JPH05334677A - Recording medium processor and its processing method - Google Patents

Abstract

PURPOSE:To write information with the same irradiation light quantity without performing trial write on an optical disk used even once in every case in an optical disk device. CONSTITUTION:For example, the trial write is performed when the optical disk 1 is used for the first time, and a light quantity value for the optimum write on the optical disk 1 can be obtained. An obtained optimum light quantity value is registered on an EEPROM 70 with the control data of the optical disk 1. Hereinafter, the write of the information on the optical disk 1 is performed by controlling a laser control circuit 51 according to the optimum light quantity value stored in the EEPROM 70, and generating laser power with power in accordance with the optimum light quantity value from a laser diode 9.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording medium processing apparatus such as an optical disk apparatus for recording or reproducing information on an optical disk and a processing method thereof.

[0002]

2. Description of the Related Art As is well known, a recording medium, such as an optical disc, provided with information tracks (grooves) called spiral grooves in a spiral shape or a concentric shape is used to collect the information tracks or the information tracks by the light condensed by an objective lens. Writing (recording) or reading (reproduction) of information as a physical hole (pit), an area where the magnetic characteristics are changed, or an area where the metal state is changed between the information tracks. An optical disk device for performing the above has been put into practical use.

Now, in the case of an optical disk device for recording information by forming physical holes which are pits on the optical disk,
Normally, the control data pre-recorded on the optical disc is read, and the information to be recorded is written according to the characteristics of the disc written in the optical disc, that is, the light amount (optimum light amount value) at the time of writing information. ing.

However, as shown in FIG. 3, while changing the light quantity at the time of writing, for an optical disk in which the optimum light quantity value is not recorded, or for an optical disk in which information cannot be accurately written with the optimum light quantity value, as shown in FIG. The trial writing is repeated to determine the optimum light amount.

That is, information is written and read with a certain amount of light in areas other than the user's data writing area, and this is repeated to find the optimum amount of writing light on the disc, and actual writing is performed with the obtained amount of light. It is like this.

For this reason, conventionally, it takes time for the device to reach the ready state (writeable state).
There was a problem in that once the device became idle, trial writing had to be performed again even when the same disk was used.

[0007]

As described above, in the past, information was written on an optical disc on which the optimum light intensity value was not recorded, or on an optical disc on which information could not be accurately written with the optimum light intensity value. When performing, trial writing must be performed each time to determine the optimum light intensity value, and therefore, even if the same disc is used, the processing takes time and the operability is poor.

Therefore, an object of the present invention is to provide a recording medium processing apparatus and a processing method thereof, which can shorten the processing time when the same recording medium is used and improve the operability. There is.

[0009]

In order to achieve the above object, in the recording medium processing apparatus of the present invention, the recording medium on which the identification information of the recording medium is recorded is irradiated with light. The writing means for writing information, the first reading means for reading the information and the identification information written by the writing means, and the optimum light amount value for writing are calculated based on the information read by the reading means. Calculating means, storage means for storing the optimum light amount value obtained by the calculating means and the identification information read by the reading means in association with each other, and a second reading means for reading the identification information of the recording medium. Reading means for reading the optimum light quantity value stored in the storage means based on the identification information read by the second reading means, and the optimum light quantity value read by the reading means. Thus by controlling the irradiation light of the writing means, and a control means for performing writing of information to be recorded on the recording medium.

Further, in the recording medium processing method of the present invention, the optimum light amount value for writing information on the recording medium obtained by writing information on the recording medium by irradiation of light is set to the recording medium. When the new information is written to the recording medium, the writing is performed according to the optimum light amount value managed together with the identification information of the recording medium. It is configured to execute.

[0011]

According to the present invention, the above-described means makes it possible to eliminate the need for trial writing performed each time it is used for a recording medium on which trial writing has already been performed. It is possible to reduce the time required for processing when using.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a schematic configuration of an optical disk device according to the present invention.

That is, the optical disc 1 as a recording medium
The groove (recording track) formed in a spiral or concentric groove is provided on its surface. On this recording track, a plurality of sector marks (header information) are recorded in advance at predetermined intervals.

Here, the sector mark is composed of a combination of a plurality of physical holes (pits), and is an address as an address indicating an information recording area (user data area) following this, for example, a track number or a sector number. Is becoming

Further, the optical disc 1 is provided with a control information track in which control data is recorded separately from the user data area. The control data to be recorded on the control information track includes, for example, the serial number of the optical disc 1, the manufacturer name, and the reference value of the optimum light amount at the time of writing information. The optical disc 1 is rotated by the motor 2 at a constant speed, for example. And this motor 2 has a motor control circuit 1
Controlled by 8.

