JPH11306650A - Optical disk class discriminating device and optical disk class discriminating method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To discriminate the class of an optical disk in a short time and correctly by detecting reflected beams corresponding to light beams to be reflected from the optical disk. SOLUTION: This device discriminates the class of an optical disk based on a focus error signal and a tracking error signal which are obtained from a servo ampilier 43 and sum signals which are obtained from a reference amplifier 24. There are a focus sum signal and a tracking sum signal expressing the reflectivity of the optical disk in the sum signals, however, wherein, either the focus sum signal or the tracking sum signal is adopted as a sum signal. Then, a class of disk discriminating part 44 discriminates the class of the disk loaded on an optical disk device based on signal levels a first focus error signal, a first tracking error signal, a first sum signal, a second focus error signal, a second tracking error signal and a second sum signal which are stored in a RAM 53.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a DVD-RA
The present invention relates to an optical disc type discriminating apparatus and disc type discriminating method for discriminating various optical disc types such as M, DVD-ROM, and CD-ROM.

[0002]

2. Description of the Related Art In recent years, various types of optical disks have appeared, and in the future, various types of disks may be developed and appeared. For example, optical disks include DVD-type optical disks characterized by high-density recording and CD-type optical disks that have already become widespread. DVD-R includes DVD-R
AM and DVD-ROM. CD-system includes CD-
ROM, CD-R, CD-RW and the like.

An optical disk device capable of processing a DVD optical disk is required to reproduce not only a DVD disk but also a CD disk. There have been various proposals for such a compatible optical disk device, and the development thereof has been promoted. Further, in such a compatible optical disk device, it is necessary to determine the type of the loaded optical disk, and various types of optical disk type determination methods have been proposed. For example, there is a method of playing back an optical disk and determining the type of the optical disk based on data recorded on the optical disk.

[0004]

However, the above-mentioned conventional optical disk type discrimination method requires reproduction of an optical disk, and therefore, it is necessary to execute a plurality of reproduction methods corresponding to various disks. As a result, the type of the optical disc cannot be determined in a short time.

An object of the present invention has been made in view of the above circumstances, and provides an optical disc type discriminating apparatus and an optical disc type discriminating method capable of discriminating the type of an optical disc quickly and accurately. Is to do.

[0006]

In order to solve the above problems and achieve the object, an optical disk type determining apparatus and an optical disk type determining method according to the present invention are configured as follows.

An optical disk type discriminating apparatus according to the present invention comprises: a light condensing means for converging a light beam on a predetermined optical disk; Moving means for moving the light condensing means along an axial direction, and detection for detecting a reflected beam corresponding to the light beam reflected from the predetermined optical disk with the movement of the light condensing means by the moving means Means for determining the type of the predetermined optical disc based on the detection result of the detection means.

[0008] An optical disk type discriminating apparatus according to the present invention comprises: a condensing means for condensing a light beam on a predetermined optical disk; Detecting means for detecting a reflected beam corresponding to the light beam reflected from the predetermined optical disk as the light condensing means moves by the moving means; and detecting the predetermined optical disk based on a detection result of the detecting means. And a determination unit for determining the type.

An optical disk type discriminating apparatus according to the present invention comprises: a light condensing means for converging a light beam on a predetermined optical disk; First moving means for moving the light collecting means along an axial direction, and second moving means for moving the light collecting means along a radial direction of the predetermined optical disc.
Moving means, detecting means for detecting a reflected beam corresponding to the light beam reflected from the predetermined optical disk with movement of the light condensing means by the first and second moving means, and detecting the detecting means Determining means for determining the type of the predetermined optical disk based on the result.

An optical disc type discriminating apparatus according to the present invention comprises a first emitting means for emitting a first light beam of a first wavelength, and a second emitting means for emitting a second light beam of a second wavelength different from the first wavelength. A first light beam for focusing the first light beam emitted from the first emitting means on a predetermined optical disc.
A first condensing means having a numerical aperture, and a second condensing means having a second numerical aperture different from the first numerical aperture for condensing the second light beam emitted from the second emitting means on the predetermined optical disc. Light means, first moving means for moving the first light condensing means along an optical axis direction of a first condensed beam condensed on the predetermined optical disc by the first light condensing means, A second moving means for moving the first condensing means along a radial direction of the predetermined optical disc; and a second condensing beam condensed on the predetermined optical disc by the second condensing means. A third moving means for moving the second condensing means along the optical axis direction, a fourth moving means for moving the second condensing means along a radial direction of the predetermined optical disc, With the movement of the first light condensing means by the first and second moving means, A first detecting means for detecting a first reflected beam corresponding to the first condensed beam reflected from a predetermined optical disc, and the third and fourth moving means moving the second condensing means, A second detection unit for detecting a second reflected beam corresponding to the second condensed beam reflected from the predetermined optical disk; and a type of the predetermined optical disk based on detection results of the first and second detection units. Determining means for determining.

An optical disc type discriminating apparatus according to the present invention comprises a first emitting means for emitting a first light beam having a first wavelength, and a second emitting means for emitting a second light beam having a second wavelength different from the first wavelength. A first light beam for focusing the first light beam emitted from the first emitting means on a predetermined optical disc.
A first condensing means having a numerical aperture, and a second condensing means having a second numerical aperture different from the first numerical aperture for condensing the second light beam emitted from the second emitting means on the predetermined optical disc. Light means, first moving means for moving the first light condensing means along an optical axis direction of a first condensed beam condensed on the predetermined optical disc by the first light condensing means, A second moving means for moving the first condensing means along a radial direction of the predetermined optical disc; and a second condensing beam condensed on the predetermined optical disc by the second condensing means. A third moving means for moving the second condensing means along the optical axis direction, a fourth moving means for moving the second condensing means along a radial direction of the predetermined optical disc, With the movement of the first light condensing means by the first and second moving means, A first detecting means for detecting a first reflected beam corresponding to the first condensed beam reflected from a predetermined optical disc, and the third and fourth moving means moving the second condensing means, A second detecting means for detecting a second reflected beam corresponding to the second condensed beam reflected from the predetermined optical disc; and a first collecting means for detecting the first reflected beam based on the first reflected beam detected by the first detecting means. A first output unit that outputs a first focus error signal corresponding to a focus state of the first condensed beam collected by the optical unit, and the first reflected beam detected by the first detection unit. A second output unit for outputting a first tracking error signal corresponding to a tracking state of the first condensed beam condensed by the first condensing unit; Third output means for outputting a first sum signal corresponding to the reflectance of the predetermined optical disk based on the first reflected beam, and the second reflected beam detected by the second detection means. Fourth output means for outputting a second focus error signal corresponding to a focus state of the second condensed beam collected by the second condensing means, and the second reflected beam detected by the second detection means A fifth output means for outputting a second tracking error signal corresponding to a tracking state of the second condensed beam condensed by the second condensing means, and Sixth output means for outputting a second sum signal corresponding to the reflectance of the predetermined optical disk based on the second reflected beam; and the first, second, third, fourth, fifth and sixth outputs Means Discriminating means for discriminating the type of the predetermined optical disk based on each signal output from the optical disk.

An optical disc type discriminating apparatus according to the present invention comprises: a first emitting means for emitting a first light beam having a first wavelength; and a second emitting means for emitting a second light beam having a second wavelength different from the first wavelength. A first light beam for focusing the first light beam emitted from the first emitting means on a predetermined optical disc.
A first condensing means having a numerical aperture, and a second condensing means having a second numerical aperture different from the first numerical aperture for condensing the second light beam emitted from the second emitting means on the predetermined optical disc. Light means, first moving means for moving the first light condensing means along an optical axis direction of a first condensed beam condensed on the predetermined optical disc by the first light condensing means, A second moving means for moving the first condensing means along a radial direction of the predetermined optical disc; and a second condensing beam condensed on the predetermined optical disc by the second condensing means. A third moving means for moving the second condensing means along the optical axis direction, a fourth moving means for moving the second condensing means along a radial direction of the predetermined optical disc, With the movement of the first light condensing means by the first and second moving means, A first detecting means for detecting a first reflected beam corresponding to the first condensed beam reflected from a predetermined optical disc, and the third and fourth moving means moving the second condensing means, A second detecting means for detecting a second reflected beam corresponding to the second condensed beam reflected from the predetermined optical disc; and a first collecting means for detecting the first reflected beam based on the first reflected beam detected by the first detecting means. A first output unit that outputs a first focus error signal corresponding to a focus state of the first condensed beam collected by the optical unit, and the first reflected beam detected by the first detection unit. A second output unit for outputting a first tracking error signal corresponding to a tracking state of the first condensed beam condensed by the first condensing unit; Third output means for outputting a first sum signal corresponding to the reflectance of the predetermined optical disk based on the first reflected beam, and the second reflected beam detected by the second detection means. Fourth output means for outputting a second focus error signal corresponding to a focus state of the second condensed beam collected by the second condensing means, and the second reflected beam detected by the second detection means A fifth output means for outputting a second tracking error signal corresponding to a tracking state of the second condensed beam condensed by the second condensing means, and Sixth output means for outputting a second sum signal corresponding to the reflectance of the predetermined optical disk based on the second reflected beam; and a first focus error signal and a first focus error signal for each type of the optical disk.
Storage means for storing a signal level table indicating signal levels of a tracking error signal, a first sum signal, a second focus error signal, a second tracking error signal, and a second sum signal; Referring to the signal level table, the type of the predetermined optical disc is determined based on the signal level of each signal output from the first, second, third, fourth, fifth, and sixth output means. Determining means for performing the determination.

