JPH05797B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an information recording disk and its character recording method, and includes exposing characters, etc. for identifying recorded contents to an area between an information signal recording area and a label area on the surface of a photosensitive disk. An object of the present invention is to provide an information recording disc and a character recording method thereof, which can be recorded with high character quality and with high accuracy in a short time.

Generally, a video disc or digital audio disc has a disc number, characters, symbols, etc. recorded between the information signal recording part and the label part, and the person handling the disc must visually check the numbers, symbols, etc. The recorded contents of that disk are identified by 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, resulting in poor character quality and requiring many steps. It is difficult to know the contents of the disk over a long period of time, the disk must be handled with great care, it is susceptible to dust and damage, and it takes a lot of time to record. There were drawbacks such as:

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 2 . After the exposure level of the laser beam from the laser generator 4 is controlled by the optical modulator 5, it is focused by the condensing lens 6, and is irradiated onto the surface of the photosensitive plate 1 to expose it to an information signal. At the same time, characters and symbols are also recorded. Reference numeral 10 denotes a character generator, which uses control signals from the control computer system (hereinafter referred to as MPU) 11 to generate characters and symbols necessary for recording, for example, in 7 lines x 5.
It is configured to extract data segmented into a matrix of rows.

Now, as shown in FIG. 2, the case where the letter "A" is recorded in the area 1c between the information signal recording section 1a and the label section 1b on the photosensitive disc 1 will be described. When you operate the keyboard 12,
A control signal corresponding to the letter "A" is supplied from the MPU 11 to the character generator 10, and 8-bit parallel data, for example, is taken out from the character generator 10.

On the other hand, the rotation synchronization pulse generator 17 generates a rotation synchronization pulse as shown in FIG.
a ₁ , a ₂ , . . . are generated, the number of pulses a is counted in the frequency divider 18, and the number of pulses a is
A row selection address signal is taken out from the photosensitive plate 1 every rotation and supplied to the character generator 10. For example 1 from row address generator 19
By the row selection address signal of the row (first rotation),
Dot data (parallel 8 bits) of the first line of characters is taken out from the character generator 10. On the other hand, FIG. 3C from the clock generator 13
The clock pulse c shown in FIG. 1 is frequency-divided by a frequency divider 14 to become a signal d shown in FIG. The first row of data taken out from the character generator 10 is converted to serial data in the shift register 9, and the letter "A" is subdivided into a matrix of m7 rows and n5 columns as shown in FIG. The area m ₁ n ₁ in the first row,
Signals e ₁₁ and e ₁₅ (Fig. 3E) corresponding to m ₁ n ₅ are taken out.

From the signal generator 8, for example, a high frequency signal is gated with the signals e ₁₁ and e ₁₅ from the shift register 9 to obtain a burst signal, and the signal from the laser generator 4 is sent to the optical modulator 5. The light is modulated by a signal from the signal generator 8 and is irradiated onto the surface of the photosensitive disk 1 via the condenser lens 6 . As a result, the position corresponding to the first row (first rotation) on the surface of the photosensitive plate 1 is exposed to the laser beam, and the second
As shown in FIG. 4, areas m ₁ n ₁ and m ₁ n ₅ are recorded.

When the recording of the first line of the letter "A" is completed, the frequency divider 15 counts the pulse d from the frequency divider 14.
A signal is extracted from the character update pulse generator 16 and generated as an update pulse b shown in FIG. 3B, thereby updating the control character contents of the MPU 11. As a result, the first line of the characters (description omitted in this embodiment) to be recorded next to "A" is recorded in the same manner as in the case of "A" described above.

When the first line of characters recorded in the area 1c of the photosensitive disk 1 is recorded in the first rotation, the transfer device 3 moves the photosensitive disk 1 to the right side in FIG. 1 with respect to the beam spot. 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 rotation synchronization pulse _a2 for the second rotation is taken out from the row address generator 19.
The row selection address signal of the row (second rotation) is taken out and the character "A" is output from the character radiator 10.
The dot pattern in the second row is extracted. Similarly to the above case, the shift register 9 outputs the signals e ₂₁ , corresponding to the areas m ₂ n ₁ , m ₂ n ₅ shown in FIG.
e ₂₅ (Fig. 3 E) is taken out, and an area m ₂ n ₁ is formed at the position corresponding to the second row (second rotation) of the photosensitive plate 1 (that is, on the inner circumferential side with respect to the position of the first row). , m ₂ n ₅ are recorded.

Thereafter, in the same manner, the row address data of the character generator 10 is updated by the row selection address signal every rotation, and the area
Signals corresponding to m ₃ n ₁ , m ₃ n ₂ , m ₃ n ₃ , m ₃ n ₄ , m ₃ n ₅
e ₃₁ to _{e 35} (Fig. 5B), the area at the 4th rotation
Signals e ₄₁ , e ₄₅ corresponding to m ₄ n ₁ , m ₄ n ₅ (C in the same figure), 5
Signals corresponding to areas m ₅ n ₁ and m ₅ n ₅ at the rotation point
e ₅₁ , e ₅₅ (D in the same figure), area m ₆ n ₂ at the 6th rotation,
Signals e ₆₂ and e ₆₄ (E in the figure) corresponding to m ₆ n ₄ , and signal e ₇₃ (F in the figure) corresponding to the region m ₇ n ₃ at the seventh rotation are extracted. As a result, the letter "A" shown in FIGS. 2 and 4 is finally recorded in seven revolutions.
The size of the characters is, for example, about 2 to 3 mm square.

