JPH0198162A - Optical card recording information read device - Google Patents

Abstract

PURPOSE:To minimize a failure in data reading by providing a head detecting part of a sector and an allowance part for the detection action of only a prescribed section from the head. CONSTITUTION:When an optical head 6 enters a sink pattern area at the time of reproducing information, a signal (d) is generated, and a sink instruction generation circuit 4 generates a sink instruction (a). By the instruction (a), a header detection allowance signal generating circuit 8 supplies a detection allowance signal (c) to a NAND gate 85. A header detecting circuit 81 supplies a header pattern detection signal (b) to the NAND gate 85 by data DT separated in a separator 100 and a window WD, and it transmits the signal (b) to a data read circuit 9 when the signal (c) is turned on. Reading starts by the signal (b) and data in the unit of one byte are sequentially read into a CPU 101. Even if the header detecting part 81 cannot detect a normal pattern in one sector and misreads the pattern in data, the gate 85 does not open and reading is not executed since the header detection allowance signal (c) does not exist, whereby there is no influence on reading data in other sectors.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a card-shaped recording medium (hereinafter referred to as an "optical card") in which information can be optically recorded. The present invention relates to an optical card recording information reading device used for reading information.

<Prior Art> In a conventional optical card processing device, an optical head is positioned above a card holder, and the optical card is moved back and forth together with the holder, thereby scanning the optical card with the optical head and recording information. It is for reading. As shown in FIG. 13, an information recording section 71 having a large number of information recording tracks 72 is provided on the surface of this optical card, and by irradiating these information recording tracks 72 with a light beam from the optical head, Information is recorded on and reproduced from the optical card 7. In the figure, 73 is a track guide for causing the optical head to follow the information recording track 72, and 74 is a pit forming an information unit formed on the information recording track 72.

Each information recording track 72 is divided into several sectors, and each sector has a sync pattern, as shown in FIG.
Information is written in the order of header button and data. The sync pattern is used to synchronize this information reading signal with the circuits that make up the optical card recording information reading device.
It is recorded continuously over several bytes at the beginning of each sector. The header button may be of 8 or 16 bits to indicate the beginning of the data, and the data follows.

When the holder starts reciprocating, the optical card 7 will move relative to the optical head. When this optical head scans the information recording track 72 and enters the sync pattern recording area of a certain sector, the optical card recorded information reading device receives a sync command a (14th
(see Figure (1)) is generated. Next, when the optical head detects the header bang, the header detection signal b (Fig. 14 (
2)) is output, and when the data read circuit of the optical card recording information device receives this signal, it starts the data reading operation and continues reading the data until the end of the data. In this case, since the number of bytes of data recorded in each sector is known, the number of read data is counted, and when the counted value reaches a known value, the data reading operation is terminated.

<Problems to be Solved by the Invention> FIG. 15 shows a state in which information of a plurality of sectors is recorded on one information recording track. When reading information in multiple sectors continuously from this information recording trunk, if a regular header pattern cannot be detected in the second sector, and the pattern in the data in the second sector is mistakenly detected as a header pattern. , the data read circuit reads the subsequent predetermined number of bytes as data. As a result, data is read across the second and third sectors, and not only does it fail to read the data in the second sector, but it also fails to read the data in the third sector. There is a problem.

This invention was made with attention to the above problem, and is a novel optical card recording system that can minimize the range of data reading failures by placing restrictions on the operation of detecting the beginning of data in each sector. The purpose is to provide an information reading device.

Means for Solving Problems> In order to achieve the above object, the present invention provides an optical card recorded information reading device for reading each sector of information recorded on an information recording track of an optical card. The sector is provided with a start detection section for detecting the start of data recorded in the sector, and a detection permission section for permitting the detection operation by the start detection section only in a predetermined section from the start of each sector.

<Operation> When reading information from multiple sectors continuously,
Even if the head detector does not detect the head of recorded data in a certain sector, this head detection operation is only permitted for a predetermined period from the head of each sector, so if the head detector does not detect the head of the data in the middle of the data in that sector, There is no possibility of false detection. Therefore, it will only be difficult to read the data in the sector where the detection error at the beginning of the data occurred, and it will not affect the data reading of other sectors. It can be kept to a minimum.

<Embodiment> FIGS. 2 and 3 show an example of an optical card processing device to which the optical card recorded information reading device of the present invention is applied.

