JP2826108B2 - Optical recording / reproducing device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an optical recording / reproducing apparatus for recording, erasing, and reproducing information data on a recording medium using a light beam source such as a laser beam. More particularly, the present invention relates to an optical recording / reproducing apparatus capable of performing recording under optimum recording conditions.

[Conventional technology]

The optical recording / reproducing apparatus is provided with an optical head that irradiates a recording medium that performs rotation, linear motion, or the like with a light beam and generates an electric signal in accordance with light reflected from the recording medium.

When recording and erasing information data, the amount of energy of the light beam applied to the unit recording area of the information data on the recording medium is changed. That is, information data is recorded and erased by increasing the amount of light applied to the recording medium, locally increasing the temperature of a minute portion on the recording medium, and partially forming a mark. It has become.

Also, when reproducing the recorded information data,
Information data has been reproduced by converting a change in reflected light from the recording medium depending on the presence or absence of a mark formed on the recording medium into an electric signal.

[Problems to be solved by the invention]

If the size of the mark formed on the recording medium is too large, waveform interference due to the influence of marks adjacent to each other is likely to occur when reproducing information data. in this case,
The amount of jitter in the reproduction signal tends to increase, and the amplitude of the reproduction signal tends to decrease. Further, when the size of the mark formed on the recording medium is smaller than the resolution recognizable by the optical head, the amplitude of the reproduction signal also becomes small, and normal reproduction cannot be performed.

On the other hand, the size of the mark formed on the recording medium depends on the magnitude of the energy amount of the light beam applied to the unit recording area of the information data on the recording medium, the ambient environmental temperature,
In addition, the recording medium tends to fluctuate under the influence of the variation of the recording sensitivity in the recording medium.

For example, when the energy amount of the light beam is large, or when the surrounding environmental temperature is high, the temperature of a minute portion that locally rises in temperature on the recording medium due to the irradiation of the light beam becomes high and is formed. The size of the mark increases. Also, when the recording sensitivity of the recording medium is high, the size of the mark to be formed also becomes large.

Conversely, when the energy amount of the light beam is small, or when the ambient temperature is low,
The temperature of the minute portion that locally rises in temperature due to the light beam irradiation does not rise so much, and the size of the mark formed becomes small. Further, even when the recording sensitivity of the recording medium is low, the size of the formed mark is small.

As described above, the shape and size of the mark formed on the recording medium tend to fluctuate according to the surrounding environmental temperature, the variation in the recording sensitivity of the recording medium, and the like, and therefore, it is difficult to form a stable mark. However, there is a problem that it is difficult to improve the reliability in recording and erasing information data and to perform high-density recording on a recording medium.

Thus, for example, as disclosed in Japanese Patent Application Laid-Open No. 61-296529, an area for writing control is provided in each track on a recording medium, and every time information data is recorded or erased,
There has also been proposed one in which test recording and reproduction are performed to detect the optimum recording condition in the energy amount of the light beam so that an appropriate mark is formed.

However, if the optimum recording condition is detected each time information data is recorded or erased on each track, it takes a long time to record or erase the information data, and the processing speed of the information data decreases. Will cause problems.

[Means for solving the problem]

According to a first aspect of the present invention, there is provided an optical recording / reproducing apparatus which irradiates a recording medium with a light beam and generates an electric signal in response to light reflected from the recording medium. A recording head for recording and erasing information data by changing the amount of energy of a light beam applied to a unit recording area of information data on the recording medium to partially form a mark on the recording medium; In an optical recording / reproducing apparatus that reproduces information data in accordance with the presence or absence of a mark formed on a medium, test recording and reproduction are performed on a recording medium to detect and set an optimum recording condition in an energy amount of a light beam. Optimal recording condition detection setting means for recording information data from an external device immediately after turning on the power to the apparatus or immediately after changing the recording medium. It is characterized in that to detect the optimum recording conditions when subjected to deletion instruction.

