JPH11213588A - Optical disk device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical disk device capable of performing recording or reproduction to both of an optical disk provided with a cartridge whose read-in area is present at a disk outer peripheral part and the disk whose read-in area is present at the inner peripheral part of the disk and realizing high-speed start. SOLUTION: In this optical disk device provided with an optical head 6 for irradiating the optical disk 1 with a laser beam and receiving reflected light from the optical disk 1, a discrimination means for discriminating the presence/absence of the cartridge of the disk 1 loaded to the device is provided, and at the time of starting the device and at the time of changing the disk 1, the position of the optical head 6 is moved to a prescribed position based on the discriminated result of the discrimination means. Thus, since the kind of the loaded optical disk is accurately discriminated by discriminating the presence/absence of the cartridge and the position of the optical head is correctly moved to the read-in area of the respective disks, the optical head does not collide with the inner peripheral side or outer peripheral side of the device and the read-in area is safely read.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disk apparatus capable of recording / reproducing information on a plurality of types of optical disks.

[0002]

2. Description of the Related Art In recent years, an optical disk has been attracting attention as a medium capable of recording / reproducing high-density and large-capacity information. Various recording formats for data on an optical disk have been proposed.

FIG. 4 is a diagram for explaining an example of a recording format of an optical disk (Japanese Patent Laid-Open No. 2-216621). In this figure, reference numeral 101 denotes an optical disk, on which tracks 102 are spirally formed. In FIG. 4, the track 102 is represented as a continuous groove, but may be a pit row.
103 is a data area for recording information (data),
104 is a lead-in area. This lead-in area 1
Reference numeral 04 is provided on the inner peripheral side of the data area 103, and records the recording position (address information) of the data in the data area 103. Data is recorded in a direction from the inner circumference to the outer circumference of the disk.

In an optical disk apparatus for recording and / or reproducing a disk having the above-described recording format (hereinafter referred to as recording / reproduction), recording / reproduction is performed in the following procedure when a disk is loaded or when the apparatus is started up. Do.

As shown in FIG. 4, in order to read address information and the like recorded in a lead-in area existing in the inner peripheral portion of the disk, first, an optical head for writing and reading information is moved to the inner peripheral portion of the disk. Move to Then, information such as address information recorded in the lead-in area 104 is read using an optical head. Subsequently, the optical head is moved to a desired position in the data area 3 in order to perform recording or reproduction.

FIG. 5 is a diagram showing another example of the recording format of the optical disk (Japanese Patent Laid-Open No. 3-269841). Here, the lead-in area 104 is the data area 10
3 is arranged outside. The track is formed in a spiral shape, and data is recorded in a direction from the outer circumference to the inner circumference of the disk.

In an optical disk apparatus for recording / reproducing a disk having such a recording format, recording / reproduction is performed in the following procedure when a disk is loaded or when the apparatus is started up.

As shown in FIG. 4, in order to read address information and the like recorded in a lead-in area 104 existing on the outer peripheral portion of the disk, first, an optical head for writing and reading information is provided on the outer peripheral portion of the disk. Move.
Then, information such as address information recorded in the lead-in area 104 is read using an optical head. Subsequently, in order to perform recording or reproduction, the data area 103
The optical head is moved to a desired position.

[0009]

As recording media for recording information at high density, CDs (compact discs) and DVDs are used.
Optical disks such as (digital video disks) are widely used, and the recording format of these optical disks (especially a read-only optical disk; hereinafter, referred to as a first disk) is mainly a recording format as shown in FIG. Format is used. Therefore, as an optical disk device for reproducing the above-described optical disk, there are many devices that perform reproduction on the premise that the optical disk device has a lead-in area in an inner peripheral portion.

However, in recent years, an optical disk capable of recording data at a high density and having a high data transfer rate has been desired. Such an optical disk is different from the optical disk shown in FIG. An optical disk that is protected and has a lead-in area on the outer peripheral portion (hereinafter, referred to as a second disk) is being studied.

[0011] The reason is that, in an optical disk capable of recording data at high density, if dust, dust, or the like adheres to the optical disk, erroneous data may be continuously recorded. Therefore, in order to improve the reliability of recorded data, an optical disk capable of high-density recording is preferably an optical disk whose data is protected by a cartridge 200 as shown in FIG. In order to meet the demand for a high transfer rate, the recording format of FIG. 5 is more advantageous than the recording format of FIG. This is because in the recording format of FIG. 5, since the lead-in area 104 is located at the outer peripheral portion, the linear velocity in the lead-in area when the disk is rotated at the same angular frequency is larger than that in FIG. This is because the data transfer speed increases.

