JP2891942B2 - Optical disk drive - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disk device in which a CD (Compact Disc) optical disk can be shared with an ISO standard optical disk device.

[0002]

2. Description of the Related Art At present, when an optical disk having a size of 5 inches is classified according to a physical shape and a recording / reproducing method, it is classified into a CD-type optical disk and an ISO standard optical disk.

[0003] CD-type optical disks include music CDs, data CD-ROMs containing code information, music and image CD-Vs, character information as well as still images, graphics, and audio. The CD-I and others that handle it have been put to practical use.

[0004] As shown in FIG.
The optical disc apparatus is configured by only a single optical disc, and is set in an optical disc apparatus by a mechanical clamp system in which the clamping area 2 of the optical disc 1 is mechanically held and connected to a spindle motor.

[0005] Between these CD optical disks,
Shapes and recording formats are unified and are compatible with each other. One optical disk device can set and play back various CD optical disks.

On the other hand, optical disks conforming to the ISO standard can be classified into a hole type, a phase change type, a magneto-optical type and the like according to a recording / reproducing method, and can be written by an optical disk device.

[0007] As shown in FIG.
The optical disc 3 is built in a dedicated cartridge 4 and a clamping hub 5 made of a magnetic material is attached to a clamping area, and a magnet chucking method is adopted.

[0008]

By the way, the above various types
Since the CD-type optical discs are compatible with each other, one CD-type optical disc device can be shared and reproduced, and between the ISO standard optical discs, one CD-type optical disc device can be used regardless of the recording / reproducing method. The recording / reproduction can be performed by sharing the optical disk device.

However, there is no compatibility between a CD-based optical disk and an ISO standard optical disk, so that at present, an optical disk device cannot be shared. Therefore, CD
If it is desired to use both optical discs of the CD system and the ISO standard, optical disc apparatuses of the CD system and the ISO standard are required.

[0010] Further, since the information pattern of a CD optical disk can be transferred by a stamper, the unit price can be reduced by mass production. Therefore, it is not suitable for high-mix low-volume production of optical disc software.

On the other hand, the optical disc of the ISO standard is recordable, so that it is possible to produce various kinds of software in small quantities.

[0012] Therefore, if a CD optical disk is constituted by a recordable medium and can be recorded / reproduced by an ISO standard optical disk device, it is possible to produce various kinds of CD optical disks at low cost and in small quantities.

A technical problem of the present invention is to realize an optical disk device capable of recording / reproducing a CD-type optical disk by sharing an ISO standard optical disk device, focusing on such a problem.

[0014]

The technical problem of the present invention is solved by the following means. According to the present invention, a sensor for identifying the first optical disk and the second optical disk from the identification means of the cartridge and a type of the optical disk are recognized based on an identification signal from the sensor, and the optical disk is determined to be the second optical disk. In the case, while controlling the light beam corresponding to the second optical disc, or controlling the rotation speed of the optical disc, or tracking control, or switching to demodulation control, when the second optical disc is ejected, An optical disk device comprising at least control means for controlling a light beam corresponding to the first optical disk, or controlling the rotation speed of the optical disk, or tracking control, or switching to demodulation control, Claim 2 is that the first optical disk is an optical disk conforming to the ISO standard. Characterized, according to claim 3, wherein the first optical disk, characterized in that the magneto-optical type, or a phase change type, according to claim 4
Is characterized in that the second optical disk is a CD-type optical disk.

When an optical disk cartridge as shown in FIGS. 2 and 3 is loaded and driven into the optical disk device having the above-described configuration, the sensor identifies the shape of the optical disk and recognizes the type of the recording / reproducing method. In the case of the optical disk, the control of the light beam, the control of the number of rotations of the optical disk, the tracking control, the demodulation control, and the like are switched to the CD system in accordance with the above-mentioned type. Recording / reproduction is possible by sharing with other optical discs.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of how the optical disk apparatus according to the present invention is actually embodied will be described. FIG. 1 is a principle diagram showing a state where a CD optical disk is loaded and recorded / reproduced by an optical disk apparatus according to the present invention.

In FIG. 1, reference numeral 1 denotes a CD optical disk, which is housed in an ISO standard cartridge 4. The cartridge 4 has identification means 6 for indicating that the optical disc 1 of the CD type is stored. Also CD
A magnetic hub 5 for magnet chucking is attached to the clamping area of the system optical disc 1.

In this way, the ISO standard cartridge 4
The optical disk 1 of the CD system stored in the optical disk drive can be recorded / reproduced by an optical disk device obtained by slightly modifying an ISO standard device. That is, a sensor 7 for detecting the cartridge identification means 6 is provided in the ISO standard optical disk device, and a control circuit 8 to which a detection signal of the sensor 7 is input is provided.

