JPH1196589A - Optical disk driving device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical disk driving device capable of driving two kinds of different optical disks by properly selecting them. SOLUTION: The reproducing or the recording and reproducing of an optical disk 7 is performed by providing a first optical pickup 10a reproducing or recording and reproducing a first optical disk and a second optical pickup 10b reproducing or recording and reproducing a second optical disk whose kind is different from that of the first optical disk and by arranging the first and second optical pickups 10a, 10b so as to be placed at positions of point symmetry with respect to the axis of the rotation of the optical disk 7 and by making them movable with a single slide feeding mechanism and by using the optical pickup of one side suited for an optical disk to be mounted on this device. Since, for example, the general optical pickup specialized for a CD and the optical pickup specialized for a DVD which are available at inexpensive costs can be used as the first and second optical pickups 10a, 10b, it is unnecessary to design complex optical pickups newly.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disk drive, and more particularly, to an optical disk drive capable of reproducing, recording and reproducing different types of optical disks.

[0002]

2. Description of the Related Art An optical disk holds information recorded by a large number of pits formed in a spiral shape on a signal surface (recording surface). In an optical disk drive for reproducing this optical disk, a signal surface (recording surface) is irradiated with a laser beam from an optical pickup, and information recorded on the signal surface is reproduced through a change in light intensity of reflected light of the laser beam. It has become.

As such optical disks, compact disks (CDs) and CD-ROMs have been widely used, but recently, writable CD-Rs have been used.
(CD-Recorable) and writable and erasable (CD-Rewri
table) have been developed, and digital video discs (DVD), DVD-ROM, DVD-RAM
Such new recording media have been developed.

Since these optical disks have the same outer size (12 cm), it is desirable to be able to reproduce, record and reproduce with a common optical disk drive (optical disk drive). In particular, recently, the use of these optical discs as a recording medium for computers has been expanding with the increase in the capacity of computer data, and it has been necessary to enable reproduction or recording / reproduction with a common optical disc drive. Is effective.

[0005] However, for example, a CD (CD-RO
M) and DVD have different wavelengths, recording densities, disk thicknesses, and the like, so that there is a problem that DVD cannot be reproduced with an optical pickup for CD. Therefore, several methods have been devised in order to enable one drive to handle such different recording media. For example, there is a type that uses a single wavelength used for DVD and has an objective lens having a double focus function, and a type that controls a spot diameter by changing an aperture diameter. However, these optical pickups have a problem that the structure and control are complicated and the manufacturing cost is high.

Further, since an organic dye is used on the recording surface of the CD-R, a laser wavelength for DVD (65) is used.
Attempting to reproduce a CD-R at 0 nm) involves the problem that light is absorbed and cannot be reproduced. Therefore, an optical pickup configured to be capable of irradiating two different wavelengths of laser beams with a single optical system and a configuration in which two types of dedicated optical pickups are arranged close to each medium have been proposed.

However, the former method has a problem in that the beam control system is complicated, and the latter method has a problem in that the design of the optical pickup and the structure of the drive around the optical pickup are complicated, and the manufacturing cost is increased.

On the other hand, for the most common CDs, many optical pickups that are inexpensive and have good performance are produced.
At present, it is easily available.

For this reason, it is easier to manufacture a new optical pickup for a DVD or the like than an existing optical pickup for a CD, rather than designing a new optical pickup that can support different optical disks, and the manufacturing cost is further increased. Goes up cheaply.

[0010]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems in the conventional optical disk drive, and provides an optical disk drive capable of coping with different optical disks with a simple structure. The purpose is to do.

[0011]

To achieve the above object, the present invention provides a method for selectively reproducing or reproducing a first optical disc and a second optical disc of a type different from the first optical disc. in the recording and reproducing optical disk drive apparatus, the first optical pickup and the recording and reproducing information on the first reproduction or the first optical disk the information recorded on the optical disk; recorded on the second optical disk A second optical pickup for reproducing the read information or recording / reproducing the information on the second optical disc, wherein the first and second optical pickups are symmetrical with respect to the rotation center axis of the optical disc. While placing it so that it is in the position,
The optical disc is reproduced or recorded / reproduced using one of the optical pickups suitable for the loaded optical disc.

According to the optical disk driving apparatus of the present invention configured as described above, if the first optical pickup is driven while the first optical disk is inserted and rotated, the first optical disk is driven. It can be reproduced or recorded / reproduced. Further, if the second optical pickup is driven while the second optical disc is inserted and rotated, the second optical pickup is driven.
Can be reproduced or recorded / reproduced. That is, two types of optical disks having different driving modes can be driven by one driving device. In this case, if a commercially available dedicated type optical pickup is used as each of the first optical pickup and the second optical pickup, it is not necessary to manufacture a new pickup, and the manufacturing cost can be reduced. .

