JP2002245622A - Information processor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely determine that a disk is irregular shaped even though its mass is almost the same as that of a normal circular plate-like disk. SOLUTION: By a system controller 10, an optical pickup 3 is moved for every specified distance toward the outer peripheral side from the innermost peripheral position of the disk in such a manner that a feed motor 4 is driven by outputting a control signal to a servo processing circuit 9 at the time of mounting the optical disk 1. Then, for every time of the movement for every specified distance, the reflected light at the time when the irradiation light from the optical pickup 3 is reflected on the optical disk 1, is detected by a digital signal processing circuit 7 through an RF amplifier 5. Bt the system controller 10, the detected signal from the digital signal processing circuit 7 is always monitored, and when the reflected light is intermittently detected, it is determined that the mounted optical disk 1 has the irregular shape, not the disc-like shape.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an information processing apparatus for recording data on an optical disk by an optical pickup or reproducing the recorded data, and more particularly, to an information processing apparatus capable of determining the shape of a loaded optical disk. Related to the device.

[0002]

2. Description of the Related Art Recently, music CDs and CD-ROMs (CD-ROMs) have been developed.
Optical discs such as R, CD-RW, and DVD-ROM are widely used as information recording media for individuals. Such optical discs are typically 2 cm in diameter and 8 cm in diameter.
Various types of discs are used, but recently,
There are also provided on the market a card type which is easy to carry, and a variety of shapes (for example, a petal type) aiming at a design effect.

When an information reproducing apparatus (disk drive) reproduces such a disc having a different shape from a conventional disc, such as a card type or a petal type, the reproducing speed is high (for example, 8 times the standard speed, At 16 × speed, 32 × speed, etc.), the disk has an irregular shape, causing vibrations and the like, which causes a problem that recorded data cannot be correctly reproduced. Therefore, in the case of a deformed disk, it is necessary to rotate the disk at a safe speed that does not cause vibration or the like and that can correctly reproduce data. This is the same when data is recorded on a deformed disc.

Therefore, conventionally, the shape of the loaded disk is determined in advance, and the rotation speed of the disk in the recording mode or the reproduction mode is set to a low speed (for example, Japanese Patent Laid-Open No. -345455).

In this disk device, as a method of determining a disk, the shape of the disk is determined by measuring the time required for the rotation of the loaded disk to reach a certain low-speed rotation. The disk is set to an appropriate rotation speed by determining whether the disk is eccentric.

[0006] In the above-described conventional disk discriminating method, the shape of the disk is determined based on the magnitude relationship of the disk mass. That is, since the mass of a disk-shaped disk with a diameter of 8 cm is different from that of a disk-shaped disk with a diameter of 12 cm, the time from the start of rotation until reaching a certain low-speed rotation is naturally different. (Especially the diameter). In this case, the determination of a deformed disk is made only when the time from the start of rotation until reaching a certain low-speed rotation is neither a disk-shaped disk with a diameter of 8 cm nor a disk-shaped disk with a diameter of 12 cm. It is determined that the disc is a disc.

[0007]

Therefore, for example, when the mass of a card-shaped irregular disk is substantially the same as the mass of a disk-shaped disk having a diameter of 8 cm, the irregular-shaped disk is also a disk-shaped disk having a diameter of 8 cm. There is a problem that the disc is determined to be present and may not be determined as a deformed disc.

In particular, in the early modified disk, the data area was formed in a continuous spiral shape as in the past, and only the plastic portion around the data area was modified, but recently, the data area itself is directly formed. There is also a commercially available disc shaped like a cut. When playing a deformed disk that has been cut to such a data area, it is necessary for the drive to recognize that it is a data recording area of such a shape and then perform recording and playback. An important issue is whether or not a deformed disc can be reliably determined at the time of loading.

The present invention has been made in order to solve such a problem, and an object of the present invention is to provide an information discriminating that a disc can be reliably determined to be a deformed disc even if the mass is almost the same as that of a normal disc-shaped disc. An object of the present invention is to provide a processing device. Another object of the present invention is to provide an information processing apparatus capable of determining whether or not a deformed disk is a deformed disk whose data area has been cut.

