CN1629945A - Automatic correction system for optical incident angle - Google Patents
Automatic correction system for optical incident angle Download PDFInfo
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- CN1629945A CN1629945A CN 200310120650 CN200310120650A CN1629945A CN 1629945 A CN1629945 A CN 1629945A CN 200310120650 CN200310120650 CN 200310120650 CN 200310120650 A CN200310120650 A CN 200310120650A CN 1629945 A CN1629945 A CN 1629945A
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Abstract
An optical incident angle automatic correction system used in an optical information registration/regeneration device includes a memory, a linear tilt angle computing unit, a controller and a tilt angle actuator. The memory stores a linear and a non-linear tilt angle compensation list, the computing unit inquires the list based on a first radius distance and a focus output voltage to compute the related compensation value, the non-linear computing unit can get the second radius distance of the disc beginning to generate non-linear deformation and get the related non-linear tilt angle compensation parameter, the controller computes the linear and non-linear compensation parameter based on a formula to make the actuator to modify the slant of the optical head.
Description
Technical field
The present invention relates to a kind of optics incident angle automatic correction system, be particularly related to a kind of optics incident angle automatic correction system that is used in the optical information recording/reproducing apparatus, in order to revise the degree of tilt of optical head in real time, make laser beam can remain in a predetermined optics incident angle and read data on the CD.
Background technology
Be in epoch of an information explosion today, along with the fast lifting of data bulk, information storage with handle relevant technology and also have thereupon and improve fast.The optical information storing technology then is a considerable ring in this correlative technology field.
In order to quicken the speed of information storage, and increase the quantity of information storage, the relevant technology evolution of optical information recording/reproducing apparatus is mainly towards accelerating CD speed, and adopts more short wavelength's laser beam, and this both direction develops.On the one hand CD speed doubles day by day, then is the laser beam technology on the other hand by CD specification (the about 780nm of wavelength) towards DVD specification (the about 650nm of wavelength) even more short wavelength's laser technology, for example blue laser (blue ray).For the development of this both direction, how to make the quality of optical information recorder/regeneration keep stable is the technical problem of desiring to overcome always.The technology of many servocontrol (servo control) is then arisen at the historic moment.
In known technology, the servo control technique that is applied to optical information recording/reproducing apparatus can be divided into Spindle Motor servo (spindle servo), focus servo (focus servo), circulation orbital servo (trackingservo) and rail searching servo (seek servo).The main function of these classification and various servo techniqueses is known by known skill person, and can be implemented in one is on the control core device chip with DSP.Correlation technique of the present invention is comparatively relevant with focus servo.Focus servo (focus servo) is to move on the direction of vertical CD in order to the control optical head, makes optical head and CD keep a focusing distance.In more detail, focus servo can receive focus error signal (the FE Signals that comes from CD reflection and return, FocusError signals), and export one and focus on output voltage (FOSO, or FOO) with the control optical head, optical head make focus error signal level off to zero, so that still can continue to remain focused on the appropriate location on the CD in the process that moves.Optical head can't have a variety of with the reason that CD remains on focusing distance, can be because CD itself and uneven, perhaps CD produces swing (wobble) or distortion in the process of rotation, in this case, optical head need move in vertical direction and just be able to keep focusing distance with CD.Yet the quickening with CD speed of reducing along with the laser beam wavelength only just makes optical head be not sufficient to keep the stabilizing quality of optical information recorder/regeneration automatically with CD maintenance focusing distance.
The factor that causes above-described known technology shortcoming it is generally acknowledged when focusing on the CD with laser beam that laser beam can not be relevant with the CD quadrature.The known optical information recording/reproducing apparatus possibly can't not included laser beam in consideration with the situation of CD quadrature in when design, only considers that CD produces swing (wobble) or distortion and causes the skew of focusing distance in the process of rotation.In other words,, can not guarantee that laser beam is orthogonal to CD, therefore can make that resulting signal quality is relatively poor though the technology of focus servo makes CD and optical head keep focusing distance.
