TW200818148A - High-speed optical recording - Google Patents

Abstract

An optical recorder comprises a laser driver for generating a laser drive signal in which level changes are aligned on a time grid with a given pitch (Tdr). The laser driver provides the laser drive signal with a pattern that comprises an intermediate level (Pi50%). The intermediate level (Pi50%) is chronologically arranged between a quiescent level (Pb) for leaving a space on an optical disk track and a write level (Pw) for writing a mark on the optical disk track. The intermediate level (Pi50%) is comprised between the quiescent level (Pb) and the write level (Pw).

Description

200818148 IX. DESCRIPTION OF THE INVENTION: TECHNICAL FIELD OF THE INVENTION One aspect of the invention relates to a laser driver for optically recording a crap drive signal. For example, /, contains a laser for the production of Raymond (Blu-ray Disc Blu-ray Disc Association: According to the so-called Blu-ray Disc for high-speed recording. The present invention / π) 'optical recorder can form a laser Driver, optical recording method 1 "Integrated circuit number of the creation of M, + m & for the laser drive _ Ο 之 t-like method, used to define laser products, and The signal used to drive the type of light-powered tiger [prior art] The signal of the laser of the dry money (4). The optical recorder usually casts the laser beam by ^ ^ ^, without the carrier on the optical recording state. And digital universal disk (DVD): The recording carrier is an example of a disk format. The laser beam produces a spot on the 丄4) body that moves along a given track. The laser beam has the power of the data signal change. When the power. σ knives 千田功羊 is at the writing level, the laser forms a mark on the magnetic slab. When the power is at a standstill, the laser beam leaves the work space. The spatial reflectivity is comparable. The mark is large, #和哉移—and vice versa, depending on the characteristics of the precursor carrier Generally represents data marker signals - J i string hanging string represents zero mark or shellfish feed signals respectively representative of a space or the number of zero length in the relevant string...

Optical recorders typically include a laser driver that produces a rate-dependent laser drive signal of the modulated laser beam. Preferably, the laser driver should ensure that the human mark and space can be accurately written on the optical carrier to represent the data signal to be recorded. Each number of one or zero, respectively, represented by a mark or space has a nominal length of I 121922.doc 200818148. For example, if the length of the written mark exceeds the length of the rod to a large extent, it can happen that Jing " Learn to read...'. The mark may be too long. In this case, one or more excessive ones may be generated when the light D β is marked. Phase 5, if the mark is too short, f + j ‘After taking the error. Optical readers can produce as many as one. The power modulation of the laser king ^ 丨 bundle determines the length of the standard year to a large extent. Therefore, 庐々1 ύ π and precise writing between the stations avoid reading errors and include precise laser beam power modulation.匕 Ο Ο ▲ 2 (4) S provides accurate laser beam power based on the driver clock signal. ^ Provides a definition of the different lengths that the mark can have. The drive is a given period of time, which is hereinafter referred to as the (four) clock cycle. The driver clock signal defines a time frame thumb that has a distance corresponding to the circumference of the driver. The pattern definition of the markers belonging to a given spacing defines the specific laser beam power modulation aligned on the time grid. That is, the type definition

A variety of laser beam power reincarnation. Long φ 0_L 4- I ^ Each laser beam power transition occurs at a specific grid point within the time grid defined by the driver clock signal. A laser-pulsing circuit is disclosed in U.S. Patent No. 6,674,702, which includes a drive waveform generating unit that generates a drive waveform signal based on an input signal. The drive waveform generating unit includes a drive waveform storage unit that stores a recording strategy in accordance with the disk type. The laser driving circuit further includes a first current supply unit that supplies a first driving current 向 to the first laser diode and a second current supply unit that supplies a second driving current to the second laser diode . The switching unit selectively supplies the driving waveform signal to the first current supply unit or the second current supply unit. SUMMARY OF THE INVENTION One of the objects of the present invention is to provide optical recording at a moderate cost. - The Shenyue patent target enclosure defines various aspects of the invention. The application of the scope of the independent term macro, the T patent, is intended to advantageously implement the additional features of the present invention. Consider the following points in the month. High-speed, high-density optical recording, when the driver is in the phase, this j J is the parent's direction. For example, assume that a low-density material is allowed to play according to the high-density light. It is also assumed that the data is recorded optically using the standard Ο , 、, Γ 0 的 己 recorded speed. In this case, the data signal to be recorded by the fish will have a capacity of 660 million bits per second: The bit 7G period corresponds to 1S15 nanoseconds (ns). η foot _ true laser beam power modulation can take a few times more than the bit period of interest: clock cycle. The driver clock cycle can even be an order of magnitude longer than the bit period. In the foregoing example, the 'driver clock period may thus be less than a few (10) picoseconds (ps), or less than (10) ps. This h laser driver needs to operate at several gigahertz driver clock frequencies, such as H) GHz. More design efforts and special processes are needed to implement an actual laser driver implementation operating at this-South drive clock frequency. In accordance with one aspect of the invention, a laser drive signal having an alignment level change on a thumb having a given pitch has a pattern including an intermediate level. The intermediate level is chronologically placed between the static level used to leave the gate on the optical track and the write bit = used to write the human-mark on the optical disk. The intermediate level is included between the static level and the write level. The introduction of an intermediate level within the pattern for the laser drive signal can temporally shift the effective laser beam power transition, which determines the spatial and spatial transitions on the optical carrier. That is, the intermediate level used in the pattern of the laser driving signal can be converted into a given time offset of the effective lightning body ten φ Λ, 玄, # beam force rate transition. At a given time, the intermediate level is changed to a functional relationship. Therefore, an effective laser beam power transition can occur at a particular instant by giving the middle 'Longtian value'. The intermediate level thus allows for a finer time resolution than the time grid applied by the driver clock signal. Therefore, the driver's clock frequency is lower than that of the conventional solution. For these reasons, the laser beam power adjustment of ...== is used for high-density core=cost-providing optical recordings. In this respect, it should be noted that the invention allows for a few picosecond levels ~ a few halves of the slaughter] resolution, which can not be achieved in the traditional solution industry, even if it can be achieved. Embodiments of the invention advantageously include one or more of the following additional (four), /, as described in separate paragraphs corresponding to individual sub-items. Preferably, the pattern of the stop = τ number includes a pre-pulse level arranged in time between successive intermediate levels. The pre-pulse level is lower than the spot 5 to receive the laser drive signal. The associated critical level of the laser contributes to the intermediate level and the effective laser beam power transition gate. The precise relationship between the knife and the turn of the knives according to the present invention provides the laser drive letter containing the memory, the address generator, and the type of production = good system of the package signal storage individual definition Μ立 = limb for the laser drive By definition - the individual patterns can be individually read from the memory according to the input data signal from the body t: the body is taken. The pattern generator J i-like generates a laser drive letter 121922.doc 200818148: This additional feature provides flexibility due to the ability to program the laser driver to provide different types of suitable prints. Preferably, the pattern generator includes individual values of individual registers that the individual registers can have for the laser drive signal. Can =! Ο

