JPS623478A - Optical recording information writing device - Google Patents

Abstract

PURPOSE:To eliminate an accurate shifting control in XY directions, to make a device small-sized and to execute the high speed data recording of a large quantity of cards by executing an equal continuous rotating control and the positioning in the radius direction and writing the data in the circumference direction of respective optical memory media. CONSTITUTION:A mounted optical memory card C accompanying the rotation of a disk 10 by a servo motor 12 is shifted onto the circumference and the condition is written. At the time of writing, the writing data are sent from a writing data control part 36 to the shift register of a writing timing correcting means 34, and simultaneously, the designating signal of the writing track is sent to a writing head position control part 22. The control part 22 receives the designating signal, drives a motor 20, shifts a head 18 in the radius direction and sets to the writing track position. In such a way, while the disk 10 is rotated to many cards C at the constant-angle speed, the head 18 is shifted in the radius direction, the data are written, and therefore, the positioning is made easy, the device is made simple and a large quantity of the data can be automatically written to many cards in a short time.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides an optical recording medium placed on the circumference of a rotating disk,
The present invention relates to an optical recording information writing device that writes data in a circumferential direction using a writing head.

[Prior art] In recent years, small information recording media have been used to replace magnetic cards.
Optical memory cards with large storage capacities ranging from several seven kilobits to several megabits are attracting attention.

Typical uses of this optical memory card include storing various software and storing various data. In these applications, optical memory cards are often issued with data etc. recorded in advance.

By the way, the optical memory card used for this kind of purpose is
At present, it has not been put into practical use yet, and the reason is that
This is because it is not easy to record data quickly and inexpensively.

Conventionally, as a means of writing data to this type of optical memory card, the card and the write head are moved relatively linearly on the XY plane, and data is written in columns to form a large number of data columns in parallel. A method is being considered.

[Problems to be Solved by the Invention] However, in this conventional way of thinking, in order to move the card and the writing head relatively on the XY plane, a precise drive control mechanism is required, resulting in an increase in the size of the device. At the same time, it has the disadvantage of being expensive.

Furthermore, since data is written on one card at a time, it is not suitable for recording data on a large number of cards at high speed, and there is a problem in that the price of cards with data recorded on them increases.

The present invention has been made to solve the above problems, and eliminates precise movement control in the X and Y directions, making it possible to miniaturize the device, make it inexpensive, and record data on a large number of cards at high speed. It is an object of the present invention to provide an optical recording information writing device which can reduce the price of a card with data recorded thereon.

[Means for Solving the Problems] The first invention of the present application is an optical recording information writing device for writing data on an optical recording medium. A plurality of optical recording media are placed on the same circumference of the rotating disk, and the writing head writes data on each optical recording medium in the circumferential direction. It is characterized in that it is configured to write.

Further, the second invention of the present application is one in which various correction means are added in order to roughly improve the accuracy of the first invention, and in addition to the above-mentioned configuration, the second invention includes the following: An arc-shaped trajectory,
a writing position correction means for displacing the writing head in a radial direction to create a substantially linear trajectory;

The write timing and write pulse width correspond to the position of the head from the center of the rotating disk to compensate for the deviation in write pitch and the size of the write bit cell caused by the rotation of the rotating disk and the linear motion of the write head. and write timing correction means for correcting by changing the timing.

[Function] As described above, the present invention uses a writing head to write data in the circumferential direction, eliminating movement in the X and Y directions and eliminating the need for precise control. Furthermore, since a plurality of optical recording media are arranged on the same circumference and data is written on them all at once, data can be written on a large amount of media at high speed.

Furthermore, according to the second invention of the present application, mechanical accuracy is converted into electrical signal timing, so the reliability of the entire device is improved.

That is, the writing position correction means displaces the writing head in the radial direction, so that the arcuate trajectory of the writing head caused by the rotation of the rotating disk becomes a substantially straight trajectory.

The write timing correction means changes the write timing and write pulse width in accordance with the position of the head from the center of the rotating disk, and adjusts the write pitch caused by the rotation of the rotating disk and the linear motion of the write head. The misalignment and the size difference of the write bit cells are corrected to the normal pitch and size on the optical recording medium.

[Example] An example of the present invention will be described with reference to the drawings. In addition, in the following examples, an example using an optical memory card as an optical recording medium will be shown.

