JPH11213530A - Optical disk recording and reproducing device and optical disk discriminating method therefor and detection method for optical disk mischucking - Google Patents

Abstract

PROBLEM TO BE SOLVED: To discriminate the kind of the optical disk inserted into a recording and reproducing device by detecting a sum signal and a focus error signal which are to be generated with respect to respective laser beams whose wavelengths are different and using these detected two signals. SOLUTION: Phisical characteristics of various kinds of optical disks including their reflectivities are different by the difference of their structures and this device is a device which discriminates kinds of the optical disks by utilizing these differences. This device discriminates a CD, a CD-R, a CD-RW, a one layered DVD, a two layered DVD, whether a disk is the disk provided with a cartridge or not, whether a disk is the disk of 8-cm or 12-cm by prescribed logics while using data such as the discrimination of a disk, the presence or absence of a cartridge, the detection of a mischucking (absence of a disk) the presence or absence of an FOK signal in a laser of 780 nm for CD and a laser of 650 nm for DVD, amplitude and focus error signal amplitude ratios of FEs in both wavelength lasers (FEDVD/FECD) and the difference between sum signal levels and so forth.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disk recording / reproducing apparatus for reading and reproducing recorded information from an optical disk having information recorded on a disk-shaped recording medium. An optical disk recording / reproducing device capable of recording / reproducing an optical disk contained in a cartridge, discriminating the type of the disk inserted into the optical disk recording / reproducing device, and further detecting mis-chucking. The present invention relates to an optical disk discrimination method and an optical disc mischucking determination method.

[0002]

2. Description of the Related Art Conventionally, an optical disk recording / reproducing apparatus for optically reading and reproducing recorded information from an optical disk which is an optical information recording medium on which information is recorded by forming pits or the like on a disk-shaped disk. Is, for example, a CD
Various types are known, and have already been put to practical use. Particularly, in recent years, as an optical recording medium capable of recording a large amount of information by increasing its information recording density, for example, a so-called DVD (digital video disc) has been proposed and attracted attention. A part of the reproducing apparatus for reproducing is already commercially available.

[0003] By the way, a CD or a DVD is
A ROM or the like is usually mounted on a tray as a single disk and inserted into the apparatus. In particular, in the case of a DVD-RAM, for example, as shown in the attached FIG. In some cases, the cartridge C needs to be mountable on the tray TR. In order to cope with both forms of the disk (a form used as it is and a form used in a cartridge), the tray TR is provided with a guide groove G1 for a single disk, which is substantially equal to the disk diameter of 8 cm and 12 cm. G
2 are provided, and claws for fixing the cartridge are provided.

[0004] In addition, the DVD achieves a large capacity by increasing the recording density by reducing the track pitch and the shortest pit length to 1/2 or less as compared with the CD. Therefore, the spot size of the light beam is changed from about 1.6 μm of the CD to 0.1 μm.
It is necessary to narrow down to about 8 μm. Therefore, in the case of a CD, an optical head composed of a laser having a wavelength of 780 nm and an objective lens having an NA of 0.4 to 0.5 is used, and in the case of a DVD, a laser having a wavelength of 650 nm and NA = 0. An optical head composed of about 0.6 objective lens is used.

[0005] Further, such DVDs and CDs include, for example,
A recording medium (DVD-R capable of only reproducing recorded information)
OM, CD-ROM), various types of recording media such as recording media (CD-R) capable of recording once, and recording media (DVD-RAM, CD-RW) capable of recording multiple times. Has been proposed. In addition, in these various recording media,
In particular, its characteristics are different in its reflectance and the like.

[0006]

As described above, in recent years, the above-mentioned various types of recording media have become widespread. With this, recorded information is reproduced from such recording media or information is reproduced. For an optical disk recording / reproducing apparatus for recording, even for these various recording media,
It is required to exhibit optimal information recording / reproducing functions. However, in the method of determining the type of the inserted disk based only on the amount of reflection with respect to the irradiation laser beam as in the above-described related art, it has been difficult to make accurate and detailed determination.

That is, as described above, in recent years, different types of discs (for example, CD and DVD) which perform recording / reproduction using different laser beams, respectively,
Due to its characteristics, there are a plurality of types of disks (for example, in the case of a CD, a CD-ROM,
D-RW, CD-R: DVD-RA for DVD
M, one layer of DVD-ROM, two layers of DVD-ROM, etc.) and accurately discriminating the types of these discs, and thereby setting the apparatus optimally for the recording / reproducing operation, are extremely difficult in the above-mentioned conventional technology. It was difficult. Further, in the above-described conventional apparatus, the state where the optical disc inserted into the apparatus is not completely chucked, that is, detection of mis-chucking or the like is not considered, and detection of such mis-chucking is not considered. It was impossible.

