JPH025221A - Optical recording and reproducing device - Google Patents

Abstract

PURPOSE:To always from a mark of a proper size on a recording medium regardless of the ambient temperatures, the variance of recording sensitivity of the recording medium, etc., by using an optimum recording condition detecting and setting means to perform the trial recording and reproducing actions. CONSTITUTION:A processor 35 functions as an optimum recording condition detecting and setting means which performs the trial recording a reproducing actions for respective block 13... of an optical disk 11 and detects and sets the optimum recording conditions for the energy value of the light beam. When a state detecting means 36 detects the fear of change of the optimum recording conditions, the processor 35 serves as a control means which performs the control to detect and sets the new optimum recording conditions when the information data is recorded and erased at first to respective block 13.... Thus a mark of a proper size is always formed on a recording medium regardless of the ambient temperatures, the variance of recording sensitivity of the recording medium, etc.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an optical recording and reproducing device that records, erases, and reproduces information data on a recording medium using a light beam source such as a laser beam. In particular, the present invention relates to an optical recording/reproducing apparatus that can perform recording under optimal recording conditions.

[Prior Art] An optical recording/reproducing device is equipped with an optical head that irradiates a light beam onto a recording medium that performs rotation or linear motion, and generates an electrical signal in response to the light reflected from the recording medium. There is.

When recording or erasing information data, the amount of energy of the light beam irradiated onto a unit recording area of information data on the recording medium is changed. In other words, information data is recorded and erased by increasing the amount of light irradiated onto the recording medium and locally raising the temperature of minute portions on the recording medium to form marks locally. It has become.

Furthermore, when reproducing recorded information data, the information data is reproduced by converting changes in reflected light from the recording medium that occur depending on the presence or absence of marks formed on the recording medium into electrical signals. It was like that.

[Problem to be solved by the invention]

If the size of the marks formed on the recording medium is too large, waveform interference due to the shadows of adjacent marks tends to occur during reproduction of information data. in this case,
The amount of jitter in the reproduced signal tends to increase, and the amplitude of the reproduced signal tends to decrease. Furthermore, if the size of the mark formed on the recording medium is smaller than the resolution that can be identified by the optical head, the amplitude of the reproduction signal will also become small, making it impossible to perform normal reproduction.

On the other hand, the size of the mark formed on the recording medium depends on the amount of energy of the light beam irradiated to the unit recording area of information data on the recording medium, the surrounding environmental temperature, and the recording sensitivity of the recording medium. It tends to fluctuate due to the influence of dispersion, etc.

For example, when the energy content of the light beam is large or when the surrounding environment temperature is high,
The temperature of the minute portion that locally increases due to the irradiation with the light beam increases, and the size of the mark formed increases. Further, even if the recording sensitivity of the recording medium is high, the size of the mark formed will still be large.

On the other hand, when the energy amount of the light beam is small or the surrounding environment temperature is low, the temperature of the minute portion of the recording medium that locally increases due to irradiation with the light beam may not be very high. , the size of the mark formed becomes smaller.Also, when the recording sensitivity of the recording medium is low,
The size of the marks formed is small.

In this way, the shape and size of marks formed on a recording medium tend to fluctuate depending on factors such as the surrounding environmental temperature and the recording sensitivity of the recording medium, making it difficult to form stable marks. However, there have been problems in that it is difficult to improve reliability in recording and erasing information data and to record at high density on a recording medium.

Therefore, as disclosed in Japanese Patent Application Laid-open No. 61-296529, a write control area is provided in each track on the recording medium, and trial recording and playback are performed each time information data is recorded or erased. There is also a QX system that detects the optimal recording conditions for the energy amount of the light beam and forms appropriate marks.

However, if each track on a recording medium is provided with an area for write control, it becomes impossible to record information data in a considerable amount of recording area, resulting in a significant reduction in the effective data capacity of the recording medium. . In addition, if the optimal recording conditions are detected each time information data is recorded or erased on each track, it will take a long time to record or erase information data, and the processing speed of information data will decrease. It will cause problems.

