JP2002133655A - Optical recording and reproducing equipment, discrimination method of optical disk, and starting method of optical recording and reproducing equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical recording and reproducing equipment that can discriminate the kind of an optical disk in a short time after loading the optical disk and before the execution of a focus search, a discrimination method of optical disk and a starting method of the optical recording and reproducing equipment. SOLUTION: An optical head 6 is equipped with a LED optical sensor detecting the reflected light amount of the LED light radiated to and reflected from an optical disk surface 6a and moves from the innermost circle position toward the outside by a spindle motor 3 and a guide screw 5A while the LED light is radiated toward the optical disk surface 2a from the LED optical sensor 8. An optical disk discrimination means 11 can discriminate many kinds of optical disks at the same time based on the changes of differential signal of distribution in the reflected light amount on the optical disk surface 2a received from the LED optical sensor 8.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical recording / reproducing apparatus for discriminating the type of an optical disk and performing a recording / reproducing operation on the optical disk in a method corresponding to the type.

[0002]

2. Description of the Related Art At present, CD (Compact Disc) systems and D
VD (Digital Versatile Disc) type optical discs have various specifications depending on the application. For CD-based optical discs,
CD, CD-ROM (CD-Read Only Memory), write-once CD-R (CD-Recordable), erasable and rewritable CD-RW (CD-ReWritabl using a phase change method)
e) and the like, and DVD (D
digital Versatile Disc), DVD-ROM (DVD-Read)
Only Memory), write-once DVD-R (DVD-Recordabl)
e), erasable and rewritable DVD-RAM (DVD
-Rewritable) and DVD-RW (DVD-Re-recordable).

Since there are many types of optical disks, an optical recording / reproducing apparatus such as a player is required to determine the type of the inserted optical disk. FIG. 12 and FIG. 13 are schematic configuration diagrams showing a conventional example of an optical recording / reproducing device capable of determining the type of an optical disk.

FIG. 12 shows a first conventional example (JP-A-9-23).
FIG. 1 is a schematic configuration diagram illustrating an optical disc device described in Japanese Patent No. 1670). When the optical disk device 100 described in this publication is loaded on the optical disk 103 by the loading device 102, light (non-laser light) 110 is emitted from the light emitting diode 109 toward one surface of the optical disk 103 prior to execution of the focus search. The reflected light is received by the photodiode 112, the comparing means 113 detects the level of the received light signal, and determines that the optical disk is a regular optical disk if the light receiving signal level is equal to or more than a predetermined threshold value. Laser light 10 from 106
7 is emitted to execute a focus search. On the other hand,
If the light receiving signal level is less than a predetermined threshold, the comparing means 1
13 determines that the optical disk is not a regular optical disk,
No. 4 unloads and discharges the optical disk 103 without instructing the focus adjustment, or causes the display device 115 to display that the optical disk 103 is not a proper optical disk.

As described above, the optical disc apparatus 100 performs the D based on the difference in the light reflectance of the surface of the optical disc 103.
It is possible to prevent erroneous loading of a CD-R instead of an optical disk such as a VD-R or a DVD-RAM. However, the discrimination function of the optical disc 103 before reproduction corresponds to only one type of CD-R, and discrimination of other types of optical discs must be performed based on reproduction data obtained after the focus search. For this reason, there has been a problem that the time required for the reproducing operation or the recording operation of the optical disk becomes long.

FIG. 13 shows a second conventional example (Japanese Unexamined Patent Publication No.
FIG. 20 is a schematic diagram showing a disc determination device 200) described in Japanese Patent No. 20625. This disc determination device 200 is a CD
The difference in track pitch between a system optical disk and a DVD system optical disk is used. As shown, the LED 207
Are emitted to the optical disk 201 via the condenser lens, and are diffracted and reflected by the pits 202 formed on the reflection film 203. When the optical disc 201 is a CD optical disc, the first-order diffracted light is received by the first light receiver 204, and when the optical disc 201 is a DVD having a narrow track pitch Pt, the first-order diffracted light is received by the second light receiver 205.
By discriminating the difference between the track pitches Pt, two types of optical discs, ie, a CD type and a DVD type, can be determined. However, in order to discriminate the various types of optical disks as described above, it is necessary to use the reproduction data obtained after the focus search as in the first conventional example. For this reason, as in the first conventional example, there is a problem that the time required for the reproducing operation or the recording operation of the optical disk is long.