[0010]

In order to solve the above problems, an information processing apparatus according to the present invention is an information processing apparatus for recording data on an optical disk by an optical pickup or reproducing the recorded data. ,
Moving means for moving the optical pickup by a predetermined distance from the innermost position of the disk toward the outer periphery, and irradiation light from the optical pickup moved to the position of the data area of the innermost position of the disk is reflected by the optical disk. Level detecting means for detecting the level of the reflected light when the reflected light level based on the level of the reflected light detected by this level detecting means,
A criterion level setting means for setting a criterion level for determining whether or not the subsequent reflected light is a reflected light from the data area of the optical disk; and Monitoring the presence or absence of input of reflected light from the optical disk, and if the reflected light is intermittently input at an arbitrary position, disc determining means for determining that the shape of the loaded optical disk is irregular. And the disk determination means further comprises:
When it is determined that the shape of the optical disc is irregular due to intermittent input of reflected light, the reference level is compared with the level of reflected light intermittently input, and the reflected light level is higher than the reference level. When the height is high, it is determined that the shape of the data area itself is not a circular shape but an irregular shape.

According to the present invention having such features,
When the optical disk is loaded, the moving means moves the optical pickup to the innermost circumference of the disk, and starts moving the optical pickup at a constant distance from the position toward the outer circumference. At this time, the level detecting means detects the level of the reflected light when the irradiation light from the optical pickup moved to the position of the data area on the innermost circumference of the disk is reflected by the optical disk. The criterion level setting means sets a criterion level for determining whether or not subsequent reflected light is reflected light from the data area of the optical disk, based on the detected level of the reflected light. And so on.

That is, the level of light reflected from the data area of the optical disk differs depending on the type of the optical disk. For example, a read-only CD-ROM, a writable CD (CD-R), and a rewritable CD-RO
The level of light reflected from the data area differs from M (CD-RW). Therefore, each time an optical disk is loaded, the reflected light level of the data area of the optical disk is detected, and based on the detected level,
By setting the judgment reference level, it is possible to set an accurate judgment reference level suitable for the loaded optical disc. Here, the determination reference level is set to, for example, a level of about 80% of the detection level.

Each time the moving means moves the optical pickup by a predetermined distance, the disc judging means monitors the presence or absence of the input of reflected light from the optical disc. And when reflected light is intermittently input at an arbitrary position,
It is determined that the shape of the loaded optical disk is not a disk but an irregular shape. That is, a normal disc-shaped disc has either reflected light or no reflected light, and as long as the optical disc is disc-shaped, reflected light cannot be intermittently input.

Further, when the disc determining means determines that the shape of the optical disc is irregular due to intermittent input of the reflected light, the discrimination reference level stored in the memory and the intermittently input reflected light If the reflected light level is higher than the determination reference level, it is determined that the shape of the data area itself is not a circular shape but an irregular shape.
That is, intermittent input of reflected light higher than the determination reference level means that the data areas are not continuous. That is, it means that a part of the track of the data area, which should have been formed continuously in a spiral, is in a cut state. Therefore, the shape of the data area itself is also irregular. You can see that there is.

According to the information processing apparatus of the present invention, in the information processing apparatus for recording data on an optical disk by an optical pickup or reproducing the recorded data, the optical pickup is moved in a radial direction of the optical disk when the optical disk is loaded. Moving means for moving the optical pickup by the moving means to monitor the presence or absence of input of reflected light from the optical disk; if reflected light is intermittently input at an arbitrary position, the loaded A disc determining unit that determines that the shape of the optical disc is an irregular shape other than a disc shape.

According to the present invention having such features,
The disc determination means monitors the presence or absence of input of reflected light from the optical disc while moving the optical pickup in the radial direction of the optical disc by the moving means. When the reflected light is intermittently input at an arbitrary position, it is determined that the loaded optical disk is not a disk but an irregular shape. That is, a normal disc-shaped disc has either reflected light or no reflected light, and as long as the optical disc is disc-shaped, reflected light cannot be intermittently input.

Further, according to the information processing apparatus of the present invention, the disk moving means moves the optical pickup from the innermost position of the disk toward the outer circumference by a predetermined distance.

According to the present invention having such features,
Since the presence or absence of reflected light is determined each time while moving the optical pickup from the innermost position of the disk toward the outer periphery by a certain distance, compared to a case where the optical pickup is continuously determined while moving the optical pickup, The determination time is reduced.

