TW200306541A - Write-in method for high-density optical recording apparatus and its circuit - Google Patents

Abstract

A kind of self-adaptive write-in method and circuit for high-density optical recording apparatus are provided in the present invention. The circuit includes the followings: a discriminator, which is used to discriminate the marked region size at that time of the input data and the size of leading and/or lagging blank region; a generator, which is used to control the waveform of a write-in pulse according to the marked region size at that time and the size of leading and/or lagging blank region so as to generate an appropriate write-in pulse; and a driver, which converts the appropriate write-in pulse into a circuit signal for driving light source based on the driving energy level of each wavelength section. According to the marked region size and the size of leading and/or lagging blank region when inputting the NRZI data, the pulse widths of the first and/or the last pulses for a write-in pulse waveform are variable such that surge-wave is decreased to the minimum so as to enhance system reliability as well as efficiency.

Description

200306541 V. Description of the invention (1) Background of the invention [Technical field to which the invention belongs] The present invention relates to a writing method and a circuit suitable for use in a high-density optical recording device. The ideal writing method for light energy, for example, a laser diode, can be applied to the characteristics and circuits of a recording device. [Previous Technology] Since high-capacity recording media are required in the multimedia era, optical recording systems use high-capacity recording media, such as magnetic disc devices (MOD) or digital versatile disk devices (DVD — RAM) using random access memory. ), Have been widely used. As the recording density increases, the optical recording system is required to be ideal and high precision. In general, with the increase in recording density, temporary fluctuations in the data domain (attributable to the “surges” mentioned below) also increase. Therefore, in order to achieve high-density recording, it is important to minimize the surge. As usual, the formation of a write-once pulse is detailed in the DVD-RAM format manual shown in Figure 1 (b), regarding the input NRZI (NO N — Return to Zero Inversion): There are 3 T, 5 T and: I 1 T (T stands for the band timing period), which are shown in Figure 1 (a). Here, NRZ I data is divided into marked areas and blank areas. The blank area indicates that it is in the erasing energy level of the copy. The waveform of one write pulse in all marked areas is equal to or greater than the marked area of 3T, that is, 3T, 4T, ... 1 1 T and 1 4 T are included in a first pulse and a final

9104093.ptd Page 8 200306541 V. Description of the invention (2) Pulse and a multi-pulse sequence. Here, only the number of pulses in the multi-pulse sequence is variable according to the size of the marked area. In other words, the waveform of the write pulse is contained in a read energy (Figure 1 (C), that is, a spike energy or write energy (Figure 1 (d)) and a bias energy or erase energy (Figure 1 (e) ). Here, the relevant energy signals are shown in Figures 1 C, 1 D and 1 E as low-potential action signals.

The waveform of the write pulse is the same as that produced by the first-generation 2.6 G B D V D — R A M. In other words, according to the specifications of the first generation 2 · 6 GB DVD-RAM, the waveform of the write pulse is contained in a first pulse, a multi-pulse sequence, and a last pulse. Although the rising edge of the first pulse or the falling edge of the last pulse can be read from a leading area, a suitable write is not possible because the write pulse is fixed. Therefore, when a write operation is performed by forming a write pulse representation as shown in FIG. 1B, severe thermal interference may cause the phase to be backward or forward relative to the target area according to the input N R Z I data. In other words, when a marked area is long and a blank area is short or badly inclined, the surge is more serious. This is a major reason for reducing system efficiency. Similarly, this also makes it impossible to apply this system to high-density DVD-RAM s, for example, such as the second-generation 4.7 GB DVD-RAM s. [Abstract] To solve the above problem, this is It is an object of the present invention to provide a

9104093.ptd Page 9 200306541 V. Description of the invention (3) A suitable writing method, in which a writing pulse is generated based on the size of the marked area and the size of leading and / or trailing blank areas when inputting data. . Another object of the present invention is to make the light energy of the laser diode ideal by generating a suitable write pulse according to the size of the marked area and the size of the leading and / or trailing blank space when inputting data. To provide a suitable writing circuit for high-density optical recording devices. So, in order to achieve the first purpose, here is a method to write the input data in an optical recording medium by the waveform contained in a first pulse, a last pulse and a write pulse in a multi-pulse sequence. In the above, this suitable method includes the steps of controlling the waveform of the write pulse, generating a suitable write pulse according to the size of the marked area and the size of the leading and / or trailing blank space when the data is input, and the appropriate writing The input pulse writes the input data on the optical recording medium. In order to achieve the second purpose, here is provided a device, with a write pulse, its waveform is contained in a first pulse, a last pulse and a multi-pulse sequence to write input data in an optical On the recording medium, this suitable writing circuit includes a discriminator to discriminate the size of the time zone of the input lean material and the size of the leading and / or blank space. A waveform generator controls the writing pulse. Waveform, the write pulse f is based on the input data, the size of the marked area and the size of the leading and / or trailing blank space to generate a suitable write pulse, and a driver by converting the appropriate write pulse to A circuit signal that drives the light source according to the driving energy levels of the respective bands.