<Configuration of Embodiment> FIG. 1 shows an outline of the configuration of an embodiment of the optical recording information writing device of the present invention.

The basic configuration of the embodiment shown in the figure includes a rotating disk 10 on which a plurality of optical memory cards C are arranged and mounted on the same circumference, and a rotary disk 10 arranged on the rotating disk 10 so as to be movable in the radial direction. A write head 18 that writes data to the optical memory card C, a voice coil motor 20 that moves the head in the radial direction, and drive control of the motor 20 to set the write head 18 at a predetermined position in the radial direction. A write head position control unit 22 that sends data to be written to the write head 18 and a write head position control unit 22 and a write timing correction unit 34 that sends a signal specifying a track to be written. and a built-in data control unit 36.

Additionally, this embodiment includes a writing position correction means 30 for correcting an arcuate trajectory caused by the relative circular motion of the writing head 18 into a linear trajectory, and a writing pitch of the writing data. It also includes a write timing correction means 34 that corrects the pulse width so that data can be written to the optical memory card C with a normal write pitch and pulse width, and a focusing means 28.

The position where the optical memory card C is to be placed is set in advance on the rotary disk 10. That is, as shown in FIG. 2, the optical memory cards C are arranged with one side of the radius at a predetermined interval. Also, this rotating disk 1
A marker M for detecting the position of the card C is provided on the outer periphery of the optical memory card C at the intersection with the radius where one side of the optical memory card C is located. This marker M is formed by appropriate means such as magnetic or optical.

As means for detecting this marker M, a card position detection section 28 is provided. This detection section 26 includes a sensor 24, and when it detects the marker M, sends the detection signal to the write timing correction means 34. Note that the sensor 24 is selected depending on the aspect of the marker M.

For example, if the marker M is an optical mark, it is constituted by a photoelectric detector.

The rotating disk 10 is rotationally driven by a servo motor 2. The servo motor 12 is also provided with a rotary encoder 14, which detects the rotation angle. Further, a servo motor control section 16 is provided, which rotates the servo motor 12 at a constant angular velocity in accordance with the angle signal.

The write head 18 includes, for example, a semiconductor laser, and records the data by providing holes or the like in a track at a predetermined position of the optical memory card C in accordance with the digital data to be supplied.

Note that in order to ensure the distinction between "O" and "l" when recording data, an FM encoding method may be adopted.

The write head position control unit 22 is connected to the write data control unit 3.
6 to drive the voice coil motor 20 to move the write head 18 in the radial direction;
Set to the position of the track to be written.

The writing position correction means 30 may take various forms;
In this embodiment, a photoelectric detector 32 is provided, and this photoelectric detector 32 is connected to the writing radar 18 and is moved by the voice coil motor 2o. Further, the charge detector 32 is set so that its field of view faces the back side of the rotating disk IO. As shown in FIG. 3, on the back side of this rotating circle @10, a reference mR is placed at a position corresponding to the position where the optical memory card C on the front side is placed and perpendicular to the radius.
is provided.

The writing position correction means 30 outputs a signal for moving the writing head 10 in the radial direction to the writing head position control unit 22 according to the output of the photoelectric detector 32, so that the photoelectric detector 32 , the reference line R is controlled so as to always be within the field of view.

The write timing correction means 34, as shown in FIG.
A write start signal output unit 38 that determines the start of writing based on the detection signal from the card position detection unit 26, a register 40 that holds the track designation signal from the write data control unit 36, and the rotary encoder 14. a rotation angle detection section 42 that detects a rotation angle from a signal of the above, the write start signal output section 38, a register 40, and a rotation angle detection section 4.
a write control circuit 44 which changes the write timing and write pulse width of the write head IO in response to the output signal of the write head IO; The shift register 48 sequentially sends data to the write head.

The focusing means 28 acts on the optical system of the writing head 18 to accurately focus the writing light beam.

<Operation of the embodiment> In the above configuration, the operation when writing data to the optical memory card C will be explained.

First, a plurality of cards C on which data are to be written are placed at predetermined positions on the three-rotation disk 10. In this case, as shown in FIG. 2, the end of the card C on the data storage side is
match the radius of

A rotating disk 10 is rotated by a servo motor 12. Along with this rotation, the placed card C moves on the circumference. Write in this state.

