JPH03150724A - Information recording medium - Google Patents

Abstract

PURPOSE:To miniaturize a recording/reproducing device with substantially no decrease in memory capacity by dividedly providing data regions and providing a common recognition region between the adjacent data regions. CONSTITUTION:An ID region 54a of the corresponding data region 53a is provided in continuation with the data region 53a at the left end of an optical card 51 and the ID region 54b of the corresponding data region 53b is provided in continuation with the data region 53b at the right end. The common ID region 54c for the corresponding data regions 53a, 53b is provided in continuation with the data regions 53a, 53b between the data regions 53a and 53b. The driving range in the track direction of the medium in the recording/reproducing device is decreased with substantially no decrease in the recording capacity if the data regions are dividedly provided in such a manner and the part between the adjacent regions is constituted as the common recognition region without forming the same as a non-recording region. The recording/reproducing device is, therefore, miniaturized.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to an information recording medium.

[Conventional technology]

Conventionally, a card-shaped medium as shown in FIG. 4 has been proposed as an information recording medium. In this optical card 1, information is reproduced by detecting changes in the reflectance of the recording surface, and information is recorded by physically changing the recording surface.

This information is recorded or reproduced in units called tracks, and a plurality of linear strip-shaped tracks 2 are arranged in parallel to constitute one optical card 1.

In the optical card 1 shown in FIG. 4, in order to search for a target track, a track number pattern of the track 2 and a specific recognition pattern common to each track for recognizing the track number pattern are provided at both ends of each track 2. The recorded ■D areas 3a and 3b and these ■DW4
A data area 4 for recording the loading data is provided between the areas, and a card driving pattern 5 for controlling card driving is provided.

FIG. 5 shows the configuration of the track 2 shown in FIG. 4. In FIG. 5, each track 2 has eight cells on each side of the clock pattern 6. -1~? -8,7-9
~7-16, consisting of 10 areas 3a and 3b
, the common recognition pattern is in area 8 of cells 7-5 to 7-12, and the track number pattern indicating the track number is in area 9 of cells 7-1 to 7-4.7-13 to 7-16. For example, each is recorded in binary code.

An optical card having such an ID1l area is also disclosed in, for example, Japanese Utility Model Application No. 63-145669.

In the information reproducing device using the optical card 1 described above,
For example, as shown in FIGS. 6A and 6B, the optical card 1 is placed on the frame 15, and the optical card 1 is moved to the card motor 1.
6 in the track direction via rubber rollers 17a and 17b.

Further, an optical pickup 18 for reproducing information from the optical card I is arranged opposite to the optical card I, and is driven by a seek motor 19 via a screw 20 in the theta direction perpendicular to the track. It has become.

The optical pick amplifier 18 has a configuration shown in FIGS. 7 and 8, for example. In addition, Figure 7 is the 6th EB.
FIG. 8 is a view seen from the same direction as FIG. 6A. In Figures 7 and 8,
Light from a light emitting diode (LED) 21 is projected onto the optical card 1 via a collimator lens 22, a half mirror 23, a mirror 24, and an objective lens 25, and the reflected light passes through a collimator lens 22, a half mirror 23, a mirror 24, and an objective lens 25. 26, and is received by a photodetector 27.

The objective lens 25 has its optical axis direction (focus direction)
F and the optical card I are supported by the base of an optical head (not shown) via four wires 28 so as to be displaceable in the track width direction (tracking direction) T, and are controlled in the focus direction F and tracking by a known focus and tracking actuator (not shown). It is designed to be driven in direction T.

Further, the LED 21 is at the focal position f of the collimator lens 22.
In this conventional example, the optical card 1 is located at a position slightly further away than the focal position f0, and in the focused state where the optical card 1 is located at the object-side focal position of the objective lens 25, the LED 2
The illumination light from 1 is converged in front of the optical card 1 to illuminate the optical card 1 in a defocused state.

In this way, the illuminance distribution of the illumination light on the optical card 1 becomes as shown by the solid line in FIG. 9 in the focused state, and when the optical card 1 is closer to the objective lens side, It becomes as shown by the broken line in the figure, and conversely, when it moves away, it becomes as shown by the dashed line in FIG. In this way, the illuminance distribution of the illumination light on the optical card 1 changes depending on the distance between the objective lens 25 and the optical card 1, but as is clear from FIG. Even if the distance between the objective lens 25 and the optical card 1 changes, a ring-shaped unchanging part (indicated by reference numeral 29 in FIG. 9) whose illuminance hardly changes occurs, and inside and outside of this unchanging part 29, the illuminance hardly changes. In this case, the change in illuminance due to the change in the focal state of the objective lens 25 is reversed. That is, when the optical card l approaches the objective lens side rather than the focal position of the objective lens 25, the illuminance increases on the inside of the unchanged portion 29 compared to when in focus, but decreases on the outside, and vice versa. The optical card 1 is attached to the objective lens 25.
When moving away from the focal point, the illuminance decreases inside the unchanged portion 29 compared to when it is in focus, whereas it increases outside the constant portion 29.