[0013] The optical disk device may include the first and second optical disks.
It is preferable that the optical pickup is configured to be movable in the radial direction of the optical disk by a single feed mechanism. In this case, when the first optical pickup is located on the inner peripheral side of the optical disk, the second optical pickup is located on the outer peripheral side of the optical disk.

According to this structure, only one slide feed mechanism of the optical pickup is required, and even if two optical pickups are provided, the number of parts increases and the production cost does not increase.

The present invention also provides an optical disk drive capable of selectively reproducing or recording / reproducing one of a first optical disk and a second optical disk different from the first optical disk. A first optical pickup for reproducing information recorded on one optical disc or recording / reproducing information on the first optical disc; and reproducing information recorded on the second optical disc, or the second optical disc A second optical pickup for recording / reproducing information to / from the optical pickup;
Wherein the first and second optical pickups are slidably disposed on the same guide rod with a distance between the rotation center of the optical disk, and the optical disks of both optical pickups are driven by a single drive mechanism. The optical disc is reproduced or recorded / reproduced using either one of the optical pickups.

According to the optical disk drive having the above-described structure, the movement of both optical pickups is performed by a single drive mechanism, so that the structure of the drive mechanism can be simplified. Also in this case, if a commercially available dedicated type optical pickup is used as each of the first optical pickup and the second optical pickup, it is not necessary to manufacture a new pickup, and the manufacturing cost can be reduced. Become.

In the optical disk drive, preferably, when the first optical pickup is located on the innermost peripheral side of the disk, the second optical pickup is provided on the outermost peripheral side of the disk. The first optical pickup and the second optical pickup are mounted on a common drive base such that the respective objective lenses are located at symmetrical positions with respect to the rotation axis of the optical disk, and the drive base is rotated forward and backward. It is preferable to control the drive by a possible motor.

Further, the present invention is particularly suitable when the wavelength of the laser beam for recording / reproducing the first optical disk and the wavelength of the laser beam for recording / reproducing the second optical disk are different. For example, the first optical disc may be a CD-R and the second optical disc may be a DVD.

Other objects, configurations and effects of the present invention will become more apparent from the following description of the embodiments which is given based on the drawings.

[0020]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view showing the appearance of a personal computer (hereinafter, referred to as a personal computer) in which an optical disk drive of the present invention is built. Here, two types of optical disks, such as a CD-ROM or a CD-R, are used. Compact disc (CD) and digital video disc (DV
An optical disk drive capable of selectively driving D) will be described.

As shown, the computer main body 1 of the personal computer has a built-in optical disk drive of the present invention. This optical disk drive has a disk tray 2 on which an optical disk protrudable from the front of a computer main body 1 is placed. This disc tray 2
By operating the eject switch 3, it is possible to move between an ejection position where the optical disk protruding from the computer main body 1 can be attached and detached and a loading position accommodated in the main body 1 and capable of reproducing / recording operation. Has become.

This optical disk drive is provided with disk selecting means for selecting whether the inserted disk is one of the above two types of optical disks. As shown in the figure, the selection means may be provided with an optical disc selection switch 4 provided above the portion of the computer main body 1 where the disc tray 2 enters and exits, and selects one of two types of optical discs. it can. In this case, the switching operation of the selection switch 4 can be performed from the personal computer through software.

Although not shown, the above-mentioned disc selecting means may be configured such that the type of the inserted disc is automatically judged on the optical disc drive side instead of the selection switch 4. It is possible. For example, if the inserted disc can be reproduced by irradiating a 780 nm laser beam for a CD with a laser beam, the inserted disc is determined as a CD, and if it cannot be reproduced without a 650 nm beam for a DVD, it is determined as a DVD. Is mentioned. In the case of a manual operation selection switch,
When a CD-R disc is inserted, the disc may be damaged by accidentally hitting a 650 nm beam for DVD, but the disc type is automatically determined on the optical disc drive side in this way. If so, such a problem does not arise.

It is preferable that the computer main body 1 or the optical disk drive is provided with display means for displaying the type of the currently selected optical disk. The display means is, for example, as shown in FIG.
The display lamps 5a and 5b for displaying the type of the currently selected optical disk can be provided in front of the optical disk.

