JP4356735B2 - Optical disc drawing data generating apparatus, optical disc drawing system and program - Google Patents

Description

  The present invention relates to a technique for drawing an optical disc image.

  There is an optical disk drawing apparatus in which an image drawing function for drawing images such as characters and figures is added to a recording function for recording data on an optical disk such as a CD-R (Compact Disc Recordable). In recent years, a visible image recordable disc provided on the label surface side is used separately from a recording layer for recording data on a drawing layer that changes color when irradiated with laser light. By drawing an image, it is also possible to visually recognize the image from the label surface side.

In order to realize this technique at low cost, for example, Patent Document 1 discloses a technique that uses the same encoder as that used when recording data when converting image data into a signal for drawing an image on an optical disk. .
JP 2004-355664 A

  Incidentally, in recent years, a DVD (Digital Versatile Disc) has been used as an optical disc that can increase the amount of information to be stored. The encoder in Patent Document 1 is premised on the use of EFM (Eight to Fourteen Modulation) modulation used in a CD encoder, but the DVD encoder uses 8-16 modulation. When the technique disclosed in No. 1 is used for a DVD as it is, there is a problem. For example, as disclosed in Patent Document 1, when data corresponding to white and black of an image is determined, the encoded signal may be the same in DVD encoding, and white and black may be the same. The signal could not be identified.

  The present invention has been made in view of the above circumstances, and an optical disk drawing data generation device that generates image data capable of discriminating white and black signals even in 8-16 modulation used in a DVD encoder, An object is to provide an optical disk drawing apparatus and a program.

  In order to solve the above-described problems, the present invention includes an encoder that is used for data recording and generates an encoded signal based on a conversion table and a conversion algorithm for input data, and an optical disc based on the signal To the optical disk drawing apparatus for generating the drawing signal based on the inputted drawing data, identifying black and white of the image from the drawing signal, and drawing the image on the optical disk based on the drawing signal, An optical disk drawing data generation device for supplying the drawing data, a storage unit for storing the conversion table and the conversion algorithm, a determination unit for determining binary values corresponding to each of the black and white of the image, and the image Replacement means for generating the drawing data by replacing each of the monochrome data with the binary value determined by the determination means; A signal pattern generation unit that generates a signal pattern corresponding to each of the binary values based on a conversion table and a conversion algorithm stored in the storage unit, and outputs the signal pattern to the optical disc drawing apparatus; When the drawing data generated by the replacement unit is encoded by the encoder and a drawing signal is generated, the determining unit is configured so that the optical disk drawing device extracts a portion corresponding to the black and white from the encoded drawing signal. Provided is an optical disk drawing data generation device characterized in that binary values are determined based on a conversion table and a conversion algorithm stored in the storage means so that they can be identified by a signal pattern.

The present invention also includes an encoder that is used for data recording and generates a signal that is encoded based on input data based on a conversion table and a conversion algorithm, and records data on an optical disc based on the signal. , an optical disk image forming system for drawing an image on the optical disk based on the drawing signal generated by the drawing data to the encoder is input, a storage means for storing a pre-Symbol conversion table and the conversion algorithm, wherein Determining means for determining binary corresponding to each of monochrome of the image; replacement means for generating the drawing data by replacing each of the monochrome data of the image with the binary determined by the determining means; and the storage means On the basis of a conversion table and a conversion algorithm stored in the Signal pattern generating means for generating an image, and identifying means for identifying a portion corresponding to the black and white from the drawing signal generated by the encoder by the signal pattern, wherein the determining means includes the identifying means A binary value is determined based on a conversion table and a conversion algorithm stored in the storage means so that a portion corresponding to the black and white can be identified by the signal pattern from a drawing signal generated by an encoder. An optical disc drawing system is provided.

  The present invention also includes an encoder that is used for data recording and generates a signal that is encoded based on input data based on a conversion table and a conversion algorithm, and records data on an optical disk based on the signal. Generating a drawing signal based on the input drawing data, identifying black and white of the image from the drawing signal, and supplying the drawing data to an optical disc drawing apparatus that draws the image on the optical disc based on the drawing signal The storage means for storing the conversion table and the conversion algorithm, a determination means for determining binary values corresponding to each of the black and white of the image, and the determination means for determining each of the black and white data of the image Replacement means for generating the drawing data by replacing with binary values, a conversion table stored in the storage means, Based on a replacement algorithm, a signal pattern corresponding to each of the binary values is generated, and the optical disc drawing apparatus functions as a signal pattern generation unit that outputs the signal pattern. The determination unit is generated by the replacement unit. When the drawing data is encoded by the encoder and a drawing signal is generated, the storage means is configured so that the optical disk drawing apparatus can identify the portion corresponding to the monochrome from the encoded drawing signal by the signal pattern. There is provided a computer-readable program characterized in that binary values are determined based on a stored conversion table and conversion algorithm.