[Means to solve the problem]

In order to solve the above-mentioned problem, the optical recording and reproducing apparatus according to the invention of claim 1 uses a light beam that irradiates a recording medium with a light beam and generates an electrical signal in response to the light reflected from the recording medium. It records and erases information data by forming marks partially on the recording medium by changing the amount of energy of a light beam irradiated onto a unit recording area of information data on the recording medium. In an optical recording and reproducing device that reproduces information data depending on the presence or absence of marks formed on the medium, trial recording and reproduction is performed for each block consisting of multiple tracks on the recording medium, and the optimum energy amount of the light beam is determined. The present invention is characterized in that it includes an optimum recording condition detection and setting means that detects and sets recording conditions.

In order to solve the above problem, the optical recording and reproducing apparatus according to the invention of claim 2 uses a light beam that irradiates a recording medium with a light beam and generates an electric signal according to the light reflected from the recording medium. It records and erases information data by forming marks partially on the recording medium by changing the amount of energy of a light beam irradiated onto a unit recording area of information data on the recording medium. In an optical recording and reproducing device that reproduces information data depending on the presence or absence of marks formed on the medium, trial recording and reproduction is performed for each block consisting of multiple tracks on the recording medium, and the optimum energy amount of the light beam is determined. Optimum recording condition detection and setting means detects and sets recording conditions; state detection means detects occurrence of a state that may change the optimal recording conditions in the energy amount of the light beam; and state detection means detects and sets the optimal recording conditions. When the occurrence of a condition that is likely to change the conditions is detected, the optimum recording condition detection and setting means is then controlled when information data is first recorded or erased for each block on the recording medium. Detection of new optimal recording conditions,
The present invention is characterized by comprising a control means for making settings.

[Function] According to the structure of claim 1, the optimum recording condition detection and setting means performs trial recording and reproduction, thereby increasing the energy of the light beam irradiated onto the unit recording area of information data on the recording medium. Optimal recording conditions for the amount are detected and set. Therefore, a mark of an appropriate size is always formed on the recording medium, regardless of the surrounding environmental temperature or variations in recording sensitivity of the recording medium.

Moreover, the optimal recording conditions for the energy amount of the light beam are detected and set for each block of multiple tracks on the recording medium, so there is no need to provide a writing control area for each track, so recording Decrease in the effective data capacity of the medium can be kept to a small level.

Also, recording to tracks belonging to the same block,
When erasing, the optimum recording conditions are not detected and set for each track, so it does not take a long time to record or erase information data, and the processing speed of information data does not decrease. There isn't.

According to the structure of claim 2, similar to the optical recording and reproducing apparatus according to the invention of claim 1, the recording medium can be recorded on the recording medium regardless of the surrounding environmental temperature or the variation in recording sensitivity of the recording medium. A mark of an appropriate size is always formed, and furthermore, a decrease in the effective data capacity of the recording medium can be suppressed to a small level.

Also, recording to tracks belonging to the same block,
When erasing, the optimum recording conditions are not detected and set for each track, and furthermore, the condition detection means detects whether the optimum recording conditions have been detected, for example, if more than a predetermined amount of time has elapsed or if the temperature has changed more than a predetermined value. When the occurrence of a state that may change the recording conditions is detected, then when information data is first recorded or erased in each block on the recording medium, based on the control of the control means, The optimal recording condition detection and setting means detects and sets new optimal recording conditions. That is, when the occurrence of a condition that may change the optimum recording condition is not detected, the optimum recording condition detection and setting means does not perform trial recording or reproduction. Therefore, it is possible to shorten the time required for recording and erasing information data on the second layer, and increase the processing speed of information data.

〔Example〕

As an embodiment of the present invention, by changing the light intensity of the light beam, the energy amount of the light beam irradiated to a unit recording area of information data on a recording medium is changed,
An optical recording/reproducing apparatus for recording and erasing information data on a recording medium will be described below with reference to FIGS. 1 to 3.

As shown in FIG. 2, for example, an optical disc 11, which is a recording medium, is provided with a plurality of tracks 12 each having pre-groups formed concentrically or spirally. These tracks 12... form blocks 13... in groups of a predetermined number, and a total of N
The blocks 13... are configured.

An optical recording and reproducing device 21 records and erases information data by partially forming marks on the optical disk 11, and reproduces information data depending on the presence or absence of marks formed on the recording medium. For example, as shown in FIG. 1, an optical head 22 is provided. The optical head 22 includes a semiconductor laser as a light beam source, a light emitting part 22a that irradiates the optical disc 11 with a light beam, and a light emitting part 22a that receives light reflected from the optical disc 11 and generates electricity converted into a voltage change, etc. The light receiving section 22b generates a signal.