In writing, first, data to be written is sent from the write data control section 36 to the shift register 46 of the write timing correction means 34. At the same time, a signal (track number) specifying the track on which the data is to be written is sent to the write head position control section 22 and the register 40.

In response to this signal, the write head position controller 04 section 22 performs
The voice coil motor 20 is driven to move the write head 18 in the radial direction and set it at the position of the track to be written, that is, the initial position of track number 0. Note that if the writing start position is not track number O, it is set to the position of the track number.

On the other hand, the position of the card C to be written is detected by detecting the marker M by the sensor 24.

When the marker M is detected, the detection signal is sent from the card position detection section 2B to the write start signal output section 3B of the write timing correction means 34. At the same time, the rotation angle information of the rotary disk IO is sent from the rotary encoder 14 to the rotation angle detection section 42.

When the write start signal output unit 38 receives the marker M detection signal, it outputs a write start signal. Write control z.

In response to this, 44 serially sends the data stored in the shift register 4P to the write head 18. The timing of this transfer and the width of the 1-bit digital signal constituting the data are controlled by the write control section 44.

In this way, data is written one bit at a time, and when one track worth of data has been written, the write head 18 moves to the next card C. Then, in exactly the same manner as above, the same data is written, although it is also possible to write other data.

Tracks arranged on the same circumference of all cards (e.g. #
0), the rotary encoder 14 sends information to the write data control unit 3B that the rotation circle filO has rotated once.

In response to this, the write data control section 36 sends the next write data to the write timing correction means 34 and also instructs a line feed. In other words, the signal indicating the next track number is
to register 40 and write head position control section 22.

In response to this, the write head position control unit 22 drives the voice coil motor 20 to send the write l\rad 8 by one track in the radial direction. On the other hand, in the write timing correction means 34, the next +7) data is sent to the shift register 46, and this data is serially transferred by the write control section-44.

As described above, in this embodiment, for a large number of optical memory cards C, data can be written by simply moving the write head sequentially in the radial direction corresponding to the track to be written while keeping the rotary disk 10 rotating at a constant angular velocity. can be written. Therefore, positioning is easy, the device is simple, and a large amount of data can be transferred to many cards in a short time.
Can be written automatically.

By the way, when data is written by the write head 18, the locus of the written bit cell should be linear, as shown by the broken line L2 in FIG. However, in reality, the head 18 and the rotation circle g! Due to the relative movement with respect to 10, the locus of the written bit cell becomes arcuate as shown by the row of small circles Ll in FIG. This arc-shaped trajectory of the bit cell has a small radius of curvature when the position where the card C is placed is small.
Afterwards, in the read head that reads data from the card,
If it is within the readable range, it is allowed as is.

However, there are cases where this arc-shaped locus of the bit cell cannot be ignored, and in that case, correction is required.This embodiment provides a correction means for this purpose.Next, this correction effect will be explained. .

In this embodiment, as shown in FIG.
A reference line R is provided at a position corresponding to the installation position of the card C. This reference line R is detected by a photoelectric detector 32.

The writing position correction means 30 uses this output and the photoelectric detector 32
compares the output when looking at the reference &1itR at the standard position of the field of view, detects the deviation, and sends this deviation signal to the write head position control section 22. Write head position control section 22
In response to this, the voice coil motor 20 is driven so that the deviation becomes 0, and the radial position of the writing head is changed, and the photoelectric detector 3 connected thereto is driven.
Change the position of 2.

As a result, the photoelectric detector 32 moves relatively along the reference line R, and at the same time, the write/rad 18 also moves along the reference line R, as shown by the broken line in FIG.

The trajectory is a straight line as shown by L2. Therefore, data is written to each track on the card C linearly.

Although the above correction can turn an arcuate trajectory into a linear trajectory, there are cases where another type of correction is required.

That is, as the position of the track on the card C moves toward the inner circumference, the relative circumferential speed of the rotary disk 10 with respect to the writing head 18 becomes slower, and the trajectory that should originally be arcuate is corrected to develop linearly. This causes a deviation in the data writing timing and writing width with respect to the length direction of the track of the card C. If this deviation is not negligible, some kind of correction is required. In this case, a correction means is provided for this purpose.

This writing timing shift increases as the relative circumferential speed decreases, and the writing width increases toward the end of the track. Therefore, this correction is performed by detecting the "deviation" from the radial position of the track to be written on the rotating disk 10, the position of the writing head on the track, and the angular velocity of the rotating disk. It can be done.

