JPH09231672A - Optical disk device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify the device by making an ISO-standard optical disk device capable of setting and reproducing a CD type optical disk as well. SOLUTION: The CD type optical disk 1 is housed in an ISO-standard cartridge 4. This cartridge 4 is equipped with an identification means for showing that the CD type optical disk 1 is housed, and a magnetic hub 5 for magnetic chucking is fitted to a clamping area of the CD type optical disk 1. Thus, the CD type optical disk 1 housed in the ISO-standard cartridge 4 can be recorded/ reproduced by the optical disk device obtained by more or less modifying the ISO-standard device. That is, the ISO-standard optical disk device is provided with a sensor 7 for detecting the identification means 6 of the cartridge, possessing a control circuit 8 to input a detecting signal of this sensor 7.

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) type optical disk can be shared with an ISO standard optical disk device.

[0002]

2. Description of the Related Art Currently, 5 inch size optical discs are classified into a CD type optical disc and an ISO standard optical disc when they are classified by a physical shape and a recording / reproducing system.

CD-type optical discs include music CDs, data CD-ROMs containing code information, music and image CD-Vs, character information as well as still images, graphics, and voices. The CD-I etc. which it handles are put to practical use.

The structure of the optical disk is as shown in FIG.
A mechanical clamp system is used, which consists of a single optical disk, and is set in an optical disk device in which the clamping area 2 of the optical disk 1 is mechanically clamped to be connected to a spindle motor.

Between these CD type optical disks,
The shapes and recording formats are standardized, and they are compatible with each other, and one optical disk device can set and play various CD optical disks.

[0006] On the other hand, ISO standard compliant optical discs can be classified into a punching type, a phase change type, a magneto-optical type and the like according to a recording / reproducing system, and can be written by an optical disc device.

The structure of the optical disk is 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 magnetic chucking system is adopted.

[0008]

By the way, the above-mentioned various
Since there is compatibility between CD-based optical disks, one CD-based optical disk device can be shared and played back, and between ISO standard optical disks, regardless of the recording / playback method, one It is possible to record / reproduce by sharing the optical disc device.

However, since there is no compatibility between the CD type optical disk and the ISO standard optical disk, it is the current situation that the optical disk device cannot be shared. Therefore, the CD
When it is desired to use both the optical discs of the system and the ISO standard, the optical disc devices of the CD system and the ISO standard are required.

Since the information pattern can be transferred by the stamper on the CD type optical disk, 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, since the ISO standard optical disk can be additionally written, it is possible to produce a large variety of software in small quantities.

Therefore, if the CD type optical disc is composed of a recordable medium and recording / reproducing is possible with the ISO standard optical disc device, the software of the CD type optical disc can be produced at low cost in a large variety of products.

A technical object of the present invention is to realize an optical disk apparatus capable of recording / reproducing a CD optical disk by sharing an ISO standard optical disk apparatus with attention paid to such a problem.

[0014]

The technical problem of the present invention is solved by the following means. According to a first aspect of the present invention, a sensor for identifying the shape of the optical disk from the identification means of the cartridge, the type of the recording / reproducing system of the optical disk is identified by the identification signal from the sensor, and the control of the light beam is performed according to the type. Or control the number of rotations of the optical disc
Alternatively, the optical disk device includes at least a control unit for switching between tracking control and demodulation control.

When an optical disk cartridge as shown in FIGS. 2 and 3 is loaded and driven in the optical disk device having such a structure, the sensor discriminates the shape of the optical disk to recognize the type of the recording / reproducing system, and the CD system. In the case of the optical disc of No. 1, the optical beam control, the optical disc rotation speed control, the tracking control, the demodulation control, etc. are switched to the CD system in accordance with the above type, and the CD system is used even though it is an ISO standard optical disc device. It becomes possible to record / reproduce by sharing the same with the optical discs.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION Next, an embodiment of how the optical disk device according to the present invention is actually embodied will be described. FIG. 1 is a principle diagram showing a state in which a CD type optical disc is loaded and recorded / reproduced by the optical disc apparatus according to the present invention.

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

In this way, the ISO standard cartridge 4
The CD type optical disc 1 housed in the disc can be recorded / reproduced by an optical disc device which is a slight modification of the ISO standard device. That is, an ISO standard optical disk device is provided with a sensor 7 for detecting the cartridge identification means 6, and a control circuit 8 for receiving a detection signal of the sensor 7.

Further, this optical disk device has a spindle motor rotation speed switching means and a tracking control method switching means between the CD type optical disk and the ISO standard optical disk, and this mode switching is performed by the control circuit 8. Done by

Incidentally, 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 loading and unloading a cartridge, and 9 is a signal processing circuit.

In this structure, the CD optical disk 1 is housed in the ISO standard cartridge 4, and the clamping area is a magnetic body for magnet chucking for connecting to the spindle of the ISO standard optical disk apparatus. A hub 5 is attached.

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

The cartridge 4 has an identifying means 6 for indicating that the optical disk 1 accommodated therein is a CD type optical disk. Therefore, when the cartridge 4 is set in an ISO standard optical disk device, the identifying means 6 is used. By detecting
It is driven as a CD-type optical disc and signal processed.