Two: Individually specify individual registers. The digital-to-analog converter responds from the memory: , 'the individual type definitions captured' to provide laser-driven signals based on individual temporary storage ^ ::. These additional features contribute to the individual level of the two. The reference within the meaning is sufficient to define the type, and the best system 'stores the individual values corresponding to the individual intermediate levels in the individual registers. These additional features facilitate high speed recording because the recording of various intermediate levels allows for finer time resolution. Preferably, the pattern generator includes a timing circuit that can be programmed by a pattern definition. The timing circuit provides a series of timing pulses that define individual time intervals during the conversion of individual values. These additional features contribute to low cost and high speed' because the shorter definitions within the definition of the pattern are sufficient to define individual time intervals within the pattern. The embodiments of the above summary and additional features are described in the context of the drawings. [Embodiment] Fig. 1 illustrates a process of reading from a rewritable optical disk on which data has been recorded. Fig. 1 has a higher section' which is a photograph of a portion of a magnetic susceptor TR on a rewritable optical disk. The photo shows that the optical disk track (3) contains an amorphous region and a crystalline region. The amorphous regions have a more uniform, light gray shade. Amorphous area 121922.doc 200818148 Constituent mark. Crystallization p· A 1 Rong, phase change material formation domain constitutes space. These areas are represented by a specific type: two have a lower section, which explains the magnetic interpretation from the disc. The lower part contains a private and a vertical axis representing the reflectance k. Water; horizontal sleeve reading disc track _ two! fetch. Vertical: The grid line represents the correct speed 相应 相应 Correspondingly, the disc reading order takes the specific point of the disc track TRJl between the special series, and the white corresponds to a specific point on the horizontal axis. The graph contains a curve whose instantaneous reading is on the light point...: The heart is not in the reflectivity of the given Qiu... The curve represents the change in reflectivity of the knife along the disc magnetic hold TR, which is illustrated in the upper section of the drawing. The curve is also I: is the converter output signal of the photoelectric interface in the optical disc reader. The Qin Baohe corresponds to a negative pulse of the amorphous region on the optical disk TR. That is, the 'negative pulse represents the mark. The negative pulse has a falling edge that oscillates with the reflectance threshold and a rising edge that intersects at another particular (four) reflectance threshold Rth. The individual points have a given distance relative to each other, which represents the length of the associated mark. The skirt produces a series of so-called channel bits from the curve, which are represented below the graph. The series of channel bits CHB constitute channel encoded data read from a rewritable optical disc. Each channel clock cycle has one channel bit. In each channel clock cycle, a decision is made based on the reflectivity in the channel clock cycle and the inverse 6TM threshold Rth. This decision determines whether the channel used for this clock cycle is one (1) or zero (〇). The mark on the disc magnetic stem tr produces a word. 121922.doc 200818148 Therefore, the series of channel bits CHB are alternately strings. The space produces a zero string. The ground contains a string and a zero string. The length can be expressed as η·Τ, so that the η corresponds to the mark representing one of the numbers from the filament ' and the Τ corresponds to the channel clock period Teh. The length of the space can be expressed in a similar manner. In Fig. 1, the part of the optical disk TR of the description of the disk is shown as 1 T 匕 3 6T"", 2T mark, 3 space, 3T mark, 4T space, and 4T mark. Ο It can be understood that if the mark may be mistaken for one, the channel coded data has an inaccurate length and vice versa. However, a bit error occurs within the bit, and a bit error can occur. Zero Even if you read from a rewritable disc, the data recorded on the disc can be correctly reproduced. This is because the channel-encoded data is an incorrectly corrected coded version of the material that has been recorded. The error correction algorithm is applied to the channel code > material, which allows for correction of a given number of bit errors. However, if the number of bit errors in the channel-encoded data exceeds the critical limit value, the data read by the disc can be lost. The more precise the mark being written to the disc, the lower the number of bit errors, which provides a greater limit relative to the critical limit. Therefore, writing marks and spaces with greater precision allows optical recording of strong data. Figure 2 illustrates a procedure for recording on a rewritable optical disk that produces portions of the optical disk track TR illustrated in Figure 1. Fig. 2 has a photograph of the upper section 'which is the same as the section above the figure, which is part of the optical disk track TR. Figure 2 also reproduces the series of channel bits CHB located below the graph in Figure 1. The series of channel bits CHB are optically recorded by subsequently writing the aforementioned marks and spaces on the optical disk track TR: 6T space, 2T mark, 3 bit space, 3 mark, 4T space, 121922.doc -12-200818148 and 4T mark. ^ has a lower section, which contains a graph, which is the time axis of the cut and represents the vertical axis of the laser beam power. The vertical grid line represents the channel clock period in the disc recorder. Assume that the disc is in. Degree: Turn. The laser beam power (10) strikes a particular point of the disk magnet at a specific moment, which corresponds to a specific point on the horizontal axis. = contains a curve indicating the laser beam power pw at a given point on the given disc for any given instant. The curve thus represents the modulation of the laser beam power pw along the portion of the disc track TR, which is The upper section of Figure 2 is illustrated. The curve can also be considered to represent the laser current that drives the laser, which produces the laser beam power PW. /, the laser beam power PW can have three different levels: the dust level And erasing the level Pe, and writing the level Pw. The laser beam power pw is switched between the three levels according to the series of channel bits CHB to be written on the optical disc. For example, the series of channel bits CHB Contains two consecutive-strings surrounded by zeros, for which 2 marks should be written to the disk track TR. By switching the laser beam power according to the specific pattern, the trade mark can be written. Different lengths have specific laser beam power patterns. The laser beam power pattern for 2T marking in Figure 2 contains two shorter write pulses. Individual laser beam power for 3T and 4T markers The patterns contain three and four shorter write pulses, respectively. Track tr. Each write pulse is followed by a time interval during which the laser beam power pw is at the bias level Pb. This corresponds to a shorter cooling period, which prevents the mark from becoming too large. 0 121922.doc -13 - 200818148 Ο 各 Each of the laser beam power patterns illustrated in Figure 2 contains similar first write pulses and similar last write pulses. The individual first write pulses have the following in common. The first one (1) channel appears. The laser beam power PW is switched from the erase level Pe to the write level before the clock cycle. The laser beam power PW is then switched from the write level Pw to the offset at the beginning of the channel clock period. The position of the Pb ° individual last written pulse is followed by a longer time interval, during which the laser beam is located at the money level Pb. For the 3TA4T mark laser: the power pattern contains - or multiple intermediate writers Pulses: Individual intermediate write pulses each have a rising edge from the bias level to the write level and a corresponding falling edge from the write level Pw to the bias level Pb. When the sample is not applicable, by using the laser beam power, X is used to erase the level pe Human-space. Erasing the level of the phase change material: force? to erase the extent of the previously recorded mark (if any). That is, erase = Pe to leave the space illustrated in Figure 2. In contrast, the dust level Pb forms part of the mark writing program in Fig. 2. Second, the procedure recorded on the write-once type disc is described, for example, the light: "Cu:Si alloy as a recording material. Figure 3 is a graph similar to the graph in Figure 2. The horizontal axis represents pw ^ for time T. The vertical axis represents the laser beam power pw. The vertical grid line represents the representative below the graph? The channel clock of the recording (4) is called cHB. 13 A series of channel bit laser beam power PW recorded on the disc can have + pressure level Pb, and m different levels: cooling level Pc, offset-write bit list p writing level: first - Write level - the first ~ in the position pW3. Laser beam power pw root 121922.doc -14- 200818148 The channel bit CHB on the disc to be written is switched between the five levels. For example, the channel bit CHB contains two one-strings surrounded by zeros, for which 2T marks should be written to a write-once optical disc. The channel bit contains a five-word string surrounded by zeros, for which a 5T mark should be written to a write-once type disc. η Ο Regarding the laser beam power modulation, there are significant differences between the procedures described in Figures 2 and 3. In Fig. 2, regarding the rewritable optical disc, ## is marked with various write pulses. Fig. 2 illustrates a specific example in which the number of write pulses is equal to the mark length in accordance with the channel clock period. In Fig. 3, it relates to a write-once type disc, and each mark has only a single write pulse. The cooling level Pc is used to introduce a shorter cooling period immediately after the write pulse, as shown in FIG. : The cooling level Pc forms part of the mark writing procedure as shown in FIG. 2. The bias level Pb of the cooling level PC is used to leave a space.圃j τ, for 2T standard q...w 〇 3·Lee 2: Intrusion level: 2. Phase, under, the single-write pulse for the 5T mark contains various bits. This early-write human pulse begins with the higher third-person position pw3 and the surname. The single write pulse has a first-write level Pwl in the middle portion. The first-one write level Pwl is slightly lower than the second mode feature and can be a thermal balance write: write::#PW3. The i of the write mark will be recorded to the beginning and end of the private 5: "degree. The recording material is heated to a low degree in the middle of the mark. This can be written to a longer mark with higher precision. The lightning shot beam power pattern illustrated in Figure 2 forms an adjacent eight-type stencil for a particular type of rewritable first-disc write strategy. The laser beam power sample illustrated in Figure 3. Forming a write strategy for a specific type 1 write-once optical disc 121922.doc -15- 200818148 points. The write strategy defines the individual levels of the laser beam power pattern and requires the laser beam power to be A quasi-switching, inward and wandering W & 1 , another level of individual moments. Write and useful;, in the type of recording material. For example, as shown in Figure 2, the writing of various types of write pulses The strategy can be used for write-only...when, in order to ensure that each tag has the appropriate length = the timing is important. Switching too fast or too late may result in two situations. Two =;: \ too long, or maybe Shift, or cause a bit error. & can take the light of the disc Figure 4 of the player shows that the disc recorder is operated, for example, according to the so-called Blu-ray disc. The disc recorder 0DR can store input data on the disc DSK so that another device (which can operate according to the same standard) can More important than the input data on the disc DSK. The disc job can be written only - money or rewritable type. Ο μ disc recorder ODR contains various functional entities: input interface, error correction encoder ERC, channel encoder CHC The laser driver LDR, the photoelectric η plane EOI, which includes the laser LA. The functional entities constitute a recording path. The optical disc recorder 〇DR further comprises a reader 11]. The photoelectric interface EOI and the master take|gRDR constitute a weight The path can reproduce the data stored on the optical disc. The optical disc recorder ODR further includes a disk rotating motor DRM& loading mechanism LDM, which are both motor entities. The optical disc C recorder ODR further includes the function of the system level Entity: clock generator CKG, controller CTRL·, and system memory MEMS. Clock generator CKG provides channel clock signal CCK, which is defined in Figures 2 and 3 121922.doc -16- 2008 The channel clock period Tch of 18148. The controller CTRL can interact with the user interface such as the remote control device RCD.

