JPH01143019A - Reader for optical card - Google Patents

Abstract

PURPOSE:To exactly read recording data on an optical card by giving a reading trigger signal to the driving circuit of a line sensor based on a data track period information signal. CONSTITUTION:A timing to read the data track of one string on an optical card 2 is determined by the data track period information signal which is a pulse signal A from a rotary encoder 6 to be fitted to a ball screw 3 to constitute one part of a riving system to move the optical card 2. Since one time scanning of a line sensor 10 is executed by this reading timing, one time scanning of the line sensor can be executed to the data track of one string. Accordingly, synchronization between the scanning period of the line sensor 10 and the period of the data track of the optical card 2 is obtained and the recording data on the optical card 2 can be exactly read at a high speed.

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention is characterized in that data is recorded in a data recording section consisting of a plurality of linear data tracks in the form of dots based on differences in the amount of reflected light or transmitted light. The present invention relates to a reading device that reads data recorded on an optical card.

(Prior Art) Various types of recording media from which data can be optically read are known.

Particularly in the field of discs, read-only, write-once, and rewritable discs have been developed, and the play-only and write-once types have come into practical use.

On the other hand, recently, an optical card, which is an optical recording medium in the shape of a card, has been known. This optical card differs from an optical disk in that, as shown in the external view in FIG. A dot-shaped pattern is recorded based on the difference in the amount of light or the amount of transmitted light.

By the way, as a device for reproducing data recorded on such an optical card, a line sensor such as a CCD (charge-coupled device) line sensor is installed parallel to the data track T.
While moving the optical card while keeping it parallel to the line sensor, the irradiation light from the light source is focused on the recorded data on the optical card, and the reflected light is focused on the line sensor, thereby data is recorded. A system has been proposed in which the recorded data of the track T is read one after another, and the recorded data of the entire surface of the card is read.

(Problems to be Solved by the Invention) However, such conventionally proposed optical card reading devices have the following problems. That is, when reading data recorded on an optical card with a line sensor, the line sensor reads one row of data tracks T and then moves to the position of the next data track T. Therefore, it is desirable to move the optical card at a speed equivalent to the speed at which the line sensor scans once. However, in the conventional system, the speed of the drive system that moves the optical card and the scanning cycle of the line sensor are not synchronized, so the speed at which the line sensor can scan multiple times per row of data tracks T is not maintained. I have no choice but to move the optical card.

As a result, this poses a problem in increasing the reading speed of data recorded on the previous card and simplifying data processing.

The present invention was made to solve the above-mentioned problems, and it synchronizes the scanning period of the line sensor with the period of the data track of the optical card, and records data on the optical card at high speed and accurately. An object of the present invention is to provide an optical card reading device that can read optical cards.

(Means for Solving the Problems) In order to achieve the above object, the present invention provides dot recording based on the difference in the amount of reflected light or transmitted light in the data recording section consisting of a plurality of linear data tracks parallel to each other. A line sensor is arranged parallel to the data track of the optical card on which data is recorded, and while the optical card is moved while maintaining the parallel state with the line sensor, the irradiation light from the light source is directed onto the optical card. A reading device that reads recorded data on an optical card by focusing light on the recorded data and imaging the reflected light on a line sensor, comprising: an encoder attached to a drive system for moving the optical card; The sensor is configured to include phase control means for providing a read trigger signal to the line sensor drive circuit based on the data track period information signal which is the output signal from the encoder.

(Function) Therefore, in the optical card reading device of the present invention, the timing for reading one row of data tracks is determined by the data track period information signal from the encoder attached to the drive system for moving the optical card, and the timing for reading one row of data tracks is determined. By performing one scan of the line sensor at the same timing, it becomes possible to perform one scan of the line sensor for one column of data tracks.

(Example) Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a diagram showing an example of the configuration of an optical card reading device according to the present invention. In FIG. 1, an optical card 2 placed on a table 1 is fixed by a guide 4 installed parallel to a ball screw 3, and is moved in the direction of arrow A in the figure by rotating a drive motor 5 for moving the optical card. It is now possible to move to. Here, as shown in an enlarged view of the data recording section in FIG. 2, the optical card 2 has a data recording section consisting of a plurality of linear data tracks T1 to T6 parallel to each other formed at a constant pitch. , digital data such as one-character image data is recorded using dots based on differences in the amount of reflected light or the amount of transmitted light. In addition, a timing line 2a, which is a non-reflective part and has the same width as the data track, is provided in a track section immediately in front of these data tracks T1 to T6.