Recording / recording by driving the optical disk 1 of this CD system
In the ISO standard optical disk device for reproduction, when the cartridge 4 is inserted, the magnetic motor hub 5 is magnetized and chucked by the loading motor M3, and then the magnetic hub 5 is magnetically chucked. Is fixed to the spindle of the spindle motor M1.

Further, 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, so that the cartridge 4 contained therein is a CD type optical disk. Is determined. In the control circuit 8, the rotation speed of the spindle motor M1 is switched to the rotation speed of the CD optical disk and the tracking control method for the CD optical disk is switched by the input of the detection signal.

The cartridge 4 has a loading motor M3.
When the detection signal from the sensor 7 is turned off, the spindle motor rotation speed and 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 type 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 central hole 10 of the CD optical disk 1, and the 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 claw 11 with a snap action.

In the example of (b), the male screw portion 13 attached to the magnetic hub 5 is inserted into the central hole 10 of the CD type optical disc 1 and the nut 14 is screwed in from the opposite side to form the clamping area 2 The magnetic hub 5 is attached by sandwiching. The magnetic hub 5 may be entirely made of a magnetic material, but as shown in the figure, only a part indicated by 5 m may be made of a magnetic material. The magnetic hub 5 may be attached by a method other than these.

FIG. 3 shows a CD with the clamping hub of FIG.
1 is an example of a cartridge that stores a system optical disc 1. The shape and dimensions of the cartridge are the same as those of the ISO standard cartridge, but the CD type optical disc 1
Can be easily put in and taken out.

The example of (a) is an end face open type, the end face 15 of the ISO standard cartridge 4a is a lid, and the hinge part is
It has a structure that can be opened and closed by rotating around 16. The openable lid 15 has a claw 17 at the tip thereof, and when the CD 15 optical disc is inserted and then the lid 15 is closed, the claw 17 is caught by the protrusion in the cartridge 4a and fixed.

The example of (b) is a double-open type, and both side walls 18 and 19 of the ISO standard cartridge 4b can be opened and closed centering on the hinge portion 20. After inserting a CD type optical disc, both side walls 1
When 8 and 19 are closed, the claw 21 at the tip is caught by the protrusion on the other side and fixed.

FIG. 4 is a diagram exemplifying a detector capable of switching the tracking control system of the optical head in an optical disk device for driving a CD optical disk built in an ISO standard cartridge. The three-beam system is the mainstream for CD-based optical disk devices.
The push-pull method is predominant in standard optical disk devices.

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

On the other hand, the push-pull method in the ISO standard optical disk apparatus utilizes the added value (A + B)-(C + D) of the outputs of the main beam detectors a to d of the detector, that is, the left and right balance to shift the track. It is designed to detect

Since the apparatus of the present invention has a detector structure capable of adopting both tracking control systems as shown in FIG. 4, normally, the main beam detectors a to d are used to push the latter. Although tracking control is performed by the pull system, when the CD type optical disk is detected by the sensor, the tracking control system is switched to the former three-beam system.

FIG. 5 is a block diagram showing an embodiment of the optical disk device according to the present invention. The optical head H uses the collimator lens 103 for the laser light from the laser diode 101.
After being converted into parallel light through, the diffraction grating 105 forms three light beams.

These three light beams are beam splitters.
The optical disc 1 is irradiated with light through the 107, 1/4 λ wavelength plate 108, and the objective lens 110.

Then, the three light beams reflected from the optical disc 1 are incident on the detectors 122, 124 and 126 of the photodetector 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 the error amplifier 13
Since it is input to 0, the error amplifier 130 outputs an error signal according 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 the summing amplifier 13
2 is amplified, and the outputs of the photodiodes 124c and 124d are amplified by the summing amplifier 134.

The error amplifier 136 includes a summing amplifier.
The outputs of 132 and 134 are input and the error signal according 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, while the ISO In the standard case, the switching signal is output to the switching circuit 144 so as to connect the error amplifier 136.

The output of the phase compensation circuit 142 is the 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 the on-track state.

The output of the detector 124 is the summing amplifier 16
After 0, the demodulation operation is given to the demodulation circuit 162, and the demodulation operation is performed according to the type of the set optical disk.

[0045]

As described above, according to the optical disc apparatus of the present invention, even though it is a CD type optical disc, it can be set in the ISO standard optical disc apparatus and reproduced. Therefore, if there is one ISO standard optical disc apparatus. In addition to ISO standard file optical discs, various CD optical discs can be used.
It is extremely advantageous both economically and in terms of installation space.

If a recordable medium can be realized as a CD type optical disc, by setting it in the optical disc device of the present invention, the software of the CD type optical disc can be produced inexpensively and in a variety of small quantities.

[Brief description of drawings]

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

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

FIG. 3 is a perspective view showing a cartridge for a CD optical disk according to 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 an ordinary CD-based optical disc.

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

[Explanation of symbols]

1 CD type optical disk 2 Clamping area 3 ISO standard optical disk 4 Ordinary ISO standard optical disk cartridge 4a, 4b ISO standard optical disk cartridge 5 of 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

Claims (1)

[Claims] 1. A sensor for identifying a shape of an optical disc from a cartridge identifying means, and a type of recording / reproducing system of the optical disc is identified by an identification signal from the sensor, and a light beam control is performed according to the type. Or a control unit for switching the rotation speed control of the optical disc, the tracking control, or the demodulation control.