JPH03292580A - Method for driving information recording medium - Google Patents

Abstract

PURPOSE:To always rapidly execute the recording and the reproducing of information by controlling driving in a track direction based on the detecting signal of a position detecting mark provided in common at an information recording medium when a reading signal is not obtained. CONSTITUTION:In the driving of an optical card 1 at reading information, the driving of a card motor is controlled (data-controlled) based on a clock obtained with reading a clock cell 41 of the optical card 1 in respective tracks 2. When the clock is not obtained with it, the driving of the card motor is controlled (photoreflector-controlled) based on the output of a photoreflector and the optical card 1 is drive-controlled. Thus, the recording and the reproducing of the information can be always executed rapidly.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for driving an information recording medium such as an optical card.

[Conventional technology]

An optical card as an information recording medium is used, for example, in 1983-
It is disclosed in JP-A No. 145669, JP-A-2-12672, etc., and is known. In such an optical card, data is reproduced by detecting changes in the reflectance of the recording surface, and data is recorded by physically changing the recording surface. These data are recorded or reproduced in units called tracks, and a plurality of linear strip-shaped tracks are arranged in parallel to form one optical card.

As a card drive device for a playback device using such an optical card, for example, Japanese Patent Application Laid-Open Nos. 1-173185 and 1999. - In the publication No. 173357, Figures 6 to 10
Something like the one shown in the figure has been proposed. In addition, Figure 6~
In order to search for a target track, the optical card 1 shown in FIG. ID 55 areas 3.4 and 5 are provided in which the recognition patterns of
, data areas 6 and 7 for recording data between
is provided. Furthermore, a card driving pattern 8 for controlling card driving is provided on one side edge of the optical card 1.

In such a card driving device, four photoreflectors 9 to 12 each having a light emitting element and a light receiving element are installed so that the card driving pattern 8 of the optical card 1 can be detected.
The optical card 1 is provided in pairs and spaced apart from each other, and the rotational direction of the card motor 51 is controlled based on the output of these cards, so that the optical card 1 is reciprocated by approximately half of its length via the drive roller 13. The data recorded in each data area 6.7 is read by a read head 14.

That is, the optical card 1 is inserted into the frame 15, and the insertion is detected by a suitable detection means, and the drive roller 13 is driven by the card motor 51, thereby moving the optical card 1 into the photo frame 15 as shown in FIG. The reflector 9 detects the card driving pattern 8 and the reading head 14
The reading position of the card is located in the ID area 3, or as shown in FIG. 9, the photoreflector 12 detects the card driving pattern 8 and the reading head 14 is transported to the ID area 5. . Thereafter, in this state, the read head 14 is moved by the seek motor 52.
By rotating the screw 53, the optical card 1 is moved in the width direction (direction perpendicular to the track 2) to seek a desired track 2 in the ID area 3 or 5, and as a result, the track 2 becomes a data area. 6, the state shown in FIG. 8 and the state shown in FIG. The data in the data area 6 is read by reciprocating the optical card 1 between the two states, that is, approximately half the length of the optical card 1.

Also, when the desired data is in the data area 7, the 9th
The optical card 1 is moved back and forth over approximately half the length of the optical card 1 between the state shown in the figure and the state shown in FIG. 10 to read the data in the data area 7.

The reading head 14 projects light from a light source 16 such as a light emitting diode onto the optical card 1 through an illumination lens 17 to illuminate the track 2, and projects its image onto a photodetector 19 through an imaging lens 18. By doing so, the reproduction signal, focus error signal, and tracking error signal are detected based on the output of the photodetector 19.

The above card drive device also includes guide rollers 21 to 23 for guiding one side edge of the optical card 1, guide rollers 24 to 26 for guiding the other side edge, and guide rollers 24 to 26 for guiding the top surface of the optical card 1. Upper rollers 27 to 32 and presser springs 33 and 34 that urge the optical card 1 so that its upper surface comes into contact with the upper rollers 27 to 32 are provided, and guide rollers 24 to 26 are rotated by arms 35 to 37, respectively. The optical card 1 is supported freely by springs 38 to 40 so that one side edge of the optical card 1 comes into effective contact with the guide rollers 21 to 23.

FIG. 11 shows a specific track configuration of the optical card 1 described above. The track 2 includes a clock cell 41 formed in the track direction and eight cells arranged in the track width direction on both sides of the clock cell 41 as a boundary. In ID gH region 3, hatched cells 42-1 to 42-8 are as follows:
The common recognition pattern area is shared with other cells 43-1 to 43-
8 indicates a track number pattern area of data area 6;
Each is recorded in binary code. Also, I
Cell 44 shown with hatching in D'eJf area 5
-1 to 44-8 indicate a common recognition pattern area, and other cells 45-1 to 45-8 indicate track number pattern areas of the data area 7, each of which is similarly recorded in binary code. Furthermore, in the IDfil area 4, on one side bordering on the clock cell 41, there are lower 4 bits of the data area 6.