See also Fig. 1, Fig. 1 is the synoptic diagram of known optical information recording/reproducing apparatus 10 and CD 14 relative position relations.Known optical information recording/reproducing apparatus 10 includes a wheelwork 12, an optical head track 16 and an optical head 18.Wheelwork 12, CD 14, optical head track 16 and optical head 18 can have the device of adjustable tilt degree respectively to adjust the degree of tilt of corresponding rotating shaft 22, disc axle 24, optical head axis of an orbit 26 and minute surface axle 28.For example, be example with wheelwork 12, can be provided with three degree of tilt on it and adjust screw 29.Proofread and correct improper or produce when crooked when rotating shaft 22, disc axle 24, optical head axis of an orbit 26 or minute surface axle 28, in the time of can causing a laser beam 30 incident CDs 14 that optical head 18 launched, can't produce the incident angle of quadrature (90 degree).
See also Fig. 1 and Fig. 2, Fig. 2 is laser beam 30 incident CDs 14 synoptic diagram of Fig. 1.Expression has CD 14 to comprise a plurality of different record blocks 32 among Fig. 2.As shown in Figure 1, optical information recording/reproducing apparatus 10 can be by known focus servo technology so that optical head 18 keeps a focusing distance w1 with CD 14, and cooperating known circulation orbital servo (tracking servo) technology, laser beam 30 can correctly focus on the specific record block 32 substantially.Yet as shown in Figure 2, known technology can't detect and adjust laser beam formed inclination angle [theta] 1 can not quadrature the time, and the influence that this shortcoming causes is the signal quality variation when optical information reads or write down.
Cause the reason of inclination angle [theta] 1, except rotating shaft shown in Figure 1 22, disc axle 24, optical head axis of an orbit 26 and minute surface axle 28 crooked, other has a common inclination angle origin cause of formation, is for CD 14 is not to be a normal flat panel, and is the CD of a warpage (tilt).
Rotating shaft 22, disc axle 24, optical head axis of an orbit 26 and the minute surface axle 28 crooked inclination angle [theta] that cause 1 are can't be along with the distance of record block 32 and CD 14 different and change to some extent is called linear inclination angle.
And the inclination angle that the warpage CD is caused is then different and different with the distance in CD 14 centers of circle because of the record block of institute's recording/reproducing, therefore is called non-linear inclination angle.Prolong by the center of circle and radially to begin to produce the warpage place and be that what is called produces the nonlinear deformation place.
At present existing minority proposes the research of solution at the incident angle problem of this laser beam and CD, yet mostly need be with the setting of an inclination angle detection device (tilt sensor), the inclination angle detection device is the crooked amount in order to detection laser light incident angle on CD, and testing result makes laser beam and CD be able to quadrature to adjust optical head by this.Yet being provided with of inclination angle detection device can increase cost, and therefore based on the consideration of cost, existing optical information regeneration/storage device has only minority to set up the inclination angle detection device.
Therefore, what known technology lacked is a kind of optics incident angle automatic correction system, and a kind of optics incident angle automatic correction system that does not comprise the inclination angle detection device, the cost factor when making optical information recording/reproducing apparatus to meet.
Summary of the invention
Fundamental purpose of the present invention provides a kind of optics incident angle automatic correction system that is used in the optical information recording/reproducing apparatus, in order to revise the degree of tilt of optical head in real time, make laser beam can remain in a predetermined optics incident angle and read information on the CD, to keep stablizing of optical information recorder/regeneration quality.
Another object of the present invention is to provide a kind of optics incident angle automatic correction system that does not comprise the inclination angle detection device, the cost consideration when making optical information recording/reproducing apparatus to meet.
The invention provides a kind of optics incident angle automatic correction system that is used in the optical information recording/reproducing apparatus.Above-mentioned optical information recording/reproducing apparatus comprises an optical head and an inclination angle actuator.Optical head can produce a laser beam reading the information on the record block that is positioned at one first radius distance on the CD, and receives a focusing output voltage (for example: this focusing output voltage can be provided by the focus servo that is positioned at controller) that comes from focus servo.An actuator then exportable inclination correction signal in inclination angle is revised the degree of tilt of optical head, makes laser beam can remain in a predetermined optics incident angle and reads information on the CD.