In this optical card processing device, a guide mechanism 12 is constructed by disposing two guide shafts 13.13 in parallel in a case 1 having a card insertion slot 11, and a holder 2 is attached to the guide mechanism 12.
An optical cover 6 is disposed on the card insertion side and a card feeding mechanism 5 is disposed on the back side corresponding to the lower part of the holder transition path.

The holder 2 is supported by the guide shaft 13 with bearings 21 provided on both sides. On the bottom surface of this holder 2, there is a card holding section 2.
2 is formed, and this card holding portion 22 is aligned with the position of the card insertion slot 11 of the case 1.

Inside the card insertion slot 11, there is a detector 31 for detecting the inserted optical card 7, and the detector 31 operates to automatically insert the optical card 7 into the card holder 22 of the holder 2. A card loading/ejecting mechanism 3 is provided for loading and unloading the card.

The card loading/ejecting mechanism 3 is located below the holder 2 and has a pair of left and right loading cams 3 on a rotating shaft 32.
3.33 is installed, and the rotating shaft 32 is connected to the loading motor 3 via a speed reduction mechanism 36 consisting of a pulley and a belt.
It is constructed by connecting to 7. The loading cam 33 is a substantially semicircular cam made of a rubber material, and is attached so as to be close to the lower surface of the holder 2 without contacting it when the flat cam surface 34 is positioned horizontally above the rotating shaft 32. ing. In this way, when the loading cam 33 rotates due to the operation of the loading motor 37, the optical card 7 with the spherical cam surface 35 facing is carried into the fixed position of the card holding part 22,
The flat cam surface 34 faces the holder 2 again and the motor 37 stops.

A guide shaft 23 that is perpendicular to the direction of movement of the holder 2 is provided on the rear side of the holder 2 to support a slide member 24, and the slide member 24 is linked to the card feeding mechanism 5.

The card feeding mechanism 5 is connected to a fixed frame 50 inside the case 41.
Two support shafts 51 are provided as bearings, pulleys 52 and 53 are respectively fixed to both support shafts 51, and an endless belt 45 is wound and tensioned, and a connecting pin 55 is vertically installed at a suitable position on the endless belt 54. This pin 55 is supported and connected to the slide member 24. A pulley 56 is fixed to the lower part of one of the support shafts 51, and a drive motor 58 that rotates in one direction is connected to this pulley 56 via a transmission means 57 such as a belt, and an encoder 59 is connected to the other support shaft 51. is installed.

The optical head 6 is supported by a lead screw 60 and a guide shaft 61 arranged in a direction perpendicular to the direction of movement of the holder 2.
The lead screw 60 is a head feed motor 62 that can rotate in forward and reverse directions.
is connected to.

Therefore, when the head feed motor 62 is operated, the optical head 6 is moved by the guide shaft 61 and the lead screw 60 in a direction perpendicular to the feeding direction of the optical card 7, thereby accessing the information recording section of the optical card 7.

As shown in FIG. 13, this optical card 7 has an information recording section 7.
1 includes a plurality of information recording tracks 72, and information is recorded in a plurality of sectors of each information recording track 72 using the MFM modulation method. The optical head 6 reads and writes information on the optical card 7, and the data signal read here is given to the optical card recorded information reading device shown in FIG.

The example of the device shown in the figure is one according to an embodiment of the present invention, and includes a sink command generation circuit 4° data separator 1
00. Header detection permission signal generation circuit 8. Header detection circuit 81. Nant gate circuit 85. The configuration includes a data read circuit 9 and a CPUI 01 of a microcomputer.

The sync command generation circuit 4 receives the data signal d from the optical head 6.
is input to generate a sink command a. This sync command a is for instructing the start of synchronization, and is for the optical head 6.
is generated in response to scanning the seven optical card information recording trunks 72 and detecting the sync pattern of each sector. FIG. 4 shows the data format of the optical card 7 as well as the timing of generation of the sync command a, a header detection permission signal C, a header detection signal S, etc., which will be described later. It has already been explained that in the data format of the optical card 7 shown in FIG. 4, the sync pattern, header button, and data are recorded in the order of each sector.

FIG. 5 shows a specific example of this sink command generation circuit 4, and FIG. 6 shows its time chart. :
27 Palator 42° Monostable Multibibreak 43. It is composed of an AND circuit 44 and the like.