By the way, as an optical disk device for recording / reproducing such a second disk, a device which can reproduce even a read-only disk (first disk) which is widely used at present is desired. In this case, the optical disk device needs to be a device capable of recording / reproducing both of the recording formats shown in FIGS.

However, when recording and reproducing both the first disk and the second disk as described above, if the optical head is moved to a wrong place when the disk is loaded, it takes a long time to start up, and furthermore, the optical head is not used. There is a risk of collision with the outer peripheral side or inner peripheral side of the device.

For example, in the case of a device that targets the first disk (FIG. 4) having a lead-in area on the inner peripheral portion, such as a conventional read-only optical disk device, an optical head is set when the optical disk is loaded into the device. Is driven inward to reproduce the lead-in. When this device is used to record / reproduce the second disk (FIG. 5) having the lead-in area on the outer periphery, the light is transmitted as in the conventional device. Even if the reproducing operation is performed by driving the head to the inner peripheral side, the information recorded in the lead-in area cannot be reproduced because the lead-in area is not on the inner peripheral side,
Quick startup is not possible. Moreover, since the track is directed from the outer circumference to the inner circumference, the optical head moves toward the inner circumference, and if the reproduction is continued as it is, in the worst case, the optical head collides with the inner circumference. There is a fear.

Conversely, in the optical disk drive for driving the optical head to the outer peripheral side when the optical disk is loaded, when the first disk (FIG. 4) is loaded, the optical head reproduces from the outer peripheral portion of the first disk. As in the previous case, the lead-in area cannot be found, and rapid startup cannot be performed. In addition, since the tracks of the optical disk are directed from the inner circumference to the outer circumference, the optical head moves to the outer circumference side, and if the reproduction is continued as it is, in the worst case, the optical head may collide with the outer circumference side.

The present invention has been made in view of the above problems, and it is possible to reproduce both an optical disk having a lead-in area on the outer periphery of the disk and an optical disk having a lead-in area on the inner periphery of the disk. It is an object of the present invention to provide a device that can perform quick startup.

[0017]

According to a first aspect of the present invention, there is provided an optical disk apparatus comprising: a first optical disk having a lead-in area formed on an outer peripheral portion and having a cartridge; An optical disc device for recording or reproducing information with respect to a second optical disc formed and having no cartridge by using an optical head, and detects whether or not the loaded optical disc has a cartridge. A cartridge detecting means for detecting the presence of the cartridge, moving the optical head to the outer peripheral portion of the optical disk when exchanging the optical disk or starting up the apparatus, and detecting the absence of the cartridge when loading the optical disk; Or a head for moving the optical head to the inner peripheral portion of the optical disk when starting up the apparatus. It is made of comprises a moving means.

According to a second aspect of the present invention, in the optical disk apparatus of the first aspect, when information cannot be obtained even after a predetermined waiting time has elapsed after the start of reproduction of the lead-in area, the read operation is repeated. First retry means for starting reproduction of the in-area, and first waiting time setting for setting the predetermined waiting time shorter when detecting that the cartridge is present than when not detecting that the cartridge is present. Means.

According to a third aspect of the present invention, in the optical disk apparatus according to the first aspect, after the reproduction of the lead-in area is started, when information cannot be obtained even if the optical disk rotates by a predetermined number of rotations, A second retry unit for restarting the reproduction of the lead-in area; and setting the predetermined number of revolutions lower when the detecting unit detects that the cartridge is present than when the unit detects no cartridge. And second waiting time setting means.

According to a fourth aspect of the present invention, in the optical disk device according to any one of the first to third aspects, when the optical disk is replaced or the device is started up,
The optical head jumps from the inner circumference to the outer circumference of the optical disc when it is detected that the cartridge has the cartridge by the cartridge detection unit, and moves from the outer circumference to the inner circumference of the optical disc when it is detected that the cartridge does not have the cartridge. And a track jump means for jumping the optical head.

