JP2006172567A - Recording method, program and recording medium, and information recording device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To make it possible to perform recording having high recording quality to an optical disk at high speed without causing the increasing of the scale of an information recording device and the increasing of the cost of the information recording device. <P>SOLUTION: In an information recording device of the present invention, when a recording linear velocity is changed, ratios of respective pulse widths to the period of channel clocks are made to remain as they are, and luminous power Pp of a center part and a power ratio ϕ are updated respectively according to the new recording linear velocity every length of a mark (steps 421 to 429). As a result, since the number of setting items which are to be updated according to the change of the recording linear velocity in a plurality of setting items specifying recording conditions can be remarkably decreased as compared with that in the convention device, it becomes possible to update the recording conditions to appropriate values by following the change of the recording linear velocity. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a recording method, a program and a recording medium, and an information recording apparatus, and more specifically, a recording method and information recording apparatus for recording information on an optical disc, a program used in the information recording apparatus, and the program recorded therein. The present invention relates to a recording medium.

  In recent years, with the advancement of digital technology and the improvement of data compression technology, CD (compact disc) and DVD (digital versatile) are used as information recording media for recording large amounts of information such as computer programs, music data, and video data. Disc) and other optical discs have attracted attention, and along with the reduction in price, optical disc devices for recording and reproducing information on optical discs have become widespread.

  In this optical disc apparatus, laser light is emitted from a light source, a minute spot is formed on the recording surface of the optical disc on which spiral or concentric tracks are formed, information is recorded and erased, and reflected light from the recording surface is reflected. Based on this, information is reproduced.

  By the way, in the optical disc, information is recorded by the lengths of mark areas and space areas having different reflectivities and combinations thereof. Therefore, when recording information on the optical disc, the power of laser light emitted from the light source (hereinafter also referred to as “light emission power”) is controlled so that a mark area and a space area are formed at predetermined positions, respectively. .

  For example, marks are formed on optical disks that can be written only once, such as CD-R (CD-recordable), DVD-R (DVD-recordable), and DVD + R (DVD + recordable), which contain an organic dye in the recording layer. When this is done, the emission power is increased to heat the dye, causing alteration and decomposition, and further altering and deforming the disk substrate portion in contact therewith. On the other hand, when the space is formed, the light emission power is reduced to the same level as during reproduction so that the dye does not change or decompose, and the disk substrate does not change or deform. As a result, the reflectance of the mark is lower than that of the space. The light emission power when forming the mark is also called recording power. The light emission power during reproduction is also called reproduction power.

  Further, when forming a mark, a rule (e.g., a light emission power pulse shape) called a recording strategy is used in order to keep the heat distribution substantially constant even if the length of the mark or the length of the space immediately before and after the mark changes. Based on the method, the pulse shape of the light emission power is set (see, for example, Patent Document 1). An appropriate pulse shape or the like for obtaining good recording quality differs depending on the recording linear velocity.

  There is a CAV (Constant Angular Velocity) method as one of the methods for controlling the rotation of the optical disc when information is recorded on the optical disc. In this CAV method, information is recorded while rotating the optical disk at a constant angular velocity, so that the recording speed can be made faster than the CLV (Constant Linear Velocity) method and the rotation control of the spindle motor is easy. This has the advantage that the spindle motor can be miniaturized. Therefore, the CAV method is a method suitable for reducing the size and weight of the optical disc apparatus.

  However, in the CAV method, the recording linear velocity increases as the recording position moves to the outer peripheral side of the optical disc, so that the setting value defining the pulse shape and the like stored in the register may not be appropriate during the recording operation. . If the recording speed is further increased in the future, recording under appropriate recording conditions becomes difficult, and the recording quality may be deteriorated.

JP 2001-155339 A

  The present invention has been made under such circumstances. The first object of the present invention is to perform high-speed recording with excellent recording quality on an optical disc without increasing the size and cost of the information recording apparatus. It is to provide a recording method that can be performed.

  The second object of the present invention is executed by the computer for controlling the information recording apparatus, and is excellent in recording quality at a high speed with respect to the optical disk without causing an increase in size and cost of the information recording apparatus. It is an object of the present invention to provide a program that enables recording and a recording medium on which the program is recorded.

