WO1989001222A1

WO1989001222A1 - Optical recording medium

Info

Publication number: WO1989001222A1
Application number: PCT/JP1988/000766
Authority: WO
Inventors: Shigeru Izawa
Original assignee: Kabushiki Kaisha Csk
Priority date: 1987-07-30
Filing date: 1988-07-29
Publication date: 1989-02-09
Also published as: JPS6433727A

Abstract

A card-like optical recording medium has a data recording area that includes reference lines and elongated data track regions neighboring the reference lines. To indicate the individual track numbers, at least one track identifier is provided on each data track region or reference line along its lengthwise direction. The track number portion is constituted of a track number data sandwiched between a preamble and a postamble which are not the data of track number. At the time of writing and reading the data, the track identifier is read in the order of the preamble, track number data, and postamble. Therefore, other data are not erroneously read as track numbers, and the region for data track can be reliably distinguished, thus improving the access precision.

Description

Details

Optical recording medium

[Technical field ]

The present invention relates to an optical recording medium in which a data recording area is provided on a card-type substrate, and more particularly to an optical recording medium with an improved recording format.

L ^ technology]

In recent years, optical recording media for recording digital data by forming an optical change pattern such as bright and dark bits on a data recording surface have attracted attention. . This optical recording medium is capable of recording data at a high density in a very small area, so that a large capacity memory can be realized. For this reason, a force-type memory having a form similar to that of magnetic force is considered, not limited to a disk.

At this time, since the optical recording medium can perform high-density recording as described above, a large amount of data can be recorded in a small area. Therefore, when reading and writing data, it is possible to accurately and quickly guide the write / read head to the position where writing or reading should be performed. It is necessary .

For this reason, various types of disk-type optical recording media have been put to practical use.

In the case of a card-type recording medium, a non-rotating type recording medium is used. As a medium, many data tracks are arranged side by side on the data recording surface of the card. Therefore, in order to find the desired data track, the write Z read head must be provided with the track number provided for each track. Read it and read it.

However, when data is to be randomly accessed, the head must be placed at the position where the track number is written on each tractor. However, as described above, the optical recording medium is intended for high-density recording, so even though it is a card-type recording medium, there are many data trans- missions. Since tracks will be placed, it is not easy to quickly find the desired track from among them, and it is not easy to read the track number. There was also a mistake.

The present invention has been made to solve the above-mentioned problems. Therefore, even if it is a card-type optical recording medium on which a large number of data tracks are arranged, it can be accessed quickly and accurately. It is intended to provide an optical recording medium that can carry out the recording.

[Disclosure of the Invention]

The present invention provides an optical recording medium having a card-type substrate provided with a data recording area, in which a plurality of reference lines are juxtaposed to achieve the above-mentioned object, The belt-shaped area is defined as a data track area, and at least one of the above-mentioned data track area or the reference line is provided along the longitudinal direction of the data track area or the reference line. Display track numbers and track numbers. In the

The above track number part is composed of track number data and preambles and bombers, which are data that hardly exist as track numbers. And a strobing device, wherein the track number data is sandwiched between the preamble and the boastamble.

The above-mentioned track number portion is provided for each data track. The location can be any suitable location, but is preferably near both ends of each data track. In this case, two tracks are provided, but it is preferable to arrange the contents of both track numbers in contrast. Arrange multiple track numbers at each location.

The track number part includes a CRC (Cyclic Redundancy Code) together with the track number data between the preamble and the post assembly. You may have such erroneous re-detection code data. The track number is a preset pattern, for example, the digital value of the track number (for example, binary code or binary coded 10 decimal). Code). The preamble described above is, for example, a fixed number of data of the all-ones, and the above-mentioned bottom assembly is, for example, a predetermined number of the all-zeros. It is data.

Also, place track numbers near both ends of each data track. In the case of the near side, the leading part, which is the initial position for each data track of the write Z read head, is installed at the extreme end, and the track number part is inside it. It is preferable to provide it. Alternatively, the end of the track number part may be configured to function as an introduction part. In that case, the track number part is assigned to each data part. It may be provided at the outermost end of the rack.

The track number part can be provided either on the data track area or on the reference line, and the track number etc. is displayed at each position. By writing an optical pattern, a '' can be formed. Of course, the track number part can be provided both on the data track area and on the reference line.

The track number part is located in the same data track area or in the vicinity of both ends of the same reference line, the preamble and the boss tremble, and the track number data. Can be placed so that they are symmetric.

The track number part may be provided at the same data track area or at three places at both ends and the center of the same reference line.

If multiple data tracks are set between two adjacent reference lines,: *: The invention is applicable.