[0007]

In the method of detecting the difference in light reflectance on the surface of an optical disk and the difference in track pitch with an optical sensor as in the first and second conventional examples, the types of optical disks that can be identified are scarce. However, all of the various types of optical disks cannot be determined in a short time. In order to discriminate many types of optical discs at once, reproduced data obtained after the focus search is essential, and the procedure after loading the optical disc becomes complicated. For this reason, the time required until the reproducing operation or the recording operation of the optical disk is started becomes long.

In view of the above problems, an object of the present invention is to provide an optical recording / reproducing apparatus, an optical disc discriminating method, and an optical recording / reproducing apparatus capable of discriminating the type of an optical disc in a short time after loading the optical disc. The point is to provide a method of starting.

[0009]

According to a first aspect of the present invention, there is provided an optical recording / reproducing apparatus for discriminating a type of an optical disk, which irradiates light onto the surface of the optical disk. An optical head having a light emitting means and a light receiving means for detecting the amount of light reflected by the optical disk surface; and the optical disk along the optical disk surface while the light emitting means irradiates light toward the optical disk surface. Scanning means for relatively moving the optical head in a direction intersecting with the circumferential direction of the optical head, and comparing the magnitude of a change in the amount of reflected light detected by the light receiving means with the relative movement of the optical head with a predetermined threshold. Determining means for determining the type of the optical disk.

According to a second aspect of the present invention, in the optical recording / reproducing apparatus according to the first aspect, the discriminating means further detects a change position of the reflected light amount distribution, and detects the change amount at the change position. The type of the optical disc is determined by comparing the magnitude of the optical disc with a predetermined threshold.

According to a third aspect of the present invention, there is provided the optical recording / reproducing apparatus according to the second aspect, wherein the optical disk has at least one surface having a mirror surface area on which information is not recorded and an outer peripheral side of the mirror surface region. An information recording area for recording information is provided concentrically and continuously, and the determination unit determines a change position and a change amount of the reflected light amount distribution near a boundary between the mirror surface area and the information recording area. It is to be calculated.

According to a fourth aspect of the present invention, in the optical recording and reproducing apparatus according to the third aspect, the discriminating means includes a reproducing data recording area in which the information recording area records reproduction data on an outer peripheral side thereof. Discriminating between a recording / reproducing optical disk having a recording management area used for recording or managing the reproduction data on an inner peripheral side thereof and a reproduction-only optical disk having the information recording area including only the reproduction data recording area; It is.

According to a fifth aspect of the present invention, there is provided the optical recording / reproducing apparatus according to the third or fourth aspect, wherein the discriminating means sets the information recording areas in different CDs.
(Compact Disc) optical disc and DVD (Digital Vers)
atile Disc) type optical disc.

The invention according to claim 6 is the invention according to claims 1 to 5
4. The optical recording / reproducing apparatus according to claim 1, wherein a light emitting diode is used as said light emitting means.

[0015] The invention according to claim 7 is the invention according to claims 1-5.
The optical recording / reproducing apparatus according to any one of the above, wherein a laser is used as the light emitting means.

Next, the invention according to claim 8 is an optical disc discriminating method for irradiating light toward the optical disc surface and discriminating the type of the optical disc by using the amount of reflected light,
(A) measuring the amount of reflected light by scanning the light along the surface of the optical disk in a direction intersecting the circumferential direction of the optical disk while irradiating light toward the surface of the optical disk; Calculating the amount of change in the reflected light amount distribution; and (c) determining the type of the optical disk by comparing the amount of change calculated in step (b) with a predetermined threshold. It is characterized by the following.

According to a ninth aspect of the present invention, in the optical disk discriminating method according to the eighth aspect, in the step (b), a change position of a reflection light amount distribution on the optical disk surface is further detected, and the step (c) is performed. 3), the type of the optical disc is determined by comparing the magnitude of the change amount at the change position with a predetermined threshold value.

According to a tenth aspect of the present invention, there is provided the optical disk discriminating method according to the ninth aspect, wherein the step (a) is performed.
In at least one side, the reflected light amount distribution of an optical disk having a mirror surface area on which information is not recorded and an information recording area on which information is recorded on the outer peripheral side of the mirror surface area are continuously and concentrically measured, In the step (c), a change position and a change amount of the reflected light amount distribution near a boundary between the mirror surface region and the information recording region are calculated.

The invention according to claim 11 is the invention according to claim 10
In the optical disc discriminating method described above, in the step (a), the information recording area is used for recording or managing the reproduction data on the outer circumference side of the reproduction data recording area and the inner circumference side of the reproduction data recording area. Measuring the reflected light amount distribution of one of a recording / reproducing optical disc including a recording management area and a read-only optical disc including the information recording area including only the reproduction data recording area;
In the step (c), the recording / reproducing optical disc and the reproduction-only optical disc are discriminated.