  A third object of the present invention is to provide an information recording apparatus capable of performing high-speed recording with excellent recording quality on an optical disc without causing an increase in size and cost.

  According to the first aspect of the present invention, in order to heat the recording surface of the optical disc corresponding to the mark, the light emission power at the front part and the rear part is larger than the light emission power at the central part, and each light emission power is reproduced. A recording method of recording information on the recording surface by causing a light source to emit light in a pulse shape larger than power, and when the recording linear velocity changes, for each mark length, the light emission power of the central portion, The recording method includes a step of updating a power ratio, which is a ratio of at least one of the light emission power of the front part and the rear part and the light emission power of the central part, according to a new recording linear velocity.

  According to this, when the recording linear velocity changes, the ratio of the light emission time of each light emission power to the period of the recording clock is kept as it is for each mark length, and the light emission power in the center part, the front part and the rear part The power ratio, which is the ratio of the light emission power of at least one of the light emission power and the light emission power at the center, is updated according to the new recording linear velocity. In this case, since the number of setting items to be updated according to the change in the recording linear velocity among a plurality of setting items that define the recording conditions can be greatly reduced compared to the conventional case, the change in the recording linear velocity Following this, it is possible to update the recording condition to an appropriate value. Therefore, as a result, it is possible to perform recording with excellent recording quality at a high speed without increasing the size and cost of the information recording apparatus.

  In this case, as in the recording method according to claim 2, in the updating step, the amount of heat supplied to the recording surface when the first mark having the shortest length is formed, and the first mark The power amount ratio, which is the ratio of the heat amount supplied to the recording surface when forming a second mark longer than the second mark, matches the known heat amount ratio corresponding to the new recording linear velocity. The ratio can be updated.

  In this case, as in the recording method according to claim 3, the heat quantity ratio is acquired in advance for a plurality of recording linear velocities, and a plurality of the heat quantity ratio and the recording linear speed are obtained prior to the updating step. The method may further include a step of acquiring a heat quantity ratio corresponding to the new recording linear velocity based on the combination of the sets.

  In each of the recording methods according to claim 2 and 3, as in the recording method according to claim 4, the first mark is a mark having a length indicated by 3T using a period T of a recording clock. Can be.

  In this case, as in the recording method according to claim 5, the second mark can be a mark having a length indicated by 4T.

  In each of the recording methods according to claims 1 to 5, as in the recording method according to claim 6, the optical disk can be rotated at a constant angular velocity.

  According to the seventh aspect of the invention, in order to heat the recording surface of the optical disc corresponding to the mark, the light emission power at the front part and the rear part is larger than the light emission power at the center part, and each light emission power is reproduced. A program used in an information recording apparatus for recording information on the recording surface by causing a light source to emit light in a pulse shape larger than power, and when the recording linear velocity changes, The information recording apparatus is configured to update a light emission power and a power ratio, which is a ratio of the light emission power of at least one of the front part and the rear part, and the light emission power of the central part, respectively, according to a new recording linear velocity. This program is executed by the control computer.

  According to this, when the program of the present invention is loaded into a predetermined memory and its head address is set in the program counter, the control computer of the information recording apparatus changes the mark length every time the recording linear velocity changes. Further, the ratio of the light emission time of each light emission power to the period of the recording clock is left as it is, and is the ratio of the light emission power of the central portion and the light emission power of at least one of the front and rear portions and the light emission power of the central portion The power ratio is updated according to the new recording linear velocity. That is, according to the program of the present invention, it is possible to cause the control computer of the information recording apparatus to execute the recording method according to the first aspect of the present invention, thereby preventing an increase in size and cost, It is possible to cause the information recording apparatus to perform high-speed recording with excellent recording quality on the optical disc.

  The invention according to claim 8 is a computer-readable recording medium on which the program according to claim 7 is recorded.

  According to this, since the program according to claim 7 is recorded, when the program is executed by the computer, the information recording apparatus can achieve high recording quality at a high speed without resulting in an increase in size and cost. It is possible to perform excellent recording.