A laser drive circuit 23 for driving a semiconductor laser is connected to the optical head 22. This laser drive circuit 2
3 is a unit recording area of information data on the optical disc 11 by changing the amount of light beam emitted from the optical head 22 based on information data sent from a pseudo data generator 26 or a digital modulator 27, which will be described later. By changing the amount of energy of the light beam irradiated to the optical disc 11, a mark is formed on the optical disc 11 only when the logical value of the information data is 1, for example.

The laser drive circuit 23 is connected to a recording light amount control section 24 that controls the laser drive circuit 23 so that the light amount of the light beam during recording is optimized. Laser drive circuit 2
3 is also connected via a multiplexer 25 to a pseudo data generator 26 that generates a single-period bit string, and a digital modulator 27 that digitally modulates information data sent from an external device.

On the other hand, in the optical head 22, the light receiving section 22b is connected to an amplifier 31 that amplifies an electric signal generated in response to light reflected from the optical disk 11.
It is connected to a waveform shaper 32 that shapes the waveform of the signal output from the amplifier 31, binarizes it, and outputs a digital signal. The waveform shaper 32 includes a digital demodulator 33 that digitally demodulates the signal output from the waveform shaper 32.
It is connected to the.

The amplifier 31 is also connected to an amplitude detector 34 that detects the magnitude of the amplitude of the reproduced signal, and the amplitude detector 34 detects the amplitude of the optical recording/reproducing apparatus 1 based on a command sent from an external device.
It is connected to a processor 35 that controls the operation of Z21. This processor 35 performs trial recording and reproduction for each block 13 on the optical disc 11, detects and sets the optimum recording condition for the energy amount of the light beam, and acts as an optimum recording condition detection and setting means. When the occurrence of a condition that may change the optimum recording conditions is detected by the condition detection means 36 (to be described later), the recording and erasing of information data is first performed for each block 13 on the optical disk 11. When the new optimum recording condition is detected and set, it functions as a control means.

The processor 35 is further connected to a state detection means 36 for detecting the occurrence of a state that may change the optimum recording conditions in terms of the amount of energy of the light beam. As the state detection means 36, for example, a timer that detects that a predetermined amount of time or more has passed, a temperature detection device that detects that a temperature change that is more than a predetermined amount, or the like is used.

Further, the processor 35 is connected to the recording light amount control section 24 and outputs a signal for controlling the recording light amount. The processor 35 is further connected to the multiplexer 25 and generates a switching signal for switching either the signal sent from the pseudo data generator 26 or the signal sent from the digital modulator 27 and sending it to the laser drive circuit 23. It is designed to output .

The digital modulator 27, digital demodulator 33, and processor 35 are all connected to an interface 37 so that recording and reproduction data and commands can be sent and received to and from external devices.

In the above configuration, operations performed by the optical recording/reproducing device 21 when recording, erasing, and reproducing information data on the optical disc 11 will be described below based on the flowchart shown in FIG. 3.

First, check whether the power has just been turned on or not (Sl)
, if it is not immediately after the power is turned on, the process moves to S2.

In S2, it is determined whether the optical disc 11 has just been replaced, and if it is not, the process moves to S3. In S3, it is determined by the state detection means 36 whether a predetermined period of time or more has elapsed or a temperature change of a predetermined value or more has been detected, and if it has not been detected, S
Move to 4.

In S4, it is determined whether a command instructing recording, erasing, or reproduction has been received from the external device via the interface 37, and if no command has been received, the process returns to S2. Also, if the command has been received, S
After proceeding to step 5 and performing normal recording, erasing, or reproducing processing according to the command, the process returns to step S2.

On the other hand, when it is determined in S1 that the power has just been turned on, or when it is determined that the optical disk 11 has just been replaced in S2, the S
Move to 6. Further, in S3, when the state detection means 36 determines that a predetermined period of time or more has elapsed or that a temperature change of a predetermined value or more has been detected,
That is, even when it is determined that a state that is likely to change the optimal recording conditions regarding the energy amount of the light beam has occurred, the process moves to S6.

In S6, similarly to S4 above, it is determined whether a command instructing recording, erasing, or playback has been received from an external device via the interface 37, and if the command has not been received, 36 is continued until the command is received. repeat.