~bit3) track number pattern (cell 43-1~
434) and the recognition pattern (42-1 to 42-4) are placed on the other side in the lower 4 bits of data area 7 (bitO to bit0).
t3) track number pattern (cells 45-1 to 45-
4) and recognition patterns (44-1 to 44-4) are respectively recorded. Note that the recognition patterns 42-1 to 42-4 in ID area 4, 44-1 to 44-4, and the recognition patterns 42 to 1 to 42-8 in ID areas 3 and 5
and 44-1 to 44-8 have the same pattern. Furthermore, synchronization patterns 46 are recorded in two columns of binary codes in the track direction on the data area 6 side of the 10 area 3, on both sides of the ID 9M area 4, and on the data area 7 side of the ID area 5.

To reproduce the information recorded on the optical card 1 described above, first, as described above, the ID area 3 or ID
? In the TI area 5, the reading head 14 is moved in the theta direction (
track width direction) to scan the ID area 3 and read the recognition pattern at each zero cross of the tracking error signal that occurs when passing through the clock cell 41. The desired track is searched by rearranging the bits of the number pattern in order and reading the track number.

Next, while performing focus control and tracking control using focus and tracking error signals,
Move the optical card l in the track direction and clock cell 4
A clock is obtained from the read signal of No. 1, and the information recorded on the track is read and reproduced in synchronization with this clock.

[Problem to be solved by the invention]

However, in the conventional card driving device described above, the card driving pattern 8 formed on the optical card 1 is detected by the photoreflectors 9 to 12, and the driving of the optical card 1 is controlled based on the detection. Therefore, when the card driving speed fluctuates greatly, even if the card driving pattern 8 can be detected, the ID areas 3 to 5 cannot be accurately stopped at the reading position of the reading head 14 due to overrun. Therefore, there is a problem that the track cannot be read quickly and it takes time to reproduce information.

Such a problem also occurs when recording information, and there is a problem that it takes time to record desired information.

The present invention was made by focusing on such conventional problems, and it is possible to drive an information recording medium such as an optical card as desired even if the drive speed fluctuates or undesirable servo misalignment occurs. An object of the present invention is to provide a method for driving an information recording medium that can always be accurately positioned at the position of the information recording medium, and therefore can always record and reproduce information quickly.

[Means and operations for solving the problem] In order to achieve the above object, in this invention, when an information recording medium having a plurality of mutually parallel tracks is driven in the track direction with respect to a reading head, the information recording medium is While reading the medium information provided on each track of the medium, the drive of the information recording medium in the track direction is controlled based on the read signal, and when the read signal cannot be obtained, the drive of the information recording medium is controlled. The drive of the information recording medium in the track direction is controlled based on the detection signal of the commonly provided position detection mark.

〔Example〕

FIG. 1 is a diagram for explaining an embodiment of the method for driving an information recording medium according to the present invention. In this example, FIGS.
It controls the drive of the optical card 1 shown in FIG.
In the card drive device shown in FIGS. 6 to 10, a card-in sensor/ID positioning sensor 55 for detecting the insertion of the optical card 1 is provided. Low level (
When the optical card 1 passes through the positioning sensor 55, it detects that the optical card 1 has passed the positioning sensor 55 and its output has changed from H to L. to stop the driving of the card motor 51, and then move the optical card 1 so that the central IDjJ area 4 is connected to the reading head 1.
Position it at reading position 4. The driving speed of the cart motor 51 based on the output of the positioning sensor 55 is desirably a so-called low speed that allows the central ID area 4 of the optical card 1 to be correctly positioned at the reading position of the reading head 14.

Furthermore, when driving the optical card 1 when reading information, the driving of the card motor 51 is controlled (data control) based on the clock obtained by reading the clock cell 41 of the optical card 1 in each track 2. If this cannot be obtained, the drive of the card motor 51 is controlled (photoreflector system II) based on the outputs of the photoreflectors 9 to 12 as described above, and the optical card l is driven and controlled as shown in FIG. .

The optical card 1 has 16-bit recognition patterns 42-1 to 42-8 in the ID area 3 of the optical card 1, as shown in a partial detail diagram in FIG. ~42-4.44-1~44-4
, and the 16-bit recognition patterns 44-1 to 44-8 in the ID Si area 4, respectively, to the clock cell 4.
Symmetrical binary code centered around 1, e.g. 011
11110.