According to another aspect of the present invention, there is provided an optical recording / reproducing apparatus that irradiates a recording medium with a light beam and generates an electric signal in response to light reflected from the recording medium. A recording head for recording and erasing information data by changing the amount of energy of a light beam applied to a unit recording area of information data on the recording medium to partially form a mark on the recording medium; In an optical recording / reproducing apparatus that reproduces information data in accordance with the presence or absence of a mark formed on a medium, test recording and reproduction are performed on a recording medium to detect and set an optimum recording condition in an energy amount of a light beam. An optimum recording condition detecting and setting means for detecting a temperature change of a predetermined value or more, and changing the optimum recording condition in the energy amount of the light beam by the temperature change. Temperature change detecting means for detecting the occurrence of a certain state, and when the temperature change detecting means detects the occurrence of a state that may change the optimum recording condition, the information is firstly transmitted to the recording medium. When recording and erasing of data are performed, a control means is provided for controlling the optimum recording condition detection setting means to detect and set a new optimum recording condition.

According to a third aspect of the present invention, there is provided an optical recording / reproducing apparatus which irradiates a recording medium with a light beam and generates an electric signal in response to light reflected from the recording medium. A recording head for recording and erasing information data by changing the amount of energy of a light beam applied to a unit recording area of information data on the recording medium to partially form a mark on the recording medium; In an optical recording / reproducing apparatus that reproduces information data according to the presence or absence of a mark formed on a medium, test recording and reproduction are performed for each block of a plurality of tracks on the recording medium to optimize the energy amount of the light beam. Optimum recording condition detection setting means for detecting and setting the recording condition, wherein the optimum recording condition detection setting means is a device for recording or erasing information data. Only for blocks belonging, test recording is characterized by performing the playback.

[Action]

According to the configuration of the first aspect, test recording and reproduction are performed by the optimum recording condition detection setting means,
The optimum recording condition of the energy amount of the light beam applied to the unit recording area of the information data on the recording medium is detected and set. Therefore, a mark of an appropriate size is always formed on the recording medium irrespective of the ambient environmental temperature, the variation in the recording sensitivity of the recording medium, and the like.

Further, the detection of the optimum recording condition by the optimum recording condition detection setting means is performed immediately after the power is turned on to the apparatus or immediately after the recording medium is exchanged, when the recording or erasing instruction of the information data is received from the external device. The optimum recording condition is not detected, and the number of times the optimum recording condition is detected is reduced as compared with the related art in which the optimum recording condition is detected every time information data is recorded or erased. Therefore, recording and erasing of information data does not take a long time, and the processing speed of information data does not decrease.

According to the configuration of the second aspect, similar to the optical recording / reproducing apparatus according to the first aspect of the invention, regardless of the surrounding environmental temperature, the variation in the recording sensitivity of the recording medium, and the like, the recording medium has:
A mark of an appropriate size is always formed.

Further, when the temperature change detecting means detects the occurrence of a temperature change exceeding a predetermined value, and detects the occurrence of a state that may change the optimum recording condition, thereafter, the recording of the information data on the recording medium is first performed. When erasing is performed, the optimum recording condition detection setting unit detects and sets a new optimum recording condition based on the control of the control unit. That is, when occurrence of a state that may change the optimum recording condition is not detected, test recording and reproduction are not performed by the optimum recording condition detection setting unit. Therefore, the time required for recording and erasing the information data can be further reduced, and the processing speed of the information data can be increased.

According to the third aspect of the present invention, similar to the optical recording / reproducing apparatus according to the first aspect of the present invention, regardless of the surrounding environmental temperature, the variation in the recording sensitivity of the recording medium, and the like,
A mark of an appropriate size is always formed.

Moreover, since the optimum recording condition in the energy amount of the light beam is detected and set for each block composed of a plurality of tracks on the recording medium, it is not necessary to provide a write control area for each track. The decrease in the effective data capacity of the medium can be kept small.

Further, when recording and erasing are performed on tracks belonging to the same block, detection and setting of optimum recording conditions are not performed for each track, so that recording and erasing of information data takes a long time. The processing speed of the information data does not decrease. Besides, trial record,
Since the area where the reproduction is performed and the area where the information data is recorded are in the same block, the moving of the optical head does not require a long time, and the recording and erasing operation can be performed in a shorter time.