When it is desired to drive a CD using this personal computer, the CD is placed on the disk tray 2 and the eject switch 3 is operated to move the disk tray 2 into the computer main body 1. Then, after "CD" is selected by the disk selecting means as described above, a CD can be driven by inputting a drive signal from the personal computer side. If you want to drive a DVD,
Similarly, a DVD is placed on the disk tray 2 and the eject switch 3 is operated to move the disk tray 2 into the main body 1. Then, with the selection switch 4, "DV
After "D" is selected, the DVD can be driven by inputting a drive signal from the personal computer.

FIG. 2 is an explanatory diagram schematically showing the configuration of an optical disk drive according to one embodiment of the present invention.

As shown in the figure, in this optical disk drive, a turntable 8 for rotating and driving the inserted optical disk 7 is installed at a substantially central portion, and the optical disk 7 is rotated at a predetermined rotation speed by a spindle motor described later. Can be driven to rotate. Also,
A guide rod 9 formed of, for example, a metal rod is fixed to a side portion of the turntable 8, and the guide rod 9 has two optical pickups 10a and 10b.
Is slidably installed.

Although not specifically shown, each of the optical pickups 10a and 10b generally includes a pickup base slidably supported by the guide rod 9, an actuator base provided on the pickup base, and an actuator base. It comprises a damper base supported by the base, a lens holder supported by the damper base via a suspension spring, and objective lenses 11a and 11b provided in the lens holder. Further, inside the optical pickups 10a and 10b, an optical system such as a laser irradiation unit, a half mirror, a collimator lens, and a photodiode is housed. The light is irradiated onto the signal recording surface of the optical disk 7 via the meter lens and the objective lens, and the light reflected from the signal recording surface is guided to the photodiode via the objective lens, the collimator lens, and the half mirror. The information recorded on the recording surface is reproduced.

The optical pickups 10a and 10b
The lens holder is configured to be movable in the radial direction and the rotation axis direction of the optical disk via an actuator (not shown), and is configured to perform various servo controls such as tracking servo and focus servo.

In the illustrated example, each optical pickup 1
On the long piece of the side of the turn table 8 that faces the turntable 8, semi-circular cutouts 12a and 12b along the shape of the turntable 8 are formed. Although a pair of protrusions having through holes 13a and 13b through which the guide rod 9 is inserted are formed, it goes without saying that the optical pickup of the present invention is not limited to such a shape.

Each of the optical pickups 10a and 10b having the above-described configuration is mounted on a long rack 14 extending in parallel with the guide rod 9 at the tip end of a pair of protrusions formed with through holes 13a and 13b. Fixed. The rack 14 serves as a common drive base for the optical pickups 10a and 10b.

In this case, each of the optical pickups 10a, 10a
b indicates that each of the objective lenses 11a and 11b is positioned with respect to the rotation axis of the turntable 8 (the rotation center of the optical disc 7).
They are arranged at point-symmetric positions. That is, it is arranged so as to be located on the opposite side with respect to the rotation axis of the turntable 8. When one of the optical pickups 10a and 10b is closest to the turntable 8 (the state of the optical pickup 10b in the figure),
The other optical pickup (in this case, the optical pickup 1
0a) is located at the outermost peripheral portion of the optical disc 7,
It is arranged and fixed on the rack 14.

A pinion (worm wheel) 15 meshes with the rack 14, and a worm attached to an output shaft of a thread motor 16 meshes with the worm wheel 15. The sled motor 16 is configured to be rotatable in the forward and reverse directions. Therefore, by rotating the sled motor 16 in one direction, the rack 1
4 can be moved in the direction of arrow "Y1", and the rack 14 can be slid in the direction of arrow "Y2" by rotating the sled motor 16 in the opposite direction. As a result, each optical pickup 10
The a and b slide along the guide rod 9 such that the objective lenses 11a and 11b move in the radial direction of the optical disk.

The guide rod 9, the rack 14, the worm wheel 15, the thread motor 16 and the like constitute a slide feed mechanism 18 for sliding the optical pickups 10a and 10b.

FIG. 3 is a block diagram schematically showing a configuration of a control mechanism of the optical system of each of the optical pickups 10a and 10b and a rotation control mechanism for rotatingly driving the turntable 8 according to the present embodiment. As shown in the figure, the control mechanism includes a CD control system (part of the symbol "A" in the figure) that operates when a CD is used as an optical disc, and a D
A DVD control system that operates when the VD is used (part “B” in the figure) is roughly configured, and these control systems can be switched between operation and stop by a switching operation by the selection switch 4. ing.