Further, this optical disk apparatus has a spindle motor rotation speed switching means and a tracking control method switching means for switching between a CD system optical disk and an ISO standard optical disk. Done by

H is an optical head, M1 is a spindle motor, M2 is a drive motor for the optical head H, M3 is a loading motor for taking in and out of the cartridge, and 9 is a signal processing circuit.

In this configuration, a CD optical disk 1 is stored in an ISO standard cartridge 4, and a magnetic material for magnet chucking for coupling to a spindle of an ISO standard optical disk device is provided in a clamping area. A hub 5 is attached.

Therefore, the recording medium 1 itself can be set and driven in an ISO standard optical disk device even though it is a CD optical disk.

The cartridge 4 has an identification means 6 for indicating that the optical disk 1 stored therein is a CD-type optical disk. Therefore, when the cartridge 4 is set in an ISO standard optical disk apparatus, the identification means 6 is used. By detecting,
It is driven as a CD-type optical disk and subjected to signal processing.

The CD-type optical disc 1 is driven to record /
When the cartridge 4 is inserted, the loading hub M3 takes in the cartridge 4 and the magnetic hub 5 is magnetically chucked. Is fixed to the spindle of the spindle motor M1.

The sensor 7 detects the identification means 6 of the cartridge 4, detects the detection signal, and inputs the detection signal to the control circuit 8. Is determined. In response to the input of the detection signal, the control circuit 8 switches the rotation speed of the spindle motor M1 to the rotation speed of the CD optical disk and also switches to the tracking control method for the CD optical disk.

The cartridge 4 is loaded with a loading motor M3
When the detection signal from the sensor 7 is turned off, the rotation speed of the spindle motor and the tracking control method are switched to the original ISO standard optical disk reproduction mode.

FIG. 2 shows an example in which a magnetic hub for magnet chucking is attached to a CD optical disk.
Is a nail fixing structure, and (b) is a screw fixing structure.

In the example of (a), a plurality of claws 11 integrated with the magnetic hub 5 are inserted into the center hole 10 of the CD-type optical disc 1, and a claw receiving ring 12 is attached from the opposite side. The magnetic hub 5 is attached to the clamping area 2 by hooking and fixing the claws 11 by snap action.

In the example of (b), the male screw portion 13 attached to the magnetic hub 5 is inserted into the center hole 10 of the CD-type optical disk 1, and the nut 14 is screwed in from the opposite side. , The magnetic hub 5 is attached. The magnetic material hub 5 may be entirely made of a magnetic material, but may be made up of only a portion indicated by 5 m as shown in the drawing. The magnetic hub 5 may be attached by any other method.

FIG. 3 shows a CD with the clamping hub of FIG.
1 is an embodiment of a cartridge for storing a system optical disk 1; The shape and dimensions of the cartridge are the same as those of the ISO standard cartridge, but the CD optical disc 1
Can be easily put in and out.

In the example shown in (a), the end surface is open, the end surface 15 of the ISO standard cartridge 4a is a lid, and the hinge portion is provided.
It has a structure that can be opened and closed by rotating it around 16. The opening / closing lid 15 has a claw 17 at the tip thereof. After the CD-type optical disc is inserted and the lid 15 is closed, the claw 17 is caught by a projection in the cartridge 4a and fixed.

The example (b) is a double-opening type, in which both side walls 18 and 19 of the ISO standard cartridge 4b can be opened and closed around the hinge portion 20. After inserting a CD-type optical disc,
When 8 and 19 are closed, the claw 21 at the tip is hooked on the projection on the other side and fixed.

FIG. 4 is a diagram exemplifying a detector capable of switching the tracking control method of the optical head in an optical disk drive for driving a CD optical disk built in an ISO standard cartridge. In the optical disc apparatus of the CD system, the three-beam system is mainly used, and the
In a standard optical disk device, a push-pull system is dominant.

That is, the three-beam tracking control in the CD-type optical disc apparatus detects the tracking error signal (TES) by using the output difference (EF) between the auxiliary beam detectors e and f in the detector shown in the figure. It has become.

On the other hand, the push-pull method in the ISO standard optical disk device uses the added value (A + B)-(C + D) of the outputs of the main beam detectors a to d of the detector, that is, the track shift using the left / right balance. Is to be detected.

As shown in FIG. 4, the detector according to the present invention has a detector configuration that can employ both tracking control methods. Tracking control is performed by a pull method. When a sensor detects a CD optical disk, the tracking control method is switched to the former three-beam method.

