JPH05114234A - Recording and/or replay apparatus and recording disk - Google Patents

Abstract

PURPOSE:To discriminate the type of a disk without a complicated constitution by a method wherein a recording medium is discriminated on the basis of the detection result of a reflected light flux from a type indication part on the recording medium. CONSTITUTION:A groove 2 is formed in the inner circumferential part of a signal write and readout face la on an optical disk 1 for both write and readout use. It is used as a disk-type indication part. A protruding and recessed pattern is formed in the groove 2. When the groove 2 which is formed between a signal recording region and a chucking hole 1b and which is formed so as to surround the whole circumference of the hole 1b is irradiated with a laser beam flux for readout use, the laser beam flux is refracted and the light intensity of a reflected light flux is stronger in the mirror-face region around the hole 1b. A change in the light intensity is detected, a piece of information is read out and a medium can be discriminated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording and / or reproducing apparatus for writing and / or reading an information signal on a recording medium. The present invention also relates to a recording disk used as a recording medium for writing and / or reading an information signal.

[0002]

2. Description of the Related Art Conventionally, a recording and / or reproducing apparatus for writing and / or reading an information signal on a recording medium has been proposed. In addition, a recording disk that is a recording medium used in such a recording and / or reproducing apparatus has been proposed.

In the so-called optical system, the above-mentioned recording and / or reproducing apparatus can write and / or read an information signal to / from a recording medium having a signal recording layer made of a magnetic material or a metal material. The optical pickup device is configured to irradiate the signal recording layer with a light beam and detect the light beam reflected by the signal recording layer. A recording medium having a signal recording layer made of the above magnetic material, that is, a recording and / or reproducing apparatus capable of writing an information signal to a so-called magneto-optical recording medium, applies a magnetic field to the signal recording layer. It also has a magnetic field generator for applying.

On the other hand, in the case of the optical type, the above-mentioned recording disc has a disc substrate made of a transparent material and a signal recording layer made of a magnetic material or a metal material adhered to the disc substrate. Is configured. A recording disk having a signal recording layer made of a metal material is a recording disk dedicated to reading information signals, and writing of information signals to this recording disk is performed by means of injection molding or the like when the disk substrate is manufactured. The recording disk having the signal recording layer made of the magnetic material is a so-called magneto-optical disk for both writing and reading of information signals, and the writing of information signals to the magneto-optical disk is performed by the recording and reproducing apparatus. ..

When writing or reading an information signal to or from the signal recording layer of these recording disks, a light beam is applied to the signal recording layer. In order to read the information signal from the read-only optical disc, the signal recording layer of the optical disc is irradiated with a light beam having a constant light output, and the light amount of the reflected light beam of this light beam is detected. To read an information signal from the magneto-optical disk, the signal recording layer of the magneto-optical disk is irradiated with a light beam having a constant light output, and the transition of the reflected light beam in the polarization direction is detected.

Writing of an information signal to the magneto-optical disk is performed by irradiating the signal recording layer with a light beam having a high optical output and applying a magnetic field to the signal recording layer.

[0007]

By the way, in the recording and / or reproducing apparatus as described above, both the read-only optical recording medium and the magneto-optical recording medium can be used as the recording medium. There is one configured in. In such a recording and / or reproducing apparatus, there are three types of operation modes: reading from the read-only optical recording medium, reading from the magneto-optical recording medium, and writing to the magneto-optical recording medium. It is executed selectively.

In the recording and / or reproducing apparatus, in the mode in which the information signal is read from the read-only optical recording medium, the optical output of the luminous flux is set to a predetermined constant value, and the optical recording medium of the luminous flux is used. The light intensity of the reflected light flux of is detected.

Further, the recording and / or reproducing apparatus sets the optical output of the light flux to a predetermined constant value in the mode for reading the information signal from the magneto-optical recording medium, and the optical recording of the light flux. The transition of the polarization direction of the light flux reflected from the medium is detected.