Ο System Memory MEMS contains general descriptions of various intrusion strategies _, WS2, WS3, . . . and write strategy implementation program pws. The general write strategy specifies that the appropriate laser beam power pattern is specified in the _ group, which is used to write data on a specific type of disk. A particular type of disk: A specific shape characteristic that determines the appropriate laser beam power pattern set for that particular type of disk. For this reason, the writing strategy can vary depending on the disk. The optical disk recorder 〇DR functionally represented in Figure 4 can be implemented in many different ways. The system memory MEMS can include a non-volatile memory module that stores general write strategy descriptions WS1, ws2, and write strategy implementations PWS. Non-volatile memory modules are preferably erasable and programmable to update the general write strategy description and the write-two policy implementation program PWS. The laser driver LDR can be implemented in the form of a programmable dedicated integrated circuit. An example will be given below. μ / thinking, functional entities can be implemented by software or hardware or a combination of software and hardware. For example, a processor can be suitably programmed:: The error correction encoder ERC and the channel encoder chc are implemented. In this software-based implementation, the software module allows the processor to perform the specific operations of the error encoder ERC and channel encoder CHC. The controller CTRL is usually implemented in the form of a #programmed processor. A single-suitable stylized processor can form a combined implementation of various functional entities, such as controller CTRL, error correction encoder ERC, and channel coding piano CHC. Alternatively, each of the foregoing functions may be implemented in the form of - or a plurality of dedicated circuits 121922.doc -17- 200818148 entities. That is, the hardware-based implementation plan. The hybrid implementation may include a soft phantom i and one or more dedicated circuits. Fig. 5 illustrates a number of operations in the form of a series of steps S1 to S5 which are performed by the optical disk recorder ODR when the user inserts the optical disk into the optical disk recorder 〇DR. It is assumed that a disc can record a disc, which can be a write-only or rewritable type. In step S1, the controller CTRL receives an indication to insert a disc. The controller CTRL responds to cause the loading mechanism LDM to properly position the disc (CTRL - LDM: POS[DSK]). Subsequently, the controller CTRL activates the disk rotation motor DRM, which causes the disk to rotate at the appropriate speed (CTRL - DRM: ROT [DSK]). The controller CTRL then activates the laser within the optoelectronic interface EOI, which produces a spot of light for reading purposes on the disc (CTRL_>E〇I: POS[SP]) 〇controller CTRL·controls the optoelectronic interfaceΕ 〇Ι, so that the spot is on a specific track on which the identification data has been stored. Identification data provides general information about the disc, including type information, that is, information about the type of disc. In step S2, the reader RDR receives the converter output signal TO from the photo interface EOI. The converter output signal TO is an analog signal of a smaller magnitude that represents the optical change in the particular magnetic actuator of interest. For example, the converter output signal TO can be similar to the curve in Figure 1. The reader rdR processes the converter output signal TO to obtain the read data rd (RDR[T〇;| => RD) in an appropriate format. The read data RD contains the aforementioned identification data. The controller CTRL receives the identification data from the reader RDR (IDeRD - CTRL). In step S3, the controller CTRL selects the general write strategy description WS* (CTRL: IDgWS*) based on the identification data including the type information. Symbol,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, WS2, WS3, ···. General Write Policy Description for Controller CTRL Selection WS* applies to the type to which the disc belongs. The controller ctrl will focus on one of the general write strategy descriptions Ws* loaded into the working memory (CTRL->MEMS:

* LD[WS*]). The controller CTRL further loads the write strategy implementation program PWS into the working memory (CTRL_MEMS: LD[PWS]). q In step S4, the controller CTRL executes the write strategy implementation program PWS.

The write strategy implementation program PWS processes the general write policy description WS* that has been selected in step S3. This causes the controller CTRL to generate the write strategy data WSD' which is explicitly applicable to the laser driver ldr (ctRL: PWS)