An optical disk device according to claim 5, wherein information is recorded or reproduced on at least a first optical disk having a cartridge and a second optical disk having no cartridge by using an optical head. A cartridge detecting means for detecting whether or not the loaded optical disc has a cartridge; and when exchanging the optical disc or starting up the apparatus, the cartridge detecting means detects that the optical disc has the cartridge. Magnetic head approaching means for approaching a magnetic head for recording information to an optical disk.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS (Embodiment 1) Hereinafter, an embodiment of an optical disk apparatus according to the present invention will be described in detail with reference to the drawings.

The optical disk device of the present embodiment includes a CD,
An optical disk having a lead-in area typified by a DVD or the like on the inner peripheral side and having no cartridge (first disk, FIG.
The recording / reproducing is performed on both the optical disk (see FIG. 5) and the optical disk (the second disk, see FIG. 5) in which the lead-in area is on the outer peripheral side in the cartridge shown in FIG.

The first disk is, for example, a read-only disk, and the second disk is, for example, a disk capable of high-density recording. Further, a spiral opposite to that of the first disk is formed in the track of the second disk, so that the directions of rotation of the disks when recording and reproducing the first disk and the second disk are the same. Shall be.

FIG. 1 is a schematic block diagram for explaining the configuration of the optical disk device of the present embodiment. In FIG.
Reference numeral 1 denotes an optical disk, which is loaded on a spindle motor 5. Reference numeral 6 denotes an optical head, and a laser beam 7
To record and reproduce information. The optical head 6 has a fine movement actuator (not shown) for finely moving the laser beam 7 in the disk radial direction. Reference numeral 8 denotes a coarse movement actuator, which drives the optical head 6 in the disk radial direction. Reference numeral 9 denotes a tracking error generating unit which generates a tracking error signal from the output of the optical head 6.
Reference numeral 10 denotes a servo unit that drives the fine actuator and the coarse actuator 8 in the optical head 6 based on the tracking error signal to cause the laser beam 7 to follow a track on the optical disk 1.

Reference numeral 11 denotes switch means (cartridge detection means) for determining the presence or absence of a cartridge on the optical disk 1, and outputs the determination result to the controller 12.
When the cartridge is loaded, the switch means 11 is turned on by mechanically contacting the cartridge, thereby determining the presence or absence of the cartridge.

Reference numeral 13 denotes a magnetic head, which is used when recording information. The magnetic head 13 is connected to a head elevating means 15 via a support spring 14. At the time of loading an optical disk, the magnetic head 13 is arranged at a position sufficiently distant from the optical head to prevent contact with the optical disk. If the switchable means 11 determines that the second disk is loaded, the controller 12 drives the head lifting / lowering means 15 to lower the magnetic head 13 to approach the optical disk 1. On the other hand, when it is determined that the first disk is loaded, the magnetic head 13 is not moved.

The present optical disk device is configured as described above. In FIG. 1, the servo means 10 and the controller 12 constitute a head driving means in the claims, and the head elevating means 15 and the controller 12 constitute a magnetic head approaching means.

In the optical disk device having such a configuration, when the optical disk is loaded in the device or when the power is turned on, the optical disk is rotated and the presence / absence of the cartridge is detected by the switch means 11.
The recording format of the loaded optical disc is determined.

If it is determined that there is no cartridge, that is, it is determined that the disk is the first disk, the controller 12 drives the optical head 6 to the inner peripheral side of the disk through the servo means 10. On the other hand, if a cartridge is detected, the second
The optical head 6 is determined to be a disk and the optical head 6 is driven to the outer peripheral side of the disk.

As described above, the type of the loaded disc is determined, and the position of the optical head 6 is correctly moved to the position of each lead-in area. The lead-in can be reproduced safely and quickly without collision. Further, by performing the above operation simultaneously with the rotation of the optical disk, the optical head 6 can be moved until the optical disk reaches the predetermined number of rotations, and the apparatus can be started up quickly.

As described above, the controller 12
Is a recordable disc, that is, the switch means 11
When it is determined that a disk having a cartridge is loaded in step 2, the head lifting / lowering means 15 is driven to move the magnetic head 13 near the disk. Since a cartridge is often provided to improve the reliability of data on a recordable optical disc, it is determined whether or not the disc is a recordable disc based on the presence or absence of the cartridge. If the recording can be started immediately, the apparatus can be started up at high speed.
In the case of a disk without a cartridge, the magnetic head is not lowered, so that damage to the magnetic head due to a label on the disk can be prevented. The process of bringing the magnetic head closer in this way is effective no matter where the lead-in area is.