In view of the above-mentioned problems in the prior art, the present invention is based on the above-mentioned problems. That is, a variety of optical disks, which have been widely used in recent years, are distinguished by their characteristics, including discrimination based on the recording / reproducing laser wavelength. It is therefore an object of the present invention to provide an optical disk recording / reproducing apparatus capable of further discriminating the type thereof and an optical disk determining method therefor.

Further, in the present invention, in addition to the above-described optical disk recording / reproducing apparatus and the optical disk discriminating method therefor, again, various types of optical disks are classified according to their characteristics including the discrimination based on the recording / reproducing laser wavelength. It is another object of the present invention to provide another optical disc discriminating method for fine discrimination, and a method for detecting an optical disc mischucking that can detect an optical disc mischucking.

[0010]

Therefore, in order to achieve the above-mentioned object, the present invention provides, first,
An optical disc recording / reproducing device capable of recording / reproducing recording information by at least two kinds of laser beams having different wavelengths, wherein the optical disc recording / reproducing device generates a recording information based on a reflection amount of the laser beam on an inserted optical disc surface. Means for generating a sum signal and a focus error signal, and further detecting the generated sum signal and the focus error signal for each of the laser beams having different wavelengths, and detecting the detected sum signal and the focus error signal. An optical disc recording / reproducing apparatus comprising means for determining a type of an optical disc inserted into the recording / reproducing apparatus based on the sum signal and the focus error signal by laser beams having different wavelengths.

Further, according to the present invention, the optical disk recording / reproducing apparatus can further comprise means for detecting mis-chucking of the optical disk inserted into the recording / reproducing apparatus.

According to the present invention, the optical disk recording / reproducing apparatus further determines the type of the optical disk inserted into the recording / reproducing apparatus based on the number of zero crossings of the obtained focus error signal. It is also possible to provide a means for performing.

According to the present invention, in order to achieve the above-mentioned object, the type of an optical disk inserted into an optical disk recording / reproducing apparatus capable of performing recording / reproducing operations with at least two kinds of laser beams having different wavelengths. A discrimination method for discriminating, wherein a sum signal and a focus error signal generated by the optical disc recording / reproducing apparatus based on the amount of reflection of the laser light on the optical disc surface are compared for each of the laser lights having different wavelengths. There is provided an optical disc discriminating method for discriminating a type of an optical disc inserted into the recording / reproducing apparatus based on the detected sum signal and the focus error signal by the detected laser beams having different wavelengths.

According to the present invention, in the above-described optical disk determination method, further, the type of the optical disk inserted into the recording / reproducing apparatus is determined based on a ratio of the focus error signals by the laser beams having different wavelengths. It is also possible.

Further, according to the present invention, there is provided a method for determining the type of an optical disk inserted into an optical disk recording / reproducing apparatus capable of performing recording / reproducing operations with at least two kinds of laser beams having different wavelengths, An optical disc discriminating method for discriminating a type of an optical disc inserted into the recording / reproducing apparatus based on the number of zero crossings of a focus error signal generated by the optical disc recording / reproducing apparatus based on a reflection amount of a laser beam on a surface. Provided.

In addition, according to the present invention, in order to achieve the above-mentioned object, mis-chucking of an optical disk inserted into an optical disk recording / reproducing apparatus capable of performing recording / reproducing operations with at least two kinds of laser beams having different wavelengths. A focus sweep operation of the optical head of the optical disk recording / reproducing apparatus with respect to each of the two types of laser beams having different wavelengths, and discriminating mis-chucking of the optical disk based on a result of the focus sweep operation. The present invention provides a method for detecting mis-chucking of an optical disc.

According to the present invention, in the above-mentioned method for detecting mis-chucking of an optical disk, the focus sweep operation is first performed by using a laser beam having a long wavelength among the plurality of types of laser beams, and thereafter, a laser beam having a short wavelength is used. The focus sweep operation can be performed by light.

[0018]

Embodiments of the present invention will be described below with reference to the accompanying drawings. First, FIG. 6 of the accompanying drawings shows a schematic configuration of an optical disc recording / reproducing apparatus capable of recording information on various optical discs or reproducing the recorded information according to an embodiment of the present invention. It is shown.