[W S ] 3 w S D). This generation of the write strategy data WSD will be described in detail below with reference to FIG. In step S5, the controller CTRL loads the write strategy data WSD into the laser actuator LDR (CTRL - LDR: LD [WSD]). The laser driver 〇 LDR has a functional behavior that depends on the write strategy data WSD that has been loaded into the laser driver LDR. More specifically, the write strategy data WSd causes the lightning driver LDR to provide a specific output signal that responds to the specific bit sequence of the channel encoder CHC applied to the laser driver LDR and drives the laser LA °. Explain this point. After the step S5 is completed, the disc recorder 〇dr is ready to be redundantly recorded on the disc. The data record contains the signal flow through the recording path, which will be described below with reference to FIG. The input interface INP of the optical disk recorder ODR receives the input signal IS, which can be analogous or digital signal to 121922.doc -19- 200818148. If the input signal IS is an analog signal, the input interface converts the input signal IS into a digital signal, which can be temporarily (IV) stored in the buffer memory. If the signal IS coefficient bit signal is input, the input signal IS can be directly applied to the buffer memory for temporary material. When the input signal path has different data rates, the input interface iNp can be converted into a data rate. Ο Ο The error correction encoder jail receives the write data WD from the input interface INP. The written data is representative of at least a portion of the input signal IS, which should be recorded on the first disc. Error Correction Encoder Prison Application WD Application Error Correction = Code Algorithm. Correspondingly, the wrong pure coded stomach coffee provides an error-protected ED that contains a given amount of redundancy. Even if the error protection data is partially damaged, the written data WD can be correctly taken out from the error protection material. The channel encoder CHC converts the error protection data ribs into channel coded data (3). The channel coded data CD has a format that facilitates optical recording. The channel coded data CD usually contains bit strings, which have the descriptions in Figures 2 and 3. The same value. Each string has a length that is included in a predefined range. For example, for the number of channel bits, the Blu-ray Disc standard defines a minimum length of 匕 and a maximum length of 8. A string corresponds to the mark on the disc. The mark should have a length corresponding to the length of a substring as illustrated in Figure 2. The zero string corresponds to the space on the disc. The space should have a length corresponding to the length of the zero string, as illustrated in Figure 2. The laser driver LDR generates the laser power 121922.d according to the channel coded data CD and the (4) device (10) 2 written into the laser driver LDR, and writes the LC 121922.d, -20-200818148 captures the LC. Write the strategy data WSD definition A specific type of laser current tc. For each possible length of a string in a channel coded material CD, there is a specific laser current pattern. Assuming a string of a given length See the i-way, flat code: bedding CD. In this case, the laser driver makes the #射流LC have a specific laser current type that belongs to the given -$ length specified by the write strategy data WSD. The specific laser current pattern shall be such that the laser LA writes a mark of a given length on the optical disc. The laser driver LDR plays an important role in the optical recorder ODR. The laser (R) and the optical interface E〇I effectively The substring within the channel coded data cd is converted to a mark on the disc. The mark should have an exact length that depends on the number of strings in the string to facilitate the disc player to accurately reproduce a string when reading the mark. More specifically, the mark should have a length within a narrower range, which is unique to a number in the relevant string. If the mark length is outside this specific range, ie if the mark is too short or too long, an error will occur. 1 , the laser driver LDR can reduce the probability of reading errors by writing the exact length of the lens. (Figure 6 illustrates the laser driver LDR 'which forms the disc record illustrated in Figure 4. $ bribe Part. Laser drive coffee contains The following functional entities: address • generator ADG, driver memory MEMD, FIFO buffer IF0 digital pattern generator DPG, and digital to analog converter Μ = = equal power positive entity constitutes the driver road # ' The channel-encoded data (3) is transferred to the laser current pattern. The driver path converts the channel-encoded data (3) into a laser-current pattern in a specific manner, depending on the write strategy data that has been loaded into the drive recorder MEMD. The laser driver receives the phase-locked loop PLL, which receives the channel clock signal CCK. For example, the aforementioned functional entities of the laser driver LDR can form an integrated circuit. For example, the drive memory MEMD can be in the form of random access memory. The laser driver LDR operates as follows. The address generator ADG receives the channel coded material CD, which may be in the run length coded form. In this case, the address generator ADG can apply run length coding to the channel coded data CD to obtain zero and one of the channel coded data CDs. ^ The address generator ADG identifies an individual string within the channel coded material CD. Each string constitutes a specific tag that needs to be written. The address generator ADG can include a lookup table that associates a particular address data ADD with a particular length that a string can have. When one of the strings of the specific length appears in the channel coded data CD, the address generator ADG generates the address data ADD belonging to a specific length. The address generator ADG applies this address data ADD to the drive memory MEMD. The address data ADD may indicate a single address or a set of addresses within the drive memory MEMD. W The write strategy data WSD stored in the drive memory MEMD contains the pattern _ definition for each length of a string in the channel coded data CD. The pattern definition defines a specific laser current pattern that produces a mark of the appropriate length. Each type definition is stored in a specific address or a specific set of addresses, as defined in the foregoing lookup table for the address information ADD of the relevant length. Subsequently, when a string of a given length appears in the channel encoded material CD, the drive memory MEMD provides a specific pattern definition PDF. The specific pattern definition PDF is a string of a given length. The buffer FIFO temporarily stores the continuous memory definition PDF provided by the drive memory MEMD in response to the contiguous address data ADD from the address AD922.doc -22- 200818148 generator ADG. Buffered FiF0 stores continuous pattern definitions on a first-in, first-out basis pdf. Accordingly, when the buffer FIF 接收 receives the read request RRQ from the digital pattern generator, the buffer FIF 〇 releases the pattern definition PDF that has been located in the buffer fif 最 for the longest time. • The digital pattern generator DPG converts the type definition PDF of the buffer FIF0 release into a series of sub-values SDV and an accompanying series of timing pulses Tp. 〇 For this purpose, the digital pattern generator DPG can include a set of registers RG1, RG2, RG3, ... and a timing circuit TIM, as illustrated in FIG. The individual temporary storages are RG1, RG2, RG3, ... and store individual digital values corresponding to individual laser current levels, such as gift, yes, and ~. For example, a model definition chat can include a number of bits that define a particular level by specifying a particular scratchpad. For example, the laser beam power pattern illustrated in Figure 2 includes the following laser power levels: bias level Pb, erase level Pe, and write level pw. The laser current LC has a corresponding level. The first temporary register RG1 in the digital pattern generator DpG can store the digital value DV1 corresponding to the bias level Pb. The second register RG2 can store a digital value corresponding to the erase level. The third temporary register RG3 can store the digital value DV3 corresponding to the write level Pw. Preferably, the digital model generator includes other registers that store so-called intermediate values. This will be explained in detail below. The reorder circuit TIM generates a 5 Hz series timing pulse τρ which is supplied with the aforementioned series of digital values SDV. Each digital value has two consecutive timing pulses. Two consecutive timing pulses: the first defined digit to the analog converter should start to convert the digital value - instant. The last definition of two consecutive timing pulses 121922.doc -23- 200818148 Analog to digital to (four) DAC should end the conversion of the digital value and begin to convert more than the other digital value of the digital value. Therefore, two consecutive timing pulses belonging to a particular number of values determine the time interval during which the analog converter should convert the particular digital value. The digital to analog converter DAC generates the laser current LC according to the series of digital sub-values SDV provided by the digital pattern generator DPG and the accompanying series of timing pulses TP. More specifically, i also said that the digital to analog converter dac converts the sign bit type f) # generator is the digital value provided when the most recent timing pulse occurs. In other words, the field current LC has a magnitude that depends on the digital value that the digital pattern generator DPG provides when the most recent burst occurs. Therefore, the laser current magnitude M[LC] can only be changed when a timing pulse occurs. The timing circuit TIM generates a series timing pulse TP according to the driver 'clock signal DCK received by the digital pattern generator DpG from the phase locked loop pLL. For example, the reordering circuit TIM can include a set of counting devices, which "receives the driver clock signal DCK. The individual counters are associated with the individual digital values specified by the pattern definition pD]p. The counter defines the digital value associated with the counter to determine the time interval during the laser current magnitude M[LC]. The PDF stylized individual, juicer, is defined according to the pattern so that the individual time intervals for the individual digital values correspond to the desired laser beam power pattern. In detail, the 'first counter' is associated with the first digital value that appears in the pattern definition pdf. The timing circuit TIM issues a timing pulse at the instant when the first counter starts counting. The first counter is programmed into a specific number of clock cycles of the counter count driver, which is defined in the pattern definition PDF. The specific number of drive clock cycles corresponding to the first digital value should determine the time interval during the laser power 121922.doc -24 - 200818148 :M[LC]. The timing circuit TIM has counted a certain number of M in the first tenth, and the younger counts the punch. The timing pulse is issued at the instant of the instant ...: period. The second counter ~, the second counter associated with the digital value. The system is centered to calculate the specific number of drive H clock cycles, which is defined in the PDF. The specific number of drive clock cycles is Ο Ο : During the time of the second period, the number of drives is equal to a certain number of drives. The momentary pulse of 1 is issued. Others can be stylized in a similar way. Tens of w provide other timing pulses for other digital values. The phase-locked loop PLL generates the driver clock signal (10) based on the channel clock signal. The phase-locked loop pLL operates as a frequency multiplexer. The driver clock "Tiger DCK usually has a frequency that is a multiple of the channel clock frequency. This multiple is called the frequency multiplication factor κ. The driver clock signal dck therefore has a period of the channel clock period divided by the frequency multiplication factor K. The clock signal DCK defines a time grid having a spacing equal to the clock period of the driver. The laser current magnitude M[LC] can only be varied at the grid point within the grid at this time. This is due to the timing circuit TIM being only available. Timing pulse at the grid point. For example, assume K = 5. In this case, for each channel clock period Tch, when the laser current magnitude M[LC] can vary, there are only five equally spaced intervals of dispersion. Instantaneous. The drive clock cycle thus defines a specific time resolution. Ideally, the laser current LC should produce a laser beam power pattern that fully conforms to the selected general write strategy specification WS*. Traditionally, the drive clock k number DCK A fine enough time frame should be provided to achieve this full 121922.doc -25-200818148 compliance with the laser beam power type. * n..., the grid should be included for switching according to the selected one The possible instantaneous moments of the beam power are to be a large number of grid points per channel-cycle clock cycle, and the frequency multiplication factor should be higher. For example, assume that Figure 2 represents 2 Ding's sentences are all U-shaped. Figure 2 shows that the shore is in the two τ"', into, ideal laser beam work

