TW200823890A - A system and method of minimizing the power dissipation during recording data on an optical disc - Google Patents

Abstract

The invention relates to a system and method of operating a data recording device (DRD) comprising a reading/writing head (OH) for reading/writing data on a data record carrier (OM), and a turntable motor (TM) for rotating said data record carrier (OM), said method comprising a step of generating a control signal (STM) for varying the rotating frequency (f) of said turntable motor (TM) according to a frequency profile defining the rotating frequency as a function of a position (R) of the reading/writing head (OH) on the data record carrier (OM), said frequency profile comprising a first portion (CLV) during which the rotating frequency is decreased from a starting frequency to an intermediate frequency, said first portion (CLV) being followed by a second portion (VLV) during which the rotating frequency is increased from said intermediate frequency to a final frequency.

Description

200823890 IX. Description of the Invention: [Technical Field] The present invention relates to a method of operating a data recording apparatus and a data recording apparatus embodying the same. One particular application of the present invention relates to an optical data recording apparatus that uses a laser to read and write data on a compact disc. [Prior Art] The relative velocity V of a data point on a rotating optical disk relative to the optical head can be expressed as ν = Γ.ω, where r is the distance between the data point and the center of the optical disk (ie, the radius), and The rotational speed of the shaft motor of the ω-system rotating optical disc. three

One of the variables V, Γ, ω must be strange. The & radius [changes with the position of the material point, so it can only be constant. Therefore, the spindle motor can generally rotate the disc according to the - (four) degree mode or the - value fixed angle mode. If the servo system that controls the position of the optical head keeps the relative speed V constant, the rotation mode of the spindle motor is said to be a constant linear velocity. The advantage of this mode is to maintain a lean feed rate of $, and the phase-locked loop can only maintain a correct data readout by locking a fixed frequency. The rotational speed of the spindle motor has to be changed relative to the position of the optical head. . If the rotation speed is kept increasing to some extent, it is considered that the spindle motor can reach a predetermined high speed when the optical head is in the (10) lane. When the right servo system keeps the speed 1 constant ^, the rotation mode is called the strange fixed angle speed. In this mode, it is easier to control the rotary shaft motor because the rotary shaft motor rotates at a fixed angular velocity. Μ The fixed angular velocity is exactly different from the ^ linear velocity. 116494.doc 200823890 However, the data transfer rate in the outer track is higher than the data transfer rate in the inner track. Therefore, the phase-locked loop must follow the data readout in the constant angular velocity mode to modify the fundamental frequency that should be locked. Optical drive systems (eg, for CD-ROMs) are typically calibrated to achieve a maximum system margin (ie, processing such as offset interference without read/write errors), a maximum data transfer rate, or A quick access time. The constant angular velocity mode or the constant linear velocity mode results in an increase in power/dissipation of the optical drive system and thus an increase in power consumption in the optical drive system. SUMMARY OF THE INVENTION One object of the present invention is to provide a method of operating a data recording apparatus that overcomes at least one of the disadvantages of the prior art. In detail, the method enables power consumption in a data recording apparatus. minimize. To this end, a method of operating a data recording device (DRD) is proposed, which is used on a data record carrier (OM) and a device for rotating the data record device (DRD) for inclusion in a data fetch/write Read/write head (OH) of data, turntable motor (TM) of record carrier (OM).