Recording / reproduction of information with respect to the optical disk 1 is performed by an optical head 3 provided below the optical disk 1. The optical head 3 is fixed to a drive coil 13 that constitutes a movable portion of a linear motor 31, and the drive coil 13 is a linear motor control circuit 17
It is connected to the.

A linear motor position detector 26 is connected to the linear motor control circuit 17, and the linear motor position detector 26 detects the scale value of the optical scale 25 provided on the optical head 3 from the linear motor position detector 26. A position signal is output.

A permanent magnet (not shown) is provided on the fixed portion of the linear motor 31, and the drive coil 13 is provided.
Is excited by the linear motor control circuit 17, the optical head 3 is moved in the radial direction of the optical disc 1 across the recording track.

The optical disc 1 uses a recording film for forming pits by punching, but a recording film utilizing phase change or a multi-layer recording film may be used. Further, other recording media such as a magneto-optical disk can be used, but in this case, the configuration of the optical head 3 or the like needs to be slightly changed.

An objective lens 6 is held on the optical head 3 by a wire or a leaf spring (not shown), and the objective lens 6 is driven by a drive coil 5 in the focusing direction (optical axis direction of the lens 6). The drive coil 4 is movable in the tracking direction (direction orthogonal to the optical axis of the lens 6).

The laser light generated by the laser diode 9 as the semiconductor laser oscillator driven by the laser control circuit 51, which will be described later, is generated by the collimator lens 1.
The optical disk 1 is irradiated with light through 1a, the half prism 11b, and the objective lens 6. The reflected light from the optical disk 1 is the objective lens 6 and the half prism 11.
b, the condenser lens 10a, and the cylindrical lens 1
It is guided to the photodetector 8 via 0b.

In the vicinity of the laser diode 9, a monitoring photodiode PD is provided as a light emission amount detecting device for detecting the light emission amount of the laser diode 9. The monitor current as a detection signal from the photodiode PD is supplied to the laser control circuit 51.

The photodetector 8 is composed of four-divided photodiodes 8a, 8b, 8c and 8d.
The cathode side of each of the photodiodes 8a, 8b, 8c, 8d is commonly provided with a preamplifier circuit 52 for video signals.
, And the anode side is connected to the focus / tracking processing circuit 40, respectively.

That is, a current flows from the cathode to the anode in the photodiodes 8a, 8b, 8c, 8d according to the reflected light from the optical disk 1, and the video signal processing is performed by using the sum current extracted from the cathode side. And the focusing (optical disk 1 and objective lens 6) is performed by using the respective currents extracted from the anode side.
And a tracking (following a guide groove previously recorded on the optical disc 1) process are performed.

The focus / tracking processing circuit 4
0 is amplifiers 12a, 12b, 12c, 12d, focusing control circuit 15, tracking control circuit 16, linear motor control circuit 17, adders 30a, 30b, 30.
c, 30d, and operational amplifier (differential amplifier) OP1,
It is composed of OP2.

That is, the output signal of the photodiode 8a of the photodetector 8 is added to the adder 30 via the amplifier 12a.
a and 30c, the output signal of the photodiode 8b is supplied to the adders 30b and 30d via the amplifier 12b, and the output signal of the photodiode 8c is supplied to the amplifier 12c.
Is supplied to the adders 30b and 30c via the output signal of the photodiode 8d via the amplifier 12d.
0a and 30d are supplied.

The output signal of the adder 30a is supplied to the inverting input terminal of the differential amplifier OP1, and this differential amplifier OP1 is supplied.
The output signal of the adder 30b is supplied to the non-inverting input terminal of. As a result, the differential amplifier OP1 supplies a tracking difference signal according to the difference between the adders 30a and 30b to the tracking control circuit 16.

The tracking control circuit 16 produces a track drive signal according to the track difference signal supplied from the differential amplifier OP1. The track drive signal output from the tracking control circuit 16 is supplied to the drive coil 4 in the tracking direction. Also,
The track difference signal used in the tracking control circuit 16 is also supplied to the linear motor control circuit 17.

The output signal of the adder 30c is supplied to the inverting input terminal of the differential amplifier OP2, and this differential amplifier OP2 is supplied.
The output signal of the adder 30d is supplied to the non-inverting input terminal of. As a result, the differential amplifier OP2 supplies the focusing control circuit 15 with a signal relating to the focus point corresponding to the difference between the adders 30c and 30d.

The output signal of the focusing control circuit 15 is supplied to the focusing drive coil 5 and is controlled so that the laser beam is always in perfect focus on the optical disc 1.

As described above, the sum current of the outputs from the photodiodes 8a to 8d of the photodetector 8 in the focusing / tracking state is the unevenness of the pits (recorded data) formed on the track. Is reflected.
Therefore, this sum current is converted into a voltage value by the preamplifier circuit 52 for the video signal and then supplied to the video signal processing circuit 19 to reproduce the recording data and the address data (track number, sector number, etc.). Be offered to.