  According to the present invention, it is possible to provide an optical disc drawing data generation device, an optical disc drawing device, and a program for generating image data that can distinguish white and black signals even in 8-16 modulation used in a DVD encoder. it can.

  Hereinafter, an embodiment of the present invention will be described.

<Embodiment>
The optical disc drawing system 1 according to the present embodiment has a function of drawing an image that can be visually recognized by the user on the label surface side of the optical disc 100 with respect to the optical disc 100. In the following description, the optical disk 100 will be described first, and then the optical disk drawing system 1 will be described.

  An optical disc 100 according to the present embodiment is, for example, a DVD-R and is a visible image recordable disc that can be drawn on the label surface LS side. FIG. 1 is a cross-sectional view of a portion of the optical disc 100 where drawing is possible. As shown in FIG. 1, the cross-sectional structure of the optical disc 100 includes a polycarbonate layer 101, a drawing layer 102, a reflective layer 103, an adhesive layer 104, a reflective layer 105, data recording in order from the label surface LS to the data recording surface DS. A layer 106 and a polycarbonate layer 107 are laminated. The thickness of the optical disc 100 is about 1.2 (mm), of which the polycarbonate layer 101 and the polycarbonate layer 107 each occupy about 0.6 (mm), and from the drawing layer 102 to the data recording layer 106 The thickness is a minute distance d compared to the total thickness. A spiral groove (guide groove) 108 is formed on the recording surface DS side of the data recording layer 106.

  The drawing layer 102 and the data recording layer 106 are dye layers formed of a substance that changes color when irradiated with laser light having a predetermined intensity or higher. At the time of drawing, the laser beam is focused on the drawing layer 102 based on the reflected light from the reflective layer 103. When a laser beam having a predetermined intensity or higher is irradiated, the region of the drawing layer 102 irradiated with the laser beam changes color. An image that can be visually recognized by the user is formed by the discolored area and the undiscolored area. Similarly, at the time of data recording, the laser beam is focused on the data recording layer 106 based on the reflected light from the reflective layer 105, and data recording is performed along the groove 108. Note that reading out the recorded data is realized by irradiating laser light of a predetermined intensity that is weaker than that during recording along the groove 108 and detecting the intensity of the reflected light.

  Next, the optical disk drawing system 1 will be described. The optical disc drawing system 1 includes an optical disc drawing device 2 and a host device 3 that is an optical disc drawing data generation device.

  FIG. 2 shows the configuration of the optical disc drawing system 1 and shows in detail the configuration when the optical disc 100 is loaded in the optical disc drawing apparatus 2. In the optical disk drawing apparatus 2, the optical disk 100 is rotated by a spindle motor 11. The spindle servo 12 controls the rotation of the spindle motor 11 at a constant linear velocity during recording and reproduction (CLV control) and at a constant rotation speed during drawing (CAV control). The optical pickup 14 is transferred in the radial direction of the optical disc 100 (left and right in the figure) by a feed mechanism 16 such as a feed screw driven by a stepping motor 15 and irradiates the optical disc 100 with laser light 13. Then, a light reception signal based on the reflected light is output to each circuit of the optical disc drawing apparatus 2. The motor driver 17 drives the stepping motor 15 based on a command from the system control unit 19.

  The focus servo 18 controls the focus position of the objective lens of the optical pickup 14 by performing focus servo control during data recording, reproduction, and drawing.

  The tracking servo 20 performs tracking servo control of the optical pickup 14 during data recording and reproduction based on a command from the system control unit 19 and a light reception signal from the optical pickup 14. At the time of drawing, the tracking servo control is turned off. An ALPC (Automatic Laser Power Control) circuit 21 drives a laser diode of the optical pickup 14 at the time of data recording and reproduction and drawing based on a command from the system control unit 19 and a light reception signal from the optical pickup 14. Thus, the intensity of the irradiated laser beam 13 is controlled.

  The encoder 23 encodes data read from the buffer memory 24 (recording data at the time of data recording and drawing data at the time of drawing) based on a conversion table and a conversion algorithm to generate a drawing signal, and a writing signal generator 26. The write signal generator 26 converts the drawing signal into a write signal and outputs it to the ALPC circuit 21. At this time, at the time of drawing, the writing signal is output to the ALPC circuit 21 or the output is stopped based on the contents of the drawing signal. At the time of data recording, all write signals are output to the ALPC circuit 21. Details of the encoder 23 and the write signal generator 26 will be described later.

  The decoder 25 demodulates the received light signal from the optical pickup 14 during data reproduction by performing 8-16 demodulation, and transmits the data to the host device 3 through the interface 10.