The F/V converter 41 receives the data signal d (see FIG. 6 (1)).
The frequency of is converted to voltage, and the conversion output e (Figure 6 (
2)) is given to the comparator 42, and the comparator 4
2 compares this input with a reference voltage and provides a comparison output f (see FIG. 6(3)) to the monostable multipipe lake 43. The monostable multivibrator 43 is triggered by the rising edge of the input signal and outputs the output signal g (see Fig. 6 (4)).
The AND circuit 44 generates this signal g and the data read signal h from the data read circuit 9 (see FIG. 6 (6)).
A sync command a (see FIG. 6, 15) is generated by performing a logical operation with .

Returning to FIG. 1, the data separator '100 separates the MFM modulated data signal d into a window WD and data DT, and supplies these to the header detection circuit 81 and data read circuit 9.

The header detection circuit 81 detects the input window WD and the data DT (fourth one based on FIG. 8 (see 11 (21))
It detects header punctuation in the data format shown in the figure and outputs a header detection signal b (see FIG. 4 (3)).

FIG. 7 shows a specific example of the header detection circuit 81, and FIG. 8 shows its time chart. Comparator 83 and.

It consists of a header button setting section 84. A header pattern is set in the header button setting section 84 by a dip switch or the like, and the 8-bit parallel outputs QA, Ql of the shift register 82 are set.

... (see Figure 8 +3) +4)) and the setting data of the header bang setting section 84 match, the comparator 83 outputs the header detection signal b (see Figure 8 (5)) as a match output. do.

Returning to FIG. 1, the header detection permission signal generation circuit 8 generates a header detection permission signal C (see FIG. 4 (2) ), and by opening and closing the Nant gate circuit 85 with this header detection permission signal C, the sending of the header detection signal S to the data read circuit 9 is controlled.

FIG. 9 shows a specific example of the header detection permission signal generation circuit 8, and FIG. 8 shows its time chart. The header detection permission signal generation circuit 8 in the illustrated example is composed of a monostable multivibrator 80, and the sink command a (FIG. 10 (1)
)) and generates a header detection permission signal C (see FIG. 10 (2)). As shown in FIG. 4, this header detection permission signal C is set to the minimum necessary pulse width in accordance with the generation timing of the header detection signal S.

Returning to FIG. 1, the data read circuit 9 reads the window WD and the data DT (first
(see Figure 2 (1) and (2)) is input, and read data in units of 1 byte is output to CPUI O1.

FIG. 11 shows a specific example of the data read circuit 9, and FIG.
The figures show their time charts, and the data read circuit 9 in the illustrated example has a shift register 90. Latch circuit 91. Counter 93. flip flop 92.9
4. It constitutes and includes a NOR circuit 95 and the like.

Shift register 90 has window-〇 and data DT
(See Fig. 12 (1) and (2)) and shifts the 8-bit parallel outputs QA, Qm, ... (only QA is shown in Fig. 12 (3)) to the latch circuit 91. Output to. The flip-flop 92 inputs the header detection signal b (see FIG. 12 (4)) and outputs the data read signal i (see FIG. 12 (5)) which falls at the rising edge of the header detection signal b (see FIG. 12 (5)). This data read signal i is given to the counter 93 via the NOR circuit 95, and is also given to the inversion circuit 96 to generate the data read signal h (see FIG. 12 (8)). It is applied to the AND circuit 44 of the sink command generation circuit 4.

The counter 93 inputs the window WD and performs a count-up operation, and when the counted value reaches r8J, the QA-
Among the outputs of the QD, the output Q (see FIG. 12 (6)) rises, and this is the output of the flip-flop 94. Latch circuit 91 and.

The signal is applied to the NOR circuit 95. This counter 93 is first reset by the data read signal i, and thereafter, every time the count value reaches "8", it is given as a QD small output reset signal to clear the count value.

The flip-flop 94 inputs the QD small output and outputs a read flag FG which rises at the rising edge of the QD (see FIG. 12).
7)) and provides it to CPUI O1.

When the latch circuit 91 receives a small QD output from the counter 93, it latches the parallel output of the shift register 90, and when the CPUI O1 receives the read flag FG from the flip-flop 94, it sends a data read command to the launch circuit 91. and fetch the latch data. Note that the read flag FG is cleared when data is read by the CPUl0I.

Next, the operation of the optical card processing device will be explained.

In the card insertion standby state, the holder 2 is inserted into the card insertion slot 11.
The loading cam 33 of the card loading/ejecting mechanism 3 has a flat cam surface 34 located near the holder 2.
is facing.

In this state, when the optical card 7 is inserted from the card insertion slot 11 and the detector 31 detects this, the loading motor 37 is activated and the spherical cam surface 35 rotates, thereby causing the inserted optical card 7 to is the card holding section 22
automatically imported into.