  The invention according to claim 9 is an information recording apparatus for recording information on a recording surface of an optical disc, an optical pickup device including a light source; and for heating the recording surface of the optical disc corresponding to the mark. And a processing device for recording information on the recording surface by emitting light in a pulse shape in which the light emission power of the front part and the rear part is larger than the light emission power of the central part and each light emission power is larger than the reproduction power. When the recording linear velocity changes while recording the information, the light emission power of the central portion, the light emission power of at least one of the front portion and the rear portion, and the light emission of the central portion for each mark length And a control device that updates the power ratio, which is a ratio to the power, in accordance with each new recording linear velocity.

  According to this, in order to heat the recording surface of the optical disc corresponding to the mark by the processing device, the light emission power of the front part and the rear part is larger than the light emission power of the central part, and each light emission power is reproduced. The light source emits light in pulses larger than the power, and information is recorded on the recording surface of the optical disk. If the recording linear velocity changes while information is being recorded, the control device keeps the ratio of the emission time of each emission power to the period of the recording clock for each mark length, and the central emission The power and the power ratio that is the ratio of the light emission power of at least one of the front part and the rear part and the light emission power of the central part are each updated according to the new recording linear velocity. In other words, the number of setting items to be updated in response to changes in the recording linear velocity among a plurality of setting items that define the recording conditions can be greatly reduced compared to the conventional case. Thus, the recording condition can be updated to an appropriate value. Therefore, as a result, it is possible to perform recording with excellent recording quality at a high speed on an optical disc without causing an increase in size and cost.

  In this case, as in the information recording apparatus according to claim 10, the control apparatus includes the amount of heat supplied to the recording surface when the first mark having the shortest length is formed, and the first mark. The power amount ratio, which is the ratio of the heat amount supplied to the recording surface when forming a second mark longer than the second mark, matches the known heat amount ratio corresponding to the new recording linear velocity. The ratio can be updated.

  In this case, as in the information recording apparatus according to claim 11, the heat quantity ratio is acquired in advance for each of a plurality of recording linear velocities, and the control apparatus further includes the step of updating the power ratio. It is possible to acquire a heat quantity ratio corresponding to the new recording linear velocity based on a combination of a plurality of sets of the heat quantity ratio and the recording linear velocity.

  In each of the information recording apparatuses according to claims 10 and 11, as in the information recording apparatus according to claim 12, the first mark has a length indicated by 3T using a period T of a recording clock. It can be a mark.

  In this case, as in the information recording apparatus according to the thirteenth aspect, the second mark can be a mark having a length indicated by 4T.

  In each of the information recording devices according to the ninth to thirteenth aspects, as in the information recording device according to the fourteenth aspect, the optical disk can be rotated at a constant angular velocity.

  Hereinafter, an embodiment of the present invention will be described with reference to FIGS. FIG. 1 shows a schematic configuration of an optical disc apparatus 20 as an information recording apparatus according to an embodiment of the present invention.

  An optical disk device 20 shown in FIG. 1 includes a spindle motor 22 for rotating the optical disk 15, an optical pickup device 23, a seek motor 21 for driving the optical pickup device 23 in the sledge direction, a laser control circuit 24, An encoder 25, a drive control circuit 26, a reproduction signal processing circuit 28, a buffer RAM 34, a buffer manager 37, an interface 38, a flash memory 39, a CPU 40, a RAM 41, and the like are provided. Note that the arrows in FIG. 1 indicate the flow of typical signals and information, and do not represent the entire connection relationship of each block. In the present embodiment, as an example, an information recording medium that conforms to the DVD + R standard is used for the optical disc 15.

  The optical pickup device 23 is a device for condensing laser light on the recording surface of the optical disc 15 and receiving reflected light from the recording surface. The optical pickup device 23 includes a semiconductor laser that emits laser light having a wavelength of about 660 nm, an objective lens that condenses the light beam emitted from the semiconductor laser on the recording surface of the optical disk 15, and a return light beam that is reflected by the recording surface. And a drive system (focusing actuator and tracking actuator) (both not shown) for driving the objective lens. The light receiver has a plurality of light receiving elements (or light receiving areas), and outputs a signal (photoelectric conversion signal) corresponding to the amount of light received by each light receiving element (or light receiving area) to the reproduction signal processing circuit 28.