Also, ID? Data area 6 side of lI area 3, ID area 40
The two-column synchronization pattern 46 recorded on both sides and the IDN area 5 data area 7 side is a pattern in which all 16 bits of each column are 0000h (hexadecimal), and the data area 6
The number of clock cells 41 in the track direction in and 7 is 3592 clocks, respectively.

The operation of this embodiment will be explained below.

First, in a seek operation, the read head 14 is moved in a direction perpendicular to the track by the seek motor 52 via the screw 53 to scan ten areas 3.4 or 5, and occurs when passing the clock cell 41. When the 8-bit recognition pattern (01111110) is read at each zero cross of the tracking error signal, the track number pattern is read, and if it is the desired track, the drive of the seek motor 52 is stopped, and the tracking servo is closed loop to move to the target track. Complete the seek operation to.

Here, the track number is ID6J [in the scanning of areas 3 and 5, the recognition patterns 42-1 to 42-8.44-1
At the time when ~44-8 is read, track number patterns 43-1~43-8.45-1~45-8 are read,
The bits of the read track number pattern are rearranged in order and reproduced as a track number. Also, ID
When scanning 8M area 4, track number pattern 4
3-1 to 43-4. Since 45-1 to 45-4 each consist of the lower 4 bits, the upper 4 bits of the track number are managed by the control unit (MPU) and read as the upper 4 bits of the track number. The track number is calculated from the lower 4 bits of the track number. In this case, it is assumed that the absolute track number (hereinafter referred to as BT) is known before reading begins. In addition, the management of the upper 4 bits of the track number by the MPU takes into consideration read errors or movement of the read head 4 within the width of the lower 4 bits, and the upper 2 bits of the lower 4 bits, bit 3. bit2
(cell 43-4.43-3:45-1.45-2) is O
Only when changing from 0 to 11 and when changing from 11 to oo, the upper 4 bits are set to -1 and +1, respectively.
do.

Specifically, the lower 4 bits of the current track number and MP
The upper 4 bits of the track number BT managed by U before reading starts are added, and the value is set to X. The upper 2 pinpoints of the lower 4 bits of X, bit 3. Bit 2 is 00 or 11
If it is oo, the upper 2 and 7 bits of the lower 4 bits of BT are t3.
Check bit 2, and only when it is 11, add 1 to the upper 4 bits of X as X+lOh and use it as the track number; otherwise, use X as it is as the track number. Similarly, the upper 2 bits of the lower 4 bits of X bit3. When bit2 is 11, the upper two bits of the lower four bits of BT are bit3. Check bit 2, and only when it is 00, set X as X-10h.
The upper 4 bits of ``X'' are decremented by 1 to obtain the track number, and in other cases, X is used as is as the track number. The upper 2 bits of the lower 4 pintos of X bit3. bit2 is 00,11
In other cases, X is used as the track number. By calculating the track number in this way, the track number can be accurately calculated from a part of the track number, and the current position can be known.

After seeking the target track as described above, the optical card 1 is moved in the track direction while performing focus control and trunking control using focus and tracking error signals to obtain a clock from the read signal of the clock cell 41. , the information recorded on the track is read and reproduced in synchronization with this clock.

In this embodiment, as described above, the optical card 1 is driven by the clock cell 41 of the optical card 1 when reading information.
control based on the clock obtained by reading the photoreflector 9 to
control based on the output of 12. The operation in this case will be described below with reference to the case where the optical card 1 is moved from the ID 85 area 4 to the ID 10 area 3 and information recorded in the data area 6 is read.

When checking the data read in synchronization with the clock obtained from the clock cell 41 in the 10 area 4,
Recognition patterns 42-1 to 42-4.44-1 to 44-4
The 8 bits are 01111110, and the track number patterns 43-1 to 43-4 corresponding to the data area 6 indicate the lower 4 bits (bits 3 to bito) of the track number. When these patterns continue for several to several tens of times, the next synchronization pattern 46 in which all 16 bits are ooooh
is detected for two clocks.

In this embodiment, the synchronization pattern 46 for these two clocks is
The clock is counted from the time when the optical card 1 is detected, and when the clock is detected correctly and the counted value reaches a value at which the optical card 1 should be stopped, the driving of the card motor 51 is stopped at that point.

Here, since the position at which the card drive is stopped has different card stopping accuracy depending on the card speed, the card drive stop position is controlled depending on the card speed.