The CD control system "A" generally comprises an RF amplifier 21 for amplifying information detected by the optical pickup 10a.
a, a CD signal processing unit 22a for reading CD information from the amplified information, and a servo processor 23a for controlling the tracking servo and focus servo of the objective lens 11a and controlling the rotation of the turntable 8
And EF for the signal output from the RF amplifier 21a
CD signal processing unit 22a for performing M demodulation and the like; control microcomputer (CPU) 24a for generally controlling servo processor 23a and the like; driver 26 for actually providing control signals to optical pickup 10a and spindle motor 17
and a D / A converter 25a for converting an audio signal obtained by the CD signal processing unit 22a into an analog signal
A CD-ROM decoder 27a for detecting a header and decoding an ECC (error correction code) for the EMF signal obtained by the CD signal processing unit 22a;
The signal from the ROM decoder 27a is transmitted to the computer 1
It is composed of an interface 28a for outputting to the side.

On the other hand, the DVD control system "B"
An RF amplifier 21 which is substantially the same as the D control system "A" and amplifies information detected by the optical pickup 10b.
b, DVD for reading DVD information from amplified information
A signal processor 22b and a servo processor 23b that controls the tracking servo and the focus servo of the objective lens 11b and controls the rotation of the turntable 8
, A DVD signal processing unit 22b, and a servo processor 23
b, a driver 26b for actually providing control signals to the optical pickup 10b and the spindle motor 17, and a DVD signal obtained by the DVD signal processing unit 22b to be converted into an analog signal. D / A converter 25b and DVD signal processing unit 22b
, A DVD decoder 27b for decoding the signal obtained in the above, and an interface 28b for outputting a signal from the DVD decoder 27b to the computer main body 1 side.

A thread motor control unit 29 is provided in common for the CD control system “A” and the DVD control system “B”. The thread motor control unit 29 controls the slide feed mechanism 18 according to a control command signal given from each of the servo processors 23a and 23b, and interlocks the two optical pickups 10a and 10b with each other as shown in FIG. Can be slid along the radial direction.

In the above embodiment, the respective circuit components are described as being separately provided in the CD control system "A" and the DVD control system "B". Needless to say, only one need be provided.

Next, the operation of the present embodiment configured as described above will be described. When a CD (compact disc) is inserted into the disc tray 2 shown in FIG. 1 and playback is performed, first, it is determined that "CD" has been inserted via any of the above-described disc selecting means. Then
The display lamp 5a is turned on to indicate that "CD" is currently inserted, and a signal indicating that "CD" has been selected is given to the control microcomputer 24a on the CD side shown in FIG. . Thereby, the thread motor control unit 2
The reference numeral 7 supplies a drive signal to the slide moving mechanism 18 so as to operate the objective lens 11a provided on the optical pickup 10a such that the laser beam irradiation position is located at the innermost circumference of the optical disk 7. That is, the sled motor 16 shown in FIG.
Is rotated so that the objective lens 11a comes to the innermost periphery of the optical disc 7 by moving the optical pickup 10a to the guide rod 9
Slide along. As a result, the optical pickup 10a for CD is located at the innermost peripheral portion of the optical disk 7, and conversely, the optical pickup 10b for DVD
Is located at the outermost periphery of the optical disk 7.

Then, in this state, a normal CD reproducing operation is performed. That is, a number of pits (irregularities) formed in a spiral shape on the surface of the optical disk 7 are
After irradiating laser light from a and detecting this reflected light, RF
The signal is amplified by the amplifier 21a. Then, this signal is sequentially converted to C
The D signal processing unit 22a performs EFM demodulation and the like to convert into a digital signal. If blurring occurs in the tracking direction and the focus direction during this reproducing operation, the servo processor 23a sequentially performs appropriate tracking servo and focus servo. In this way,
Even when a slight vibration or the like occurs, the CD information can be smoothly reproduced without causing a trouble such as a tracking error.

On the other hand, using the optical disk drive,
When reproducing a DVD, the DVD is placed and inserted on the placing table 2 shown in FIG. Then, it is determined that “DVD” has been inserted through any of the above-described disk selection means. Then, the "DVD" display lamp 5b is lit, indicating that "DVD" is currently inserted, and the control microcomputer 24b of the DVD control system "B" shown in FIG. 3 is driven. This allows
The sled motor control unit 29 drives the sled motor 16 to rotate so that the DVD optical pickup 10b is positioned at the innermost periphery of the optical disk 7 (see FIG. 2). Thereafter, although detailed description is omitted, an operation of reproducing a normal DVD is started to obtain DVD information.