  Based on the output signal (a plurality of photoelectric conversion signals) of the photoreceiver, the reproduction signal processing circuit 28 performs servo signals (focus error signal, track error signal, etc.), address information, synchronization signal, And an RF signal and the like are acquired. The servo signal obtained here is output to the drive control circuit 26 and the CPU 40, the address information is output to the CPU 40, and the synchronization signal is output to the encoder 25, the drive control circuit 26, and the like. The reproduction signal processing circuit 28 performs decoding processing, error detection processing, and the like on the RF signal. When an error is detected, the reproduction signal processing circuit 28 performs error correction processing, and then plays back the buffer via the buffer manager 37 as reproduction data. Store in the RAM 34.

  The drive control circuit 26 generates a drive signal for the tracking actuator for correcting the displacement of the objective lens in the tracking direction based on the track error signal from the reproduction signal processing circuit 28. Further, the drive control circuit 26 generates a driving signal for the focusing actuator for correcting the focus shift of the objective lens based on the focus error signal from the reproduction signal processing circuit 28. Each drive signal generated here is output to the optical pickup device 23. Thereby, tracking control and focus control are performed. Furthermore, the drive control circuit 26 generates a drive signal for driving the seek motor 21 and a drive signal for driving the spindle motor 22 based on an instruction from the CPU 40. Each drive signal is output to the seek motor 21 and the spindle motor 22, respectively.

  The buffer RAM 34 temporarily stores data to be recorded on the optical disc 15 (recording data), data reproduced from the optical disc 15 (reproduction data), and the like. Data input / output to / from the buffer RAM 34 is managed by the buffer manager 37.

  The encoder 25 takes out the recording data stored in the buffer RAM 34 through the buffer manager 37 based on an instruction from the CPU 40, modulates the data, adds an error correction code, and the like, and writes a signal to the optical disc 15. Is generated. The write signal generated here is output to the laser control circuit 24.

  The laser control circuit 24 controls the light emission power of the semiconductor laser. For example, during recording, a laser control circuit 24 generates a semiconductor laser drive signal based on the write signal, recording conditions, semiconductor laser emission characteristics, and the like.

  The interface 38 is a bidirectional communication interface with a host device 90 (for example, a personal computer), and is a standard interface such as ATAPI (AT Attachment Packet Interface), SCSI (Small Computer System Interface), and USB (Universal Serial Bus). It is compliant.

  The flash memory 39 stores various programs including a program according to the present invention described in a code decodable by the CPU 40, various data such as recording conditions including recording power and recording strategy information, and light emission characteristics of the semiconductor laser. Has been.

  The CPU 40 controls the operation of each unit in accordance with the program stored in the flash memory 39 and stores data necessary for control in the RAM 41 and the buffer RAM 34.

  Here, the recording strategy will be described. In this embodiment, as shown in FIG. 2 as an example, the length of the mark to be formed (hereinafter abbreviated as “target mark”) is 4T (T is the period of the channel clock (recording clock)) or more. In this case, a heating pulse for heating the recording surface of the optical disc 15 corresponding to one mark is applied to a part of the normal recording power (Pp) pulse (here, the front end portion and the rear end portion). A so-called castle strategy is adopted in which a predetermined power is superimposed. A cooling pulse (CP) is added after the heating pulse.

  Here, the front end portion of the heating pulse is referred to as a front end pulse FP, the central portion is referred to as a central pulse MP, and the rear end portion is referred to as a rear end pulse EP. The emission power of the front end pulse FP is Pp + dPp, the pulse width is Ttop, the emission power of the center pulse MP is Pp, the pulse width is Tmp, the emission power of the rear end pulse EP is Pp + dPp, and the pulse width is Tlp. The light emission power of the cooling pulse CP (hereinafter also referred to as “cooling power”) is Pc, and the pulse width is Tc. Pp> reproduction power (referred to as Pr)> Pc. That is, in order to heat the recording surface of the optical disc 15 corresponding to one mark, the light emission power at the front and rear portions thereof is larger than the light emission power at the central portion, and each light emission power is larger than the reproduction power. Laser light is emitted from the light source in a pulse form. Each pulse width varies depending on the length of the target mark.

  On the other hand, the heating pulse when the length of the target mark is 3T is a rectangular pulse (SP) having a light emission power of Pp + dPp. The pulse width of this pulse SP is Tl3. Also in this case, a cooling pulse CP is added after the heating pulse. This pulse SP can also be regarded as a case where the pulse width Tmp of the central pulse MP is zero.

  Each pulse width is indicated by the ratio of the light emission time to the period T of the channel clock.