In this conventional example, the track of optical power - and l is set to the unchanged part 2
In addition to effectively illuminating the inside of the lens 9, a focus error signal is detected by utilizing the change in illuminance distribution between the inside and outside of the unchanging portion 29 as a boundary.

FIG. 10 shows the configuration of an example of the photodetector 27 shown in FIG. 7. In FIG. An image of the pattern on the optical card is projected onto the photodetector 27, and 16 data reading light receiving areas 41-1 to 41- are provided so that 16 pieces of data in the width direction on each track 2 can be read simultaneously. 16 is the provision. In addition, in each track 2, 17 of the clock pattern image is arranged so as to receive the image of the clock pattern 6.
Ten clock generation light receiving areas 42-1 to 42-1° are provided in the track direction at 2 pitches, and are arranged in the track width direction so as to receive light from both edge portions of the clock pattern image in the track width direction. Four pairs of servo light receiving areas 43-1 to 43-8 are provided spaced apart and facing each other.

In addition, the light receiving device for data reading 8I Mi 4 ] −1
~41-16, clock generation light receiving area 42-1~4
2-10 and the servo light receiving areas 43-5 to 43-8 are arranged so as to correspond to the inside of the unchanged portion 29 of the illumination light of the LED 21 irradiated onto the optical card 1, and the servo light receiving areas 43-1 43-4 are arranged so as to correspond to the outside of the unchanged portion 29.

In this way, in this conventional example, the servo light receiving area 43
A focus error signal is obtained by determining the difference between the total amount of light received by the servo light receiving areas 43-5 to 43-8.

In addition, the total amount of light received by the servo light receiving area 43-5.43-7 and the servo light receiving area 43-6.43-8
A tracking error signal is obtained by calculating the difference between the total amount of light received at While performing focus servo using this focus error signal, the optical pickup 18 is moved in the track width direction (theta direction) to scan the ID area 3a or 3b, and is synchronized with the clock signal generated at each zero cross of the tracking error signal. Based on the outputs of the data reading light receiving areas 41-1 to 41-16, the track number pattern is read at the time the recognition pattern is detected to search for a desired track. In addition, when reading data on the searched track 2, the optical card 1 is moved in the track direction while performing focus and tracking servo based on the focus and tracking error signals, and the light receiving areas 42-1 to 42-10 for clock generation are moved. A clock signal is obtained based on the output, and in synchronization with this clock signal, the outputs of the data reading light receiving areas 41-1 to 41-16 are taken in and the data is reproduced.

[Problem to be solved by the invention]

However, in the conventional optical card described above, since the information recording area is provided from one end of the card to the other, there is a problem that the card drive range in the recording/reproducing device becomes large and the device becomes large. There are problems in that data loss during recording or reproduction increases when track misalignment occurs due to defects in the card, and the influence of skew due to card driving also increases.

As a method to solve such problems, for example,
As disclosed in Japanese Patent No. 2-92249, it is conceivable to divide the information recording area of an optical card in the track direction as shown in FIG. By doing this, the card drive range is halved, so the device can be made smaller, data loss due to recording or playback can be reduced in the event of track misalignment due to card defects, etc., and skew due to card drive can be reduced. The impact of this can also be reduced.

However, in the optical card 45 shown in FIG. 11, in order to prevent warping or damage to the card, a non-recording area 47 is provided between the partial information recording areas 46a and 46b. , when recording/reproducing from both directions in the track direction, an I
It is necessary to provide a D pi area. For this reason, IDSi
There is a problem in that the area increases and the recording capacity of the data area, together with the non-recording area 47, decreases.

This invention was made by focusing on such conventional problems, and allows recording/recording without substantially reducing recording capacity.
To provide an information recording medium suitably configured so that a reproducing device can be made compact, data loss due to recording or reproducing when track misalignment occurs can be reduced, and the influence of skew can also be reduced.

[Means and operations for solving the problem] In order to achieve the above object, the present invention divides a data area having a plurality of mutually parallel tracks into at least two parts in the track direction, and divides the adjacent data area into two parts in the track direction. A common recognition area for recognizing tracks in the two data areas is provided between them.