As described above, in the optical disk drive of the present embodiment, one drive can be used to drive two different types of optical disks, for example, a CD and a DVD. An optical disk desired to be appropriately driven can be selected and reproduced. In addition, since optical pickups for CD and DVD, which are generally used, can be used as they are, there is no need to separately prepare a new pickup, and the cost is reduced, and failures and troubles occur. Even if it occurs, it can be procured immediately.
Further, since the two optical pickups 10a and 10b are slid by one thread motor 16, the number of components does not increase.

In the above embodiment, an example in which the optical disk drive is used for a personal computer has been described. However, for example, by applying the present invention to an audio CD player, it is possible to reproduce both a music CD and a DVD. It is. Furthermore, in the above-described embodiment, a CD and a DVD are described as examples of two different types of optical disks, but the present invention is not limited to this, and various types of optical disks can be used as long as the optical disks have the same size. For example, a CD-R and a DV can be used as two types of optical discs.
D, CD-R and DVD-R may be combined.

Finally, the present invention is not limited to the above embodiments, and it goes without saying that various improvements and modifications can be made within the scope described in the claims.

[0047]

According to the optical disk drive of the present invention described above, there is no need to develop a new pickup, and the existing CD-dedicated pickup and DVD-dedicated pickup can be used as they are, thereby reducing the manufacturing cost. be able to.

Further, since the slide feed mechanism of both optical pickups is used in common, one component such as a thread motor can be used.
The number of parts does not increase even if two optical pickups are provided.

[Brief description of the drawings]

FIG. 1 is a perspective view of a personal computer on which an optical disk drive of the present invention is mounted.

FIG. 2 is an explanatory diagram showing a schematic configuration of an optical disk drive of the present invention.

FIG. 3 is a block diagram showing the overall configuration of the optical disk drive of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Computer main body 2 Disc tray 3 Eject switch 4 Selection switch 7 Optical disk 8 Turntable 9 Guide rod 10a, 10b Optical pickup 11a, 11b Objective lens 14 Rack 18 Slide feed mechanism A CD control system B DVD control system

Claims (8)

[Claims] 1. An optical disk drive capable of selectively reproducing or recording / reproducing a first optical disk and a second optical disk of a type different from the first optical disk, wherein: A first optical pickup for reproducing recorded information or recording / reproducing information on the optical first disk; reproducing information recorded on the second optical disk or transmitting information on the second optical disk; A second optical pickup for recording / reproducing; and the first and second optical pickups are arranged so as to be symmetrical with respect to the rotation center axis of the optical disc, and suitable for an optical disc to be loaded. An optical disk drive device for reproducing or recording / reproducing the loaded optical disk by using one of the optical pickups. 2. The optical pickup according to claim 1, wherein the first and second optical pickups include:
2. The optical disk drive according to claim 1, wherein the optical disk drive is configured to be movable in a radial direction of the optical disk by a single feed mechanism. 3. The optical pickup according to claim 2, wherein said second optical pickup is located on an outer peripheral side of said optical disk when said first optical pickup is located on an inner peripheral side of said optical disk. An optical disk drive according to claim 1. 4. An optical disk drive capable of selectively reproducing or recording / reproducing a first optical disk and a second optical disk of a type different from the first optical disk, wherein: reproducing the recorded information, or the first optical pickup and the recording and reproducing information on the first optical disk; reproducing the information recorded on the second optical disc, or the information to the second optical disk A second optical pickup for recording / reproducing; wherein the first and second optical pickups are slidably arranged on the same guide rod at an interval with the rotation center of the optical disk therebetween. One drive mechanism controls the movement of both optical pickups in the radial direction of the optical disc, and reproduces or records / reproduces the optical disc using either optical pickup. Optical disk drive, which comprises carrying out. 5. The apparatus according to claim 1, wherein when the first optical pickup is located on the innermost peripheral side of the disk, the second optical pickup is provided on the outermost peripheral side of the disk. Item 5. An optical disk drive according to item 4. 6. The first optical pickup and the second optical pickup are mounted on a common drive base such that the respective objective lenses are located at point-symmetric positions with respect to the rotation axis of the optical disk, and 6. The drive control of the base by a motor capable of rotating forward and backward.
An optical disk drive according to claim 1. 7. The method according to claim 6, wherein the wavelength of the laser beam for recording / reproducing the first optical disk is different from the wavelength of the laser beam for recording / reproducing the second optical disk. Optical disk drive. 8. The optical disk drive according to claim 1, wherein the first optical disk is a CD-R, and the second optical disk is a DVD.