  The light emission power (hereinafter also referred to as “bottom power”) Pb when forming a space is substantially the same as the reproduction power Pr.

  Incidentally, when the length of the space immediately before the target mark is 3T, the temperature of the recording surface at the start of the formation of the target mark is not sufficiently lowered. Therefore, in this embodiment, an example is shown in FIG. In this manner, the rising timings of the tip pulse FP and the pulse SP are delayed by a predetermined time (dTle). That is, in this case, the pulse width of the tip pulse FP is Ttop-dTle, and the pulse width of the pulse SP is Tl3-dTle.

  In this embodiment, when the recording linear velocity changes, each pulse width indicated by the ratio of the light emission time to the period T of the channel clock is left as it is, and the light emission power Pp of the center pulse MP and the ratio of dPp and Pp (φ = dPp / Pp) is changed according to the new recording linear velocity. In the conventional castle strategy, as shown in FIG. 4 as an example, the ratio φ is generally constant regardless of the recording linear velocity (φ = 0.5 as an example in FIG. 4). . In this case, when the recording strategy is set so that a good recording quality can be obtained when the recording linear velocity is 2.4 × speed, as shown in FIG. 5 as an example, jitter increases as the recording linear velocity increases. When the recording linear velocity exceeds 4 ×, the jitter exceeds 9%, which is the upper limit value for obtaining good recording quality.

  As a part of the recording conditions, an approximate expression showing the relationship between Pp and recording linear velocity, bottom power Pb, cooling power Pc, pulse width Tl3, pulse width Tc, delay time dTle, and mark length Pulse widths Ttop, Tmp, and Tlp are stored in the flash memory 39.

  In addition, when a mark having a length of 3T (first mark) is formed at a recording linear velocity of 2.4 times speed, the amount of heat supplied to the recording surface and a mark having a length of 4T (second mark) are A ratio with the amount of heat supplied to the recording surface when forming (the heat amount ratio θ2) is calculated in advance. Specifically, as shown in FIG. 6 as an example, the area of the heating pulse S1 and the length of 4T when a mark of 3T length is normally formed at a recording linear velocity of 2.4 times speed. A ratio (S1 / S2) to the area S2 of the heating pulse when the mark is normally formed is calculated, and the heat quantity ratio θ2 when the recording linear velocity is 2.4 times speed is calculated. Similarly, the heat quantity ratio (heat quantity ratio θ12) at the 12-times recording linear velocity is also calculated in advance. In this case, the length of the space immediately before each mark is 4T or more. As an example, as shown in FIG. 7, an approximate expression indicating the relationship between the heat ratio and the recording linear velocity is calculated based on the heat ratio θ2 and the heat ratio θ12, and flash memory is used as part of the recording conditions. 39.

<Recording process>
Here, a process (recording process) when the optical disk apparatus 20 configured as described above receives a recording request command for recording user data on the optical disk 15 from the host apparatus 90 by the CAV method with reference to FIG. explain. The flowchart in FIG. 8 corresponds to a series of processing algorithms executed by the CPU 40. When the recording request command is received from the host device 90, the head address of the program corresponding to the flowchart of FIG. 8 (hereinafter referred to as “recording processing program”) stored in the program area of the flash memory 39 is set in the program counter of the CPU 40. Then, the recording process starts.

  In the first step 401, OPC processing is performed. In other words, predetermined data was trial-written in a test writing area called PCA (Power Calibration Area) provided on the optical disk 15 while changing the recording power stepwise at a predetermined recording linear velocity (V0). After that, the data is sequentially reproduced, and when the asymmetry value detected from the RF signal substantially matches the target value obtained in advance through experiments or the like, it is determined that the recording quality is the highest. The recording power is optimum at the recording linear velocity V0.

  In the next step 403, based on the result of the OPC process, an approximate expression indicating the relationship between the Pp stored in the flash memory 39 and the recording linear velocity is corrected.

  In the next step 405, a recording linear velocity (V1) for recording user data in an area indicated by an address designated by the recording request command (hereinafter also referred to as “designated address”) is acquired. This recording linear velocity is calculated from the rotational speed of the optical disc 15 and the linear distance from the rotational center of the optical disc 15 to the designated address.