9104093.ptd Page 10 200306541 V. Description of the Invention (4) [Embodiment] Hereinafter, a preferred embodiment of a suitable writing method and circuit for a high-density optical recording device will be described and reference is made to the accompanying drawings. . A suitable writing circuit according to the present invention, shown in FIG. 2, includes a data discriminator 1 0 2, a writing waveform controller 1 0 4, a microcomputer 1 0 6, and a writing pulse generator 1 0 8 And a circuit driver 1 1 0. In other words, the data discriminator 10 2 discriminates the input N R Z I data. The write waveform controller 104 corrects the waveform of the write pulse based on the discrimination results generated by the data discriminator 102 and the ground / fixed signal. The microcomputer 1 0 6 initializes the writing waveform controller 104, or ¥ controls the data stored in the writing waveform controller 104 to be updated according to the writing status. The write pulse generator 108 generates a suitable write pulse based on the output of the write waveform controller 104. The circuit driver 1 10 converts a suitable write pulse generated by the write pulse generator 108 to become a circuit signal according to the energy level of light of each band to drive the light source.

9104093.ptd Page 11 200306541 V. Description of the invention (5) Enter the waveform controller 104. Here, the size of the leading and trailing blank areas and the size of the marking area at that time may range from 3 τ to 4 τ. May exceed 1 ◦ 0 0 combinations. Therefore, in order to get the total of the rising edge of the first pulse and the falling edge of the last pulse in all conditions, circuits and memory are necessary, making the system and hardware more complicated. Therefore, in the present invention, the size of the marked area and leading and trailing blank areas at the time of inputting NRZ I data is divided into short pulse groups, medium pulse groups, and long pulse groups. At t, the marking area and leading and trailing blank spaces are different. The size of the division is used as the basis for the distinction. The write waveform control 104 changes the rising edge of the first pulse, so that the backward and forward directions are determined based on the size of the leading blank area provided by the discriminator 〇2 and the size of the * time stamp non-area, or the last change The falling edge of the pulse is such that backward and forward are based on the size of the marked area and the trailing blank area at this time, so as to form a writing waveform with the optimal light energy. Here, a multi-pulse sequence of a marked area uses the same form as that shown in Fig. 3B, that is, 0.5 D.

. The same 'write waveform controller 104 can correct the rising edge of the first pulse of the marked area at the time, and the falling edge of the last pulse of the marked area at the time becomes a different value' on the ground line or fixed potential line According to the external supply ground / fixed signal (LAND / z groove), indicate the input, NRZ data. This is to form a write waveform, taking into account the optimal light energy depending on the ground or fixed potential. The most ideal light energy, there is a gap of i ~ 2 mw between ground and fixed potential, which can be specially set or used by setting and writing. So write the waveform controller

9104.93.ptd Page 12 200306541 V. Description of the invention (6) 104 can be used. The size of the data in the volume is stored in the target area. The value of a pulse is up to the memory (T). Sub-pulse falling edge of the same display area is prepared once and ground. The light is controlled according to the write pulse of the zero and the suitable current is controlled. A memory, phase, and leading edge are used. In this case, the composition of the first pulse plus or minus a data value in the memory of the first and last pulse edges in the rising and rising changes can be selected by its computer 1 / or can be repositioned to control the impact generation The write pulse is written by controlling the write pulse for the write pulse and the table of the drive value is shown in the table below. The write pulse of the pulser 1 0 8 indicates that the waveform control signal indicates that each of the pulses is inserted into the current generator 1 1 0 body or a logic circuit to be grouped according to the input NR at that time and the size of the blank space behind, the fluctuation value, and finally The pulse is written to the waveform controller. The width of the pulse and the last pulse is determined by (variable value) and stored. 'For each ground and solid fluctuation value, a table of dynamic values can also be stored, and storage can be combined most. The two are separated in Figure 6 and Figure 7. The written value of the waveform controller 1 is changed according to the recording state or the first and last pulses. The first falling edge in the memory of the ZI data is determined by a time-stamped potential in the memory. . The next table storing the first post-pulse can be updated by 4 or the control section. The special pulse width data of the waveform can be provided to. The write pulse generator 1 08 generates a waveform of the write pulse provided in FIG. 3F according to the pulse width data generator 104, and in FIGS. 3C'3D and 3E to control this band (that is, Read, spike and bias band) Drive 1 1 0. Conversion of individual bands (ie read, spikes and skew

