CN1508784A - Main spindle servo control method for CD drive - Google Patents
Main spindle servo control method for CD drive Download PDFInfo
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- CN1508784A CN1508784A CNA021512612A CN02151261A CN1508784A CN 1508784 A CN1508784 A CN 1508784A CN A021512612 A CNA021512612 A CN A021512612A CN 02151261 A CN02151261 A CN 02151261A CN 1508784 A CN1508784 A CN 1508784A
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- rom drive
- servo control
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Abstract
When stopping high-speed rotation of spindle motor inserted into CD or DVD disk on optical drive is requested, driving voltage inputting to the spindle motor is cut off. After detecting voltage in reverse direction happened in the spindle motor, relevant braking voltage and input time of braking voltage are searched and read out from a reference information table in order to provide a certain time for spindle motor to input the said braking voltage. Thus, it is possible to stop spindle motor in high-speed rotation safely without need of FG signal generator. The invention simplifies structure and lowers manufacturing cost.
Description
(1) technical field
The invention relates to the invention of the main axle servo control method of CD-ROM drive, in more detail about be inserted in CDs such as the CD of CD-ROM drive or DVD to just/the main axle servo control method of contrary direction high speed rotating or the CD-ROM drive that stops.
(2) background technology
Fig. 1 has represented the formation of common CD-ROM drive, and above-mentioned CD-ROM drive is made up of following parts.As read the light picker (P/U) 11 of the data on the CDs 10 such as being stored in CD or DVD, is the RF signal Processing of above-mentioned light picker output the RF handling part 12 of amplification and binary bit (Binary) signal, according to the binary bit conversion of signals of being handled by above-mentioned RF handling part (RF) 12 is the digital signal handling part (DSP) 13 of digital image or voice data, the Spindle Motor portion (SPM) 14 of the above-mentioned CD 10 of high speed rotating, the transmission motor part (SLM) 15 that above-mentioned light picker is moved to horizontal direction, give the motor driving part 16 of above-mentioned Spindle Motor portion 14 and transmission motor part 15 input driving voltages, and the servocontrol portion 17 of control said motor drive division 16 actions.
Above-mentioned Spindle Motor portion 14 also comprises with lower member: during according to the Spindle Motor in the driving voltage rotary main shaft motor part 14 of said motor drive division 16 inputs, rotation according to the respective major axes motor takes place and output pulse signal, promptly sends the FG signal generator (FG Generator) 141 of FG signal.Above-mentioned FG signal generator 141 takes place and the FG signal of output will be input to servocontrol portion 17, as shown in Figure 1.
Thereupon, servocontrol portion 17 calculates the number of FG signal within a certain period of time, calculates the rotational speed of Spindle Motor, and controls the action of motor driving part 16 according to the rotational speed of its Spindle Motor.For example on CD 10, there are scratch (Scratch) or foreign matter and when causing the fatal error of focus servo action, that is to say when emergency (Emergeney) takes place, to carry out at once to stop a series of main axle servo control actions that Spindle Motor rotates.
Fig. 2 is the action flow chart of the main axle servo control method of common CD-ROM drive, and when CDs such as CD or DVD 10 were inserted in the CD-ROM drive, servocontrol portion 17 control motor driving parts 16 were imported driving voltage respectively to Spindle Motor portion 14 and transmission motor part 15.
According to top described Spindle Motor high speed rotating and the normal action S10 that plays general data that carries out, take place this moment on CD 10, to have as mentioned above under the situation of fatal error that scratch or foreign matter etc. cause the focus servo action, just when emergency S11 took place, servocontrol portion 17 calculated the FG signal number S12 that takes place and export from the FG signal generator 141 that is included in Spindle Motor portion 14 within a certain period of time.
And according to the FG signal number of calculating, detect the rotational speed S13 of Spindle Motor,, control the action of motor driving part 16 the brake voltage of corresponding its Spindle Motor rotational speed input Spindle Motor 14 (S14) of portion.
Above-mentioned servocontrol portion 17 is when in the way of Spindle Motor high speed rotating emergency taking place, calculate the rotational speed of Spindle Motor according to the FG signal, and, cause the breakage of CD or CD-ROM drive to prevent Spindle Motor continuation rotation when being in emergency on the brake voltage input Spindle Motor that is fit to its rotational speed its CD-ROM drive being stopped.
But for the main axle servo control action, the FG signal generator of the FG signal of the rotational speed number of essential output respective major axes motor becomes the obstacle key element in this saving for the simplification of CD-ROM drive and manufacturing cost.
(3) summary of the invention
The present invention is for addressing the above problem, its purpose is to provide a kind of FG signal generator (FG Generator) of calculating the Spindle Motor rotational speed that do not use also can be when emergency takes place, and just stops the main axle servo control method at the CD-ROM drive of the Spindle Motor of high speed rotating safely.
For reaching above-mentioned purpose, the main axle servo control method of CD-ROM drive of the present invention is characterized in comprising following three phases: the phase one is for cutting off the driving voltage that is input to Spindle Motor;
Subordinate phase begins to detect the revers voltage that described Spindle Motor takes place for the initial point that cuts off at described driving voltage; And
Phase III is to give the input of Spindle Motor certain hour the brake voltage of corresponding described detected revers voltage.
For further specifying above-mentioned purpose of the present invention, design feature and effect, the present invention is described in detail below with reference to accompanying drawing.
(4) description of drawings
Fig. 1 is the formation of existing CD-ROM drive.
Fig. 2 is the action flow chart of the main axle servo control method of existing CD-ROM drive.
Fig. 3 is the formation according to the CD-ROM drive of the main axle servo control method of CD-ROM drive of the present invention.
Fig. 4 is the action flow chart according to the main axle servo control method of CD-ROM drive of the present invention.
Fig. 5 is the reference information table according to the specific embodiment of the invention.
(5) embodiment
Fig. 3 is the formation according to the CD-ROM drive of main axle servo control method of the present invention, and above-mentioned CD-ROM drive such as Fig. 1 explanation possess as lower member.Read the light picker (P/U) 11 of the data on the CDs 10 such as being stored in CD or DVD; Is the RF signal Processing of above-mentioned light picker output the RF signal processing part (RF) 12 of amplification and binary bit (Binary) signal; The binary bit signal Processing that above-mentioned RF signal processing part 12 is handled is the digital signal handling part (DSP) 13 of digital image or voice data; The Spindle Motor portion (SPM) 24 of the above-mentioned CD 10 of high speed rotating; Move the transmission motor part 15 (SLM) of above-mentioned light picker 11 to horizontal direction; In order to give the motor driving part 16 of above-mentioned Spindle Motor portion 24 and transmission motor part 15 input driving voltages; And the servocontrol portion 27 of control said motor drive division 16.
Above-mentioned CD-ROM drive can possess the Time Calculation portion 28 of calculating certain hour again, moreover the time according to the driving voltage rotation motor of said motor drive division 16 input, above-mentioned Spindle Motor portion 24 does not comprise the pulse signal that takes place and export corresponding above-mentioned Spindle Motor rotation quantity, that is to say not comprise to take place and the FG signal generator of output FG signal.
Like this when on CD 10, having scratch (Scratch) or foreign matter etc. and cause the 27 focus servos action of above-mentioned servocontrol portion to produce fatal error, that is to say when urgent (Emergeney) situation takes place and do not use above-mentioned signal generator also can carry out the rotation that a series of main axle servo control action stops above-mentioned Spindle Motor, below this is described in detail.
Fig. 4 is the action flow chart according to the main axle servo control method of CD-ROM drive of the present invention, when CDs such as CD or DVD 10 insert CD-ROM drive, the action of the servocontrol portion 27 control motor driving parts 16 of CD-ROM drive is respectively to Spindle Motor portion 24 and transmission motor part 15 input driving voltages.
According to top step, Spindle Motor meeting high speed rotating is with normal execution general data playback action S20, work as this moment and take place to cause under the situation of fatal errors such as focus servo action because of having scratch or foreign matter on the CD 10, that is to say S21 when emergency takes place, the driving voltage S22 that is input to Spindle Motor portion 24 is cut off in the action of servocontrol portion 27 control said motor drive divisions 16.
Detect the revers voltage S23 that the Spindle Motor output of above-mentioned driving voltage has been cut off in affirmation in servocontrol portion 27 simultaneously, the value of above-mentioned revers voltage is the rotational speed of direct ratio and above-mentioned Spindle Motor, and above-mentioned servocontrol portion 27 utilizes and is included in its inner A/D transcriber (ADC) 29 and measures driving voltage values.
The servocontrol portion 27 of detecting revers voltage by said process as shown in Figure 5, the reference information table that is write down according to the pretest result, the search relationship record has the brake voltage of corresponding each revers voltage and S24 input time of its brake voltage, and the brake voltage and the time of optionally reading corresponding its revers voltage.
Such as, when the revers voltage of Spindle Motor output is 7V-Max, read the brake voltage and the time of corresponding its revers voltage respectively according to test findings: 7V-Max and 1.5sec, when the revers voltage of Spindle Motor output is 6.5V-Max, read the brake voltage and the time of corresponding its revers voltage: 6V and 1.2sec, the action of servocontrol portion 27 control motor driving parts 16 afterwards, the brake voltage that above-mentioned detection is read is input to Spindle Motor portion 24 (S25).Confirm then whether the Time Calculation value that above-mentioned Time Calculation portion 28 is calculated passes through above-mentioned brake voltage S26 input time.
Detect the brake voltage and the time of the revers voltage that reads corresponding Spindle Motor in other words from the reference information table, after the brake voltage of corresponding its revers voltage is input to Spindle Motor portion 24 according to time of its detection, at the initial point that has passed through its time, carry out and differentiate for stopping a succession of main shaft control action S27 of Spindle Motor rotation.Thereupon, when emergency takes place in servocontrol portion 27 in Spindle Motor high speed rotating way, cut-out is input under the state of driving voltage of Spindle Motor, detects the revers voltage and the brake voltage of corresponding its revers voltage of input within a certain period of time, stops the running of Spindle Motor safely with this.
In the rotational speed or deceleration of quickening above-mentioned Spindle Motor, also temporarily disconnected is input to the driving voltage of Spindle Motor as mentioned above, detection is behind the revers voltage of its initial point, detect the rotational speed of the Spindle Motor of corresponding its revers voltage, should record the rotating speed data of corresponding each revers voltage test findings in more detail this moment on the reference information table.
Simultaneously comprising to possess in above-mentioned servocontrol portion has, and can be the algorithm that benchmark calculates rotational speed with above-mentioned revers voltage, and can utilize this to calculate the rotational speed of Spindle Motor.
Main axle servo control method according to CD-ROM drive of the present invention is as mentioned above, the Spindle Motor of CDs such as CD or DVD in the high speed rotating CD-ROM drive, because the emergency that can stop the rotation, so be input to the driving voltage of Spindle Motor in cut-out after, the revers voltage that detection takes place from its initial point, and read corresponding brake voltage and brake voltage input time from the reference information table, simultaneously its brake voltage certain hour being input to Spindle Motor stops by it, thereby do not use the FG signal can accomplish that also safety stops the Spindle Motor of high speed rotating, thereby realize the purpose that CD-ROM drive is oversimplified and manufacturing cost is saved.
Certainly, those of ordinary skill in the art will be appreciated that, above embodiment is used for illustrating the present invention, and be not to be used as limitation of the invention, as long as in connotation scope of the present invention, all will drop in the scope of claims of the present invention variation, the modification of the above embodiment.
Claims (3)
1. the main axle servo control method of a CD-ROM drive is characterized in that comprising as the next stage:
Phase one is for cutting off the driving voltage that is input to Spindle Motor;
Subordinate phase begins to detect the revers voltage that described Spindle Motor takes place for the initial point that cuts off at described driving voltage; And
Phase III is to give the input of Spindle Motor certain hour the brake voltage of corresponding described detected revers voltage.
2. as the main axle servo control method of claims 1 described CD-ROM drive, it is characterized in that, optionally import brake voltage and brake voltage input time of the revers voltage of corresponding described detection according to the reference information table of prior setting in the described phase III.
3. as the main axle servo control method of claims 1 described CD-ROM drive, it is characterized in that described reference information table is, preserve each brake voltage and brake voltage input time of corresponding revers voltage with catalogue form contact.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA021512612A CN1508784A (en) | 2002-12-13 | 2002-12-13 | Main spindle servo control method for CD drive |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA021512612A CN1508784A (en) | 2002-12-13 | 2002-12-13 | Main spindle servo control method for CD drive |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1508784A true CN1508784A (en) | 2004-06-30 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA021512612A Pending CN1508784A (en) | 2002-12-13 | 2002-12-13 | Main spindle servo control method for CD drive |
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| CN (1) | CN1508784A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101488351B (en) * | 2008-01-14 | 2011-07-27 | 鸿富锦精密工业（深圳）有限公司 | Optical disc playing device and motor controlling method thereof |
| CN103871435A (en) * | 2012-12-10 | 2014-06-18 | 建兴电子科技股份有限公司 | CD-ROM drive and operation method thereof |
-
2002
- 2002-12-13 CN CNA021512612A patent/CN1508784A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101488351B (en) * | 2008-01-14 | 2011-07-27 | 鸿富锦精密工业（深圳）有限公司 | Optical disc playing device and motor controlling method thereof |
| CN103871435A (en) * | 2012-12-10 | 2014-06-18 | 建兴电子科技股份有限公司 | CD-ROM drive and operation method thereof |
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