  In the next step 407, an approximate expression showing the relationship between Pp and the recording linear velocity is referred to obtain an appropriate Pp for the recording linear velocity V1, and set the Pp in the laser control circuit 24.

  In the next step 409, the heat quantity ratio (referred to as θn) corresponding to the recording linear velocity V1 is obtained with reference to an approximate expression showing the relationship between the heat quantity ratio and the recording linear velocity.

  In the next step 411, φ is calculated by substituting known values in the following equation (1).

  θn = TI3 × Pp (1 + φ) / {(Ttop + Tlp) × Pp (1 + φ) + (Tmp × Pp)} (1)

  In the next step 413, dPp appropriate for the recording linear velocity V1 is acquired based on φ, and the dPp is set in the laser control circuit 24.

  In the next step 415, the drive control circuit 26 is instructed to form a light spot in the vicinity of the target position corresponding to the address specified by the recording request command. Thereby, a seek operation is performed. If the seek operation is unnecessary, the process here is skipped.

  In the next step 417, recording is permitted. Thereby, recording on the optical disk 15 is started via the encoder 25, the laser control circuit 24, and the optical pickup device 23.

  In the next step 419, it is determined whether or not the recording is completed. If not completed, the determination here is denied, and the routine proceeds to step 421.

  In this step 421, the current recording linear velocity is acquired.

  In the next step 423, an approximate expression indicating the relationship between Pp and the recording linear velocity is referred to obtain an appropriate Pp for the current recording linear velocity and set the Pp in the laser control circuit 24. That is, Pp is updated while continuing the recording operation.

  In the next step 425, the heat quantity ratio corresponding to the current recording linear velocity is obtained by referring to an approximate expression showing the relationship between the heat amount ratio and the recording linear velocity.

  In the next step 427, φ is calculated by substituting known values into the above equation (1).

  In the next step 429, dPp appropriate for the current recording linear velocity is acquired, and the dPp is set in the laser control circuit 24. That is, dPp is updated while continuing the recording operation. Then, the process returns to step 419.

  If the recording is completed in step 419, the determination here is affirmed and the recording process is terminated.

  As is clear from the above description, in the optical disc device 20 according to the present embodiment, the processing device is configured by the laser control circuit 24. The control device is realized by the CPU 40 and a program executed by the CPU 40. That is, the control device is realized by steps 421 to 429 in FIG. Note that at least a part of the control device realized by processing according to the program by the CPU 40 may be configured by hardware, or all may be configured by hardware.

  In the present embodiment, the program according to the present invention is executed by the recording processing program among the programs recorded in the flash memory 39 as a recording medium. That is, the update procedure is executed by a program corresponding to the processing of steps 421 to 429 in FIG.

  Then, the update process in the recording method according to the present invention is performed by the processing of steps 421 to 429 in FIG. Note that the obtaining step is performed in the process of manufacturing the optical disc device 20.

  As described above, according to the optical disc apparatus 20 according to the present embodiment, when a recording request command is received from the higher-level apparatus 90, Pp appropriate for the recording linear velocity V1 when recording user data in the area indicated by the designated address After dPp is set, recording is started. When the recording linear velocity changes, the ratio of each pulse width (light emission time of light emission power) to the period T of the channel clock is kept as it is for each mark length, and Pp (light emission power at the center) and φ (Power ratio) is updated according to the new recording linear velocity. This makes it possible to significantly reduce the number of setting items to be updated according to changes in the recording linear velocity among a plurality of setting items that define recording conditions. Thus, the recording condition can be updated to an appropriate value. Therefore, as a result, it is possible to perform recording with excellent recording quality at a high speed without increasing the size and cost of the optical disk device.

  In the above embodiment, the case where the approximate expression indicating the relationship between the heat quantity ratio and the recording linear velocity is a linear expression has been described. However, the present invention is not limited to this, and for example, the heat quantity ratio when the recording linear velocity is quadruple speed ( The heat quantity ratio θ4) and the heat quantity ratio when the recording linear velocity is 8 times speed (heat quantity ratio θ8) are calculated. As an example, as shown in FIG. 9, the approximate expression may be a quadratic expression. .