  The host device 3 has a command for causing the optical disk drawing device 2 to execute one of data recording, data reproduction, and drawing, a command from an operator, other commands for controlling the optical disk drawing device 2, drawing data, and recording data. Are transmitted to the optical disk drawing apparatus 2. This command is transmitted to the system control unit 19 via the interface 10. Then, the system control unit 19 causes each circuit of the optical disc drawing apparatus 2 to perform a corresponding operation based on the transmitted command. Further, the host device 3 stores the drawing data of the image to be drawn on the drawing layer 102 on the label surface LS side or the recording data to be recorded on the data recording layer 106 on the data recording surface DS in the buffer memory 24 via the interface 10. To do. The drawing data or recording data is temporarily stored in the buffer memory 24, read out, and supplied to the encoder 23. Here, the drawing data is data generated by converting image data of an image drawn by the host device 3. Details of this conversion will be described later.

  Next, the encoder 23 will be described. FIG. 3 is a block diagram showing the configuration of the encoder 23. The encoder 23 includes a data frame forming unit 231, a scramble unit 232, an ECC block forming unit 233, a recording frame forming unit 234, and a physical sector forming unit 235.

  As shown in FIG. 4, the data frame forming unit 231 converts the data read from the buffer memory 24 into a data frame formed by collecting 12 rows of 172 bytes of data per row. One data frame includes 4-byte ID (Identification data), 2-byte IED (ID Error Detection Code), 6-byte RSV, 2048-byte Maindata, and 4-byte EDC (Error Detection Code). The ID has an area name and a sector number of data to be recorded. IED is ID error detection parity, RSV is system reservation data, and EDC is overall error detection parity. In Maindata, data read from the buffer memory 24 is arranged. Then, the data frame is output to the scramble unit 232.

  The scramble unit 232 scrambles the 2048-byte main data of the data frame, and changes the arrangement of the main data 2048 bytes. Then, the data is output to the ECC block forming unit 233.

  As shown in FIG. 5, the ECC block forming unit 233 converts the scrambled data frame into an ECC block having 208 rows of 182 bytes of data per row. This means that 16 scrambled data frames of 12 rows are combined into 192 rows, and 16 bytes of PO (Parity of Outer Code) is added to the last part of each column, that is, 16 rows of PO are added. Then, a 10-byte PI (Parity of Inner Code) is added to the last part of each row, that is, 10 columns of PI are added. The notation “B0, 171” indicates data in the 0th row (first row from the top) and 171st column (172th column from the left) in the ECC block. This position indicates D159 (160th byte) of Maindata of the first data frame before being scrambled. However, since it is actually scrambled, it is not always the same data. The ECC block formed in this way is output to the recording frame forming unit 234.

  As shown in FIG. 6, the recording frame forming unit 234 interleaves the ECC block and converts it into a recording frame having 13 rows of 182 bytes of data per row. This is formed by interleaving the PO16 rows of the ECC block by inserting one PO every 12 rows (the number of rows corresponding to the original data frame). As a result, the ECC block becomes 16 recording frames of 13 rows. The recording frame thus formed is output to the physical sector forming unit 235.

  The physical sector forming unit 235 adds a 32-bit SYNC code (SYNC0 to SY7) to each recording frame, performs 8-16 modulation, and converts one recording frame into a physical sector as shown in FIG. . Here, 8-16 modulation will be described. The 8-16 modulation converts 8-bit data (0 to 255) into 16-bit data based on a conversion table and a conversion algorithm. The conversion table includes a main table and a sub table. Each table has four states, states 1 to 4, and a next state for selecting a state at the time of the next conversion is set for each state of each data. The state at the time of the next data conversion of the SYNC code is determined to be 1 (the next state of the SYNC code is 1).

  A conversion algorithm will be described. Here, since the 8-16 modulation method varies depending on 8-bit data, each will be described step by step. First, when the 8-bit data is 0 to 87, the DSV (Digital Sum Value) absolute value of the 16-bit data of the main table and sub-table corresponding to the selected state is selected regardless of which state is selected. Select the smaller value to convert. The DSV is a combination of NRZI (Non Return to Zero Inversion) conversion, where “H” is “+1” and “L” is “−1”. is there. The NRZI conversion is a conversion in which the “H” state and the “L” state are switched when the data is “1”, and the state is maintained when the data is “0”. For example, when the 8-bit data is “253”, the 16-bit data in state 1 of the main table is “0000010100000001”, and when the first state is “L”, the signal is as shown in FIG. In this case, since there are 10 “L” and 6 “H”, the DSV is “−4”.

  Next, when the 8-bit data is 88 to 255, the selection method of 16-bit data varies depending on the state specified by the next state of the previous data. When the next state of the previous data is 2 or 3, the corresponding 16-bit data may be selected and converted. However, when the next state of the previous data is 1 or 4, two examinations need to be performed. First, when the data converted in the state 1 or 4 is connected following the previous conversion data, the run length (the number of consecutive 0s in 16-bit data) needs to be 2 or more and 10 or less. Here, if either state 1 or 4 does not satisfy the run length restriction, the state that satisfies the other run length restriction is selected. On the other hand, when both the states 1 and 4 satisfy the run length, the DSVs of the both are compared and the state having a smaller absolute value is selected. In this way, the data is sequentially converted to 16 bits.

