CN1527313A - Rotation controlling method for light record medium - Google Patents

Abstract

The method of controlling the rotation of light record medium includes the following steps: feeding back the pulse the encoder generates to determine the present position of the light pick-up; finding out the distance between the initial position and the present position of the light pick-up; and dividing the found distance by the set linear speed and controlling the main shaft servo with the calculated value to alter the rotation speed of the light record medium. The present invention utilizes sliding motor to drive stepped encoder to produce pulse so as to find out the distance from the inside to the present position of the light pick-up and control the speed of the main shaft. The present invention has no need of reading PSN, no need of starting the servo and PLL, no need of decoding PSN, simple operation and correct control effect of the main shaft speed.

Description

The method of control optical recording media rotation

(1) technical field

The present invention relates to optical recording media record/Play System field, refers in particular in analog constant linear velocity (PSEUDO CLV:PCLV) pattern, utilizes sliding motor information, a kind of method of controlling the optical recording media rotation of control spindle motor speed.

(2) background technology

Lifting a general optical recording media is example, the mode of CD identifying recording layer, that is, the control mode of main shaft has: the rotational speed by CD changes with orbital position, in constant linear velocity (the CONSTANT LINEAR VELOCITY:CLV) mode of certain bit rate record data; Have nothing to do in orbital position, keep certain rotational speed from interior thoughtful most peripheral, and press Constant Angular Velocity (the CONSTANT ANGLE VELOCITY:CAV) mode of certain bit rate (BIT RATE) record data, this is widely known by the people.Also have in addition a kind ofly to be, take the mode of the simulation CLV (PCLV) of CLV in the above-mentioned control spindle motor mode and CAV strong point.

Above-mentioned CLV mode has: the parameter that can keep identical phase-locked loop PLL (PHASE LOCKEDLOOP) at whole CD, has outside the same advantage with the data recording density in interior week, but spindle controller depends on frequency generator FG (FREQUENCY GENERATION) and reads clock (READ CLOCK), therefore to meet with phase-locked loop PLL and just become complicated, again because of PLL needs very long reasons such as stand-by time, so there is (SEEK TIME) slow shortcoming start-up time.

In contrast, spindle controller only depends on frequency generator FG in the above-mentioned CAV mode, therefore simple, favourable raising speed, therefore fast strong point start-up time is arranged, but whole CD to be kept different PLL parameters, guarantee certain PLL edge, like this, just there is the outward little shortcoming of data recording density.

In addition, above-mentioned PCLV mode is basically with FG control, but with the rotating speed RPM (REVOLUTIONS PER MINUTE) of current per minute sevtor address (PHYSICAL SECTORNUMBER:PSN) change according to physics, promptly, in order to calculate above-mentioned RPM, read current PSN.But in order correctly to read current PSN, at first main shaft will be stablized.

In addition, also need a large amount of calculating even read PSN, in order to prevent this phenomenon, even utilize approximate method this moment, final result can not prevent the RPM error.

Fig. 1 is the figure for displaying sector difference that reads PSN and track difference relation.

Diagram among Fig. 1 with following mathematical expression 1 try to achieve current sector to the carrying out of the physics of target sector apart from ds*ls

[mathematical expression 1]

$l=\underset{A_0}{{@}^{2\mathrm{\π}*\mathrm{dN}+r}}\{\mathrm{Rc}+\frac{(z*\mathrm{lp})}{2\mathrm{\π}}\}\mathrm{dz}$

$=\mathrm{Rc}(2\mathrm{\π}*\mathrm{dN}+\mathrm{\γ})+{(2\mathrm{\π}*\mathrm{dN}+\mathrm{\γ})}^2*\frac{\mathrm{lp}}{4\mathrm{\π}}$

In addition, poor with the sector that following mathematical expression 2 is tried to achieve between current sector and the target sector,

[mathematical expression 2]

$\mathrm{dS}=\frac{\mathrm{Rc}(2\mathrm{\π}*\mathrm{dN}+\mathrm{\γ})+{(2\mathrm{\π}*\mathrm{dN}+\mathrm{\γ})}^2*\frac{\mathrm{lp}}{4\mathrm{\π}}}{\mathrm{ls}}$

In above-mentioned mathematical expression 1,2

Rc is the radius that is equivalent to present PBA,

Rt is the radius for the phase place 0 of the Rc that target P BA track is arranged,

γ is the phase differential (0≤γ＜360) of current sector and target sector,

Lp is track (0.74um during DVD-ROM),

The number of the track that dN is from Rc to Rt to be crossed (=| Rt-Rc|/lp),

Ls is the length of the physics of 1 sector,

Z is the integration parameter of expression angle.

That is, the data of present PSN and the radius R c on the current track are proportional.

So, know that PSN just can calculate radius, but the above-mentioned PSN that decodes just opens all servomechanisms and PLL.

With said process try to achieve the words of radius can be as following mathematical expression 3 with linear velocity V divided by radius R c, try to achieve RPM (W)

[mathematical expression 3]

w＝v/Rc

Try to achieve out RPM with above-mentioned mathematical expression 3, the speed of the RPM value change spindle motor that usefulness is tried to achieve promptly is the FG reference value.

But aforesaid existing PCLV mode is used PSN, for RPM is calculated successfully, requires a large amount of calculating, and the edge of PLL is high, even use method of approximation, error also can be many.

(3) summary of the invention

The present invention is in order to solve the above problems, and the purpose of this invention is to provide with the drive motor encoder pulse is that benchmark calculates RPM, shortens a kind of optical recording media method of controlling rotation in main shaft control time.

For reaching above-mentioned purpose, the method of control optical recording media rotation of the present invention is: use the drive stepping motor that scrambler is housed to transfer the slip of overall optical pick-up, with, a kind of optical recording media method of controlling rotation in the main axle servo device of control optical recording media rotational speed is included in, it comprises:

Acceptance is confirmed the step of current smooth take-off location from the pulse feedback that scrambler takes place; With

Ask from light and pick up the step of primary position to the distance of described current location; And

Divided by the linear velocity of setting, control above-mentioned main axle servo device with above-mentioned distance of trying to achieve, the step of change optical recording media rotational speed with its end value.

Above-mentioned light pick up primary position with, transfer above-mentioned light by the qualification switch that is positioned at all sides of above-mentioned optical recording media and pick up and try to achieve.

Effect of the present invention:

As above, method according to control optical recording media rotation of the present invention, utilize the information of sliding motor, particularly, utilize the encoder pulse of drive motor to try to achieve, control spindle speed, therefore need not read PSN for controlling above-mentioned spindle speed from the distance of interior thoughtful current light picker position, so computing is oversimplified, and the control spindle speed has and has more accurate effect.

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 for reading PSN, the sector difference of displaying and the figure of track difference relation in the prior art;

Fig. 2 is among the present invention, is the pie graph of the optical instrument of control optical recording media spinning solution.

(5) embodiment

Below, the formation and the effect thereof of the 2 explanation embodiment of the invention with reference to the accompanying drawings.

Illustrate on the figure and illustrated thus the present invention's formation and effect that this only is one embodiment of the present of invention, the invention described above technological thought and core formation thereof and effect can not be subjected to the restriction of this embodiment.

Fig. 2 shows among the present invention in order to control the optical instrument of optical recording media spinning solution.

Usually, know that the data of radius just need not also can be calculated the rotating speed RPM of per minute with reference to the sevtor address PSN of physics, slide and use stepper motor, can ask by the encoder pulse that calculates feedback from the distance of interior thoughtful current light picker to obtain.Among the present invention it is defined as the stepping indicator.

Then, the present invention utilizes the encoder pulse of stepper motor to obtain radius, without the speed of the control spindle motor of PSN decoding.

The overall optical pick-up is transferred in above-mentioned slip, and the sliding motor of slip has multiple, but the present invention is embodiment to use stepper motor.

In the above-mentioned stepper motor scrambler is housed, when driving above-mentioned stepper motor at above-mentioned scrambler pulsing FB.Microprocessor is accepted to calculate from the feedback of the pulse of above-mentioned scrambler generation in addition, just can know that the sliding motor stepping how much, also can know the position that light picker is general thus.

For example, when supposing stepper motor rotation 1 revolution, light picks up mobile 10um, and 10 encoder pulses take place, and when encoder pulse took place 50, therefore drive stepping motor rotation 5 revolutions can judge that light picker moves 50um.

So, know the position that light picker is current, just can try to achieve immediately interior week, that is, and the handover distance radius R from the light picker primary position to current light picker.

In addition, as above-mentioned mathematical expression 3, can get RPM to above-mentioned radius R divided by linear velocity V.The above-mentioned thus microprocessor speed of the RPM value change spindle motor of trying to achieve, that is, and frequency generator FG reference value.

Then, in the present invention, need not read current PSN for asking above-mentioned radius, servomechanism and PLL also need not open thus.

In addition, the resolution of above-mentioned stepping indicator is high more, can calculate RPM more accurately more.

During general CAV mode CD is decomposed into 6 to 8 circular forms, one of them is circular if the PLL edge covers, and the indication degree of resolution of stepping can be considered almost and do not change.

At this moment, might take place for the disengaging of drive motor and the problem of taking off groove, the current stepping indicator resolution situation different with the light picker position that calculates may take place in this moment.At this moment with reference to the PSN that reads at last, have to generate the PCLV method of driving, other method be detect again with interior week or periphery near the method for qualification switch.

In addition, above-mentioned qualification switch also can utilize to be asked on the light picker primary position, that is, when driving the record of optical recording media/Play System, at first, light picker touches and limits till the switch, and light picker unconditionally is transplanted on interior week.In addition, the set positions with this moment is the primary position that light picks up.

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 (4)

1, a kind of method of controlling the optical recording media rotation, be to use the drive stepping motor that scrambler is housed to transfer the slip of overall optical pick-up, with, a kind of control method of the optical recording media rotation in the main axle servo device of control optical recording media rotational speed is included in, its feature comprises:

The pulse feedback that acceptance sends from described scrambler is confirmed the step of the current location of light picker;

Obtain step from the primary position of light picker to described current location distance; And

Divided by the linear velocity of having set, control described main axle servo device with above-mentioned described distance of trying to achieve, the step of change optical recording media rotational speed with its end value.

2, the method for control optical recording media as claimed in claim 1 rotation is characterized in that described light picker primary position is that the qualification switch of the interior all sides by described optical recording media is transferred described light picker, tries to achieve.

3, the method for control optical recording media rotation as claimed in claim 1, the control of artificial line speed is carried out not simultaneously in the distance that it is characterized in that the described current light picker position of obtaining and light picker position with reference to the physical sector address PSN that reads at last.

4, the method for control optical recording media rotation as claimed in claim 1, the control of carrying out control artificial line speed PCLV is picked up toward transferring described light from interior week or the near qualification switch of periphery not simultaneously in the distance that it is characterized in that the described current light picker position of obtaining and light picker position.

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