Further, according to the information processing apparatus of the present invention, the level of the reflected light when the irradiation light from the optical pickup moved to the position of the data area on the innermost circumference of the disk is reflected by the optical disk is detected. Based on the level detecting means and the level of the reflected light detected by the level detecting means, a determination reference level for determining whether or not subsequent reflected light is reflected light from the data area of the optical disk is set. A determination reference level setting unit, wherein the disk determination unit further determines whether the optical disk has an irregular shape other than a disk shape by intermittently inputting reflected light. If the reflected light level is higher than the judgment reference level, the shape of the data area itself is not circular. And judging that the shape.

According to the present invention having such features,
The disc determination means further includes, when it is determined that the shape of the optical disc is not a disc shape due to the intermittent input of reflected light, the judgment reference level stored in the memory and the intermittently input reflection level. Compare with light level,
If the reflected light level is higher than the determination reference level, it is determined that the shape of the data area itself is not a circular shape but an irregular shape. That is, intermittent input of reflected light higher than the determination reference level means that the data areas are not continuous. In other words, it means that a part of the track of the data area that should have been formed continuously in a spiral shape is in a cut state,
This indicates that the shape of the data area itself is odd.

Further, according to the information processing apparatus of the present invention, when it is determined by the disk determining means that the loaded optical disk is not a disk, but a different shape, the subsequent recording or reproduction mode is not performed. The rotation speed of the optical disk is set to a standard speed or a safe speed.

That is, when the optical disk has an irregular shape, if the optical disk is rotated at a high speed, blurring or vibration occurs,
In the recording mode, data cannot be correctly recorded, and in the reproduction mode, the recorded data cannot be correctly reproduced. Therefore, when the loaded optical disk is a non-disc-shaped disk as in the present invention, by setting the rotation speed of the optical disk in the recording mode or the reproduction mode to a standard speed or a safe speed, Can be recorded or reproduced correctly.

[0023]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a system configuration diagram of a write-once optical disc apparatus which is an embodiment of the information processing apparatus of the present invention.

In FIG. 1, the output of an optical pickup 3 for writing data to the optical disk 1 and reading the written data is connected to a digital signal processing circuit 7 via an RF amplifier 5. The output is connected to a laser driver 8 that controls the laser output when writing and reading data by the optical pickup 3. The output of the servo processing circuit 9 is connected to a feed motor 4 for moving the optical pickup 3 in the radial direction of the optical disc 1 and a spindle motor 2 for rotating and driving the optical disc 1. And servo processing circuit 9
Is bidirectionally connected to a system controller 10 that controls the entire apparatus.

A DRAM 6 as a buffer for temporarily storing data actually read from the optical disk 1 is bidirectionally connected to the digital signal processing circuit 7. An EEPROM 11 for storing unique information such as laser power parameters is bidirectionally connected. Further, an interface controller (I / F controller) 12 for connecting to a host computer (not shown) is bidirectionally connected to the system controller 10 and the digital signal processing circuit 7.

The digital signal processing circuit 7 performs EFM modulation and demodulation and ACIRC (Advanced Cross Interleav
ed Reed-Solomon Code)
Processing such as dividing a 16-bit signal into 8 bits and converting the 8 bits into 14 bits is performed.

In the write-once optical disc apparatus having the above configuration, in this embodiment, when the optical disc 1 is loaded,
A judgment function for judging whether or not the loaded optical disc 1 has a disc shape, or conversely, whether or not the loaded optical disc 1 is a non-disc shaped disc is added. It has features.

That is, the system controller 10
When the optical disc 1 is loaded, a control signal is output to the servo processing circuit 9 to drive the feed motor 4, thereby moving the optical pickup 3 from the innermost position of the disk toward the outer periphery by a predetermined distance. Each time the optical pickup 3 moves by a certain distance, the digital signal processing circuit 7 detects the reflected light when the irradiation light from the optical pickup 3 is reflected by the optical disk 1 via the RF amplifier 5 and detects the light. The signal is output to the system controller 10.

The system controller 10 monitors the presence / absence of the detection signal from the digital signal processing circuit 7, and when the detection signal is intermittently input (that is, the reflected light from the optical disk 1 is intermittently input). In this case, it is determined that the loaded optical disc 1 is not a disk but an irregular shape.