(Embodiment 2) Next, an optical disk device according to Embodiment 2 of the present invention will be described. The present embodiment has the same configuration as that of the first embodiment shown in FIG. Therefore, the description of the same parts as in the first embodiment will be omitted. The servo means 10, the controller 12 and the reproducing mechanism (not shown) in FIG. 1 constitute a retry means in the claims, and the controller 12 constitutes a waiting time setting means.

In this embodiment, the controller 12
In accordance with the determination result of the switch means 11, a waiting time until the retry of the lead-in area reproduction is set.

Here, the read-in area reproduction retry means that when information is not obtained even when the optical head 6 is moved to the lead-in area and reproduction is performed, a certain period of time (waiting time)
After the lapse of time, or after the optical disk has been rotated at a certain fixed number of revolutions, the optical head 6 is returned to the original position, and the read-in area is reproduced again.

By the way, there are roughly the following two types of optical disk recording systems. A recording method in which the recording frequency is higher on the outer peripheral side of the disk, for example, the number of rotations is constant on all disks, a plurality of recording areas are divided in the radial direction of the disk, and the recording frequency is higher on the outer peripheral side of the disk Recording method (Z
Disc recorded by CAV method or the like. in this case,
If the amount of information in the lead-in area is the same, the time for reproducing the lead-in area is shorter for the second disk having the lead-in area on the outer peripheral portion of the disk.

On all disks, the linear velocity is constant (CL
V method) or a method in which the disk is divided into a plurality of regions in the radial direction of the disk, and the disk rotation speed is constant within the region, and the rotation speed becomes higher toward the inner circumference side of the disk (ZCLV system). Disc recorded with). In this case, the second disk is
Since the recording capacity for one turn of the track in the lead-in area is large, the number of necessary tracks is reduced when the information amount is the same.

As described above, when comparing the number of tracks in the lead-in area between the second disk and the first disk in the above two types of disks, the number of tracks in the second disk is smaller in both cases.

These disks are rotated at a constant rotation speed (CAV).
In the case of the second disk, since the number of tracks is smaller in the case of the second disk than in the case of the first disk, the time for reading the lead-in area can be shortened. When reading at a constant linear velocity (CLV), the number of tracks to be read in the case of the second disk is smaller than that in the case of the first disk.

The present embodiment has been made based on the above considerations. (1) When it is determined that the loaded disk is the second disk, the controller 12 waits for a retry. Is set shorter than in the case of the first disk. (2) When it is determined that the loaded disk is the second disk, the controller 12 sets the number of revolutions until retry to be smaller than that of the first disk. , The waiting time until retry when the lead-in information cannot be read is reduced. And
As a result, the start-up time of the device can be reduced.

(Embodiment 3) Next, an optical disk device according to Embodiment 2 of the present invention will be described. The present embodiment has the same configuration as that of the first embodiment shown in FIG. Therefore, the description of the same parts as in the first embodiment will be omitted. The servo means 10 and the controller 12 in FIG. 1 constitute a track jump means.

In this embodiment, the controller 12 switches the jump polarity in accordance with the result of the determination by the switch means 11. This is because the direction in which data is recorded is opposite between the first disk and the second disk. In the case of the first disk, the address increases from the inner circumference to the outer circumference, whereas the address increases from the inner circumference to the outer circumference. In a disk, addresses increase from the outer circumference to the inner circumference. Therefore, the controller 12 needs to switch the polarity of the jump in the direction in which the address increases. In addition, when a spiral track is being reproduced, the jump is made in the original direction after one round in order to stay on the same track. The direction of this jump needs to be switched between a disc on which data is recorded from the outer periphery and a disc on which data is recorded from the inner periphery. Therefore, the controller 12 issues an instruction to the servo unit 10 according to the output of the switch unit 11 to switch the jump direction. As a result, an accurate jump operation can be obtained regardless of the type of disc, and stable disc reproduction can be performed.

Next, a description will be given of the flow of processing when executing the operation of the optical disk device described in the first to third embodiments.

FIG. 2 is a flowchart for summarizing the operations of the optical disk devices of the first to third embodiments described above, and sequentially explaining the operations.