And, this recording and / or reproducing apparatus is
In the mode in which the information signal is written in the magneto-optical recording medium, the optical output of the light flux is made high so that the signal recording layer of the optical recording medium can be heated.

That is, in the above-mentioned recording and / or reproducing apparatus, it is necessary to appropriately perform the switching operation of the light output of the light beam according to the medium type of the recording medium. The manual operation of this switching operation complicates the operation of the recording and / or reproducing apparatus.

Further, in the recording disk, since it is possible to identify the disk type such as the read-only optical disk or the magneto-optical disk in the recording and / or reproducing apparatus, the shape is changed according to the disk type. Some are stored in a cartridge.

Such a recording disk is used for the above recording and / or
Or, when used in a reproducing apparatus, the recording and / or reproducing apparatus identifies the disc type of the recording disc through shape determining means such as a micro switch provided in the recording and / or reproducing apparatus. , Select an operation mode according to the identified disk type.

Therefore, in this recording disc, at least a part of the shape of the cartridge for accommodating the recording disc must be different according to the disc type.

That is, in the case of a recording disk housed in a cartridge whose shape is different according to the disk type, it is necessary to prepare a plurality of types of cartridges corresponding to the disk type, which complicates the manufacturing. Further, in the recording and / or reproducing apparatus configured to identify the disc type of the recording disc, it is necessary to include shape determining means for determining the other shape, and therefore the apparatus configuration becomes complicated and It is difficult to reduce the size.

Therefore, the present invention is proposed in view of the above-mentioned circumstances, and the structure is not complicated,
An object of the present invention is to provide a recording and / or reproducing apparatus capable of identifying the medium type of a recording medium.

Another object of the present invention is to provide a recording disk capable of indicating the disk type without changing the shape or the like of the cartridge.

[0018]

In order to solve the above problems and achieve the above objects, a recording and / or reproducing apparatus according to the present invention is a writing device for writing and / or reading an information signal to / from a recording medium. And / or reading means, a light flux irradiating means for irradiating a medium type indicator provided on the recording medium with a light flux, and a light flux detecting means for detecting a reflected light flux of the light flux from the medium type indicating section by the light flux illuminating means. Means and
An identification unit for identifying the medium type of the recording medium based on the detection result of the reflected light beam by the light beam detection unit is provided.

Further, the recording disk according to the present invention comprises a signal recording surface section capable of writing and / or reading an information signal, and a disk type indicating section provided on at least a part of the signal recording surface section. The disc type indicator has an uneven pattern portion according to the disc type.

[0020]

In the recording and / or reproducing apparatus according to the present invention, the luminous flux emitted from the luminous flux irradiating means to the medium type indicating section provided on the recording medium is reflected by the medium type indicating section. Since the discriminating means discriminates the medium type of the recording medium based on the detection result of the luminous flux detecting means for detecting, it is not necessary to perform various switching operations according to the medium type by manual operation or the like.

Further, in the recording disc according to the present invention, the disc type indicating portion provided on at least a part of the signal recording surface portion where the information signal can be written and / or read is provided with an uneven pattern depending on the disc type. Since it has a section, the disc type can be identified by optically reading it, and the disc type can be identified without being rotated.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Specific embodiments of the present invention will be described below with reference to the drawings. The recording disc according to the present invention is of a disc type of either the read / write optical disc 1 shown in FIG. 1 capable of writing and reading information signals, or the read-only optical disc 5 shown in FIG. 5 capable of only reading information signals. It is configured as a recording disk.

As shown in FIG. 1, the read / write optical disk 1 is composed of a disk substrate made of a transparent material such as polycarbonate. This writing / reading optical disc 1 is mounted on the disc substrate.
However, a chucking hole 1b is formed in the center of the recording and / or reproducing device to be described later.