The digital signal processing circuit 7 has a level detecting function for detecting the level of the reflected light when the irradiation light from the optical pickup 3 is reflected by the optical disk 1, and detects the level of the detected reflected light. Is output to the system controller 10.

The system controller 10 determines, based on the level of the reflected light detected by the digital signal processing circuit 7, whether or not the subsequently detected reflected light is reflected from the data area of the optical disk 1. The function of setting the judgment reference level is stored in the EEPROM 11.

When light is radiated from the optical pickup 3 toward the optical disk 1, the level of the reflected light depends on the level of the reflected light from the data area of the optical disk 1 and the level of the reflected light from a mere plastic part around the data area. There is naturally a level difference from the light level, and the level of the reflected light from the data area is higher than the level of the reflected light from the peripheral plastic portion. Therefore, the determination reference level is set to a level slightly lower than the level of the reflected light from the data area and higher than the level of the reflected light from the peripheral plastic portion. This makes it possible to determine whether the reflected light is reflected light from the data area or merely a reflected light from the peripheral plastic part.

Then, the system controller 10 monitors the level of the reflected light detected by the digital signal processing circuit 7, and when the reflected light from the optical disk 1 is intermittently inputted, the shape of the loaded optical disk 1 is changed. Is determined to be a non-disk-shaped variant, then EE
The determination reference level stored in the PROM 11 is compared with the reflected light level input from the digital signal processing circuit 7, and if the reflected light level is higher than the determination reference level, the shape of the data area itself of the optical disc 1 is changed. It is determined that the shape is not a normal circular shape.

That is, in the write-once optical disc apparatus of the present embodiment, it is not only possible to determine whether or not the loaded optical disc 1 is a deformed disc that is not a disc shape, but also that the data area itself of the optical disc 1 is a continuous spiral. It is also possible to determine whether or not the data area is a deformed data area that is not a shape. Hereinafter, specific examples are shown,
A method for determining a deformed disk in the write-once optical disk device of the present embodiment will be described.

[Embodiment 1] FIG. 2 is a flowchart for explaining a method of determining a deformed disk according to the first embodiment, FIGS. 3 and 4 are explanatory diagrams of a method of determining a deformed disk, and FIG. 5 is an optical disk. It is a wave form diagram of the reflected light reflected. In the first embodiment, an embodiment will be described in which it is determined whether or not the loaded optical disc 1 is a deformed disc that is not a disc shape. That is, in the first embodiment,
The level of the reflected light from the optical disk 1 is not considered.

When the optical disk 1 is loaded, the system controller 10 outputs a control signal to the servo processing circuit 9 to drive the feed motor 4, thereby moving the optical pickup 3 to the innermost circumference of the disk (step S1, step S1). In step S2), the disk is moved by a fixed distance from the innermost position to the outermost position (step S3). Then, every time the optical pickup 3 moves by a certain distance,
The digital signal processing circuit 7 detects the reflected light when the irradiation light from the optical pickup 3 is reflected by the optical disk 1 via the RF amplifier 5.

Here, assuming that the loaded optical disk 1 is a card-type optical disk 1a as shown in FIG. 3, the optical pickup 3 moves from the innermost position of the disk indicated by reference numeral 31a in the figure. , The outer peripheral side (in the figure, the symbol X
(In the direction indicated by) by a fixed distance T1. In this case, the optical pickup 3 has reference numerals 31b and 3b.
When the optical pickup 1 is at the position indicated by 1c, the irradiation light from the optical pickup 3 is always reflected by the optical disk 1a, so that the digital signal processing circuit 7 always detects the reflected light.

The system controller 10 constantly monitors the detection signal from the digital signal processing circuit 7. Therefore, the optical pickup 3 has the reference numerals 31b and 3b.
When it is at the position shown by 1c, the reflected light is detected continuously, and thus, Yes in step S4 and Y in step S5.
It is determined as es, and the process returns to step S3 to repeat the processing.

