JPS58100235A - Information recording disk and its character recording system - Google Patents

Abstract

PURPOSE:To perform speedy, secure recording of high quality by recording characters, etc., through modulated light exposure. CONSTITUTION:A signal which corresponding to characters, symbols, etc., synchronizing with the rotation pitch of a dot matrix type photosensitive disk 1 which rotates at a constant speed is applied by a character generator 10 controlled through a control computer system 11, a parallel-series conversion shift register 9, a signal generator 8, etc., and an optical modulator 5 generates a laser beam modulated corresponding to the signal. By this beam, characters, symbols, etc., used for a label, etc., are recorded optically on the photosensitive disk 1 to perform speedy, secure recording of high quality as compared with the use of stamps, handwriting, etc.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an information recording disk and its character recording method, in which characters, etc. are recorded on the surface of a photosensitive disk by exposure, and the characters are of high quality and can be recorded with high precision in a short time. The purpose is to provide an information recording disk and its character recording method.

Video discs or digital audio discs generally have disc numbers, letters, symbols, etc. recorded between the information signal recording part and the Leve (1) layer part, and disc handlers must The recorded contents of the disc can be identified by visually observing the disc. Conventionally, these numbers and symbols were recorded by handwriting or stamping after developing a glass master disk on which information signals were recorded to obtain a metal replica.
Character quality is low, it is difficult to know the contents of the disc during many processes, it is necessary to pay close attention to handling, and furthermore, it is susceptible to dust and damage. Furthermore, there is a drawback that recording requires a lot of time.

The present invention eliminates the above-mentioned drawbacks, and an embodiment thereof will be described below with reference to the drawings.

FIG. 1 shows a block system diagram for explaining one embodiment of the character recording method of the information recording disk according to the present invention. In the figure, reference numeral 1 denotes a glass master disk coated with a photosensitive agent (hereinafter referred to as a photosensitive disk), which is rotated at a constant speed by a rotating device i2. The exposure level of the laser beam from the laser generator 4 is controlled by the optical modulator 5 (2), and then condensed by the condenser lens 6, and irradiated onto the surface of the photosensitive plate 10 to expose it. 10 is a character generator, and a control computer system (hereinafter referred to as MPU)
In response to a control signal from 11, data in which characters, symbols, etc. necessary for recording are subdivided into a matrix of, for example, 7 rows by 5 columns is extracted.

Now, as shown in FIG.
The case of recording the character J will be explained. When the keyboard 12 is operated, a control signal corresponding to the character "A" is supplied from the MPU 11 to the character generator 10, and 8-bit parallel data, for example, is extracted from the character generator 10.

On the other hand, the rotation synchronization pulse generator 17 generates a rotation synchronization pulse a1. l12
+... is generated, the number of pulses a is counted in the divider 18, and the row address generator 19 outputs
A row selection address signal is supplied every 01 rotations. In response to a row selection address signal for, for example, the first row (first rotation) from the row address generator 19, dot data (parallel 8 bits) for the first row of characters is taken out from the character generator 10. On the other hand, FIG. 6 from the clock generator 13 (
The clock pulse C shown in C) is frequency-divided by the frequency divider 14 to become the signal d shown in CD) in the same figure, and the clock pulse C shown in the frequency divider 15 and parallel/
It is supplied to a serial conversion shift register (hereinafter referred to as shift register) 9. The first row of data taken out from the character generator 10 is converted to serial data in the shift register 9, and the character "A" is subdivided into squares in mZ rows and Xn5 columns as shown in FIG. The signal e corresponding to the area m1n1 *m + n 5 in the first row
N l 015 (FIG. 5(g))) is extracted.

For example, a high frequency signal from the signal generator 8 is gated by the signals 8 and e from the shift register 9 and is then gated 11.
15, a burst signal is extracted, the signal from the laser generator 4 is optically modulated by the signal from the signal generator 8 in the optical modulator 5, and is transmitted to the surface of the photosensitive plate 10 via the condenser lens 6. irradiated. As a result, the position corresponding to the first row (first rotation) on the surface of the photosensitive plate 10 is exposed by the laser beam, and as shown in FIGS. 2 and 4, the area m +
n 1 * m and n 5 are recorded.

When the recording of the first line of the character "A" is completed, a signal is taken out from the frequency divider 15 which counts the pulses d of the frequency divider 14, and is sent to the character update pulse generator 16 as shown in FIG.
The update pulse b shown in B) is used to update the control character contents of the MPU 11. As a result, the first line of the characters (explanation omitted in this example) recorded next to "A" is the above "A".
It is recorded in the same way as in the case of .

When the first line of characters recorded in the area 1C of the photosensitive disk 1 is recorded in the first rotation, the photosensitive disk 1 is moved to the right side in FIG. 1 with respect to the beam spot by the transfer device 5. At the same time, the rotation synchronization pulse a2 for the second rotation is taken out from the rotation synchronization pulse generator 17, and the row selection address signal for the second row (5) (second rotation) is taken out from the row address generator 19. Then, the second line dot pattern of the character rAJ is extracted from the character generator 10. Similarly to the above case, from the shift register 9, the area m2n11 shown in FIG.
Signal e2+1”25 corresponding to m2n5 (Fig. 6 @))
is taken out, and an area m2n1. m2n6 is recorded.