The video signal processing circuit 19 binarizes the electric signal (voltage value) from the preamplifier circuit 52 and outputs it as a reproduction signal (video signal). The peak value of the electric signal from the preamplifier circuit 52 is output. And a recording area detection circuit 42 that outputs a recording area detection signal in response to an electric signal from the preamplifier circuit 52.

The laser control circuit 51 causes the laser diode 9 to generate a laser beam corresponding to the reproduction light amount in accordance with the switching signal from the CPU 23, and in the state where the reproduction light amount of the laser beam is generated, a recording operation described later is performed. The laser diode 9 is driven according to the data pulse (original signal) on the recording data supplied from the signal generating circuit 34, and the laser light having the recording light quantity corresponding to the optimum light quantity value for writing information on the optical disc 1 is generated. It is what makes them.
The laser control circuit 51 controls the output light amount (reproduction light amount) of the laser diode 9 by the monitor current from the photodiode PD.

In front of the laser control circuit 51, a recording signal generation circuit as a modulation circuit for modulating recording data supplied from an optical disk control device 33 as an external device via the interface circuit 32 into a pulsed data signal. 34 are provided.

The video signal processed by the video signal processing circuit 19 is demodulated by the interface circuit 32, subjected to error correction processing and the like, and then output to the optical disc control device 33.

The video signal from the video signal processing circuit 19 is output to the data clock generating circuit 35. The data clock generation circuit 35 includes an oscillation circuit 36.
And a PLL circuit 37. The PLL circuit 37 generates a data clock signal according to the master clock from the oscillation circuit 36 and the video signal from the video signal processing circuit 19, and outputs it to the video signal processing circuit 19. To do.

The D / A converter 22 includes a focusing control circuit 15, a tracking control circuit 16 and a tracking control circuit 16, respectively.
It is used for exchanging information between the linear motor control circuit 17 and the CPU 23.

Further, the tracking control circuit 16 is
The objective lens 6 is moved in accordance with the track jump signal supplied from the CPU 23 via the D / A converter 22, and the laser light is moved by one track.

Therefore, the laser control circuit 51, the focusing control circuit 15, the tracking control circuit 16,
The linear motor control circuit 17, the motor control circuit 18, the video signal processing circuit 19, the recording signal creation circuit 34, and the like are controlled by the CPU 23 via the bus line 20, and the CPU 23 is stored in the memory 24. A predetermined operation is performed by the executed program.

Further, the CPU 23 stores data relating to the optimum light amount value for the optical disc 1 to be used in EEPRO.
This EEPROM7 is managed while using M70.
According to the data stored in 0, the laser control circuit 51 is controlled to adjust the recording light quantity of the laser light at the time of writing information on the optical disk 1 to be reused.

That is, in the EEPROM 70, the control data read from the control information track of each optical disc 1 when the optical disc 1 is initially used,
The optimum light amount value for writing information (light emission amount of writing irradiation) obtained by actual trial writing on the optical disc 1 is stored in association with each other.

In the present embodiment, when the optical disc 1 is first used, trial writing is performed with the optimum light amount value (reference value) in the control data, and when the light amount value at that time is not satisfied, The optimum light amount value (light emission amount of writing irradiation) is obtained by repeating trial writing while gradually changing the light amount value, and the obtained optimum light amount value is stored together with the manufacturing number and the manufacturer name of the optical disk 1. ..

When the same optical disk 1 is reused, the optimum light quantity value corresponding to the manufacturing number and the manufacturer name in the control data is read from the EEPROM 70, and the laser light having the recording light quantity corresponding to the optimum light quantity value is read. It is designed to be generated by the laser diode 9. Next, the operation of the above configuration will be described. Figure 2
Shows the flow of processing for writing information.

For example, it is assumed that the optical disk 1 is set in the apparatus now. Then, the control data as identification information recorded on the control information track of the optical disc 1 is read.

At this time, the EEP is made by the serial number of the optical disk 1 in the read control data.
The content of the ROM 70 is searched, and it is checked whether or not the optimum light amount value for the optical disc 1 is stored in the EEPROM 70.

If the optimum light quantity value is not stored, that is, if this optical disk 1 is the first one to be used in this apparatus, the optimum light quantity reference in the control data for the predetermined track of the optical disk 1 is referred to. Trial writing is performed according to the value. Then, the optimum light emission amount for writing irradiation is determined depending on the writing state at that time.

The light emission amount of the writing irradiation thus determined is stored in the EEPROM 70 together with the manufacturing number and the manufacturer name of the optical disk 1 in the control data read from the control information track.