However, the optical pickup 3 has a reference numeral 31d.
When the optical disk 1a is moved to the position indicated by, as shown in FIG. 4, the angle of the optical disc 1a is changed from the rotational position indicated by the dashed line in the figure (indicated by reference numeral 1a1) to the rotational position indicated by the two-dot chain line in the figure (indicated by reference numeral 1a2) The optical disk 1a will be out of the position of the optical pickup 3 only while rotating in the Y direction by θ. That is, during this time, the irradiation light from the optical pickup 3 is not reflected by the optical disk 1a, and therefore, the digital signal processing circuit 7 does not detect the reflected light during this time. That is, in the digital signal processing circuit 7, as shown in FIG.
It will be detected intermittently. Symbols P1 to P in FIG.
4, P11 to P14 are the optical discs 1 given in FIG.
This corresponds to the point where the edge of “a” intersects with the optical pickup 3.

The system controller 10 constantly monitors the detection signal from the digital signal processing circuit 7. Therefore, when the optical pickup 3 is at the position indicated by the reference numeral 31d, the reflected light is intermittently detected.
It is determined Yes in step S4 and No in step S5, and the process proceeds to step S6. That is, FIG.
Since an intermittent signal waveform as shown in (a) is input, it is determined that the shape of the loaded optical disk 1a is not a disk but an irregular shape.

When the optical pickup 3 moves to the position indicated by the reference numeral 31e, the digital signal processing circuit 7
As shown in FIG. 5B, the reflected light from the optical disk 1a is intermittently detected. That is, the time when the optical pickup 3 is moved out by one, the irradiation light from the optical pickup 3 is not reflected on the optical disk 1a, and the non-reflection level time is longer than that in FIG. It is getting longer. However, in actual detection, when the optical pickup 3 moves to the position indicated by reference numeral 31d,
Since the intermittent signal waveform shown in FIG. 5A is obtained (No in step S5), the operation of moving the optical pickup 3 further to the outer peripheral side by a certain distance T1 to detect reflected light is performed. Is not performed.

If the system controller 10 determines that the loaded optical disk 1a is a deformed disk, then, when the system shifts to the recording mode or the reproduction mode, it changes the rotation speed of the optical disk 1a to the standard speed (1 × speed). ) Or a safe speed (about 2x speed or 4x speed). When the optical pickup 3 is moved to the outer peripheral side by the predetermined distance T1 and moved to a certain position, the reflected light that has been continuously detected until then is not detected at all (No in step S4). Is determined), it is determined that the loaded optical disk is a normal disk-shaped disk (step S7).

[Embodiment 2] FIG. 6 is a flowchart for explaining a method for judging a deformed disk according to the second embodiment, FIGS. 7 and 8 are explanatory diagrams of a method for judging a deformed disk, and FIG. 9 is an optical disk. It is a wave form diagram of the reflected light reflected.

In the second embodiment, the loaded optical disc 1
When it is determined whether the shape of the optical disk 1 is a deformed disk that is not a disk shape, one step further proceeds, and whether the shape of the data area of the optical disk 1 is a continuous spiral shape,
An embodiment will be described in which it is also determined whether the shape is not a continuous spiral shape but an irregular shape. That is, in the second embodiment,
The level of light reflected from the optical disc 1 is also taken into consideration.

When the optical disk 1 is loaded, the system controller 10 outputs a control signal to the servo processing circuit 9 to drive the feed motor 4, thereby moving the optical pickup 3 to the innermost position of the disk (step). S11, step S12). Then, the level of the reflected light when the irradiation light from the optical pickup 3 moved to the position of the data area on the innermost circumference of the disc is reflected by the optical disc 1 is converted into a digital signal processing circuit 7 via the RF amplifier 5.
(Step S13), and outputs a signal indicating the level of the detected reflected light to the system controller 10.

The system controller 10 determines, based on the level of the reflected light detected by the digital signal processing circuit 7, whether or not the subsequently detected reflected light is reflected from the data area of the optical disk 1. Is set, and the set reference level L1 is set.
1 is stored in the EEPROM 11 (step S14).
The determination reference level L1 is set to, for example, about 80% of the level of the detected reflected light. However, as described above, the determination reference level L1 set here needs to be set to a level higher than the level L3 of the reflected light from the peripheral plastic part without data.