[0013] The optical disc type discriminating apparatus of the present invention comprises a first emitting means for emitting a first light beam of a first wavelength, and a second emitting means for emitting a second light beam of a second wavelength different from the first wavelength. A first light beam for focusing the first light beam emitted from the first emitting means on a predetermined optical disc.
A first condensing means having a numerical aperture, and a second condensing means having a second numerical aperture different from the first numerical aperture for condensing the second light beam emitted from the second emitting means on the predetermined optical disc. Light means, first moving means for moving the first light condensing means along an optical axis direction of a first condensed beam condensed on the predetermined optical disc by the first light condensing means, A second moving means for moving the first condensing means along a radial direction of the predetermined optical disc; and a second condensing beam condensed on the predetermined optical disc by the second condensing means. A third moving means for moving the second condensing means along the optical axis direction, a fourth moving means for moving the second condensing means along a radial direction of the predetermined optical disc, With the movement of the first light condensing means by the first and second moving means, A first detecting means for detecting a first reflected beam corresponding to the first condensed beam reflected from a predetermined optical disc, and the third and fourth moving means moving the second condensing means, A second detecting means for detecting a second reflected beam corresponding to the second condensed beam reflected from the predetermined optical disc; and a first collecting means for detecting the first reflected beam based on the first reflected beam detected by the first detecting means. A first output unit that outputs a first focus error signal corresponding to a focus state of the first condensed beam collected by the optical unit, and the first reflected beam detected by the first detection unit. A second output unit for outputting a first tracking error signal corresponding to a tracking state of the first condensed beam condensed by the first condensing unit; Third output means for outputting a first sum signal corresponding to the reflectance of the predetermined optical disk based on the first reflected beam, and the second reflected beam detected by the second detection means. Fourth output means for outputting a second focus error signal corresponding to a focus state of the second condensed beam collected by the second condensing means, and the second reflected beam detected by the second detection means A fifth output means for outputting a second tracking error signal corresponding to a tracking state of the second condensed beam condensed by the second condensing means, and Sixth output means for outputting a second sum signal corresponding to the reflectance of the predetermined optical disk based on the second reflected beam; and a first focus error signal and a first focus error signal for each type of the optical disk.
A storage unit for storing a signal level table indicating a signal level range of the tracking error signal, the first sum signal, the second focus error signal, the second tracking error signal, and the second sum signal; The signal level of each of the signals output from the first, second, third, fourth, fifth, and sixth output means with reference to the signal level table. Determining means for calculating the degree of approximation and discriminating the type of the predetermined optical disc based on the calculation result of the degree of approximation;

[0014] The optical disc type discriminating method according to the present invention includes a first step of converging a light beam on a predetermined optical disc by a condensing means; Along with the optical axis direction of the light beam, along with a moving process for moving the light collecting means,
A second step of detecting a reflected beam corresponding to the light beam reflected from the predetermined optical disc;
A third step of determining the type of the predetermined optical disk based on the detection result of the step. An optical disc type discrimination method according to the present invention includes a first step of converging a light beam on a predetermined optical disc by a condensing means, and a moving process of moving the condensing means along a radial direction of the predetermined optical disc. Accordingly, a second step of detecting a reflected beam corresponding to the light beam reflected from the predetermined optical disk, and a third step of determining a type of the predetermined optical disk based on a detection result of the second step It has.

The method for discriminating an optical disk type according to the present invention includes a first step of converging a light beam on a predetermined optical disk by a condensing means; Along with the moving process of moving the light condensing means along the optical axis direction of the light beam and the moving process of moving the light condensing means along the radial direction of the predetermined optical disc, the light is reflected from the predetermined optical disc. A second step of detecting a reflected beam corresponding to the light beam to be performed, and a third step of determining a type of the predetermined optical disk based on a detection result of the second step.

In the optical disc type determining method according to the present invention, the first light beam of the first wavelength emitted by the first emitting means is focused on a predetermined optical disc by the first focusing means of the first numerical aperture. A first step, a moving process of moving the first light condensing means along an optical axis direction of a first condensed beam condensed on the predetermined optical disk by the first light condensing means, and A second process for detecting a first reflected beam corresponding to the first condensed beam reflected from the predetermined optical disc along with a moving process of moving the first condensing means along a radial direction of the predetermined optical disc. And step, the second light beam of the second wavelength different from the first wavelength emitted by the second emitting means is applied to the predetermined optical disc by the second condensing means of the second numerical aperture different from the first numerical aperture. Focus on A third step, the second to be condensed to the given optical disc by said second condensing means
Along with a moving process of moving the second condensing unit along the optical axis direction of the condensed beam, and a moving process of moving the second condensing unit along a radial direction of the predetermined optical disc, A fourth step of detecting a second reflected beam corresponding to the second condensed beam reflected from the predetermined optical disc; and determining a type of the predetermined optical disc based on the detection results of the second and fourth steps. And a fifth step.

According to the optical disc type discrimination method of the present invention, the first light beam of the first wavelength emitted by the first emitting means is focused on a predetermined optical disc by the first focusing means of the first numerical aperture. A first step, a moving process of moving the first light condensing means along an optical axis direction of a first condensed beam condensed on the predetermined optical disk by the first light condensing means, and A second process for detecting a first reflected beam corresponding to the first condensed beam reflected from the predetermined optical disc along with a moving process of moving the first condensing means along a radial direction of the predetermined optical disc. And a first focus error signal corresponding to a focus state of the first condensed beam collected by the first condensing means based on the first reflected beam detected in the second step. Output processing for outputting a first tracking error signal corresponding to the tracking state of the first condensed beam condensed by the first condensing means, and outputting the first tracking error signal corresponding to the reflectance of the predetermined optical disc. A third step of executing an output process of outputting a 1-sum signal, and a second light beam having a second wavelength different from the first wavelength and emitted by a second emitting means, the second light beam having a second wavelength different from the first numerical aperture. A fourth step of converging the predetermined optical disc by the second condensing means with a numerical aperture, and an optical axis of a second condensed beam condensed on the predetermined optical disc by the second condensing means Along with a moving process of moving the second condensing unit along a direction, and a moving process of moving the second condensing unit along a radial direction of the predetermined optical disc, the light reflected from the predetermined optical disc is A fifth step of detecting a second reflected beam corresponding to the second focused beam, and based on the second reflected beam detected in the fifth step, Output processing for outputting a second focus error signal corresponding to the focus state of the second condensed beam, a second tracking error signal corresponding to the tracking state of the second condensed beam collected by the second condensing means A sixth step of executing an output process of outputting a second sum signal corresponding to the reflectance of the predetermined optical disc, and a signal output by the third and fifth steps. A seventh step of determining a type of the predetermined optical disc;
And steps.

According to the optical disc type discrimination method of the present invention, the first light beam of the first wavelength emitted by the first emitting means is focused on a predetermined optical disc by the first focusing means of the first numerical aperture. A first step, a moving process of moving the first light condensing means along an optical axis direction of a first condensed beam condensed on the predetermined optical disk by the first light condensing means, and A second process for detecting a first reflected beam corresponding to the first condensed beam reflected from the predetermined optical disc along with a moving process of moving the first condensing means along a radial direction of the predetermined optical disc. And a first focus error signal corresponding to a focus state of the first condensed beam collected by the first condensing means based on the first reflected beam detected in the second step. Output processing for outputting a first tracking error signal corresponding to the tracking state of the first condensed beam condensed by the first condensing means, and outputting the first tracking error signal corresponding to the reflectance of the predetermined optical disc. A third step of executing an output process of outputting a 1-sum signal, and a second light beam having a second wavelength different from the first wavelength and emitted by a second emitting means, the second light beam having a second wavelength different from the first numerical aperture. A fourth step of converging the predetermined optical disc by the second condensing means with a numerical aperture, and an optical axis of a second condensed beam condensed on the predetermined optical disc by the second condensing means Along with a moving process of moving the second condensing unit along a direction, and a moving process of moving the second condensing unit along a radial direction of the predetermined optical disc, the light reflected from the predetermined optical disc is A fifth step of detecting a second reflected beam corresponding to the second focused beam, and based on the second reflected beam detected in the fifth step, Output processing for outputting a second focus error signal corresponding to the focus state of the second condensed beam, a second tracking error signal corresponding to the tracking state of the second condensed beam collected by the second condensing means And a sixth step of executing an output process of outputting a second sum signal corresponding to the reflectance of the predetermined optical disc, and a first focus error signal and a first tracking error for each type of optical disc. A signal level table showing signal levels of the signal, the first sum signal, the second focus error signal, the second tracking error signal, and the second sum signal is shown in FIG. And a seventh step of determining the type of the predetermined optical disk based on the signal level of each signal output in the third and sixth steps.

According to the optical disc type discrimination method of the present invention, the first light beam of the first wavelength emitted by the first emitting means is focused on a predetermined optical disc by the first focusing means of the first numerical aperture. A first step, a moving process of moving the first light condensing means along an optical axis direction of a first condensed beam condensed on the predetermined optical disk by the first light condensing means, and A second process for detecting a first reflected beam corresponding to the first condensed beam reflected from the predetermined optical disc along with a moving process of moving the first condensing means along a radial direction of the predetermined optical disc. And a first focus error signal corresponding to a focus state of the first condensed beam collected by the first condensing means based on the first reflected beam detected in the second step. Output processing for outputting a first tracking error signal corresponding to the tracking state of the first condensed beam condensed by the first condensing means, and outputting the first tracking error signal corresponding to the reflectance of the predetermined optical disc. A third step of executing an output process of outputting a 1-sum signal, and a second light beam having a second wavelength different from the first wavelength and emitted by a second emitting means, the second light beam having a second wavelength different from the first numerical aperture. A fourth step of converging the predetermined optical disc by the second condensing means with a numerical aperture, and an optical axis of a second condensed beam condensed on the predetermined optical disc by the second condensing means Along with a moving process of moving the second condensing unit along a direction, and a moving process of moving the second condensing unit along a radial direction of the predetermined optical disc, the light reflected from the predetermined optical disc is A fifth step of detecting a second reflected beam corresponding to the second focused beam, and based on the second reflected beam detected in the fifth step, Output processing for outputting a second focus error signal corresponding to the focus state of the second condensed beam, a second tracking error signal corresponding to the tracking state of the second condensed beam collected by the second condensing means And a sixth step of executing an output process of outputting a second sum signal corresponding to the reflectance of the predetermined optical disc, and a first focus error signal and a first tracking error for each type of optical disc. Signal, a first sum signal, a second focus error signal, a second tracking error signal, and a signal level table indicating a signal level range of the second sum signal. With reference to the table, the signal level of each signal output in the third and sixth steps is calculated to determine the degree of approximation to which type of optical disc is close, and based on the calculation result of the degree of approximation, the predetermined level is used. Seventh discrimination of optical disc type
And steps.

[0020]

Embodiments of the present invention will be described below with reference to the drawings.

First, the types of optical disks will be briefly described. The optical disk has a D
There are a VD type and a CD type which has already spread. DVD systems include DVD-RAM, DVD-ROM,
There are DVD-Video and DVD-R. CDs include music CDs, CD-ROMs, CD-Rs, and CD-RWs.
and so on. Hereinafter, DVD is simply referred to as DVD-RA
M, DVD-ROM, DVD-Video, DVD-R
, Simply speaking CD, music CD, CD-RO
M, CD-R, CD-RW.

First, the schematic structure of a DVD optical disk will be described with reference to FIG.

As shown in FIG. 1, the DVD-type optical disk 10 has a structure in which a pair of transparent substrates 14 each having a recording layer 17 provided thereon are bonded with an adhesive layer 20. Each substrate 14 can be made of 0.6 mm thick polycarbonate, and the adhesive layer 20 can be made of an extremely thin (for example, 40 μm thick) ultraviolet curable resin. The pair of 0.6 mm substrates 14 are attached to each other such that the recording layer 17 is in contact with the surface of the adhesive layer 20 so as to be 1.2.
An optical disk 10 having a thickness of mm is obtained.