The invention according to claim 12 is the invention according to claim 10.
Or the optical disc discriminating method according to 11, wherein in the step (a), a CD (Compact Disc) -based optical disc and a DV
Measuring the distribution of the amount of reflected light of one of the D (Digital Versatile Disc) type optical disc and the step (c);
In the above, the CD optical disk and the DVD optical disk are discriminated.

The invention according to claim 13 is the invention according to claims 8 to
13. The optical disc discriminating method according to any one of 12, wherein in the step (a), a light emitting diode is used as a light source of light to be irradiated toward the surface of the optical disc.

The invention according to claim 14 is the invention according to claims 8 to
13. The optical disc discriminating method according to any one of 12, wherein in the step (a), a laser is used as a light source of light for irradiating the optical disc surface.

The invention according to claim 15 is the invention according to claim 1.
8. The method of starting an optical recording / reproducing apparatus according to any one of claims 1 to 7, further comprising: (d) loading an optical disk into the apparatus and loading; and (e) setting the optical head to a standby position and a predetermined maximum position. Irradiating light from the light emitting means of the optical head toward the surface of the optical disk in the process of moving between the inner peripheral position and detecting the reflected light amount distribution by the light receiving means; (G) performing a focus search on the optical disc after the steps (d) to (f) after the steps (d) to (f), and then performing a reproducing operation or a recording operation on the optical disc. And a step of starting.

[0024]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 FIG. 1 is a front view showing a schematic configuration of an optical recording / reproducing apparatus 1 according to Embodiment 1 of the present invention, and FIG. 2 is a plan view of the optical recording / reproducing apparatus 1 shown in FIG.

As shown in the figure, the optical head 6 has a laser light sensor 10 provided with an LD (laser diode), a light receiving element and an objective lens 7, and the laser light emitted from the LD passes through the objective lens 7. The light is irradiated onto the surface of the optical disk 2 and the reflected light is received by the light receiving element of the laser light sensor 10 via the objective lens 7. By detecting the reflected light amount of the laser light, the reproduction data recorded on the optical disk 2 is read. Also, the reproduction data can be written on the optical disk 2 by increasing the output of the laser beam.

The optical head 6 according to the present embodiment has an LED
And an LED light sensor 8 provided with a light receiving element. The LED light emitted from the LED is applied to the back surface of the optical disk 2 and the reflected light is received by the light receiving element and used for discrimination of the optical disk. The LED light sensor 8 may detect the change in the amount of reflected light incident on the light receiving element and the change in the center of gravity of the light.

One end of the optical head 6 has a thread motor 4
The other end is engaged with a guide member 5B disposed in parallel with the guide screw 5A so as to advance and retreat. Control unit 13
By controlling the drive of the thread motor 4, the optical head 6 can be moved along the surface of the optical disk 2 by being guided by the guide screw 5A and the guide member 5B.

In the first embodiment, the type of the optical disk 2 is determined by detecting the distribution of the amount of reflected light on the surface 2a of the optical disk facing the LED optical sensor 8 and processing the distribution of the amount of reflected light by the optical disk determining means 11. . The determination operation will be described below with reference to the flowchart of FIG.

First, the loading mechanism 12 loads (loads) the optical disk 2 inserted into the optical recording / reproducing apparatus 1, and places and holds the optical disk 2 on the turntable 9 connected to the drive shaft 3a of the spindle motor 3. (Clamp)
(ST1). As shown in FIG. 4, the optical disc 2
A clamp region is provided around the center hole 20, and an inner peripheral edge of the clamp region is locked and held by a claw member (not shown) provided on the turntable 9.

Next, the controller 13 controls the thread motor 4 from the point of loading the optical disk 2 to move the optical head 6 to a predetermined innermost position (ST2). After the optical head 6 is located at the innermost position, the controller 13
The LED light sensor 8 irradiates the LED light to the optical disk surface 2a by the control of (1), and the reflected light is detected by the light receiving element of the LED light sensor 8 to start measuring the amount of reflected light on the optical disk surface (ST3). The reflected light amount signal is sequentially transferred to the optical disk discriminating means 11. Next, the control unit 13 controls the thread motor 4 to move the LED optical sensor 8 toward the standby position near the outer periphery of the optical disc 2 at a predetermined speed and a predetermined distance along an irradiation movement line (irradiation locus) 25 shown in FIG. By moving the spot and scanning the spot 27 of the LED light on the optical disk surface 2a, a distribution of the amount of reflected light in the radial direction of the optical disk surface 2a is obtained (ST4).