  In the above embodiment, the heating pulse when the length of the target mark is 4T or more is three light emission powers (light emission power of the front end pulse FP, light emission power of the central pulse MP, and light emission power of the rear end pulse EP). Although the case where it is prescribed | regulated was demonstrated, this invention is not limited to this. For example, as shown in FIGS. 10A and 10B, a heating pulse when the length of the target mark is 4T or more may be defined by four light emission powers.

  In the above embodiment, the case where the light emission power of the front end pulse FP is equal to the light emission power of the rear end pulse EP has been described. However, the present invention is not limited to this, and the light emission power of the front end pulse FP and the rear end pulse EP. The light emission power may be different. In this case, assuming that the light emission power of the front end pulse FP is Pp + dPp1, and the light emission power of the rear end pulse EP is Pp + dPp2, when the recording linear velocity changes, the pulse width with respect to the cycle T of the channel clock is left as it is. Along with the emission power Pp of the pulse MP, at least one of the ratio of dPp1 and Pp and the ratio of dPp2 and Pp is changed according to the new recording linear velocity.

  In the above-described embodiment, the case where user data is recorded on the optical disk 15 by the CAV method has been described. May be. In short, any method that changes the recording linear velocity during recording may be used.

  In the above embodiment, the case where the second mark is a mark having a length of 4T has been described. However, the present invention is not limited to this, and the mark may be longer than 4T. In short, it is sufficient that the second mark is longer than the first mark.

  In the above embodiment, the case where the first mark is a mark having a length of 3T has been described. However, when 3T is not the shortest mark, the shortest mark is the first mark.

  In the above embodiment, the program according to the present invention is recorded in the flash memory 39, but is stored in another recording medium (CD, magneto-optical disk, DVD, memory card, hard disk, USB memory, flexible disk, etc.). It may be recorded. In this case, the program according to the present invention is loaded into the flash memory 39 via the playback device (or dedicated interface) corresponding to each recording medium. Further, the program according to the present invention may be transferred to the flash memory 39 via a network (LAN, intranet, Internet, etc.). In short, it is sufficient that the program according to the present invention is stored in the flash memory 39.

  In the above embodiment, the case where the optical disk 15 is an optical disk conforming to the DVD + R standard has been described. However, the present invention is not limited to this, and may be a rewritable DVD. Further, it may be a next-generation information recording medium corresponding to light having a wavelength of about 405 nm. In short, any information recording medium capable of recording information using light may be used.

  Moreover, although the said embodiment demonstrated the case where the optical disk 15 had one recording layer, it may have not only this but a several recording layer. In this case, a recording layer conforming to the CD standard and a recording layer conforming to the DVD standard may be mixed.

  In the above embodiment, the case where the optical pickup device includes one semiconductor laser has been described. However, the present invention is not limited thereto, and for example, a plurality of semiconductor lasers that emit light beams having different wavelengths may be included. In this case, for example, at least one of a semiconductor laser that emits a light beam with a wavelength of about 405 nm, a semiconductor laser that emits a light beam with a wavelength of about 660 nm, and a semiconductor laser that emits a light beam with a wavelength of about 780 nm may be included. . That is, the optical disk apparatus may be an optical disk apparatus that supports a plurality of types of optical disks that conform to different standards.

  Moreover, although the said embodiment demonstrated the case where an optical disk apparatus was used as an information recording device, it is not restricted to this, For example, you may use a DVD recorder. In short, any device capable of recording information using light may be used.

  As described above, the recording method of the present invention is suitable for performing high-speed recording with excellent recording quality on an optical disc without increasing the size and cost of the information recording apparatus. . Further, the information recording apparatus of the present invention is suitable for performing high-speed recording with excellent recording quality on an optical disc without causing an increase in size and cost. Further, the program and the storage medium of the present invention are suitable for causing an information recording apparatus to perform high-speed recording with excellent recording quality on an optical disc without increasing the size and cost. .

It is a block diagram which shows the structure of the optical disk apparatus as an information recording device concerning one Embodiment of this invention. It is a figure for demonstrating the pulse shape (no delay) of the light emission power at the time of forming a mark. It is a figure for demonstrating the pulse shape (with delay) of the light emission power at the time of forming a mark. It is a figure for demonstrating the difference with the conventional castle strategy. It is a figure for demonstrating the jitter in FIG. It is a figure for demonstrating heat quantity ratio. It is a figure for demonstrating the approximate expression which shows the relationship between heat quantity ratio and a recording linear velocity. It is a flowchart for demonstrating a recording process. It is a figure for demonstrating the modification of the approximate type | formula which shows the relationship between heat quantity ratio and a recording linear velocity. FIG. FIG. 10A and FIG. 10B are diagrams for explaining modifications of the pulse shape of the light emission power when forming marks.