Further, a rotary encoder 6 is fixedly attached to the ball screw 3, and when the ball screw 3 rotates, a pulse is generated in accordance with the rotation. Here, as the rotary encoder 6. generates 16 pulses during the pitch in which the optical card 2 moves from data track T1 to T2, and moves one row of data tracks to 16
A device with a resolution that can be divided is used.

On the other hand, 7 is a light made of LED etc. for irradiating light? y
, 7, and the irradiated light from this light source 7 is transmitted to a half mirror 8.
The data tracks T1 to T6 on the optical card 2 are irradiated with the reflected light through a half mirror 8 and a lens 9, and an image is formed on a line sensor 10 consisting of a CCD line sensor or the like. Further, as shown in FIG. 3, above the optical card 2, a semiconductor laser 11 for emitting laser light is installed, and the emitted light from the semiconductor laser 11 is transmitted through a lens 12. Timing line 2 on optical card 2 via beam splitter 13 and lens 14
a, and the reflected light is sent to the beam splitter 13. The light is received by a photodetector 16 through a lens 15.

On the other hand, 17 is a phase control device which receives the pulse signal A outputted from the rotary encoder 6 as input, and divides the frequency of the pulse signal A by 16 and sets the phase angle of the frequency-divided signal to 22. This generates a trigger pulse signal B for reading one line that can be changed by 5 degrees. Here, the phase control device 17 has the following functions, as will be described in detail later.
It consists of a phase control circuit and a phase detection circuit. Further, 18 is a line sensor drive circuit that receives the trigger pulse signal B output from the phase control device 17, and drives the line sensor 10 with the trigger pulse signal B to read one row of data tracks. ing.

FIG. 4 is a block diagram showing details of the phase control circuit of the phase control device 17. As shown in the figure, this phase control circuit has a first 4-bit binary counter 19 which receives a pulse signal A outputted from a rotary encoder 6, and a phase pulse signal C outputted from a phase detection circuit described later. The adder 21 receives the output bits of each of the 4-bit binary counters 19 and 20 and outputs the trigger pulse signal B.

FIG. 5 is a block diagram showing details of the phase detection circuit of the phase control device 17. As shown in the figure, this phase detection circuit is
The highest value bit signal output from the first 4-bit binary counter is input to the clock terminal (CK), and the timing line signal E output from the photodetector 16 is input to the clear terminal (CLR). The pulse signal A output from the D flip-flop 22, the rotary encoder 6, and the output signal Q from the D flip-flop 22 are manually generated.

The AND gate 23 outputs the AND output as the phase pulse signal C.

Next, the operation of the optical card reading device constructed as above will be described.

The irradiation light emitted from the light source 7 is irradiated onto the data tracks T1 to T6 on the optical card 2 through the half mirror 8, and the reflected light is received by the line sensor 8 through the half mirror 8° lens 9.

Further, the irradiation light emitted from the semiconductor laser 11 is transmitted to the lens 12. Beam splitter 13. The timing line 2a on the optical card 2 is irradiated through the lens 14, and the reflected light is received by the photodetector 16 through the beam splitter 13° lens 15. Further, a pulse-tally encoder 6 attached to the ball screw 3 generates pulses in accordance with the rotation of the ball screw 3. Sixteen pulses are generated during the pitch at which the optical card 2 moves from data track T1 to T2, and one row of data tracks can be divided into 16.

This 16-divided pulse signal A is transmitted to the phase control device 17.
A trigger pulse signal B for reading one line is generated which can change the phase angle of the frequency-divided signal by 22.5 degrees. When this trigger pulse signal B is input to the line sensor drive circuit 18, the line sensor 10 is driven to read one column of data tracks.

That is, the pulse signal A input from the rotary encoder 6 is converted into signals a, b, c shown in the time chart of FIG. 6 by the first 4-bit binary counter 19.
, d, x2. x4゜X8. The frequency is divided into x16. The second 4-bit binary counter 20 counts up to 16 counts each time the phase pulse signal C from the phase detection circuit is input. Furthermore, when each output bit of each of these 4-bit binary counters 19 and 20 is input to the adder 21, the adder 21
The most significant bit (MSB) of can change the phase angle by 360"/16"-22.5" each time the phase nox signal C is input. Note that in the time chart of FIG. , signal e is a trigger when one pulse of phase pulse signal C is input, pulse signal B
The waveform of signal f shows the waveform of pulse signal B, which is triggered when five pulses of phase pulse signal C are input.

On the other hand, in the phase detection circuit, the D-flip flop 2
The highest value bi-soto signal from the first 4-bit binary counter 19 is input to the second clock terminal (CK).
A timing line signal E read by a photodetector 16 is input to the clear terminal (CLR).

