JPS62131318A - Information storage device - Google Patents

Abstract

PURPOSE:To reduce the number of memories, and to perform the transfer of a bit of information effectively by storing a bit of record information at a buffer memory in the inversion time of the reciprocating movement of a recording medium in a device which stores the bit of information reciprocating the recording medium. CONSTITUTION:First of all, a data is stored at a buffer memory 111 from a host side. And when an optical head arrives at a recording area on an optical card, data is read out from the buffer memory 111, and is recorded at the optical card. When write is completed, the inversion of the reciprocating movement is performed, however, at such a time, the same data as the one just recorded is transferred again to the buffer memory 111 from the host side. In a backward movement time, the data just recorded is read out, and the contents of both data are compared, and when they are coincided, a transfer request signal is outputted, and the transfer of the data to be written at the next track is received from the host side in the inversion time of the reciprocating movement.

Description

Detailed Description of the Invention [Technical Field] The present invention relates to an information storage device using a recording medium that performs reciprocating motion.

[Prior Art] In recent years, card-shaped recording media that are small and convenient to carry have been considered. When this card-shaped recording medium is moved back and forth to transfer information to be recorded from a host computer etc. to a storage device and record information, the information is transferred and stored in the memory while at the same time reading the information from the memory. However, this method requires multiple sets of memories and has the disadvantage that the recording device cannot perform other processing during transfer.

[Objective] The present invention has been made in view of the above points, and aims to reduce the number of memories and efficiently transfer information.

[Example] An example of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a schematic plan view of an optical card applicable to the present invention. In FIG. 0, an optical card 1 is shown.

Clock tracks 21, 22, 23° where a clock signal is recorded and formed in an intermittent broken line shape, and tracking tracks 31, 32 formed in a continuous line shape.
．． ---1 are arranged alternately at equal intervals. Recording tracks 41°, 42.43. for recording data between each track. ----- is provided.

FIG. 2 is a block diagram showing the configuration of the information storage device in this embodiment.

This optical card 1 is placed on a mounting table 31 fixed to an endless bell (20). The belt optical head 33 includes a semiconductor laser 11, a collimator lens 12. Diffraction grating 13
．． It is composed of an objective lens 14, a reflecting mirror 15, an objective lens 16, and photodetectors 17-19.

It is detected by the detector 15. The signals detected by the photodetectors 17 to 19 are transmitted to the 4G code demodulation circuit 22) tracking control circuit 23. The focus control circuit 24 and the tracking control circuit 23 move the objective lens 14 in the optical axis direction and in the direction perpendicular to the optical axis, respectively, and perform autofocusing (AF) and autotracking (AT). and

A stepping motor 28 moves the optical head 33 in a direction perpendicular to the plane of the paper, thereby moving the irradiation position of the light beam and performing track access (seek operation). The motor 21 is controlled by a motor drive circuit 25. 35 and 36 move and stop the optical card.
is a sensor that detects the inverted position of the mounting table 31, and is composed of a micro switch or a photo interrupter, etc.
When the mounting table 31 is detected by the reversal sensors 35 and 36, the detection signal is an interface that controls the input/output of signals to and from the motor tail side (not shown).

FIG. 3 is a perspective view showing a part of the configuration of a data recording/reproducing apparatus for implementing the present invention. Here, the beam emitted from a light source 11 such as a semiconductor laser is transmitted through a collimator lens 12.
and is divided into three beams by the diffraction grating 13. These beams are focused on the optical card 1 by the objective lens 14, moved in the beam direction or b direction, and scanned by the beam spot in the direction in which the tracking track and the clock track extend.

Beamsbot) Sl, S2. The reflected light of S3 passes through the objective lens again, is reflected by the mirror 15, and is directed by the condenser lens 16 to the photodetectors 17, 18 .
19 respectively. These photodetectors are arranged side by side in the Z direction shown in the figure. Further, these entire optical systems are moved in the direction of arrow C by a stepping motor 28.

FIG. 4 is an enlarged view of the optical card recording surface for explaining the operation when recording data using the apparatus of FIG. 3. first,
When recording information on the recording track 41, spots s1. s2. s3 respectively on the clock track 21. The recording track 41 and the tracking track 31 are irradiated. These spots are scanned in the direction of the arrow d by moving the optical card 1 in the direction a as described above. The reflected light from the spot S1 enters the aforementioned photodetector 17, and a clock signal is reproduced.

Further, the reflected light from the substrate S3 enters the photodetector 19, and a tracking signal is detected by a known method such as the so-called push-pull method. Then, by step S2, the data is transferred in the d direction.The operation when the data recorded as described above is reproduced using the same device d is shown in FIG.

Spots sl, s2. s3 are recording tracks 41.s3, respectively. Tracking track 31. The recording track 42 is irradiated with light, and as the optical card moves in the a direction, the optical card l is scanned in the arrow d direction. Then, while detecting the tracking signal with the photodetector 18 corresponding to the spot s1. 0-th order (slot) SL for simultaneously reproducing two columns of data recorded in the recording tracks 41 and 42 with the photodetectors 17 and 19 corresponding to S3.

s2. s3 on 4 recording tracks, 32 tracking tracks. The recording track 44 is irradiated with light, the optical card is moved in the b direction, and each spot is scanned in the e direction. Then, while the photodetector 18 performs tracking detection, the photodetectors 17 and 19 simultaneously reproduce data recorded on the recording tracks 43 and 44. By repeating such operations, data recorded in a plurality of columns can be read out two columns at a time at high speed without skipping.