When the optical disk 1 is loaded in the apparatus or when the power is turned on (S1), the disk is rotated (S2), and the presence or absence of the cartridge of the optical disk 1 is determined by the switch means 11 (S3). .

If there is a cartridge, the optical head 6 is moved to the outer peripheral portion of the optical disk 1 because it is the second disk which is a recordable disk (S4).

Next, the magnetic head 13 for recording is lowered (S5), and the polarity of the jump is switched from the inner circumference to the outer circumference (S6).

Next, a waiting time until the retry of reading the lead-in area is set. The waiting time is set to a value smaller than that of the first disk (S7).

On the other hand, if there is no cartridge in (S3), the optical disk 6 is moved to the inner peripheral portion of the optical disk 1 because it is the first disk (S8). Then, the polarity of the jump is switched (S9). Then, a waiting time until the retry of reading the lead-in area is set (S10).

After moving the optical head 6 to a predetermined position on each disk, the optical head 6 is irradiated with a laser beam and the servo is turned on.
Then, information of the lead-in area is read (S12).

As described above, according to the first to third embodiments of the present invention, the type of the disc is determined and the position of the optical head is correctly moved to the lead-in area of each disc. The lead-in area can be safely reproduced without colliding with the inner peripheral side or the outer peripheral side. Further, since the optical head can be moved until the optical disk reaches a predetermined number of rotations, the start-up time of the apparatus can be reduced.

In the case of a recording disk, since the magnetic head is lowered, the apparatus can be started up quickly. In the case of the read-only first disk, since the magnetic head does not descend, damage to the magnetic head due to the label of the disk can be prevented.

When the information in the lead-in area cannot be read due to some error, the time until the retry is optimally set for each disk. Therefore, even if there is an error, the retry is performed without wasteful waiting time. It can be performed.

Further, since the jump polarity is switched according to the recording format of the disc, an accurate operation can be obtained.

As means for determining the presence or absence of a cartridge, any other means than the above-mentioned switch means 11 can be used. For example, a means for making a determination by optically detecting a cartridge or a means for making a determination by an external input may be used.

(Embodiment 4) FIG. 3 is a flowchart for explaining the operation of an optical disk apparatus according to another embodiment of the present invention. The configuration of the optical disc device of the present embodiment is the same as that of the first embodiment.

An optical disk 1 is newly loaded in the apparatus.
Alternatively, when the apparatus is powered on (S31), the optical disk 1 is rotated (S32), the optical head 6 is moved to the inner circumference side of the disk (S33), and the laser beam 7 is focused on the disk surface. The focus servo is pulled in (S34).

This is because the outer peripheral portion of the disk has a higher speed of surface runout due to the warpage of the disk than the inner peripheral portion, so that the probability of failing in pulling in the focus servo increases. For this reason, the focus servo is pulled in the inner peripheral portion of the disk having a low surface wobble speed. As a result, reliable servo pull-in becomes possible.

Next, the disc is determined based on the presence or absence of the cartridge (S35).

If a cartridge is present, the optical head 6 is moved to the outer peripheral portion of the optical disk 1 because it is the second disk which is a recordable disk (S36).

Subsequently, the magnetic head 13 for recording is lowered (S37), and the polarity of the still jump is switched from the inner circumference to the outer circumference (S38).

Next, a waiting time until the retry of reading the lead-in area is set. The waiting time is set to a value smaller than that of the case of the first disk (S39).

On the other hand, if there is no cartridge, it is determined that the cartridge is the first disk, and the optical head 6 is moved to the inner peripheral portion of the optical disk 1 (S40).

Subsequently, the polarity of the still jump is switched from the outer circumference to the inner circumference (S41). Then, a waiting time until the retry of reading the lead-in area is set (S42).

As described above, after moving the optical head 6 to the lead-in area of each disk, the radial servo is turned on (S43), and information in the lead-in area is read (S44).

According to the present embodiment, since the focus servo is pulled in the inner peripheral portion of the disk having a low surface wobble speed, reliable servo pull-in is possible.

Further, since the type of the disc is determined and the position of the optical head is correctly moved to the lead-in area of each disc, the optical head can safely be read-in without colliding with the inner or outer peripheral side of the apparatus. An area can be read. Further, since the optical head can be moved until the optical disk reaches a predetermined number of revolutions, the apparatus can be started up quickly.