In this case, when the data input terminal (DATA) of the D flip-flop 22 is always set at "H" level, the timing line signal E becomes "H" level as shown in the time chart of FIG. After releasing the clear signal, when the rising edge of the highest value bit signal is detected, the output signal Q from the D flip-flop 22 becomes H" level, and the timing line signal E becomes "H" level.
The "H" level is held until the "L" level is reached.This output signal Q and the pulse signal A from the rotary encoder 6
By performing a logical product in the AND gate 23, a phase pulse signal C indicating the phase angle between the highest value bit signal and the trigger pulse signal B is obtained. Then, by inputting this phase pulse signal C to the second 4-bit binary counter 20 of the phase control circuit, the optical card 2
It is possible to match the above data track cycle with the phase difference of the trigger pulse signal B, and by capturing the rising edge of the trigger pulse signal B and inputting it to the line sensor drive circuit 18, one column of data tracks is tracked. It will be read in the center. Thereby, the line sensor 10 can scan the center of the data track without scanning the boundary between the data tracks. In addition, in the time chart of FIG. 7, the phase difference between the data track period on the optical card 2 and the highest value bit signal for each S-signal is 11 of the pulse signal A.
An example when the pulse minute is −22.5×11−247.5° is shown.

As described above, in the optical card reading device according to the present embodiment, the data track period information signal which is the pulse signal A from the rotary encoder 6 attached to the ball screw 3 that constitutes a part of the drive system for moving the optical card 2 is used. determines the timing to read one row of data tracks on the optical card 2, and at the reading timing, the line sensor 10
By performing one scan of the line sensor, one scan of the line sensor can be performed for one column of data tracks. Therefore, it is possible to synchronize the scanning period of the line sensor 10 with the period of the data track of the optical card 2, and read the recorded data on the optical card 2 at high speed and accurately.

(Effects of the Invention) As described above, according to the present invention, an encoder is attached to the drive system for moving the optical card, and the timing for reading the data track of the optical card is determined based on the data track period information signal from the encoder. Since one scan of the line sensor is performed at this reading timing, it is possible to synchronize the scanning period of the line sensor with the period of the data track of the optical card, thereby allowing the recorded data on the optical card to be recorded at high speed. Moreover, it is possible to provide an optical card reading device that can read the optical card accurately.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of an optical card reading device according to the present invention, FIG. 2 is an enlarged view showing details of the data recording section of the optical card in the same embodiment, and FIG. FIG. 4 is a block diagram showing details of the phase control circuit of the phase control device in the same embodiment; FIG.
The figure is a block diagram showing the details of the phase detection circuit of the phase control device in the same embodiment, FIGS. 6 and 7 are time charts for explaining the operation in the same embodiment, and FIG. 8 is a block diagram showing the details of the phase detection circuit of the phase control device in the same embodiment. FIG. C...Card, T, Tl to T6...Data track, M...Data recording section, 1...Table, 2...
Optical card, 3... Ball screw, 4... Guide, 5.
... Drive motor, 6... Rotary encoder, 7.
...Light source, 8...Half mirror-19...Lens, 1
0... Line sensor, 11... Semiconductor laser, 12
...Lens, 13...Beam splitter, 14...
- Lens, 15... Lens, 16... Photodetector, 17... Phase control device, 18... Line sensor drive circuit, 19... First 4-bit binary counter, 20... Second 4-bit binary counter, 21
...Adder, 22...D flip-flop, 23.
...and gate. Applicant's agent Patent attorney Takehiko Suzuta 1T+1T21T31T41T51T6IFigure 2Figure 3Figure 4Figure 5

Claims (2)

[Claims] (1) A line sensor is installed in the data recording section consisting of multiple line-shaped data tracks parallel to each other, in parallel with the data track of the optical card, where data is recorded in dots based on the difference in the amount of reflected light or transmitted light. While moving the optical card while maintaining a state parallel to the line sensor, irradiation light from a light source is focused on recorded data on the optical card, and the reflected light is directed onto the line sensor. A reading device that reads data recorded on an optical card by forming an image includes an encoder attached to a drive system for moving the optical card, and a data track period information signal that is an output signal from the encoder. An optical card reading device comprising: , a phase control means for providing a reading trigger signal to a drive circuit of the line sensor. (2) The phase control means includes a phase control circuit for changing the phase angle of the data track period information signal from the encoder, an information signal obtained from the data track timing line provided on the optical card, and the encoder. 2. The optical card reading device according to claim 1, further comprising a phase detection circuit for detecting a phase relationship with a data track period information signal from a data track period information signal.