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US 5,517,471 AGranted
Method and apparatus for verifying recording data and for determining recording error using a detected light amount
AssigneeCanon Kabushiki Kaisha
InventorsTakaaki Ashinuma, Takatoshi Suzuki, Masakuni Yamamoto
Life of this patent
Estimating the term…
Abstract
A light beam is applied to an information recording medium to record information. A light amount of the light beam reflected by the recording medium is detected simultaneously with the recording of information. A defect of the recording medium is detected by comparing the detected light amount with a reference value. When a degree of the detected defect exceeds a predetermined level, the information is rerecorded on another portion of the recording medium.
Claims16
A method of judging recording comprising the steps of:
- recording data onto a recording medium;
- counting the number of data errors in a predetermined number of interleaves, determined by comparison determining means, simultaneously with the recording;
- counting the number of errors on the recording medium in the predetermined number of interleaves, detected by defect detecting means;
- judging whether or not the recording quality is good on the basis of a combination of (i) the number of data errors determined by the comparison determining means and (ii) the number of errors detected by the defect detecting means, in the predetermined number of interleaves;
- and
- setting a plurality of verifying determination reference values for comparison and determination of data and a plurality of verifying determination reference values for detection of defects, even if a result of a comparison and determination of data exceeds a first determination reference value, and wherein if a verifying determination for a detection of defects does not exceed a second determination reference value, the recording is judged as being good, and if the result of comparison and determination of data exceeds a third determination reference value, larger than the first determination reference value, or the verifying determination result for detection of defects exceeds a fourth determination reference value, larger than the second determination reference value, the recording is judged as being not good.
3 more elements
A method of judging recording comprising the steps of:
- recording data onto a recording medium;
- counting the number of data errors in a predetermined number of interleaves, determined by comparison determining means, simultaneously with the recording;
- counting the number of errors on the recording medium in the predetermined number of interleaves, detected by defect detecting means:
- judging whether or not the recording quality is good on the basis of a combination of (i) the number of data errors determined by the comparison determining means and (ii) the number of errors detected by the defect detecting means, in the predetermined number of interleaves;
- and
- setting a plurality of verifying determination reference values for comparison and determination of data and a plurality of verifying determination reference values for detection of defects, even if a result of a comparison and determination of data does not exceed a first determination reference value, and wherein if a verifying determination for detection of defects exceeds a second determination reference value, the recording is judged as being not good.
3 more elements
A method of judging recording comprising the steps of:
- recording data onto a recording medium;
- counting the number of data errors in a predetermined number of interleaves, determined by comparison determining means, simultaneously with the recording;
- counting the number of errors on the recording medium in the predetermined number of interleaves, detected by defect detecting means;
- counting the number of errors in a synchronous signal in predetermined number of sectors;
- judging whether or not the recording quality is good on the basis of a combination of (i) the number of errors determined by the comparison determining means in the predetermined number of interleaves, (ii) the number of errors detected by the defect detecting means in the predetermined number of interleaves and (iii) the number of errors of the synchronous signal in the predetermined number of sectors;
- and
- setting a plurality of verifying determination reference values for comparison and determination of data and a plurality of verifying determination reference values for detection of defects, even if a result of a comparison and determination of data exceeds a first determination reference value, and wherein if a verifying determination for detection of defects does not exceed a second determination reference value, the recording is judged as being good, and if the result of comparison and determination of data exceeds a third determination reference value, larger than the first determination reference value, or the verifying determination result for detection of defects exceeds a fourth determination reference value, larger than the second determination reference value, the recording is judged as being not good.
4 more elements
A method of judging recording comprising the steps of:
- recording data onto a recording medium;
- counting the number of data errors in a predetermined number of interleaves, determined by comparison determining means, simultaneously with the recording;
- counting the number of errors on the recording medium in the predetermined number of interleaves, detected by defect detecting means;
- counting the number of errors in a synchronous signal in a predetermined number of sectors;
- judging whether or not the recording quality is good on the basis of a combination of (i) the number of errors determined by the comparison determining means in the predetermined number of interleaves, (ii) the number of errors detected by the defect detecting means in the predetermined number of interleaves and (iii) the number of errors of the synchronous signal in the predetermined number of sectors;
- and
- setting a plurality of verifying determination reference values for comparison and determination of data and a plurality of verifying determination reference values for detection of defects, even if a result of a comparison and determination of data does not exceed a first determination reference value, and wherein if a verifying determination for detection of defects exceeds a second determination reference value, the recording is judged as being not good.