If it is determined in S6 that a command has been received, the process moves to 37. In S7, it is determined whether the received command is a command for recording or erasing. S
If it is determined in step 7 that the received command is not a command for recording or erasing, the process moves to S8, and after performing normal playback processing according to the received command,
Return to S6.

Further, if it is determined in S7 that the received command is a command instructing recording or erasing, the process moves to S9.

In S9, the block 13 to which the track 12 to be recorded or erased on the optical disk 11 belongs is determined, and the optical head 22 is placed in the old control area of the block 13.
move. After switching the multiplexer 25 so that the data output from the pseudo data generator 26 is input to the laser drive circuit 23, the recording light amount control unit 24 changes the recording light amount and performs a test on the write control area. Recording and playback processing is performed (310).

The amplitude of the reproduced signal is detected by the amplitude detector 34, and the optimal recording light amount at which the amplitude becomes maximum, that is, the recording state becomes optimal, is detected and set (Sll). Note that the value to be set here is not necessarily limited to the optimum recording light quantity itself, but may also be a difference from a preset optimum recording light quantity and set as a correction star for the optimum recording light quantity.

Optimum recording condition determination processing for detecting and setting optimal recording conditions is performed through steps 89 to Sll.

When the optimum recording condition determination process is completed, the data recorded on a trial basis in the write control area of the optical disc 11 is erased, and the information data sent from the external device via the interface 37 and the digital modulator 27 is input to the laser drive circuit 23. The multiplexer 25 is switched so that the optical head 22 is moved to the track 12 on the optical disc 11 where information data is recorded and erased. When moving the optical head 22, the write control area and the track 12 for recording and erasing are in the same block 13 and are close to each other, so it does not take a long time to move the optical head 22. . When the optical head 22 moves to the track 12 on which recording or erasing is to be performed, the recording light amount control section 24 controls the light beam (■) to be optimal based on the detected and set optimum recording light amount. , normal recording and erasing processing is performed (S12). When the recording and erasing processing is completed, the process returns to step 32, and the same operation is repeated thereafter.

In this way, the light intensity of the light beam during recording is controlled to be the optimum light intensity based on trial recording and playback, so regardless of the surrounding environmental temperature or variations in the recording sensitivity of the recording medium, A mark of an appropriate size is always formed on the top.

Moreover, the above-mentioned optimum amount of light beam is
Block 1 consisting of a plurality of tracks 12...
It is detected and set every 3... Therefore, it is only necessary to provide a write control area for each block 13, so that a decrease in the effective data capacity of the optical disc 11 can be suppressed to a small extent. Furthermore, since the detected optimum light amount only needs to be stored for each block 13, the storage capacity of the processor 35 can also be small.

Also, tracks 12 belonging to the same block 13...
When recording and erasing on tracks 12...
・The optimum light amount is not detected or set for each time.

Therefore, it does not take a long time to record or erase information data, and the processing speed of information data does not decrease.

Further, only when the state detection means 36 detects the occurrence of a state that may change the optimum light amount, such as the passage of time exceeding a predetermined value or the temperature change exceeding a predetermined value, When information data is recorded or erased for the first time in block 13..., a new optimal light amount is detected and set, so that the time required for recording or erasing information data on the - layer can be shortened. I can do it.

Note that in this embodiment, an example has been described in which the amount of energy of the light beam irradiated to a unit recording area of information data on the recording medium is changed by changing the recording light amount of the light beam, but the present invention is not limited to this. For example, the amount of energy of the light beam irradiated onto a unit recording area of information data on the recording medium may be changed by changing the irradiation time with the recording light amount of the light beam.

Furthermore, the recording medium on which information data is recorded is not limited to an optical disk having a plurality of tracks in which pre-groups are formed concentrically or spirally;
A similar effect can be obtained with an optical card or the like in which linear tracks are provided on a rectangular substrate.

[Effects of the Invention] As described above, the optical recording and reproducing device according to the invention of claim 1 irradiates a recording medium with a light beam and generates an electric signal in response to the light reflected from the recording medium. It is equipped with an optical head and records and erases information data by changing the energy amount of a light beam irradiated to a unit recording area of information data on the recording medium to partially form marks on the recording medium, In an optical recording and reproducing device that reproduces information data depending on the presence or absence of marks formed on a recording medium, test recording and reproduction are performed for each block of multiple tracks on the recording medium to determine the energy content of the light beam. This configuration includes an optimal recording condition detection and setting means that detects and sets the optimal recording condition.

