CN101211579A

CN101211579A - Optical disc device main shaft speed controlling method

Info

Publication number: CN101211579A
Application number: CNA2006101482810A
Authority: CN
Inventors: 郑明首
Original assignee: Shanghai LG Electronics Co Ltd
Current assignee: Shanghai LG Electronics Co Ltd
Priority date: 2006-12-29
Filing date: 2006-12-29
Publication date: 2008-07-02

Abstract

The invention relates to a method for controlling the main axis speed of compact disc apparatus. For example, in DVD and other compact disc apparatuses, if fatal playing error occurs during playing vibration-free compact disc, the playing action is operated again after increasing the main axis speed, while occurring reason of the playing error is determined, if the occurring reason of the determined playing error is focus drop. If the occurring reason of the determined playing error is the errors caused by error detecting code or playing RF jitter characteristic, the playing action is operated again after decreasing the main axis speed. Therefore, the invention is extremely useful for playing action of the vibration-free compact disc and allows existence of offset part during effective normal operation.

Description

Main shaft speed controlling method in the optical disc apparatus

Technical field

The present invention is relevant with the main shaft speed controlling method in the optical disc apparatus, especially with in optical disc apparatus such as DVD player DVD-Player, during existence shifts into exempting from of grading and shakes the broadcast of CD, for the main shaft speed controlling method in a kind of optical disc apparatus of appropriate control spindle speed relevant.

Background technology

Fig. 1 illustrates the formation of general optical disc apparatus, for example, in DVD player optical disc apparatus such as (DVD-Player), be included as the light picker 11 of reading the data of record in the CD 10, for being the RF handling part 12 of binary bit (Binary) signal and output, and be the digital signal processing portion (DSP) 13 that is DAB and vision signal to the RF signal transformation of output from above-mentioned light picker 11 to above-mentioned binary bit signal Processing.

In addition, for trail-and-error signal (TE) and the focus error signal (FE) that makes output from above-mentioned light picker 11 becomes the minimum value that approaches zero Zero, in operation tracking and focus servo running, running control motor driver 16 comprises servo 14 of spindle motor (Spindle) M2 of traction electric machine (Sled) M1 that transfers above-mentioned light picker 11 and the above-mentioned CD 10 of driven in rotation.

And, be included as and hang down the low-pass filter (LPF) 17 that filters the focus error signal of exporting from the photodiode PD of above-mentioned light picker 11 and be the A/D transducer 18 of the above-mentioned low-pass filter 17 of foundation with the focus error signal of the formal argument filtration of digital signal, and the digital signal that detects conversion according to A/D transducer 18, above-mentioned CD 10 exempt to shake composition, be above-mentioned servo 14 microcomputer 15 of running control.

Fig. 2 illustrates the operation workflow synoptic diagram that exempting from the general optical disc apparatus shaken the CD method for detecting.

S10, S11, if for example insert fixing disc 10 in optical disc apparatus such as DVD player, in above-mentioned motor driver 16, rotation drives above-mentioned spindle motor M2 and traction electric machine M1, when rotation drives above-mentioned CD, above-mentioned light picker 11 is moved to suitable position.

S12, S13 on the one hand, in above-mentioned microcomputer 15, detect after the focus drive signal by above-mentioned low-pass filter 17 and A/D transducer 18, and for example focus error signal according to the above-mentioned value that detects, detects the vibrations degree that exists in the CD.

S14 judges whether the vibrations degree surpasses the tolerance band of setting in advance.

S15, for example, when the above-mentioned extent of vibration that detects surpasses the tolerance band of setting in advance, in above-mentioned microcomputer 15, above-mentioned servo 14 of running control, the spindle speed that slows down is low multiple to the broadcast multiple variable adjustment of CD.

S16, in contrast, when the above-mentioned vibrations degree of exempting from that detects did not surpass the tolerance band of setting in advance, in above-mentioned microcomputer 15, spindle speed was still kept in above-mentioned servo 14 of running control, and the broadcast multiple of CD is set at positive multiplying constant.

S17, and, in above-mentioned microcomputer 15, because a series of broadcast running of operation user application etc., for example, in the outside field of CD etc., exist skew to wait the crooked composition of CD, even rotation produces and exempts to shake according to CD, also will be low multiple to the broadcast multiple variable adjustment of CD, running is play in normal operation.

But, in general optical disc apparatus, as the above-mentioned CD that is inserted into device inside, if differentiated when exempting to shake CD, be reduced to low multiple owing to want unconditional playing multiple, for example, if do not exist a lot of skew compositions exempt from shake CD and rotate to be low multiple, centrifugal force to CD outside effect reduces, and has the problem that fatal error can take place when focus servo running etc. on the contrary.

Summary of the invention

Therefore, the present invention puts forward for addressing the above problem, for example, in optical disc apparatus such as DVD player DVD-Player, if in broadcast exempts to shake the way of CD, make a mistake, confirm its wrong occurrence cause, optionally increase or the spindle speed that slows down (Spindle Speed), provide a kind of for making the main shaft speed controlling method in the optical disc apparatus of playing the normal operation of running, this is a purpose of the present invention.

For reaching above-mentioned purpose, main shaft speed controlling method in the optical disc apparatus of the present invention comprises the 1st step, if in broadcast exempts to shake the way of CD, make a mistake, confirm its wrong occurrence cause, and the 2nd step, if the reason that above-mentioned affirmation result takes place for mistake is by focusing on the mistake that shade causes, after increasing spindle speed, reruns the broadcast running and be its feature.

And, if to comprise above-mentioned affirmation result serves as that the wrong reason that takes place is the mistake that is caused by play signal, after the spindle speed that slows down, rerun the step of playing running, the mistake that is caused by above-mentioned play signal is to be its feature more than in the mistake that is caused by error-detecting code EDC or RF bias property any one.

Effect of the present invention:

Main shaft speed controlling method in the optical disc apparatus of the invention described above, for example, in DVD player optical disc apparatus such as (DVD-Player), if in broadcast exempts to shake the way of CD fatal playback error takes place, when confirming the playback error occurrence cause, if the occurrence cause of the playback error of above-mentioned affirmation is when focusing on shade (Focus Drop), after increasing spindle speed, rerun and play running, if the occurrence cause of the playback error of above-mentioned affirmation is because error-detecting code (EDC) or when playing wrong that RF deviation (Jitter) characteristic causes, after the spindle speed that slows down, rerun and play running, therefore, this is to make effectively normal operation have the very useful invention of broadcast running of exempting to shake CD of skew composition.

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.

Description of drawings

Fig. 1 illustrates the formation of general optical disc apparatus;

Fig. 2 illustrates the operation workflow synoptic diagram of generally exempting to shake the CD method for detecting;

Fig. 3 illustrates the operation workflow synoptic diagram of the main shaft speed controlling method in the optical disc apparatus of the present invention;

Fig. 4 illustrates the embodiment that increases spindle speed according to the present invention.

The symbol description of major part in the accompanying drawing:

10: CD 11: light picker

12:RF processor 13: digital signal processor

14: servo 15: microcomputer

16: motor driver 17: low-pass filter

The 18:A/D transducer

Embodiment

Below, the embodiment to the main shaft speed controlling method in the optical disc apparatus of the present invention is elaborated according to accompanying drawing.

At first, main shaft speed controlling method of the present invention with reference to Fig. 1, can be applied in the various optical disc apparatus of types such as aforesaid DVD player, and for example, as shown in Figure 3, Fig. 3 illustrates the operation workflow synoptic diagram of the main shaft speed controlling method in the optical disc apparatus of the present invention.

S20 in the microcomputer 15 of above-mentioned optical disc apparatus, with reference to Fig. 2, experiences aforesaid a series of process, inserts the interior CD 10 of device for exempting to shake CD even differentiate, and still keeps spindle speed, and running is play in operation under positive multiplying constant state.

S21 on the one hand, in above-mentioned microcomputer 15, judges in operation to play in the way that operates whether fatal playback error takes place.

S22 if fatal playback error takes place, plays under the state of running interim the termination, confirms the reason that its playback error takes place.

S23, whether for example, differentiating is the reason that focuses on shade (Focus Drop) mistake.

S24, the reason that takes place for playback error as above-mentioned affirmation result be the focus servo running interrupt suddenly focusing shade Focus Drop mistake the time, in above-mentioned microcomputer 15, above-mentioned servo 14 of running control, after increasing spindle speed, rerun and play running.

For example, as shown in Figure 4, in the outside field of CD 10, exist bending etc. to shift into the situation of exempting to vibrate CD of branch, spindle speed (Spindle Speed) is set at the situation that ' N ' multiple is rotated, having an effect towards the centrifugal force ' F ' of the prescribed level of CD lateral direction.

On the other hand, above-mentionedly exempt to vibrate in the way of CD playing, when causing playback error owing to the focusing shade, as shown in Figure 4, if spindle speed Spindle Speed is increased to ' N+1 ' multiple from ' N ' multiple, centrifugal force in the lateral direction effect of CD just is extended to ' F+1 ' from ' F ', focus servo running that on the contrary can security of operation, and operation is normal plays running.

S25, S26, in contrast, in above-mentioned microcomputer 15, the reason that takes place for playback error as above-mentioned affirmation result is by error-detecting code (EDC:Error Detection Code) or when playing wrong that the bias property etc. of RF signal causes, above-mentioned servo 14 of running control, after the spindle speed that slows down, rerun and play running.

Promptly, in above-mentioned microcomputer 15, if the reason of above-mentioned playback error is when focusing on shade, increase spindle speed, if by error-detecting code (EDC) or when playing wrong that the bias property etc. of RF signal causes, the spindle speed that slows down, after this, rerun and play running, normal operation exempts to shake the broadcast running of CD.

S27, S28, and, if in the way of the above-mentioned broadcast running of operation, apply for end of playing, after stopping playing running, the relevant arbitrarily running of operation user application.

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

1. the main shaft speed controlling method in the optical disc apparatus is characterized in that comprising:

The 1st step if make a mistake, is confirmed its wrong occurrence cause in broadcast exempts to shake the way of CD; And

The 2nd step if above-mentioned affirmation result is by focusing on the mistake that shade causes for the wrong reason that takes place, after increasing spindle speed, reruns and plays running.

2. the main shaft speed controlling method in the optical disc apparatus as claimed in claim 1 is characterized in that:

If above-mentioned affirmation result is the mistake that is caused by play signal for the wrong reason that takes place, after the spindle speed that slows down, reruns and play running.

3. as the main shaft speed controlling method in the claim 2 described optical disc apparatus, it is characterized in that:

The mistake that is caused by above-mentioned play signal is more than in the mistake that is caused by error-detecting code EDC or RF bias property any one.