Pe_ Instantly sweeps the laser beam power from the erasing level 至 、 to the writing position 1^. This particular instant is located somewhere between the opening and ending of the channel clock cycle, and the two substrings that need to be written in the piggyback beforehand can express this particular instant as the distance for the first of the two zeros. A negative offset from the beginning of the clock cycle. A negative offset can be expressed as a fraction of the channel = period. Assume that the negative offset is equal to 3/ι〇 of the channel clock period. The lower frequency multiplication factor K should conventionally be 丨〇 so that the driver clock cycle is 1/1 of the channel clock period. The right channel has a higher clock frequency and achieves a fine enough time in the traditional way. Resolution may be difficult or even impossible. In the case of high-speed, high-density recording, for example, according to the Blu-ray disc standard, the channel clock frequency is high. The Blu-ray Disc is defined as the nominal channel clock frequency of 66 megahertz (MHz), which corresponds to the nominal channel clock period of 1 5 · 1 5 1 nanoseconds (ns). The nominal channel clock frequency is for standard playback speeds, which allows 66 million channel bits per second to be read. Door speed. Recorded can include writing r by 66 million channel bits on the disc, which is commonly referred to as the speed game factor, . The more the speed game factor R is, the faster the recordable amount of data can be. For example, 'Assume that the optical recording required by the Blu-ray disc standard requires a speed game factor R of 10. In this case, the channel clock frequency is 10 by 66 MHz. Pass 121922.doc -26- 200818148 The iiH period is 1,515 ns, which is 1/10 of the standard channel clock period. The 'driver clock cycle' should be provided for the time grid to select the second, and the strategy indicates the grid points for each power switching instant within ws*. False = Following this traditional reasoning, the driver clock cycle should be the channel clock cycle = (four) lower 'driver clock cycle should be 151•嶋), corresponding to the frequency of 6.6 gigahertz (GHz). Ο u 里6 counts work and complex processes, and its cost is high. It can also prove that the given existing Rosie Helmets are struggling with each other and know that the U-bike is now a fine pitch. Therefore, in the traditional way, the speed factor (4) is more expensive, or the existing one is not available. The solution to these problems will now be described with reference to Figures 7 through 12. Figures 7, 8, and 9 illustrate three injection pulses, a BP3, by thicker dashed lines, respectively. Figures 7, 8, and 9 each contain -= :, which has a vertical axis representing the time (in nanoseconds (four)) - the horizontal axis and the magnitude of the field current M[LC]. Vertical grid line grid. The spacing is equal to the driver clock period expressed as a shirt, which is 25 〇 ps (= 〇.25 〇 ns). The vertical axis indicates the bias level and the write level h. The three desired laser beam write human pulses LBpi, coffee 2, LBp3 can be considered as a simplified version of any of the write pulses illustrated in Figure 2 or Figure 3. Figure 7, 8, and ", prior to the three expected laser beam write pulse coffee, coffee 2, chat 3 dust position quasi-laser beam power conversion start level: low to south - general indication. For example 'Before the three expected laser beam write pulses BP1, LBP2, LBP3, the bias level pb can correspond to the wipe 121922.doc -27- 200818148 in Figure 2 except the level Pe. Similarly, after three expectations The bias level of the laser beam write pulses LBpi, LBP2, and LBP3 is generally indicated by the end level of the laser beam power transition from low to low. For example, after three expected laser beam write pulses LBPI, The bias level pb of LBP2 and LBP3 may correspond to the cooling level Pc in Figure 3. • In Figure 7, the laser beam power should be at the write bit during the time interval from 0·875 ns to 3.875 ns. Quasi-pw. In 〇·875(10), the laser beam power 0 仉 bias level % should be switched to the write level Pw, and should be switched back from the write level Pw to the bias level Pb at 3.875 ns. Figure 8 In the case, the laser beam power should be switched from the bias level Pb to the write level 5^ at 〇·95 μ, and should be switched back from the write level Pw to the bias level pb at 3.95 (10). in, The laser beam power should be switched from the bias level Pb to the write level pw at 〇·8 μ, and should be switched back from the write level Pw to the bias level at 3.8 ns. However, the time 袼It is not permissible to switch the laser current m[lc] at any such moment. Figures 7, 8, and 9 illustrate the laser current pattern in grayscale shading, respectively. Each rake current pattern will cause the laser to produce the same map. The desired laser beam write pulse is indicated, or at least a good enough approximation. This is possible, and • the laser current magnitude M[LC] can only be changed in an instant of multiples of 0.25 ns. It excludes any of the aforementioned transients that are characterized by individual desired laser beam write pulses. It should be noted that for simplicity, delays are ignored in Figures 7, 8, and 9, which may occur in a laser driver 1^ 3 and within the signal path between the laser LA. The individual laser current patterns include the write level pw and the bias level pb, which correspond to the write level pw and the bias level of the laser beam power, respectively. 121922.doc -28- 200818148 That is, when the magnitude of the laser current LC is at a rate, it usually has a write level Pw. When dry/, pww, the laser beam power is on when the laser beam is at the Pb level; the size M[LC] is at the bias level with the bias level Pb. The individual laser current patterns are further accurate. The threshold is common to the official A, 隹η " the following common points. In the laser beam, the sheep should be specifically written in the position, the current magnitude M[LC] is in the write encounter, the middle of the field, the quasi-PW. In Figures 7, 8, and 9, from 1 ns to 3.75 ns, Thunder φ ▲ Han y Ο u The radio size M[LC] is at the write level Pw. This is the most probable time grid", the singer of the singer, the 隹D ^ drought room ^ ' it is adapted to the time interval of the laser beam ^ ^ ^. The laser beam power should be specialized The clock period of each driver during the bias level Pb is small, M[LC] is at the bias level Pb. Because of the Tianhe Ding motor, in Figures 7, 8, and 9, from 〇 to 75 ns And from 4·〇ns or more, φ pressure level pb. "射U小m[lc] is shown in the partial map of the laser Leifa penalty # sample contains 50% of the intermediate level Pi50%, its bias The pressure level Pb is in the middle of the write level Pw. The laser current magnitude M[LC] is at the 50% intermediate level of the driver clock period 〇MU·75 to 10 ns Pi5 0°/〇. During the period, the laser beam power should be switched from the bias level P b to the write level pw. $ ο 〇 / by / + w 50 /. The intermediate position (10) is valid with "π ns A dust-to-write level transition occurs within the laser beam power at the transition point. This system should switch the laser beam power from the bias level to the write level.

The precise moment of Pw. In other words, the bias-to-write level transition produced by the nano-level pi5Q% substantially corresponds to the bias-to-write level transition that has been obtained if G 875 is switched, such as switching the laser current LC. The laser current magnitude M[LC] is in the driver clock cycle 3 75 to 4 () μ period 121922.doc •29- 200818148 is also at 50% of the intermediate level pi5〇%, where the laser beam power should be written from the bit The quasi-Pw switches back to the bias level pb. Here, the 5〇% mid-level produces a write-to-bias level transition within the laser beam power with an effective transition point of 3.875 ns, which should switch the laser beam power back from the write level pw The moment to the bias level. Bias generated by 50% of the intermediate level Pi5〇% • The write level transition essentially corresponds to the write-to-bias level transition that has been obtained if the laser current LC is switched at 3.875 ns. f) The laser current pattern illustrated in Figure 8 contains 20% intermediate level Pi2〇% and 80% medium _ quasi Pi8G%. The middle level pi2Q% corresponds to the bias level Pb, which has added another % of the difference between the write level pw and the bias level. The 80% intermediate level Pi8G% corresponds to the partial level limit, and #8〇0/〇 of the difference between the write level Pw and the bias level Pb has been added. The laser current magnitude M[LC] is at the 0/〇 intermediate level ρι2() during the driving ϋ clock period 〇 75 to 1 〇 (10). /. Where the laser beam power should be switched from the bias level Pb to the write level Pw. The 2〇% intermediate level produces a bias to write level transition within the laser beam power with 〇·% (J Μ effective transition point. This should be the laser beam power from the bias level pb . The precise moment.- The partial factory generated by the middle position ^^^== 4 The transition essentially corresponds to if the laser current is switched at 〇.95ns (4), the obtained partial offset is changed to the write level change. [LC] is at _ intermediate level % during the driver clock cycle 3 75 to 4 ns, where the laser beam power should be switched from the write level Pw back to the bias level Pbe here, 8〇% The median level % is written to the bias voltage 121922.doc -30- 200818148 T quasi-transfer in the laser beam power with an effective transition point of 3.95 ns. This should be the laser beam power from the write bit. The quasi-Pw switches back to the precise moment of the bias level Pb. The 8〇% intermediate level ^(10)% is generated to the flat [4 quasi-transfer 对应 对应 corresponds to if the laser current is switched at 3 · 9 5 ns The LC has obtained the write-to-bias level change. _ 囷9 The temperature of the laser current also contains 2〇% of the intermediate level pi2〇% and • 8G/° the intermediate level Pl8G% ° However, Such The inter-level has a swap position relative to that of Figure 8. The laser current magnitude M[LC] is at 80% of the intermediate level Pi80% during the driver clock period 〇.75 〇 to 丨.0(10), where the beam power should be Switching from the bias level Pb to the write level pw. The magnitude of the laser current is at the intermediate level of the driver clock cycle 3·75 to 4

Pl2 〇 / °, where the laser beam power should be switched back from the write level Pw to the bias level Pb. In Figure 9, 80% of the intermediate level Pi 80% produces a bias to write level transition within the laser beam power having an effective transition point of 〇·8 ns. This system should switch the laser beam power from the bias level Pb to the write level! The precise moment of ^. 2〇% 〇' The intermediate level Pi20% produces a write-to-bias level transition within the laser beam power with an effective transition point of 3·8 ns. This system should switch the laser beam power from the write bit • Pw to the exact moment of the bias level Pb. The bias-to-write level transition produced by the 80% t-inter-level 80% corresponds substantially to the bias-to-write level transition that has been obtained if the laser current LC is switched. The write-to-bias level transition produced by the 2〇% intermediate level Pi20% substantially corresponds to the write-to-bias level transition that has been obtained if the laser current LC is switched at 3.8 ns. Figures 7, 8, and 9 illustrate a finer time gate that can be effectively converted to a point within the laser beam power by one or more intermediate bits being admitted to the laser 121922.doc 31 200818148: Appears at the moment between two consecutive grid points in the time grid. Can be defined by selecting the appropriate intermediate level and having a large amount of elaborate β β ^ half & meaning has a more linear relationship between the intermediate level and the instant when the effective transition point appears to be more than 0±, °, and 9 § . The effective transition point of the n-to-write level shift is located between the milky =, the system driver clock cycle (four) · 75 to 1G ns. this