By dividing the data area in this way and configuring the adjacent data areas as a common recognition area without making them non-recording areas, the storage capacity of the medium in the recording/playback device can be improved with almost no reduction in recording capacity. The driving range in the track direction can be reduced.

Therefore, the recording/reproducing apparatus can be made smaller, data loss due to recording or reproduction when track misalignment occurs can be reduced, and the influence of skew can also be reduced.

〔Example〕

FIG. 1 shows a first embodiment of the invention. This optical card 51 has an information recording area having a large number of tracks 52 parallel to each other, and is divided in the trunk direction into two data areas 53a and 53b. 1st
In the figure, a data area 5 is located at the left end of the optical card 51.
3a, the ID area 54c of the data area 53a
, and 10 areas 54b of the data area 53b are provided at the right end portion continuously from the data area 53b. Moreover, between the data areas 53a and 53b, these data areas 5
Continuing from 3a and 53b, the data areas 53a and 5
A common ID area 54c for 3b is provided.

In this embodiment, the track numbers in the data areas 53a and 53b are numbered in order from the upper left to the lower left and from the lower right to the upper right in FIG.
When recording/reproducing data to a, insert the optical card 51 into the recording/reproducing device with the left end in FIG. Area 53a and 10 area 54
If the optical card 51 is to be driven back and forth in the area c and to record/reproduce data in the data area 53b, insert the optical card 51 into the recording/reproducing device with the right end, that is, the 10 area 54b at the beginning, and insert the optical card 51 into the recording/reproducing device. 51 is caused to reciprocate in the In area 54b, the data area 53b, and the ID area 54c.

Furthermore, in order to control the reciprocating drive of the optical card 51 corresponding to the data areas 53a and 53b described above, a card drive pattern 55a corresponding to the data area 53a and a card drive pattern 55a corresponding to the data area 53b are provided on the optical card 51. A pattern 55b is provided.

FIG. 2 shows the structure of the track 52 shown in FIG. Each track 52 has eight cells -1 to 7-8 . on both sides of the clock pattern 6, as in FIG.
In this embodiment, in the ID areas 54c, 54b and 54c, among the sequential cells 7-1 to 7-16, cells 7-1.7-2.7
-5°7-8 and 7-9.7-12.7-15.7-
16 as a recognition pattern area 8, record a binary code symmetrical with respect to the clock pattern 6, for example 0111111O, in these cells, and record the remaining eight cells as a track number pattern area 9, recording a track number pattern in these cells. Make sure to record it.

Here, the track number pattern is IO6i area 54a
and 54b, the corresponding data area 5
The absolute values of the track numbers 3a and 53b are recorded in 8-bit binary code, and in the ID area 54c, a data area 53 is recorded on one side of the clock pattern 6.
The lower 4 bits of the track number pattern of data area 53b are recorded on the other side.

6A and B using the optical card 51 of this embodiment.
A seek operation by the information reproducing apparatus shown in FIG. 1 will be explained.

In this seek operation, the optical pickup 18 is moved by the seek motor 19 via the screw 20 with respect to the optical card 51 in the theta direction perpendicular to the track, and thereby the ID area Mi54a is moved in accordance with the insertion direction of the optical card 51. , 54b or 54c, the data reading light receiving area 41-1 is scanned in synchronization with a clock signal generated every zero cross of the tracking error signal.
Based on the output of steps 41-16, the trunk number pattern at the time when the recognition pattern is detected is read. If the read track number pattern is the desired track number, the drive of the seek motor I9 is stopped to close the tracking servo, thereby completing the seek operation to the target track.

Here, when reading the 10 areas 54a and 54b, the read track number pattern is used as the track number of the corresponding data area 53a and 53b. Since the lower 4 bits of the track number (bits 0 to 3L) are not recorded, the corresponding upper 4 bits are managed by the microprocessor unit (MPU), and the data of the upper 4 bits and the read lower 4 bits are Calculate the track number based on and. Here, it is assumed that the absolute track number (hereinafter referred to as BT) before starting to read the ID area 54c has already been read and known.

In calculating the track number using the ID1fl area 54c, taking into account reading errors and movement of the optical pickup 18 within the width plate of the lower 4 bits, the upper 2 bits (bit 2 and bit 3) of the lower 4 bits are set to OO.
Only when the track number changes from 11 to 11, that is, the track number decreases by one, and only when the track number changes from 11 to OO, that is, the track number increases by one, calculate the track number by adding -1 and +1 to the upper 4 bits, respectively. do.

