other with the optical disc 1 interposed therebetween.

  The position of the optical pickup holder 17 is accurately attached to the exposed portion of the loaded optical disk 1 so that the first and second optical pickups 13 and 15 can read data on the upper and lower surfaces of the optical disk. . Further, the optical pickup holder 17 is a mechanism that can be moved in the radial direction within the disk surface by the optical pickup feed motor 23.

  The range in which the feed mechanism base 25 can be moved is from the position where the optical pickup reaches the innermost circumferential position of the optical disc with the disc cartridge 3 and the disc tray holder 11 inserted, from the disc cartridge 3 and the disc tray holder 11. It is up to the state of slipping out (range of arrow C in FIG. 3). In the state where the disc cartridge 3 and the disc tray holder 11 are completely removed, the optical pickup holder 11 can rotate 180 degrees around the rotation axis shown in the figure. Therefore, the first optical pickup 13 and the second optical pickup 15 can be exchanged up and down at a position where the disc tray 5 does not get in the way. This rotating shaft moves together with the feed mechanism base 25, but when it is at a position in the optical disk 1 surface close to the disk motor 7, it is roughly within the recording surface of the optical disk and the first and second optical pickups 13, There is a relationship that almost coincides with the tangent line of the recording track at 15 laser irradiation positions.

  Here, the first optical pickup 13 is an optical pickup capable of recording and reproducing a high-density recording disk using a blue laser having a relatively short wavelength, and the second optical pickup 15 is a CD using a red laser or an infrared laser. Alternatively, it is an optical pickup having a DVD function or both functions.

  In addition, the first and second optical pickups 13 and 15 or the optical pickup holder 17 are provided with tilt sensors (not shown) that detect the tilt of the optical disc 1, and the first and second optical pickups 13, While the optical disk 15 is recording or reading data on the optical disk 1, the relative angle between the first and second optical pickups 13 and 15 and the optical disk 1 is determined by the mechanism of rotating the optical pickup holder 17 and the signal of the tilt sensor. It has a function that is controlled to be an angle. As shown in FIG. 4, the first and second optical pickups 13 and 15 are controlled so that the relative angle with respect to the optical disk 1 is always constant by slightly moving in the direction of the arrow.

  In the case of an optical disc of a type in which data is recorded on both sides, when reproducing data on the side opposite to the turntable side of the spindle motor 7, the spindle motor 7 can be rotated in the reverse direction. That is, in the DVD standard, it is standardized to rotate counterclockwise as viewed from the laser light irradiation side. Thus, if the spindle motor 7 can be rotated in the reverse direction, the user does not have to perform an operation of turning the optical disc over and inserting it.

  Further, the feed mechanism of the first and second optical pickups 13 and 15 is a feed mechanism using the lead screw 22, but feed by a spur gear or belt drive may be used. Further, the disk to be handled may be a bare disk that is not built in the disk cartridge 3, and does not need to be a tray type disk loading mechanism.

  In addition, this invention is not limited to the said embodiment, In the implementation stage, it can change variously in the range which does not deviate from the summary.

1 is a perspective view showing an entire information recording / reproducing apparatus according to an embodiment of the present invention. The perspective view which shows a part of information recording / reproducing apparatus. The perspective view of the information recording / reproducing apparatus which shows the state by which the optical disk was drawn in the inside of an apparatus. Sectional drawing of the information recording / reproducing apparatus which shows the state by which the optical disk was drawn in the inside of an apparatus. AA sectional drawing of FIG.

Explanation of symbols

1 optical disc 3 disc cartridge 5 disc tray 7 spindle motor 9 disc clamper 11 disc tray holder 13 first optical pickup 15 second optical pickup 17 optical pickup holder 19 optical pickup rotating motor 21 optical pickup feed guide shaft 22 lead screw 23 Optical pickup feed motor 25 Feed mechanism base 27 Frame

Claims (5)

A rotation driving means for holding and rotating the optical disc;
A first optical pickup which is disposed opposite to the first surface of the optical disk held by the rotation driving means and which irradiates a first laser beam;
A second optical pickup that is disposed at a substantially symmetrical position across the first optical pickup and the optical disc, and irradiates a second laser beam on a second surface provided on the opposite side of the first surface of the optical disc. When,
A feed mechanism base having holding means for holding the first and second optical pickups and rotating the first and second optical pickups by 180 degrees or more about a tangential direction of a track on the optical disc;
Transporting means for transporting the first and second optical pickups held on the feeding mechanism base in the radial direction of the optical disc;
When the first and second optical pickups are alternately rearranged, the first and second optical pickups are transferred further outward than the outermost periphery of the optical disc by the transfer means. Information recording / reproducing apparatus.   The information recording / reproducing apparatus according to claim 1, wherein the first optical pickup emits blue laser light having a relatively short wavelength.   2. The information recording / reproducing apparatus according to claim 1, wherein the second optical pickup irradiates a red laser beam or an infrared laser having a relatively long wavelength.   2. The information recording / reproducing apparatus according to claim 1, wherein each of the first and second optical pickups includes a tilt sensor so as to correct the warp of the optical disc during recording or reproduction. The information recording / reproducing apparatus according to claim 1, wherein the rotation driving unit is also capable of reverse rotation driving.

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