Ο The emission current LC is in 5〇% of the clock period of this driver

Pi50〇/o 〇 In Figure 8, the effective transition point for the bias-to-write level transition is at .... Regarding the driver clock period, the effective transition point is 2% higher than the grid point corresponding to 1 〇 ns. This is because the laser current a is at the 2 ()% intermediate level ρ_ within the driver clock period G.75M. 〇 ns, which ends at this grid point. In Figure 9, the effective transition point of the bias-to-write level transition is at 〇. "s. Regarding the driver clock period, the effective transition point is 80% ahead of the grid point of the corresponding heart (10). This is due to the laser current lc In the driver clock cycle period 0.75 to 1. 〇 ns 2 〇% intermediate level pi2 〇%, which ends at this grid point. ^ In Figure 8, the effective transition point of the write human to bias level transition appears in I% ns. Regarding the driver clock period, the effective transition point is 80% after the grid point corresponding to 3 is (10). This is because the laser current LC is in the 80% mid-position of the driver clock period 3.75 to 4.0 ns. Quasi-pi8〇%, which starts at this grid point. In Figure 9, the effective transition point written to the bias level transition occurs at 3.8 ns. Regarding the driver clock period, the effective transition point ratio corresponds to 3.75 The grid point is pushed back by 20%. This is because the laser current LC is at the 2Q% intermediate level pi2Q% of the driver's clock period 121922.doc -32- 200818148 』3.75 to 4.G ns, which starts at this grid Thumbs up. Figures 10 and 11 illustrate the actual results obtained by introducing the above-mentioned intermediate levels with reference to Figures 7, 8 and 9. Figure 10 is a song a line graph having a horizontal axis representing the time r τ (in nanoseconds (ns)) and a vertical axis representing the magnitude of the laser current M[]LC]. FIG. 11 is a curved line diagram having Represents the horizontal axis of time τ (unit is not secret (ns)) and the vertical axis representing the laser beam power pw. f) The actual results described in Figures 1 and 11 have been used in the mine described in Figure ό The driver driver LDR is obtained. The driver clock period Tdr is 250 ps. The two laser current pulses generated by the laser driver LDR can be generated. · Standard laser current pulse scp and so-called power control conversion laser (9) L pulse XCP. The standard laser current pulse generated by scp does not have any intermediate value. The digital pattern generator DPG is applied to the series of digital values SDV of the digital analog converter with an immediate transition from the bias level to the write level Pw. Having an immediate transition from the write level Pw to the bias level pb. Correspondingly the 'digital to analog converter DAC converts the number of sub-values corresponding to the level Pb during the first time interval, followed by a second Conversion pair during the interval, should be written to the level Pw The digital value, and finally during the third time interval, converts the digital value corresponding to the bias level Pb. Each time interval corresponds to a specific number of driver clock cycles of the type of PDF meaning. A voltage control transition laser current pulse xcp is generated between the bias level pb and the write level pw illustrated in FIG. 7 and between the write level Pw and the bias level pb by a 5% intermediate level MM%. Referring to Figure 6, the digital pattern generator DPG includes a register that stores values corresponding to the number 121922.doc -33 - 200818148 of 50% of the intermediate level pi5〇%. The series of digital values SDv provided by the digital pattern generator DPG comprises, in sequential order: - a digital value corresponding to the bias level pb; - a digital value corresponding to 50% of the intermediate level pi5〇%; - corresponding to the write The digital value of the level Pw; - the digital value corresponding to 50% of the intermediate level Pi5〇%; ^ - the digital value corresponding to the bias level Pb. () As in the case of a basic current pulse, the digital-to-analog converter DAC converts each of these digital values during a specific time interval of the clock cycle of a particular number of drivers that should be defined by the type pdf. The power control transition laser current pulse XCP illustrated in Figure 10 has a bias voltage that is relatively flat and occurs earlier than the corresponding transition of the standard laser current LC pulse to the write level. Similarly, the power control transition laser current pulse XCP has a flatter and write-to-bias level that occurs earlier than the corresponding transition tip of the standard laser current LC pulse. Q Figure 11 illustrates two laser beam power pulses: a standard laser beam power pulse SLP and a time-biased laser beam power pulse XLp. Standard Laser Beam Power Pulse The SLP responds to the standard laser current pulse SCP illustrated in Figure 10 from the laser LA. The time-biased laser beam power pulse is again responded to by the power control transition laser current pulse XCP illustrated in Figure 1 from the laser [Α. The time-biased laser beam power pulse XLp appears to be 125 ps higher than the standard laser beam power pulse SCP. As described above, this has been achieved by introducing a 50 〇/〇 intermediate level Pi 50%. It is important to note that the individual laser beam power pulses SLP, XLp have a similar shape to the real 121922.doc -34-200818148. More specifically, the bias-to-write level transition and the write-to-bias level transition are similar regardless of the difference between the corresponding transitions in the individual laser current pulses SCP, XCP as illustrated in Figure 丨0. Since the individual laser beam power pulses SLP, XLP have substantially similar shapes, the pulses will affect the optical recording material in a similar manner. The standard laser current pulse SCP and the power control conversion laser current pulse XCP will produce similar shapes on the disc. Accordingly, by introducing an intermediate level, an accurate inter-distance offset without distortion can be achieved. C) Figures 7 through 11 are particularly suitable for both of the following conditions. First, the laser L A has a relaxed oscillation period which is greater than the drive clock period Tdr. Second, the laser Εα can experience an effective control pulse having a typical rise time that is less than the relaxation oscillation period of the laser la. The effective control pulse originates from the output pulse of the laser driver LDR, which is effectively filtered by the electrical network extending from the laser driver LDR to the laser LA, including the laser LA itself. That is, the laser LA has a given electrical impedance that forms part of this electrical network.右 Right The above conditions regarding the relaxed oscillation period and the typical rise time are not suitable for the intermediate level after the so-called pre-pulse. Pre-pulse system lightning. The time interval at which the emission current LC is lower than the critical level, which is related to the laser LA. The critical level of the Liantian injection LA constitutes the on/off point: the laser B is higher than the laser current LC respectively. Or effectively turn on or off below the critical level. Phase a also introduces an on-delay in the pre-pulse, which is a typical dynamic response of the laser, hopper 1, V- such as ^, "" The turn-on delay helps to translate the intermediate level into a hand-off offset, especially if the aforementioned conditions are not applicable. Back to 2 1 3, and 14 respectively to indicate the replacement of the pre-pulse with gray-scale shading. 121922.doc -35- 200818148 Laser current type. In addition to the pre-pulses, Figures 12, 7, 8, and 9. Figures 12, 13, and 14 indicate that they do not correspond to the boundary Pth. The pre-pulse is associated with the field. This driver clock cycle is 5 to 75·75 ns Γ The pulse of the second appears before the laser current is large, and Lc] is in the middle $ exactly 0.75 to 1. 〇ns. Thousands of people are swaying for the clock cycle Ο Ο Figure 15 illustrates the introduction of the intermediate level of the written policy. The data contains the - series of steps (4), ' ° ^. Write the part of strategy S4. When the write h S4_6' is executed, it forms the step of FIG. 5, and the controller CTML of the program is executed to execute the steps. That is, the write strategy 2 = PWS contains a set of instructions that cause the controller CTRL to perform the write strategy calculations described in Figure U. The writing strategy data calculation is based on the second (four) WS* and the laser drive one of the actuator clock cycle: ;, in step S4_1, the controller CTRL will exist in the general write of the selected write strategy into the WS* The pulse indicates that the WRP is loaded into the work buffer (WRPeWS). The general write pulse indicates that the WRp definition should switch the laser beam J rate from the bias level Pb to the specific instant of writing the level 1^. This is called the power-on switching instant Tsu. The general write pulse indicates that the WRp advance-step definition should 'cut the laser beam power from the write level pw to the bias level.