Therefore, the clock interval is measured by the MPU during data reading to determine the card feeding speed. This card feeding speed is determined by using a running counter, taking the value of the running counter at the time of two previous clock generation as TB2, and the value at the time of one previous clock generation as TBI, and calculating the clock interval Per21 from the difference between them. Interval Per21
It is calculated based on the time per step of the running counter and the time per step of the running counter.

In this embodiment, the card drive stop position is controlled in three stages as shown in the table below, depending on the calculated card speed.

That is, when the card speed is low, such as 115 mm/sec or less, the number of clocks indicating the end of data area 6 is 35.
When the temperature reaches 92, the driving of the card motor 51 is stopped. In addition, when the card speed is 115 to 300 m/5ecO medium speed, the card drive is stopped when the count value (3592-50) is reached, which is 50 clocks before the clock number indicating the end of the data area 6. Thereafter, the ID area 3 is positioned at the reading position of the reading head 14 by overrun. In addition, the card speed is 300ma+/s
If the speed is higher than ec, the count value (359
2-100), the card drive is stopped and the IDpi area 3 is similarly positioned at the reading position of the reading head 14 by overrun.

On the other hand, if a servo disconnection occurs during the process, and the clock is not detected correctly and the information cannot be reproduced, the photoreflector 9 to 1
2, and at the same time, the card drive speed is made low so that the 10 area 3 can be positioned at the reading position of the reading head 14.

Here, servo failure is detected by detecting a focus limit, for example. For example, as shown in FIG. 4, this focus limit is determined by comparing the absolute value FES of the DC component of the focus error signal with the reference value Vref±α using comparators 61 and 62, as shown in FIG. 5A. When the absolute value FES exceeds the reference value Vref±α, the output is set to L to detect the focus limit as shown in FIG. 5B, thereby detecting the occurrence of servo deviation.

After servo disconnection is detected, the MPU switches the card drive from data control based on clock counting to photoreflector control as shown in FIG. The card drive is stopped when the card drive pattern 8 is detected, thereby ensuring that the ID 61 area 3 stops at the reading position of the reading head 14.

Note that the above control is performed by moving the optical card 1 from ID area 3 to ID area 10.
The same applies when moving to area 4 to read information, and when moving optical card 1 between ID area 4 and ID area 5 to read information.

Although the driving method for reproducing information has been described above, the present invention can also be effectively applied to recording information.

〔Effect of the invention〕

As described above, according to the present invention, the driving of the information recording medium in the track direction is controlled based on the reading signal of the information in the medium provided in each track of the information recording medium, and when the reading signal is not obtained, the driving of the information recording medium is controlled. Since the drive in the track direction is controlled based on the detection signal of the position detection mark commonly provided on the information recording medium, even if the driving speed of the information recording medium fluctuates, undesired problems can be avoided. Even if servo misalignment occurs, the information recording medium can always be accurately positioned at a desired position relative to the reading head, and therefore information can always be recorded and reproduced quickly.

[Brief explanation of the drawing]

1 and 2 are diagrams for explaining an embodiment of the method for driving an information recording medium of the present invention, FIG. 3 is a partial detailed diagram of the track configuration of the optical card shown in FIG. 1, and FIG. 5A and 5B are diagrams for explaining the operation thereof, and FIGS. 6 to 11 are diagrams for explaining the conventional technology. 1.-Optical card 2-Dou rack 3.4.5-.
ID area 6. 'l-Data area 8-Card driving patterns 9-12-Photoreflector 13-Drive roller 14-Reading head 15-
Frame 16 - Light source 17 - Lighting lens
18-Imaging lens 19-Photodetector 21
~26- Guide rollers 27~32-Upper roller 3
3, 34-Pressure spring 35-37-Arm 3
8 to 40-Hane 41- Clock cell 42-1 to 42-8. 44-1 to 44-8-・Recognition pattern 43-1 to 43-8. 45-1 to 45-8=) Rack number pattern 46- Synchronous pattern 5 Knee Card motor 52- Seek motor 53- Screw 55- Card-in sensor/10 positioning sensor 6162- Comparator Fig. 1 Fig. 4 Fig. 6 Fig. 7

Claims (1)

[Claims] 1. When driving an information recording medium having a plurality of tracks parallel to each other in the track direction with respect to a reading head, while reading the information in the medium provided in each track of the information recording medium, based on the read signal. to control the driving of the information recording medium in the track direction, and when the read signal is not obtained, the track direction of the information recording medium is controlled based on the detection signal of the position detection mark provided in common on the information recording medium. A method for driving an information recording medium, the method comprising controlling driving in a direction.