JP2728206B2 - Information recording / reproducing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to an information recording / reproducing apparatus, and particularly to an information recording / reproducing apparatus using a non-erasable information recording medium.

<Prior Art> The present applicant recorded on an information recording medium for the purpose of avoiding overwriting on the information recording medium and further shortening the reproduction time in an information recording apparatus using a non-erasable information recording medium. Japanese Patent Application No. 62-035898 has proposed a method of recording a mark indicating whether or not there is an error in information at a predetermined position on the information recording medium.

That is, according to this, after information is recorded on the information recording medium, the recorded information is reproduced and an error check is performed. If there is no error, for example, a mark (V mark) indicating no error is placed at a predetermined position. It should be noted that the V mark is detected during reproduction, and if there is no V mark, V
The reproduction of the data corresponding to the mark is not performed, and the process proceeds to the next information track, and the V mark is similarly searched. When there is a V mark, reproduction of data following the V mark is executed. In this way, when a plurality of information tracks are continuously reproduced, the time required for the reproduction is reduced.

<Problems to be Solved by the Invention> However, data following the above-described technical V mark is reproduced and seek to a target information track is performed while collating some address information included in the data.
Alternatively, at first, the head feed motor is controlled in an open loop, the light spot is moved to the vicinity of the target track, and thereafter the seek is performed in the same manner as described above.

Therefore, when seeking to a target information track is performed, a lot of time is required in any of the above-mentioned cases since data following the V mark is reproduced and address information is obtained from the data.

The present invention has been made in view of such a problem, and an object thereof is to seek a target information track in a method of describing a V mark without taking much time. Another object of the present invention is to provide an information recording / reproducing apparatus which makes it easy to manage recorded information.

<Means for Solving the Problems> In order to achieve the above object, the information recording / reproducing apparatus according to the present invention, after recording information on an information recording medium, reproduces the recorded information and executes an error check. Means to
Means for recording a code indicating the absence of an error (hereinafter referred to as an X code) including consistent address information at a predetermined position on the information recording medium based on the result of the error check.

<Operation> Since the code indicating no error contains consistent address information, it is possible to know the current position only by reproducing the code, and to know whether or not it is the target information track position. it can.

<Example> Hereinafter, an example of the present invention will be described in detail with reference to the drawings. An optical card will be described as an example of the information recording medium used in the present invention.

First, the basic configuration of the optical card and the configuration of the optical head will be described. In the following description, the same members are denoted by the same reference numerals.

FIG. 2 is a schematic plan view of an example of the optical card used in the present invention.

 FIG. 3 is a partially enlarged view of part A in FIG.

In both figures, tracking tracks 5 (51, 52,...) Formed in a continuous linear form in advance on the optical card 1 are arranged at equal intervals. Then, a data recording unit 4 (4) for recording information for each tracking track.
1,42, ...) are provided. That is, the optical card 1 has a data recording section in all of the space between the tracking tracks.

As shown in FIG. 3, the tracking track 5-1 and
The G mark 7 is provided between the G mark 7 and the G mark 51. The G mark 7 is a mark for determining a reference track, and is arranged at a predetermined position on the optical card by preformatting. On the extension of the data recording section 40 having the G mark 7, a medium type identification pattern 8 as an auxiliary data section is recorded and formed in a preformat or a light spot. The medium type identification pattern 8 indicates the type of the optical card, and records information such as a modulation / demodulation method, a data capacity per track, and the total number of tracks.

FIG. 4 is an explanatory diagram relating to the configuration of the optical head section of the information recording / reproducing apparatus.

FIG. 5 is an explanatory diagram showing a light beam irradiated on the optical card.

 FIG. 6 is an explanatory diagram showing the configuration of the photodetector.

A light beam emitted from a light source 27 such as a semiconductor laser is collimated by a collimator lens 28 and divided into three beams by a diffraction grating 30. These light beams are imaged by the objective lens 26 on the tracking tracks 51 and 52 and the data recording section 41 on the optical card 1 as shown in FIG. 5 to form beam spots S1, S2 and S3. Here, the optical card 1 is moved in the direction of arrow R by driving means (not shown), and is scanned by the beam spot in the direction in which the tracking track extends. Beam spot S
The reflected lights of S1, S2 and S3 pass through the objective lens 26 again, are reflected by the beam splitter 20, and are projected by the condenser lens system 21 to the photodetectors 22, 23 and 24, respectively. Condensing lens system
Reference numeral 21 denotes an astigmatism system, which is an example arranged so that auto-focusing can be performed by a well-known astigmatism method. These photodetectors are configured in the arrangement shown in FIG. 6, and the photodetectors 23 are four in number, as in A, B, C, and D.
Has been split. In FIG. 4, reference numeral 29 denotes a prism for converting the cross-sectional distribution of the collimated light beam emitted from the semiconductor laser from an ellipse to a circle.
This is a mirror that guides the light beam to the mirror.

