Optical disk recording and retrieving device

Details Optical disk recording and retrieving device Optical disk recording and retrieving device

2000-08-24

2001-06-12

Hindi, Nabil (Department: 2651)

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

C369S047500, C369S047530

Reexamination Certificate

active

06246661

ABSTRACT:

FIELD OF THE INVENTION
The present invention is related to an information recording and retrieval device that records and retrieves information to and from a recording medium. More precisely, the present invention relates to a recording and retrieving device that is capable of very precisely setting the optimum recording power used in thermal recording.
BACKGROUND OF THE INVENTION
A conventional method of setting the optimum recording power is disclosed in an unexamined patent publication JP 7-73468, published Mar. 17, 1995. This publication discloses a control method for minimizing the difference between a peak level obtained from the amplitude of a retrieved signal of an isolated mark pattern and a peak level obtained from the amplitude of a retrieved signal of a repeated mark pattern. Thus, this method, referred to as “test write record control” is realized by setting an optimum recording power by recording predetermined data on an optical disk and retrieving the recorded data.
SUMMARY OF THE INVENTION
The above-mentioned prior art method suffers problems that the present invention solves. For example, in the prior art, no consideration is paid to the differences in the recording and retrieving conditions of the magnetic media which have different recording sensitivities at similar recording densities and similar linear velocities. As a result, given the increase or decrease of recording power with the deviation of the recording sensitivity, the power scan range in the test write process does not function well. Also, the quality of the recording medium can be deteriorated by recording with excessive power depending upon the kind of recording medium being used.
As object of the present invention is to suppress the deviation of the recording mark as much as possible in order to form a highly precise recording mark and to improve the reliability of the information.
Another object of the present invention is to give proper consideration to the differences in the recording and retrieving conditions of the magnetic media which have different recording sensitivities at similar recording densities and similar linear velocities.
Yet another object of the present invention is to improve the reliability of the recording and retrieving device by suppressing changes in the characteristics of the recording medium, which can result from recording with too much power. This also extends the life of the light source.
Still another object of the present invention is to cope with the wide deviation of recording power due to the deviation of the recording sensitivity caused by the deviation of the thickness of the recording medium and the deviation of the environmental temperature.
In order to achieve the above-mentioned objects of the present invention, as well as other objects not specifically mentioned, the conformance of the recording, retrieving and erasing device to the recording medium is improved by judging the kind of the recording medium at the change of the recording medium and setting the recording and retrieving condition so that it conforms to that kind of recording medium. The deviation of the recording sensitivity of the recording medium by the deviation of the environmental temperature is suppressed by recording test write data with different levels of recording power at a predetermined position of the recording medium. The optimum recording power is determined based upon output signals that correspond to the different levels of recording power and is obtained from a retrieved signal of the recorded test write data. Then, recording and retrieval of regular information is carried out.
Furthermore, in the test write process over the power scan range is divided into the several processes. Thus, when deciding the optimum recording power based upon the data (V) obtained from the retrieved signal of the test write data of each power scan, the range of a subsequent power scan is set based upon the value (V). As a result, recording with excessive power during the test write process is prevented.
Additionally, in the test write process, the optimum recording power can always be found by recording the test write data starting at a low power in the range of recording power. This way, excessive power is not radiated to the recording medium and the output of the light source is kept to a minimum thereby extending the life of the light source.
Still further, the processing time for the test write process is reduced and transfer rate is improved by changing the output coefficient of the laser driver and carrying out the test write process by increasing or decreasing the output recording power for realizing the test write process under a wide deviation of the recording power for media of different recording sensitivities at similar recording densities and linear velocities, as well as accommodating environmental temperature deviations.
These and other objects, features and advantages of the present invention will become more apparent in view of the following detailed description of the present invention in conjunction with the Drawings.


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