After that, the apparatus is set to the ready state and communication with the optical disk control apparatus 33 as the host is enabled, so that information is written to the optical disk 1. In this case, the writing of the information to be recorded is performed by the laser light generated by the laser diode 9 and having the recording light amount corresponding to the light emission amount of the writing irradiation.

In this way, for the optical disk 1 that is used for the first time, the actual optimum light amount value in this device is obtained by trial writing and registered in the EEPROM 70. Then, the above-mentioned writing of the information to be recorded is completed, and the optical disk 1 is pulled out from the device, whereby the device is set in the idle state.

In this idle state, a new writing process is performed on the same optical disk, that is, the optical disk 1 in which the optimum light quantity value (light emission quantity of writing irradiation obtained by trial writing) for the optical disk is already registered in the EEPROM 70. Is generated.

Then, in this case, the optical disc 1
The control data recorded on the control information track is read, and the EEPR is read based on the serial number.
The light emission amount of the writing irradiation for the optical disc 1 is read from the inside of the OM 70.

Then, the apparatus is brought into the ready state again, and the communication with the optical disk control apparatus 33 as the host is enabled, so that the laser control circuit 51 is operated in accordance with the light emission amount of the writing irradiation read from the EEPROM 70. Controlled, the information to be recorded is similarly written by the laser light having the power corresponding to the optimum recording light amount from the laser diode 9.

On the other hand, in the idle state, in the case of writing processing to another optical disc 1 which is not the same,
In the same manner as described above, trial writing is performed and the optimal light emission amount for writing irradiation on the optical disc 1 is determined.
Then, the light emission amount of this writing irradiation is the optical disc 1 concerned.
EEPR together with control data such as serial number
After being registered in the OM 70, the information to be recorded is written by the laser light of the recording light amount according to the light emission amount of the writing irradiation.

Similarly, the writing of information on the optical disk 1 will be performed by the laser light of the recording light amount according to the light emission amount of the writing irradiation written in the EEPROM 70. In this way, it is possible to write information to be recorded on the optical disc 1 that has been used even once, without performing trial writing each time. As described above, it is possible to eliminate the need for trial writing performed every time it is used for an optical disc on which trial writing has already been performed.

That is, the optimum light quantity value obtained by the trial writing for the first use of the optical disk is stored, and the information is written using the stored optimum light quantity value in the subsequent use of the optical disk. I am trying.
As a result, it is possible to always write with the optimum irradiation light amount without performing trial writing each time the optical disk is used. Therefore, when the same optical disc is reused, it is possible to shorten the time taken for the device to be in the ready state, and it is possible to realize an efficient operation.

Further, in this embodiment, since the trial writing is performed once to obtain the actual light emission amount of the writing irradiation, regardless of the optimum light amount reference value recorded on the optical disk, the characteristics of the device are obtained. This makes it possible to perform writing that is suitable for various writing conditions such as variation, environment, or environment. The present invention is not limited to the above embodiment,
Needless to say, various modifications can be made without departing from the spirit of the invention.

[0057]

As described above in detail, according to the present invention, it is possible to shorten the processing time when the same recording medium is used and to improve the operability, and the recording medium processing apparatus. A processing method can be provided.

[Brief description of drawings]

FIG. 1 is a block diagram showing a circuit configuration of an optical disk device according to an embodiment of the present invention.

FIG. 2 is a flowchart similarly shown for explaining the operation.

FIG. 3 is a diagram for explaining a conventional technique and its problems.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Optical disk (recording medium), 3 ... Optical head, 9 ... Laser diode, 15 ... Focusing control circuit, 16
... tracking control circuit, 19 ... video signal processing circuit,
23 ... CPU, 24 ... Memory, 33 ... Optical disk control device, 34 ... Recording signal creation circuit, 51 ... Laser control circuit,
70 ... EEPROM.

Claims (2)

[Claims] 1. A writing unit for writing information by irradiating light onto a recording medium on which identification information of the recording medium is recorded, and a first unit for reading the information and the identification information written by the writing unit. Reading means, calculating means for calculating an optimum light quantity value for writing based on the information read by the reading means, the optimum light quantity value obtained by the calculating means, and identification information read by the reading means And a second reading unit that reads the identification information of the recording medium; and the storage unit that stores the identification information read by the second reading unit. Reading means for reading the optimum light quantity value, and controlling the irradiation light of the writing means according to the optimum light quantity value read by the reading means to write information to be recorded on the recording medium. A recording medium processing device comprising: a control unit that executes the recording medium. 2. An optimum light amount value for writing information on the recording medium obtained by writing information on the recording medium by irradiation of light is managed together with the identification information recorded on the recording medium, A method of processing a recording medium, wherein when new information is written to the recording medium, the writing is executed according to the optimum light amount value managed together with the identification information of the recording medium.