In the invention, since the track number portion is simply composed of the track number data, the data before and after the track number does not exist as the track number. Preambles and posts Since an assembly is provided so that the track number data is inserted between the two, it is erroneous to interpret other data as track numbers. In addition, the data track can be reliably identified. That is, the start of the track number data is reliably recognized by the presence of the preamble, and the track number data is recognized by the presence of the preamble. The end can be recognized with certainty.

-If a plurality of track number parts are provided in succession and reading is performed a plurality of times, reading accuracy is further improved. Also, if the track number part is provided at a plurality of distant places such as both ends in the track direction, the track number can be read at the nearest place Therefore, it is possible to access a target data track efficiently and in a short time. For example, if track numbers are provided at both ends of the track, when the write Z read head accesses the head, the head is accessed. Just move it to the nearest end of each data track.

In addition, when track number parts are provided at both ends of a data track area or at both ends of a reference line, the first track number part is used. Since the second track number part can be symmetrically placed on the S with the tracking part in between, the data write for each track is possible. When the reading or reading is completed, the head is moved to another track without returning to the beginning of the track, and the head is moved to the other end of the track. You can access the track. [Brief description of drawings]

FIG. 1 is a front view showing the appearance of an optical recording medium according to a first embodiment of the invention.

FIG. 2A is an enlarged view of a main part showing a part of a data track provided on an optical recording medium according to a first embodiment of the invention.

FIG. 2B is an enlarged view of a main part of a modified example of the first embodiment, and FIG. 3 is a partial view of a data track provided on an optical recording medium according to the second embodiment. Enlarged view of the main part, shown enlarged.

FIG. 4A is an enlarged view of a main part showing a part of a data track provided on an optical recording medium according to a third embodiment of the present invention.

FIG. 4B is an enlarged view of a main part of a modification of the third embodiment, and FIG. 5 is a part of a data track provided in an optical recording medium according to a fourth embodiment of the present invention. Of the main part

FIG. 6: ^ A main part enlarged view showing a part of a data track provided on an optical recording medium according to a fifth embodiment of the present invention,

Figure 7 you good beauty FIG. 8 is Ru Oh an explanatory view showing a selection cce scan to that aspect in any of the 2 thick of data theft rack _β

[Best mode for carrying out the invention]

* An example of the invention will be described with reference to the "^ side." Of the first embodiment>

FIG. 1 and FIGS. 2A and 2B show the configuration of the first embodiment of the present invention. FIG. 1 is a front view showing the appearance of the * optical recording medium of the embodiment, and FIG. 2A is a part of a data track provided on the optical recording medium according to the first embodiment of the present invention. FIG. 2B is an enlarged view of a main part shown in an enlarged scale, and FIG. 2B is an enlarged view of a main part of a modification of the first embodiment.

As shown in FIG. 1, the optical recording medium of this embodiment has a plurality of strip-shaped reference lines 4 arranged side by side on a recording medium 2 provided on a card-type substrate 1. The band-shaped area sandwiched between 4 is provided as a data track area 3.

The reference line 4 is formed when the recording medium 2 is formed. That is, the recording medium 2 is formed with different optical properties so that it can be clearly distinguished from the recording medium 2. For example, the force S can be formed as a band-like high reflectance portion on the recording medium 2 by using a photo technique.

In the present embodiment, as shown in FIG. 2A, an introductory portion (lead) is provided at a portion serving as the data track area 3 in the longitudinal direction of the reference line 4. In) LI, track number section TN, and data section DT are sequentially partitioned and provided. That is, they are arranged in the data recording area 3 in the order of LI-TN-DT. The position of the region 3 is located on one end side and inward by a length corresponding to the length of the introduction portion LI.

_ ^ Is defined.

In this embodiment, the introduction part LI uses both ends of the reference line 4 are doing .

The track number part TN, the preamble B, which is data that does not exist as a track number, the track number data C, and the track number And a postamble E that is not present and is different from the preamble B. In the last embodiment, the brimble B is 12 "1" s, the track number data C is a 4-digit binary coded decimal code (16 bits), The stumble E is four "0" s. The track number is set sequentially from the reference position to each track No., for example, 00, 01., 02….

The track number part TN may be read and written multiple times as shown in Fig. 2B.

In the last embodiment (as in the other embodiments), the timing clock for data reading uses the phase lock rule of the data track read signal. No clock track is required because the power can be generated through the loop (PLL) circuit. Of course, a separate clock track may be provided.

Of the first real example

The operation of the optical recording medium of the * real example constituted as described above will be described. Note that, here, the writing and reading operations are shown, but the optical recording medium of the embodiment can be set to writing only or reading only.

First, set the optical head to the initial position to write or read data on the optical recording medium of this example. You This initial position should be set in advance as a home position. In this embodiment, for example, it is set as the lower left end of the recording area 2 in the optical recording medium shown in FIG.

After that, the optical head set at the initial position is moved to the position of the track where data is to be written, or the track is to be read. Various forms are possible for this movement. For example, there is the following mode.

(1) Move while reading the track spine TN corresponding to each data track sequentially, and when the target track number is read, stop the movement and stop the relevant track. Read the data from the rack.

(2) Cumulatively counts the end number of the introduction section LI, and when it reaches the count value corresponding to the track number, the track number is calculated from the track number section TN of the relevant track. Check that it is the intended track.

* In the embodiment, the above-mentioned embodiment is adopted.

When reading the track number part T N, first read the Brian B. As a result, the reader can surely recognize that the next data is the track number data C. In addition, after reading the track number data C, the reading device reads the postamble E following the track number data C. Make sure that the rack number data C has been completed.

As shown in Fig. 2B, the track number is added to the track number part. If the number is repeatedly written several times, check whether the read number data matches or not, and check whether the number was read correctly. I can do Sick. For example, if you have been arrested four times and have written, if three of the four repetitions were read in agreement, that data would be read. Assuming that the track number is the track number, it is checked whether the data corresponds to the target track number.

If this is the desired track, use an optical head to write or read the data. At this time, the optical head is designed to optically track the reference line, to write, or to follow the data track to be read and to track the data. Read and write.

Next, for a certain data track, when the writing or reading of the data is completed, the optical head and the beginning of the data track are placed next to each other. Go to the data track you want to read or write. The mode of movement at this time is the same as that described above. However, it is not necessary for the optical head to move to the above-mentioned initial position, and the above-mentioned count accumulation is performed using the current track number as an initial value to find the target track. I can do it.

In order to read and write data while performing tracking as described above, for example, an optical beam for tracking and a write An optical head for emitting reflected light and a light beam for reading at regular intervals is used to detect reflected light, and is provided by the reflected light. Optical information This can be achieved by performing tracking and data reading (providing a monitor for writing).

When writing, the data is written to the data track area 3 of the band-shaped area sandwiched by the reference line 4 to form a data track. . The writing of the data is performed by irradiating the data track area 3 with a laser beam such as a laser beam emitted from an optical head to melt, Due to the effects of blackening, phase transformation, and the like, the light-spot-irradiated portion of the region 3 is denatured, and the optical properties such as reflectivity are changed. It is. * In the embodiment, the data is written to the optical recording medium by associating the long and short bits with the digital values "1" and "0". .

When the same information is to be written on a large number of optical recording media, it is possible to form the same information by printing no and turn as in the case of forming the reference line 4. it can .

To read data written in this way, use the same optical head as in the above writing. Immediately, the data track area 3 is irradiated with a light beam emitted from a laser beam or the like emitted from the optical head, and the reflected light is reflected. This is done by receiving light from a photo diode or the like. As a result, the level of the reflectance of the data track area 3 is converted into an electric signal waveform, and data is read from the pattern of this waveform. ''' The structure of the second example

FIG. 3 shows the main part of the second embodiment of the invention. In this embodiment, the first introduction portion LI (left side of the drawing) is provided at a portion serving as the data track area 3 in the data recording area 2 in the longitudinal direction of the reference line 4. ), The first track number TM (same as above), the data section DT, the second track number section TN (on the right side of the drawing), and the second introduction section LI (same). It has been provided. That is, LI-TN-DT-TN-LI are placed in the data track area 3 in the order of LI-TN-DT-TN-LI. The first introduction section LI and the first track number section TM and the second track number section TN and the second introduction section LI sandwich the data section DT. S is symmetrically placed. '

The first introduction section LI and the second introduction city LI use part of both ends of the reference line 4. In addition, in the last embodiment, the first introduction part LI and the second introduction part LI are formed completely identically, but they need not always be identical. For example, they may have different lengths.

The track numbers of the first track number part TN and the second track number part TN are, of course, the same.

In addition, the first track number part TN and the second track number part TN are described once or continuously plural times. The track number written in the second track number section TN located on the right end of the track is formed so that it can be read by moving from right to left. This is convenient for access. --It may be formed so that it moves from left to right and reads. When reading in the reverse order of the written order, the data of the read group of track number patterns is transferred to a buffer in the reading device. Etc., and the data can be read out in reverse order by the last-in, first-out control.

Operation of the second embodiment>

The operation of the optical recording medium according to the last embodiment configured as described above will be described. The operation of this embodiment is almost the same as that of the first embodiment, and only the differences will be described below.

When writing or reading of a data track is completed, the 'optical head' returns to the beginning of the data track. Instead, move to the data track that will be the target of the next read / write at the end of the data track. The mode of movement at this time is exactly the same as described above. That is, only the first introduction section LI and the first track number capital TN replace the second introduction section LI and the second track number capital TN. The detection effect of the rack is completely the same.

Therefore, the time required for changing the optical head can be saved, and access can be made in a short time.

3rd embodiment>

FIG. 4 shows the structure of an optical recording medium according to a third embodiment of the invention. This embodiment is obtained by adding new components to the track number section TM of the first embodiment shown in FIG. 2A. That is, in the track number portion TN of the large embodiment, the 8-bit CRC data D is provided between the track number C and the bottom amble E. .

Of the third implementation

By recording the CRC in each data track, it is possible to detect an error in reading the track number.

Fourth embodiment>

FIG. 5 shows the configuration of the fourth embodiment of the present invention. In this example, the track number part TN of the fourth embodiment is provided at both ends of the data track area. * In other words, in the data recording area 2, the portion serving as the data recording / tracking area 3, along the longitudinal direction of the reference line 4, the first introduction section LI (Left side of drawing), first track number part TN (same), data part DT, second track number part TN (right side of drawing), and second introduction part LI (same) Are sequentially partitioned. -A plurality of first and second track number parts TN may be provided in series.

Further, in the second and fourth embodiments, the rack number part is provided at two places for each data track. Good. For example, it can be provided at both ends of each data track and at the center, that is, three places in total. In this way, access to the other track from the vicinity of the center of one track becomes faster.

Fifth Embodiment>

FIG. 6 shows the configuration of the fifth embodiment of the present invention. * The embodiment differs from the above embodiments in that the track number portion TN is formed on the reference line 4.

In the case of the large embodiment, it is preferable that the reading of the track number T N is performed by a tracking light beam. Of course, a configuration in which a dedicated reading light beam is provided, or a configuration in which another optical head is provided may be employed. In addition, a configuration may be adopted in which a retrack number is read out using an optical beam for writing or reading.o

In FIG. 6, although the track number portion TN track number is written on the reference line 4 with the same width as the reference line 4, the track number portion is written. The width may be made thicker than the width of the other part of the reference line 4. In this way, it is easy to read the track number and the track number. In particular, for tracking, it is preferable to keep the width of the reference line 4 constant including the track number portion TN.

Although not separately shown, even when the track number section TN is provided on the reference line as shown in Fig. 6, a plurality of track number sections are continuously provided. It is easy to think of an embodiment in which the ridges are provided at both ends of the reference line. 6th embodiment>

In all of the above examples, there is a data track of 1 * between the reference lines to be inscribed, but they are shown in Fig. 7 and Fig. 8. As described above, the present invention can be applied to an apparatus having a plurality of data tracks between reference lines. In this case, the track number part can be provided on the data track or the reference line as described above.

If the track number part TN is provided on the reference line, one track number will be assigned to a plurality of data tracks. In such a case, the countermeasures are described individually. As an example, consider the case where a 2 mm data track is provided between the reference lines. '

As shown in Fig. 7, when performing re-tracing by either of the sub-beams S i and S ₂ , use a signal to select either of the two beams. Then, data tracks Τι and Τ 2 can be identified by the same track number. Also, as shown in FIG. 8, when the interval between the main beam and the sub beam S is switched, the data track is switched by using the switching signal. , that Ki out and the call that identifies the Τ ₂ in the same door rack number.

Claims

The scope of the claims

(1) An optical recording medium in which a data recording area is provided on a card-type substrate, a plurality of reference lines * are arranged in parallel, and a band-shaped area that comes into contact with the reference line is a data area. The track number is displayed at least at one location along the longitudinal direction of the data track area or reference line as a track area. For those with a track number part,

The track number section contains track number data and pre- and post-store data, which are data that hardly exist as track numbers. An optical recording medium characterized in that the track number data is sandwiched between the preamble and the postamble. .

(2) The track number part is erroneously inserted between the preamble and the postamble together with the track number data and detection code data. The optical recording medium according to claim 1, wherein the optical recording medium sandwiches the optical recording medium.

(3) The claim 1 or the claim that the preamble is the data of the tool 1 and the above-mentioned postamble is the data of the tool 0. Item 3. The optical recording medium according to Item 2.

(4) The optical recording medium according to claim 1, wherein a plurality of the track number portions are continuously provided in the same data track area or the same reference line. .

(5) The same track number area as the track number 5. The optical recording medium according to claim 1, wherein the optical recording medium is provided near the end of the area or the same reference line.

(6) The track numbers are located in the same data track area or near both ends of the same reference line. 6. The optical recording medium according to claim 5, wherein the mark number data is placed S so as to be symmetrical.

(7) The track number part is provided in the same data track area or in three places at both ends and the center of the same reference line. The optical recording medium according to the item.