As shown in FIG. 7, the shape of the loaded optical disk 1 is such that the entire disk is a data area, and the left and right sides of the circular data area are cut in parallel. Assuming that the optical disk 1b is the optical disk 1b, the optical pickup 3 is moved by a fixed distance T1 from the innermost position of the disk indicated by reference numeral 41a in the figure toward the outer peripheral side (the direction indicated by reference numeral X in the drawing) (step S
15). In this case, when the optical pickup 3 is at the positions indicated by reference numerals 41b and 41c,
Is constantly reflected by the optical disk 1b,
The digital signal processing circuit 7 always detects the reflected light.

The system controller 10 constantly monitors the detection signal from the digital signal processing circuit 7. Therefore, the optical pickup 3 is designated by reference numerals 41b and 4b.
When it is at the position indicated by 1c, since the reflected light is continuously detected, Yes in step S16 and step S17
Is determined to be Yes, the process returns to step S15, and the process is repeated.

However, the optical pickup 3 has a reference numeral 41d.
When the optical disk 1b is moved to the position indicated by, as shown in FIG. 8, the angle of the optical disk 1b is changed from the rotational position indicated by the dashed line in the figure (indicated by reference numeral 1b1) to the rotational position indicated by the two-dot chain line in the figure (indicated by reference numeral 1b2). The optical disk 1b will be out of the position of the optical pickup 3 only while rotating in the Y direction by θ. That is, during this time, the irradiation light from the optical pickup 3 is not reflected by the optical disk 1b, and therefore, the digital signal processing circuit 7 does not detect the reflected light during this time. That is, the digital signal processing circuit 7 intermittently detects the reflected light from the optical disk 1b as shown in FIG.

The system controller 10 constantly monitors the detection signal from the digital signal processing circuit 7. Therefore, when the optical pickup 3 is at the position indicated by the reference numeral 41d, the reflected light is intermittently detected.
It is determined Yes in step S16 and No in step S17, and the process proceeds to step S18. That is, since an intermittent signal waveform as shown in FIG. 9 is input, it is determined that the shape of the loaded optical disk 1b is not a disk shape but an irregular shape. Up to this point, the operation is the same as in the first embodiment.

If it is determined in step S18 that the optical disk 1b has an irregular shape, the system controller 10 then determines the determination reference level L1 stored in the EEPROM 11 and the digital signal processing circuit 7
Is compared with the level L2 of the reflected light input from (step S19). If the level L2 of the reflected light is higher than the determination reference level L1 (L1 <L2), the operation proceeds from step S19 to step S20, and the shape of the data area of the optical disc 1b is not a circular shape. Is determined.

That is, the fact that the data area itself is irregular means that, for example, when data is reproduced from the optical disk 1b, the data area 1b5 (see FIG. 7) that can be continuously reproduced and the data area that cannot be continuously reproduced. 1b6
(See FIG. 7). Therefore, in the write-once optical disc device, it is necessary to perform a reproducing operation in consideration of this. Therefore, when it is determined that the optical disk 1b is a deformed disk, the determination as to whether or not the data area of the optical disk 1b is a deformed shape is made to smoothly proceed to the subsequent recording mode or reproduction mode. This is a necessary judgment.

In step S19, the level L2 of the reflected light is lower than the determination reference level L1 (L1> L).
When it is determined as 2), the operation proceeds to step S21, and it is determined that the data area itself of the optical disc 1b is circular (continuous spiral shape).

When the optical pickup 3 is moved to the outer peripheral side by a predetermined distance T1 and moved to a certain position, the reflected light which has been continuously detected until then is not detected at all (step S1). If No in S16), it is determined that the loaded optical disk is a normal disk-shaped disk (step S2).
2).

The optical disk 1 thus loaded is
If it is determined that b is a deformed disk, the system controller 10 then sets the rotation speed of the optical disk 1b to the standard speed (1 × speed) or the safe speed (2 × speed or 4 × About double speed).

In the second embodiment, as an example of the optical disk 1, as shown in FIG. 7, the entire disk is a data area, and both right and left sides of the circular data area are cut in parallel. Although the optical disk 1b is shaped as an example, when the optical disk 1c is a deformed optical disk as shown in FIG. 10 (that is, the outer peripheral shape of the disk is substantially square, and the data area (shown with diagonal lines)) Is also irregular), the waveform of the reflected light detected by the digital signal processing circuit 7 is as shown in FIG.