4 more elements
A data recording apparatus comprising:
- recording means for recording data onto a recording medium;
- first count means for counting the number of data errors in a predetermined number of interleaved, determined by comparison determining means, simultaneously with the recording by said recording means;
- second count means for counting the number of errors on the recording medium in the predetermined number of interleaves, detected by defect detecting means;
- judging means for judging whether or not the recording quality is good on the basis of a combination of (i) the number of errors determined by the comparison determining means and (ii) the number of errors detected by the defect detecting means, in the predetermined number of interleaves;
- and
- means for setting a plurality of verifying determination reference values for comparison and determination of data and a plurality of verifying determination reference values for detection of defects, even if a result of a comparison and determination of data exceeds a first determination reference value, and wherein if a verifying determination for detection of defects does not exceed a second determination reference value, the recording is judged as being good, and if the result of comparison and determination of data exceeds a third determination reference value, larger than the first determination reference value, or the verifying determination result for detection of defects exceeds a fourth determination reference value, larger than the second determination reference value, the recording is judged as being not good.
3 more elements
A data recording apparatus comprising:
- recording means for recording data onto a recording medium;
- first count means for counting the number of data errors in a predetermined number of interleaves, determined by comparison determining means, simultaneously with the recording by said recording means;
- second count means for counting the number of errors on the recording medium in the predetermined number of interleaves, detected by defect detecting means;
- judging means for judging whether or not the recording quality is good on the basis of a combination of (i) the number of errors determined by the comparison determining means and (ii) the number of errors detected by the defect detecting means, in the predetermined number of interleaves;
- and
- means for setting a plurality of verifying determination reference values for comparison and determination of data and a plurality of verifying determination reference values for detection of defects, even if a result of comparison and determination of data does not exceed a first determination reference value, and wherein if a verifying determination for detection of defects exceeds a second determination reference value, the recording is judged as being not good.
3 more elements
A data recording apparatus comprising:
- recording means for recording data onto a recording medium;
- first count means for counting the number of data errors in a predetermined number of interleaves, determined by comparison determining means, simultaneously with the recording by said recording means;
- second count means for counting the number of errors on the recording medium in the predetermined number of interleaves, detected by defect detecting means;
- third count means for counting the number of errors of a synchronous signal in a predetermined number of sectors;
- judging means for judging whether or not the recording quality is good on the basis of a combination of (i) the number of errors determined by the comparison determining means in the predetermined number of interleaves, (ii) the number of errors detected by the defect detecting means in the predetermined number of interleaves and (ii) the number of errors of the synchronous signal in the predetermined number of sectors;
- and
- means for setting a plurality of verifying determination reference values for comparison and determination of data and a plurality of verifying determination reference values for detection of defects, even if a result of comparison and determination of data exceeds a first determination reference value, and wherein if a verifying determination for detection of defects does not exceed a second determination reference value, the recording is judged as being good, and if the result of comparison and determination of data exceeds a third determination reference value, larger than the first determination reference value, or the verifying determination result for detection of defects exceeds a fourth determination reference value, larger than the second determination reference value, the recording is judged as being not good.
4 more elements
A data recording apparatus comprising:
- recording means for recording data onto a recording medium;
- first count means for counting the number of data errors in a predetermined number of interleaves, determined by comparison determining means, simultaneously with the recording by said recording means;
- second count means for counting the number of errors on the recording medium in the predetermined number of interleaves, detected by defect detecting means;
- third count means for counting the number of errors of a synchronous signal in a predetermined number of sectors;
- judging means for judging whether or not the recording quality is good on the basis of a combination of (i) the number of errors determined by the comparison determining means in the predetermined number of interleaves, (ii) the number of errors detected by the defect detecting means in the predetermined number of interleaves and (iii) the number of errors of the synchronous signal in the predetermined number of sectors;
- and
- means for setting a plurality of verifying determination reference values for comparison and determination of data and a plurality of verifying determination reference values for detection of defects, even if a result of a comparison and determination of data does not exceed a first determination reference value, and wherein if a verifying determination for detection of defects exceeds a second determination reference value, the recording is judged as being not good.
4 more elements
Dependencies are inferred from the claim text.