In the optical disk 1 for both reading and writing, the main surface portion on one side is a signal writing / reading surface 1a. The signal writing / reading surface 1a is formed by depositing a signal recording layer made of a magnetic material on the other main surface portion of the disk substrate. An information signal is written in this signal recording layer. That is, writing and reading of the information signal to and from the signal recording layer are performed through the disc substrate from the signal writing / reading surface 1a.

The read / write optical disk 1 is a so-called magneto-optical disk, which heats a local portion of the signal recording layer to a temperature not lower than the so-called Curie temperature to eliminate the coercive force and causes an external magnetic field to the local portion. Is applied to invert the magnetization direction of the signal recording layer in the local portion to write an information signal.
Writing of an information signal to the signal recording layer is performed along a recording track formed in a spiral shape in a substantially concentric shape in a signal recording area over substantially the entire main surface of the read / write optical disk 1. Be seen.

Local heating of the signal recording layer can be performed by converging and irradiating a laser beam. The external magnetic field can be applied by using a magnetic head device or the like.

In writing such an information signal, a method of modulating the optical power of the laser beam according to the information signal is called an optical modulation method, and a method of modulating the intensity of the external magnetic field according to the information signal. Is called a magnetic field modulation method.

To read an information signal from the signal recording layer of the read / write optical disk 1, a laser beam is focused and irradiated on the signal recording layer, and the laser beam reflected by the signal recording layer is reflected. Is detected. On the signal recording layer, the laser beam causes a transition in the polarization direction due to the so-called Kerr effect, depending on the magnetization direction of the signal recording layer. Therefore, the information signal can be read by detecting the transition of the polarization direction in the reflected light flux.

On the inner peripheral side of the signal writing / reading surface 1a of the writing / reading optical disc 1, a disc type indicating portion is formed, and a groove portion 2 serving as an uneven pattern portion is formed. The groove portion 2 is provided in a portion between the signal recording area on the signal recording layer and the chucking hole 1b. As shown in FIG. 2, this groove portion 2 is
The chucking hole 1b is formed so as to surround the recording track 4 over the entire circumference thereof.

When a light beam for reading an information signal such as the laser beam is applied, the groove portion 2 diffracts the light beam. Therefore, the reflected light flux of the light flux in the portion where the groove portion 2 is provided has a lower light intensity than the reflected light flux of the light flux in the portion where the groove portion 2 is not provided.

The read-only optical disc 5 is
As shown in FIG. 5, the disk substrate is made of a transparent material such as polycarbonate and has a diameter substantially the same as that of the disk substrate of the read / write optical disk 1. A chucking hole 5b similar to the chucking hole 1b of the write / read optical disk 1 is provided on the disk substrate so that the read-only optical disk 5 can be held by a recording and / or reproducing apparatus described later. Is drilled in the section.

Then, the read-only optical disc 5 is
The main surface portion on one side serves as a signal reading surface 5a.
The signal reading surface 5a is formed by depositing a signal recording layer made of a metal material on the other main surface of the disk substrate. The signal recording layer is formed by following the so-called signal pits, which are concaves and convexes corresponding to the information signals formed on the other main surface portion of the disk substrate by means of injection molding or the like. That is, the reading of the information signal from the signal recording layer is performed by the signal reading surface 5a.
Therefore, it is performed through the disk substrate.

To read an information signal from the signal recording layer of the read-only optical disc 5, a laser beam is focused and irradiated on the signal recording layer, and a reflected light flux of the laser beam by the signal recording layer is detected. By doing. On the signal recording layer, the laser beam causes a change in the amount of returning light due to a diffraction phenomenon according to the unevenness on the signal recording layer. Therefore, the information signal can be read by detecting the change in the light intensity of the reflected light flux.

In the signal recording layer of the read-only optical disc 5, a portion corresponding to the disc type indicator portion in which the groove portion 2 of the write / read optical disc 1 is formed,
That is, the peripheral portion of the chucking hole 5b is a disc type indicating portion, and has a flat mirror surface shape. That is, the reflected light flux of the light flux at the disc type indicator of the read-only optical disc 5 has a higher light intensity than the reflected light flux of the light flux at the disc type indicator of the write / read optical disc 1.