  These physical sectors are output to the write signal generator 26 as drawing signals that have undergone NRZI conversion. Here, the portion “H” of the drawing signal corresponds to the portion that changes the color by irradiating the drawing layer 102 of the optical disc 100 with the laser beam 13. As described above, the encoder 23 encodes the drawing data and generates a drawing signal.

  Next, the write signal generator 26 will be described. FIG. 9A is a block diagram showing a configuration of the write signal generator 26. The write signal generator 26 includes a strategy circuit 261, an identifier (identification means) 262, a time axis expander 263, a gate circuit 264, and a switch SW. The strategy circuit 261 corrects the drawing signal and generates a writing signal. This correction is performed in order to change the color of the drawing layer 102 with an optimum shape when the laser beam 13 is irradiated to change the color.

  The switch SW is a switch that can be switched by being controlled by the system control unit 19 according to the situation. That is, the system control unit 19 controls the switch SW so that the strategy circuit 261 is connected (broken line) to the ALPC circuit 21 during data recording and is connected (solid line) to the gate circuit 264 during drawing.

  The discriminator 262 extracts a predetermined portion from the drawing signal, discriminates two types of signals for each 16-bit data, generates an identification signal indicating the discrimination result, and outputs it to the time axis expander 263. Here, the two types of signals indicate “white” and “black” of the image, and in the case of a signal indicating white, an identification signal is generated with an identification result “L”, and in the case of a signal indicating black, an identification result “H” To do. Further, the predetermined portion indicates other than the SYNC code, PO, PI and some other portions, and the predetermined portion and two types of signals to be identified are controlled by the system control unit 19. And an identification signal is not output except a predetermined part.

  Further, the predetermined portion will be described in detail. Of the physical sector, a data portion surrounded by a thick frame in FIG. 7 is shown. That is, in 91 16-bit data (referred to as a SYNC code string) connected to one SYNC code, it corresponds to PO in a SYNC code string including ID, IED, RSV, EDC, and PI and other SYNC code strings. A portion excluding the portion and the SYNC code is a predetermined portion. In terms of the data position of the physical sector shown in FIG. 7, in “Ba, b”, when a = 0, b = 91 to 171; when a = 1 to 10, b = 0 to 80, 91 to 171; In the case of a = 11, the part corresponding to b = 0-80 is a predetermined part.

  As shown in FIG. 10, the identification signal outputs an identification result (“H” or “L”) only for the same time as reading the 16-bit data of the physical sector. Then, 1782 (0 to 1781 in the figure) 16-bit data is identified from one physical sector.

  The time axis extender 263 is a first-in first-out buffer memory, and extends the identification result of the identification signal output from the discriminator 262 in the direction of the time axis so that the identification signal exists in areas other than a predetermined portion. A circuit control signal is generated. Specifically, as shown in FIG. 10, each identification result of the identification signal is output by performing a predetermined time axis extension. Here, 16-bit data of a physical sector (since the SYNC code is 32 bits, it is converted as two pieces of data) is composed of 2418 data, and a predetermined portion is formed of 1782 data. Therefore, as a predetermined time base extension, each identification result of the identification signal is extended by a time base of 2418/1784 times (about 1.36 times), so that the gate circuit control signal is a time when the identification signal is not output. However, the state of either “H” or “L” is assumed and output to the gate circuit 264.

  Based on the gate circuit control signal, the gate circuit 264 controls whether to output the write signal output from the strategy circuit 261 or stop the output. Specifically, as shown in FIG. 9B, the gate circuit 264 has an AND circuit 2641. When the gate circuit control signal is “H”, the write signal is output as it is, and “L ", Control is performed so that the output of the write signal is output as" L ". Therefore, at the time of drawing (the switch SW is in a solid line state in FIG. 9A), drawing is performed on the optical disc 100 based on the write signal only when the gate circuit control signal is “H”. On the other hand, at the time of data recording (the switch SW is in a broken line state), the write signal is continuously output regardless of the state of the gate circuit 264. In this way, drawing on the optical disc 100 is performed.

  Next, a description will be given of a portion corresponding to an optical disc drawing data generation device that converts image data to be drawn on the optical disc 100 from image data to drawing data in the host device 3. FIG. 11 is a block diagram showing a configuration of a part of the host device 3 that performs conversion from image data to drawing data. When the image data of the image to be drawn on the optical disc 100 input from the image data input unit 31 is color image data, the monotone conversion unit 32 converts the image data into monotone image data. If the input image is not a color image, no processing is performed. The polar coordinate conversion unit 33 performs polar coordinate conversion on the orthogonal coordinate system image data output from the monotone conversion unit, and converts the image data into polar coordinate system image data. This polar coordinate conversion is performed such that the center point of the optical disc 100 is the origin. This conversion facilitates the correspondence between the image and the data position (sector) when drawing on the optical disc 100.

  The gradation data converter 34 converts the image data into a predetermined gradation (34 gradations in the present embodiment). In order to express 34 gradations, it is expressed by 33 dots (monochrome) per pixel. Here, since drawing is performed by controlling the rotation speed to be constant (CAV control) at the time of drawing, the size corresponding to one dot is different between the inner and outer circumferences of the optical disc 100 as will be described later, and accordingly 1 The pixel size also varies. Therefore, the gradation data conversion unit 34 performs data conversion so that the difference in the size of one pixel is reflected. Note that when rendering is performed with a constant linear velocity (CLV control), since one pixel is the same, data conversion may be performed as it is. As a result, an image drawn on the optical disc 100 is represented by data of a combination of white and black dots.

  Here, the size of one pixel in the case of CAV control will be described. In this embodiment, since it is a DVD, the sector frequency is 676 Hz when the encoding speed is set to 1 × speed. This means that the time for drawing data of one physical sector on the optical disc 100 is 1.48 ms (= 1/676 Hz). Then, as described in the description of the classifier 262, 1782 black and white discrimination is performed per physical sector, that is, one physical sector includes data of 1782 dots (54 pixels). . Thereby, the time for drawing one dot is 830 ns (= (1/676 Hz) / 1788 dots). Since the rotation speed of the spindle motor is 2000 rpm in this embodiment, the time required for one rotation of the optical disk is 30 ms, so the number of dots per one disk rotation is 36138 (= 30 ms / ((1/676 Hz) / 1782 dots)), and the case of 34 gradations corresponds to 1095 pixels (= 36138 dots / 33).

  Here, since the length of one circle is 364.4 mm at a radius of 58 mm of the optical disc 100, the length of one pixel (in the sector (angle) direction of the optical disc) is 333 μm. On the other hand, since the length of one circle is 157.1 mm at the radius of 25 mm of the optical disc 100, the length of one pixel is 143 μm. Further, since the width of the pixel (in the track (radius) direction of the optical disk) corresponds to the track pitch, it is determined to be 0.74 μm in the case of DVD. Thus, in the case of CAV control, since the number of pixels is the same on both the inner and outer peripheral sides of the optical disc 100, the length of one pixel is different. In this way, the gradation data converter 34 converts the gradation into 34 gradations in consideration of the size of one pixel so that an image to be drawn on the optical disc 100 is represented by data of a combination of white and black dots. To do.

  Next, the data replacement unit 35 stores (storage means) a conversion table and conversion algorithm of 8-16 modulation performed by the encoder 23. Among the stored conversion tables, in the state 1 of the main table, lsb ( Among the 8-bit data corresponding to the 16-bit data whose Least Significant Bit (Least Significant Bit) is “1”, two values (binary values) are selected from the values of 88 to 255 and “white” is selected. Determines the value assigned to each “black” (determination means), generates replacement image data (replacement means) by replacing the data corresponding to “white” and “black” of the image data with the determined values, and descrambles The data is output to the conversion unit 36. In this embodiment, “253” is assigned to “white”, and “248” is assigned to “black”. Here, the 16-bit data corresponding to “253” is “0000010100000001”, and the 16-bit data corresponding to “248” is “0000100100001001”. In such a case, according to the conversion algorithm, the next state is 1 and the 8-bit data is 88 or more, so the state of the conversion table for the next conversion is selected as 1 or 4. However, since the 2 bits from the msb (Most Significant Bit) in state 4 are “01” or “10”, when the lsb is connected to the data of “1”, the run length is “0” or When “1” is set, state 4 is not selected due to the run length limitation, and state 1 is always selected. In this way, by analyzing the conversion table and the conversion algorithm and determining values to be assigned to “white” and “black”, even if 8-bit data of “white” and “black” is modulated by 8-16, One 16-bit data is converted so as to correspond one-to-one.

  Then, the data replacement unit 35 generates replacement image data in which the image data is replaced with “253” 8-bit data representing “white” and “248” 8-bit data representing “black”, and a descrambling conversion unit To 36. The data replacement unit 35 also receives information (16-bit data (signal pattern) converted by 8-16 modulation) indicating that “253” is assigned to “white” and “248” is assigned to “black”. The data is output (signal pattern generation means) to the system control unit 19 of the optical disk drawing apparatus 2 via the interface 37. Based on this information, the discriminator 262 of the write signal generator 26 discriminates between “white” and “black”.

  The descrambling conversion unit 36 generates drawing data by descrambling the image data output from the data replacement unit 35 and outputs the drawing data to the optical disc drawing apparatus 2 via the interface 37. Here, the descrambling is obtained by completely inverting the scramble process performed by the scramble unit 232 of the encoder 23 of the optical disc drawing apparatus 2. That is, the replacement image data subjected to the descrambling is processed so as to return to the original data arrangement of the replacement image data when scrambled by the scramble unit 232. As described above, the image data is converted in the host device 3 to generate drawing data. Here, the scramble process performed by the scramble unit 232 is performed on the entire MainData of the data frame. On the other hand, the predetermined portion which is image data in the drawing signal does not use the entire MainData. Therefore, when the descrambling is performed, dummy data that is not related to the image data necessary for constructing the image is used as data corresponding to MainData other than the predetermined portion. As this dummy data, any data of 8-bit data “0” to “255” may be used, and data other than the selected binary may be used.

  Next, an operation when the optical disc drawing apparatus 2 draws on the optical disc 100 will be described. First, the host device 3 sends an instruction for executing drawing on the optical disc 100 to the interface 10 of the optical disc drawing device 2, drawing data, and 8-bit data assigned to “white” and “black” of the drawing data. Information indicating 16-bit data when converted by 8-16 modulation is transmitted. Here, “253” is assigned to “white”, and “248” is assigned to “black”. The interface 10 outputs a command transmitted from the host device 3 to the system control unit 19 and accumulates drawing data in the buffer memory 24.

  Next, the optical disc 100 is loaded into the optical disc drawing apparatus 1. When the optical disk 100 is loaded, the spindle servo 12 is controlled by the system control unit 19 so as to control the spindle motor 11 at a constant rotational speed (CAV control). Then, the system control unit 19 controls the motor driver 17 and the focus servo 18.

  Next, the system control unit 19 controls the ALPC circuit 21 so that the laser beam 13 has the drawing intensity (intensity at which the drawing layer 102 changes color). Further, the system control unit 19 assigns “253” to “white” and “248” to “black” to the discriminator 261 of the write signal generator 26, and “0000010100000001” after 8-16 modulation, respectively. , “0000100100001001” is output, and the switch SW of the write signal generator 26 is controlled to be switched so that the gate circuit 264 and the ALPC circuit 21 are connected.

  Next, the drawing data stored in the buffer memory 24 is sequentially read, and the encoder 23 encodes the drawing data to generate a drawing signal, and outputs the drawing signal to the writing signal generator 26. When the physical sector forming unit 235 of the encoder 23 forms a physical sector, the next to the SYNC code is state 1, and both “253” representing “white” and “248” representing “black” of the drawing data are both 8- When 16 modulation is performed, the conversion table state used at the time of the next conversion is always selected as data that becomes 1. Therefore, after 8-16 modulation, “253” is always changed to “0000010000100001” and “248”. "Is always modulated to" 0000100100001001 ". As described above, in the normal 8-16 modulation, even if the next state is 1 depending on the DSV, the state of the conversion table at the next conversion may be 4, but lsb is “1”. In this case, since state 4 cannot be selected because of the run length limitation, state 1 is always selected.

  The drawing signal generated in this way is such that the absolute value of the DSV of the entire signal becomes small due to the feature of 8-16 modulation. The run length is limited to 2-10. Therefore, if the drawing signal is extracted with a certain length, the signals of “H” and “L” are approximately 50% regardless of where they are extracted.

  Next, the discriminator 262 of the write signal generator 26 indicates the discrimination result from a predetermined portion of the drawing signal based on the information for discriminating between “white” and “black” output from the system control unit 19. When a “white” signal is detected, an identification signal “L” is generated, and when a “black” signal is detected, an identification signal “H” is generated and output to the time base expander 263. Here, as shown in FIG. 10, when the drawing signal is input to the discriminator 262, the discriminator 262 generates the discriminating signal while discriminating the signal, so that the discriminating result is output after a predetermined time. ing. In parallel with this, the drawing signal input to the strategy circuit 261 is converted into a writing signal.

  The time axis expander 263 generates a gate circuit control signal that extends the signal even in a portion where there is no identification signal by performing time axis expansion of the input identification signal by 2418/1784 times for each identification result. As shown in FIG. 12, when the gate circuit control signal is “H”, the gate circuit 264 outputs the write signal as it is to the ALPC circuit 21, and when the gate circuit control signal is “L”, the write signal is written. The signal is output to the ALPC circuit 21 as “L”. Then, the ALPC circuit 21 controls the laser driver 22 when the write signal is “H”, irradiates the optical disc 100 with the laser beam 13 and performs drawing. Here, the identification signal is output with a timing later than the drawing signal, and the correspondence between the identification result and the drawing signal (same for the writing signal) is shifted due to the time axis expansion. However, as described above, no matter where the drawing signal is extracted, the signals of “H” and “L” are approximately 50% each, and even if the run length restriction is considered, 11 or more “0” s continue. Therefore, the write signals are not all “L” during the period when the gate circuit control signal is “H”. In addition, although the run length restriction is different in the portion corresponding to the SYNC code, there are never 14 or more “0” s, so the write signal is always “H” once during the period when the gate circuit control signal is “H”. " Therefore, even if the correspondence between the identification result and the drawing signal is deviated, some drawing is performed and it can be handled as a “black” dot.

  As described above, when image data is converted into drawing data, specific values corresponding to “white” and “black” are determined by analyzing the conversion table and the conversion algorithm (in this embodiment, 8). A value selected from a range of 88 to 255 among 8-bit data corresponding to 16-bit data whose lsb is “1” in the state 1 of the main table in the -16 modulation table It becomes possible to draw an image on an optical disk using the encoder 23 of the drawing apparatus 2.

  As mentioned above, although embodiment of this invention was described, this invention can be implemented in various aspects as follows.

<Modification 1>
In the embodiment, it is assumed that an encoder used for DVD-R is used and a conversion table of 8-16 modulation is used. However, an encoder using another conversion table may be used. In this case, as indicated by a broken line in FIG. 11, the host device 3 is provided with a reading unit (reading means) 38 for reading the conversion table and the conversion algorithm from the optical disk drawing device 2, and the read conversion table and conversion algorithm are stored in the data. The data replacement unit 35 may store the two values before encoding so that the two values are different from each other after the encoding by analyzing the conversion table and the conversion algorithm. In this way, it is possible to deal with various encoders. It should be noted that an operation unit is provided in the data replacement unit 35, and numerical values corresponding to “white” and “black” are designated by the user's operation. May be generated.

<Modification 2>
In the embodiment, one pixel represents 33 gradations by arranging 33 dots in the sector direction. However, the length of one pixel is set by arranging 3 dots in the sector direction and 11 dots in the track direction. May be 30.3 μm and the width may be 8.14 μm, or all may be expressed in gradation in the track direction so that the length of one pixel is 10.1 μm and the width is 24.42 μm. The gradations may be expressed in any arrangement, but natural gradation expression is possible when the length and thickness of one pixel are the same, that is, in a situation close to a square. Further, as described above, the length of one dot in the sector direction changes on the inner and outer peripheral sides of the optical disc 100, but the track pitch does not change. Therefore, in order to keep the shape of one pixel close to a square, the ratio of the number of dots in the sector direction and the track direction may be appropriately changed between the inner peripheral side and the outer peripheral side of the optical disc 100.

<Modification 3>
In the embodiment, the host device 3 converts image data into drawing data as the optical disk drawing data generation device. However, the system control unit 19 of the optical disk drawing device 2 has a function of converting image data into drawing data. May be. In this case, the host device may transmit the image data as it is to the optical disk drawing device 2. Then, the system control unit 19 may convert the image data into drawing data and output it to the buffer memory 24. The host device 3 and the system control unit 19 of the optical disc drawing apparatus 2 may share the function of converting image data into drawing data. For example, the host device 3 may perform gradation data conversion, and the system control unit 19 may perform processing after data replacement. That is, the entire optical disc drawing system only needs to have the function of an optical disc drawing data generation device.

<Modification 4>
In the embodiment, the portion of the optical disc 100 that changes the color of the drawing layer 102 is “black” and the portion that does not change color is “white”. However, the correspondence may be reversed depending on the nature of the drawing layer 102. For example, when the reflectance is lowered by changing the color of the drawing layer 102, the portion to be changed may be “black” as in the present embodiment, and when the reflectance is increased by changing the color, the color is changed. The portion may be “white”. In this case, in the host device 3, the setting may be performed by the user operating the host device 3, or may be set based on information such as an ID stored in the optical disc 100. In this way, even if there is a difference in the properties of the drawing layer 102 depending on the type of the optical disc 100, an image can be drawn with high quality.

<Modification 5>
In the embodiment, the numerical values corresponding to “white” and “black” in the data replacement unit 35 are 88 out of 8-bit data corresponding to 16-bit data whose lsb is “1” in the state 1 of the main table. Two data were selected and determined from the data of ~ 255. In this case, various numerical values can be selected. However, conditions may be further narrowed down so that the DSV absolute value becomes a predetermined value (for example, 2) or less. In this way, the ratio of “H” and “L” in the generated drawing signal can be made closer to 50%, the reflectance corresponding to one dot can be stabilized, and the image can be displayed with high quality. Can be drawn.

<Modification 6>
In the embodiment, the image is drawn on the label surface LS side of the optical disc, but the image may be drawn on the data recording surface DS side. In this case, the data recording layer 106 may be irradiated with the laser beam 13.

<Modification 7>
In the embodiment, the host device 3 has a portion corresponding to the optical disc drawing data generation device that converts the image data of the image to be drawn on the optical disc 100 to the drawing data. However, the host device 3 corresponds to the optical disc drawing data generation device. It is also possible to cause a computer to execute a program for providing a function to perform conversion from image data to drawing data. This program may be recorded and distributed on a recording medium such as a CD or DVD, or may be distributed through an electric communication line.

It is sectional drawing of an optical disk. It is a block diagram which shows the structure of an optical disk drawing apparatus. It is a block diagram which shows the structure of the encoder of an optical disk drawing apparatus. It is explanatory drawing of a data frame. It is explanatory drawing of an ECC block. It is explanatory drawing of a recording frame. It is explanatory drawing of a physical sector. It is explanatory drawing of NZRI conversion. It is a block diagram which shows the structure of a write signal preparation device. It is explanatory drawing of the conversion of the signal in a write signal preparation device. It is a block diagram which shows the structure of a host apparatus. It is explanatory drawing about the conversion of the signal in a gate circuit, and the drawing to an optical disk.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Optical disk drawing system, 2 ... Optical disk drawing apparatus, 3 ... Host apparatus, 31 ... Image data input part, 32 ... Monotone conversion part, 33 ... Polar coordinate conversion part, 34 ... Gradation data conversion part, 35 ... Data replacement part, 36 ... Descramble conversion unit, 37 ... Interface, 38 ... Reading unit, 10 ... Interface, 11 ... Spindle motor, 12 ... Spindle servo, 13 ... Laser light, 14 ... Optical pickup, 15 ... Stepping motor, 16 ... Feed mechanism, DESCRIPTION OF SYMBOLS 17 ... Motor driver, 18 ... Focus servo, 19 ... System control part, 20 ... Tracking servo, 21 ... ALPC circuit, 22 ... Laser driver, 23 ... Encoder, 231 ... Data frame formation part, 232 ... Scramble part, 233 ... ECC Block forming unit, 234 ... recording frame forming 235 ... Physical sector forming unit, 24 ... Buffer memory, 25 ... Decoder, 26 ... Write signal generator, 261 ... Strategy circuit, 262 ... Discriminator, 263 ... Time axis extender, 264 ... Gate circuit, 2641 ... AND Circuit, 100 ... Optical disc, 101, 107 ... Polycarbonate, 102 ... Drawing layer, 103, 105 ... Reflective layer, 104 ... Adhesive layer, 106 ... Data recording layer, 108 ... Groove

Claims (3)

It has an encoder that is used for data recording and generates an encoded signal based on the conversion table and conversion algorithm for the input data, and records the data on the optical disk based on the signal, and the input drawing data An optical disc drawing data generating device that generates a drawing signal based on the drawing signal, identifies black and white of the image from the drawing signal, and supplies the drawing data to an optical disc drawing device that draws the image on an optical disc based on the drawing signal There,
Storage means for storing the conversion table and the conversion algorithm;
Determining means for determining binary values corresponding to each of black and white of the image;
Replacement means for generating the drawing data by replacing each of the black and white data of the image with the binary value determined by the determination means;
A signal pattern generating unit that generates a signal pattern corresponding to each of the binary values based on a conversion table and a conversion algorithm stored in the storage unit, and outputs the signal pattern to the optical disc drawing device;
When the drawing data generated by the replacement unit is encoded by the encoder and a drawing signal is generated, the determining unit is configured so that the optical disk drawing device extracts a portion corresponding to the black and white from the encoded drawing signal. An optical disk drawing data generation apparatus characterized in that binary values are determined based on a conversion table and a conversion algorithm stored in the storage means so as to be identified by a signal pattern. It has an encoder that is used for data recording and generates a signal obtained by encoding input data based on a conversion table and a conversion algorithm. The encoder records data on an optical disk based on the signal, and causes the encoder to draw data. an optical disk drawing system for drawing an image on the optical disk based on the drawing signal generated by is inputted,
Storage means for storing said conversion algorithm before Symbol conversion table,
Determining means for determining binary values corresponding to each of black and white of the image;
Replacement means for generating the drawing data by replacing each of the black and white data of the image with the binary value determined by the determination means;
Signal pattern generation means for generating a signal pattern corresponding to each of the binary values based on a conversion table and a conversion algorithm stored in the storage means;
Identifying means for identifying, by the signal pattern, a portion corresponding to the black and white from the drawing signal generated by the encoder;
The determination means is based on a conversion table and a conversion algorithm stored in the storage means so that the identification means can identify a portion corresponding to the black and white from the drawing signal generated by the encoder by the signal pattern. An optical disc drawing system characterized by determining binary values. It has an encoder that is used for data recording and generates an encoded signal based on the conversion table and conversion algorithm for the input data, and records the data on the optical disk based on the signal, and the input drawing data A computer that generates a drawing signal based on the drawing signal, identifies black and white of an image from the drawing signal, and supplies the drawing data to an optical disc drawing apparatus that draws the image on an optical disc based on the drawing signal; Storage means for storing the conversion algorithm;
Determining means for determining binary values corresponding to each of black and white of the image;
Replacement means for generating the drawing data by replacing each of the black and white data of the image with the binary value determined by the determination means;
Generating a signal pattern corresponding to each of the binary values based on a conversion table and a conversion algorithm stored in the storage unit, and causing the optical disc drawing device to function as a signal pattern generation unit that outputs the signal pattern;
When the drawing data generated by the replacement unit is encoded by the encoder and a drawing signal is generated, the optical disc drawing device includes a determining unit that determines a portion corresponding to the black and white from the encoded drawing signal. A computer-readable program characterized by causing a binary value to be determined based on a conversion table and a conversion algorithm stored in the storage means so as to be identified by the signal pattern.

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