In FIG. 6, reference numeral 100 denotes an optical disk which is a medium placed on a tray or the like and inserted into the apparatus for recording or reproduction by the apparatus. The optical disc 100 has, for example, a disk shape as shown in FIG. Reference numeral 200 denotes a semiconductor laser 210, which is a light emitting element that generates laser light of a desired wavelength, a condensing optical lens 220 that converts emitted laser light into parallel light, and a part of incident light. A half mirror 230 that passes and reflects another part, a mirror 240 for changing the direction of light,
A focus lens 250 for irradiating the recording surface of the high-density recording medium 100 with a laser beam converging to a predetermined beam diameter, a light receiving element 260 for receiving and detecting reflected light from the half mirror 230, and the like. 2 shows an optical pickup as an optical reproducing means.

In the present invention, although not shown,
The optical pickup 200 has a laser beam (780 n for CD) having two wavelengths corresponding to the CD and DVD.
m and 650 nm for DVD), two types of semiconductor lasers are mounted. Also, for example, FIG.
As shown in FIG. 2, the objective lens for the semiconductor laser has a structure in which the objective lens can be appropriately switched by rotating in the radial direction of the disk.

Also, in FIG.
Is a signal processing section for detecting light by the light receiving element 260 of the optical reproducing means, converting reflected light into an electric signal, and performing predetermined processing. The signal processing section 300 is an optical information recording medium reproducing apparatus. The microcomputer 400 is connected to a microcomputer 400 provided for controlling the entire system, and performs various controls. That is, this microcomputer 400
The laser drive circuit 500 and the feed control circuit 60
0, a spindle control circuit 700 and a two-dimensional actuator control circuit 800.

That is, with the above-described configuration, the microcomputer 400 can operate the semiconductor laser 210 as a light-emitting element of the optical pickup 200 as the optical reproducing means.
The current supplied to the optical reproducing unit 200 is controlled by controlling the emission intensity by controlling the current supplied to the optical reproducing unit 200 and controlling the rotation of the motor 650 for feed control.
Control the position in the 0 radial direction. Reference numeral 660 in the figure is
A gear for moving the optical pickup 200 in the radial direction by rotation of the feed control motor 650 is shown.

Also, the microcomputer 400
Controls the rotation of a motor 750 that rotationally drives a spindle, and controls the focus position of the focus lens 250 of the optical pickup 200 by the two-dimensional actuator control circuit 800. For example, the electromagnetic coil 850 or the like is used as the operating means. It is realized by electromagnetic action. The two-dimensional position control of the focus realized by the two-dimensional actuator control circuit 800 is, in addition to the position control of the focus lens 250 in the direction perpendicular to the recording surface of the high-density recording medium 100, Further, tracking position control for following a track by minute position adjustment in a radial direction perpendicular to the above is included.

Next, FIG. 9 shows the optical disk recording / reproducing apparatus according to the present invention, in particular, the light receiving element 260 of the optical pickup 200, the signal processing section 300 for processing the output signal thereof, and A detailed circuit configuration including a peripheral portion is shown.

As shown in FIG.
Is divided into, for example, four detectors A, B, C, and D, and the reflected light reflected on the recording surface of the optical disc 100 and incident on the light receiving element 260 is detected by each of the divided detectors. Each is converted into an electric signal and output. The output from each of the divided detection units A, B, C, and D is input to addition circuits 303 and 304, and (A
+ D) and (B + C) are added. Further, the outputs (A + D), (B +
C) is input to the addition circuit 307, whereby a sum signal of (A + B + C + D) obtained by adding all the outputs from the detection units A, B, C, and D is output.

Each of the four detectors of the light receiving element 260 converts the detected light amount into an electric signal, that is, a voltage signal, and outputs the electric signal. It should be noted that these detectors generate a current proportional to the amount of received light.
Each of them is converted into a voltage signal of an appropriate level by a circuit 301 called a / V (current / voltage) converter and output. Note that, specifically, by changing the conversion resistance value (I / V resistance), it is possible to arbitrarily set the voltage value with respect to the current.

On the other hand, the signals (A + D) and (B + C) output from the adders 303 and 304 are
11 to obtain (A + D)-(B + C) to obtain a focus error signal FE. Further, similarly to the addition circuit 307, a gain setting switching signal from the microcomputer 400 is input to the subtraction circuit 311 so that the amplitude value of the focus error signal FE can be arbitrarily set. The focus error signal FE is input to the FE amplitude detection circuit 305 to determine the amplitude value of the focus error signal FE, and the amplitude value is input to the microcomputer 400.

The sum signal from the adding circuit 307 is FO
The signal is input to the K signal detection circuit 306. The FOK signal detection circuit 306 includes the microcomputer 40
When the FOK slice level switching signal is input from 0, the FOK signal detection circuit 306 compares the sum signal with a certain voltage level set by the FOK slice level switching signal, and the sum signal is larger than the above voltage level. A FOK signal which is at H level and becomes L level when it is small is generated and input to the microcomputer 400. Although not shown, the TR signal for controlling the tracking is supplied to the feed control circuit 60 shown in FIG.
By 0, the position of the optical reproducing means 200 in the radial direction is controlled.