〔Example〕

As one embodiment of the present invention, by changing the light amount of the light beam, the energy amount of the light beam applied to the unit recording area of the information data on the recording medium is changed to record and erase the information data on the recording medium. The following is a description of the optical recording / reproducing apparatus for performing the above, with reference to FIGS. 1 to 3.

As shown in FIG. 2, for example, a plurality of tracks 12 having concentric or spiral pregrooves are provided on an optical disc 11 as a recording medium. The tracks 12 are grouped into groups each having a predetermined number to form blocks 13. A total of N blocks 13 are formed.

An optical recording / reproducing apparatus 21 that performs recording and erasing of information data by partially forming marks on the optical disc 11 and reproduces information data according to the presence or absence of a mark formed on a recording medium. Is provided with an optical head 22, for example, as shown in FIG. This optical head 22
Is provided with a semiconductor laser as a light beam source, and emits a light beam to the optical disc 11;
And a light receiving unit 22b that receives the light reflected from the light source and generates an electric signal converted into, for example, a change in voltage.

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

The laser drive circuit 23 is connected to a recording light amount control unit 24 that controls the laser drive circuit 23 so that the light amount of the light beam during recording is optimized. A pseudo data generator 26 for generating a single-period bit string and a digital modulator 27 for digitally modulating information data sent from an external device are connected to the laser drive circuit 23 via a multiplexer 25. .

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 light source. This amplifier 31 is an amplifier 31
, And is connected to a waveform shaper 32 that outputs a digital signal after shaping the waveform of the signal. The waveform shaper 32 is connected to a digital demodulator 33 that digitally demodulates a signal output from the waveform shaper 32.

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 controls the operation of the optical recording / reproducing device 21 based on a command sent from an external device. Connected to 35. This processor 35 is provided for each block on the optical disc 11.
Test recording and reproduction are performed every 13..., And the optimum recording condition in the energy amount of the light beam is detected and set. When the occurrence of a state that may cause the recording is performed, when the recording and erasing of the information data is first performed for each of the blocks 13 on the optical disc 11, the detection and setting of the new optimum recording condition are performed. It acts as a control means for controlling the operation to be performed.

The processor 35 is further connected to state detection means 36 for detecting that a state that may change the optimum recording condition in the energy amount of the optical bit has occurred. As the state detecting means 36, for example, a timer for detecting that a predetermined time or more has elapsed, a temperature detecting device (temperature change detecting means) for detecting that a temperature change of not less than a predetermined value, or the like is used.

Further, the processor 35 is connected to the recording light amount control unit 24, and outputs a signal for controlling the recording light amount. The processor 35 further includes a multiplexer 25
Is also connected to the signal sent from the pseudo data generator 26,
Alternatively, one of the signals sent from the digital modulator 27 is switched and a switching signal for sending the signal to the laser drive circuit 23 is output.

The digital modulator 27, the digital demodulator 33, and the processor 35 are all connected to an interface 37 so that recording and reproduction data and commands are transmitted to and received from an external device.

The operation performed by the optical recording / reproducing apparatus 21 when recording, erasing, and reproducing information data on the optical disk 11 in the above configuration will be described below with reference to the flowchart shown in FIG.

First, it is determined whether or not the power has just been turned on (S
1) If not immediately after the power is turned on, shift to S2. In S2, it is determined whether or not the optical disk 11 has just been replaced, and if not, the process proceeds to S3. In S3, the state detection means 36 determines whether a predetermined time or more has elapsed or whether a temperature change of a predetermined value or more has been detected. If not, the process proceeds to S4.

In S4, it is determined whether a command instructing recording, erasing, or reproduction from the external device via the interface 37 has been received.If the command has not been received,
Return to S2. If a command has been received, the flow shifts to S5 to perform a normal recording, erasing, or reproducing process according to the command, and then returns to S2.