During the recording operation, the rotation synchronization pulse a from the rotation synchronization pulse generator 17 is supplied to the clock generator 13 to synchronize with the clock pulse c, the row selection address signal, and the control signal from the MPU 11.
It is constructed so that the characters recorded on the photosensitive disk 1 are accurately recorded without shifting from line to line.

Note that when adjusting the size of characters, for example in the height direction, the frequency division ratio of the frequency divider 18 is varied and the row selection address signal of the row address generator 19 is sent to the character generator 10 for two lines at a time. While adjusting so that the same data is retrieved from
In the horizontal direction, the frequency dividing ratio of the frequency divider 14 may be varied to vary the frequency at which data is taken out from the shift register 9, thereby adjusting the switching timing of column data. 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 with a circuit that outputs the video signal by FM modulating it with the signal from the shift register 9. In this case, the exposure level of the optical modulator 5 is set to the signal generator. 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, seven lines of characters can be printed. All of the exposure can be done in one rotation, and recording can be done in a shorter time than in the case where a row is recorded every one rotation.

As mentioned above, the information recording disk according to the present invention has characters, records, etc. recorded on the surface of the photosensitive disk by exposure, so it can be machined by stamping by hand or engraving after passing through a photo transfer method or a metal replica. The quality of the characters is higher and the precision is higher than that of the ones in which characters, symbols, etc. are recorded manually, and the character recording method modulates the light beam with data that is a matrix of characters, symbols, etc. A modulated light beam is used to expose the surface of a photosensitive disk rotating at a constant speed in a concentric or spiral manner in synchronization with the rotation pitch, thereby exposing the area between the information signal recording area and the label area on the surface of the photosensitive disk. Because characters are recorded to identify the recorded content, the quality of the characters is higher than that recorded by handwriting or stamping after development and metal replicas. Accuracy can be obtained, and if two systems of laser light sources are prepared, characters can be recorded at the same time as information signals are recorded, and information signal recording and character recording can be created in a shorter time than if they were performed in separate processes. Also, if information signal recording and character recording are performed separately, only one laser light source is required;
Since characters can be recorded continuously in the same process as recording information signals, the contents of the disc can be easily recognized.
This method is easier to handle than the conventional method of recording after obtaining a metal replica, and is also free from dust and damage, making it possible to obtain high-quality discs. I can do it.

In addition, since characters, symbols, etc. for identifying the recorded content are recorded in the area between the information signal recording area and the label area, the non-recording area between the information signal recording area and the outermost edge of the information recording disc is Compared to other information recording discs that record characters, symbols, etc. in the area, the recording area for characters, symbols, etc. is located further inside the disk, so
Since the inspection time for visually checking the presence of characters, symbols, etc. can be shortened, the inspection efficiency can be increased.

Furthermore, compared to a recording method in which the recording of information signals and the recording of characters, symbols, etc. are performed in separate processes, a specific information signal is Since it can be recorded, it is possible to completely prevent mix-ups of characters, symbols, etc. or information signals that may occur during movement between processes.
Similarly, since specific characters, symbols, etc. can be recorded consecutively to information signals that uniquely correspond to characters, symbols, etc., it is possible to completely prevent mix-ups of information signals, characters, symbols, etc. To completely eliminate damage, scratches, etc. to the recording disk that may occur when moving the recording disk between processes such as when taking it out from the disk, transporting it, installing it in another process, and adjusting positioning. Therefore, the yield of information recording disk production can be improved.

In addition, since there is no need to move between processes, the information recording disk can be handled easily, resulting in improved workability.

[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 disk according to the present invention, and FIG. 2 is a schematic perspective view of the main parts of one embodiment of the information recording disk according to the present invention. , FIGS. 3A to 3E are signal waveform diagrams for explaining the operation of the method of the present invention, FIG. 4 is a matrix diagram of characters to be recorded, and FIGS. be. 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, 1
5, 18... Frequency divider, 16... Update pulse generator, 17... Rotation synchronization pulse generator, 19... Row address generator.

Claims (1)

[Claims] 1. Characters, symbols, etc. for identifying the recorded content are recorded continuously on the recording of the information signal in the area between the information signal recording part and the label part on the surface of the photosensitive disc. An information recording disc featuring: 2. A light beam is modulated by matrix data of characters, symbols, etc. to be recorded, and the modulated light beam is irradiated onto the surface of a photosensitive disk rotating at a constant speed in synchronization with the rotation pitch, thereby creating a pattern on the surface of the photosensitive disk. A character recording method for an information recording disc, characterized in that characters, symbols, etc. for identifying the recorded content are recorded continuously in the recording of the information signal in an area between the information signal recording part and the label part.