FIG. 5 is a block diagram showing an embodiment of the optical disk apparatus according to the present invention. The optical head H transmits the laser light from the laser diode 101 to the collimator lens 103.
, And then into three light beams by the diffraction grating 105.

The three light beams are split by a beam splitter.
The light is irradiated onto the optical disc 1 through a 107, a λ wavelength plate 108 and an objective lens 110.

Then, the three light beams reflected from the optical disk 1 are incident on the detectors 122, 124, 126 of the optical detector 120 as the sub-spot S1, the main spot M, and the sub-spot S2 by the beam splitter 107, respectively.

The outputs of the detectors 122 and 126 are connected to the error amplifier 13
Since it is input to 0, the error amplifier 130 outputs an error signal corresponding to the tracking error. Meanwhile, the detector 124
Is composed of four photodiodes 124a to 124d, and the outputs of the photodiodes 124a and 124b are
2 and the outputs of the photodiodes 124c and 124d are amplified by the addition amplifier 134.

The error amplifier 136 has a summing amplifier.
The outputs of 132 and 134 are input and an error signal corresponding to the tracking error is output.

Here, the system controller 140 connects the error amplifier 130 to the subsequent phase compensation circuit 142 according to the output of the identification sensor 7 when the currently set optical disk is a CD system, and In the standard case, a switching signal is output to the switching circuit 144 so that the error amplifier 136 is connected.

The output of the phase compensation circuit 142 is supplied to an adder 146,
It is given to the tracking coil 150 via the drive circuit 148, and moves the objective lens 110 in cooperation with the magnet 152,
Servo control is performed so that the main spot M is in an on-track state.

Note that the output of the detector 124 is
After passing through 0, it is given to the demodulation circuit 162, and performs a demodulation operation according to the type of the optical disk set.

[0045]

As described above, according to the optical disk apparatus of the present invention, although it is a CD-type optical disk, it can be set and played back on an ISO standard optical disk apparatus.
If there is one O-standard optical disk device, various types of CD-type optical disks can be used in addition to ISO standard file optical disks, which is extremely advantageous in terms of economy and installation space. Further, when a CD-type optical disk as the second optical disk is inserted, the optical disk is reset for the CD-type optical disk, so that it can be normally set for the first optical disk as the ISO standard optical disk. Can be used and the usability is improved.

Further, if a recordable medium can be realized as a CD-type optical disk, by setting it in the optical disk apparatus of the present invention, software of a CD-type optical disk can be produced at low cost and in various kinds and in small quantities.

[Brief description of the drawings]

FIG. 1 is a conceptual diagram illustrating a basic principle of an optical disk cartridge and an optical disk device according to the present invention.

FIG. 2 is an exploded cross-sectional view illustrating a CD optical disk according to the present invention.

FIG. 3 is a perspective view showing a cartridge for a CD optical disk in the present invention.

FIG. 4 is a diagram illustrating a detector capable of switching a tracking control method.

FIG. 5 is a block diagram illustrating a circuit configuration of the optical disc device of the present invention.

FIG. 6 is a perspective view showing a normal CD optical disk.

FIG. 7 is a perspective view showing a normal ISO standard optical disc.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 CD-type optical disk 2 Clamping area 3 ISO standard optical disk 4 Normal ISO standard optical disk cartridge 4a, 4b ISO standard optical disk cartridge in the present invention 5 Hub for magnet chucking 6 Identification means 7 Sensor 8 Control circuit M1 Spindle motor M2 Optical head drive motor M3 Loading motor H Optical head

──────────────────────────────────────────────────続 き Continued on the front page (58) Fields surveyed (Int. Cl. ⁶ , DB name) G11B 19/12 501 G11B 7/00 G11B 23/03 G11B 23/30

Claims (4)

(57) [Claims] A first optical disk provided by a cartridge identification means;
A sensor for identifying a disk and a second optical disk, and a type of the optical disk based on an identification signal from the sensor.
When the type is recognized and the optical disk is determined to be the second optical disk,
In this case, control of the light beam corresponding to the second optical disk, control of the rotation speed of the optical disk, or control for switching to tracking control or demodulation control is performed.
When the second optical disc is ejected,
Control of a light beam corresponding to one optical disc, or
Disk speed control or tracking control, or
An optical disc device comprising at least control means for performing control for switching to demodulation control . 2. The optical disc according to claim 1, wherein the first optical disc conforms to ISO standards.
2. An optical disk according to claim 1,
Optical disk device. 3. The first optical disk is of a magneto-optical type, or
Or a phase change type.
Item 3. The optical disk device according to item 2. 4. The optical disc of claim 2, wherein the second optical disc is a CD-based optical disc.
4. The disk according to claim 1, wherein the disk is a disk.
An optical disk device according to any one of the above.