That is, the read / write optical disk 1 and the read-only optical disk 5 can be identified by the presence or absence of the groove 2. The presence or absence of the groove portion 2 can be determined by comparing the light intensities of the reflected light fluxes of the light fluxes in the disk type marking portions which are the peripheral portions of the chucking holes 1b and 5b.

The disc type indicating portion in the recording disc according to the present invention may be configured by providing a plurality of concave portions 3 as concave and convex pattern portions, instead of the groove portion 2 as shown in FIG. The concave portions 3 are provided at positions which are intermittent in the direction along the recording tracks 4 and in the direction orthogonal to the recording tracks 4, and are formed at positions so-called zigzag patterns.

Even in the disc type marking portion having such a structure, the reflected luminous flux of the luminous flux is weaker when the concave portion 3 is provided. That is, the read / write optical disk 1 and the read-only optical disk 5 can be identified by the presence or absence of the recess 3. The presence or absence of the concave portion 3 can be determined by comparing the light intensities of the reflected luminous fluxes of the luminous fluxes in the disc type marking portions which are the peripheral portions of the chucking holes 1b and 5b.

The recording and / or reproducing apparatus according to the present invention is configured to use the read / write optical disk 1 and the read-only optical disk 5 as recording media. As shown in FIG. 5, this recording and / or reproducing apparatus has a disc table 6 on which one of the read / write optical disc 1 and the read-only optical disc 5 is mounted. The disc table 6 is formed into a substantially disc shape, and a positioning protrusion provided at the center is inserted into the chucking holes 1b and 5b to position the read / write optical disc 1 or the read-only optical disc 5. Hold.

The disk table 6 can be rotated by a spindle motor 7.

In the recording and / or reproducing apparatus, the signal writing / reading surface 1a or the signal reading surface 5a of the read / write optical disk 1 or the read-only optical disk 5 mounted on the disk table 6 is also used.
An optical pickup device 8 is provided so as to face the. The optical pickup device 8 includes a writing / reading means for writing / reading an information signal to / from the read / write optical disk 1 or the read-only optical disk 5, a light beam irradiating means for irradiating the disk type indicating portion with a light beam, and Serves as a light flux detecting means for detecting the reflected light flux of the light flux from the disc type indicator.

The optical pickup device has a laser diode 9 as a light source, a photodetector 10 and an objective lens. The light beam emitted from the laser diode 9 is guided to various optical devices in the optical pickup device 8 (not shown), and the objective lens causes
The signal is recorded and irradiated onto the signal recording surface of the read / write optical disk 1 or the read-only optical disk 5.
This objective lens can be moved and operated by the objective lens driving device 11 in two directions of the optical axis direction and the direction orthogonal to the optical axis direction.

The light beam focused on the signal recording surface of the read / write optical disk 1 or the read-only optical disk 5 by the objective lens is reflected by the signal recording surface and is re-reflected to the objective lens as a reflected light beam. Incident. The photodetector 10 detects transition of the light intensity and the polarization direction of the reflected light flux. This photodetector 10
Outputs the transition of the light intensity and the polarization direction of the reflected light flux as an electric signal.

In the recording and / or reproducing apparatus, the magnetic head device is arranged so as to face the objective lens of the optical pickup device 8 via the read / write optical disk 1 or the read-only optical disk 5. 19 are provided. The magnetic head device 19 generates a magnetic field according to an information signal input through the magnetic field signal input terminal 22 in a recording mode described later, and applies the magnetic field to the signal recording layer of the read / write optical disk 1. That is, the information signal input through the magnetic field signal input terminal 22 is subjected to predetermined modulation processing by the encoder 21 and sent to the amplifier 20. The amplifier 20 supplies the magnetic head device 19 with a magnetic field generation current according to the information signal subjected to the modulation processing.