As a result, a mark of an appropriate size is always formed on the recording medium, regardless of the surrounding environmental temperature or variations in the recording sensitivity of the recording medium.

Moreover, since the optimum recording condition for the energy amount of the light beam is detected and set for each block of a plurality of tracks on the recording medium, a decrease in the effective data capacity of the recording medium can be suppressed to a small extent.

Furthermore, when recording to tracks belonging to the same block, the optimal recording conditions are not detected and set each time, so the time for recording and erasing information data can be shortened. The processing speed of information data can be improved.

Therefore, without reducing the effective data capacity of the recording medium or the processing speed of information data, the recording conditions can be optimized to form stable marks, improving reliability in recording information data, and improving the reliability of the recording medium. This has the effect that high-density recording can be performed.

As described above, the optical recording and reproducing apparatus according to the invention of claim 2 includes an optical head that irradiates a recording medium with a light beam and generates an electric signal in accordance with the light reflected from the recording medium, Information data is recorded and erased by partially forming marks on the recording medium by changing the amount of energy of a light beam irradiated onto a unit recording area of information data on the recording medium. In an optical recording and reproducing device that reproduces information data depending on the presence or absence of marks, trial recording and reproduction are performed for each block consisting of multiple tracks on a recording medium, and the optimal recording conditions for the energy amount of the light beam are detected. and an optimum recording condition detection and setting means to set, a state detection means to detect the occurrence of a state that may change the optimum recording condition in the energy amount of the light beam, and a state detection means to change the optimum recording condition. When the occurrence of a potential condition is detected, the information data is first recorded for each block on the recording medium.
The configuration includes a control means for controlling the optimum recording condition detection and setting means to detect and set a new optimum recording condition when erasing is performed.

As a result, similar to the optical recording and reproducing apparatus according to the invention of claim 1, recording conditions can be optimized to form stable marks without reducing the effective data capacity of the recording medium, and reliability in recording information data can be achieved. In addition to improving the quality and performing high-density recording on the recording medium, when the state detection means does not detect the occurrence of a state that may change the optimum recording conditions, based on the control of the control means, Since the optimum recording condition detection and setting means does not perform trial recording or reproduction, the time required for recording and erasing information data can be shortened, and the processing speed of information data can be improved.

[Brief explanation of the drawing]

1 to 3 show an embodiment of the present invention, in which FIG. 1 is a block diagram showing the configuration of an optical recording/reproducing device, FIG. 2 is a partial plan view showing the configuration of an optical disc, and FIG. FIG. 3 is a flowchart showing the operations performed by the optical recording/reproducing device. 11 is an optical disk (recording medium), 12 is a track, 13
is a block, 21 is an optical recording/reproducing device, 22 is an optical head,
35 is a processor (optimum recording condition detection and setting means, control means), and 36 is a state detection means.

Claims (1)

[Claims] 1. An optical head that irradiates a recording medium with a light beam and generates an electrical signal in response to the light reflected from the recording medium, and irradiates a unit recording area of information data on the recording medium. Information data is recorded and erased by changing the energy amount of the light beam to partially form marks on the recording medium, and the information data is reproduced depending on the presence or absence of marks formed on the recording medium. The optical recording and reproducing apparatus includes an optimum recording condition detection and setting means for detecting and setting the optimum recording condition for the energy amount of the light beam by performing trial recording and reproduction for each block consisting of a plurality of tracks on the recording medium. An optical recording/reproducing device characterized by: 2. Equipped with an optical head that irradiates a recording medium with a light beam and generates an electric signal according to the light reflected from the recording medium, and the amount of energy of the light beam that irradiates a unit recording area of information data on the recording medium. In an optical recording and reproducing device that records and erases information data by partially forming marks on a recording medium by changing the . an optimum recording condition detection and setting means for detecting and setting an optimum recording condition for the energy amount of the light beam by performing trial recording and playback for each block consisting of a plurality of tracks on the recording medium; a state detection means for detecting the occurrence of a state that may change the optimum recording conditions; control means for controlling the optimum recording condition detection and setting means to detect and set new optimum recording conditions when information data is first recorded or erased in the block; Features of optical recording and reproducing device.