Increase to a final frequency. 116494.doc 200823890 Depending on the situation 'rotation frequency can _' can be along the second part of the two body:: two:: frequency corresponds to the read / write head in the data record carrier I Lee 'read / write head The determined position is adjustable. The area of the write head can correspond to the outer side of the data record carrier: another L-like 'this invention relates to the electric moon self-program product for the data recording device The computer automatically produces a set of instructions, and when the group is ordered to be loaded into the data recording device, the method according to the present invention is applied. Only the county is executed to execute the root A. The invention relates to a data recording device for reading/writing a read/write data of a material on a poor record carrier. The data record carrier can be inserted into the data recording device; The data recording carrier's turntable motor; and an electronic configuration that engages the turntable motor. The electronic configuration operates the turntable motor in accordance with the steps of the method according to the present invention. π advantageously 'rotation frequency can be reduced from the starting frequency To the intermediate frequency, one of the electronic configurations is known The heart current is constant. The adaptive frequency curve of the present invention enables control of the reduction in power consumption in the drive module of the turntable motor. Due to the reduction in the electronically configured clock frequency coupled to the adaptive frequency curve of the present invention Small and core current reduction, the present invention further enables control of power consumption in the drive module of other components of the data recording device (eg, tracking motor, read/write head assembly, etc.) 116494.doc 200823890 reduction These and other aspects of the present invention will be apparent from the embodiments described hereinafter and will be described with reference to the embodiments described below. FIG. 1 is a schematic and partial illustration of a The block data recording device DRD of the recording device DRD performs an operation of capturing and writing information on a data record carrier OM. The data recording device includes a read/

The write head OH, a turntable motor TM (also known as a spindle motor), a tracking motor SM, and an electronic configuration ea. A data record carrier OM is shown inserted in the recording device. The data record carrier OM can be a compact disc. The surface of the disc may comprise a single spiral that spirals from the interior of the disc to the exterior of the disc. The binary information recorded on the track is represented by the photodetectable portion (i.e., the mark and the interval). Due to the different optical properties of the marks and spaces (e.g., changes in the reflection of the laser beam), the marks and spaces are detectable. The read/write head OH contains a radiation source (e.g., a laser diode) for generating a radiation beam (e.g., a laser beam). By controlling the power of the laser beam, it is possible to read or write information on the data record carrier 0M. The read/write head OH also includes various optical components for directing and focusing the laser beam onto the track of the data record carrier OM. The read/write head 〇H further includes a detector (eg, a four-quadrant diode) for detecting and measuring a laser beam reflected by the optically detectable portion of the track of the data record carrier. The turntable motor TM is rotated according to an angular velocity w proportional to a rotational frequency. The transmission of the data is recorded by the carrier 〇]V[. The rotational frequency determines the read/write mode and speed associated with the data recording device DRD. The seek motor SM controls the radius r, that is, the position of the read/write head 〇H relative to the way. The position R represents the focus point of the laser beam emitted from the central axis of the data record carrier 〇M and the track toward the data transcript carrier? The distance between 8. The data record carrier DRD may further comprise a loading unit (not shown) for inserting or removing the data record carrier. The electronic configuration EA includes a processing module pR〇 and a driving module DRV. The processing group PRO may include a data encoding module, a control module and a laser power control module that are commonly connected via a bus bar (the components are omitted in the figure for clarity reasons). The data encoding module function encodes and decodes data according to a predefined recording format. The data encoding module provides signals for writing marks on the optical record carrier OM and also provides timing signals. The processing module PRO can receive commands from a consumer electronic device (audio device, video device, computer, television, etc.). The laser power control module provides a laser power control signal to the read/write head 〇 H to set the read/write power of the laser source. Typically, a laser power control module operates in response to three input signals to control laser power. Known input signals are delta signals, threshold signals, and alpha signals. Processing The PRO group PRO can also be connected to an interface module (not shown). The interface module allows the data recording device DRD to be connected to other electronic circuits, which are typically included in consumer electronic devices. The operation of the processing module requires a clock frequency elk and a core current ic. 116494.doc •10- 200823890 The drive module DRV is coupled to the processing module pro. The drive module DRV controls the turntable motor TM and the tracking motor SM of the data recording device DRD, and the components of the read/write head OH. More precisely, the drive module DRV provides a first motor signal STM to the turntable motor TM for controlling the rotational frequency of the optical disc OM. The drive module DRV provides a second motor signal SSM to the tracking motor SM for controlling the position of the read/write head 〇H and thus the scanning of the track of the optical disc OM. The drive module drV provides a plurality of read/write heads SS0H to read/write heads 以H for controlling the focus, collimation and tilt parameters of the read/write head 〇H. Figure 2 illustrates two frequency curves CAV and (CLV, VLV) corresponding to the rotational frequency of the turntable motor tm as a function of the position of the read/write head on the data record carrier. The rotational frequency is proportional to the angular velocity 转 of the rotary motor. These frequency curves are used for read and write operations. A first frequency curve CAV corresponds to a typical mode of operation (dashed line) according to one of the prior art. A first frequency curve corresponds to an operational mode (solid line) according to the present invention, i.e., a combination of a constant linear velocity portion CLV and a variable linear velocity portion VLV. The first frequency curve CAV is associated with a carousel motor that operates according to a constant angular velocity. For example, the constant angular velocity corresponds to a rotational frequency of 155 Hz2. The first frequency curve CAV evolves from a starting data transfer rate SSx to a final data transfer rate SFx. The initial data transfer rate SSx may correspond to - the defensive six time rate 1 and the final data transfer rate SFx may correspond to _;: 116494.doc 11 200823890 The sixteenth time speed. The data transfer rate is a function of the radius R. The data transfer rate SSx linearly increases to the final data transfer rate SFx. The initial data transfer rate SSx is associated with a read/write head positioned at a radius R (e.g., a radius R of about 0.022 m) corresponding to an inner region of the optical disk 〇M. The final data transfer rate SFx is associated with a read/write head located at a radius R (e.g., a radius of about 58 m) corresponding to an outer region of one of the optical discs M.

The second frequency curves CLV, VLV correspond to a turntable motor that operates like a gamma knife. The second frequency curve includes a first portion CLv and a first portion VLV. Along the first part, the data transfer rate evolves from an initial data transfer rate SSx to an intermediate data transfer rate scp, while the rotation frequency is small. The rotational frequency generally decreases linearly along the first portion. Alternatively, other types of reduction curves may be used, such as log reduction ^start data transfer ^ may correspond to - normalized six time velocity, and the initial rotational frequency gate may be about 155 Hz. The intermediate data transfer rate SCP is lower than the initial data transfer rate and the intermediate rotation frequency f2 can be about 75 Hz. The data transfer rate as a semi-T-function is reduced from the initial data transfer rate ssx to the intermediate data transfer rate to the most: the two parts of the 'data transfer rate from the intermediate data transfer rate evolution eight I $ rate' while the rotation frequency f increases Big. The rotation frequency increases along the large === heart rate. Alternatively, other types of standardization may be added. The final transmission rate SFX may correspond to - thus Μ Γ and the final rotation frequency may be about ... Hz. The transfer rate is increased from the intermediate f-feed rate to the final data. Partial VLV, laser source power and other writes 116494.doc -12- 200823890 Policy parameters can be changed as a function of data transfer rate. From the frequency profile in accordance with the present invention, the hatched area psi between the first frequency curve and the second frequency curve is proportional to the reduction in power consumption in the drive module.

Figure 4 illustrates an alternative to the frequency curve shown in Figure 2. The position of the read/write head can be adjusted to different positions. Each position corresponds to a specific intermediate data transfer rate/rotation frequency pair. The specific intermediate data transfer rate/rotation frequency pair defines - a determination between the odd linear velocity portion CLV and the variable linear velocity portion VLV of the frequency curve according to the present invention. Figure 4 shows four examples of frequency curves, which respectively include a first scivf2i intermediate data transfer rate/rotation frequency pair, a second SCI&gt;2/f22 intermediate data transfer rate/rotation: rate pair, and a third (10) center. Data transfer rate/rotation frequency pair and a fourth SCPn/f2n intermediate data transfer rate/rotation frequency pair. Determining that the transition point can be adjusted as a "number of different parameters of the data recording device DRD (eg, as a function of 'laser temperature), or defining a flux rate = data record carrier write speed) and power consumption Accepting the compromise. ~ Determining the transition point can be adjusted by the processing module and can be adapted to the particular consumer electronics "application" to which the data recording device is coupled (eg, via calibration). As a --instance, if the power consumption is an important aspect (for example, a laptop application) and the write duration of the total data record carrier is more important, the frequency curve will be adjusted to minimize power consumption. . In this case, the transition point will correspond to the data transfer rate/rotational condition of the raSCPn/f2nt ^ 疋 116 116494.doc -13- 200823890 as a second example, if the power consumption and the total data record carrier are written A compromise is required between incoming durations (eg, a desktop application), and the frequency curve is adjusted such that the transition point can correspond to the first SCPJfZi intermediate data transfer rate and the rotational frequency pair. Figure 3 shows two current curves that illustrate one of the core configurations Ic of the electronic configuration E A as a function of the position of the read/write head on the data record carrier. The first current curves CAVC1, CAVC2 correspond to a typical mode of operation (dashed line) according to one of the prior art. The second current curves CLVC, VLVC correspond to an operational mode (solid line) according to the invention. The first current curves CAVC1, CAVC2 are associated with the first frequency curve CAV shown in Figure 2. The first current curve includes a first current curve portion CAVC1 and a second current curve portion CAVC2. The first current curve portion CAVC1 is associated with a read/write operation at an inner region of the optical disc OM. In this area, the data transfer rate is low, resulting in a low processing module clock frequency and a low core current. For example, an internal region (i.e., a radius R between 0.022 m and 0.034 m) may have a core current I c of about 200 in A. The second current curve portion CAVC2 is associated with a read/write operation outside the internal area of the optical disc OM. Outside the internal area, there is a sudden change in the data transfer rate, resulting in a larger processing module clock frequency and a larger core current. For example, for a region between 0.034 m and 0.058 m, the core current Ic can be suddenly changed to 260 mA and slightly increased to 270 mA. The second current curve CLVC, VLVC is shown in Figure 2. The second frequency 116494.doc -14- 200823890 is related to the curves CLV, VLV. The second current curve includes a first current curve portion CLVC and a second current curve portion VLVC. The first current curve portion CLVC is associated with a decrease in the rotational frequency f (see Figure 2) and a decrease in the data transfer rate. Thus, the data transfer rate is low, resulting in a low processing module clock frequency. This makes it possible to maintain the core current as low and i*疋, for the position of the read/write head between the radius φ of one of 〇〇22 m and the radius R of one of 〇〇5〇(f) The core current ^ can be about 200 mA. The second current curve portion VLVC is associated with a buy/write operation at an outer area of one of the optical discs M. At the external zone, the data transfer rate and the rotational frequency of the turntable motor are present—changed (see Figure 2), resulting in a larger processing module clock frequency and a larger core current. For example, for an external region between 0.050 m and G.G58 m, the core current ^ can be increased from 200 mA to 270 mA. From the frequency profile according to the invention, it is known that the hatched area PS2 between the first current curve and the second electric grab curve is proportional to the reduction in power consumption in the drive module. Although the above description has focused on the method of the present invention for a feed-to-use-laser, optical data recording device, it will be apparent to those skilled in the art that the present invention can also be used in magnetic hard disk drive applications. The drawings and their description above are not limiting of the invention. Any reference signs in the "French Patent" section should not be construed as limiting the application of the patents. & </ RTI> </ RTI> </ RTI> </ RTI> </ RTI> </ RTI> </ RTI> </ RTI> does not exclude the existence of TL parts other than those listed in the scope of the patent application. - The words preceding the elements do not exclude the plural 116494.doc -15- 200823890 The existence of such components. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram of a data recording apparatus including an electronic configuration for performing the method according to the present invention; a FIG. 2 illustrates that the rotation frequency is indicated as reading/writing π. Two frequency curves of one of the functions of the position on the carrier; Figure 3 shows two curves illustrating one of the core configurations of the electronic configuration as a function of the position of the read/write head on the data record carrier;

Figure 4 shows an alternative to the frequency curve which indicates the rotational frequency as a function of the position of the read/write head on the data record carrier. [Main component symbol description] Angular velocity ΑΧ Central axis CAVC1 First current curve / First current curve portion CAVC2 First current curve / Second current curve portion CAV First frequency curve elk Clock frequency CLVC Second current curve / First current curve Partial CLV constant linear speed section / first part DRD data recording device DRV drive module EA electronic configuration fl initial rotation frequency f2 intermediate rotation frequency 116494.doc -16- 200823890

F3 Final rotation frequency FS Focus point f Rotation frequency Ic Core current OH Read/write head OM Data record carrier PRO Processing module PS1 Hatched area PS2 Hatched area R position/radius SCP1/f21 First intermediate data transfer rate / Rotation frequency pair SCP2/f22 Second intermediate data transmission rate/rotation frequency pair SCP3/f23 Third intermediate data transmission rate/rotation frequency pair SCPn/f2n Fourth intermediate data transmission rate/rotation frequency pair SCP Intermediate data transmission rate SFx Final data Transfer rate SM seek motor S〇H Read/write head signal SsM Second motor signal SSx Start data transfer rate Stm First motor signal TM Turntable motor VLVC Second current curve / Second current curve part VLV Variable line Speed section / second part 116494.doc -17-

Claims (1)

200823890 X. Patent Application Range: 1. A method of operating a data recording device (DRD) comprising a read/write data read on a data record carrier (qm) / write head (OH), and a turntable motor (TM) for rotating the data record carrier (OM), the method comprising the steps of generating a control signal (STM) for Determining the rotational frequency as a frequency curve of a function of the position (R) of the read/write head (OH) on the data record carrier (〇M) to change the rotational frequency of the turntable motor (TM) (f), the frequency curve comprises a first portion (CLV) during which the rotational frequency is reduced from a starting frequency to an intermediate frequency, the first portion (CLV) followed by a second portion ( VLV), the rotational frequency increases from the intermediate frequency to a final frequency during the second portion (VLV). 2. The method of claim 1, wherein the rotational frequency decreases substantially linearly along the first portion (CLV). 3. In the case of No. I, item 1, the rotational frequency generally increases linearly along the second portion (VLV). 4. The method of claim 1, wherein the intermediate frequency corresponds to a location of the read/write head on the data record carrier. 5. The method of claim 4, wherein the determined bit of the read/write head is adjustable. " 6. Where one of the readings is externally such as the operation of the data recording device of the whistle request 4 or 5, the determined position of the fetch/write head corresponds to the data recording area. The body 116494.doc 200823890 7· A data recording device (DRD) comprising: • a read/write head (OH) for reading/writing data on a data record carrier (〇M), • a turntable motor (TM) And for rotating the data record carrier (〇M), _ an electronic configuration (EA) coupled to the turntable motor (TM) for generating a control signal (sTM), the control signal (Stm) The turntable motor (TM) is changed according to a frequency curve in which the rotational 'frequency is defined as a function of a position (R) of the read/write head (〇H) on the data record carrier (〇M) The rotation frequency (1), the frequency curve includes a first portion (CLV) during which the rotation frequency is reduced from a starting frequency to an intermediate frequency, and the first portion (CLv) is followed by a P-first Two parts (VLV), during which the rotation frequency is from the middle part (VLV) The frequency is increased to a final frequency. 8. The data recording device of claim 7, wherein the electronic configuration (EA) generates the control signal (STM) such that the electronic_configuration during the first portion (CLV) A core current (Ic) in EA) is kept constant. 9. The data recording device of claim 7, wherein the rotational frequency is substantially linearly reduced along the first portion (CLV). The data recording device of 7, wherein the rotational frequency increases substantially linearly along the second portion (VLV). 11 - A computer readable medium storing a computer program for a data recording device, the computer The program product includes a set of instructions that, when loaded into the data recording device, cause the data recording device to perform various steps of the method of claim 1, 2, 3, 4 or 5. 116494.doc 200823890 12 a computer readable medium storing a computer program for a data recording device, the computer program product comprising a set of instructions for causing the data recording device to be triggered when the set of instructions is intercepted into the data recording device The various steps of the method of claim 6 are performed. 116494.doc