On the other hand, when it is determined in S1 that the optical disk 11 has just been turned on, or when it is determined in S2 that the optical disk 11 has just been replaced, the process proceeds to S6. Further, in S3, when it is determined by the state detecting means 36 that a predetermined time or more has elapsed or that a temperature change of a predetermined or more has been detected, that is, the optimum recording condition in the energy amount of the light beam, Also, when it is determined that a state that may change is generated, the process proceeds to S6.

In S6, similarly to the above S4, it is determined whether or not a command for 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 proceeds to S6 until the command is received. repeat.

If it is determined in S6 that the command has been received, the process proceeds to S7. In S7, it is determined whether or not the received command is a command for recording or erasing. In S7,
If it is determined that the received command is not a command instructing recording or erasing, the process proceeds to S8, and after performing a normal reproduction process according to the received command, returns to S6.

If it is determined in S7 that the received command is a command to instruct recording or erasing, the process proceeds 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 moved to the write control area in the block 13. After switching the multiplexer 25 so that the data output from the pseudo data generator 26 is input to the laser drive circuit 23, while changing the recording light amount by the recording light amount control unit 24, a test is performed on the write control area. Records,
A reproduction process is performed (S10).

The amplitude of the reproduced signal is detected by the amplitude detector 34, and an optimum recording light amount at which the amplitude becomes maximum, that is, an optimum recording state is detected and set (S11). Note that the value set here is not necessarily limited to the optimum recording light amount itself, and a difference from a preset optimum recording light amount may be obtained and set as a correction amount of the optimum recording light amount.

Through S9 to S11, the optimum recording condition determination processing for detecting and setting the optimum recording condition is performed.

When the optimum recording condition determination processing is completed, the data test-recorded in the write control area of the optical disk 11 is erased, and information data sent from an external device via the interface 37 and the digital modulator 27 is input to the laser drive circuit 23. Switches the multiplexer 25 so that the information data is recorded and erased on the optical disk 11.
The optical head 22 is moved to 12. When the optical head 22 moves, the write control area and the track 12 on which recording and erasing are performed are in the same block 13 and are close to each other, so that 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 and erasing is performed, the recording light amount control unit 24 controls the light amount of the light beam based on the detected and set optimal recording light amount while optimizing the light amount. Normal recording and erasing processing is performed (S12). When the recording and erasing processing is completed, the process returns to S2.
The same operation is repeated.

As described above, the light amount of the light beam at the time of recording is controlled so as to be an optimum light amount based on the test recording and reproduction. A mark of an appropriate size is always formed on the top.

Moreover, the optimal light beam amount is determined by the optical disk 11
Are detected and set for each block 13 composed of a plurality of tracks 12. Therefore, a write control area only needs to be provided for each of the blocks 13..., And a decrease in the effective data capacity of the optical disk 11 can be suppressed to a small value. In addition, since the detected optimum light amount only needs to be stored for each of the blocks 13.
The storage capacity of the processor 35 can be small.

Further, when recording and erasing are performed on the tracks 12 belonging to the same block 13, the detection and setting of the optimum light amount are not performed for each track 12. Therefore, recording and erasing of the information data does not take a long time, and the processing speed of the information data does not decrease.

Further, only when the state detecting means 36 detects the occurrence of a state that may change the optimal light amount, such as the passage of a predetermined time or more, or a temperature change of a predetermined value or more, thereafter, each state on the optical disc 11 is determined. block
When the recording and erasing of information data is performed for the first time, a new optimum light amount is detected and set, so that the time required for recording and erasing of information data can be further reduced.

In the present embodiment, an example in which the energy amount of the light beam applied to the unit recording area of the information data on the recording medium is changed by changing the recording light amount of the light beam has been described. For example,
By changing the irradiation time at the recording light amount of the light beam, the energy amount of the light beam irradiated to the unit recording area of the information data on the recording medium may be changed.

Further, the recording medium for recording information data is not limited to an optical disc provided with a plurality of concentric or spiral pre-groove tracks, for example, a linear track is provided on a square substrate. The same effect can be obtained by using an optical card or the like.

〔The invention's effect〕

The optical recording / reproducing apparatus according to the first aspect of the present invention includes an optical head that irradiates a recording medium with a light beam and generates an electric signal according to light reflected from the recording medium, as described above, By changing the energy amount of the light beam applied to the unit recording area of the information data on the recording medium,
In an optical recording / reproducing apparatus that performs recording and erasing of information data by partially forming a mark on a recording medium and reproduces information data in accordance with the presence or absence of a mark formed on the recording medium, Test recording and reproduction, and detects and sets an optimum recording condition in the energy amount of the light beam. The optimum recording condition detection setting unit is provided immediately after the power is turned on to the apparatus or when the recording is performed. Immediately after medium exchange, the optimum recording condition is detected when an information recording or erasing instruction is received from an external device.

As a result, a mark of an appropriate size is always formed on the recording medium irrespective of the ambient environmental temperature, the variation in the recording sensitivity of the recording medium, and the like.

Further, the detection of the optimum recording condition by the optimum recording condition detection setting means is performed immediately after the power is turned on to the apparatus or immediately after the recording medium is exchanged, when the recording or erasing instruction of the information data is received from the external device. The detection of the optimum recording condition is not performed. Therefore, recording and erasing of information data does not take a long time, and the processing speed of information data does not decrease.

Therefore, it is possible to form a stable mark by optimizing the recording conditions without lowering the processing speed of the information data, to improve the reliability in the recording of the information data, and to perform the high-density recording on the recording medium. It has the effect of being able to.

The optical recording / reproducing apparatus according to the second aspect of the present invention includes an optical head that irradiates a recording medium with a light beam and generates an electric signal according to light reflected from the recording medium, as described above, By changing the energy amount of the light beam applied to the unit recording area of the information data on the recording medium,
In an optical recording / reproducing apparatus that performs recording and erasing of information data by partially forming a mark on a recording medium and reproduces information data in accordance with the presence or absence of a mark formed on the recording medium, Test recording and reproduction to detect the optimum recording condition in the energy amount of the light beam, and to set and set an optimum recording condition detection and setting means, and to detect a temperature change equal to or more than a predetermined value, and to detect the energy of the light beam by the temperature change. Temperature change detection means for detecting that a state that may change the optimum recording condition in the amount has occurred, and when the occurrence of a state that may change the optimum recording condition has been detected by the temperature change detection means, When the information data is first recorded or erased on the recording medium, the above-mentioned optimum recording condition detection setting means is controlled to newly execute the recording. Detection of optimal recording condition, a configuration in which a control unit to perform setting.

As a result, similarly to the optical recording / reproducing apparatus according to the first aspect of the present invention, a stable mark is formed by optimizing the recording conditions, thereby improving the reliability in recording information data and increasing the density of the recording medium. In addition to performing recording, when the temperature change detecting unit does not detect the occurrence of a state that may change the optimum recording condition, the optimum recording condition detection setting unit performs test recording and reproduction based on the control of the control unit. Therefore, the recording and erasing time of the information data can be shortened, and the processing speed of the information data can be improved.

The optical recording / reproducing apparatus according to the third aspect of the present invention includes an optical head that irradiates a recording medium with a light beam and generates an electric signal according to light reflected from the recording medium, as described above, By changing the energy amount of the light beam applied to the unit recording area of the information data on the recording medium,
In an optical recording / reproducing apparatus that performs recording and erasing of information data by partially forming a mark on a recording medium and reproduces information data in accordance with the presence or absence of a mark formed on the recording medium, a plurality of recording media are used. Test recording and reproduction are performed for each block composed of the tracks, and the optimum recording condition in the energy amount of the light beam is detected and set, and the optimum recording condition detection setting means is provided. Test recording and reproduction are performed only for the block to which data is to be recorded or erased.

As a result, similarly to the optical recording / reproducing apparatus according to the first aspect of the present invention, a mark of an appropriate size is always formed on the recording medium irrespective of the ambient environmental temperature, the variation in the recording sensitivity of the recording medium, and the like. It is formed. In addition, since the optimum recording condition in the energy amount of the light beam is detected and set for each block composed of a plurality of tracks on the recording medium, a decrease in the effective data capacity of the recording medium can be suppressed.

Further, when recording and erasing are performed on tracks belonging to the same block, detection and setting of optimum recording conditions are not performed for each track, so that recording and erasing of information data takes a long time. In this case, the processing speed of the information data can be improved. In addition, since the area for performing test recording and reproduction and the area for recording information data are in the same block, the optical head does not need to be moved for a long time, and the recording / erasing operation can be performed in a shorter time. be able to.

That is, without reducing the effective data capacity of the recording medium and the processing speed of the information data, the recording conditions can be optimized to form a stable mark, and the reliability in the recording of the information data can be improved. There is an effect that high-density recording on a recording medium can be performed.

[Brief description of the drawings]

1 to 3 show one embodiment of the present invention. FIG. 1 is a block diagram showing a configuration of an optical recording / reproducing apparatus, FIG. 2 is a partial plan view showing a configuration of an optical disk, and FIG. 3
FIG. 5 is a flowchart showing an operation performed in the optical recording / reproducing apparatus. 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 (optimal recording condition detection setting means, control means), and 36 is a state detection means. .

──────────────────────────────────────────────────続 き Continuation of front page (72) Inventor Toshihisa Exit 22-22, Nagaikecho, Abeno-ku, Osaka-shi, Osaka Inside Sharp Corporation (56) References JP-A-61-165825 (JP, A) JP-A-60- 83234 (JP, A) JP-A-63-271735 (JP, A) JP-A-63-121130 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) G11B 7/00 G11B 7 / 125

Claims (3)

(57) [Claims] 1. A method for irradiating a recording medium with a light beam,
An optical head that generates an electric signal in accordance with light reflected from the recording medium is provided, and the energy amount of a light beam applied to a unit recording area of information data on the recording medium is changed to partially mark the recording medium. In an optical recording / reproducing apparatus that performs recording and erasing of information data by forming a mark, and reproduces information data according to the presence or absence of a mark formed on the recording medium, test recording and reproduction are performed on the recording medium. And an optimum recording condition detection setting means for detecting and setting an optimum recording condition in the energy amount of the light beam, wherein the optimum recording condition detection setting means is connected to an external device immediately after turning on the power to the apparatus or immediately after changing the recording medium. An optical recording / reproducing apparatus for detecting an optimum recording condition when receiving an instruction for recording or erasing information data. 2. A method for irradiating a recording medium with a light beam,
An optical head that generates an electric signal in accordance with light reflected from the recording medium is provided, and the energy amount of a light beam applied to a unit recording area of information data on the recording medium is changed to partially mark the recording medium. In an optical recording / reproducing apparatus that performs recording and erasing of information data by forming a mark, and reproduces information data according to the presence or absence of a mark formed on the recording medium, test recording and reproduction are performed on the recording medium. Means for detecting and setting the optimum recording condition in the energy amount of the light beam, and detecting a temperature change exceeding a predetermined value, and changing the optimum recording condition in the energy amount of the light beam by the temperature change. Temperature change detecting means for detecting occurrence of a state which may cause the recording, and changing the optimum recording condition by the temperature change detecting means. By the time occurrence of states of which is detected, then,
Control means for controlling the optimum recording condition detection setting means to detect and set a new optimum recording condition when information data is first recorded and erased on the recording medium. An optical recording / reproducing apparatus characterized by the following. 3. A method for irradiating a recording medium with a light beam,
An optical head that generates an electric signal in accordance with light reflected from the recording medium is provided, and the energy amount of a light beam applied to a unit recording area of information data on the recording medium is changed to partially mark the recording medium. In the optical recording / reproducing apparatus which performs recording and erasing of information data by forming a mark, and reproduces information data in accordance with the presence or absence of a mark formed on the recording medium, the optical recording / reproducing apparatus comprises: , Test recording and reproduction, and detecting and setting an optimum recording condition in the energy amount of the light beam. The optimum recording condition detection setting unit is configured to record or erase information data. Only for the block to which the object belongs,
An optical recording / reproducing apparatus for performing test recording and reproduction.