This magnetic head device is disposed close to the other main surface of the read / write optical disk 1 or the read-only optical disk 5, and is fed in the radial direction of the write / read optical disk 1 or the read-only optical disk 5. The optical pickup device 8 is moved and operated in synchronization with the operated optical pickup device 8, and is always positioned so as to face the objective lens.

In this recording and / or reproducing apparatus,
The spindle motor 7 is rotationally driven by a central processing unit (CPU) 16 whose rotational speed is controlled via an amplifier 18. Further, the laser diode 9 emits light whose emission output is controlled by the central processing unit 16 via the amplifier 17. In addition, this central processing unit
Based on the detection result of the reflected light flux in the photodetector 10 of the optical pickup device 8, it serves as identification means for identifying the disc type.

The electric signal output from the photodetector 10 is sent to the servo control circuit 13 via the amplifier 12.
It is sent to the output terminal 14 and the signal level determination circuit 15.

From the output terminal 14, the read / write optical disk 1 or the read-only optical disk 5 is used.
The read information signal is output.

The signal level discriminating circuit 15 discriminates the signal level of the electric signal sent from the photodetector 10 and sends the result to the central processing unit 16. The central processing unit 16 controls the objective lens driving device 11 via the servo control circuit 13 based on the signal level discrimination by the signal level discriminating circuit 15. The control of the objective lens driving device 11 is such that the focal point of the light flux by the objective lens is always positioned on the recording track 4 of the write / read optical disc 1 or the read-only optical disc 5, so-called focus. Servo and tracking servo.

In the recording and / or reproducing apparatus constructed as described above, it is discriminated whether the disc mounted on the disc table 6 is the read / write optical disc 1 or the read only optical disc 5. That is, in the identification mode for identifying the disc type, the central processing unit 16 first sets the optical pickup device 8 at a position facing the disc type indicating portion, that is, the read / write optical disc 1 or the read / write optical disc. It is sent to the innermost side of the dedicated optical disc 5. Then, the central processing unit 16 causes the laser diode 9 to emit a luminous flux having a constant light output. At this time, the read / write optical disk 1 or the read-only optical disk 5 may be rotated by the disk table 6 or may be stopped.

The amount of light of the luminous flux applied to the disc type marking portion returns to the optical pickup 8 side as a reflected luminous flux in the amount of light according to the state of the concavo-convex pattern portion of the disc type marking portion. Then, the reflected light flux is converted into an electric signal according to the light amount by the photodetector 10. The output signal of the photodetector 10 having a level corresponding to the light amount of the reflected light flux is sent to the signal level determination circuit 15. The signal level discriminating circuit 15 compares the electric signal with a predetermined reference level and sends the result of this comparison to the central processing unit 16. The central processing unit 16 identifies the disc type based on the result of comparison with the predetermined level of the electric signal sent from the signal level determination circuit 15.

The central processing unit 16 identifies the disc type, that is, whether the recording disc mounted on the disc table 6 is the read / write optical disc 1 or the read-only optical disc 5. Based on this, the light emission output of the laser diode 9, the rotation speed of the spindle motor 7, and the gain of the servo control circuit 13 are controlled.

The recording mode and reproduction mode described below are executed on the premise that such disc type identification is completed.

That is, in this recording and / or reproducing apparatus, in the recording mode in which the information signal is written to the write / read optical disc 1, the write / read optical disc 1 is rotated at a predetermined speed, The information signal is input to the magnetic field signal input terminal 22 and the laser diode 9 is caused to emit light at a constant high output. At this time, the information signal is written along the recording track 4 in the signal recording layer of the read / write optical disk 1.