Thereafter, in the same manner, the 100 row address data of the character generator is updated by the row selection address signal every rotation, and in the third rotation, the area m 5 n 1 + m3n
Signals 851 to 55 corresponding to 2+ m5nx, + m3n4 + m5ns (Fig. 5 (g)), signal eA11 corresponding to area m4n11m4n5 at the 4th turn
e45 ((C) in the same figure), area m5 at the 5th rotation
Signal e51°e5. corresponding to n1 h m5n5. (■ in the same figure), the area m6n2+m 6 I at the 6th rotation
]4 corresponding to the signal e621 ``64 (■ in the same figure)),
At the 7th rotation, the signal e corresponding to the area m 7 n 5
73 ((F) in the same figure) is taken out. As a result, the letter "A" shown in FIGS. 2 and 4 is finally recorded by 7 (A) rotations.

The size of the characters is, for example, about 2 to 6 squares.

During the recording operation, the rotation synchronization pulse a from the rotation synchronization pulse generator 17 is supplied to the clock generator 13, synchronized with the clock pulse 01 row selection address signal and the control signal from the MPU 11, and recorded on the photosensitive disk 1. It is constructed so that the characters are recorded accurately so that they do not shift from line to line.

When adjusting the size of the characters, for example in the height direction, the division ratio of the frequency divider 18 is varied and the row selection address signal of the row address generator 19 is changed to the same data from the character generator 10 for two rows at a time. At the same time, in the horizontal direction, the division ratio of the frequency divider 14 is varied to vary the frequency at which data is extracted from the shift register 9, and the switching timing of column data is adjusted. do it. Furthermore, by varying the frequency division ratio of the frequency divider 15 to vary the period of the output pulse b of the update pulse generator 16, the interval between each character can be adjusted.

Further, the signal generator 8 may be configured, for example, by a circuit that FM modulates the video signal using the signal from the shift register 9 and extracts it. In this case, the exposure level of the optical modulator 5 is set to 8, characters can be recorded on the photosensitive disk 1 with differences in shading.

Furthermore, instead of moving the photosensitive disk 1 every rotation, the position of the laser beam may be moved toward the inner circumference of the photosensitive disk 1.

Furthermore, if a laser generator and an optical modulator are provided for all rows m1 to m7, and each optical modulator is configured to be controlled by row dot data, all seven lines of characters can be 1
It can be exposed to light by rotation, and recording can be done in a shorter time than with a device that records a line every rotation.

As mentioned above, since the information recording disk of the present invention has characters, symbols, etc. recorded on the surface of the photosensitive disk by exposure, the characters, symbols, etc. are recorded by handwriting or stamping after passing through a metal replica. The quality of the characters is higher and more accurate than that of the previous ones, and the character recording method is
A light beam is modulated by matrix data of characters, symbols, etc., and the surface of a photosensitive plate rotating at a constant speed is exposed concentrically or spirally in synchronization with the rotation pitch using this modulated light beam to produce characters, etc. The quality of the characters is higher than that recorded by handwriting or stamping after development and metal replicas, and high precision can be obtained in a short time. If two systems are prepared, character recording can be performed at the same time as information signal recording, and information signal recording and character recording can be created in a shorter time than if they are performed in separate processes. If these steps are performed separately, only one laser light source is required, and since characters can be recorded in the same process as information signal recording, the contents of the disc can be easily transmitted. It has the advantage that it is easier to handle than the conventional method, and that it is free from dust and damage, and high-quality disks can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a block system diagram for explaining one embodiment of the character recording method of the information recording disc according to the present invention, and FIG. 2 is a schematic perspective view of the main parts of one embodiment of the information recording disc according to the present invention. ,
Fig. 6 4-(3) are signal waveform diagrams for explaining the operation of the method of the present invention, Fig. 4 is a diagram in which the characters to be recorded are mapped into IJ boxes,
FIG. 5 IA)-CF) is a signal waveform diagram for explaining the operation of the system of the present invention. DESCRIPTION OF SYMBOLS 1... Glass master coated with photosensitive agent, 1c... Character recording area, 2... Turntable rotation device, 3... Turntable transfer device, 4... Laser generator, 5...
- Light modulator, 6... Condensing lens, 8... Signal generator, 9... Parallel/serial conversion shift register, 10... Character generator, 11... Control computer system, 12...・Input keyboard, 13... Clock generator, 14, 15. 18... Frequency divider, 16
. . . Update pulse generator, 17 . . . Rotation synchronization pulse generator, 19 . . . Row address generator.

Claims (1)

[Scope of Claims] (υ Information recording disc characterized by having characters, symbols, etc. recorded on the surface of a photosensitive disc by exposure. (2) Characters, symbols, etc. to be recorded are masked) IJ film A light beam is modulated according to data, and the surface of a photosensitive disk rotating at a constant speed is exposed concentrically or spirally in synchronization with the rotation pitch using the modulated light beam to record the characters, symbols, etc. Characteristic character recording method of information recording disc.