The focus error signal FE described above
For example, in a DVD recording / reproducing operation, a switching circuit (not shown) separates and processes the focus control signal in the land area and the focus control signal in the groove area. Then, by the output,
The two-dimensional actuator control circuit 800 shown in FIG.
The focus position of the focus lens 250 of the optical reproducing means 200 (in the direction perpendicular to the recording surface of the optical disc 100) is controlled via the.

Here, as the optical disk determined by the optical disk determination method executed in the optical disk recording / reproducing apparatus of the present invention, a CD (compact disk) is a CD-RO capable of only reproducing recorded information.
M, a CD-R that can be recorded once, and a rewritable CD-RW. Also, this CD-ROM has a size of 8 cm and a size of 1 cm depending on the size (diameter).
There are 2 cm ones.

On the other hand, as a DVD which is a high-density recording medium, there is a DVD-ROM capable of only reproducing recorded information. This DVD-ROM also has a single-layer DV.
There are a D-ROM and a DVD-ROM having a two-layer structure. In addition, DVD-ROMs having a single-layer structure are also different depending on the size (diameter) of 8 cm and 12 cm.
Things exist. In the following description, a DVD-ROM having a single-layer structure is simply referred to as “DVD-ROM”, and a DVD-ROM having a two-layer structure is referred to as “DVD-ROM (2
Layer). This DVD also has a DVD-RAM that can be recorded a plurality of times.

According to the optical disk recording / reproducing apparatus of the present invention, these many types of optical disks can be reliably identified. In addition, in these various recording media,
Due to differences in the structure and the like, physical characteristics including the reflectance are different. Usually, the CD-R
The OM or the like is inserted into the apparatus by itself as an optical disc to perform a recording / reproducing operation. For example, in a DVD-RAM, a part of the OM is inserted into the apparatus while being inserted into a transparent case called a cartridge. A recording / reproducing operation is performed.

Differences in characteristics between these various optical disks are shown in FIGS. Hereinafter, each will be described. FIG. 10 shows various types of optical disks on the horizontal axis, and shows the rise time of the spindle of the apparatus when each optical disk is mounted. Here, the rising time of the spindle when no optical disk is inserted is also indicated by “no”. As is apparent from the above, especially, an optical disk of a DVD or CD having a large diameter, that is, a DVD or CD having a diameter of 12 cm, has a longer rise time of the spindle than a DVD-ROM or CD-ROM having a diameter of 8 cm. ing.

Next, FIG. 11 shows a sum signal obtained by detecting the above various optical disks with a laser beam (wavelength of 780 nm) for a CD.
-It can be seen that the signal level of DVD-ROM, CD-ROM, CD-R is higher than that of RAM, DVD-ROM (two layers), CD-RW, etc. FIG.
Reference numeral 2 shows a Japanese parent symbol obtained by detecting the above various optical disks with a DVD laser beam (wavelength 650 nm). From now on, DVD-RAM, DVD
DVD-ROM (2
Layer), the sum signal level in the DVD-ROM is lower, and the sum signal level in the CD-R is lower than that.

FIG. 13 shows the amplitudes of the focus error (focus error) signals FE obtained by the laser light for CD and the laser light for DVD with respect to the various optical disks, respectively. Plotted by “●” and “○”. Further, FIG.
The ratio (FEDV) of the focus error signal amplitude obtained by the DVD laser light to the focus error signal amplitude obtained by the CD laser light for the various optical disks shown on the horizontal axis.
D / FECD) is shown. In the present invention, the type is discriminated by utilizing the difference between the characteristics of the various optical disks described above, and the details will be described later in detail.

Next, an optical disc discriminating method in the optical disc recording / reproducing apparatus whose detailed structure has been described above will be described in detail with reference to the flowcharts of FIGS. This discrimination of the optical disc is appropriately performed when it is necessary to discriminate the type of the optical disc for recording or reproducing information, for example, when the apparatus is turned on.

First, FIG. 1 is a flow chart showing an outline of an optical disk discriminating method performed in the optical disk recording / reproducing apparatus. As is clear from this figure, when an optical disk is inserted into the optical disk recording / reproducing apparatus, this is detected (step S1), and thereafter, whether or not a cartridge is present is detected (step S2). Here, as described above, some DVD-RA
In the case of M, there is a type in which a disc is stored in a cartridge and used.