Next, after the optical disk 2 moves to the standby position, the measurement of the amount of reflected light is completed (ST5), and the process proceeds to step ST5 where the optical disk discriminating means 11 processes the reflected light amount distribution. Is used to determine the type of the optical disk 2. The determination method will be described in detail below.

As shown in FIG. 4, on the data recording surface 2a of the optical disc 2, a clamp area 21 around a center hole 20, a mirror area 22 where no data is recorded toward the outer periphery thereof, A recording management area 23 and a reproduction data recording area 24 used for recording or management of the data are sequentially set. The record management area 23 is
CA (Power Calibration Area) and RMA (Record
ing Management Area). P
CA is an area for storing information for determining an optimum recording power for recording data on a recording / reproducing disc;
MA is a recording information management area. Recording management area 23
Are made of the same kind of material as the same kind of guide groove as the reproduction data recording area 24. Also, the reproduction data recording area 24
The radius of the inner peripheral end (hereinafter referred to as the lead-in radius) is specified by the standard.
m, the radius is 24 mm for a DVD disc. Here, when the optical disc 2 is a read-only disc, the recording management area 23 is not set, and the mirror area 22 and the reproduction data recording area 24 are provided continuously.

FIGS. 6 to 9 show the dimensions of the sides of various optical disks having such a structure. Figure 6 shows DVD-R and D
DVD for recording / reproduction such as VD-RW, FIG.
A read-only DVD such as a VD-ROM, FIG. 8 is a recording / reproduction CD such as a CD-R or CD-RW, and FIG.
FIG. 2 is a schematic diagram showing a read-only CD such as a ROM.

The recording / reproducing DVD 30 shown in FIG. 6 has an intermediate layer 30b including a recording film and a reflective film, a transmission layer 30a made of a light transmitting material on the recording surface side of the intermediate layer 30b, and a protective film on the rear surface side. And a back layer 30c including The intermediate layer 30b is divided into three areas having different light reflection characteristics: a mirror surface area 22 where data is not recorded and no guide groove is provided, a recording management area 23 where data is recorded, and a reproduction data recording area 24. In FIG. 6, r1 is the radius of the outer peripheral end of the mirror area 22 of the recording / reproducing DVD 30, and r2 is
The radius of the outer peripheral end of the recording management area 23, that is, the lead-in radius of the reproduction data recording area 24.

The read-only DVD 31 shown in FIG. 7 comprises an intermediate layer 31b including a reflection film, a transmission layer 31a made of a light transmission material on its recording surface, and a back layer 31c containing a protection film on its back surface. Is done. The intermediate layer 31b is a mirror surface area 22.
And the light reflection characteristics of the reproduced data recording area 24 are different 2
Divided into regions. The lead-in radius of the reproduction data recording area 24 is r2, which is the same as that of the recording / reproduction DVD 30.

The recording / reproducing CD 32 shown in FIG. 8 has an intermediate layer 32b including a recording film and a reflective film, a transmission layer 32a made of a light transmitting material on the recording surface side, and a back layer including a protective film on the back surface side. The intermediate layer 32b is divided into three regions having different light reflection characteristics of a mirror surface region 22, a recording management region 23, and a reproduction data recording region 24. In FIG. 8, r3 is a radius of the outer peripheral end of the mirror surface region 22, and r4 is
This is the radius of the outer peripheral end of the recording management area 23, that is, the lead-in radius.

The read-only CD 33 shown in FIG. 9 comprises an intermediate layer 33b including a reflection film, a transmission layer 33a made of a light transmission material on the recording surface side, and a back layer 33c including a protection film on the back side. And the intermediate layer 33b is a mirror surface region 2
2 and the reproduction data recording area 24 are divided into two areas having different light reflection characteristics. The lead-in radius of the reproduction data recording area 24 is the same r4 as that of the recording / reproduction CD 32.
It is.

As shown in FIGS. 6 to 9, it can be seen that DVD and CD optical discs can be classified into four types by combining the lead-in radius (r2, r4) and the outer peripheral edge radius (r1, r3) of the mirror surface area 22. . If the positions of the radii r1 to r4 are detected, the type of the optical disk can be determined.

Next, the light reflection characteristics of the optical disc shown in FIGS. 6 to 9 will be described. The light reflection characteristics of the intermediate layers 30b to 33b of CD-based discs and DVD-based discs are about 3
Are classified into two types. CD and CD have the highest light reflectivity
ROM, CD-R, DVD, DVD-ROM (single-layer type), and DVD-R. CD-R and DVD-R are recording / reproducing discs, and are made of a material having the same light reflection characteristics as a read-only disc. Also DV
D and DVD-ROMs include a two-layer type disc, and the light reflectivity of this type of disc is lower than that of the disc. CD-RW and DVD-RW have the lowest light reflectance. Mirror area 2
The light reflectance of No. 2 is higher than that of the recording management area 23 or the reproduction data recording area 24.