In this embodiment, since two lines are read simultaneously, two line buffers are prepared as shown in FIG.
For example, in FIG. 5, data read from the recording track 41 is demodulated by the demodulation circuit 22-1 and stored in the line buffer lO1, and data read from the recording track 42 is demodulated by the demodulation circuit 22-2 and stored in the line buffer lO1. 1
02. Then, the switches 104 are sequentially switched and the signals are output from the line buffer to the interface 37. Note that when storing data in line buffers 101 and 102, address counters 105 and 1 are used, respectively.
Controlled by 06. This address counter 105
．． A clock 106 counts up and counts down, and registers 107 and 108 set preset values. d direction j 1 de! Top 1 width +
Shi ki Iki Kei ~;also Koj-j;r# shi
H! ' Since data is scanned in the L direction, the address counter increments.However, when reading in the e direction, data is scanned in the opposite direction to the writing direction, so the data is read in the opposite direction and is also stored in the line buffer. Stored in reverse direction. When data is read from the line buffer, the address counter is decremented from the preset value to read in the opposite direction to the direction in which data is stored in the line buffer, so that data is output in the correct order. In addition to the method of decrementing from a preset value, it is also possible to hold an incremented value and decrement from that value.

FIG. 7 is a time chart showing how information is read from the optical card and transferred to the host side.

First, when a data read command is input from the host side, the card moves at a constant speed, and when the optical head reaches the recording area, data is read from the card on two tracks at the same time using the method described above. Repair and cover 1. At this time, the line buffer and address counter are cleared.The contents of the data stored in the line buffer include preamble data for applying PLL. , a sync mark for starting data, recorded data, and postamble data for applying PLL- when reading in the reverse direction are stored.Then, when the optical head reaches outside the recording area,
When data writing to the buffer memory is completed (1 point per day), the contents of the buffer memory are read, a sync mark is detected, and the recorded data is ready to be transferred immediately (1 point). In this state, it waits for a transfer request signal from the interface. When there is a transfer request, the recorded data is read from the buffer memory 101, then the recorded data is read from the buffer memory 102, and the transfer starts directly to the memory on the host side (1 point tD), and then all the recorded data in the buffer memory is read and transferred. is completed (t E 1 point), and when the card is moved back, the recorded data is transferred in the same manner as above when the card is reversed.

FIG. 8 is a block diagram for recording data on an optical card, and is a partially detailed diagram of the block diagram in FIG. 1. Recording data is sent from the host side, stored in the buffer memory 111, modulated by the signal modulation circuit 112, sent to the laser drive circuit 32, and recorded on the card by a laser beam. Note that writing to the buffer memory is controlled by an address counter, similar to the above-described reproduction.

FIG. 9 is a timing chart showing how data is recorded on the optical card. First, a data transfer command is sent from the host side to the device side, and then data is transferred. Then, this data starts to be stored in the buffer memory 111 (point tF). At this time, the buffer memory and address counter are cleared. When the optical head reaches the recording area, data is read out from the buffer memory in synchronization with the recording speed. Recording on optical card <(
At this time, the preamble data, sync mark, and postamble data mentioned above are also recorded. When the optical head reaches outside the recording area and the writing is completed, the same data as the data just recorded is sent from the host side again. Transfer and store in buffer memory 111 (tH point)
. When the optical card returns, when the optical head reaches the recording area, the data currently recorded on the optical card is read out and stored in the buffer memory 101 (<CtI point).

Note that the card feeding speed during reading is much faster than the card feeding speed during recording. When the optical head reaches outside the recording area of the card and the reading is completed, the contents of the buffer memory 111 and the contents of the buffer memory 101 are compared, and if they are equal, a transfer request signal is output.
Have the host side transfer the data to be written to the next track (tJ). If the two do not match, have the same data transferred again 1,% 'In Small [
Since data is written in the reverse direction in the buffer memory 101, when reading data, decrement the address counter and read the data in the correct direction. go.

[Effects] As explained above, according to the present invention, the number of memories can be reduced and information can be transferred efficiently.

[Brief explanation of drawings]

FIG. 1 is a schematic plan view of an optical card applicable to the present invention, FIG. 2 is a block diagram showing the configuration of an optical card reader/writer, FIG. 3 is a perspective view showing a partial configuration of the optical card reader/writer, and FIG. Figure 4 is an enlarged view of the optical card recording surface to explain the operation when recording data, Figure 5 is an enlarged view of the optical card recording surface to explain the operation when reproducing data, and Figure 6 is an enlarged view of the optical card recording surface to explain the operation when recording data. A block diagram showing the configuration for reproducing and transferring data, Fig. 7 is a time chart during data reproducing, Fig. 8
The figure is a block diagram showing a configuration for recording data on an optical card, and FIG. 9 is a time chart during data recording. In addition, 1 is an optical card, 22 is a signal demodulation circuit, 112 is a signal modulation circuit, and 101, 102, and 111 are line buffer memories. Q

Claims (4)

[Claims] (1) A device that records information by reciprocating a recording medium, comprising a memory that temporarily stores information to be recorded on the recording medium, and when reciprocating the reciprocating movement of the storage medium,
An information storage device, characterized in that the recorded information is stored in the memory. (2) The information storage device according to claim 1, wherein the recording medium moves at a constant speed when recording information, and decelerates or accelerates when storing information in the memory. (3) An information storage device according to claim 1, wherein the recording medium is a card-shaped recording medium. (4) The information storage device according to claim 1, wherein information is recorded during forward movement, and errors in the recorded information are checked during return movement.