The optical disc 10 is provided with a center hole 22. Around the center hole 22 on both sides of the disc, a clamp area 24 for clamping the optical disc 10 at the time of rotational driving is provided. The spindle of the disk motor is inserted into the center hole 22 when the optical disk 10 is loaded in a disk drive device (not shown). Then, the optical disk 10 has its clamp area 2
At 4, the disk is clamped by a disk clamper (not shown) while the disk is rotating.

The optical disk 10 has an information area 25 around which the video data, audio data and other information can be recorded, around the clamp area 24.

In the information area 25, a lead-out area 26 is provided on the outer peripheral side. Further, a lead-in area 27 is provided on the inner peripheral side in contact with the clamp area 24.
Is provided. A data recording area 28 is defined between the lead-out area 26 and the lead-in area 27.

Recording layer (light reflection layer) 17 in information area 25
, Recording tracks are formed continuously in a spiral shape, for example. The continuous track is divided into a plurality of physical sectors, and these sectors are assigned serial numbers. Various data are recorded on the optical disk 10 using this sector as a recording unit.

The data recording area 28 is an actual data recording area. As recording / reproducing information, video data (main video data) such as a movie, sub-video data such as subtitles / menus, dialogue / sound effects, etc. Is recorded as a similar pit string (a physical shape or phase state that causes an optical change to the laser reflected light).

The optical disk 10 has a single-sided, single-layer, double-sided
In the case of a VD-RAM, each recording layer 17 can be constituted by a triple layer in which a phase change recording material layer (eg, Ge2Sb2Te5) is sandwiched between two zinc sulfide / silicon oxide mixtures (ZnS / SiO2).

The optical disc 10 has a single-sided, single-layer, single-sided recording D
In the case of a VD-RAM, the recording layer 17 on the read surface 19 side
Can be constituted by a triple layer including the phase change recording material layer. In this case, the layer 17 disposed on the opposite side as viewed from the reading surface 19 does not need to be an information recording layer, but may be a simple dummy layer.

When the optical disc 10 is a single-sided read-type two-layer DVD-RAM / DVD-ROM, the two recording layers 17 include one phase-change recording layer (the back side when viewed from the reading surface 19; for reading and writing). It can be composed of one translucent metal reflective layer (on the front side as viewed from the readout surface 19; reproduction only).

When the optical disk 10 is a DVD-R, polycarbonate is used as a substrate, gold is used as a reflection film (not shown), and an ultraviolet curing resin is used as a protection film (not shown). In this case, an organic dye is used for the recording layer 17. The organic dyes include cyanine, squarylium, croconic, triphenylmenthane dyes, xanthene, and quinone dyes (naphthoquin,
Anthraquinone, etc.), metal complex dyes (phthalocyanine,
Porphyrin, dithiol complexes, etc.) and others are available.

Data writing to such a DVD-R can be performed, for example, using a semiconductor laser having a wavelength of 650 nm and an output of about 6 to 12 mW.

When the optical disc 10 is a single-sided read-type two-layer DVD-ROM, the two recording layers 17 are composed of one metal reflection layer (the back side as viewed from the reading surface 19) and one translucent metal reflection layer ( (On the front side as viewed from the readout surface 19).

The optical disk 10 is a read-only DVD-
In the case of a ROM, a pit row is formed in advance on the substrate 14 by a stamper, and a reflective layer of metal or the like is formed on the surface of the substrate 14 on which the pit row is formed, and this reflective layer is used as the recording layer 17. become. Such DVD-ROM
In this case, usually, no groove is provided as a recording track, and a pit row formed on the surface of the substrate 14 functions as a track.

In the various DVD-type optical discs 10, the read-only ROM information is recorded on the recording layer 17 as an emboss signal. On the other hand, such an emboss signal is not formed on the substrate 14 having the recording layer 17 for reading and writing (or for writing once), but a continuous groove is formed instead. In this groove,
A phase change recording layer is provided. DVD-
In the case of a RAM, a phase-change recording layer on a land portion in addition to the groove is also used for information recording.

When the optical disk 10 is a single-sided reading type (single or two recording layers), the substrate 14 on the back side as viewed from the reading surface 19 does not need to be transparent to the reading / writing laser. In this case, a label may be printed on the entire surface of the back substrate 14.

Next, with reference to FIG. 2, an outline of an optical disc apparatus according to an embodiment of the disc type discriminating apparatus of the present invention will be described. The optical disk device shown in FIG.
In addition to the recording / reproducing process for D-RAM, DVD-RO
M, DVD-Video, DVD-R, music CD, C
Reproduction processing for a D-ROM, a CD-R, and a CD-RW can be performed.

This optical disk apparatus performs recording / reproduction on a DVD-RAM, DVD-ROM, DVD-Video
o, DVD-R, music CD, CD-ROM, CD-
R, CD-RW
A system optical system and a signal processing system are provided. In other words, this optical disk device has a DVD optical system and a signal processing system,
And a CD optical system and a signal processing system.

As shown in FIG. 2, the optical disk device is provided with a spindle motor 12, and the optical disk 10 is driven to rotate by the spindle motor 12.

As shown in FIG. 2, the optical disk device is provided with an objective lens actuator 70 and an optical pickup 32. Optical pickup 32
Irradiates the optical disk 10 with a light beam and detects reflected light from the optical disk. The light beam emitted from the optical pickup 32 is focused on the optical disc 10 via the objective lens actuator 70. That is, the reflected light of the collected light beam is detected by the optical pickup 32.

Here, the objective lens actuator 70 and its guide mechanism will be described with reference to FIGS.

The spindle motor 12 is fixed to a base 71 as shown in FIG. A pair of guide rails 73 arranged parallel to the radial direction is fixed to the base 71 below the optical disk 10. A carriage 72 running on the guide rail 73 is mounted on the guide rail 73, and an objective lens actuator 70 is provided on the carriage 72.

As shown in FIG. 4, the objective lens actuator 70 includes a lens holder 75 capable of floating and rotation and a lens holder support 7 in which the lens holder 75 is received.
And 4. An actuator base 76 fixed to the carriage 72 and having an opening 78 for a laser beam optical path is provided on the lens holder support 74, and a shaft 77 is fixed to the center of the actuator base 76. I have. An arc-shaped yoke 79 is fixed to the actuator base 76 along the circumference around the axis 77 of the support 74.

As shown in FIG. 5, the arc-shaped yoke 79 has a pair of opposing sets magnetized in the same magnetizing direction.
A pair of arc-shaped permanent magnets 81 and 82 are symmetrically arranged around the axis 7. This one set of permanent magnets 81
, And the other set of permanent magnets 82 is magnetized along the arc of the arc-shaped yoke 79.

The lens holder 75 is formed in a substantially cylindrical shape as shown in FIG.
A first objective lens 34 for D and a second objective lens 35 for CD having a small numerical aperture are provided. A cavity is provided below the first objective lens 34 and the second objective lens 35 so that a laser beam can pass therethrough. The first objective lens 34 and the second objective lens 35 are fixed to the lens holder 75 such that their optical axes are arranged on the same circumference around the center of the lens holder 75. Also,
A bearing 83 through which a shaft 77 is inserted is fixed to the center of the lens holder 75, and the lens holder 75 is rotatably and vertically movable by the bearing 83.
Supported by A magnetic body 84 is embedded around the lens holder 75 so as to be symmetrical with respect to the axis 77, and four magnetic coils similarly arranged symmetrically with respect to the axis 77 are provided on the magnetic body 84. 85 and 86 are fixed.

Next, the optical pickup 32 will be described with reference to FIG.

As shown in FIG. 7, the optical pickup 32
Are the first semiconductor laser 98 for DVD and the second semiconductor laser 98 for CD.
A semiconductor laser 99 is provided. First semiconductor laser 98
Generates a laser beam having a wavelength of 650 nm, for example. The second semiconductor laser 99 is, for example, 780n
A laser beam having a wavelength of m is generated.

The optical pickup 32 is housed and fixed in the internal space of a carriage 72 as a movable body.
The laser beam emitted from the first semiconductor laser 98 is
The light is collimated by the collimator lens 96, is reflected by the beam splitter 95, passes through the beam splitter 93, and is guided to the outside of the optical pickup 32. On the other hand, the laser beam emitted from the second semiconductor laser 99 is collimated by the collimator lens 97, passes through the beam splitters 95 and 93, and is guided to the outside of the optical pickup 32.

The laser beam guided from the optical pickup 32 is supplied to a first objective lens 34 and a second objective lens 3.
5, and the laser beam is focused on the recording track of the optical disk 10 by the first objective lens 34 or the second objective lens 35. The laser beam reflected from the optical disk 10 is returned to the optical pickup 32 via one of the first objective lens 34 and the second objective lens 35 again.

In the optical pickup 32, the laser beam is reflected by the beam splitter 93 and is condensed by a condenser lens 91.
, And are divided into two systems by a beam splitter 90, and detected by a first photodetector 94a for DVD and a second photodetector 94b for CD. And
A DVD-based focus error signal, tracking error signal, reproduction signal (sum signal), and the like are generated by a signal output from the first photodetector 94a. On the other hand, a signal output from the second photodetector 94b generates a focus error signal, a tracking error signal, a reproduction signal (sum signal), and the like of the CD system.

By using the above-mentioned focus error signal, a positional shift in the focus direction of the first objective lens 34 or the second objective lens 35 is detected, and the coils 85 and 86 are corrected as described later so as to correct the positional shift. Is supplied with current. Further, a position error in the track direction of the first objective lens 34 or the second objective lens 35 is detected by using the track error signal, and a current is supplied to the other of the coils 85 and 86 by correcting the position error. . In this way, information is recorded on the recording track of the optical disk 10, and the information is read from the recording track of the optical disk 10.

Here, returning to FIG. 2, the brief description of the optical disk apparatus will be resumed.

The optical disk device includes a CPU 55 and a ROM
54 and a RAM 53 are provided. CPU 55
Controls each unit of the optical disk device based on the control program stored in the ROM 54. Further, necessary data is temporarily stored in the RAM 53.

Further, the optical disk device is provided with a laser control section 40 for controlling the driving of the first semiconductor laser 98 and the second semiconductor laser 99. This laser controller 4
0 is a DVD mode based on an instruction from the CPU 55,
In the CD mode and the disc type determination mode, the driving of the first semiconductor laser 98 and the second semiconductor laser 99 is controlled. The DVD mode is a mode for executing data processing (recording, reproducing, erasing) on a DVD. The CD mode is a mode for executing data processing (reproduction) for a CD. The disc type discrimination mode is a mode for discriminating the type of the optical disc 10 loaded in the optical disc device. The disc type discrimination mode will be described later in detail.

