CN1460997A - Control method of multistage mother disk etching recording and laser driving device for etching and recording - Google Patents
Control method of multistage mother disk etching recording and laser driving device for etching and recording Download PDFInfo
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- CN1460997A CN1460997A CN 03121143 CN03121143A CN1460997A CN 1460997 A CN1460997 A CN 1460997A CN 03121143 CN03121143 CN 03121143 CN 03121143 A CN03121143 A CN 03121143A CN 1460997 A CN1460997 A CN 1460997A
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Abstract
The control method of n-order master disk etch-recording is characterized by that on the basis of traditional second-order master disk etch-recording control method a gating control of n-order power and a magnitude stability control of n-order power are added. According to said control method a laser driving device is designed, and a driving circuit capable of implementing n-order power gating and regulation is adopted, and said driving circuit contains a power gating regulation circuit formed from triode resistor network and differential operation amplifier and a power amplification circuit. Said method can effectively control n-order etch-recording on master disk.
Description
Technical field:
The laser drive that the control method of multistage mother CD burning and imprinting are used belongs to the fine field of engineering technology in the mother CD burning.
Background technology:
Traditional second order CD is that the pit by imprinting on the disc comes record data, and each information symbol can only write down " 0 " and " 1 " two states, and the capacity and the transfer rate of this CD are low.Professors Xu Duanyi of Tsing-Hua University etc. propose the method for multi-stage optical disk storage, this method is to apply one deck photographic layer on disc, photographic layer is for the absorptivity difference of the laser of varying strength (power), form different gray areas, on photographic layer with the laser focusing of different capacity, just can produce a series of half-tone informations, form multi-stage optical disk.The memory capacity of this multi-stage optical disk is big, and transfer rate is also very high.In existing document, relevant for the making of multistage stamper and the document of reproduction technology aspect, but through retrieval, the domestic and international document that does not retrieve the control method of multistage mother CD burning and realize multistage power gating and regulating device aspect.
Summary of the invention:
The objective of the invention is to,, proposed the control method of multistage mother CD burning and the laser drive that imprinting is used, promptly realize the device of multistage power gating and adjusting at the imprinting process of multistage stamper.
The control method of multistage mother CD burning proposed by the invention is characterized in that, it contains the following steps of carrying out in computing machine: 1) given machining information: imprinting position polar coordinates (ρ
z, θ
z): the imprinting track is followed successively by (ρ
0, θ
0), (ρ
1, θ
1) ... (ρ
z, θ
z), (ρ wherein
0, θ
0) be initial position, (ρ
z, θ
z) be final position; The performance number P of each imprinting position correspondence
z: be followed successively by P by the imprinting position
0, P
1P
zThe time t of imprinting should be carried out in each imprinting position
z, be followed successively by t by the imprinting position
0, t
1T
zConstant linear velocity V along imprinting track on the stamper; The track pitch a of imprinting track on the stamper; Specification of variables: the actual position coordinate of establishing the detected worktable of laser interferometer is (ρ
z', θ
z'); The actual speed ω of worktable
z'=(θ
z'-θ
Z+1')/T, the actual translational velocity V of worktable
Rz'=(ρ
z'-ρ
Z+1')/T, wherein (ρ
Z+1', θ
Z+1') be the next position coordinate of the detected worktable of laser interferometer; T is the sense cycle of laser interferometer; If worktable in-position (ρ
z', θ
z') rotating speed of time design is ω
z=V/ ρ
z', the translational velocity of design is V
Rz=aV/ (2 π ρ
z'); If the detected real power value of power detector is P
z'; 2) obtain the detected worktable actual position coordinate of laser interferometer (ρ
z', θ
z') after, carry out 2.1 simultaneously) step and 2.2) step: 2.1) speed of worktable is regulated: 2.1.1) obtain the next position coordinate (ρ that laser interferometer detects worktable
Z+1', θ
Z+1'), the evaluation work platform
Actual speed ω
z', the actual translational velocity V of worktable
Rz'; The design speed ω of evaluation work platform
zWith the design
Translational velocity V
Rz, with ω
z' and ω
zCompare, with V
Rz' and V
RzCompare, and with ω
zAnd V
RzFor
Standard by regulating the rotary electric machine and the translation motor of worktable, makes ω
z'=ω
z, V
Rz'=V
Rz, to keep
Linear velocity V along imprinting track on the stamper is constant; 2.1.2) continue to obtain the next position coordinate of worktable by laser interferometer, carry out the adjusting of rotating speed and translational velocity,
Constant to keep along the linear velocity V of imprinting track on the stamper; 2.2) the imprinting process: 2.2.1) as the physical location (ρ of worktable
z', θ
z') with machining information in relevant position (ρ
z, θ
z) when consistent,
Access the performance number P of this position correspondence
zAnd the imprinting time t of this position correspondence
z, setting laser device power is
P
z, open laser instrument; 2.2.2) obtain the detected real power value of power detector P
z', with setting power value P
zBe as the criterion, the adjusting laser instrument
Performance number P
z', make P
z'=P
z, to keep performance number P
zStable; 2.2.3) focus, focal length carries out imprinting after harmonizing, and the imprinting time is t
z2.2.4) judge this imprinting position (ρ
z', θ
z') whether be final position (ρ
z, θ
z), if then imprinting is intact
Finish, finish; If not then imprinting does not finish, and returns 2.2.1) step, prepare to carry out imprinting next time.
The laser drive that the designed imprinting of described multistage mother CD burning control method is used, containing input end links to each other with the signal output part of upper end industrial computer, the driving circuit that output terminal links to each other with the signal input part of laser instrument, link to each other with the feedback signal output terminal of laser instrument with input end, the feedback circuit that output terminal links to each other with the feedback signal input end of driving circuit, it is characterized in that, described driving circuit is the driving circuit that can carry out power order gating and adjusting, it contains the power gating regulating circuit and the power amplification circuit of series connection successively, the gating signal input end of described power gating regulating circuit links to each other with the gating signal output terminal of upper end industrial computer, the output terminal of described power amplification circuit links to each other with the signal input part of described laser instrument, and the feedback signal input end of described power gating regulating circuit links to each other with the output terminal of described feedback circuit.
Described power gating regulating circuit contains a triode resistor network and the differential operational amplifier (U1) that can realize the power gating; Described triode resistor network contains 4 triodes (GB1～GB4), (GB1～base stage GB4) connects the gating signal output terminal of described industrial computer respectively to described triode, (R1～R4) connects the input end of power amplification circuit to the resistance of its emitter by series connection separately jointly, the common output terminal that connects described differential operational amplifier (U1) of its collector; The normal phase input end of described differential operational amplifier (U1) connects stabilized voltage supply, and its reverse input end connects the signal output part of above-mentioned feedback circuit, and its output terminal connects the described triode (collector of GB1～GB4).
Described power amplification circuit contains a triode (GB5), and the base stage of described triode (GB5) links to each other with the signal output part of described power gating regulating circuit, and its collector connects stabilized voltage supply, sends out the signal input part that its emitter-base bandgap grading connects laser instrument.
Described feedback circuit contains an in-phase proportion operational amplifier (U2), and the input end of described in-phase proportion operational amplifier (U2) connects the feedback signal output terminal of laser instrument, and its output terminal connects the feedback signal input end of described power gating regulating circuit.
Evidence utilizes the control method of multistage mother CD burning proposed by the invention, can effectively be controlled at the multistage imprinting of carrying out on the stamper.The laser drive that the present invention proposes can change the electric current that flows through laser instrument, makes laser instrument send the laser of different capacity, thus under imprinting on the stamper photographic layer signal of different gray scales, realize multistage imprinting, reached its intended purposes.
Description of drawings:
Fig. 1 is multistage mother CD burning control system block diagram;
Fig. 2 is multistage mother CD burning control method software flow pattern;
Fig. 3 is rotating speed of table and translation speed control subroutine flow chart;
Fig. 4 is an imprinting process control subroutine flow chart;
Fig. 5 is the schematic block circuit diagram of laser drive;
Fig. 6 is the circuit theory diagrams of laser drive.
Embodiment:
Accompanying drawings the specific embodiment of the present invention.
Be to realize the needed control system block diagram of this control method as shown in Figure 1.Among the figure, worktable is realized rotating and translation by rotary electric machine and translation motor, thereby it is the helical trajectory of initial point that the imprinting track is with the stamper center, laser interferometer is sent to computing machine with the position polar coordinates of worktable, handle by computing machine, and the rotating speed and the translational velocity of regulating worktable according to result, to keep constant along the linear velocity V of the imprinting track on the stamper.In addition, computing machine compares the physical location of worktable and the positional information in the machining information, determines the pairing power order in this position, and opens laser instrument with this power order and carry out imprinting.In the imprinting process, the required power detector detects the real power value, sends computing machine to, is come to compare with given power by computing machine, and send the result to laser power device drive unit by industrial computer, realize the selection of power and regulate power by laser drive.Focus control and photodetector are used to the laser focal of harmonizing, and carry out imprinting.Different is that function that the laser drive in this control system realizes is different with the imprinting control system of traditional second order stamper, and it can carry out gating to different power orders according to computer commands.Therefore, its corresponding circuit theory diagrams are also different, will introduce the circuit working principle of laser drive of the present invention in the back in conjunction with the accompanying drawings.
The control method of the multistage mother CD burning that the present invention proposes is on the basis of traditional second order mother CD burning control method, has increased the gating control of multistage power and the stable control of size of multistage power.It comprises Fig. 2, Fig. 3 and control program process flow diagram and sub-process figure shown in Figure 4.
As shown in Figure 2, program begins to carry out initialization, and initialization mainly is the input and the specification of variables of machining information, and initialization thes contents are as follows: the input machining information:
Imprinting position polar coordinates (ρ
z, θ
z): the imprinting track is followed successively by (ρ
0, θ
0), (ρ
1, θ
1) ... (ρ
z, θ
z), wherein
(ρ
0, θ
0) be initial position, (ρ
z, θ
z) be final position;
The performance number P of each imprinting position correspondence
z(P
zCertain single order in the power of corresponding n rank): be followed successively by P by the imprinting position
0, P
1P
z
The time t of imprinting should be carried out in each imprinting position
z, be followed successively by t by the imprinting position
0, t
1T
z
Constant linear velocity V along imprinting track on the stamper;
The track pitch a of imprinting track on the stamper; Specification of variables:
If the actual position coordinate of the detected worktable of laser interferometer is (ρ
z', θ
z');
The actual speed ω of worktable
z'=(θ
z'-θ
Z+1')/T, the actual translational velocity V of worktable
Rz'=(ρ
z'-ρ
Z+1')/T, wherein (ρ
Z+1', θ
Z+1') be the next position coordinate of the detected worktable of laser interferometer; T is the sense cycle of laser interferometer;
If worktable in-position (ρ
z', θ
z') rotating speed of time design is ω
z=V/ ρ
z', the translational velocity of design is V
Rz=aV/ (2 π ρ
z');
If the detected real power value of power detector is P
z';
If the intermediate variable of worktable actual position coordinate is (ρ
i', θ
i').After the initialization, computing machine begins the position coordinates of the detected worktable of continuous acquisition laser interferometer, and computing machine also need be monitored the rotating speed and the translational velocity of worktable in monitoring imprinting process, make along the linear velocity V of imprinting track on the stamper constant.
Rotating speed of table as shown in Figure 3 and translation speed control subroutine flow chart.Because the linear velocity V along the mother CD burning track need be constant, just can make laser interferometer according to (ρ
0, θ
0), (ρ
1, θ
1) ... (ρ
z, θ
z) sequence detection to the position for the treatment of imprinting, and there are funtcional relationship: ω in the design speed of linear velocity V and worktable and design between the translational velocity
z=V/ ρ
z', V
Rz=aV/ (2 π ρ
z'); Therefore just can make linear velocity V constant by regulating rotating speed of table and translational velocity.Rotating speed of table and translational velocity regulative mode are: laser interferometer obtains the actual position coordinate (ρ of worktable
z', θ
z') and the next position coordinate (ρ
Z+1', θ
Z+1'), collection period T guarantees its precision by system clock, then the worktable actual speed is approximately ω with the average velocity in the T time
z'=(θ
z'-θ
Z+1')/T, the actual translational velocity of worktable also is approximately V with average velocity
Rz'=(ρ
z'-ρ
Z+1')/T.Actual speed and translational velocity and design load are compared, and regulate, thereby guarantee that V's is constant.The calculating of worktable actual speed and translational velocity can be calculated once every N the cycle (NT), and the present invention selects position coordinates of every collection to calculate once, makes the precision of calculating higher like this.
Imprinting procedure subprogram process flow diagram as shown in Figure 4.Laser interferometer compares the positional information in the machining information of detected operating position coordinate and input, judged whether should imprinting the position, if this position is the imprinting position, then access corresponding power P
z, and the power of laser instrument is strobed into power P by industrial computer order laser drive
z, open laser instrument, prepare with this power P
zCarry out imprinting.Here symbol ρ
i', θ
i' be the intermediate variable of operating position coordinate.After laser instrument is opened, detect the practical laser power P by power detector
z' size of (intensity), and send computing machine to, with given power P
zCompare, and with P
zBe as the criterion, with real power P
z' be adjusted to and P
zUnanimity makes performance number stable.Order focus control to be focused then.Focal length promptly begins imprinting after harmonizing, and the imprinting time is t
zThe collection period T of laser interferometer accords with 1/4 of time length less than the minimal information of institute's imprinting, accords with position sampling more than 4 times, to guarantee to be burnt to each information for each information.Stamper is installed on the sucker of worktable, guarantees the location with anchor clamps, the center of stamper is determined automatically according to the center of worktable sucker, just can be determined that with this geometric center of stamper card is exactly the initial initial point of imprinting position.
Laser drive of the present invention is different from the employed laser drive of second order mother CD burning of prior art, the laser driving apparatus that the second order mother CD burning is used is only controlled the on off state of laser instrument, required power is not selected, therefore, its circuit is simpler, general needs a chip for driving that is serially connected between industrial computer and the laser instrument, and the feedback circuit between laser instrument and the chip for driving.This device is in order to realize multistage power gating and regulatory function, adopted one can realize the gating of multistage power and the driving circuit of adjusting, the schematic block circuit diagram of this device as shown in Figure 5, driving circuit contains power gating regulating circuit and power amplification circuit, power gating regulating circuit receives the power signal that industrial computer is sent, according to different power orders, the signal of output varying strength (power) is given power amplification circuit, power signal after power amplification circuit will amplify sends laser instrument to, makes laser instrument send the laser of varying strength (power).Because laser instrument itself produces signal fluctuation, cause power output unstable, its feedback signal output terminal is exported to feedback circuit with feedback signal, again by opposing that circuit sends power gating regulating circuit to, through overregulating to keep the power stability of laser instrument output.
The circuit theory diagrams of laser drive as shown in Figure 6.The gating of power order is realized by the triode resistor network, if the power order of imprinting is the n rank, then the triode resistor network contains n triode accordingly, resistance of emitter series connection of each triode, and the size of resistance has determined the size of gated on power.As in this example, the power order is selected 4 rank PI, PII, and PIII, PIV, 4 triodes then should be arranged in the resistor network mutually, and (GB1～GB4), carry out imprinting if computing machine is specified with power P I then sends instruction to industrial computer, comes the corresponding triode conducting of gating by industrial computer.
The in-phase input end of difference amplifier U1 connects stabilized voltage supply, and inverting input receives the feedback signal of laser instrument U3 by feedback circuit.Laser instrument U3 is because the interference of extraneous factors such as temperature, emitted laser power is changed, the electric current that its pin one this moment (feedback signal output terminal) flows out is respective change also, these two kinds of variations are homophases, when laser instrument emitted laser power becomes big, the electric current that its pin one flows out also increases, and when laser power diminished, the electric current that its pin one flows out also reduced.So when laser power changes, the inverting input of difference amplifier obtains a voltage signal with phase change, make the anti-phase variation of voltage signal of output terminal, thereby the electric current of having controlled the emitter of triode resistor network changes, finally suppressed to flow through the variation of the size of current of laser instrument U3, the laser power stability that laser instrument U3 is sent, so difference amplifier U1 plays the effect of power adjustments.
Triode GB5 plays the effect of power amplification among Fig. 6, and the electric current of resistor network output is amplified to is enough to drive laser U3 work.In-phase proportion amplifier U2 is a feedback circuit among the figure, and it amplifies the signal of the feedback signal output terminal output of laser instrument U3, and then signal is exported to difference amplifier U1 carry out difference processing.
In this drive unit, the model of triode is 2N1711, and the model of differential operational amplifier U1 and in-phase proportion operational amplifier U2 is LF356N.R6～R13 is a current-limiting resistance among Fig. 6, and C1 is an electric capacity of voltage regulation, and D1, D2 are the ground connection diode.
With CD stamper of imprinting is example, adopting power is the 405nm semiconductor laser of 30mW, controls its power by controlling its working current, uses 4 kinds of different capacities of 30mW, 28mW, 26mW, 24mW, the center of circle of definition stamper is a work origin (0,0), the imprinting reference position is (16mm, 0), the imprinting final position is (117mm, 0), be 3.48m/s along the linear velocity of imprinting track on the stamper, track pitch 0.68 μ m.According to imprinting position difference, obtain that rotating speed of table changes to 4.7r/s from 34.6r/s in the imprinting process, translational velocity changes to 3.2 μ m/s from 23.6 μ m/s.Worktable stroke radially is 200mm.Imprinting obtains 4 rank stampers after finishing, and the capacity of stamper can be increased to 2GB from 650MB.
Claims (5)
1, the control method of multistage mother CD burning is characterized in that, it contains the following steps of carrying out in computing machine: 1) given machining information: imprinting position polar coordinates (ρ
z, θ
z): the imprinting track is followed successively by (ρ
0, θ
0), (ρ
1, θ
1) ... (ρ
z, θ
z), (ρ wherein
0, θ
0) be initial position, (ρ
z, θ
z) be final position; The performance number P of each imprinting position correspondence
z: be followed successively by P by the imprinting position
0, P
1P
zThe time t of imprinting should be carried out in each imprinting position
z, be followed successively by t by the imprinting position
0, t
1T
zConstant linear velocity V along imprinting track on the stamper; The track pitch a of imprinting track on the stamper; Specification of variables: the actual position coordinate of establishing the detected worktable of laser interferometer is (ρ
z', θ
z'); The actual speed ω of worktable
z'=(θ
z'-θ
Z+1')/T, the actual translational velocity V of worktable
Rz'=(ρ
z'-ρ
Z+1')/T, wherein (ρ
Z+1', θ
Z+1') be the next position coordinate of the detected worktable of laser interferometer; T is the sense cycle of laser interferometer; If worktable in-position (ρ
z', θ
z') rotating speed of time design is ω
z=V/ ρ
z', the translational velocity of design is V
Rz=aV/ (2 π ρ
z'); If the detected real power value of power detector is P
z'; 2) obtain the detected worktable actual position coordinate of laser interferometer (ρ
z', θ
z') after, carry out 2.1 simultaneously) step and 2.2) step: 2.1) speed of worktable is regulated: 2.1.1) obtain the next position coordinate (ρ that laser interferometer detects worktable
Z+1', θ
Z+1'), the evaluation work platform
Actual speed ω
z', the actual translational velocity V of worktable
Rz'; The design speed ω of evaluation work platform
zWith the design
Translational velocity V
Rz, with ω
z' and ω
zCompare, with V
Rz' and V
RzCompare, and with ω
zAnd V
RzFor
Standard by regulating the rotary electric machine and the translation motor of worktable, makes ω
z'=ω
z, V
Rz'=V
Rz, to keep
Linear velocity V along imprinting track on the stamper is constant; 2.1.2) continue to obtain the next position coordinate of worktable by laser interferometer, carry out the adjusting of rotating speed and translational velocity,
Constant to keep along the linear velocity V of imprinting track on the stamper; 2.2) the imprinting process: 2.2.1) as the physical location (ρ of worktable
z', θ
z') with machining information in relevant position (ρ
z, θ
z) when consistent,
Access the performance number P of this position correspondence
zAnd the imprinting time t of this position correspondence
z, setting laser device power is
P
z, open laser instrument; 2.2.2) obtain the detected real power value of power detector P
z', with setting power value P
zBe as the criterion, the adjusting laser instrument
Performance number P
z', make P
z'=P
z, to keep performance number P
zStable; 2.2.3) focus, focal length carries out imprinting after harmonizing, and the imprinting time is t
z2.2.4) judge this imprinting position (ρ
z', θ
z') whether be final position (ρ
z, θ
z), if then imprinting is intact
Finish, finish; If not then imprinting does not finish, and returns 2.2.1) step, prepare to carry out imprinting next time.
2, the laser drive that the designed imprinting of multistage mother CD burning control method according to claim 1 is used, containing input end links to each other with the signal output part of upper end industrial computer, the driving circuit that output terminal links to each other with the signal input part of laser instrument, link to each other with the feedback signal output terminal of laser instrument with input end, the feedback circuit that output terminal links to each other with the feedback signal input end of driving circuit, it is characterized in that, described driving circuit is the driving circuit that can carry out power order gating and adjusting, it contains the power gating regulating circuit and the power amplification circuit of series connection successively, the gating signal input end of described power gating regulating circuit links to each other with the gating signal output terminal of upper end industrial computer, the output terminal of described power amplification circuit links to each other with the signal input part of described laser instrument, and the feedback signal input end of described power gating regulating circuit links to each other with the output terminal of described feedback circuit.
3, the laser drive used of imprinting as claimed in claim 2 is characterized in that described power gating regulating circuit contains a triode resistor network and the differential operational amplifier (U1) that can realize the power gating; Described triode resistor network contains 4 triodes (GB1～GB4), (GB1～base stage GB4) connects the gating signal output terminal of described industrial computer respectively to described triode, (R1～R4) connects the input end of power amplification circuit to the resistance of its emitter by series connection separately jointly, the common output terminal that connects described differential operational amplifier (U1) of its collector; The normal phase input end of described differential operational amplifier (U1) connects stabilized voltage supply, and its reverse input end connects the signal output part of above-mentioned feedback circuit, and its output terminal connects the described triode (collector of GB1～GB4).
4, the laser drive used of imprinting as claimed in claim 2, it is characterized in that, described power amplification circuit contains a triode (GB5), the base stage of described triode (GB5) links to each other with the signal output part of described power gating regulating circuit, its collector connects stabilized voltage supply, sends out the signal input part that its emitter-base bandgap grading connects laser instrument.
5, the laser drive used of imprinting as claimed in claim 2, it is characterized in that, described feedback circuit contains an in-phase proportion operational amplifier (U2), the input end of described in-phase proportion operational amplifier (U2) connects the feedback signal output terminal of laser instrument, and its output terminal connects the feedback signal input end of described power gating regulating circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03121143 CN1200410C (en) | 2003-03-28 | 2003-03-28 | Control method of multistage mother disk etching recording and laser driving device for etching and recording |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03121143 CN1200410C (en) | 2003-03-28 | 2003-03-28 | Control method of multistage mother disk etching recording and laser driving device for etching and recording |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1460997A true CN1460997A (en) | 2003-12-10 |
| CN1200410C CN1200410C (en) | 2005-05-04 |
Family
ID=29591057
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 03121143 Expired - Fee Related CN1200410C (en) | 2003-03-28 | 2003-03-28 | Control method of multistage mother disk etching recording and laser driving device for etching and recording |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1200410C (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100452209C (en) * | 2005-03-08 | 2009-01-14 | 清华大学 | Method for producing multi-exponent read-only mother disc |
| CN100452203C (en) * | 2005-03-08 | 2009-01-14 | 上海香樟电子有限公司 | Manufacturing method of multistage read-only master |
| CN100452204C (en) * | 2005-03-08 | 2009-01-14 | 上海香樟电子有限公司 | Manufacturing method of multistage CDROM |
| CN101221784B (en) * | 2006-09-05 | 2010-09-22 | 国际商业机器公司 | Method and device for servo frame velocity calculations of a storage media |
-
2003
- 2003-03-28 CN CN 03121143 patent/CN1200410C/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100452209C (en) * | 2005-03-08 | 2009-01-14 | 清华大学 | Method for producing multi-exponent read-only mother disc |
| CN100452203C (en) * | 2005-03-08 | 2009-01-14 | 上海香樟电子有限公司 | Manufacturing method of multistage read-only master |
| CN100452204C (en) * | 2005-03-08 | 2009-01-14 | 上海香樟电子有限公司 | Manufacturing method of multistage CDROM |
| CN101221784B (en) * | 2006-09-05 | 2010-09-22 | 国际商业机器公司 | Method and device for servo frame velocity calculations of a storage media |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1200410C (en) | 2005-05-04 |
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