Next, the operation of recording information on an optical card using the above-described device will be described with reference to FIG.

First, when information is recorded in the data recording unit 41, the beam spots S1, S2, and S3 are respectively set on the tracking track 52,
Irradiate the data recording section 41 and the tracking track 51.
These beam spots are scanned in the direction of arrow F by the movement of the optical card 1 as described above. Beam spot S1
The reflected light from the laser beam enters the photodetector 22 described above, and the reflected light from the beam spot S3 enters the photodetector 24, and a tracking signal is detected by a so-called three-beam method. That is, when the beam spots S1 and S3 deviate from the tracking tracks 52 and 51, a difference occurs in the light intensity incident on the photodetectors 22 and 24, and a tracking signal is obtained by comparing the signals from these light receiving surfaces. It is. Based on this tracking signal, the beam spots S1, S2, S3 are moved in a direction perpendicular to the scanning direction by a tracking means (not shown) (for example, means for moving the objective lens 26 in the Z direction in FIG. 4) (FIG. 2D). Direction) and AT is performed. Then, the recording bit 31 is accurately recorded on the data recording section 41 along the tracking tracks 51 and 52 by the beam spot S2.

 Next, the information recording / reproducing apparatus of this embodiment will be described.

The information recording / reproducing apparatus of this embodiment is characterized in that after verification, a special code (X code) indicating the absence of an error including the logical track number of the corresponding data is recorded on the extension of the information track. is there.

Hereinafter, a method of recording and reproducing information using the X code and a method of recording the X code will be described.

FIG. 7 is an explanatory diagram of the operation of recording and reproducing on an optical card by the information recording and reproducing apparatus of the present embodiment.

FIG. 8 is a flowchart for explaining the operation at the time of reproduction using the X code.

FIG. 9 is a flowchart for explaining the operation at the time of recording using the X code.

Hereinafter, the operation of reproducing information and the role of the X code will be described with reference to FIG. 7 in accordance with the flow of FIG.

In FIG. 7, 1 is an optical card, 71d to 74d are recorded data, 71X, 73X, and 74X are X codes corresponding to the data.
00 to 710 are position coordinates on the optical card 1 and indicate a point 70 using, for example, (700,705).

The light spot is located at the coordinates (700, 705) at the beginning or by a head feed mechanism (not shown), and the data of the target information track to be reproduced is data 74d.

First, the light spot moves from the coordinates (700, 705) to the coordinates (701, 705) as shown at 801 in FIG. Then, the code is reproduced from the coordinates (701, 705) (FIG. 80, FIG. 80).
2). The reproduction is completed when the coordinates (702, 705) are reached, and the logical track number (in FIG. 8, indicated as an address) of the information track where the current light spot is located can be known from this code. This is compared with the target logical track number (see FIG.
3) In this example, the light spot is moved to the coordinates (704, 706) because it is different from the target logical track (FIG. 8, 801), and the same operation is repeated.

Then scan from coordinates (702,706) to coordinates (700,706)
Since there is no X code, this information track is found to be an invalid track. From coordinates (700,706) to (7
(00, 707), (704, 707), and (704, 708), and thereafter, the light spot reproduces the X code 74X, and it is found that this information track is the target information track.

Therefore, the moving direction of the light spot is reversed at the coordinates (700, 708), and the target data 74d is reproduced in the direction of the coordinates (704, 708) (FIG. 8, 804).

Since the X code is added only to the valid track, the consistent address included in the X code is a logical address. Normally, in a higher-level device such as a host computer, information management and information reading are performed using the logical address. Therefore, the present invention has an effect that information management becomes easy by implementing the present invention.

Next, an information recording operation will be described with reference to FIG. 7 in accordance with the flow of FIG.

In FIG. 7, reference numeral 75d denotes data to be recorded from now on, and 75X denotes an X code corresponding to the data 75d.

By the way, the light spot is set to the coordinates (700, 70
5) Next, the light spot is moved to the coordinates (704, 705) in the same manner as in the above-mentioned reproduction (No. 9).
(FIG. 901) The X code is reproduced (FIG. 9, 902). It is determined from the logical track number included in the code whether or not the track is the target track (FIG. 903). Hereinafter, the same operation is repeated to reach the X code 74X of the target information track (the information track to be recorded is unrecorded because of the recording operation. Therefore, the information track immediately before the information track is deleted. Target information track.)

Here, the light spot is moved to the coordinates (700, 709), and the coordinates (7
03, 709) (FIG. 9, 904).

After the recording is completed, the light spot is inverted at the coordinates (710, 709), and the recorded data 75d is verified (FIG. 9, 905). As a result, if there is no error, the coordinates (702,709)
Then, the X code is recorded (FIG. 9, 906). If there is an error in the verification result, the light spot is moved by the above-described method to record the same data on the next information track. In this case, no X code is recorded (FIG. 90).
7).

Since the number of bits required for recording the X code is smaller than the number of recording bits for the corresponding data, the X code has higher redundancy when redundant bits of the same length are added to each. In this way, it is easy to make the redundancy of the X code higher than the redundancy of the corresponding data, so that the probability of occurrence of an unrecoverable error of the X code is made lower than that of the corresponding data. And effects such as increasing the accuracy of information management can be obtained.

Further, when an error correction code is included in the X code and the correction capability is higher than that of the data corresponding to the X code, it is possible to reduce the reproduction error of the X code.

In this embodiment, the optical card is used as the information recording medium. However, it is obvious that the present invention can be applied to other information recording media such as a disk.

<Effects of the Invention> The information recording / reproducing apparatus according to the present invention comprises: means for reproducing information recorded on an information recording medium and then performing an error check; and recording information based on a result of the error check. Means for recording a code indicating no error including consistent address information at a predetermined position on the medium, so that the current position can be immediately known simply by reproducing the code indicating no error, and a high-speed target track can be obtained. Seek is possible.

In addition, since the consistent address included in the code indicating no error is assigned only to valid information tracks, information management is facilitated.

Furthermore, if the redundancy of the code indicating no error, the correction capability of the error correction code, etc. are made higher than those of the corresponding data, the accuracy of the information management increases, and the system such as the reliability at the time of recording / reproducing information is improved. Has the effect of significantly improving the reliability of the device.

[Brief description of the drawings]

FIG. 1 is a schematic diagram of an embodiment of the information recording / reproducing apparatus of the present invention. FIG. 2 is a schematic plan view of an example of the optical card used in the present invention. FIG. 3 is a partially enlarged view of part A in FIG. FIG. 4 is an explanatory diagram relating to the configuration of the optical head section of the information recording / reproducing apparatus. FIG. 5 is an explanatory diagram showing a light beam irradiated on the optical card. FIG. 6 is an explanatory diagram showing the configuration of the photodetector. FIG. 7 is an explanatory diagram of the operation of recording and reproducing on an optical card by the information recording and reproducing apparatus of the present invention. FIG. 8 is a flowchart for explaining the operation at the time of reproduction using the X code. FIG. 9 is a flowchart for explaining the operation at the time of recording using the X code. 1 ... optical card, 9 ... CPU, 10 ... MPU, 11 ... AT / AF
Control circuit, 12: Modulation / demodulation circuit, 13: Head feed motor, 14: Card feed motor, 15: AF actuator, 16: AT actuator, 17: Irradiation optical system, 18
… Optical pickup, 19 …… drive, 71d, 72d, 73d, 74d,
75d ... information, 71X, 73X, 74X, 75X ... X code.

Claims (3)

(57) [Claims] And a means for reproducing the recorded information and performing an error check after recording the information on the information recording medium, wherein the information is consistent with a predetermined position on the information recording medium based on a result of the error check. Means for recording a code indicating no error including address information. 2. The code according to claim 1, wherein the code has a higher redundancy than the recorded information corresponding to the code.
An information recording / reproducing apparatus as described in the above. 3. The information recording / reproducing apparatus according to claim 1, wherein the code includes an error correction code having a higher correction capability than the recorded information corresponding to the code.