The DVD mode described above includes a DVD-RA
Recording mode for recording data on M, DVD-RA
An erasing mode for erasing data recorded on M and a reproducing mode for reproducing data recorded on various DVDs are included. When the DVD mode is executed in the laser control unit 40, the first semiconductor laser 98 is driven.
At this time, the laser power emitted from the first semiconductor laser 98 is controlled to a laser power suitable for each of the recording mode, the erasing mode, and the reproducing mode. In the recording mode, the driving of the first semiconductor laser 98 is controlled based on the recording data output from the DVD data processing unit. As a result, the DVD-
Recording data output from the DVD data processing unit is recorded in the RAM.

The CD mode includes a reproduction mode for reproducing data recorded on various CDs. When the laser control unit 40 executes the CD mode, the second semiconductor laser 99 is driven. At this time, the laser power emitted from the second semiconductor laser 98 is controlled to a laser power suitable for the reproduction mode.

In the optical disk device, the optical disk is directly
Alternatively, a tray 62 for mounting an optical disk stored in the disk cartridge 11 is provided. The tray 62 includes a first objective lens 34 and a second objective lens 35.
The loaded optical disk 10 is conveyed into the optical disk device so that the optical disk 10 is arranged facing the optical disk.

Further, the optical disk device is provided with a tray motor 60 for driving the tray 62. The optical disk 10 loaded in the optical disk device has a stamper 6
3 and is rotatably held on a spindle motor 61 by the spindle motor 61. The optical pickup 32 is mounted on a feed mechanism (not shown) driven by a feed motor 56, and is moved in the radial direction of the optical disk 10 by the feed mechanism.

The signals (current signals) output from the first photodetector 94a and the second photodetector 94b provided in the optical pickup 32 are output from the current / voltage converter 4
1 converts it into a voltage signal. The converted voltage signal is supplied to the reference amplifier 42 and the servo amplifier 43.

The reference amplifier 42 outputs a reproduced signal as a sum signal (focus sum signal or tracking sum signal). DV in the laser control unit 40
When the D mode is executed, the output from the reference amplifier 42 is supplied to the DVD data processing unit 46. When the CD mode is executed in the laser control unit 40, the output from the reference amplifier 42 is C
It is supplied to the D servo seek control unit and the CD data processing unit 49. When the disc type discrimination mode is executed in the laser control unit 40, the reference amplifier 42
Is supplied to the disc type discriminating section 44.

The servo amplifier 43 generates a focus error signal and a tracking error signal based on the voltage signal converted by the current / voltage converter 41. The focus error signal is a signal corresponding to the focus state of the light beam emitted from the first semiconductor laser 98 or the second semiconductor laser 99. The tracking error signal is the first
It is a signal corresponding to the tracking state of the light beam emitted from the semiconductor laser 98 or the second semiconductor laser 99. That is, the servo amplifier 43 outputs a focus error signal and a tracking error signal. When the DVD mode is executed in the laser control unit 40, the output from the servo amplifier 43 is
It is supplied to the servo seek control unit 48. Laser controller 4
0, when the CD mode is executed, the servo
The output from the amplifier 43 is supplied to a CD servo seek control unit and a CD data processing unit 49. Laser controller 40
In the case where the disc type discrimination mode is executed in, the output from the servo amplifier 43 is supplied to the disc type discrimination unit 44.

The DVD servo seek controller 48 generates a focus signal and a tracking signal for controlling the focus / tracking actuator driver and the feed motor driver 57 based on the focus error signal and the tracking error signal supplied from the servo amplifier 43. Generate. Further, a DVD servo seek control unit 4
8 generates an access signal based on a disk access instruction supplied from the CPU 55. The focus signal, the tracking signal, and the access signal generated by the DVD servo seek control unit 48 correspond to the focus / tracking actuator driver and the feed motor driver 5.
7. The focus / tracking actuator driver and the feed motor driver 57 perform focus servo control and tracking servo control of the first objective lens 34 based on the focus signal and the tracking signal supplied from the DVD servo seek control unit 48.
Further, the focus / tracking actuator driver and the feed motor driver 57 control the drive of the feed motor 56 based on the access signal supplied from the DVD servo seek control unit 48.

The CD servo seek control section and the CD data processing section 49 perform the following based on the focus error signal and the tracking error signal supplied from the servo amplifier 43.
A focus signal and a tracking signal for controlling the focus / tracking actuator driver and the feed motor driver 57 are generated. Further, the CD servo seek control unit and the CD data processing unit 49
An access signal is generated based on the disk access instruction supplied from the control unit 5. CD servo seek control unit and C
The focus signal, tracking signal, and access signal generated by the D data processing unit 49 are supplied to a focus / tracking actuator driver and a feed motor driver 57. The focus / tracking actuator driver and the feed motor driver 57 are a CD
Based on the focus signal and tracking signal supplied from the servo seek control unit and the CD data processing unit 49,
Focus servo control and tracking servo control of the second objective lens 34 are performed. Further, a focus / tracking actuator driver and a feed motor driver 5
7 is a CD servo seek control unit and a CD data processing unit 4
9 based on the access signal supplied from the feed motor 5.
6 is controlled.

The spindle motor 61 is controlled by a spindle motor driver 58. The control of the spindle motor 61 by the spindle motor driver 58 is as follows.
The processing is executed based on data supplied from the DVD data processing unit or data supplied from the CD servo seek control unit and the CD data processing unit 49. The tray motor 60 is
It is controlled by the tray motor driver 59. The control of the tray motor 60 by the tray motor driver 59 is executed based on data supplied from the DVD data processing unit 46 or the CPU 55.

The DVD data processing unit 46 receives the reproduction signal supplied from the reference amplifier 42,
Necessary data is stored in 47 and a predetermined demodulation process is performed on the reproduced signal. The demodulated reproduced signal is supplied to a SCSI interface control unit and a CD-ROM.
The data is supplied to the decoder 50 and output to an external device via the SCSI. The external device is a personal computer or the like. The RAM 51 functions as a SCSI interface control unit and a buffer for the CD-ROM decoder 50.

The CD servo seek control section and the CD data processing section 49 receive the reproduction signal supplied from the reference amplifier 42 and perform predetermined processing on the reproduction signal. The reproduction signal subjected to the predetermined processing is supplied to the SCSI interface control unit and the CD-ROM decoder 50, and is output to an external device via the SCSI. The reproduction signal reproduced from the music CD is supplied from the CD servo seek control section and the CD data processing section 49 to the CD data output amplifier 52. The CD data output amplifier 52 outputs an audio based on a reproduction signal reproduced from the music CD.

Next, the disc type determination will be described in detail.

As described above, the optical disk device shown in FIG. 2 can handle various optical disks. This is because the laser control unit 40 determines, according to the type of the optical disc,
This is for switching between the DVD mode and the CD mode for execution. Switching between DVD mode and CD mode
This is performed according to the type of the optical disk loaded in the optical disk device. That is, it is necessary to identify the type of the optical disk loaded in the optical disk device.

According to the present invention, the type of the optical disk is identified based on the focus error signal and the tracking error signal obtained from the servo amplifier 43 and the sum signal obtained from the reference amplifier 42. The sum signal includes a focus sum signal and a tracking sum signal indicating the reflectivity of the disk. In this embodiment, one of the focus sum signal and the tracking sum signal is used as the sum signal. .

Here, the types of the focus error signal, the tracking error signal, and the sum signal will be briefly described.

The first and second focus error signals include
There is a focus error signal. The first focus error signal is a focus error signal obtained from the servo amplifier 43 when the laser control unit 40 is executing the DVD mode. The second focus error signal is
This is a focus error signal obtained from the servo amplifier 43 when the laser control unit 40 is executing the CD mode.

The tracking error signal includes first and second tracking error signals. The first tracking error signal is a tracking error signal obtained from the servo amplifier 43 when the laser control unit 40 is executing the DVD mode. The second tracking error signal is a tracking error signal obtained from the servo amplifier 43 when the laser control unit 40 is executing the CD mode.

Further, the sum signal includes a first and a second sum signal. The first sum signal is output from the laser controller 40 to the DV signal.
When the D mode is executed, it is a sum signal obtained from the reference amplifier 42. The second sum signal is output when the laser control unit 40 executes the CD mode.
This is a sum signal obtained from the reference amplifier 42.

As described above, there are a total of six types of signals used to determine the type of optical disk. These 6
The types of signals are collectively referred to as detection signals. FIG. 8 illustrates a waveform diagram of the focus error signal. FIG. 9 illustrates a waveform diagram of the sum signal. FIG. 10 illustrates a waveform diagram of the tracking error signal. Hereinafter, features of the detection signal will be described.

First, the features of the focus error signal will be described. In the focus error signal, a large S-shaped curve appears near the just focus point. If the focus is not achieved, the amplitude of the S-shape becomes small.

The substrate thickness is 0.6 m with respect to the optical disk device.
When m DVD-based discs are loaded and the DVD mode is executed in the laser control unit 40, a signal of amplitude A1 is obtained as the first focus error signal.

The substrate thickness is 1.2 m with respect to the optical disk device.
m is loaded and a DVD mode is executed in the laser control unit 40,
As the first focus error signal, an amplitude A2 (<amplitude A
The signal of 1) is obtained.

The substrate thickness is 0.6 m with respect to the optical disk device.
m DVD-type disc is loaded and the CD mode is executed in the laser control unit 40,
As the first focus error signal, a signal of amplitude A3 is obtained.

The substrate thickness is 1.2 m with respect to the optical disk device.
m CD-type disc is loaded and the laser control unit 40 is executing the CD mode, the amplitude A4 (> amplitude A) is used as the second focus error signal.
The signal of 3) is obtained.

Next, the characteristics of the tracking error signal will be described. The tracking error signal is obtained by a detection method such as a push-pull method, a DPD method, and a three-beam method.

The output of the tracking error signal obtained by the push-pull method has a relatively large value when obtained from a disk on which a groove is formed, and has a relatively small value when obtained from a disk on which no groove is formed. Value. Further, the tracking error signal obtained by the push-pull method has a high waveform dependency. Therefore, the characteristics of the tracking error signal detected by the push-pull method are as follows.

A DVD-RAM or DVD-R is loaded in an optical disk device, and a laser control unit 40
In the case where the DVD mode is executed, a signal of the output level B1 is obtained as the first tracking error signal.

When a disc other than a DVD-RAM and a DVD-R is loaded in the optical disc device and the DVD mode is executed in the laser control unit 40, the output level B2 ( <Output level B1) signal is obtained.

For an optical disk device, a CD-R or CD
When -RW is loaded and the CD mode is executed in the laser control unit 40, a signal of the output level B3 is obtained as the second tracking error signal.

CD-R or CD
If a disc other than -RW is loaded and the laser control unit 40 is executing the CD mode, the output level B4 (<
The signal of the output level B3) is obtained.

The amplitude of the tracking error signal obtained by the DPD method is determined by the size of the pits formed on the disk and the passing speed of the pits. The characteristics of the tracking error signal detected by the DPD method are as follows.

When a DVD-ROM or DVD-R (data recorded) is loaded in the optical disk device and the DVD mode is executed in the laser control unit 40, the output level is output as the first tracking error signal. The signal of C1 is obtained.

When a disc other than a DVD-ROM or DVD-R (data recorded) is loaded in the optical disc device and the DVD mode is executed in the laser control unit 40, the first tracking error signal is output. , Output level C2 (<output level C1).

The output level of the tracking error signal obtained by the three-beam method depends on the track pitch formed on the disk. The characteristics of the tracking error signal detected by the three-beam method are as follows.

Music CD, CD for optical disc device
When -R or CD-RW is loaded and the laser control unit 40 is executing the CD mode, a signal of the output level D1 is obtained as the second tracking error signal.

Music CD, CD for optical disc device
When a disc other than -R or CD-RW is loaded and the laser control unit 40 is executing the CD mode, a signal of the output level D2 (<output level D1) is used as the second tracking error signal. can get.

Next, the features of the sum signal will be described.
The sum signal indicates the reflectivity of the disk. That is, the signal level of the sum signal obtained from the high-reflectance disk is
The value is relatively large in both the mode and the CD mode. Conversely, the signal level of the sum signal obtained from the low reflectance disk has a relatively small value in both the DVD mode and the CD mode. High reflectivity disks include, for example, CD-ROMs and DVD-ROMs.
Aluminum deposited disk. The low reflectance disk is, for example, an alloy disk such as a DVD-RAM and a CD-RW.

The reflectivity of a dye-based disc such as a CD-R depends on the wavelength of an irradiated light beam. Therefore, when the DVD mode is executed in the laser control unit 40, a relatively low level signal is obtained as the first sum signal. On the other hand, when the laser control unit 40 is executing the CD mode, a relatively high level signal is obtained as the second sum signal.

As described above, the detection signal has various characteristics. However, when attention is focused on only one signal, for example, when attention is focused only on the sum signal, the DVD-ROM and the C
Since the D-ROM is the same aluminum evaporated disk, the DV
The sum signal obtained from the D-ROM cannot be clearly distinguished from the sum signal obtained from the CD-ROM. Thus, the disc type cannot be identified by only one signal (sum signal). However, it is possible to identify the disc type by combining a plurality of signals and making a comprehensive determination. The present invention pays attention to this point and identifies the type of the disk.

Here, the disc type discriminating method of the present invention will be described with reference to the flowchart of FIG.

It is assumed that a predetermined disc is loaded in the optical disc apparatus shown in FIG. At this time, the CPU 55
Detects the loading of the predetermined optical disk (ST10, Y
ES), driving the spindle motor 61 (ST1)
2). Then, the CPU 55 instructs the laser control unit 40 to the disc type mode (ST14). Upon receiving the instruction of the disc type mode, the laser control unit 40 first executes the reproduction mode of the DVD mode (ST16). That is, the laser control unit 40 drives the first semiconductor laser 98 by controlling the laser power to a power suitable for reproduction (ST18). At this time, the first focus error signal and the first tracking error signal output from the servo amplifier 43 are
4 is input. Further, the first sum signal output from the reference amplifier 42 is also input to the disk type determination unit 44. The disc type discriminating unit 44 includes a first focus error signal, a first tracking error signal, and a first focus error signal.
The signal level of the sum signal is detected (ST20), and the signal level data of these signals is stored in the RAM 53.

Next, the laser controller 40 executes the CD mode (ST22). That is, the laser control unit 40
The second semiconductor laser 99 is driven (ST24). At this time, the second focus error signal and the second tracking error signal output from the servo amplifier 43 are input to the disc type discrimination unit 44. Further, the second sum signal output from the reference amplifier 42 is also input to the disk type determination unit 44. Disk type determination unit 44
Detects the signal levels of the second focus error signal, the second tracking error signal, and the second sum signal (ST
26) The signal level data of these signals is stored in the RAM 53.

The disc type discriminating section 44 calculates the first focus error signal, the first tracking error signal, the first sum signal, the second focus error signal, the second tracking error signal, and the second sum signal stored in the RAM 53. The type of the disc loaded in the optical disc device is determined based on the signal level (ST28).

Here, the disk type determination algorithm executed by the disk type determination unit 44 will be described with reference to the data tables shown in FIGS. FIG.
2 is a data table showing the relationship between the signal level range of the detection signal and the type of the disc. FIG. 13 is a data table showing the relationship between each disk and the signal level range of the detection signal. FIG. 14 is a data table showing the score status.

In disc type determination, a data table as shown in FIG. 12 is prepared in advance. That is, the signal level range of the detection signal is the range R1 (a1 <R1 ≦
a2), range R2 (a2 <R2 ≦ a3), range R3
(A3 <R3 ≦ a4), range R4 (a4 <R4 ≦ a
5) and the range R5 (a5 <R5 ≦ a6). Note that the magnitude relation between the signal levels a1 to a6 is shown in FIGS.
As shown in FIG. 10, a1 <a2 <a3 <a4 <a5 <
a6. Then, the type of the disk is determined for each signal level range of the detection signal. For example, Disk1
Is CD-ROM, Disk2 is DVD-ROM, Disc
k3 is DVD-RAM, Disk4 is CD-RW, Di
Let sk5 indicate CD-R.

The data table shown in FIG. 12 shows the type of the disc for each signal level range. On the other hand, the data table shown in FIG. 13 shows a signal level range for each disc type. It is assumed that the data table shown in FIG. 13 is stored in the ROM 54 in advance.

The disc type discriminating section 44 reads the data table stored in the ROM 54 and the signal level of the detection signal stored in the RAM 53. And RAM5
It is checked which signal level range the signal level of the detection signal read from 3 corresponds to.

It is assumed that as a result of the check, for example, the signal level range of the detection signal read from the RAM 53 is as shown in FIG. That is, sig1 (first focus error signal) is in the signal level range R2, sig2
(First tracking error signal) is in the signal level range R
3, sig3 (first sum signal) is a signal level range R4,
It is assumed that sig4 (second focus error signal) corresponds to the signal level range R2, sig5 (second tracking error signal) corresponds to the signal level range R3, and sig6 (second sum signal) corresponds to the signal level range R4.

Next, the disk type determining section 44
The type of the detection signal read from the disk 53 is determined. Specifically, the degree of approximation is calculated as to which disc type is close.

As shown in FIG. 14, sig1 corresponds to the signal level range R2. In this case, referring to the data table shown in FIG. 13, si of the signal level range R2
g1 corresponds to Disk1 and Disk2. That is, it is determined that sig1 of the signal level range R2 corresponds to Disk1 and Disk2. As a result, FIG.
As shown in FIG. 4, Disk1 and Disk2 of sig1
Is given a score of 2. Also, the fact that sig1 corresponds to the signal level range R2 means that sig1 is adjacent to the signal level ranges R1 and R3. In this case, referring to the data table shown in FIG. 13, sig1 of the signal level range R1 is Disk1
And Disk2. S of signal level range R3
ig1 corresponds to Disk3, Disk4, and Disk5. That is, sig1 of the signal level range R2
Are Disk1, Disk2, Disk3, Disk
4 and Disk5. Of these, Disk1 and Disk2 are signal level ranges R2
Is determined to correspond to sig1 of
Excluded from scoring. As a result, as shown in FIG. 14, Disk3, Disk4, and Di of sig1
In the column of sk5, score 1 is given.

As shown in FIG. 14, sig2 corresponds to the signal level range R3. In this case, referring to the data table shown in FIG. 13, si of the signal level range R3
g2 corresponds to Disk2 and Disk4. That is, it is determined that sig2 of the signal level range R3 corresponds to Disk2 and Disk4. As a result, FIG.
As shown in FIG. 4, Disk2 and Disk4 of sig2
Is given a score of 2. The fact that sig2 falls within the signal level range R3 means that sig2 is adjacent to the signal level ranges R2 and R4. In this case, referring to the data table shown in FIG. 13, sig2 of signal level range R2 is Disk2
And Disk4. S of signal level range R4
ig2 corresponds to Disk2 and Disk4. That is, sig2 of the signal level range R3 is determined to be close to Disk2 and Disk4. However, Di
sk2 and Disk4 are sig of the signal level range R3.
Since it has been determined that it corresponds to 2, it is excluded from the target for scoring. As a result, as shown in FIG.
In the columns of Disk1, Disk3, and Disk5 of sig2, a score of 0 is given.

Hereinafter, similarly, sig3, sig4,
A score is given to each of the sig5 and sig6 disc fields. Then, a total score is calculated for each disk. As a result of the total score calculation, the disk that has obtained the highest score is determined as the disk type determination result. That is, in the case of the data table shown in FIG.
k4.

After the disc type is determined by the above-described disc type discrimination processing, processing according to the disc type is executed. That is, when it is determined that the loaded disk is a DVD system, reproduction, recording, or erasing is performed by the first semiconductor laser 98. When it is determined that the loaded disk is a CD system, reproduction is performed by the second semiconductor laser 99.

In the disc type discrimination processing as described above, the disc type is discriminated comprehensively by combining a plurality of signals (detection signals), so that highly accurate discrimination processing can be realized. Further, the above-described disc type determination processing does not require a special mechanism, and can be realized at low cost. Further, the disc type discrimination processing as described above does not require the reproduction of a disc, so that the discrimination processing can be realized at high speed.

The optical disk device described in this embodiment is merely an example of the embodiment of the present invention, and the present invention is not limited to this. For example, the present invention can also be applied to an optical disc device configured to use both DVD and CD lasers. Also, the present invention provides a D
The present invention can also be applied to an optical disk device having a configuration in which a laser and a photodetector for both VD and CD are used. In other words, the present invention can be applied to an optical disk device having a configuration capable of acquiring a detection signal from a CD system and a detection signal from a DVD system.

[0112]

According to the present invention, it is possible to provide an optical disc type discriminating apparatus and an optical disc type discriminating method capable of discriminating the type of an optical disc quickly and accurately.

[Brief description of the drawings]

FIG. 1 is a view for explaining a schematic structure of a DVD optical disk.

FIG. 2 is a block diagram showing a schematic configuration of an optical disk device according to an embodiment of the disk type identification device of the present invention.

FIG. 3 is a plan view schematically showing a guide mechanism of the objective lens actuator.

FIG. 4 is a perspective view showing a schematic configuration of an objective lens actuator.

FIG. 5 is a sectional view showing the internal structure of the objective lens actuator.

FIG. 6 is a perspective view schematically showing a lens holder.

FIG. 7 is a diagram showing a schematic configuration of an objective lens actuator and an optical pickup.

FIG. 8 is a diagram showing an example of a waveform of a focus error signal.

FIG. 9 is a diagram illustrating an example of a waveform of a sum signal.

FIG. 10 is a diagram illustrating an example of a waveform of a tracking error signal.

FIG. 11 is a flowchart illustrating an optical disc type determination method.

FIG. 12 is a diagram showing an example of a data table showing a relationship between a signal level range of a detection signal and a disc type.

FIG. 13 is a diagram showing an example of a data table showing a relationship between each disk and a signal level range of a detection signal.

FIG. 14 is a diagram showing an example of a data table indicating a score status of each disk.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Optical disk 34 ... 1st objective lens 35 ... 2nd objective lens 42 ... Reference amplifier 43 ... Servo amplifier 44 ... Disc type discrimination part 46 ... DVD data processing part 53 ... RAM 54 ... ROM 55 ... CPU 94a ... 1st Photodetector 94b Second photodetector 98 First semiconductor laser 99 Second semiconductor laser

Claims (24)

[Claims] A light beam condensing means for converging a light beam on a predetermined optical disc; and a light beam condensing means for converging the light beam on the predetermined optical disc by the light condensing means. Moving means for moving the light condensing means; detecting means for detecting a reflected beam corresponding to the light beam reflected from the predetermined optical disk with the movement of the light condensing means by the moving means; A discriminating means for discriminating the type of the predetermined optical disc based on a detection result. 2. A condensing means for condensing a light beam on a predetermined optical disc; a moving means for moving the condensing means along a radial direction of the predetermined optical disc; Detecting means for detecting a reflected beam corresponding to the light beam reflected from the predetermined optical disk with movement of the optical means; determining means for determining a type of the predetermined optical disk based on a detection result of the detecting means A disc type discriminating apparatus, comprising: 3. A condensing means for condensing a light beam on a predetermined optical disc, and a light condensing means for converging the light beam on the predetermined optical disc by the condensing means, along an optical axis direction of the light beam. A first moving means for moving the light condensing means, a second moving means for moving the light condensing means along a radial direction of the predetermined optical disk, and a first moving means for moving the light collecting means by the first and second moving means. Detecting means for detecting a reflected beam corresponding to the light beam reflected from the predetermined optical disk with the movement; anddetermining means for determining a type of the predetermined optical disk based on a detection result of the detecting means. A disc type discriminating device comprising: 4. A light condensing means for converging a light beam on a predetermined optical disc, and a light condensing means for converging the light beam on the predetermined optical disc by the light condensing means along an optical axis direction of the light beam. A first moving means for moving the light condensing means, a second moving means for moving the light condensing means along a radial direction of the predetermined optical disk, and a first moving means for moving the light collecting means by the first and second moving means. With the movement, detecting means for detecting a reflected beam corresponding to the light beam reflected from the predetermined optical disc, based on the reflected beam detected by the detecting means, First output means for outputting a focus error signal corresponding to a focus state of the light beam; and light condensing by the light condensing means based on the reflected beam detected by the detection means. A second output unit that outputs a tracking error signal corresponding to the tracking state of the light beam; and a second output unit that outputs a sum signal corresponding to the reflectance of the predetermined optical disk based on the reflected beam detected by the detection unit. 3. A disc type discriminator, comprising: three output means; and discriminating means for discriminating the type of the predetermined optical disc based on each signal output from the first, second, and third output means. apparatus. 5. A condensing means for condensing a light beam on a predetermined optical disc, and said light condensing means converging the light beam on the predetermined optical disc by the condensing means along an optical axis direction of the light beam. A first moving means for moving the light condensing means, a second moving means for moving the light condensing means along a radial direction of the predetermined optical disk, and a first moving means for moving the light collecting means by the first and second moving means. With the movement, detecting means for detecting a reflected beam corresponding to the light beam reflected from the predetermined optical disc, based on the reflected beam detected by the detecting means, First output means for outputting a focus error signal corresponding to a focus state of the light beam; and light condensing by the light condensing means based on the reflected beam detected by the detection means. A second output unit that outputs a tracking error signal corresponding to the tracking state of the light beam; and a second output unit that outputs a sum signal corresponding to the reflectance of the predetermined optical disk based on the reflected beam detected by the detection unit. (3) output means; storage means for storing a signal level table indicating signal levels of a focus error signal, a tracking error signal, and a sum signal for each type of optical disc; and the signal level table stored in the storage means And discriminating means for discriminating the type of the predetermined optical disc based on the signal level of each signal output from the first, second, and third output means. Disk type determination device. 6. A condensing means for converging a light beam on a predetermined optical disc, and said light condensing means converging said light beam on said predetermined optical disc by said condensing means along an optical axis direction of said light beam. A first moving unit that moves the light collecting unit; a second moving unit that moves the light collecting unit along a radial direction of the predetermined optical disc; With the movement, detecting means for detecting a reflected beam corresponding to the light beam reflected from the predetermined optical disc, based on the reflected beam detected by the detecting means, First output means for outputting a focus error signal corresponding to a focus state of the light beam; and light condensing by the light condensing means based on the reflected beam detected by the detection means. A second output unit that outputs a tracking error signal corresponding to the tracking state of the light beam; and a second output unit that outputs a sum signal corresponding to the reflectance of the predetermined optical disk based on the reflected beam detected by the detection unit. (3) output means; storage means for storing a signal level table indicating a signal level range of a focus error signal, a tracking error signal, and a sum signal for each type of optical disc; and the signal level stored in the storage means Referring to the table, the degree of approximation is calculated as to which type of optical disc each signal level of each signal output from the first, second, and third output means is close to. A discriminating means for discriminating the type of the predetermined optical disc based on the disc type. 7. A condensing means for converging a first condensed beam and a second condensed beam different from the first condensed beam on a predetermined optical disc; First moving means for moving the condensing means along the optical axis direction of the first and second condensed beams to be condensed, and condensing means along the radial direction of the predetermined optical disc A second reflected light beam corresponding to the first focused light beam reflected from the predetermined optical disk with the movement of the light focusing unit by the first and second moving means, and Detecting means for detecting a second reflected beam corresponding to the second condensed beam reflected from the predetermined optical disk; determining means for determining a type of the predetermined optical disk based on a detection result of the detecting means; Equipped Disc type discriminating apparatus, characterized in that. 8. A focusing means for focusing a first focused beam and a second focused beam different from the first focused beam onto a predetermined optical disc; First moving means for moving the condensing means along the optical axis direction of the first and second condensed beams to be condensed, and condensing means along the radial direction of the predetermined optical disc A second reflected light beam corresponding to the first focused light beam reflected from the predetermined optical disk with the movement of the light focusing unit by the first and second moving means, and Detecting means for detecting a second reflected beam corresponding to the second condensed beam reflected from the predetermined optical disc; and detecting the first reflected beam based on the first reflected beam detected by the detecting means. Focused First output means for outputting a first focus error signal corresponding to a focus state of the first condensed beam; and light condensing by the first light condensing means based on the first reflected beam detected by the detection means. Second output means for outputting a first tracking error signal corresponding to the tracking state of the first converged beam, and a reflectance of the predetermined optical disk based on the first reflected beam detected by the detection means A third output means for outputting a first sum signal corresponding to the following, and a focus of the second condensed beam condensed by the second condensing means based on the second reflected beam detected by the detecting means. A fourth output unit that outputs a second focus error signal corresponding to the state; and the second focusing unit based on the second reflected beam detected by the detection unit. A fifth output means for outputting a second tracking error signal corresponding to a tracking state of the second condensed beam focused by the optical disc; and the predetermined optical disc based on the second reflected beam detected by the detection means. A sixth output means for outputting a second sum signal corresponding to the reflectance of the first, second, third, fourth, fifth, and sixth output means, A disc type discriminating apparatus comprising: a discriminating means for discriminating a type of a predetermined optical disc. 9. A condensing means for converging a first condensed beam and a second condensed beam different from the first condensed beam on a predetermined optical disc; First moving means for moving the condensing means along the optical axis direction of the first and second condensed beams to be condensed, and condensing means along the radial direction of the predetermined optical disc A second reflected light beam corresponding to the first focused light beam reflected from the predetermined optical disk with the movement of the light focusing unit by the first and second moving means, and Detecting means for detecting a second reflected beam corresponding to the second condensed beam reflected from the predetermined optical disc; and detecting the first reflected beam based on the first reflected beam detected by the detecting means. Focused First output means for outputting a first focus error signal corresponding to a focus state of the first condensed beam; and light condensing by the first light condensing means based on the first reflected beam detected by the detection means. Second output means for outputting a first tracking error signal corresponding to the tracking state of the first converged beam, and a reflectance of the predetermined optical disk based on the first reflected beam detected by the detection means A third output means for outputting a first sum signal corresponding to the following, and a focus of the second condensed beam condensed by the second condensing means based on the second reflected beam detected by the detecting means. A fourth output unit that outputs a second focus error signal corresponding to the state; and the second focusing unit based on the second reflected beam detected by the detection unit. A fifth output means for outputting a second tracking error signal corresponding to a tracking state of the second condensed beam focused by the optical disc; and the predetermined optical disc based on the second reflected beam detected by the detection means. A sixth output means for outputting a second sum signal corresponding to the reflectance of the optical disc, a first focus error signal, a first tracking error signal, a first sum signal, a second focus error signal, A tracking error signal, and a second
Storage means for storing a signal level table indicating the signal level of the sum signal; and referring to the signal level table stored in the storage means, the first, second, third, fourth, fifth And the sixth
Based on the signal level of each signal output from the output means,
A discriminating unit for discriminating the type of the predetermined optical disc; 10. A condensing means for converging a first condensed beam and a second condensed beam different from the first condensed beam on a predetermined optical disc; First moving means for moving the condensing means along the optical axis direction of the first and second condensed beams to be condensed, and condensing means along the radial direction of the predetermined optical disc A second reflected light beam corresponding to the first focused light beam reflected from the predetermined optical disk with the movement of the light focusing unit by the first and second moving means, and Detecting means for detecting a second reflected beam corresponding to the second condensed beam reflected from the predetermined optical disc; and detecting the first reflected beam based on the first reflected beam detected by the detecting means. Focused First output means for outputting a first focus error signal corresponding to the focus state of the first condensed beam, and collecting by the first condensing means based on the first reflected beam detected by the detecting means. A second output unit that outputs a first tracking error signal corresponding to a tracking state of the emitted first converged beam; and a reflection of the predetermined optical disk based on the first reflected beam detected by the detection unit. A third output unit that outputs a first sum signal corresponding to a rate, and a second condensed beam condensed by the second condensing unit based on the second reflected beam detected by the detecting unit. A fourth output unit for outputting a second focus error signal corresponding to a focus state; and a second focusing unit based on the second reflected beam detected by the detection unit. Fifth output means for outputting a second tracking error signal corresponding to the tracking state of the second condensed beam condensed by a stage, and the predetermined output based on the second reflected beam detected by the detection means. A sixth output means for outputting a second sum signal corresponding to the reflectance of the optical disc; a first focus error signal, a first tracking error signal, a first sum signal, a second focus error signal, 2 tracking error signal, and 2
Storage means for storing a signal level table indicating the signal level range of the sum signal; and referring to the signal level table stored in the storage means, the first, second, third, fourth, and fourth Fifth and sixth
Discriminating means for calculating the degree of approximation as to which type of optical disc each signal level of each signal output from the output means is close to, and discriminating the type of the predetermined optical disc based on the calculation result of this degree of approximation; A disc type discriminating device comprising: 11. A first light source for emitting a first light beam of a first wavelength.
Emitting means; second emitting means for emitting a second light beam having a second wavelength different from the first wavelength; and focusing the first light beam emitted from the first emitting means on a predetermined optical disk. A first condensing means having a first numerical aperture to be condensed; and a second numerical aperture different from the first numerical aperture for condensing the second light beam emitted from the second emitting means on the predetermined optical disc. A second condensing unit; and a first movement for moving the first condensing unit along an optical axis direction of a first condensed beam condensed on the predetermined optical disc by the first condensing unit. Means, a second moving means for moving the first light condensing means along a radial direction of the predetermined optical disc, and a second condensing means which condenses the predetermined optical disc by the second light condensing means. The second focusing means is moved along the optical axis direction of the light beam. A third moving means for moving, a fourth moving means for moving the second condensing means along a radial direction of the predetermined optical disc, and a movement of the first condensing means by the first and second moving means. A first reflected beam corresponding to the first focused beam reflected from the predetermined optical disc is detected.
Detecting means for detecting a second reflected beam corresponding to the second condensed beam reflected from the predetermined optical disk with movement of the second condensing means by the third and fourth moving means;
A disc type discriminating apparatus comprising: a detecting unit; and a discriminating unit that discriminates a type of the predetermined optical disc based on detection results of the first and second detecting units. 12. A first light source for emitting a first light beam of a first wavelength.
Emitting means; second emitting means for emitting a second light beam having a second wavelength different from the first wavelength; and focusing the first light beam emitted from the first emitting means on a predetermined optical disk. A first condensing means having a first numerical aperture to be condensed; and a second numerical aperture different from the first numerical aperture for condensing the second light beam emitted from the second emitting means on the predetermined optical disc. A second condensing unit; and a first movement for moving the first condensing unit along an optical axis direction of a first condensed beam condensed on the predetermined optical disc by the first condensing unit. Means, a second moving means for moving the first light condensing means along a radial direction of the predetermined optical disc, and a second condensing means which condenses the predetermined optical disc by the second light condensing means. The second focusing means is moved along the optical axis direction of the light beam. A third moving means for moving, a fourth moving means for moving the second condensing means along a radial direction of the predetermined optical disc, and a movement of the first condensing means by the first and second moving means. A first reflected beam corresponding to the first focused beam reflected from the predetermined optical disc is detected.
Detecting means for detecting a second reflected beam corresponding to the second condensed beam reflected from the predetermined optical disk with movement of the second condensing means by the third and fourth moving means;
Detecting means, based on the first reflected beam detected by the first detecting means, the first light beam condensed by the first light condensing means.
First output means for outputting a first focus error signal corresponding to the focus state of the condensed beam; and light condensed by the first light condensing means based on the first reflected beam detected by the first detection means. Said the first
A second output unit for outputting a first tracking error signal corresponding to a tracking state of the condensed beam; a second output unit configured to output a first tracking error signal corresponding to a reflectance of the predetermined optical disk based on the first reflected beam detected by the first detection unit; A third output unit that outputs a first sum signal, and the second light collected by the second light collection unit based on the second reflected beam detected by the second detection unit.
A fourth output unit that outputs a second focus error signal corresponding to a focus state of the condensed beam; and a second condensing unit that condenses the light based on the second reflected beam detected by the second detection unit. Said the second
Fifth output means for outputting a second tracking error signal corresponding to the tracking state of the condensed beam, and based on the second reflection beam detected by the second detection means, the fifth output means corresponding to the reflectance of the predetermined optical disk A sixth output unit that outputs a second sum signal; and a type of the predetermined optical disk based on each signal output from the first, second, third, fourth, fifth, and sixth output units. A disc type discriminating device comprising: discriminating means for discriminating. 13. A first light source for emitting a first light beam of a first wavelength.
Emitting means; second emitting means for emitting a second light beam having a second wavelength different from the first wavelength; and focusing the first light beam emitted from the first emitting means on a predetermined optical disk. A first condensing means having a first numerical aperture to be condensed; and a second numerical aperture different from the first numerical aperture for condensing the second light beam emitted from the second emitting means on the predetermined optical disc. A second condensing unit; and a first movement for moving the first condensing unit along an optical axis direction of a first condensed beam condensed on the predetermined optical disc by the first condensing unit. Means, a second moving means for moving the first light condensing means along a radial direction of the predetermined optical disc, and a second condensing means which condenses the predetermined optical disc by the second light condensing means. The second focusing means is moved along the optical axis direction of the light beam. A third moving means for moving, a fourth moving means for moving the second condensing means along a radial direction of the predetermined optical disc, and a movement of the first condensing means by the first and second moving means. A first reflected beam corresponding to the first focused beam reflected from the predetermined optical disc is detected.