If it is determined that the disc is a recording disc,
By lowering the magnetic head, the device can be started up quickly. In the case of the read-only first disk, since the magnetic head does not descend, damage to the magnetic head due to a label on the disk can be prevented.

When the information in the lead-in area cannot be reproduced due to some error, the time until retry is set to an optimum value for each disk. Without retrying.

[0070]

According to the present invention, the type of the loaded optical disk can be accurately determined by determining the presence or absence of the cartridge, and the position of the optical head can be correctly moved to the lead-in area of each disk. Therefore, it is possible to safely read the lead-in area without the optical head colliding with the inner peripheral side or the outer peripheral side of the apparatus.

If the time until the retry is optimally set for each disk, the time until the retry can be shortened when the information in the lead-in area cannot be read due to some error, and there is no unnecessary waiting time. A retry operation can be performed.

Further, if the jump direction is determined based on the presence or absence of the cartridge, an accurate jump operation can be obtained, and stable reproduction of the disc can be performed.

Further, since the presence or absence of the cartridge is determined and the magnetic head is lowered when the cartridge is present, it becomes possible to immediately write, and the apparatus can be started up quickly. In addition, when there is no cartridge, the magnetic head does not descend, so that damage to the magnetic head due to the label of the disk or the like can be prevented.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram showing an example of an optical disk device of the present invention.

FIG. 2 is a flowchart illustrating an operation of the optical disc device according to the first embodiment.

FIG. 3 is a flowchart illustrating an operation of the optical disc device according to the second embodiment.

FIG. 4 is an explanatory diagram showing an optical disc having a lead-in area in an inner peripheral portion.

FIG. 5 is an explanatory diagram showing an optical disc having a lead-in area in an outer peripheral portion.

FIG. 6 is an explanatory diagram showing an optical disk having a cartridge.

[Explanation of symbols]

 Reference Signs List 1 optical disk 2 track on optical disk 3 data area 4 lead-in area 6 optical head 11 switch means 12 controller 13 magnetic head 15 magnetic head elevating means

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Tsuneo Fujiwara Sharp Corporation 22-22 Nagaikecho, Abeno-ku, Osaka-shi, Osaka

Claims (5)

[Claims] At least a first optical disc having a lead-in area formed in an outer peripheral portion and having a cartridge, and a second optical disc having a lead-in area formed in an inner peripheral portion and having no cartridge. An optical disk device for recording or reproducing information using an optical head, wherein cartridge detecting means for detecting whether or not the loaded optical disk has a cartridge; and when detecting that the optical disk has a cartridge, The optical head is moved to the outer peripheral portion of the optical disk when replacing the optical disk or when the apparatus is started up, and when it is detected that no cartridge is provided, the optical head is moved to the inner peripheral portion of the optical disk when the optical disk is loaded or the apparatus is started up. And a head driving means for moving the optical disc Apparatus. 2. The optical disk device according to claim 1, wherein after starting reproduction of the lead-in area, when information cannot be obtained even after a predetermined waiting time has elapsed, reproduction of the lead-in area is started again. And a waiting time setting means for setting the predetermined waiting time shorter when detecting the presence of the cartridge than when not detecting the presence of the cartridge. Optical disk device. 3. The optical disk apparatus according to claim 1, wherein after starting reproduction of the lead-in area, reproduction of the lead-in area is started again when no information is obtained even if the optical disk is rotated by a predetermined number of rotations. Retry means, and a waiting time setting means for setting the predetermined number of revolutions lower when detecting that the detecting means has a cartridge than when detecting not having a cartridge. An optical disc device characterized by comprising: 4. The optical disk device according to claim 1, wherein when the optical disk device is replaced or when the device is started up, the detecting means detects that a cartridge is present. And a track jump means for jumping the optical head from the outer circumference to the inner circumference of the optical disk when it is detected that the optical head does not have the cartridge. Optical disk device. 5. At least a first cartridge having a cartridge
An optical disk apparatus for recording or reproducing information on an optical disk and a second optical disk without a cartridge using an optical head, wherein the cartridge detects whether or not the loaded optical disk has a cartridge Detecting means, and magnetic head approaching means for approaching the magnetic head to the optical disk when the detecting means detects the presence of the cartridge at the time of replacing the optical disk or starting up the apparatus. Optical disk device.