9104093.ptd Page 13 200306541 V. Description of the invention (7) The driving energy level of the light energy becomes a current, and the control time and current of each band are controlled to allow this current to flow through the laser diode. The control signal is the same, so the appropriate amount of heat is applied to the recording medium, by continuous switching action or change in the total amount of light. Here, the definition domain of a record is shown in Fig. 3 (g), which is formed by the media in the record. Fig. 3 (a) indicates that NRZ I lean material is not input. It is divided into a marked area and a blank area. Fig. 3 (b) shows a basic writing waveform, in which the rising edge of the first pulse of the writing pulse falls 0.5 times behind the rising edge of the marked area at that time. Figure 3 (c) shows a waveform of a read energy suitable for a write pulse, Figure 3 (d) shows a waveform of a peak energy suitable for a write pulse, and Figure 3 (e) shows a suitable pulse for a write pulse A waveform of bias energy. Fig. 3 (f) shows a waveform of a suitable write pulse proposed by the present invention. The rising edge of the first pulse of the write waveform of a suitable write pulse may be shifted backward or forward depending on the combination of the size of the leading blank area and the size of the time stamp area. Any energy (here, a read or write energy) is applied during a period equivalent to this offset. Similarly, the falling edge of the last pulse of the write waveform of a suitable write pulse may be shifted backwards or forwards depending on the combination of the size of the time stamp area and the size of the blank space. Similarly, any energy (here, a read or write energy) is applied during a period equivalent to this offset. Alternatively, the falling edge of the last pulse may shift forward or backward according to the size of the marked area at the time, regardless of the size of the backward blank area of the marked area at the time. Similarly, it is more appropriate to offset the first pulse

9104093.ptd Page 14 200306541 V. Description of the invention (8) The rising edge and the falling edge of the last pulse may be shifted. Similarly, observing the direction of the shift, the shift may be performed forward or backward, and only forward or backward. Figure 4 depicts the groups of input NR Z I data, showing two groups of examples. In the first example, if a low group indicator is 3 and a high group indicator is 1 2, the labeling area of the short pulse group is 3 T, and the labeling area of the medium pulse group is from 4 T to 1 1 T, the labeled area of the long pulse group is 1 4 D. In the second example, if a low group indicator is 4 and a high group indicator is 11, the short pulse group has 3 T and 4 T labels, and the middle pulse group has 5 T to 1 labels. 0 T, the marked areas of the long pulse group are 1 1 T and 1 4 T. As described above, since both the low group indicator and the high group indicator are used, the practical efficiency is enhanced. Similarly, groups can be implemented differently depending on the individual zero positions. Figure 5 depicts various situations determined by the combination of leading and trailing blank areas and the marking area at that time. Figure 4 shows the conditions under which input NR Z I data is classified into three groups using group indicators. Fig. 6 depicts a table showing the fluctuation value of the rising edge of the first pulse determined by the size of the leading blank area and the size of the marked area at that time. Fig. 7 depicts a table showing the fluctuation value of the falling edge of the last pulse determined by the size of the time stamp area and the size of the blank space after the mark. f Fig. 8 is a flowchart describing an embodiment of a suitable writing method of the present invention. First, a writing mode is set (step S1 0 1). If the writing mode has been set, it is determined whether it is a suitable writing method (step S102). If it has been determined in step S1 02 that the write mode is one

9104093.ptd Page 15 200306541 V. Description of the invention (9) For a suitable writing mode, a group index is set (step s 丨 〇 3). Then, a group table determined by the set group indicator is selected (step S104). The selected group table is a table that can reflect the ground / fixed potential as the group indicator. . The selected form is also a form that reflects the zero position of the media in the record. The fluctuation value of the rising edge of the first pulse is based on the combination of the leading blank area and the marked area at that time. It is read from the table shown in Figure 6 (step S1 05). The fluctuation value of the falling edge of the last pulse is The combination of the display area and the backward blank area at that time is read from the table shown in FIG. 7 (step S106). Appropriate write pulses are generated (step s7), and the first and last pulses in 1 are controlled based on the read fluctuations. Missing 1 Do not have a suitable write pulse to read in order; Laser diode (step is not a suitable writing mode / fixing; " movement_. Such as I this writing mode At step 3107, a normal write pulse will be produced by the usual two write side by a suitable writing method according to the present invention and the light energy is 9.5 mw, a surge of the evening. It has been understood, assuming peak

The cooling energy is i • The bottom energy of the evening pulse sequence is 1.2 m W. According to the present invention, the merchant m W and the bias energy are 5. 2 m W. When the general writing side is equal to the 耷 writing pulse , When the surge is less than the basis. Initialized drop: The surge generated when a fixed write pulse is entered is a barrier condition: a speed of 4 · 2 meters per second, erasing energy 7

9104093.ptd

Η Page 16 200306541 V. Description of the Invention (ίο) • 2mW and 100 write operations. In other words, according to the present invention, when the marking area of the write pulse is appropriately changed, the rising edge of the first pulse will be appropriately shifted. Control the waveform of the write pulse, and / or the falling edge of the last pulse will be appropriately shifted 'based on the size of the time zone of the input NRZI data' and the size of the blank space after the control to control the waveform of the write pulse. The wave reduction is minimized. Similarly, the waveform of the write pulse based on the ground / fixed signal can be perfected. Similarly, in the present invention, grouping may be performed differently according to the respective zero bits, using the group index. A new suitable writing method according to the present invention can be adopted in most high-density optical recording devices using suitable writing pulses. As stated above, the width of the first and / or last pulse of a write pulse is variable. According to the size of the current marked area of the input NRZI data and the size of the leading or trailing blank area, the surge is minimized. To enhance the reliability and efficiency of the system. Similarly, the width of a write pulse is controlled by reducing the size of the hardware by combining the size of the current marked area and the size of the leading or trailing blank area.

9104093.ptd Page 17 200306541 Brief description of the drawings [Simplified description of the drawings] The above objects and advantages of the present invention will become more apparent by describing a preferred embodiment in detail and referring to the obvious drawings: Figures 1A to 1E It is a waveform diagram of an ordinary write pulse. Fig. 2 is a block diagram of a suitable writing circuit for a high-density optical recording apparatus according to an embodiment of the present invention. 3A to 3G are waveform diagrams of a suitable write pulse which is recorded by a suitable write circuit shown in FIG. Figure 4 is an illustration of a combination of input data. FIG. 5 illustrates the pulse combinations generated by the data combination shown in FIG. Figure 6 illustrates the rising edge variation of the first pulse according to the present invention. Figure 7 illustrates the falling edge variation of the last pulse according to the present invention

9104093.ptd page 18 200306541 Simple diagram description 1 1 0 Circuit driver is 9104093 ptd page 19

Claims (1)

6,200,306,541, patent application scope 1 · A write pulse for high-density recording media, in accordance with the NRZI signal value change, a method corresponding to the pulse width occurs 'is based on the energy of the marked area at that time,' The energy value of the rising edge indicates the offset from the falling edge of the trailing blank area. 2. The pulse waveform described in item 1 of the scope of the patent application is composed of the first pulse, and the rising edge of the write pulse secondary pulse, and said, refers to the falling edge of the last pulse 3 The first scope of the patent is that the combination of the offset of the rising edge and the energy value of the marked area at that time, and the offset of the falling edge are based on the combination of the energy values of the current area. 'The shift of the rising edge, = leading the energy value of the blank area, the offset value of the falling edge is summed, and the Lode: empty & parish energy value is shifted. The control method of the K write pulse waveform, the energy waveform of the marked area and the blank area of the number is characterized in that the square value and the leading blank area energy value are offset to the edge, and according to the temple ’s energy value at that time, The writing pulse wave control method, in which the rising edge of the writing, multi-pulse sequence, and last pulse, refers to the falling edge of the first writing pulse waveform, and the control is backward or The control of the forward shift of the time mark area is based on when the comparison is performed, and is based on the line comparison post-production method, which features the energy value of the previous blank area and the forward shift, and the energy value and the backward blank. Method 'The characteristic value of the energy in the marked area at that time is then corresponding to the energy of the marked area at that time, and then the corresponding 5. The control method described in item 1 * 2 of the patent application scope is characterized by 200306541 6. The offset of the rising edge or falling edge of the write pulse waveform described in the scope of the patent application is that according to the grouping table, the labeling area and blank energy and value of the NRZI signal can be read from the grouping table For the marked area of the NRZ signal and the energy value of the white area, the table is divided into different pulse sizes, and the rising edge offset value and the edge offset value of the write pulse waveform generated by the two NRZI signals. / Bu Jiang 6. The control method according to item 5 of the scope of the patent application, wherein the grouping table is based on the energy value of the bar area at the time of inputting data on the recording medium, and the energy of the leading blank area. Value, divided into short ^ burst group, medium pulse group and long pulse group, and stores the pulse width data corresponding to the first or last pulse written into the pulse waveform. 7. The control method according to item 5 of the scope of patent application, characterized in that: the offset value of the rising edge of the first pulse is read according to the combination of the leading blank area energy value and the time mark area energy value, and Calculate the pulse width data of the first pulse; and according to the combination of the energy value of the marked area and the energy value of the lagging blank area at the time, read the offset value of the falling edge of the final pulse, and calculate the pulse width data of the last pulse. 9104093.ptd Page 21