Therefore, in this embodiment, the rotation angle is detected in the rotation angle detection section 42 of the write timing correction means 34, and the driver 2 number is detected in the register 40. In the integrated control circuit 44, data necessary for the above-mentioned correction can be obtained.

Then, based on this data, the write control circuit 44 corrects the send timing of the write data to perform the above correction. An example of this timing correction is shown in FIG.

As shown in the figure, both track #0 and track #l have their writing widths reduced toward the end of the track. This causes all bit cells to have equal widths when actually written on the card.

Further, the write timing of track #O on the outer circumferential side and track #1 on the inner circumferential side is delayed, for example, as in a and 2a for the latter. As a result, the write timing is delayed in accordance with the delay in relative speed, so that the bit cell positions are the same for all tracks.

As a result of this correction, data is accurately arranged in a matrix on the rectangular card C. Therefore, even if the reading sensor is a linear sensor such as a CCD linear sensor, accurate reading can be performed.

<Modification of Embodiment> In the above embodiment, a method of detecting the reference line using a photoelectric detector is adopted as the writing position correction means.
The present invention is not limited to this, but includes, for example, a method in which correction data is written on a rotating disk by magnetic means and read by a magnetic sensor;
It is also possible to calculate the position of 12 to write from the track number, rotation angle, etc. Also, correction data such as a reference line may be formed on the card. When the arcuate locus of is within the permissible range, this correction means may be omitted.

Next, in the above embodiment, as the write timing correction means, a method of calculating a correction value from data such as track position is adopted, but clock bits for synchronization are formed in advance on the card or rotating disk. The writing timing and writing width may be determined using this as a reference, and it goes without saying that this correction means can be omitted if no correction is required.

In addition, although the above embodiment includes a focusing means, it is also possible to omit this.

[Effects of the Invention] As explained above, the present invention can accurately write data using constant speed rotation control and radial positioning, eliminates precise movement control in the XY directions, and downsizes the device. In addition, it can be formed at low cost, data can be recorded on a large number of cards at high speed, and the price of data-recorded cards can be kept low.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of an embodiment of the optical recording information writing device of the present invention, and FIG. 2 shows the above embodiment. FIG. 3 is an explanatory diagram showing the position of the reference line provided on the back side of the rotating disc, and FIG. 4 is an explanatory diagram showing the position of the reference line provided on the back side of the rotating disc. FIG. 5 is a block diagram showing the configuration, FIG. 5 is an explanatory diagram showing the locus of relative motion between the writing head and the rotating disk, and FIG. 6 is a waveform diagram showing correction of write timing and writing width in data writing. . 10...Rotating disk 12...Servo motor 14...Rotary encoder! 6...Servo motor control unit 18...Writing head 20...Voice coil motor 22...Writing head position control unit 24...Sensor 26...Card position detection unit 28...Focusing Means 30...Write position correction means 32...Photoelectric detector 34...Write timing correction means 3B...Write data control section 38...Write start signal output section 40...Register 42...Rotation angle detection unit 44...Write control circuit 4B...Shift register C...Optical memory card M...Marker R...Reference line Applicant Computer Service Co., Ltd. Agent Patent attorney 3 Shina IwaoFigure 1Figure 2Figure 3Figure 4

Claims (2)

[Claims] (1) An optical recording information writing device for writing data on an optical recording medium, which includes a rotating disk, its rotation control means, and a writing head provided movably in the radial direction, wherein An optical recording information writing device characterized in that a plurality of optical recording media are placed on the circumference, and data is written in the circumferential direction on each optical recording medium using a write head. (2) An optical recording information writing device for writing data on an optical recording medium, comprising a rotating disk, a rotation control means thereof, and a writing head provided movably in the radial direction, the writing head being provided in the same circle as the rotating disk. A plurality of optical recording media are placed on the circumference, and a write head writes data on each optical recording medium in the circumferential direction. A writing position correction means for changing an arcuate trajectory into a substantially linear trajectory by displacing the writing head in the radial direction; and a writing pitch deviation caused by rotation of a rotating disk and linear motion of the writing head. and write timing correction means for correcting the difference in size of the write bit cell by changing the write timing and write pulse width in accordance with the position of the head from the center of the rotating disk. An optical recording information writing device characterized by: