JPH0346131A - Optical disk controller - Google Patents

Abstract

PURPOSE:To always optimumly record data to a recording medium by comparing optimum data with recording data and recording the recording data with recording power for which the number of errors is smallest. CONSTITUTION:A CPU 8 stores the recording data in a storing circuit 9 and outputs a control signal (l) so that the data can berecorded with certain recording power. A recording and output circuit 6 receiving this signal injects a current (i) for recording to a semiconductor laser 4 and records the data in the recording medium. A reproducing and output circuit 5, next, receiving a control signal (k) from the CPU 8 injects a current (h) for reproducing to the laser 4 and outputs an output beam (f). A reflected beam (a) from the recording medium is converted to a reproducing data signal (b) in a photodiode 1 and continuously converted to reproducing data (c) in a data reproducing circuit 2. The CPU 8 counts a dissident part between recorded data (d), which are stored in a data comparator circuit 3, and the reproducing data (c). This count value is the number of errors. Then, the CPU 8 records the recording data to the recording medium again with the recording power for which the number of errors is smallest.

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to an optical disk control device for an erasable optical disk device, and in particular to controlling the output of a semiconductor laser when recording data on a recording medium. The optical disc control device is capable of optimizing the length and width of data (portions where magnetization is reversed or the crystalline state is changed) recorded on the recording medium.

[Prior Art] In an erasable optical disc device, a light beam is used for recording, reproducing, and erasing information. Specifically, this light beam is converged into a very small spot using an optical lens, and information is recorded by changing the crystalline state (crystalline and amorphous) of the recording medium or reversing its magnetization using the optical energy. There is.

In an erasable optical disk device, a recording output circuit determines the optical energy of a light beam, and receives a recording signal with a predetermined pulse width corresponding to this recorded information (Fig. 2 (a)), and outputs this recorded information. The signal is output from the laser beam (Figure 2 (
b)) and irradiates the recording medium onto the recording medium to record information on the recording medium.

On the other hand, information reproduction utilizes the difference in reflectance due to phase change between crystalline and amorphous recording media, or the Kerr effect.

That is, a light beam reflected from a recording medium is received using a light receiving element and converted into an electric signal to obtain a reproduced data signal. Conventionally, the intensity of a light beam (recording power) when recording data on a recording medium has been determined to a certain value based on data obtained using an average recording medium.

However, even if data is recorded on the recording medium with a constant recording power in this way, changes in the external environment and various conditions of the recording medium may cause the data "1" (magnetization reversal) recorded on the recording medium to change. The length and width of the portion (where the crystalline state has changed) changes, and as a result, the waveform of the reproduced data signal obtained when data is reproduced is greatly affected.

For example, if the data "1" on the recording medium is as shown in FIG. 2 (■), the reproduced data signal will be as shown in FIG. 3 (n). With such a signal, there are no factors that reduce the reliability of the reproduced data, and highly reliable reproduced data can be obtained.

However, even with the same recording power, the data "l" on the recording medium may become as shown in FIG.
The signal will be as shown in 1). In this case, since the position of data "l", that is, the position indicating the peak value, cannot be clearly determined, the reliability of the reproduced data becomes low.

Furthermore, under different circumstances, the data on the recording medium ``1''
” may become as shown in Figure 2 (V), and the reproduced data signal accordingly becomes a signal as shown in Figure 3 (■). In this case, the amplitude value and peak value become low. Therefore, there is a possibility that the data "l" cannot be identified.

Therefore, data 19111 as shown in FIG. 2 (■) can be recorded on a recording medium under certain conditions, but if the conditions change, the data 19111 on the recording medium
'' may end up on the side of Figure 2 (m) or Figure 2 (■).

[Problems to be solved] In the conventional optical disk control device described above, the recording power is set to a constant value before data is recorded, so the external environment (7 grades, humidity difference) and various conditions of the recording medium change. There is a problem in that the recording power may not be optimal depending on changes in various conditions, such as when the recording power is changed, and data cannot be optimally recorded on the recording medium.

The present invention has been made in view of the above problems, and it is an object of the present invention to provide an optical disc control device that can always optimally record data on a recording medium even if various conditions change.

[a! Solution to the Problem] In order to achieve the above object, an optical disc control device of the present invention includes a recording output unit capable of changing a recording output when recording data on the optical disc, in an optical disc control device that controls an optical disc device; a storage means for recording reference data for adjusting the recording output; a data comparison means for comparing the data reproduced from the optical disc with the reference data stored by the recording means to detect a discrepancy; and the storage. While changing the recording output in the output means, the reference data stored in the storage means is recorded on the optical disk, and the data comparison means detects a discrepancy, and the optimal recording output is determined from the recording output and the discrepancy. This configuration includes a control means for controlling the recording output of the recording output means.

[Example code] Hereinafter, the present invention will be explained in detail based on the drawings.

FIG. 1 is a block diagram of an optical disc control device according to an embodiment of the present invention.

In the figure, 1 is a photodiode that photoelectrically converts the emitted light beam, 2 is a data reproducing circuit that reproduces data from the electrical signal of the photodiode 1, and 3 is a data comparison that compares the data of the data reproducing circuit 2 with reference data. circuit, 4
5 is a semiconductor laser that outputs a light beam; 5 is a reproduction output circuit that drives the semiconductor laser 4 during reproduction; 6 is a recording output circuit that drives the semiconductor laser 4 during recording; and 7 is an erase output circuit that drives the semiconductor laser 4 during erasing. , 8 is a control circuit (hereinafter referred to as CPU), and 9 is a storage circuit for temporarily storing reference data.

In the above configuration, information to be recorded (standard data) (n)
is manually input to the CPU 8, the CPU 8 causes the storage circuit 9 to store the recording data corresponding to the information (n), and instructs the recording output circuit 6 to record it on the recording medium with a certain recording power Pwl. Outputs control number 8 (1). The recording output circuit 6 injects a recording current (1) into the semiconductor laser 4 according to a manually inputted control signal (1), thereby recording data on the recording medium using the output beam (f) of the semiconductor laser.

Next, the CPU 8 outputs a control signal (1) to stop the operation of the recording output circuit 6 in order to read the recorded data, and outputs a control signal (k) to operate the reproduction output circuit 5. Then, the reproduction output port "ai5 injects a reproduction current (h) into the semiconductor laser 4, and the semiconductor laser 4 outputs an output beam (f) with reproduction power. The reflected beam (a) reflected from the recording medium ) is converted into a reproduced data signal (b) by the photodiode l, and the reproduced data signal (b) is converted by the data reproducing circuit 2 into reproduced data (c).

Thereafter, the CPU 8 compares the data patterns of the recorded data (d) and the reproduced data (C) stored in the data comparison circuit 3, and counts the mismatched portions between the recorded data (d) and the reproduced data (C).

After storing the counted number (number of errors) Erl and the recording power Pwl set during recording, the CPU 8 outputs a control signal (m) and erases the data previously recorded by the erasing circuit 7 at the recording power Pwl onto the recording medium. Erase from above.

The above-mentioned process is performed at recording powers Pwl, Pw2. Pw3...
The CPU 8 can understand the relationship between the recording power Pw and the number of errors Er by repeating the process using several parameters such as . Therefore, the CPU 8 can find the recording power Pw when the number of errors Er is the smallest within this relationship.

Then, the CPU 8 uses the found recording power PW to record the recording data onto the recording medium again.

It should be noted that the present invention is not limited to the above embodiments, but includes various modifications within the scope of the gist. For example, in the above-described embodiment, the above process is repeated for each recorded data, but it is also possible to repeat the above process at predetermined time intervals, or to perform it when the apparatus is started up.

[Effects of the Invention] As explained above, the present invention records data on a recording medium by using the recording power when the number of errors is the least when comparing optimal data and recorded data. An optical disk control device that can optimize the length and width of the recorded data portion (the portion where magnetization is reversed or the crystalline state is changed) and improve the reliability of the reproduced information. It has the effect of being able to provide

[Brief explanation of drawings]

Fig. 1 is a block diagram of an optical disc O1 device according to an embodiment of the present invention, Fig. 2 is a timing chart during writing in the optical disc device and a diagram showing changes on the recording medium, and Fig. 3 is a diagram showing the state of change on the recording medium. 2 is a timing chart showing data. 5: Reproduction output circuit 6: Recording output circuit 7: Erase output circuit 8: Control circuit 9: Memory circuit

Claims (1)

[Claims] In an optical disk control device that controls an optical disk device that records and erases data by irradiating a light beam onto a predetermined position on an optical disk and also receives reflected light of the light beam and reproduces data, a recording output means that can change the recording output when recording;
a storage means for recording reference data for adjusting the recording output; a data comparison means for comparing the data reproduced from the optical disc with the reference data stored by the recording means to detect a discrepancy; and the storage. While changing the recording output in the output means, the reference data stored in the storage means is recorded on the optical disk, and the data comparison means detects a discrepancy, and the optimal recording output is determined from the recording output and the discrepancy. 1. An optical disc control device comprising: control means for controlling the recording output of the recording output means.