If it is detected in step S2 that a cartridge is present, the DVD-R
It is determined to be AM (step S3). On the other hand, if it is determined in step S2 that there is no cartridge, the absence of a mis-chucking disk, which will be described in detail later, is detected (step S4). In step S4, if the optical disk is not sufficiently fitted into the disk chuck of the apparatus, that is, if the disk is mis-chucking, or if there is no disk with no optical disk inserted (“Yes”), The absence of the mis-chucking disk is detected and the process ends (step S5).

On the other hand, if it is determined as "No" in the detection of the absence of the mis-chucking disk (step S4), this will also be described in detail later. S6) is performed, and the discrimination process ends (step S7).

Next, FIG. 2 shows details of the detection of the absence of the mis-chucking disk (step S4). First, when the mis-chucking / no-disk detection process starts (step S41), the optical head is moved to the inner circumference of the disk (step S42), and then initialization is performed (step S43). In this initial setting, specifically, for example, the above-mentioned I / V resistance value, the value of the sum signal for detecting the FOK signal (FOK signal detection level)
Are set to predetermined values, or flags FLG1 and FLG2 used below are set to “0”. After that, the objective lens 250 of the optical head is switched to a CD objective lens, and the semiconductor laser serving as a light emitting source is also used as a CD laser 78.
The laser of 0 nm is turned on (step S44). Thereafter, the focus sweep moves the objective lens 250 in the focus direction, that is, in the vertical direction (more strictly, in the direction perpendicular to the information recording surface of the optical disc) via the two-dimensional actuator control circuit 800 described above. The operation is performed (step S45). In the detection of the absence of the mis-chucking disk, the focus sweep operation is first performed by the 780 nm laser for the CD in order to protect the inserted disk from data destruction. Specifically, when a 650 nm laser for DVD is irradiated on a non-rotating CD-R or the like, data recorded on the recording surface may be lost,
Therefore, first, the above-described focus sweep operation is performed by a safe 780 nm laser for CD.

Next, it is determined whether an FOK signal has been obtained by the focus sweep operation (step S46). At this time, in order to determine whether or not this FOK signal has been obtained, the sum signal (A + B + C + D) of the signal processing unit 300 shown in FIG.
For example, an FO set to about 0.4 V (= 400 mV)
This is performed by comparing with the K signal detection level. According to this, as shown in FIG.
Except for the disc, the other discs can obtain the focus state. Therefore, this determination step S46
In the case of "no", it is highly probable that the type of the disc mounted on the apparatus is a DVD-RAM.

Next, as described above, the judgment step S4
6, if “no”, FLG1 = 1
Is determined (step S47), and as a result,
When FLG1 is not 1 (in the case of “no”), the gain is reset and FLG1 is changed to 1 (step S48), and thereafter, the process returns to step 45 again, whereby Focus sweep operation and FO
The detection of the K signal is performed again.

On the other hand, when it is determined that FLG1 = 1 in the above determination step S47,
It is determined whether FLG2 = 1 (step S4)
9). If the result of this determination is "yes", it is determined that there is no mis-chucking disk, for example, that fact is displayed on the display device of the device, and the process is terminated (step S50). In particular, in this mis-chucking state, for example, as shown in FIG. 15 attached, the optical disc 100 is not fitted into the chucking member 900 of the apparatus, and therefore, the position of the optical disc 100 is higher than the original position. Is also high and the clamper 95
0 does not fall to the predetermined position.

If the determination in step S49 is "no", the gain is reset, FLG2 is changed to 1 (step S51), and the objective lens 250 of the optical head is set to DVD. Switch to the objective lens for DVD, and the semiconductor laser as the light source
After the 50 nm laser is turned on (step S52), the flow returns to step 45 again, whereby the focus sweep operation and the detection of the FOK signal are performed again.

If the result of the FOK signal detection processing shown in step 46 is "yes", it is further determined whether FLG2 = 1 (step S5).
3). As a result, if "yes" is determined in the determination in step S53, the process proceeds to a disk determination process described in detail later (step S54).
On the other hand, if it is determined to be “no”, the DVD-RAM
Is determined (step S55), and the process ends.
Here, as described above, the determination step S
If "no" in 46, it is highly possible that the disc is a DVD-RAM, and as is clear from the above processing contents, FLG2 is set to 1 in step S51,
Also, since the FOK signal was obtained when switching to the DVD objective lens and the 650 nm laser for DVD, the probability of being a DVD-RAM is extremely high.
By using this flag FLG2, disc discrimination, in particular,
It is possible to determine the DVD-RAM.