Specifically, first add the lower 4 bits of the read current track number and the upper 4 bits of the track number BT managed by the MPU before starting reading, and then calculate the value by
8 bits). Next, check whether bit 2 and bit 3 of the lower bits of X are OO or 11, and if they are OO, further BT (
Check bits 2 and 3 of the lower bits (8 bits). Here, bit 2 and bit of BT
If 3 is 11, the track number has increased by one from BT, so only in this case add 1 to the upper 4 bits of X to make it the track number; in other cases, leave X unchanged. Track number.

Similarly, bit 2 and bit 3 of the lower bits of X
If is 11, check bits 2 and 3 of the lower bits of BT, and if they are 00, it means that the track number has decreased by one compared to BT, so only in this case The upper 4 bits are set to 1 and used as a track number, and in other cases, X is used as is as a track number.

Note that if bit 2 and bit 3 of the lower bits of X are other than 00 and 11, X is used as the track number as is.

In this way, by recording the lower 4 bits of the track number pattern of the data areas 53a and 53b in the 10' area 54c, the track numbers of the corresponding data areas 53a and 53b in the ID area 54c can be known. .

After seeking the target track as described above, while performing focus and tracking servo based on focus and tracking error signals, the optical card 5
1 in the track direction to obtain a clock signal based on the clock pattern 6, and in synchronization with this clock signal, the information recorded in the corresponding data area 53a or 53b is read and the data is reproduced.

FIG. 3 shows the main part of a second embodiment of the invention. In this embodiment, the track number pattern area 9 of the D area 54c between the data areas 53a and 53b in FIG. track number pattern).

In an optical card having such a track format,
To seek a desired track, first, after inserting the card, seek the +osl area 54a or 54b, read the master track, and check which data area 53a or 53b is to be read.

Note that the master trunk number is 10 areas 54a and 5.
4b, and data indicating data area distinction, maximum track number, card type, etc. is recorded here.

Here, when seeking a track in the data area 53a, the 10 areas 54a and 54c include the data area 53a.
Since the track number is recorded, the target track is sought using the track number read in the ID jl area 54a or 54c as it is. Furthermore, when seeking a track in the data area 53b, when seeking this in the rD area 54b, since the track number of the data area 53b is recorded in the 10 area 54b,
In the same way as above, the read track number is used as is to seek the target track. On the other hand, when seeking a track in the data area 53b using the rD area 54c, since the track number of the other data area 53a is recorded in the ID area 54c, the MP [J ((maximum track number -
^X) - (read trunk number) + 1) to seek the target track while calculating the track number of the data area 53b. If you do this, ■ D area 5
The same track number can be obtained when seeking with 4b.

In the above embodiment, the recognition pattern and the track number pattern are each 8 bits, but these are not limited to 8 bits and can be set arbitrarily.

〔Effect of the invention〕

As described above, according to the present invention, the data area is divided and provided, and adjacent data areas are configured as a common recognition area without being a non-recording area.
The driving range of the medium in the track direction in the recording/reproducing apparatus can be reduced without substantially reducing the recording capacity. Therefore, the recording/reproducing device can be made smaller, and
Data loss due to recording or reproduction when track deviation occurs can be reduced, and the influence of skew can also be reduced.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing a first embodiment of the present invention, and FIG. 2 is a diagram showing a first embodiment of the present invention.
3 is a diagram showing the main part of the second embodiment of the present invention, FIG. 4 is a diagram showing a conventional optical card, and FIG. FIGS. 6A and 6B are diagrams showing an example of an information reproducing device for an optical card. FIGS. 7 and 8 are diagrams showing an example of the optical pickup shown in FIGS. 6A and B. Figure 9 is a diagram showing changes in the illuminance distribution of illumination light on the optical card; Figure 1θ is a configuration diagram of an example of the photodetector shown in Figure 7;
FIG. 1 is a diagram showing another conventional optical card. 6-...Clock pattern? -1～7-16-・・
Cell 8--Recognition pattern area 9-Track number pattern area 51...-Optical card 52-) Rack 53a
, 53b - data area 54a, 54b, 54cm
ID area 1 Figure 4b Figure 5 Figure 6 Figure 7 Figure 8 Figure 9 Figure 1O Figure 1i Figure 7

Claims (1)

[Claims] 1. A data area having a plurality of tracks parallel to each other is divided into at least two in the track direction, and a method for recognizing tracks in the two data areas between adjacent divided data areas. An information recording medium that has a common recognition area. 2. The information recording medium according to claim 1, wherein the recognition area has at least a part of information indicating a track number and a specific recognition pattern common to each track for recognizing the track.