The waveform shown in FIG. 11 is a waveform when the optical pickup 3 is moved to the position indicated by reference numeral 51e in FIG. As described above, in the deformed disk having the shape shown in FIG. 10, the waveform of the reflected light includes the non-reflection level at which the reflected light does not return at all, the level L3 of the reflected light from the plastic portion around the data area, and the data area. And the level L2 of the reflected light from the light source. Even in this case,
Since the determination reference level L1 is set to “L3 <L1 <L2”, the system controller 10 determines that the optical disk 1c is a deformed disk (determination based on the presence or absence of reflected light) and the data area of the optical disk 1c. Both determinations of a variant can be made.

In the first embodiment, a card-shaped disk is exemplified as an example of a deformed disk. Can be determined.

[0059]

According to the information processing apparatus of the present invention, the criterion level setting means determines whether or not subsequent reflected light is reflected light from the data area of the optical disk based on the detected reflected light level. In this case, a determination reference level for determining whether or not is set is set. That is, since the level of light reflected from the data area of the optical disk differs depending on the type of the optical disk, every time the optical disk is loaded,
Detecting the reflected light level of the data area of the optical disc,
By setting the judgment reference level each time based on the detection level, an accurate judgment reference level suitable for the loaded optical disc can be set each time. Also, the disc determining means monitors the presence or absence of the input of reflected light from the optical disc every time the optical pickup is moved by a fixed distance by the moving means, and when the reflected light is intermittently input at an arbitrary position, In addition, the configuration is such that the loaded optical disk is determined to be an irregular shape other than a disk shape. That is, a normal disc-shaped disc has either reflected light or no reflected light, and as long as the optical disc is disc-shaped, reflected light cannot be intermittently input. Therefore, according to the disk determination method of the present invention, all odd-shaped disks can be determined. Further, when the disc determining means determines that the shape of the optical disc is irregular due to intermittent input of the reflected light, the discrimination reference level stored in the memory and the reflected light level intermittently input are used. Are compared, and if the reflected light level is higher than the determination reference level, it is determined that the shape of the data area itself is not a circular shape but an irregular shape. In other words, intermittent input of reflected light higher than the determination reference level means that the data area is not continuous, and this indicates that the shape of the data area itself is circular (continuous spiral). Shape) or an irregular shape.

Further, according to the information processing apparatus of the present invention, the disc judging means monitors the presence or absence of the input of the reflected light from the optical disc while moving the optical pickup in the radial direction of the optical disc by the moving means, and When the reflected light is intermittently input at the position, the loaded optical disk is determined to have a shape other than a disk shape and an irregular shape. That is, a normal disc-shaped disc has either reflected light or no reflected light, and as long as the optical disc is disc-shaped, reflected light cannot be intermittently input. Therefore, according to the disk determination method of the present invention, all odd-shaped disks can be determined.

Further, according to the information processing apparatus of the present invention, the disk moving means is configured to move the optical pickup by a fixed distance from the innermost position of the disk toward the outer periphery. That is, while moving the optical pickup from the innermost position of the disk toward the outer periphery by a certain distance, each time, the presence or absence of reflected light is determined.
The determination time is shortened as compared with the case where the determination is continuously performed while moving the optical pickup.

Further, according to the information processing apparatus of the present invention, when the disc determining means determines that the shape of the optical disc is not a disc shape due to intermittent input of reflected light, the disc determination means stores the information in memory. The stored reference level,
By comparing the intermittently input reflected light level, if the reflected light level is higher than the determination reference level, it is determined that the shape of the data area itself is not a circular shape but an irregular shape. That is, the intermittent input of the reflected light higher than the determination reference level means that the data area is not continuous. Therefore, the shape of the data area itself is circular (continuous spiral). Shape)
It can be determined whether it is a variant.

Further, according to the information processing apparatus of the present invention, when it is determined by the disk determination means that the loaded optical disk is not a disk but an irregular shape,
The rotation speed of the optical disc in the subsequent recording or reproduction mode is set to a standard speed or a safe speed. In other words, if the optical disc has an irregular shape, if it is rotated at high speed, it will shake or vibrate, etc., and it will not be possible to record data correctly in the recording mode. If the loaded optical disk is a non-disk-shaped irregular disk as in the present invention, the rotation speed of the optical disk in the recording mode or the reproduction mode is set to the standard speed or the safe speed. By setting, data can be recorded or reproduced correctly.