Explanation of symbols

DESCRIPTION OF SYMBOLS 15 ... Optical disk, 20 ... Optical disk apparatus (information recording device), 23 ... Optical pick-up apparatus, 24 ... Laser control circuit (processing apparatus), 39 ... Flash memory (recording medium), 40 ... CPU (control apparatus).

Claims (14)

In order to heat the recording surface of the optical disc corresponding to the mark, the light source is pulsed in such a way that the light emission power at the front and rear portions is larger than the light emission power at the center and each light emission power is larger than the reproduction power. A recording method for recording information on the recording surface by emitting light,
When the recording linear velocity changes, for each mark length, the light emission power of the central portion, and the power ratio that is the ratio of the light emission power of at least one of the front and rear portions and the light emission power of the central portion, And a recording method including a step of updating each according to a new recording linear velocity.   In the updating step, the amount of heat supplied to the recording surface when the first mark having the shortest length is formed, and the recording surface when forming the second mark longer than the first mark. The power ratio is updated so that a heat quantity ratio, which is a ratio to a heat quantity supplied to the recording medium, matches a known heat quantity ratio according to the new recording linear velocity. Recording method. The heat ratio is acquired in advance for each of a plurality of recording linear velocities,
3. The method according to claim 2, further comprising: prior to the updating step, obtaining a heat amount ratio corresponding to the new recording linear velocity based on a combination of a plurality of sets of the heat amount ratio and the recording linear velocity. The recording method described in 1.   4. The recording method according to claim 2, wherein the first mark is a mark having a length indicated by 3T using a period T of a recording clock.   The recording method according to claim 4, wherein the second mark is a mark having a length indicated by 4T.   The recording method according to claim 1, wherein the optical disk rotates at a constant angular velocity. In order to heat the recording surface of the optical disc corresponding to the mark, the light source is pulsed in such a way that the light emission power at the front and rear portions is larger than the light emission power at the center and each light emission power is larger than the reproduction power. A program for use in an information recording device that emits light and records information on the recording surface,
When the recording linear velocity changes, for each mark length, the light emission power of the central portion, and the power ratio that is the ratio of the light emission power of at least one of the front and rear portions and the light emission power of the central portion, A program for causing the control computer of the information recording apparatus to execute a procedure for updating according to each new recording linear velocity.   A computer-readable recording medium on which the program according to claim 7 is recorded. An information recording apparatus for recording information on a recording surface of an optical disc,
An optical pickup device including a light source;
In order to heat the recording surface of the optical disc corresponding to the mark, the light source has a pulse in which the light emission power at the front part and the rear part is larger than the light emission power at the center part and each light emission power is larger than the reproduction power. A processing device that emits light in a shape and records information on the recording surface;
When the recording linear velocity changes during recording of the information, the light emission power of the central part, the light emission power of at least one of the front part and the rear part, and the light emission power of the central part for each mark length. And a control device that updates a power ratio, which is a ratio of the two, in accordance with a new recording linear velocity.   The controller controls the amount of heat supplied to the recording surface when forming the first mark having the shortest length and the recording surface when forming a second mark longer than the first mark. 10. The information according to claim 9, wherein the power ratio is updated so that a heat quantity ratio that is a ratio with a supplied heat quantity matches a known heat quantity ratio according to the new recording linear velocity. Recording device. The heat ratio is acquired in advance for each of a plurality of recording linear velocities,
Prior to updating the power ratio, the control device further acquires a heat quantity ratio corresponding to the new recording linear velocity based on a combination of a plurality of sets of the heat quantity ratio and the recording linear velocity. The information recording apparatus according to claim 10.   12. The information recording apparatus according to claim 10, wherein the first mark is a mark having a length indicated by 3T using a period T of a recording clock.   13. The information recording apparatus according to claim 12, wherein the second mark is a mark having a length indicated by 4T. The information recording apparatus according to claim 9, wherein the optical disk rotates at a constant angular velocity.

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