FIG. 10 shows such light reflection characteristics for the various optical disks shown in FIGS. The vertical axis of the graph indicates the LED in steps ST3 to ST5.
The light receiving level of the reflected light of the optical disk measured by the optical sensor 8 and the horizontal axis indicates the radius (r) in the optical disk. As shown in the graph, the upper part of the graph shows the curves LD1 (DVD-R) and LD3 (DV
D, DVD-ROM; single-layer type, curve LC1 (C
D, CD-ROM) and a curve LC2 (CD-R). The name of the optical disk corresponding to the curve is given in parentheses. These curves LD1, LD3, LC
1 and LC2 have distributions in which the amount of reflected light decreases at the positions of the radii r1, r2, r3 and r4. The curve LD4 (DVD, DVD-RO
M; two-layer type) has a distribution in which the amount of reflected light decreases at the position of the radius r2.

In the lower part of the graph, the curves LD2 (DVD-RW) and LC3 (CD
-RW) are gathered. The curves LD2 and LC3 have distributions in which the amount of reflected light decreases at the positions of the radii r1 and r3, respectively. For DVD-RW and CD-RW, curve L
As shown in D2 and LC3, since there is no remarkable difference in the light reflection characteristics between the recording management area 23 and the reproduction data recording area 24 in which the guide groove is formed and the mirror surface area 22, other types of optical discs It can be seen that the amount of reduction in the amount of reflected light is small as compared with.

FIG. 11 shows that the received light signal of the reflected light amount distribution shown in FIG. 10 is differentiated with respect to the radius r in order to make it easy to detect the amount of reduction of the reflected light amount at the boundaries of the radii r1 to r4. It is a graph shown. The horizontal axis of this graph indicates the radius (r) in the optical disc, and the vertical axis indicates the change level (differential signal level) of the amount of reflected light. In FIG. 11, curves dLC1 to dLC3 and dLD1 to dLD3 are respectively
FIG. 11 is obtained by differentiating the curves LC1 to LC3 and LD1 to LD3 shown in FIG. 10 once. The name of the optical disk corresponding to the curve is given in parentheses. As shown in FIG. 11, by detecting the amount of change of the differential signal at the timing corresponding to the positions of the radii r1 to r4, it is possible to determine the optical disk. The amount of change of the differential signal may be determined based on whether the differential signal is equal to or greater than a predetermined threshold level V.

Table 1 below shows the radii r1 to r4 in the optical disk.
9 shows various optical discs determined by the differential signal level (reflected light amount change level) φ at each position of r4.

[0044]

[Table 1]

As shown in Table 1, various types of optical discs can be classified into eight types in total by differentiating the reflected light amount change levels φ of the radii r1 to r4 to be equal to or more than the threshold value V. In the current optical recording / reproducing apparatus, “C
D, CD-ROM "," CD-R "," CD-RW ",
“DVD, DVD-ROM”, “DVD-R”, “DV
D-RW "may be classified into six types. As described above, it is possible to discriminate six types of optical discs that could not be achieved by the conventional technique at once before the focus search.

In the first embodiment, the optical head 6 moves the LED light spot 27 from the innermost position of the optical disk 2 to the standby position in the above-mentioned steps ST2 to ST3, that is, the inner surface of the optical disk 2 at the inner surface. Although the scanning is performed from the side toward the outer periphery, the scanning may be performed in the opposite direction. In such a case, the reflected light change level φ has a radius of r1 to r
4 is not a negative value but a positive value, and accordingly, the value of the threshold value V may be set as appropriate.

After the type of the optical disk 2 is determined by the optical disk determination means 11 as described above, the result of the determination is transmitted to the control unit 1.
3 is notified. Then, the control unit 13 determines whether or not the optical disc 2 cannot perform the reproduction / recording process with the optical recording / reproducing apparatus 1 (ST7). If the optical disc 2 cannot perform the reproduction / recording process, the display device ( (Not shown), or the loading mechanism 12
To unload the optical disk 2 from the apparatus and discharge it (ST8). On the other hand, if the optical disc is capable of reproducing and recording, the first focus search process is performed on the optical disc 2 (ST
9). Then, in step ST10, the control unit 13
Selects an optimal control sequence that matches the specifications of the optical disk 2 and records data on the optical disk 2 using the laser light sensor 10 according to the control sequence, or reads and reproduces recorded data on the optical disk 2. .