Next, the details of the disc determination process will be described.
This will be described with reference to FIG. When the disc discrimination process is started (step S61), first, the spindle motor (see reference numeral 750 in FIG. 6) is rotated (step S62), and disc size is discriminated based on the rise time (step S63). That is, as is apparent from the graph shown in FIG. 10, the 12 cm DVD or CD optical disk having a large diameter is larger than the DVD-ROM or CD-ROM having a diameter of 8 cm when the spindle rises. Time is getting bigger. Therefore, utilizing this, for example, the spin-up speed is 8
It is determined whether the time is equal to or longer than 00 ms. As a result, it is possible to determine whether the diameter of the inserted optical disk is 8 cm or 12 cm. By temporarily storing the result, it can be used for a subsequent disk determination process.

Thereafter, initialization is performed (step S6).
4). In this initial setting, specifically, for example,
The I / V resistance value, the value of the sum signal for detecting the FOK signal (FOK signal detection level), and the like are set to predetermined values, or the flags FLG1, FLG used below are set.
2 is set to “0”.

Next, the focus lens 250 of the apparatus
Is switched to a CD objective lens, and a 780 nm laser for CD is turned on as a semiconductor laser as a light emitting source (step S65). Thereafter, the objective lens 25 is transmitted via the two-dimensional actuator control circuit 800 described above.
The focus sweep operation is performed by moving 0 in the vertical focus direction (more precisely, in the direction perpendicular to the information recording surface of the optical disk) (step S66). At this time, the amplitude of the FE signal is detected and stored (step S67), and thereafter, it is determined whether or not the FOK signal is detected (step S66). If it is determined as “no” in step S67, the gain is reset and FLG1 is set to 1 (step S67).
69), and return to step S66.

On the other hand, in step S69, "yes"
If "s" is determined, the focus lens 250 of the apparatus is switched to a DVD objective lens, and the semiconductor laser, which is a light emitting source, is switched to a 650 nm laser for DVD (step S70). After that,
The focus sweep operation (step S71) and the FE signal amplitude detection (step S72) described above are performed, and it is determined whether or not the FOK signal is detected (step S73).
This is the same as above.

Then, in the above step S73,
When it is determined to be “no”, it is determined whether or not FLG2 = 1 (step S74). When it is determined to be “no”, the gain is reset and FLG2 is set.
Is set to 1 (step S75), and the above-described step S7 is set.
Return to 1. If "yes" is determined in step S74, the process proceeds to step S86 described later.

On the other hand, in step S73, “y
es ", then the above step S
F detected by 780 nm laser light for CD at 67
E amplitude (FECD) and 65 for DVD in step S72
The amplitude of the FE detected by the 0 nm laser beam (FEDV
D) to determine whether or not FEDVD ≧ FECD (step S76).

Referring to the graph shown in FIG. 13, the FE amplitude obtained by the 780 nm laser light and the 650 nm laser light for each optical disk is shown. In particular, DVD-RAM, DVD -ROM, C
For D-ROM, DVD-RAM and DVD-RO
At M, the value of FEDVD is larger than the value of FECD, and therefore, it is determined to be "yes" here. On the other hand, CD-R
As for OM, the value of FECD is larger than the value of FEDVD, and is determined to be “no”.

Next, "yes" in step S76.
For the optical disc determined to be
It is determined whether G1 or FLG2 = 1 is satisfied (step S77). That is, as is clear from the characteristics shown in FIG.
As an optical disk in which LG1 = 1 is set, DV
This is because the possibility of a D-RAM is high, and an optical disk in which FLG2 = 1 is set has a high possibility of a DVD-ROM (two layers). Thereafter, the FE shown in FIG.
The signal amplitude ratio (focus error signal amplitude ratio) is determined, that is, the FE signal amplitude ratio (FEDVD / FECD) is
It is determined whether or not the value is equal to or more than a determination reference value (for example, 3) (step S34), and the optical disk determined to be “yes” is determined to be a DVD-RAM, and the process ends (step S80). On the other hand, the optical disk determined to be "no" is determined to be a DVD-ROM (two layers), and the process is also terminated (step S81).

Also, "no" is determined in step S77.
DVD-ROM (single layer)
And DVD-ROM (two layers), where
Further, the signal amplitude of the FEDVD is a predetermined value (for example,
It is determined whether or not the voltage exceeds 0.6 V (steps S83, S84). That is, as is clear from FIG. 13, the FEDVD value of the DVD-ROM (one layer) exceeds 0.6 V, while the FEDVD value of the DVD-ROM (one layer) is
Layer) does not reach this value. As a result, in the case of “yes”, it is determined that the DVD-ROM is a single layer (Step S).
85) In the case of “no”, it is determined that the DVD-ROM (two layers) (step S82), and the processing ends. The DVD-ROM (single layer) determination (step S
As for 85), as is clear from the figure, based on the result determined in step S63, it is possible to further determine the size of the diameter, 8 cm, and 12 cm.