In the reproducing mode in which information signals are read from the read / write optical disk 1 or the read-only optical disk 5 in the recording and / or reproducing apparatus, the write / read optical disk 1 or the read-only optical disk 5 is used. The laser diode 9 is rotated at a predetermined speed, and the laser diode 9 is caused to emit light at a predetermined constant output according to the disc type. At this time, the electric signal output from the photodetector 10 and sent to the output terminal 14 becomes a read signal of the information signal from the write / read optical disc 1 or the read-only optical disc 5.

The recording and / or reproducing apparatus according to the present invention is not limited to the structure using the so-called magnetic field modulation system as in the above-mentioned embodiment, but may be the structure using the so-called optical modulation system. In this case, in the recording mode, the read / write optical disk 1 is also used.
The information signal written to the laser diode 9 is sent to the laser diode 9 via the encoder 21 and the central processing unit 16. That is, in this case, the laser diode 9 is controlled so as to emit a light beam whose light intensity is modulated corresponding to the information signal. Further, in this optical modulation method, the magnetic field intensity generated by the magnetic head device 19 is of a predetermined constant intensity in the recording mode.

[0056]

As described above, the recording and / or recording according to the present invention
Or, in the reproducing apparatus, based on the detection result in the light flux detecting means for detecting the reflected light flux of the light flux from the medium type marking portion of the light flux irradiated to the medium type marking portion provided on the recording medium by the light flux radiating means. The identifying means identifies the medium type of the recording medium.

Therefore, in this recording and / or reproducing apparatus, it is not necessary to manually perform various switching operations according to the medium type of the recording medium. Further, the identification of the medium type in the recording and / or reproducing apparatus does not require mechanical discrimination such as shape discrimination, so that the configuration of the recording and / or reproducing apparatus is not complicated.

Further, in the recording disc according to the present invention, the disc type indicating portion provided on at least a part of the signal recording surface portion where the information signal can be written and / or read is provided with an uneven pattern depending on the disc type. Have a section.

Therefore, in this recording disc, the disc type of the recording disc can be identified by optically reading the disc type indicating portion, and the disc type can be identified without being rotated. Can be made

That is, the present invention can provide a recording and / or reproducing apparatus capable of identifying the medium type of a recording medium without complicating the structure.

Further, the present invention can provide a recording disk capable of indicating the disk type without changing the shape of the cartridge.

[Brief description of drawings]

FIG. 1 is a perspective view showing a configuration of a recording disk according to the present invention.

FIG. 2 is an enlarged plan view of an essential part showing the configuration of the essential part of the recording disk.

FIG. 3 is an enlarged plan view of an essential part showing another example of the configuration of the essential part of the recording disk.

FIG. 4 is a perspective view showing another example of the configuration of the recording disk.

FIG. 5 is a block diagram showing a configuration of a recording and / or reproducing apparatus according to the present invention.

[Explanation of symbols]

 1 ・ ・ ・ ・ ・ Optical disk for writing / reading 2 ・ ・ ・ ・ ・ ・ ・ ・ Groove 3 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Concave 5 ・ ・ ・ ・・ ・ ・ ・ ・ ・ ・ ・ Read-only optical disk ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Optical pickup device 9 ・ ・ ・ ・ ・ ・ ・ ・ ・ Laser diode 10 ・ ・ ・・ ・ ・ ・ ・ Photodetector 15 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Signal level discrimination circuit 16 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Central processing unit

Claims (2)

[Claims] 1. A writing and / or reading means for writing and / or reading an information signal to and from a recording medium, and a light flux irradiating means for irradiating a medium type indicator provided on the recording medium with a light flux. The light flux detecting means detects the reflected light flux of the light flux from the medium type indicator, and the identification means for identifying the medium type of the recording medium based on the detection result of the reflected light flux by the light flux detecting means. Recording and / or reproducing device. 2. A signal recording surface section capable of writing and / or reading an information signal, and a disc type indicating section provided on at least a part of the signal recording surface section, wherein the disc type indicating section is a disc type. A recording disk having a concave-convex pattern portion according to the above.