Subsequently, when the drive motor 58 of the card feeding mechanism 5 operates and the endless belt 54 moves, the connecting pin 55 provided on the belt 54 pulls the holder 2 along the guide shaft 13 via the slide member 24 and moves forward. Migrate.

When the connecting pin 55 reaches the outer periphery of the pulley 52, the connecting pin 55 slides the slide member 24 in the width direction with respect to the holder 2, moves half around the pulley 52, and moves to the backward motion side.

Next, the connecting pin 55 moves the holder 2 backward along the guide shaft 13 via the slide member 24, as in the forward movement, and the holder 2 is reciprocated by the continuous rotation of the drive motor 58 in one direction. Ru. When the holder 2 moves back, the information recording trunk 72 of the optical card 7 moves relative to the optical head 6, and information recording or reproduction processing is performed. When the holder 2 returns to the initial position, the head feed motor 62 is operated in conjunction with this, and the guide shaft 61 and lead screw 60 perform a track access operation, and the same card feeding operation is repeated again.

During information reproduction processing, when the optical head 6 scans the information recording trunk 72 and enters the sync pattern recording area of a certain sector, the sync command generation circuit 4 inputs the data signal d from the optical head 6. , generates a sink command a. When the header detection permission signal generation circuit 8 receives this sink command a, it generates a header detection permission signal C and outputs it to the Nante gate circuit 85.

Next, the header detection circuit 81 receives the data DT and the window WD separated by the data separator 100, detects a header pattern, and outputs a header detection signal S to the Nante gate circuit 85.

This Nant gate circuit 85 allows the header detection signal C to pass through and sends it to the data read circuit 9 when the header detection permission signal C is on. When the data read circuit 9 receives the header detection signal, it starts a data reading operation, and data in units of bytes are successively read into cptJlol.

Now, the header detection unit 81 is unable to detect a regular header punch in the second sector shown in FIG. In this case, since the header detection permission signal generation circuit 8 does not output the header detection permission signal C, this header detection signal b' is blocked by the Nante gate circuit 85 and sent to the data read circuit 9. Not sent. Therefore, no data reading operation is performed in the data read circuit 9 (see FIG. 4 (4)).
.

Next, when the header detection unit 81 detects a regular header bang in the third sector and outputs the header detection signal b, in this case, the header detection permission signal generation circuit 8 generates the header detection permission signal C. Therefore, this header detection signal is sent to the data read circuit 9 via the Nante gate circuit 85, and the data read circuit 9 reliably reads the data in the third sector (see FIG. 4 (4)). As a result, a data read error is limited to the second sector and does not affect the third sector.

<Effects of the Invention> As described above, the present invention allows the operation to detect the beginning of data only in a predetermined period from the beginning of each sector. Therefore, if there is a mistake in detecting the beginning, a data reading error will occur only for that sector, and will not affect data reading in other sectors, resulting in a data reading failure. This invention has a remarkable effect of achieving the purpose of the invention, such as being able to keep the scope to a minimum.

[Brief explanation of the drawing]

FIG. 1 is a circuit block diagram of an optical card recording information reading device according to an embodiment of the present invention, FIG. 2 is a plan view showing the mechanism of an optical card processing device to which the present invention is applied, and FIG. Figure 2 is a sectional view taken along the line NR-M, Figure 4 is a time chart of the circuit in Figure 1, Figure 5 is a circuit block diagram showing a specific example of the sink command generation circuit, and Figure 6 is the circuit in Figure 5. 7 is a circuit block diagram showing a specific example of the header detection circuit, FIG. 8 is a time chart of the circuit in FIG. 7, and FIG. 9 is a circuit block diagram showing a specific example of the header detection permission signal generation circuit. Figure 10 is a time chart of the circuit in Figure 9, Figure 11 is a circuit block diagram showing a specific example of a data read circuit, Figure 12 is a time chart of the circuit in Figure 11, and Figure 13 is an information recording circuit. FIGS. 14 and 15 are time charts showing a data reading operation according to a conventional example. 8...Header detection permission signal generation circuit 9...Data read circuit 81...Header detection circuit 85...Nant gate circuit 101...CPU

Claims (1)

[Claims] In an optical card recorded information reading device for reading each sector-by-sector information recorded on an information recording track of an optical card, a head detecting section for detecting the head of data recorded in each sector. An optical card recorded information reading device comprising: a detection permission section for permitting a detection operation by the start detection section only in a predetermined section from the beginning of each sector.