Next, with respect to the optical disk determined to be "yes" in step S74 or "no" in step S76, the FECD
It is determined whether or not the signal amplitude exceeds a predetermined value (for example, 0.8 V) (steps S86 and S87).
That is, as is clear from FIG. 13, among CDs, the value of the FECD of the CD-RW is smaller than 0.8 V, but the value of the FECD of the other CD-ROM or CD-R is less than 0.8 V. Greater than 8V. As a result, the above step S8
If “yes” in step 7, the optical disc is
It is determined as D-RW (step S88). On the other hand, "n
If “o” is set, a determination regarding the FOK signal detection is further performed (step S89).

The FOK signal detection utilizes the contents determined and stored in step 73. This is especially true for CD-R and C
A very large difference is obtained from the D-ROM in the level of the sum signal obtained by the 650 nm laser beam for DVD. Therefore, using this, CD-R and CD
-Discriminating the ROM. That is, if “yes” is determined in step S89, the optical disc is determined to be a CD-ROM (step S90).
If "no", it is determined that the disc is a CD-R (step S91). As is clear from the figure, the determination of the CD-ROM (step S90) is also based on the result determined in step S63, and the size of the diameter, 8 cm, 12 cm
Is also determined.

As described above, according to the optical disk recording / reproducing apparatus, not only the DVD disk or CD but also the various types of optical disks inserted and mounted in the apparatus can be determined by the above-described optical disk determining method. Types, that is, CD-RW, CD-ROM and CD-R,
And DVD-RAM, DVD-ROM (single layer) DVD
-Discrimination of ROM (two layers) becomes possible. As a result, based on the discrimination result, the optical disc recording / reproducing apparatus performs various setting operations suitable for the type, thereby setting the optimum recording / reproducing conditions for the optical disc to be inserted, and more suitable information recording / reproducing. Enable operation.

FIG. 4 shows a modification in which a part of the processing flow shown in FIG. 3 is changed. In this modification, the phenomenon in which the zero crossing of the FE signal is detected twice is used particularly in the focus sweep operation of the DVD-ROM two-layer disc. here,
Explaining only the characteristic points, a step S720 for detecting the number of zero crosses of the FE signal is provided, and after the determination processing in step S76, a newly provided step S7 is performed.
In steps S21 to S723, the number of zero crossings (FZC) of the detected FE signal is confirmed. That is, if the number of zero crosses (FZC) is 2, it is determined that the DVD-ROM has two layers. In addition, the DVD disk determined to be “no” in step S722 further depends on whether the FLG1 is 1 or not.
It is determined to be the ROM 1 layer.

FIG. 5 shows another modification of the portion surrounded by the dashed line in the flow of the modification shown in FIG. That is, in this other modified example, as is apparent from FIG. 14, the DVD-ROM in the FE signal amplitude ratio (focus error signal amplitude ratio) is used.
Take advantage of significant differences between RAM and DVD-ROM. That is, it is determined whether the FE signal amplitude ratio is 3 or more (steps S751, 752).
In the case of "yes", the DVD-RAM and "n"
In the case of "o", it is determined that the DVD-ROM is a single layer.

[0060]

As is apparent from the above detailed description, according to the optical disk recording / reproducing apparatus and the optical disk discriminating method according to the present invention, a CD or a DV which is a high-density medium is used.
D, and various types of optical disks that have become widespread, it is possible to more accurately determine the type of the optical disk,
Thus, the setting operation of the optical disk recording / reproducing apparatus is ensured, and the recording / reproducing operation of information under the optimal recording / reproducing condition is enabled.

[Brief description of the drawings]

FIG. 1 is a schematic diagram of a flowchart illustrating an optical disk discriminating method implemented in an optical disk recording / reproducing apparatus according to an embodiment of the present invention.

FIG. 2 is a flowchart illustrating the details of a process for detecting the absence of a mis-chucking disk in the schematic flowchart of FIG. 1;

FIG. 3 is a flowchart illustrating details of a disc determination process in the schematic flowchart of FIG. 1;

FIG. 4 is a flowchart showing a modification of part of the flowchart of FIG. 3;

FIG. 5 is a flowchart showing a partial modification of the flowchart of FIG. 4;

FIG. 6 is a block diagram showing an overall configuration of a recording / reproducing apparatus for an optical information recording medium according to the present invention.

FIG. 7 is a diagram showing information reproduction / reproduction by the recording / reproduction device of the present invention.
FIG. 3 is a perspective view showing an appearance of an optical disc on which recording is performed.

