JP2587406B2 - Optical disk drive - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Overview] The present invention provides a mark for designating whether a data recording or reproducing method is a single hole method or a long hole method in a preformat portion of an optical disk medium, and a detection circuit for identifying the mark. And a single-hole / long-hole recording / reproducing circuit that can be selectively used based on the identification signal.

[Industrial applications]

The present invention relates to a method in which an optical disk medium on which data has already been written in a lower model (single hole method) can be reproduced in a higher model (long hole method).

[Conventional technology]

There are two conventional recording methods for optical disk media: a single hole recording method and a long hole recording method. The single-hole recording method is a method in which a peak of a hole written in single-hole recording has information, and is also called a change point recording method. In the long hole recording method, both ends of a hole written in the long hole recording have information.

FIG. 3 is an explanatory view of a conventional recording or reproducing method. In the figure, (a) is an example of a bit sequence of actual recording on an optical disk medium, and a recording bit and a reproduction waveform corresponding to this bit sequence are respectively represented by (b) a long hole method,
(C) Shown for each single hole system.

Reference numeral 1 denotes a track formed by a pregroove, 2 denotes a recording bit recorded on the track 1 by a long hole recording method, and an arrow W denotes a rotation direction of the optical disk medium. Numeral 3 indicates a reproduction waveform of the long hole method in which the recording bit 2 is reproduced. That is, this is a recording or reproducing method in which a change point of the reproduced waveform 3 corresponds to "1" of the actual recording bit string shown in FIG.

Reference numeral 4 denotes a recording bit recorded on the track 1 by the single-hole recording method corresponding to the bit string of the actual recording shown in FIG. In other words, this is a recording or reproducing method in which the presence or absence of the recording bit 4 corresponds to "1" and "0" of the actual recording bit string shown in FIG.

The long hole method doubles the recording density compared to the single hole method,
Although it has the advantage of being able to improve the information transfer speed, the single hole method has been used until now, and the reason that the long hole method is not used is that the baseline shift of the optical disk medium is large, On the contrary, the recording density could not be improved.

However, recently, a new technology for solving the shift problem has been developed.

[Problems to be solved by the present invention]

Conventionally, since the recording circuit and the reproducing circuit are different between the single-hole method and the long-hole method for the recording or reproducing method, they are regarded as different models, respectively, and the optical disk medium uses a dedicated optical disk device corresponding to the recorded method. There was an inevitable drawback.

Optical disk media is promising as a permanent storage medium, and high-performance optical disk devices that use the long-hole method will surely spread in the future by solving the shift problem as described above. The medium and the newly created slotted optical disk medium come to coexist.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional drawbacks and the current state of technological innovation, and has as its object to provide an optical disk device capable of using both a single-hole system and a long-hole system.

[Means for solving the problem]

The present invention relates to a mark detection circuit for identifying a mark on an optical disk medium provided with a mark for specifying whether a data recording / reproducing method is a single hole method or a long hole method in a preformat portion of each sector, and the mark detection circuit. And a recording data conversion circuit and a reproduction circuit for single hole and long hole which can be selected by the output of.

[Action]

As shown in FIG. 1, a long hole or single hole identification mark 7-1 provided in the preformat unit 7 can be easily implemented in a conventional preformat formation stage, and a mark detection circuit 9 for reading the mark is also provided. The identification signal can be easily obtained by adding to the conventional preformat section readout circuit.

The identification signal is latched and the output of the single-hole reproducing circuit 10 or the long-hole reproducing circuit 11 is output to the AND circuit 12- as shown in FIG.
The reproduction data P2 corresponding to the recording system is output from the OR circuit 13-1, which is selected by 1, 12-2.

In the case of recording, the latched identification signal output from the mark detection circuit 9 and the output of the single hole recording data conversion circuit 14 or the long hole recording data conversion circuit 15 for converting the input recording data Q1 are input to the AND circuit 12. The recording data corresponding to the recording method pre-formatted on the optical disk medium is output from the OR circuit 13-2 selected by -3 and 12-4, and recorded by this recording data.

〔Example〕

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In addition,
To facilitate understanding of the description of the configuration and operation, the same portions are denoted by the same reference numerals throughout the drawings, and redundant description will be omitted.

FIG. 1 shows marks of an optical disk medium preformat section according to the present invention. In the figure, the optical disk medium is used by dividing one track around the track into a plurality of sectors 6. Each sector 6 is composed of a pre-format section 7 and a data section 8, and the pre-format section 7 has a data section recording method. Mark to identify single hole type or long hole type
7-1 and address information 7-2 indicating the storage position of the data section 8.

The mark 7-1 records a code such as 1011 in the case of the single hole method and 0110 in the case of the long hole method. Such recording can be easily performed at the stage of preformat processing.

FIG. 2 shows a block diagram of an embodiment of the present invention. In the figure, a mark detection circuit 9 identifies a reproduction signal P1 output from an optical head (not shown) as a single-hole system or a long-hole system, and latches each identification signal for a required time to obtain a logical value "1". Is output, and AND circuit 12-
Input to 1,12-3, and AND circuit 12-2,12-
Input to 4 to form a selection circuit.

The reproduction signal P1 is input to the mark detection circuit 9 and also to the single-hole reproduction circuit 10 and the long-hole reproduction circuit 11 in parallel. The output of the single-hole reproduction circuit 10 is supplied to the AND circuit 12-1. The output of the hole reproducing circuit 11 is input to the AND circuit 12-2.

As a result of this connection, the AND circuit on the side where the latch signal "1" for outputting whether the mark detection circuit 9 is a single hole or a long hole by discrimination is selected and output as the reproduction data P2 via the OR circuit 13-1. You.

The recording data Q1 input to the optical disk device is input to the single-hole recording data conversion circuit 14 and the long-hole recording data conversion circuit 15 in parallel, and each output is an AND circuit.
Input to 12-3 and 12-4.

As a result of this connection, the AND circuit on the side where the latch signal "1" for outputting whether the mark detection circuit 9 is a single hole or a long hole by discrimination is selected, and is not shown as recording data Q2 via the OR circuit 13-2. Input to the recording circuit.

As described above, the discrimination signal output from the mark detection circuit 9 is latched and used as a selection signal of a reproduction circuit / recording data conversion circuit for a single hole or a long hole, thereby realizing an optical disk device for both a single hole and a long hole. I do.

(Effect of the present invention)

As described above in detail, according to the optical disk device of the present invention, the optical disk medium to be used can be made compatible and the versatility of the optical disk device is improved.

In addition, even when a single hole recording method and a long hole recording method are mixed in one medium, there is an effect that recording / reproduction can be performed by the apparatus of the present invention.

[Brief description of the drawings]

FIG. 1 is a mark of an optical disk medium preformat section of the present invention, FIG. 2 is a block diagram of an embodiment of the present invention, and FIG. In the figure, 1 is a track, 6 is a sector, 7 is a preformat section, 7-1 is a mark, 7-2 is address information, 9 is a mark detection circuit, 10 is a single hole reproduction circuit, and 11 is a long hole reproduction. Reference numeral 14 denotes a single-hole recording data conversion circuit, and 15 denotes a long-hole recording data conversion circuit.

Claims (1)

(57) [Claims] 1. A mark detecting circuit for identifying a mark on an optical disk medium having a mark for designating whether a data recording or reproducing method is a single hole method or a long hole method in a preformat portion of each sector, and a mark detecting circuit. An optical disc device provided with a single-hole and long-hole recording data conversion circuit and a reproduction circuit which can be selected by an output of a circuit.