Another specific moment of Pb. This moment will be referred to as the power-off switching instant Tsd (WRP: Tsu, Tsd). In step S4-2, the controller CTRL calculates the number of energized grids (5) and energizes 121922.doc -36- 200818148 grid offset T〇 Ffu (TSU=GU.Tdr-T〇ffu). The number of energized grids is the natural number of the grid points (GueK), that is, the drive clock period is multiplied by the number of grids Gu. The calculated number of energized grids is defined as energized: the best approximation of the instantaneous Tsu is at the same time the grid point is slightly later than the instant. This grid point will be referred to as the power grid point below. Calculated power grid offset

Toffu is the difference between the power-on switching instant Tsu and the power-on grid point. Correspondingly, the energized grid offset Toffu is included in the zero (〇) and driver clock cycles: Ο Ο

A rational number within the range between Tdr(T〇ffrem<0, Tdr>). Conversely, when the driver clock period Tdr is multiplied by the number of energized grids Gu, which multiplies the energized grid point and subtracts the energized grid offset 从 from the energized grid point, the power is switched instantaneously. In step S4·3, the controller CTRL calculates the energization intermediate level Piu (Piu=Pb quasi-sum sum is obtained by the energization intermediate level Piu. The energization offset level is equal to the write bit, and the difference between the bias level and the bias level is multiplied. To normalize the power grid offset. The mind normalization grid offset is equal to the power grid offset To hate to drive the crying clock period Td" ie the 'standardized power grid offset to drive the time period Tdr as the soap level The difference between the energization switching instant Tsu and the energized grid point is expressed. The energization intermediate level Piu is changed proportionally with the (normalized) energization grid offset Ding. The closer the energization switching instant Tsu is to the energized grid point, the energization grid offset The smaller the T〇ffu is, the closer the energization intermediate position is to the bias level: ^ The electric knife is changed _ The farther the TSU is from the power grid point, the larger the power grid is, the larger the power is, the higher the power level is, and the power is intermediate. The closer the in-place pw is, the closer the step S4_4t 'controller' is to calculate the number of power grids (5) and the power grid offset T〇ffd (Tsd = in a manner similar to the above steps (4) 121922.doc -37- 200818148. Gd.Tdr+Tc)ffd). The number of broken grids is defined by the natural number of the grid points (6), that is, the drive clock cycle Tdr is multiplied by the number of power grids: the number of power grids (10) is defined as the moment of power-off switching. The approximation is also a grid point that is slightly earlier than the instant. This grid point will be referred to below as the break point.瞀 瞀 & .· 、, 、^ The power grid offset Toffu is the power-off switching instant Tsd and the power-off grid 4 points 夕pq Α γ 呵 电 心 之间 。 。 。 。 。 The 〇 系 ffd package is a rational number in the range between zero (0) and the driver clock period Tdr ( (10) 〇 'Tdr>). Conversely, when the driver clock period Tdr is multiplied by the power grid The number (5), the multiplication provides the power grid point, and the power grid offset TGffd is added to the power grid point to obtain the power-off switching instant Tsd. In the y钵S4 5, the control state CTRL calculates the power-off intermediate The level pid (pid= Pb + (T〇ffd/Tdr). (PW-Pb)). The power-down intermediate level pid is obtained by summing the deviation of the level and the power-off offset level. The offset level is equal to the difference between the write 〇 level Pw and the bias level Pb multiplied by the normalized power grid offset. The normalized power grid offset is equal to the power grid offset Toffd divided by the drive The clock cycle Tdr. That is, the normalized power grid offset represents the difference between the power-off switching instant Tsd and the power-off grid point in units of the pulse period Tdr of the driver. The quasi-Pid is proportionally less than the (normalized) power-off grid offset T〇ffd. The closer the k/f electric switching instant Tsd is to the power-off grid point, the smaller the power-off grid offset Toffd is, and the power-off is in the middle. The closer the level pid is to the bias level, the opposite is. The farther the power-off switching instant Tsd is from the power-off gate point, the larger the power-off grid offset Toffd is, the power-off intermediate level Pid and the write level pw 121922.doc -38- 200818148 In step S4_6, the controller CTRL prepares a write pulse generation parameter which is transmitted to the laser driver LDR. The write pulse generation parameter may constitute the generality mentioned above with respect to step S4-1. The write pulse indicates the translation of WRp. The write pulse generation parameter is defined at the pulse period just before the power-on grid point. During the period Tdr, the laser current LC should have an energized intermediate level piu, or enough. The approximate value, that is, in terms of the number of grids, the laser current LC should have. The number of grids Ο11·1 (which happens to precede the number of energized grids Gu) and the number of grids of the grids GU itself itself. (PiU@[(Gd-l).Tdr,

Gd’Tdr]). The write pulse generation parameter is further defined during the driver clock period Tdr immediately following the power-off grid point, and the laser current of 1 €: should have a power-down intermediate level Pid, or a good enough approximation. That is, in terms of the number of grids, the laser current LC should have an energized intermediate level pui between the number of grids Qd and the number of grids Gd+1 followed by the number of grids Gd (pid@ [Gd.Tdr, (Gd+l).Tdr]). As noted above, the register U sets RG1, RG2, RG3, ... within the laser driver L] Dr illustrated in Figure 6 contain a set of digital values that can be applied to a digital to analog converter DAC. For example, the laser driver ldr may include a temporary memory that stores a value corresponding to the 50 〇/〇 intermediate level Pi 50% illustrated in Figure 7. The laser driver LDR may include other registers for storing individual digital values corresponding to individual intermediate levels (e.g., in units of 1%). Correspondingly, the laser driver LDR can set the laser current B (:: set to 20% of the intermediate level pi2〇% and 8〇% of the intermediate level pi8〇% as illustrated in Figures 8 and 9. In this example, Ray The laser driver LDR can further set the laser current lc to the intermediate levels of 10%, 30%, 40%, 60〇/〇, 7〇%, and 9〇%. 121922.doc -39- 200818148 In Figure 12 The illustrated 耷t ... bundle: the intermediate level calculated in the billimeter calculation may not correctly correspond to any number of rich values in the storage LDO. In this case, the write strategy is cautious - mp ^ 朿略贝枓汁舁 can round the calculated energized intermediate level Pm to the nearest possible level of the digital value a,# in the laser drive LDR. The register group RG1, RG2, RG3, , ^, m 咏^ ··· in the emitter driver LDR contains individual digital values corresponding to the intermediate levels that have been counted. Ο υ Reference pattern The above detailed description & * is only an explanation of the present invention and additional features defined in the scope of the patent. The invention can be varied in many different ways. To illustrate this point, briefly indicate some alternatives. This description can be applied to record any class # ^ first disc, which can be rewritable light 2 disc or: write once type W, refer to The picture of the rewritable optical disk has an immediate transition from the erasing level Pe to the writing position qu. This immediate ^ can be replaced by a step-wise transition according to the invention, which includes chronologically configuring the erasing level. The pe盥耷pingxing writes the intermediate level between the level pw. In this example, the erase level Pe is used to leave the static level of the space as shown in Fig. 2. As another Example, moxibustion, test on the write-once type disc, Figure 3, there is an immediate transition from the bias level to the first - soil spear-input position Pw2. This immediate transmission can be based on this hair + 'month step The type transition is substituted, which includes chronologically arranging the intermediate level between the bias level and the P-input level Pw2. In this example, the bias is used to leave as shown in Figure 3. The static level of the illustrated space. The laser drive signal according to the present invention can have many different patterns. 7, 8, 9, 12, 13, and 14 only illustrate some examples. In these examples, the Ray 123922.doc -40-200818148 shoot drive signal has an intermediate level time period. Although the foregoing is preferred, this time Gate 2: -. Driver clock multi-driver clock cycle. Similar explanation applies ^ can contain two or more pre-pulses. Pre-pulse length can provide paste for 13, 14 gentleman * Eve driver clock Cycles. According to the laser driver of the present invention, only one example is described, and i + U wood is used in different ways. Figure RG2, RG3, which allows the laser driver to contain individual registers (10), 个别 individual values of the _ it: = for the laser _ corresponding to the register to specify a specific level. As a different example, a specific level is defined by reference. The definition of this type is clear and the right mA is from a yoke scheme. The laser driver does not need the aforementioned individual registers RG1, RG2, RG3. As: Medium consumption: 'In the optical recording body that only needs to process - some different types of optical discs, the area dynamic does not need to contain programmable memory. That is, the laser drive = only a single write strategy is implemented, which can be used Read-only memory or cloth, (4) series. The important laser driver can provide the model with the intermediate level according to this specification. The time switch that has been switched according to the expectation and belongs to the laser driver signal There are many different ways of the intermediate level. Figure 15 only illustrates an example. For example, time: shift can refer to the grid point before or after the desired switching instant. In addition, the time shift should be independent of the linear function. The intermediate level can be a nonlinear relationship between the time offset and the intermediate level. In this case, the ruthlessness is calculated by the nonlinear equation or its approximate equation reflecting the nonlinear relationship. There are many ways to implement functions by hardware or software projects or both. 121922.doc -41 - 200818148 About this point 'The pattern is only the sound and the 眚# n W Θ, /, each represents only this One of the inventions It can be practiced. Therefore, although L ^ martial arts show different functions in different squares, this does not exclude a single hardware or software member from performing several functions. It is also excluded by hardware or software projects or going to $14 # The fittings of both of the shells perform a function. The above explanation demonstrates the detailed gO ^ , the syllabus of the model, and does not limit the invention. There are many alternatives, Fang Gangs η, which are attached patents. The scope of the scope ^. Any applicant/examination in the scope of patent application should not be considered as limiting the application Ο 专利 patent consumption. The term "include" 卄3 does not exclude from the scope of the patent application. Other elements or steps - - , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a composite diagram illustrating a program read from a rewritable optical disc. Figure 2 is a composite diagram of a program recorded on a rewritable optical disc. Fig. 3 is a signal diagram showing a procedure recorded on a write-once optical disc. Figure 4 is a block diagram showing an optical recorder. Fig. 5 is a flow chart showing a plurality of operations performed by the optical disk recorder when a user inserts a recordable optical disk. Figure 6 is a block diagram showing the laser driver forming part of the optical recorder. Figures 7, 8, and 9 are signal diagrams illustrating the desired laser beam write pulse and the laser current pattern associated therewith, respectively. Figure 1 shows a lanthanide signal diagram illustrating two actual laser current pulses that can be generated by a laser driver. Figure 11 is a signal diagram illustrating two laser beam power pulses from two actual laser current pulses. Figures 12, 13, and 14 are signal diagrams illustrating desired laser beam write pulses and their associated alternate laser current patterns, respectively. Figure 15 is a flow diagram illustrating the calculation of the appropriate stylized write strategy data for the laser driver. [Main component symbol description] ADG address generator CCK 〇 Receive channel clock signal CHC Channel encoder CKG Clock generator CTRL Processor DAC Digital to analog converter DPG Model generator DRM Disk rotation motor DSK Disc 〇 EGI Photoelectric interface ERC error correction encoder FIFO FIFO buffer INP input interface ^ LDM loading mechanism LDR laser driver MEMD memory MEMS system memory 〇 DR optical recorder 121922.doc -43 - 200818148 PWS write strategy implementation RCD Remote Control RDR Reader RG1 Register RG2 Register RG3 Register TIM Timing Circuit TR Optical Track Ο 922 121922.doc -44-