The optics incident angle automatic correction system comprises an internal memory, a linear inclination angle computing unit, a non-linear inclination angle computing unit and a controller.Internal memory is used for storing a linear pour angle compensation table and a non-linear pour angle compensation table.Linear pour angle compensation table is to form via a predetermined linear dip correction program organizational system, and includes several focusing output voltage and several corresponding linear pour angle compensation values.Non-linear pour angle compensation table then records several non-linear pour angle compensation parameters, and each non-linear pour angle compensation parameter then is the function that first radius distance and CD begin to produce one second radius distance of nonlinear deformation.Linear inclination angle computing unit is inquired about linear pour angle compensation table, and is calculated corresponding linear pour angle compensation value in order to according to first radius distance and focusing output voltage.Non-linear inclination angle computing unit can draw second radius distance that CD begins to produce nonlinear deformation according to a predetermined comparison program, then according to first radius distance and second radius distance, inquire about non-linear pour angle compensation table, and draw corresponding non-linear pour angle compensation parameter.Controller is to be used for controlling optical head, internal memory, linear inclination angle computing unit and non-linear inclination angle computing unit.Wherein, when optical head reads the data of the record block on the CD, the non-linear pour angle compensation parameter that linear pour angle compensation value that controller can calculate linear inclination angle computing unit and non-linear inclination angle computing unit draw, calculated via a pour angle compensation formula, and make the inclination angle actuator export corresponding inclination correction signal to optical head according to result of calculation, (on line) revises the degree of tilt of optical head with in real time.
Compared to known technology, optical information recording/reproducing apparatus of the present invention can not need be provided with the inclination angle detection device, and only by known usefulness so that optical head and CD focus on focusing output voltage that keeps a focusing distance and then the optics incident angle inclination angle that draws laser beam incident CD.Optics incident angle automatic correction system of the present invention is after calculating optics incident angle inclination angle, and degree of tilt that further can corresponding actuating optical head, so that laser beam is parallel to the normal direction of selected record block, and reach the purpose of optics incident angle from normal moveout correction.Therefore, utilize the optical information recording/reproducing apparatus of optics incident angle automatic correction system of the present invention not only can keep the stable of optical information recorder/regeneration quality, and meet the cost consideration when making optical information recording/reproducing apparatus.
Can be further understood by the following detailed description and accompanying drawings about the advantages and spirit of the present invention.
The accompanying drawing summary
Fig. 1 shows for known optical information recording/reproducing apparatus 10.
Fig. 2 is laser beam 30 incident CDs 14 synoptic diagram of Fig. 1.
Fig. 3 is according to optical information recording/reproducing apparatus 40 synoptic diagram of the present invention.
Fig. 4 A is that the angle of inclination of CD 50 is 0 synoptic diagram.
Fig. 4 B is that the angle of inclination of CD 50 is φ 1 synoptic diagram.
Fig. 4 C is that the angle of inclination of CD 50 is φ 2 synoptic diagram.
Fig. 5 is the pour angle compensation value organizational system flow chart of steps of linear pour angle compensation table 66 shown in Figure 3.
Fig. 6 is that optical information recording/reproducing apparatus 40 shown in Figure 3 uses a warpage CD 51 synoptic diagram.
Fig. 7 is the comparison program process flow diagram of the second radius distance r0 of generation Fig. 8.
The reference numeral explanation
10,40: optical information recording/reproducing apparatus 12,57: wheelwork
14,50: CD 16,43: optical head guide rails
18,42: optical head 22: rotating shaft
24: CD axle 26: the optical head axis of an orbit
29,59: degree of tilt is adjusted screw 28: the minute surface axle
30,48: laser beam 32,52: the record block
44: optics incident angle automatic correction system 45: the inclination angle actuator
49: digital analog converter 51: the warpage CD
53: result of calculation 54: focus on output voltage
55: reference position 56: the inclination correction signal
60: linear inclination angle computing unit 58: internal memory
62: non-linear inclination angle computing unit 64: controller
65: low-pass filter 66: linear pour angle compensation table
68: non-linear pour angle compensation table 70: linear pour angle compensation value
72: non-linear pour angle compensation parameter
Embodiment
The invention provides a kind of optics incident angle automatic correction system, be used in the optical information recording/reproducing apparatus.Optical information recording/reproducing apparatus of the present invention can give up need not be known inclination angle detection device (tilt sensor), and still can reach the optics incident angle of automatic calibrating optical head, make it remain on the quadrature positions of 90 degree substantially with CD.
See also Fig. 3, Fig. 3 is according to optical information recording/reproducing apparatus 40 synoptic diagram of the present invention.Optical information recording/reproducing apparatus 40 includes an optical head 42 (pick-up head), an optical head guide rails 43, an optics incident angle automatic correction system 44 and an inclination angle actuator 46 (tiltactuator).Optical head 42 can produce a laser beam 48 to read the data on the record block 52 (recording block) that is positioned at one first radius distance r on the CD 50, and the servo focusing output voltage 54 that produces corresponding to (in responsive to) this laser beam that reflects 48 of collectiong focusing (focus output voltage, FOSO).Actuator 46 exportable inclination correction signals 56 in inclination angle are revised the degree of tilt (inclination) of optical head 42, make laser beam 48 can remain in a predetermined optics incident angle and read data on the CD 50.
Optical head 42 comprises a laser diode (laser diode) with generation laser beam 48, and a photodetector (photo detector) is to detect the laser beam 48 that reflects on this record block.
Optical information recording/reproducing apparatus 40 comprises a wheelwork 57 (spindle) to be used for rotating disc 50.Wheelwork 57 is provided with at least one degree of tilt and adjusts screw; In the present embodiment, wheelwork 57 is provided with three degree of tilt and adjusts screw 59 (inclination adjusting screw).Degree of tilt is adjusted the degree of tilt of the rotating shaft 58 of the moving device 57 of screw 59 adjustable turn overs, and the horizontal tilt degree of related adjustment CD 50 when rotating; The function of these three degree of tilt adjustment screws 59 is similar to known degree of tilt adjustment screw 29 shown in Figure 1.
Optics incident angle automatic correction system 44 of the present invention comprises internal memory 58, one linear inclination angle computing unit, 60, one a non-linear inclination angle computing unit 62 and a controller 64.Internal memory 58 is to be used for storing a linear pour angle compensation table 66 (linear tilt compensation table) and a non-linear pour angle compensation table 68 (non-linear tilt compensation table).
Linear pour angle compensation table 66 is to form via a predetermined linear dip correction program organizational system (built), and includes several focusing output voltage and several corresponding linear pour angle compensation values (lineartilt digital-to-analog conversion values).Non-linear pour angle compensation table 68 item records a plurality of non-linear pour angle compensation parameters, and each non-linear pour angle compensation parameter then is the function that the first radius distance r and CD 50 begin to produce the second radius distance r0 of nonlinear deformation.
Linear inclination angle computing unit 60 is the focusing output voltages 54 that provided with according to first radius distance r and the focus servo, inquires about linear pour angle compensation table 66, and calculates corresponding linear pour angle compensation value 70.
Non-linear inclination angle computing unit 62 can draw the second radius distance r0 that CD 50 begins to produce nonlinear deformation according to a predetermined comparison program, then according to the first radius distance r and the second radius distance r0, inquire about non-linear pour angle compensation table 68, and draw corresponding non-linear pour angle compensation parameter 72.
Controller 64 is to be used for controlling optical head 42, internal memory 58, linear inclination angle computing unit 60 and non-linear inclination angle computing unit 62.
When optical head 42 reads the data of the record block 52 on the CD 50, the non-linear pour angle compensation parameter 72 that linear pour angle compensation value 70 that controller 64 can calculate linear inclination angle computing unit 60 and non-linear inclination angle computing unit 62 draw, calculated via a pour angle compensation formula, and make the corresponding inclination correction signal 56 of inclination angle actuator 46 output to optical head 42 according to result of calculation 53, to move at optical head and (for example :) during normal operation when optical head is just moving along the CD top when reading the data on the CD, (on line) revises the degree of tilt of optical head 42 in real time.With the present embodiment is example, and controller 64 can promptly be revised the degree of tilt of an optical head 42 at every 200ms to 500ms.
Controller 64 can draw result of calculation 53 with following pour angle compensation formula, and it is defined as Theta:
Theta＝bLinearTiltDAC+(bLinarTiltDAC-bTiltDAC_offset)+2*β(bLinarTiltDAC-bTiltDAC_offset)；
In the above-mentioned formula, the linear pour angle compensation value 70 that linear inclination angle computing unit 60 is calculated is defined as bLinearTiltDAC.The reference position 55 resultant linear pour angle compensation value defineds that optical head 42 reads CD 50 are bTiltDAC_offset.The non-linear pour angle compensation parameter 72 that non-linear inclination angle computing unit 62 draws is defined as β.
In the inclination angle actuator 46 and comprise a digital/analog converter 49 (D/A converter) and be converted to corresponding inclination correction signal 56, revise the degree of tilt of optical head 42 with result of calculation 53 with controller 64.The laser beam 48 that inclination angle actuator 46 can make optical head 42 be produced is parallel to the normal direction of selected record block 52, therefore make the optics incident angle remain in 90 degree substantially, so that reduce the error rate (error rate) of the data of reading and recording block 52.In the present embodiment, to revise the frequency of optical head 42 in real time be the degree of tilt that every 200ms to 500ms promptly revises an optical head 42 to controller 64.
Linear dip correction program in order to the linear pour angle compensation table 66 of organizational system is to utilize the flat panel of having verified of a standard (standard non-tilt disk) as mentioned above, so that linear dip correction program is not subjected to the nonlinear deformation that the warpage CD caused and the influence at non-linear inclination angle.The CD of this flat panel is positioned in the optical information recording/reproducing apparatus 40, and adjust this degree of tilt in the wheelwork 57 and adjust screw and the CD of this flat panel is in respectively under the situation of differing tilt angles rotate, and under each angle of inclination, write down corresponding focusing output voltage 54 and draw corresponding pour angle compensation value in different radii position part, to finish the organizational system of linear pour angle compensation table 66.
See also Fig. 4 A to Fig. 4 C, Fig. 4 A, Fig. 4 B and Fig. 4 C are respectively in the optical information recording/reproducing apparatus 40 shown in Figure 3, and the angle of inclination of CD 50 is 0, the synoptic diagram of φ 1 and φ 2.Below will be thus three figure with the organizational system method of the linear pour angle compensation table 66 of describing Fig. 3.The organizational system of linear pour angle compensation table 66 is chosen many more different angle on the implementation, and then the form of being built for meticulous and accurate, for convenience of explanation, is representative with this three figure only more herein.The degree of tilt of adjusting in the wheelwork 57 is adjusted screw 59, CD 50 is in respectively under the situation as differing tilt angles 0, φ 1 and the φ 2 of Fig. 4 A, Fig. 4 B and Fig. 4 C rotates.
Shown in Fig. 4 A, Fig. 4 B and Fig. 4 C, recording optical pickup 42 is in the different radii distance, and inner ring position r1, centre circle position r2 and position, outer ring receive respectively of r3 are carried out the pairing focusing output voltage 54 of filtering through a low-pass filter 65.Write down these 54 of output voltages of focusing and can draw linear pour angle compensation table 66.
See also Fig. 5, Fig. 5 is the pour angle compensation value organizational system flow chart of steps of linear pour angle compensation table 66 shown in Figure 3.In the optics incident angle automatic adjustment system of the present invention, the pour angle compensation value that linear pour angle compensation table 66 is write down can be drawn by the following step:
Step 500: beginning.
Step 502: a selected angle of inclination.
Step 504: import a preset range the different angle offset inclination correction signal 56 with as the fine setting, make optical head 42 be in corresponding degree of tilt.
Step 506: the data of reading and recording block 52 and calculate the error rate of reading of data in regular turn.
Step 508: choose a pour angle compensation value that makes this error rate minimum, to be recorded in the linear pour angle compensation table 66.
Step 510: judge whether linear pour angle compensation table has other angle of inclination not finish as yet, if, then get back to step 500, if not, then carry out step 512.
Step 512: finish.
That is to say that the method that draws these pour angle compensation values is to choose different angles of inclination, and repeating step 504 to 508, pour angle compensation values all in linear pour angle compensation table 66 are all finished record.
See also Fig. 1 and Fig. 2, generally result from the crooked of rotating shaft 22, disc axle 24, optical head axis of an orbit 26 and minute surface axle 28, and the inclination angle [theta] 1 of the optics incident angle that causes is to be linear inclination angle.By linear pour angle compensation table 66, optical information recording/reproducing apparatus 40 promptly has the ability at the linear inclination angle of handling these kinds.
Yet, about as the caused non-linear inclination angle of warpage CD, further need the non-linear pour angle compensation table 68 among organizational system Fig. 3, so that optical information recording/reproducing apparatus 40 utilizes controller 64 to adjust the calculating foundation to some extent of the degree of tilt of optical heads 42.
See also Fig. 6, Fig. 6 is that optical information recording/reproducing apparatus 40 shown in Figure 3 uses a warpage CD 51 synoptic diagram.The second radius distance r0 part begins to produce nonlinear deformation to warpage CD 51 in the distance center of circle.With as shown in Figure 6 r is example, is a linear inclination angle [theta] in the center of circle to the inclination angle of arbitrary radial location between the r0
2Inclination angle greater than arbitrary radial location r4 of r0 then is the linear inclination angle of a non-line.The present invention begins to produce the second radius distance r0 wherein to draw warpage CD 51, and cooperates the first radius distance r and linear inclination angle [theta]
2, draw non-linear pour angle compensation parameter beta with following formula:
And the organizational system of non-linear pour angle compensation table 68, can be at first fixing θ
2Situation under, change r and r0 to draw these non-linear pour angle compensation parameter beta.Then change θ
2, and repeat above-mentioned method to finish the non-linear pour angle compensation of organizational system table 68.
See also Fig. 3, Fig. 6 and Fig. 7.Fig. 7 is the comparison program process flow diagram of the second radius distance r0 of generation Fig. 6.The non-linear inclination angle computing unit 62 of Fig. 3 according to the predetermined comparison program of Fig. 7 to draw the second radius distance r0 that warpage CD 51 among Fig. 6 begins to produce nonlinear deformation.Should predetermined comparison program comprise the following step:
Step 700: beginning.
Step 702: utilize optical head 42 to read the data of the reference position 55 of CD inner ring, obtain corresponding focusing output voltage 54, and the first linear pour angle compensation value defined that will be calculated by linear inclination angle computing unit 60 this moment is bTiltDAC_offset.
Step 704: read the mode of CD 50 from inside to outside successively according to optical head 42, continue to read the data of CD 50, and obtain corresponding focusing output voltage in real time in each predetermined radial location.
Step 706: according to each radial location and resulting focusing output voltage, inquire about linear pour angle compensation table by linear inclination angle computing unit 60, with the present linear pour angle compensation value 70 that calculates.
Step 708: more present resulting linear pour angle compensation value 70 and this first linear pour angle compensation value.
Has step 710: whether the linear pour angle compensation value that newly obtains at present exceeded next average allowable range on this first linear pour angle compensation value? if then carry out step 712; If not, then carry out step 704.
Step 712: with present linear pour angle compensation value corresponding radial location order to producing the second radius distance r0 of nonlinear deformation.
Step 714: finish.By the organizational system of linear pour angle compensation table 66, so optics incident angle automatic correction system 44 can be according to focusing on output voltage 54, to calculate the optics incident angle inclination angle of laser beam 48 incident CDs 50 with non-linear pour angle compensation table 68.
Compared to known technology, optical information recording/reproducing apparatus 40 of the present invention need not be provided with the inclination angle detection device, and only by known usefulness so that optical head 42 focuses on focusing output voltage 54 that keeps a focusing distance and then the optics incident angle inclination angle that draws laser beam 48 incident CDs 50 with CD 50.Optics incident angle automatic correction system 44 of the present invention is after calculating optics incident angle inclination angle, and degree of tilt that further can corresponding actuating optical head 42, so that laser beam 48 is parallel to the normal direction of selected record block 52, and reach the purpose of optics incident angle from normal moveout correction.Therefore, utilize the optical information recording/reproducing apparatus of optics incident angle automatic correction system 44 of the present invention not only can keep the stable of optical information recorder/regeneration quality, and, therefore more can meet the cost consideration of optical information recording/reproducing apparatus owing to need not dispose expensive inclination angle detection device (tilt sensor).
By the above detailed description of preferred embodiments, be to wish to know more to describe feature of the present invention and spirit, and be not to come category of the present invention is limited with above-mentioned disclosed preferred embodiment.On the contrary, its objective is that hope can contain in the category of claim of being arranged in of various changes and tool equality institute of the present invention desire application.Therefore, the category of the claim that the present invention applied for should be done the broadest explanation according to above-mentioned explanation, contains the arrangement of all possible change and tool equality to cause it.
Claims (13)
1. optics incident angle automatic correction system, be used in the optical information recording/reproducing apparatus, this optical information recording/reproducing apparatus comprises an optical head and an inclination angle actuator, this optical head can produce a laser beam to read the data on the record block that is positioned at one first radius distance on the CD, and receive a focusing output voltage that produces corresponding to this laser beam that reflects, the then exportable inclination correction signal of this inclination angle actuator is revised the degree of tilt of this optical head, make this laser beam can remain in a predetermined optics incident angle and read data on this CD, this optics incident angle automatic correction system comprises: an internal memory, be used for storing a linear pour angle compensation table and a non-linear pour angle compensation table, this linearity pour angle compensation table is to form via a predetermined linear dip correction program organizational system, and include several and focus on output voltage and several corresponding linear pour angle compensation values, this non-linear pour angle compensation table then records several non-linear pour angle compensation parameters, and each non-linear pour angle compensation parameter then begins to produce the function of one second radius distance of nonlinear deformation for this first radius distance and this CD;
One linear inclination angle computing unit to focus on output voltage according to this first radius distance and this, is inquired about this linearity pour angle compensation table, and is calculated corresponding linear pour angle compensation value;
One non-linear inclination angle computing unit, can draw this second radius distance that this CD begins to produce nonlinear deformation according to a predetermined comparison program, then according to this first radius distance and this second radius distance, inquire about this non-linear pour angle compensation table, and draw corresponding non-linear pour angle compensation parameter; And
One controller is used for controlling this optical head, this internal memory, this linearity inclination angle computing unit and this non-linear inclination angle computing unit;
Wherein, when this optical head reads the data of the record block on this CD, the non-linear pour angle compensation parameter that this controller can draw the linear pour angle compensation value that should linearity inclination angle computing unit calculates and this non-linear inclination angle computing unit, calculated via a pour angle compensation formula, and make this inclination angle actuator export corresponding inclination correction signal to this optical head according to result of calculation, to revise the degree of tilt of this optical head in real time.
2. the system as claimed in claim 1, wherein, this optical head comprises a laser diode to produce this laser beam and a photodetector to detect the laser beam that reflects on this record block, in this inclination angle actuator and comprise a digital/analog converter and be converted to corresponding inclination correction signal, revise the degree of tilt of this optical head with result of calculation with this controller.
3. the system as claimed in claim 1, wherein, the laser beam that this inclination angle actuator can make this optical head produce is parallel to the normal direction of this selected record block, therefore make this predetermined optics incident angle remain in 90 degree substantially, so that reduce the error rate of the data that read this record block.
4. the system as claimed in claim 1, wherein, this optical information recording/reproducing apparatus comprises a wheelwork being used for rotating this CD, on this wheelwork and be provided with at least one degree of tilt and adjust screw, can be used to adjust the horizontal tilt degree of this CD when rotating.
5. system as claimed in claim 4, wherein, this linearity dip correction program is to utilize a normal flat panel to be positioned in this optical information recording/reproducing apparatus, and adjust this degree of tilt and adjust screw and this normal flat panel is in respectively under the situation of differing tilt angles rotate, and under each angle of inclination, write down corresponding focusing output voltage and draw corresponding pour angle compensation value in different radii position part, to finish the organizational system of this linearity pour angle compensation table.
6. system as claimed in claim 5, wherein, these pour angle compensation values that write down in this linearity pour angle compensation table can be drawn by the following step:
Under a given angle of inclination, the different angle offset of importing a preset range is with as fine setting, and makes this optical head be in corresponding degree of tilt;
Read the error rate of the data of this record block in regular turn, choose the pour angle compensation value that makes this error rate minimum, to be recorded in this linearity pour angle compensation table; And
Choose different angles of inclination, and repeat above-mentioned two steps, all pour angle compensation values are all finished record in this linearity pour angle compensation table.
7. the system as claimed in claim 1, wherein, the focusing output voltage that is write down in this linearity pour angle compensation table is when this optical head is positioned at an inner ring position, a centre circle position of this CD and position, an outer ring, the focusing output voltage that is received respectively, and this focusing output voltage be through a low-pass filter carry out after the filtering produce.
8. the system as claimed in claim 1, wherein, this comparison program is as follows:
Utilize this optical head to read the data of an initial position of this CD inner ring, and therefore obtain corresponding focusing output voltage, then calculate one first linear pour angle compensation value via this linearity inclination angle computing unit;
Read this CD from inside to outside successively with this optical head, and obtain corresponding focusing output voltage, and calculate corresponding linear pour angle compensation value in the different radii position via this linearity inclination angle computing unit in different radial location; And
The linear pour angle compensation value and this first linear pour angle compensation value that are calculated by linear inclination angle computing unit are at present compared, when the linear pour angle compensation value that newly obtains has at present exceeded on this first linear pour angle compensation value next average allowable range, this corresponding radial location is ordered to producing this second radius distance of nonlinear deformation.
9. system as claimed in claim 8, wherein, this first radius distance is defined as r, and this second radius distance is defined as r0, and the linear inclination angle of this CD is θ
2, this non-linear pour angle compensation parameter-definition is β and can be drawn by following formula:
Wherein, this non-linear pour angle compensation table can be at fixing θ
2Situation under, change r and r0, to draw these non-linear pour angle compensation parameter beta.
10. system as claimed in claim 9, wherein, the linear pour angle compensation value defined that this linearity inclination angle computing unit is calculated is bLinearTiltDAC, resulting this first linear pour angle compensation value defined of reference position that this optical head reads this CD is bTiltDAC_offset, the non-linear pour angle compensation parameter-definition that this non-linear inclination angle computing unit draws is β, and this controller can draw this result of calculation and be defined as Theta with following pour angle compensation formula:
Theta＝bLinearTiltDAC+(bLinarTiltDAC-bTiltDAC_offset)+2*β*(bLinarTiltDAC-bTiltDAC_offset)。
11. the system as claimed in claim 1, wherein, the every 200ms to 500ms of this controller promptly revises once the degree of tilt of this optical head.
12. the system as claimed in claim 1, wherein, when the present residing radial location of this optical head is not in this linearity pour angle compensation table during one of these predetermined radii positions, this controller can calculate corresponding pour angle compensation value in the mode of interpolation.
13. the system as claimed in claim 1, wherein, this optical information recording/reproducing apparatus does not comprise an inclination angle detection device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2003101206501A CN1321412C (en) | 2003-12-16 | 2003-12-16 | Automatic correction system for optical incident angle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2003101206501A CN1321412C (en) | 2003-12-16 | 2003-12-16 | Automatic correction system for optical incident angle |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1629945A true CN1629945A (en) | 2005-06-22 |
| CN1321412C CN1321412C (en) | 2007-06-13 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2003101206501A Expired - Fee Related CN1321412C (en) | 2003-12-16 | 2003-12-16 | Automatic correction system for optical incident angle |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101620873B (en) * | 2008-07-04 | 2012-07-04 | 株式会社日立制作所 | Optical disk apparatus and tilt control method thereof |
| CN103021427A (en) * | 2011-09-28 | 2013-04-03 | 广明光电股份有限公司 | Tilt offset correction method for actuator |
| CN113739703A (en) * | 2021-08-27 | 2021-12-03 | 浙江大学台州研究院 | Revolving body scanning measurement method and data compensation calibration method thereof |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2605776B2 (en) * | 1988-02-03 | 1997-04-30 | ヤマハ株式会社 | Tilt servo circuit for optical disc playback device |
| JP2866160B2 (en) * | 1990-07-19 | 1999-03-08 | パイオニア株式会社 | Optical disc player |
| JPH10302285A (en) * | 1997-04-23 | 1998-11-13 | Pioneer Electron Corp | Searching method |
| JP3520011B2 (en) * | 2000-01-11 | 2004-04-19 | 三洋電機株式会社 | Optical disc playback device |
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2003
- 2003-12-16 CN CNB2003101206501A patent/CN1321412C/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101620873B (en) * | 2008-07-04 | 2012-07-04 | 株式会社日立制作所 | Optical disk apparatus and tilt control method thereof |
| CN103021427A (en) * | 2011-09-28 | 2013-04-03 | 广明光电股份有限公司 | Tilt offset correction method for actuator |
| CN113739703A (en) * | 2021-08-27 | 2021-12-03 | 浙江大学台州研究院 | Revolving body scanning measurement method and data compensation calibration method thereof |
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| Publication number | Publication date |
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| CN1321412C (en) | 2007-06-13 |
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