As described above, in the first embodiment, since various types of optical discs can be determined at once before the execution of the focus search in step ST9, the data reproducing operation or the recording operation on the optical disc is started in a short time. It becomes possible.

In the steps ST2 to ST4, the operation of moving the optical head 6 to the innermost position to set the initial position of the thread motor 4 and the like with respect to the optical disk 2 is an indispensable operation in the ordinary positioning process of the optical head 6. In this embodiment, the reflected light distribution on the optical disk surface 2a is detected in the process of moving the optical disk from the standby position to the predetermined innermost position in parallel with this operation. There is an advantage that no time loss occurs. Therefore, it is possible to prevent the startup time from increasing due to the addition of the optical disk discriminating function as in the case of the above-described conventional example.

The wavelength dependence of the organic dye used on the recording surface of the CD-R is such that the center wavelength of the LED light is 78 since the wavelength is around 780 nm and the reflectance is high and the light absorption is small.
It is desirable to be around 0 nm. Further, since the LED light used in the present embodiment is irradiated on the optical disk surface with divergent light or parallel light, there is an advantage that it is difficult to change the properties of the recording medium of the optical disk.

In the optical recording / reproducing apparatus 1 according to the first embodiment, the LED optical sensor 8 is used as means for detecting the light reflection characteristics of the optical disk 2. Instead, when the optical head 6 includes a tilt sensor that measures the tilt angle of the optical disc 2 by irradiating light toward the optical disc surface 2a and measuring the reflection angle, the light receiving signal of the tilt sensor is provided. May be used to perform the same optical disc determination processing as in the present embodiment.

Embodiment 2 Next, a second embodiment of the present invention will be described. The device configuration of the second embodiment is substantially the same as the configuration of the first embodiment. In the second embodiment, the LED light sensor 8 is not used to determine the type of the optical disc 2, but the laser light sensor 10 is used.
The center wavelength of the laser beam applied to the optical disk surface 2a is about 650 nm for recording / reproducing a DVD-based disk.
About 650nm and about 780n for CD disc playback
m is desirable. In particular, in the reproduction of CD-R, the center wavelength of the laser light is about 780 nm, which increases the surface reflectance of the optical disc due to the wavelength dependence of the organic dye described above.
Is desirable. As a result, when data is reproduced from the CD-R, a change in the properties of the recording medium of the CD-R hardly occurs, and erroneous recording hardly occurs. For example, when the center wavelength of the laser light is about 650 nm for recording / reproducing a DVD disc, the surface reflectance of the CD-R is low, the absorption of irradiation light is large, and the rotation speed of the optical disc during irradiation of the laser light is increased. If the laser output becomes slow or the laser output increases, the properties of the recording medium tend to change.

The processing operation of the optical disk according to the second embodiment is substantially the same as the processing operation according to the first embodiment except that laser light is used instead of LED light.
The processing operation will be described with reference to the flowchart of FIG. 3. First, the loading mechanism 12 loads the optical disc 2 inserted in the optical recording / reproducing apparatus 1, and places and holds the optical disc 2 on the turntable 9 (ST1). ). Next, from the point of loading the optical disk 2, the control unit 13 controls the thread motor 4 to move the optical head 6 to a predetermined innermost position (ST2). The laser beam is radiated from the LD to the optical disk surface 2a via the objective lens 7 and the reflected light is detected by the light receiving element of the laser light sensor 10 via the objective lens 7 to start measuring the amount of reflected light (ST3). .

Subsequently, the control section 13 controls the thread motor 4 to move the optical head 6 to the standby position at a predetermined speed at a predetermined speed for a predetermined distance, and the laser beam spot along the irradiation moving line (irradiation locus) 28 shown in FIG. By causing the optical disk 2 to scan the optical disk surface 2a, a reflected light amount distribution in the radial direction of the optical disk 2 is obtained (ST4).

Next, after the measurement of the reflected light amount distribution is completed (ST5), the process proceeds to step ST6, and the type of the optical disk 2 is determined in the same procedure as in the first embodiment. Thereafter, after steps ST6 to ST10 are executed, a series of processing ends.

As described above, in the second embodiment, since the laser light source of the laser light sensor 10 used for recording or reproducing information on or from the optical disk is used, it is not necessary to separately provide a sensor for determining the optical disk. In addition, it is possible to reduce the size of the optical recording / reproducing apparatus and save space.

[0057]

As described above, according to the optical recording / reproducing apparatus according to the first aspect of the present invention and the optical disk discriminating method according to the eighth aspect, a plurality of areas having different light reflection characteristics are provided on one side of the optical disk. Since it is provided concentrically and the amount of change in the reflected light amount distribution near the boundary between the regions can be detected, it is possible to discriminate at once all types of optical discs that could not be achieved conventionally.

According to the second and ninth aspects, more types of optical discs can be determined at a time.

According to claims 3 and 10,
By utilizing the fact that the light reflection characteristics of the mirror region and the information recording region of a general optical disk are different, it is possible to determine the optical disk classified by the difference in the boundary position between the two regions.

According to claims 4 and 11,
DVD-R, DVD-RW, CD-R and CD-RW
It is possible to determine at a time a recording / reproducing optical disc provided with a recording management area such as a DVD, a DVD-ROM, a CD, a CD-ROM or the like, a reproduction-only optical disc having no recording management area. Become. The inner edge of the information recording area of the recording / reproducing optical disk is shifted by the amount set for the recording management area as compared with that of the read-only optical disk, so the boundary between the information recording area and the mirror surface area is provided between the two optical disks. The position is different. Therefore, by detecting the amount of change in the reflected light amount distribution at the boundary, it is possible to determine whether the type of the optical disk is for reproduction only or for recording and reproduction.

According to claims 5 and 12,
Since the change position of the reflected light amount distribution is different due to the different setting range of the information recording area, the CD optical disc and the D
It is possible to determine at a time a VD optical disk.

According to claims 6 and 13,
Since the LED light is radiated to the optical disk surface with divergent light or parallel light, it is possible to determine the type of the optical disk without changing the properties of the recording medium of the optical disk as compared with the laser light.

According to claims 7 and 14,
Since the laser light sensor mounted on the optical head can be used as a substitute, there is no need to separately prepare a sensor for discriminating the optical disk, and the device can be reduced in size and space can be saved.

According to the fifteenth aspect, the operation of moving the optical head to the innermost peripheral position and setting the initial position of the thread motor or the like with respect to the optical disk is an essential operation in a normal optical head positioning process. By measuring the reflected light amount distribution of the optical disk during the movement of the optical head between the standby position and the innermost position with this operation, there is no time loss in the optical disk discriminating operation, and the reproduction of the optical disk is performed. The time required for the operation or the recording operation can be shortened.

[Brief description of the drawings]

FIG. 1 is a front view showing a schematic configuration of an optical recording / reproducing apparatus according to an embodiment of the present invention.

FIG. 2 is a plan view of the optical recording / reproducing apparatus shown in FIG.

FIG. 3 is a flowchart showing a processing operation by the optical recording / reproducing apparatus according to the first embodiment.

FIG. 4 is a front view showing a schematic configuration of an optical disc.

FIG. 5 is a diagram showing trajectories of LED light and laser light applied to the optical disk surface.

FIG. 6 is a schematic diagram showing dimensions of a side portion of a recording / reproducing DVD.

FIG. 7 is a schematic diagram showing dimensions of a side portion of a read-only DVD.

FIG. 8 is a schematic diagram showing dimensions of a side portion of a recording / reproducing CD.

FIG. 9 is a schematic view showing dimensions of a side portion of a read-only CD.

FIG. 10 is a diagram showing a reflected light amount distribution of various optical disks.

FIG. 11 is a diagram showing a change level of the reflected light amount distribution shown in FIG.

FIG. 12 is a schematic configuration diagram showing a first conventional example of an optical recording / reproducing apparatus.

FIG. 13 is a schematic configuration diagram showing a second conventional example of an optical recording / reproducing apparatus.

[Explanation of symbols]

Reference Signs List 1 optical recording / reproducing device, 2 optical disk, 2a recording surface, 3 spindle motor, 3a drive shaft, 4 thread motor, 5A guide screw, 5B guide screw, 6 optical head, 7 objective lens, 8 LED optical sensor, 9 turntable , 10 laser light sensor, 11 optical disk discriminating means, 12 loading mechanism, 13 control unit.

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Mitsuru Irie 2-3-2 Marunouchi, Chiyoda-ku, Tokyo Mitsubishi Electric Corporation F-term (reference) 5D090 AA01 BB02 BB03 BB04 CC04 CC18 DD03 HH01 JJ11 5D117 AA02 CC07 DD03 EE08

Claims (15)

[Claims] 1. An optical recording / reproducing apparatus for discriminating a type of an optical disk, comprising: a light emitting unit for irradiating light to a surface of the optical disk;
An optical head having light receiving means for detecting the amount of light reflected on the optical disk surface; and while the light emitting means irradiates light toward the optical disk surface, a circumferential direction of the optical disk along the optical disk surface. Scanning means for relatively moving the optical head in the intersecting direction; and comparing the amount of change in the reflected light amount distribution detected by the light receiving means with the relative movement of the optical head and a predetermined threshold to determine the type of the optical disc. An optical recording / reproducing apparatus, comprising: a determination unit for determining. 2. The optical recording / reproducing apparatus according to claim 1, wherein said discriminating means further detects a change position of said reflected light amount distribution, and determines a magnitude of the change amount at said change position and a predetermined threshold value. An optical recording / reproducing apparatus that determines the type of an optical disc by comparing the types of optical discs. 3. The optical recording / reproducing apparatus according to claim 2, wherein the optical disc has at least one side with a mirror area where no information is recorded and an information recording area where information is recorded on an outer peripheral side of the mirror area. The determination means calculates a change position and a change amount of the reflection light amount distribution near a boundary between the mirror surface region and the information recording region, and optical recording / reproducing. apparatus. 4. The optical recording / reproducing apparatus according to claim 3, wherein said discriminating means includes: a reproduction data recording area in which the information recording area records reproduction data on an outer peripheral side; An optical recording / reproducing apparatus for discriminating between a recording / reproducing optical disk including a recording management area used for recording or managing data and a reproduction-only optical disk having the information recording area including only the reproduction data recording area. 5. The optical recording / reproducing apparatus according to claim 3, wherein said discriminating means includes a CD (Compact Disc) optical disc and a DVD (Dig) whose setting ranges of said information recording area are different from each other.
It is an optical recording / reproducing device that discriminates it from an ital versatile disc type optical disc. 6. The optical recording / reproducing apparatus according to claim 1, wherein a light-emitting diode is used as the light-emitting means. 7. The optical recording / reproducing apparatus according to claim 1, wherein a laser is used as the light-emitting means. 8. An optical disc discriminating method for irradiating light toward the optical disc surface and discriminating the type of the optical disc by utilizing the amount of reflected light, wherein (a) while irradiating the optical disc surface with light, Scanning the light along the surface of the optical disc in a direction intersecting the circumferential direction of the optical disc to measure the reflected light quantity distribution; (b) calculating the variation of the reflected light quantity distribution; )
Determining the type of the optical disk by comparing the amount of change calculated in the step (b) with a predetermined threshold value. 9. The optical disk discriminating method according to claim 8, wherein in the step (b), a change position of the distribution of the reflected light amount on the surface of the optical disk is further detected, and in the step (c), the change position in the change position is detected. An optical disc discrimination method for discriminating the type of the optical disc by comparing the magnitude of the change with a predetermined threshold. 10. The optical disc discriminating method according to claim 9, wherein in said step (a), an information recording area for recording information on at least one side of a mirror surface area on which information is not recorded and an outer peripheral side of said mirror surface area. And measuring the reflected light amount distribution of the optical disk having the concentric and continuous optical disks provided therein. In the step (c), a change position of the reflected light amount distribution near a boundary between the mirror surface area and the information recording area, An optical disc determination method for calculating a change amount. 11. The optical disk discriminating method according to claim 10, wherein in said step (a), said information recording area has a reproduction data recording area for recording reproduction data on an outer peripheral side thereof and said reproduction data recording area on an inner peripheral side thereof. The reflection light amount distribution of one of a recording / reproducing optical disk including a recording management area used for recording or managing data and a reproduction-only optical disk including the reproduction data recording area only as the information recording area is measured. In the step (c),
An optical disc discriminating method for discriminating between the recording / reproducing optical disc and the read-only optical disc. 12. The optical disc discriminating method according to claim 10, wherein, in the step (a), a CD (Compacac) in which a setting range of the information recording area is different from each other.
t Disc) optical disc and DVD (Digital Versatile Di)
An optical disc discrimination method, wherein the reflected light quantity distribution of any one of the sc optical disc and the optical disc is measured, and in the step (c), the CD optical disc and the DVD optical disc are discriminated. 13. The optical disc discriminating method according to claim 8, wherein in the step (a), a light emitting diode is used as a light source of light for irradiating the optical disc surface. Optical disc identification method. 14. The optical disc discriminating method according to claim 8, wherein in the step (a), a laser is used as a light source of light for irradiating the surface of the optical disc. Judgment method. 15. A method for activating an optical recording / reproducing apparatus according to claim 1, wherein: (d) loading an optical disc into the apparatus and loading the optical disc;
(E) In the process of the optical head moving between a standby position and a predetermined innermost position, light is emitted from the light emitting means of the optical head toward the optical disk surface, and the amount of reflected light is reflected by the light receiving means. Detecting the distribution; (f) determining the type of the optical disk based on the reflected light amount distribution; and (g) performing a focus search on the optical disk after the steps (d) to (f). And thereafter starting a reproducing operation or a recording operation on the optical disk.