Claims (1)

200818148 X. Application for patent scope 1. An optical recorder (〇DR) that includes a laser driver (LDR) for generating a laser drive signal (LC) aligns the laser drive on a time grid having a given pitch (10) The level change in the signal (Lc) is configured to be provided by the laser drive signal (LC), which is configured to be chronologically arranged for use on a disc (TR) An intermediate level (Pi50%) between the left-space-stationary level (10) and the person-marked-written person level (pw) on the optical disk track (TR), The intermediate level (pi5〇%) is included between the static level (Pb) and the write level (Pw). The optical delta recorder of claim 1, the laser driver (LDR) being configured such that the pattern of the laser drive signal (LC) comprises chronologically configuring the rest level (Pb) and the A pre-pulse level between the intermediate levels (Pi5〇%) is lower than a critical level associated with the laser (la) coupled to receive the laser drive signal (LC) ( Pth). Ο 3 · The optical recorder of claim 1, the laser driver (ldr) comprising a memorandum (MEMD) for storing an individual type definition for the laser drive signal (Lc) PDF); an address generator (ADG) for continuously reading one of the individual pattern definitions (PDF) from the memory (MEMD) according to an input data signal (CD); and generating a pattern The device (DPG, DAC) is configured to generate the laser drive signal (LC) based on the individual pattern definition (pDF) continuously read from the memory (MEMD). 121922.doc 200818148 4. The optical logger of claim 3, the pattern generator (DPG, DAC) comprises: individual registers (RG1, RG2, RG3, ...), which can be defined as one type (PDF) Individually specified to store individual values (DV1, DV2, DV3, ...) corresponding to the individual levels (Pb, Pw, Pi50%, ...) that the laser drive signal (LC) can have; and a digit to An analog converter (DAC) for providing the laser drive signal (LC) according to the individual values (DV1, DV2, DV3, ...) stored in the individual registers (RG1, RG2, RG3, ...) ). 5. The optical recorder of claim 4, wherein the individual values (DV1, DV2, DV3, ...) corresponding to the individual intermediate levels (Pi20%, Pi50%, Pi80%) are stored in the individual registers (rgi, Within RG2, RG3, ...). 6. The optical recorder of claim 4, the pattern generator (DPG, DAC) comprising a timing circuit (TIM), which can be programmed by a type definition (PDF), the timing circuit (TIM) The system is configured to provide a series of timing pulses (TP) that define individual time intervals for converting individual values (DV1, DV2, DV3, ...). 7. The optical recorder of claim 1, the optical recorder comprising: a system memory (MEMS) for storing a write strategy specification (WS1, WS2, WS3, ...), the definition of which should be laser The switching power is switched from one level (Pb; Pw) to another switching point (Tsu; Tsd) of another level (Pw; Pb); and a processor (CTRL) configured to assign a middle bit Piu (Pid) gives a time interval to define the type of laser drive signal (LC) 121922.doc 200818148, which is the two grids between which the switching instant (Tsu; Tsd) is located Point is defined, the intermediate level (piu; pid) is the one level (four) from which the laser beam power should be switched; ρ%) and the other that should be switched to the laser beam power Level (~ between 8. 8 - Laser Drive (LDR)' is used for optical recorders (ODR) such as Requests 〇 9. Ο Ο Optical by generating a laser drive signal (LC) a recording method for aligning a level change in the laser drive signal (LC) on a thumb having a given pitch (Td〇, The method comprises: a sample generating step, wherein the laser driving signal (Lc) has a pattern including an intermediate level (Pl50〇/o), wherein the intermediate level (center) is configured in time series A static level (Pb) leaving a space on the _optical track (TR) and a writing level (PW) for writing a mark on the optical disk (TR), the middle The level (Pi50%) is included between the dream level (Pb) and the write level (Pw). 10. A definition based on the write strategy description (ws*) for one of the discs. a method of one of the laser drive signals (LC) whereby the level change in the drive signal (LC) is aligned on a time grid having a given pitch (Tdr), and thereby The write strategy specification (ws*) defines a switching instant (Tsu; Tsd) at which the laser beam power level (Pb, Pw) should be switched to another level (Pw). Pb), the method includes an assignment step (S4) in which an intermediate level (piu; pid) is assigned to the (Tsu, Tsd) bit by 121922.doc 200818148 j The two grid points therebetween define one inter-turn interval, and the intermediate level (Piu; Pid) is included in the one level (pb; pw) from which the laser beam power should be switched and the laser should be The beam is switched between the other level (Pw; pb). 11. The method of claim 10, the method comprising: a calculating step (team 3; team 5), wherein the switching instant (Tsu; Tsd) and a time difference between one of the grid points adjacent to the switching instant Ο (offu, Toffd) is a functional relationship and the intermediate level (pi. Pid) is calculated. 〇12·If the method is on the item! In the calculation step, the intermediate level (Piu · ' Pid) is calculated. According to this function is a substantial linear function. 13. The method of claim 12, wherein in the calculating step, the time difference (Toffu, Toffd) is multiplied by the one level (Pb · 'pw) from which the laser beam power should be switched and should be One of the differences between the other level (Pw; Pb) to which the laser beam power is switched. 14. A computer readable medium having stored thereon a computer program comprising a set of instructions which, when loaded into an instruction execution device, cause the instruction execution device to perform a method as claimed in claim 1. 1 5 · A signal (LC) for driving a laser (la) in an optical recorder (〇DR), which is aligned on the gate with a given pitch (Ding) a level change in the shot drive signal (LC) having a pattern comprising a chronologically arranged level of a position to leave a space on a disc track (TR) ( Pb) is an intermediate level between the writing level (Pw) used to write a mark on the optical disk (tr) of the optical disk 121922.doc 200818148 (Pi50%), the intermediate level (Pi50%) ) is included between the resting level (Pb) and the writing level (Pw). Ο υ 121922.doc