Detecting means for detecting a second reflected beam corresponding to the second condensed beam reflected from the predetermined optical disk with movement of the second condensing means by the third and fourth moving means;
Detecting means, based on the first reflected beam detected by the first detecting means, the first light beam condensed by the first light condensing means.
First output means for outputting a first focus error signal corresponding to the focus state of the condensed beam; and light condensed by the first light condensing means based on the first reflected beam detected by the first detection means. Said the first
A second output unit for outputting a first tracking error signal corresponding to a tracking state of the condensed beam; a second output unit configured to output a first tracking error signal corresponding to a reflectance of the predetermined optical disk based on the first reflected beam detected by the first detection unit; A third output unit that outputs a first sum signal, and the second light collected by the second light collection unit based on the second reflected beam detected by the second detection unit.
A fourth output unit that outputs a second focus error signal corresponding to a focus state of the condensed beam; and a second condensing unit that condenses the light based on the second reflected beam detected by the second detection unit. Said the second
Fifth output means for outputting a second tracking error signal corresponding to the tracking state of the condensed beam, and based on the second reflection beam detected by the second detection means, the fifth output means corresponding to the reflectance of the predetermined optical disc. A sixth output means for outputting a second sum signal; a first focus error signal, a first tracking error signal, a first sum signal, a second focus error signal, a second tracking error signal, and a 2
Storage means for storing a signal level table indicating the signal level of the sum signal; and referring to the signal level table stored in the storage means, the first, second, third, fourth, fifth And the sixth
Based on the signal level of each signal output from the output means,
A discriminating unit for discriminating the type of the predetermined optical disc; 14. A first light source for emitting a first light beam of a first wavelength.
Emitting means; second emitting means for emitting a second light beam having a second wavelength different from the first wavelength; and focusing the first light beam emitted from the first emitting means on a predetermined optical disk. A first condensing means having a first numerical aperture to be condensed; and a second numerical aperture different from the first numerical aperture for condensing the second light beam emitted from the second emitting means on the predetermined optical disc. A second condensing unit; and a first movement for moving the first condensing unit along an optical axis direction of a first condensed beam condensed on the predetermined optical disc by the first condensing unit. Means, a second moving means for moving the first light condensing means along a radial direction of the predetermined optical disc, and a second condensing means which condenses the predetermined optical disc by the second light condensing means. The second focusing means is moved along the optical axis direction of the light beam. A third moving means for moving, a fourth moving means for moving the second condensing means along a radial direction of the predetermined optical disc, and a movement of the first condensing means by the first and second moving means. A first reflected beam corresponding to the first focused beam reflected from the predetermined optical disc is detected.
Detecting means for detecting a second reflected beam corresponding to the second condensed beam reflected from the predetermined optical disk with movement of the second condensing means by the third and fourth moving means;
Detecting means, based on the first reflected beam detected by the first detecting means, the first light beam condensed by the first light condensing means.
First output means for outputting a first focus error signal corresponding to the focus state of the condensed beam; and light condensed by the first light condensing means based on the first reflected beam detected by the first detection means. Said the first
A second output unit for outputting a first tracking error signal corresponding to a tracking state of the condensed beam; a second output unit configured to output a first tracking error signal corresponding to a reflectance of the predetermined optical disk based on the first reflected beam detected by the first detection unit; A third output unit that outputs a first sum signal, and the second light collected by the second light collection unit based on the second reflected beam detected by the second detection unit.
A fourth output unit that outputs a second focus error signal corresponding to a focus state of the condensed beam; and a second condensing unit that condenses the light based on the second reflected beam detected by the second detection unit. Said the second
Fifth output means for outputting a second tracking error signal corresponding to the tracking state of the condensed beam, and based on the second reflection beam detected by the second detection means, the fifth output means corresponding to the reflectance of the predetermined optical disk A sixth output means for outputting a second sum signal; a first focus error signal, a first tracking error signal, a first sum signal, a second focus error signal, a second tracking error signal, and a 2
Storage means for storing a signal level table indicating the signal level range of the sum signal; and referring to the signal level table stored in the storage means, the first, second, third, fourth, and fourth Fifth and sixth
Discriminating means for calculating the degree of approximation as to which type of optical disc each signal level of each signal output from the output means is close to, and discriminating the type of the predetermined optical disc based on the calculation result of this degree of approximation; A disc type discriminating device comprising: 15. A first step of condensing a light beam on a predetermined optical disc by a condensing means, and in the optical axis direction of the light beam condensed on the predetermined optical disc by the condensing means. Along with the moving process of moving the light condensing means, a second step of detecting a reflected beam corresponding to the light beam reflected from the predetermined optical disc, and based on a detection result of the second step, A third step of determining a type of a predetermined optical disk. 16. The method according to claim 1, further comprising: a first step of converging the light beam onto a predetermined optical disc by a condensing means; and a moving process of moving the condensing means along a radial direction of the predetermined optical disc. A second step of detecting a reflected beam corresponding to the light beam reflected from a predetermined optical disk; and a third step of determining a type of the predetermined optical disk based on a detection result of the second step. A disc type discriminating method, characterized in that: 17. A first step of converging a light beam on a predetermined optical disc by a condensing means, and in a direction of an optical axis of the light beam condensed on the predetermined optical disc by the condensing means. Along with the light beam reflected from the predetermined optical disk, a moving process of moving the light collecting unit along the radial direction of the predetermined optical disk along with the moving process of moving the light collecting unit along the radial direction of the predetermined optical disk. A disc type discriminating method, comprising: a second step of detecting the reflected beam thus obtained; and a third step of discriminating the type of the predetermined optical disc based on a detection result of the second step. 18. A first step of converging a light beam on a predetermined optical disc by a condensing means, and in a direction of an optical axis of the light beam condensed on the predetermined optical disc by the condensing means. Along with the light beam reflected from the predetermined optical disk, a moving process of moving the light collecting unit along the radial direction of the predetermined optical disk along with the moving process of moving the light collecting unit along the radial direction of the predetermined optical disk. A second step of detecting the reflected light beam, and outputting a focus error signal corresponding to a focus state of the light beam condensed by the light condensing means based on the reflected beam detected in the second step. Output processing for outputting a tracking error signal corresponding to a tracking state of the light beam condensed by the light condensing means; A third step of performing an output process of outputting a sum signal corresponding to the reflectance of the optical disk, and a fourth step of determining the type of the predetermined optical disk based on each signal output in the third step; A disc type discrimination method characterized by comprising: 19. A first step of converging a light beam on a predetermined optical disc by a condensing means, and in the optical axis direction of the light beam condensed on the predetermined optical disc by the condensing means. Along with the light beam reflected from the predetermined optical disk, a moving process of moving the light collecting unit along the radial direction of the predetermined optical disk along with the moving process of moving the light collecting unit along the radial direction of the predetermined optical disk. A second step of detecting the reflected light beam, and outputting a focus error signal corresponding to a focus state of the light beam condensed by the light condensing means based on the reflected beam detected in the second step. Output processing for outputting a tracking error signal corresponding to a tracking state of the light beam condensed by the light condensing means; A third step of executing an output process of outputting a sum signal corresponding to the reflectivity of the optical disc, and a signal level table indicating signal levels of the focus error signal, the tracking error signal, and the sum signal for each type of the optical disc And a fourth step of determining the type of the predetermined optical disk based on the signal level of each signal output in the third step. 20. A first step of converging a light beam on a predetermined optical disc by a condensing means, and in the optical axis direction of the light beam condensed on the predetermined optical disc by the condensing means. Along with the light beam reflected from the predetermined optical disk, a moving process of moving the light collecting unit along the radial direction of the predetermined optical disk along with the moving process of moving the light collecting unit along the radial direction of the predetermined optical disk. A second step of detecting the reflected light beam, and outputting a focus error signal corresponding to a focus state of the light beam condensed by the light condensing means based on the reflected beam detected in the second step. Output processing for outputting a tracking error signal corresponding to a tracking state of the light beam condensed by the light condensing means; A third step of executing an output process of outputting a sum signal corresponding to the reflectance of the optical disc, and a signal level indicating a signal level range of the focus error signal, the tracking error signal, and the sum signal for each type of the optical disc. Referring to the table, the degree of approximation is calculated as to which type of optical disc each signal level of each signal output in the third step is close to, and based on the calculation result of this degree of approximation, the type of the predetermined optical disc is calculated. A disc type discriminating method, comprising: a fourth step of discriminating the disc type. 21. A first step of converging a first light beam of a first wavelength emitted by a first emitting means on a predetermined optical disc by a first condensing means of a first numerical aperture; (1) a moving process for moving the first condensing unit along an optical axis direction of a first condensed beam condensed on the predetermined optical disk by the condensing unit; A second step of detecting a first reflected beam corresponding to the first condensed beam reflected from the predetermined optical disk in accordance with a moving process of moving the first condensing unit along with the second light emitting unit The second light beam having a second wavelength different from the first wavelength and emitted by the second
A third step of converging the predetermined optical disc by the second condensing means having a numerical aperture; and an optical axis of a second condensed beam condensed on the predetermined optical disc by the second condensing means. Along with a moving process of moving the second light-collecting means along a direction, and a moving process of moving the second light-collecting means along a radial direction of the predetermined optical disk, the light is reflected from the predetermined optical disk. A fourth step of detecting a second reflected beam corresponding to the second condensed beam, and a fifth step of determining the type of the predetermined optical disc based on the detection results of the second and fourth steps. A disc type discrimination method characterized by comprising: 22. A first step of converging a first light beam of a first wavelength emitted by a first emitting means on a predetermined optical disc by a first condensing means of a first numerical aperture; (1) a moving process for moving the first condensing unit along an optical axis direction of a first condensed beam condensed on the predetermined optical disk by the condensing unit; A second step of detecting a first reflected beam corresponding to the first condensed beam reflected from the predetermined optical disk in accordance with a moving process of moving the first condensing unit along the second step; Based on the first reflected beam detected by the first condensing means,
Output processing for outputting a first focus error signal corresponding to the focus state of the focused beam, outputting a first tracking error signal corresponding to the tracking state of the first focused beam focused by the first focusing means A third step of performing an output process of outputting a first sum signal corresponding to the reflectance of the predetermined optical disc; and a second wavelength different from the first wavelength emitted by the second emission unit. A second light beam is directed to a second light beam different from the first numerical aperture.
A fourth step of converging the predetermined optical disc by the second condensing means having a numerical aperture; and an optical axis of a second condensed beam condensed on the predetermined optical disc by the second condensing means. Along with a moving process of moving the second light-collecting means along a direction, and a moving process of moving the second light-collecting means along a radial direction of the predetermined optical disk, the light is reflected from the predetermined optical disk. A fifth step of detecting a second reflected beam corresponding to the second condensed beam, and based on the second reflected beam detected in the fifth step, Second
Output processing for outputting a second focus error signal corresponding to the focus state of the focused beam, outputting a second tracking error signal corresponding to the tracking state of the second focused beam focused by the second focusing means A sixth step of performing an output process of outputting a second sum signal corresponding to the reflectance of the predetermined optical disk; and a step of performing the predetermined process based on the signals output by the third and fifth steps. A discriminating method for discriminating the type of the optical disc. 23. A first step of converging a first light beam of a first wavelength emitted by a first emitting means on a predetermined optical disc by a first condensing means of a first numerical aperture; (1) a moving process for moving the first condensing unit along an optical axis direction of a first condensed beam condensed on the predetermined optical disk by the condensing unit; A second step of detecting a first reflected beam corresponding to the first condensed beam reflected from the predetermined optical disk in accordance with a moving process of moving the first condensing unit along the second step; Based on the first reflected beam detected by the first condensing means,
Output processing for outputting a first focus error signal corresponding to the focus state of the focused beam, outputting a first tracking error signal corresponding to the tracking state of the first focused beam focused by the first focusing means A third step of performing an output process of outputting a first sum signal corresponding to the reflectance of the predetermined optical disc; and a second wavelength different from the first wavelength emitted by the second emission unit. A second light beam is directed to a second light beam different from the first numerical aperture.
A fourth step of converging the predetermined optical disc by the second condensing means having a numerical aperture; and an optical axis of a second condensed beam condensed on the predetermined optical disc by the second condensing means. Along with a moving process of moving the second light-collecting means along a direction, and a moving process of moving the second light-collecting means along a radial direction of the predetermined optical disk, the light is reflected from the predetermined optical disk. A fifth step of detecting a second reflected beam corresponding to the second condensed beam, and based on the second reflected beam detected in the fifth step, Second
Output processing for outputting a second focus error signal corresponding to the focus state of the focused beam, outputting a second tracking error signal corresponding to the tracking state of the second focused beam focused by the second focusing means Performing an output process for outputting a second sum signal corresponding to the reflectance of the predetermined optical disc, a first focus error signal, a first tracking error signal, The first sum signal, the second focus error signal, the second tracking error signal, and the second
A seventh step of determining the type of the predetermined optical disc based on the signal level of each signal output in the third and sixth steps with reference to a signal level table indicating the signal level of the sum signal; A disc type discrimination method characterized by comprising: 24. A first step in which a first light beam of a first wavelength emitted by a first emitting means is focused on a predetermined optical disc by a first focusing means having a first numerical aperture. (1) a moving process for moving the first condensing unit along an optical axis direction of a first condensed beam condensed on the predetermined optical disk by the condensing unit; A second step of detecting a first reflected beam corresponding to the first condensed beam reflected from the predetermined optical disk in accordance with a moving process of moving the first condensing unit along the second step; Based on the first reflected beam detected by the first condensing means,
Output processing for outputting a first focus error signal corresponding to the focus state of the focused beam, outputting a first tracking error signal corresponding to the tracking state of the first focused beam focused by the first focusing means A third step of performing an output process of outputting a first sum signal corresponding to the reflectance of the predetermined optical disc; and a second wavelength different from the first wavelength emitted by the second emission unit. A second light beam is directed to a second light beam different from the first numerical aperture.
A fourth step of converging the predetermined optical disc by the second condensing means having a numerical aperture; and an optical axis of a second condensed beam condensed on the predetermined optical disc by the second condensing means. Along with a moving process of moving the second light-collecting means along a direction, and a moving process of moving the second light-collecting means along a radial direction of the predetermined optical disk, the light is reflected from the predetermined optical disk. A fifth step of detecting a second reflected beam corresponding to the second condensed beam, and based on the second reflected beam detected in the fifth step, Second
Output processing for outputting a second focus error signal corresponding to the focus state of the focused beam, outputting a second tracking error signal corresponding to the tracking state of the second focused beam focused by the second focusing means Performing an output process for outputting a second sum signal corresponding to the reflectance of the predetermined optical disc, a first focus error signal, a first tracking error signal, The first sum signal, the second focus error signal, the second tracking error signal, and the second
With reference to the signal level table indicating the signal level range of the sum signal, the degree of approximation of which type of optical disc each signal level of each signal output in the third and sixth steps is close to is calculated, 7. A disc type discriminating method, comprising: a seventh step of discriminating the type of the predetermined optical disc based on the calculation result of the degree of approximation.