FIG. 8 is a diagram showing an example of a switching mechanism between a CD objective lens and a DVD objective lens in the optical disk recording / reproducing apparatus.

FIG. 9 is a diagram showing a detailed circuit configuration including a signal processing section and its peripheral portion in the optical disc recording / reproducing apparatus according to the present invention.

FIG. 10 is a diagram showing a rise time characteristic, which is a characteristic of the various optical disks.

FIG. 11 shows a CD 780 in the above various optical disks.
It is a figure showing a sum signal by nm laser light.

FIG. 12 shows a DVD 65 for the above various optical disks.
It is a figure showing a sum signal by 0 nm laser light.

FIG. 13 shows a CD 780 in the above various optical disks.
FIG. 6 is a diagram showing a focus error signal amplitude by a nm laser beam and a 650 nm laser beam for DVD.

FIG. 14 shows a CD 780 in the above various optical disks.
FIG. 7 is a diagram showing a focus error signal amplitude ratio between a nm laser beam and a 650 nm laser beam for DVD.

FIG. 15 is a cross-sectional view showing a normal insertion state of the optical disc and mischucking in the recording / reproducing apparatus.

FIG. 16 shows a DVD-R used in a cartridge.
It is a perspective view showing AM and the tray of the above-mentioned recording and reproducing device.

[Explanation of symbols]

 REFERENCE SIGNS LIST 100 optical disk 200 optical reproducing means (optical pickup) 250 focus lens 300 signal processing unit 400 microcomputer 800 two-dimensional actuator control circuit

Claims (8)

[Claims] 1. An optical disk recording / reproducing apparatus capable of recording / reproducing recording information by at least two kinds of laser beams having different wavelengths, wherein the optical disk recording is performed based on an amount of reflection of the laser light on an inserted optical disk surface. Means for generating a sum signal and a focus error signal generated by the reproducing apparatus, further comprising detecting the generated sum signal and the focus error signal for each of the laser beams having different wavelengths. An optical disc recording / reproducing apparatus, comprising: means for judging the type of an optical disc inserted into the recording / reproducing apparatus based on the detected sum signal and the focus error signal of the laser beams having different wavelengths. . 2. The optical disk recording / reproducing apparatus according to claim 1, further comprising means for detecting mis-chucking of an optical disk inserted into said recording / reproducing apparatus. 3. The optical disk recording / reproducing apparatus according to claim 1, further comprising: determining a type of the optical disk inserted into the recording / reproducing apparatus based on the number of zero crossings of the obtained focus error signal. An optical disc recording / reproducing apparatus, comprising: means for determining. 4. A discriminating method for discriminating a type of an optical disc inserted into an optical disc recording / reproducing apparatus capable of performing recording / reproducing operation by using at least two kinds of laser beams having different wavelengths, the method comprising: A sum signal and a focus error signal generated by the optical disc recording / reproducing device based on the reflection amount are detected for each of the laser beams having different wavelengths, and the detected sum signal is generated by the detected laser beams having different wavelengths. An optical disc discriminating method for discriminating a type of an optical disc inserted into the recording / reproducing apparatus based on the focus error signal and the focus error signal. 5. The optical disc discriminating method according to claim 4, further comprising discriminating a type of the optical disc inserted into the recording / reproducing apparatus, based on a ratio of the focus error signals by the laser beams having different wavelengths. An optical disc discrimination method characterized by the above-mentioned. 6. A discriminating method for discriminating a type of an optical disc inserted into an optical disc recording / reproducing apparatus capable of performing recording / reproducing operation by at least two kinds of laser beams having different wavelengths, the method comprising: An optical disc discriminating method, comprising: discriminating a type of an optical disc inserted into the recording / reproducing apparatus based on a number of zero crossings of a focus error signal generated by the optical disc recording / reproducing apparatus based on a reflection amount. 7. A method for detecting mis-chucking of an optical disk inserted into an optical disk recording / reproducing apparatus capable of performing recording / reproducing operations with at least two types of laser beams having different wavelengths, the method comprising: A method for detecting mis-chucking of an optical disk, comprising: causing an optical head of the optical disk recording / reproducing apparatus to perform a focus sweep operation with respect to each of the laser beams; and determining a mis-chucking of the optical disk based on a result of the focus sweep operation. 8. The method for detecting mis-chucking of an optical disk according to claim 7, wherein the focus sweep operation is first performed by a laser beam having a longer wavelength among the plurality of types of laser beams, and thereafter, the focus sweep operation is performed by a laser beam having a shorter wavelength. A method for determining mis-chucking of an optical disk, wherein the focus sweep operation is performed by a laser beam.