[Brief description of the drawings]

FIG. 1 is a system configuration diagram of a write-once optical disc apparatus which is an embodiment of an information processing apparatus according to the present invention.

FIG. 2 is a flowchart for explaining a method of determining a deformed disk according to the first embodiment;

FIG. 3 is an explanatory diagram for explaining a method of determining a deformed disk according to the first embodiment;

FIG. 4 is an explanatory diagram for explaining a method of determining a deformed disk according to the first embodiment;

FIG. 5 is a waveform diagram of reflected light reflected from the optical disc by the method for determining a deformed disc according to the first embodiment.

FIG. 6 is a flowchart for explaining a method of determining a deformed disk according to the second embodiment.

FIG. 7 is an explanatory diagram for explaining a method of determining a deformed disk according to the second embodiment.

FIG. 8 is an explanatory diagram for explaining a method of determining a deformed disk according to the second embodiment.

FIG. 9 is a waveform diagram of light reflected by an optical disk according to the method for determining a deformed disk according to the second embodiment.

FIG. 10 is an explanatory view showing another example of a modified disk.

FIG. 11 is a waveform diagram of light reflected by the modified disk shown in FIG.

[Explanation of symbols]

 1 (1a, 1b, 1c) Optical disk 2 Spindle motor 3 Optical pickup 4 Feed motor 5 RF amplifier 6 DRAM 7 Digital signal processing circuit 8 Laser driver 9 Servo processing circuit 10 System controller 11 EEPROM 12 I / F controller

Claims (5)

[Claims] 1. An information processing apparatus for recording data on an optical disk by an optical pickup or reproducing the recorded data, wherein, when the optical disk is loaded, the optical pickup is moved a predetermined distance from an innermost position of the disk toward an outer peripheral side. Moving means for moving the optical disk at a time, and level detecting means for detecting the level of reflected light when the irradiation light from the optical pickup moved to the position of the data area on the innermost circumference of the disk is reflected by the optical disk; A criterion level setting means for setting a criterion level for determining whether or not subsequent reflected light is reflected light from the data area of the optical disk based on the level of the reflected light detected by the means; Each time the optical pickup is moved by a predetermined distance by a moving means, the input of the reflected light from the optical disc is Monitoring the absence of the disc, and when the reflected light is intermittently input at an arbitrary position, disc discriminating means for judging that the shape of the loaded optical disc is an irregular shape other than a disc shape, Further, when it is determined that the shape of the optical disc is irregular due to intermittent input of reflected light, the reference level is compared with the intermittently input reflected light level, and the reflected light level is determined. An information processing apparatus characterized by determining that the shape of a data area itself is not a circular shape but an irregular shape when the level is higher than a reference level. 2. An information processing apparatus for recording data on an optical disk by an optical pickup or reproducing the recorded data, comprising: moving means for moving the optical pickup in a radial direction of the optical disk when the optical disk is loaded; Monitoring the presence or absence of input of reflected light from the optical disk while moving the optical pickup, and when the reflected light is intermittently input at an arbitrary position, the shape of the loaded optical disk is not a disk shape An information processing apparatus comprising: a disk determination unit that determines that the disk is irregular. 3. The information processing apparatus according to claim 2, wherein the disk moving means moves the optical pickup from the innermost position of the disk toward the outer circumference by a predetermined distance. 4. A level detecting means for detecting a level of reflected light when the irradiation light from the optical pickup moved to the position of the data area on the innermost circumference of the disk is reflected by the optical disk; A criterion level setting means for setting a criterion level for determining whether or not subsequent reflected light is reflected light from the data area of the optical disc based on the level of the detected reflected light, The disc determining means may further include, when it is determined that the shape of the optical disc is irregular due to the intermittent input of reflected light, comparing the determination reference level with the level of intermittently input reflected light. 3. The method according to claim 2, wherein when the light level is higher than the determination reference level, it is determined that the shape of the data area itself is not a circular shape but an irregular shape.
An information processing apparatus according to claim 1. 5. When the disc discriminating means judges that the loaded optical disc has an irregular shape, the rotation speed of the optical disc in a subsequent recording or reproducing mode is set to a standard speed or a safe speed. The information processing apparatus according to claim 1, wherein: