CN100412960C - Method for controlling dip between optic axis of optical reading head and optical disc and apparatus thereof - Google Patents
Method for controlling dip between optic axis of optical reading head and optical disc and apparatus thereof Download PDFInfo
- Publication number
- CN100412960C CN100412960C CNB2004100576493A CN200410057649A CN100412960C CN 100412960 C CN100412960 C CN 100412960C CN B2004100576493 A CNB2004100576493 A CN B2004100576493A CN 200410057649 A CN200410057649 A CN 200410057649A CN 100412960 C CN100412960 C CN 100412960C
- Authority
- CN
- China
- Prior art keywords
- inclination angle
- tangent line
- read head
- trapezoidal wave
- discs
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Landscapes
- Optical Recording Or Reproduction (AREA)
Abstract
The present invention relates to method for controlling an inclination angle between an optical axis of an optical reading head and an optical disc and the device, which can be used for an optical drive. The method comprises the following steps that a trapezoidal wave signal comprising N unit time length in a radio frequency signal is received and comprises a lifting edge and a dropping edge; a slop sum can be calculated, and the amplitude or the time domain area of the trapezoidal wave signal are calculated, wherein the slope sum is the sum of the slope of the lifting edge and the dropping edge; a control parameter of an inclination angle of a tangent line can be generated according to the slope sum, and a control parameter of a radial inclination angle can be generated according to the amplitude or the time domain area of the trapezoidal wave signal; the optical drive can be controlled according to the control parameter of the inclination angle of the tangent line and the control parameter of the radial inclination angle so that the optical axis of the optical reading head can keep vertical correspondingly to an optical disc.
Description
Technical field
The invention relates to a kind of control method and device thereof of CD-ROM drive, and particularly relevant for a kind of optical axis of optical read head and the method and device thereof at the inclination angle between discs controlled.
Background technology
In recent years, flourish along with the multimedia industry, volume is little, capacity is big and stored data can be preserved optical storage media better also more of a specified duration, for example be CD, DVD etc., be used for storing video-audio data, Backup Data or the like widely.Because popularizing of discs, therefore feasible CD-ROM drive with access discs function is being played the part of important role on multimedia market.
See also Fig. 1, CD-ROM drive is to follow a specific direction 112 rotary CD sheets 106 and at discs radial direction 124 mobile optical read heads 104, utilize the record surface of 104 emitted laser scan light of optical read head disc 106 to come access data by Spindle Motor 102.Under desirable situation, when reading the data of discs 106,106 of the optical axis 122 of optical read head 104 and discs are can be orthogonal, and this moment, optical read head 104 was accurately the data read that is stored in the discs 106 to be come out; Please consult Fig. 2 A again, being projected to discs 106 record surfaces this moment has evenly and the energy distribution of concentrating in order to the laser spot 202 that reads disc record data 212.
Yet under the operational circumstances of reality, discs 106 is the optical axis 122 that can depart from optical read head 104 in the process of rotation, causes the optical axis 122 of optical read head 104 and 106 of discs not orthogonal.Thus, projecting laser on the discs 106 can make luminous point produce spherical aberration (spherical aberration), coma (coma), astigmatism (astigmatism), the curvature of field (fieldcurvature), distortion aberrations such as (distortion) and reduce optical quality, and then influence the electric signal quality, make the data read error rate strengthen.
In more detail, the inclination angle that both direction mainly can be resolved in the inclination angle that the optical axis 122 of optical read head 104 and discs are 106 is beneficial to analyze and calibration, and one is the inclination angle of radial direction 124 (or abbreviation is radially), and another is the inclination angle of tangential direction 126; Please consult Fig. 2 B again, wherein radially 124 inclination angle is departed from and is mainly caused the energy distribution inequality of laser spot 204 on radial direction 124 that is projected to discs 106 record surfaces, and please consult Fig. 2 C again, wherein the inclination angle of tangential direction 126 is departed from and is mainly caused the energy distribution inequality of laser spot 206 on tangential direction 126 that is projected to discs 106 record surfaces.
Therefore, researching and developing a kind of optical axis of optical read head and method at the inclination angle between discs controlled, so that the optical axis of optical read head can remain on optimized inclination angle with respect to discs, is very necessary.
Summary of the invention
In view of this, purpose of the present invention is exactly a kind of optical axis of optical read head and the method and device thereof at the inclination angle between discs controlled to be provided, to read quality with improvement.
According to purpose of the present invention, a kind of method of controlling the inclination angle is proposed, be used for a CD-ROM drive.CD-ROM drive comprises an optical read head, and the inclination angle is the optical axis of optical read head and the angle between discs.The method comprises the following steps.At first, receive the trapezoidal wave signal that one in a radio frequency (radio frequency) signal comprises N unit interval length, this trapezoidal wave signal comprises a rising edge and a falling edge.Then, calculate a slope and slope and be the slope sum of the slope and the falling edge of rising edge wherein.Then, according to slope and generation one tangent line inclination angle controlled variable.At last, according to tangent line inclination angle controlled variable control CD-ROM drive, so that the optical axis of optical read head remains in optimized inclination angle with respect to discs.
According to another object of the present invention, a kind of device of controlling the inclination angle is proposed, be used for a CD-ROM drive.CD-ROM drive comprises an optical read head, and the inclination angle is the optical axis of optical read head and the angle between a discs.This device comprises a signal receiving unit, a computing unit and a parameter generating unit.Signal receiving unit is in order to receive the trapezoidal wave signal that one in the radiofrequency signal comprises N unit interval length, and this trapezoidal wave signal comprises a rising edge and a falling edge.Computing unit in order to calculate a slope and, slope and be the slope sum of the slope and the falling edge of rising edge wherein.The parameter generating unit is according to slope and produces a tangent line inclination angle controlled variable that wherein tangent line inclination angle controlled variable is in order to the control inclination angle.
For above-mentioned purpose of the present invention, feature and advantage can be become apparent, a preferred embodiment cited below particularly, and cooperate appended graphicly, be described in detail below:
Description of drawings
Fig. 1 illustrates the relative position relation of optical read head and discs in the CD-ROM drive;
Fig. 2 A illustrates the laser spot synoptic diagram when aclinal departs between optical read head and discs;
Fig. 2 B illustrates the laser spot synoptic diagram when having the radial direction inclination angle to depart between optical read head and discs;
Fig. 2 C illustrates the laser spot synoptic diagram when having the tangential direction inclination angle to depart between optical read head and discs;
Fig. 3 illustrates a kind of optical axis of optical read head and the method flow diagram at the inclination angle between discs controlled according to a preferred embodiment of the present invention;
The synoptic diagram of pairing radiofrequency signal when Fig. 4 A illustrates the tangential different inclined at inclination angles of discs;
Fig. 4 B illustrates the graph of a relation according to the slope of the slope of the rising edge of the synchronized data signal in the radiofrequency signal of Fig. 4 A and falling edge and tangent line inclination angle;
Fig. 4 C illustrate according to the slope of the slope of the rising edge of Fig. 4 B and falling edge and with the graph of a relation at tangent line inclination angle;
Fig. 5 is the production method process flow diagram of tangent line inclination angle characteristic function;
The synoptic diagram of pairing radiofrequency signal when Fig. 6 A illustrates radially different inclined at inclination angles of discs;
Fig. 6 B illustrates according to the amplitude of the synchronized data signal in the radiofrequency signal of Fig. 6 A and the graph of a relation of radial rake;
Fig. 6 C illustrates according to the time domain area of the synchronized data signal in the radiofrequency signal of Fig. 6 A and the graph of a relation of radial rake;
Fig. 7 is the production method process flow diagram of the first radial rake characteristic function;
Fig. 8 illustrates a kind of optical axis of optical read head and the device calcspar at the inclination angle between discs controlled according to a preferred embodiment of the present invention.
Embodiment
Please refer to Fig. 3, it illustrates a kind of optical axis of optical read head and the method flow diagram at the inclination angle between discs controlled according to a preferred embodiment of the present invention.This method is to use in a CD-ROM drive.At first, receive the trapezoidal wave signal that one in the discs radiofrequency signal comprises N unit interval length, this trapezoidal wave signal comprises a rising edge and a falling edge, in this preferred embodiment, can utilize the fixed signal length that synchronized data signal had that meets DVD specification or CD specification, come the required trapezoidal wave signal of optical axis and the inclination angle between discs, shown in step 310 as the detection optical read head.The synchronized data signal that wherein meets the DVD specification comprises the trapezoidal wave signal of 14 unit interval length, and comprises a rising edge and a falling edge.
Then, the slope of the rising edge of calculating synchronized data signal and the slope sum of falling edge, and calculate the amplitude of synchronized data signal or the time domain area of synchronized data signal, shown in step 320.Wherein, the time domain area of synchronized data signal for example is by by synchronized data signal is tried to achieve at the time domain integration.As shown in Fig. 2 C, the inclination angle of tangential direction 126 is departed from and is mainly caused the energy distribution inequality of laser spot 206 on tangential direction 126 that is projected to discs 106 record surfaces, and then make radiofrequency signal time domain response (time domainresponse) in the time different by rising edge and falling edge, so tranmittance can obtain the information relevant with the inclination angle of tangential direction 126 to the rising edge slope of trapezoidal wave signal with the falling edge slope, angle at tangential direction inclination angle etc. for example, in this preferred embodiment, comparison rising edge slope of trapezoidal wave signal and falling edge slope be with its slope and mode produce.Please consult Fig. 2 B and Fig. 2 C again, depart from any direction inclination angle can both cause laser spot energy distribution inequality, and then its amplitude of radiofrequency signal or the time domain area of trapezoidal wave signal are changed to some extent.
Then, according to the predetermined tangent line inclination angle characteristic function of slope and inquiry or according to the tangent line inclination angle form of tangent line inclination angle characteristic function gained with decision tangent line inclination angle controlled variable, and inquire about the first predetermined radial rake characteristic function according to the amplitude of synchronized data signal or according to the first radial rake form of the first radial rake characteristic function gained, or inquire about the second predetermined radial rake characteristic function according to the time domain area of synchronized data signal or according to the second radial rake form of the second radial rake characteristic function gained with decision radial rake controlled variable, shown in step 330.
Tangent line inclination angle characteristic function, tangent line inclination angle form, the first radial rake characteristic function, the first radial rake form, the second radial rake characteristic function, and the second radial rake form be in the preceding setting of dispatching from the factory, or design when the back user of dispatching from the factory carries out calibration actions and try to achieve.Wherein tangent line inclination angle characteristic function and tangent line inclination angle form in order to the inquiry slope and with the corresponding relation of tangent line inclination angle controlled variable, the first radial rake characteristic function and the first radial rake form are in order to the amplitude of inquiry synchronized data signal and the corresponding relation of radial rake controlled variable, and the second radial rake characteristic function and the second radial rake form then are in order to the time domain area of inquiry synchronized data signal and the corresponding relation of radial rake controlled variable.After the method for generation tangent line inclination angle characteristic function, tangent line inclination angle form, the first radial rake characteristic function, the first radial rake form, the second radial rake characteristic function or the second radial rake form will be specified in.
At last, according to tangent line inclination angle controlled variable that is determined and radial rake controlled variable control CD-ROM drive, for example see through control optical read head 104 or other actuator relevant with the inclination angle adjustment, so that the optical axis 122 of optical read head can remain on preferable inclination angle with respect to discs 106, the optical axis that for example is optical read head keeps vertical with respect to discs, shown in step 340.
Method can recurrence be carried out as shown in Figure 3, in the hope of preferable tangent line inclination angle controlled variable and radial rake controlled variable; In addition, can also when capable step 330 of each receipt and step 340, only determine tangent line inclination angle controlled variable or radial rake controlled variable then alternately to determine tangent line inclination angle controlled variable and radial rake controlled variable with recursive fashion again.
The production method of tangent line inclination angle characteristic function will be described again.Please refer to Fig. 4 A, it illustrates the synoptic diagram of pairing radiofrequency signal when being the tangential different inclined at inclination angles of discs.In time T 1, synchronized data signal A, B, C, D and the E among radiofrequency signal RFa, RFb, RFc, RFd and the RFe be correspond to respectively discs tangentially tilt 0 the degree, 0.2 the degree, 0.4 the degree, 0.6 the degree and 0.8 the degree.Each synchronized data signal A～E comprises a rising edge (rising edge) RE and a falling edge (falling edge) FE.The slope of each rising edge RE is opposite with the positive negative value of the slope of each falling edge FE.
Find that through experiment when discs tangentially tilted, the absolute value of the slope of the rising edge of its pairing synchronized data signal and the slope of falling edge was unequal.In order to be illustrated more clearly in this phenomenon, please refer to Fig. 4 B, it illustrates is slope and the slope of falling edge and the graph of a relation at tangent line inclination angle according to the rising edge of the synchronized data signal in the radiofrequency signal of Fig. 4 A.In Fig. 4 B, transverse axis is slope (Slop), and the longitudinal axis is tangent line inclination angle (Ta), and the cruciform symbol is the slope of each rising edge RE among the presentation graphs 4A, and triangle symbol is the slope of each falling edge FE among the presentation graphs 4A.Can clearly be seen that by Fig. 4 B for same tangent line inclination angle Ta, the absolute value of the slope of the slope of its pairing rising edge RE and falling edge FE is unequal.
In addition, if with the tangent line inclination angle be 0 the degree as control group, and the slope of the slope of the different pairing rising edge RE in tangent line inclination angle among the calculating chart 4B and falling edge FE with, then can be depicted as the graph of a relation shown in Fig. 4 C.In Fig. 4 C, transverse axis is tangent line inclination angle (Ta), and the longitudinal axis is a slope and (Ss).Can clearly be seen that by Fig. 4 C, tangent line inclination angle and slope and between exist certain funtcional relationship, people claim that this funtcional relationship is a tangent line inclination angle characteristic function, and when the tangent line inclination angle is big more, its pairing slope and also big more.Therefore, according to the slope of the slope of the rising edge of synchronized data signal and falling edge and can learn that discs is with respect to the tangential inclined degree of optical read head.
Fig. 5 is the production method process flow diagram of tangent line inclination angle characteristic function.At first, change different tangent lines inclination angle, and calculate each tangent line inclination angle controlled variable desired value accordingly, shown in step 510.Then, respectively according to this a little tangent lines inclination angle controlled variable desired value control CD-ROM drive, so that a little for this reason respectively tangent line inclination angles in the optical axis of optical read head and the inclination angle between discs, shown in step 520, and receive a plurality of synchronized data signal end values in the radiofrequency signal end value of optical read head output respectively accordingly, each synchronized data signal end value comprises a rising edge and a falling edge, shown in step 530.Then, calculate a plurality of slopes and end value, these a little slopes and end value be the slope of rising edge of these a little synchronized data signal end values and falling edge slope and, shown in step 540.Then, according to this a little tangent lines inclination angle controlled variable desired value and pairing these a little slopes and end value generation tangent line inclination angle characteristic function, shown in step 550, can also produce tangent line inclination angle form according to tangent line inclination angle characteristic function in addition, to simplify the CD player running calculation process in period.
The production method of the first radial rake characteristic function and the second radial rake characteristic function then will be described.Please refer to Fig. 6 A, it illustrates the synoptic diagram of pairing radiofrequency signal when being radially different inclined at inclination angles of discs.In time T 2, synchronized data signal G, H, I, J and the K among radiofrequency signal RFg, RFh, RFi, RFj and the RFk be correspond to respectively discs radially tilt 0 the degree, 0.2 the degree, 0.4 the degree, 0.6 the degree and 0.8 the degree.Wherein, when discs 0 degree that tangentially tilts, and radially tilt 0 when spending, the optical axis of optical read head is perpendicular to discs.
Find that through experiment when discs radially tilts, exist certain funtcional relationship between the amplitude of its pairing synchronized data signal and radial rake, people claim this funtcional relationship first radial rake characteristic function.In order to be illustrated more clearly in this phenomenon, please refer to Fig. 6 B, it illustrates is according to the amplitude of the synchronized data signal in the radiofrequency signal of Fig. 6 A and the graph of a relation of radial rake.In Fig. 6 B, transverse axis is radial rake (Ra), and the longitudinal axis is the amplitude (Amp) of synchronized data signal.Can clearly be seen that by Fig. 6 B when radial rake was big more, the amplitude of its pairing synchronized data signal was more little.Therefore, can learn that according to the amplitude of synchronized data signal discs is with respect to optical read head inclined degree radially.
In addition, when discs radially tilts, also exist certain funtcional relationship between the time domain area of its pairing synchronized data signal and radial rake, people claim that this funtcional relationship is the second radial rake characteristic function.Please refer to Fig. 6 C, it illustrates is according to the time domain area of the synchronized data signal in the radiofrequency signal of Fig. 6 A and the graph of a relation of radial rake.The time domain area of synchronized data signal for example is that the time domain integration of this synchronized data signal is tried to achieve.In Fig. 6 C, transverse axis is radial rake (Ra), and the longitudinal axis is the area (Area) of synchronized data signal to time domain integration gained.Can clearly be seen that by Fig. 6 C when radial rake was big more, the time domain integral area of its pairing synchronized data signal was more little.Therefore, can also learn that according to the area of synchronized data signal discs is with respect to optical read head inclined degree radially.
That is to say, when discs radially tilts, between the amplitude and radial rake of its pairing synchronized data signal, with and the time domain area of pairing synchronized data signal and radial rake between all exist certain funtcional relationship.Therefore, can learn that according to the amplitude of synchronized data signal or according to the time domain area of synchronized data signal discs is with respect to optical read head inclined degree radially no matter be.
Fig. 7 is the production method process flow diagram of the first radial rake characteristic function.At first, determine different a plurality of radial rakes, and determine a plurality of radial rake controlled variable desired values accordingly, shown in step 710.Then, respectively according to these a little radial rake controlled variable desired value control CD-ROM drives, so that a little for this reason respectively radial rakes of the optical axis of optical read head and the angle between discs, shown in step 720, and receive a plurality of synchronized data signal end values in the radiofrequency signal end value of optical read head output respectively accordingly, shown in step 730.Then, calculate the amplitude of each synchronized data signal end value, shown in step 740.Then, amplitude according to these a little radial rake controlled variable desired values and pairing these a little synchronized data signal end values thereof produces the first radial rake characteristic function, shown in step 750, in addition, can also produce the first radial rake form according to the first radial rake characteristic function, to simplify the CD player running calculation process in period.
The second radial rake characteristic function and the second radial rake form are the time domain area of expression synchronized data signal and the corresponding relation of radial rake controlled variable, the method of its generation is similar to the first radial rake form to the first above-mentioned radial rake characteristic function, is no longer given unnecessary details at this.
The tangent line inclination angle characteristic function that produces according to said method have slope and with the corresponding relation of tangent line inclination angle controlled variable, therefore according to slope with can check in tangent line inclination angle controlled variable according to this.In addition, the first radial rake characteristic function and the second radial rake characteristic function that produce according to above-mentioned method are amplitude and the time domain area of radial rake controlled variable and synchronized data signal and the corresponding relations of radial rake controlled variable that has synchronized data signal respectively, therefore can check in the radial rake controlled variable according to this according to the amplitude of synchronized data signal or the time domain area of synchronized data signal.Tangent line inclination angle characteristic function, the first radial rake characteristic function and the second radial rake characteristic function that produces according to said method be when in dispatching from the factory before, carrying out the CD-ROM drive calibration enforcement and be recorded in the CD-ROM drive, in addition, still can design and implement when carrying out calibration actions in the back user of dispatching from the factory, or signal quality implements when inferior in real time when optical read head reads, and can keep vertical with the optical axis that makes optical read head with respect to discs.
Fig. 8 illustrates a kind of optical axis of optical read head and the device calcspar at the inclination angle between discs controlled according to a preferred embodiment of the present invention.This device 800 comprises signal receiving unit 810, computing unit 820 and parameter generating unit 830, and by inclination control unit 840 control optical head 104 or other actuators relevant with the inclination angle adjustment.Signal receiving unit 810 is in order to the synchronized data signal SD in the received RF signal, and synchronized data signal SD comprises a rising edge and a falling edge.Computing unit 820 is according to the amplitude A mp of synchronized data signal SD slope calculations and Ss and synchronized data signal SD or the synchronized data signal SD area A rea to time domain integration gained.Slope and Ss be the slope of rising edge of synchronized data signal SD and falling edge slope and.
The optical axis of the disclosed control optical read head of the above embodiment of the present invention and the method and the device thereof at the inclination angle between discs, can make discs in the process of rotation, still can keep vertical with respect to optical read head, form optical phenomenas such as spherical aberration, coma, astigmatism, the curvature of field, distortion with the laser spot of avoiding projecting on the discs, thereby promote the quality that reads.
In sum; though the present invention discloses as above with a preferred embodiment; right its is not in order to limit the present invention; anyly have the knack of this skill person; without departing from the spirit and scope of the present invention; when can being used for a variety of modifications and variations, so protection scope of the present invention is as the criterion when looking accompanying the claim person of defining.
Claims (9)
1. control the optical axis of optical read head and the method at the inclination angle between discs for one kind, be used for a CD-ROM drive, this CD-ROM drive comprises an optical read head, and this inclination angle is the optical axis of this optical read head and the angle between a discs, it is characterized in that this method comprises:
Receive the trapezoidal wave signal in the radiofrequency signal, this trapezoidal wave signal comprises a rising edge and a falling edge;
Calculate a slope and, this slope and be this rising edge slope and this falling edge slope with;
According to a tangent line inclination angle characteristic function, in this slope and this function of substitution, to produce a tangent line inclination angle controlled variable; And
Control this CD-ROM drive according to this tangent line inclination angle controlled variable, so that the optical axis of this optical read head remains in optimized inclination angle with respect to this discs.
2. the method for claim 1 is characterized in that, the generation step of described this tangent line inclination angle characteristic function comprises:
Determine different a plurality of tangent lines inclination angles, and determine a plurality of tangent lines inclination angle controlled variable desired value accordingly;
Control this CD-ROM drive according to many tangent line inclination angles of The controlled variable desired value respectively, so that the angle between the optical axis of this optical read head and this discs is respectively many tangent line inclination angles of The, and receive a plurality of trapezoidal wave signal end values in the radiofrequency signal end value of this optical read head output accordingly respectively, respectively this trapezoidal wave signal end value comprises a rising edge and a falling edge;
A calculated complex slope and end value, many slopes of The and end value be the slope of this rising edge of many trapezoidal wave signal end values of The and this falling edge slope and; And
Produce this tangent line inclination angle characteristic function according to many tangent line inclination angles of The controlled variable desired value and many slopes of pairing The thereof and end value.
3. the method for claim 1 is characterized in that, described this trapezoidal wave signal is a synchrodata signal that meets the DVD specification.
4. control the optical axis of optical read head and the method at the inclination angle between discs for one kind, be used for a CD-ROM drive, this CD-ROM drive comprises an optical read head, and this inclination angle is the optical axis of this optical read head and the angle between a discs, it is characterized in that this method comprises:
Receive the trapezoidal wave signal in the radiofrequency signal, this trapezoidal wave signal comprises a rising edge and a falling edge;
Calculate a time domain area of this trapezoidal wave signal;
According to the funtcional relationship of a tangent line inclination angle characteristic and time domain area, in this this function of time domain area substitution, to produce a tangent line inclination angle controlled variable; And
Control this CD-ROM drive according to this tangent line inclination angle controlled variable, so that the optical axis of this optical read head remains in optimized inclination angle with respect to this discs.
5. method as claimed in claim 4, the function of this tangent line inclination angle characteristic and time domain area wherein, it produces step and comprises:
Determine a plurality of radial rakes, and determine a plurality of radial rake controlled variable desired values accordingly;
Control this CD-ROM drive according to many radial rake controlled variable of The desired value respectively, so that the angle between the optical axis of this optical read head and this discs is respectively many radial rakes of The, and receive a plurality of trapezoidal wave signal end values in the radiofrequency signal end value of this optical read head output accordingly respectively;
Calculate the respectively time domain area of this trapezoidal wave signal end value; And
Produce the function of this tangent line inclination angle characteristic and time domain area according to the time domain area of The many radial rake controlled variable desired value and many trapezoidal wave signal end values of pairing The thereof.
6. control the optical axis of optical read head and the method at the inclination angle between discs for one kind, be used for a CD-ROM drive, this CD-ROM drive comprises an optical read head, and this inclination angle is the optical axis of this optical read head and the angle between a discs, it is characterized in that this method comprises:
Receive the trapezoidal wave signal in the radiofrequency signal, this trapezoidal wave signal comprises a rising edge and a falling edge;
Calculate the amplitude of this trapezoidal wave signal;
According to the funtcional relationship of a tangent line inclination angle characteristic and trapezoidal wave signal amplitude, in this this function of time domain area substitution, to produce a tangent line inclination angle controlled variable; And
Control this CD-ROM drive according to this tangent line inclination angle controlled variable, so that the optical axis of this optical read head remains in optimized inclination angle with respect to this discs.
7. method as claimed in claim 6, the function of this tangent line inclination angle characteristic and trapezoidal wave signal amplitude wherein, it produces step and comprises:
Determine a plurality of radial rakes, and determine a plurality of radial rake controlled variable desired values accordingly;
Control this CD-ROM drive according to many radial rake controlled variable of The desired value respectively, so that the angle between the optical axis of this optical read head and this discs is respectively many radial rakes of The, and receive a plurality of trapezoidal wave signal end values in the radiofrequency signal end value of this optical read head output accordingly respectively;
Calculate the respectively amplitude of this trapezoidal wave signal end value; And
Produce the function of this tangent line inclination angle characteristic and trapezoidal wave amplitude according to the amplitude of The many radial rake controlled variable desired value and many trapezoidal wave signal end values of pairing The thereof.
8. control the optical axis of optical read head and the device at the inclination angle between discs for one kind, be used for a CD-ROM drive, this CD-ROM drive comprises an optical read head, and this inclination angle is the optical axis of this optical read head and the angle between a discs, it is characterized in that this device comprises:
One signal receiving unit, in order to receive the trapezoidal wave signal in the radiofrequency signal, this trapezoidal wave signal comprises a rising edge and a falling edge;
One computing unit, in order to calculate a slope and, this slope and be this rising edge slope and this falling edge slope with; And
One parameter generating unit produces a tangent line inclination angle controlled variable according to this slope with inquiry one tangent line inclination angle characteristic function, and this tangent line inclination angle controlled variable is in order to control this inclination angle;
One inclination control unit is controlled this CD-ROM drive according to this tangent line inclination angle controlled variable, so that the optical axis of this optical read head remains in optimized inclination angle with respect to this discs.
9. device as claimed in claim 8 is characterized in that, described this parameter generating unit is to determine this tangent line inclination angle controlled variable according to this slope with inquiry one tangent line inclination angle characteristic function.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100576493A CN100412960C (en) | 2004-08-23 | 2004-08-23 | Method for controlling dip between optic axis of optical reading head and optical disc and apparatus thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100576493A CN100412960C (en) | 2004-08-23 | 2004-08-23 | Method for controlling dip between optic axis of optical reading head and optical disc and apparatus thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1741148A CN1741148A (en) | 2006-03-01 |
| CN100412960C true CN100412960C (en) | 2008-08-20 |
Family
ID=36093492
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2004100576493A Expired - Fee Related CN100412960C (en) | 2004-08-23 | 2004-08-23 | Method for controlling dip between optic axis of optical reading head and optical disc and apparatus thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100412960C (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2002027715A1 (en) * | 2000-09-26 | 2002-04-04 | Matsushita Electric Industrial Co., Ltd. | Optical system for optical disk, optical head unit for optical disk, and optical drive unit |
| WO2003105143A1 (en) * | 2002-06-06 | 2003-12-18 | 松下電器産業株式会社 | Inclination detector, optical head, optical information processor computer, video recorder, video reproducer, and car navigation system |
| CN1162846C (en) * | 2000-09-01 | 2004-08-18 | 三星电机株式会社 | Radial-inclined detector |
-
2004
- 2004-08-23 CN CNB2004100576493A patent/CN100412960C/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1162846C (en) * | 2000-09-01 | 2004-08-18 | 三星电机株式会社 | Radial-inclined detector |
| WO2002027715A1 (en) * | 2000-09-26 | 2002-04-04 | Matsushita Electric Industrial Co., Ltd. | Optical system for optical disk, optical head unit for optical disk, and optical drive unit |
| WO2003105143A1 (en) * | 2002-06-06 | 2003-12-18 | 松下電器産業株式会社 | Inclination detector, optical head, optical information processor computer, video recorder, video reproducer, and car navigation system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1741148A (en) | 2006-03-01 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US6519213B1 (en) | Method and apparatus for reading data from a disk | |
| JP2003168216A (en) | Optical recording medium, and device and method for recording on the same | |
| JP2004095184A5 (en) | ||
| WO2002082433A1 (en) | Optical disc apparatus | |
| CN100412960C (en) | Method for controlling dip between optic axis of optical reading head and optical disc and apparatus thereof | |
| JPH11185259A (en) | Optical disk device | |
| JP2003257053A (en) | Optical storage device and method for deciding optimum focus offset value thereof | |
| US7492684B2 (en) | Method and apparatus for controlling a tilt between an optical axis of an optical pick-up head and an optical disc | |
| JP2010123205A (en) | Reproduction apparatus and reproduction method | |
| US20050201224A1 (en) | Method of inter-layer search in a disk drive | |
| JPH09147391A (en) | Optical disk reproducing device and servo control optimizing method for optical disk reproducing device | |
| JPWO2008149557A1 (en) | Optical disc apparatus and lens tilt control method | |
| KR100480624B1 (en) | Method for measuring the amount of unbalance of disc weight and apparatus thereof | |
| JP3530609B2 (en) | Disk unit | |
| JP2000222747A (en) | Optical disk device and servo parameter adjusting device | |
| US7072263B2 (en) | Optical disc recording and playback apparatus | |
| US7218587B2 (en) | Method for determining writing power of data recording devices | |
| US6829204B2 (en) | Method of controlling a rotational rate of an optical disc and optical disc recording device using the same | |
| JP3440574B2 (en) | Optical disk drive | |
| JP3546535B2 (en) | Optical disk drive | |
| JP2010518537A (en) | Focus offset recording system and focus offset recording method | |
| JPH1125473A (en) | Optical disk device and optical axis correcting method | |
| US8050159B2 (en) | Method of recording data on optical disc and optical disc apparatus | |
| US20100202258A1 (en) | Optical Disk Drive and Operation Method Thereof | |
| JP2003085772A (en) | Information recording medium |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20080820 Termination date: 20130823 |