CN1607580A - Optical medium determination method - Google Patents
Optical medium determination method Download PDFInfo
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- CN1607580A CN1607580A CN 200310100688 CN200310100688A CN1607580A CN 1607580 A CN1607580 A CN 1607580A CN 200310100688 CN200310100688 CN 200310100688 CN 200310100688 A CN200310100688 A CN 200310100688A CN 1607580 A CN1607580 A CN 1607580A
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- 230000003287 optical effect Effects 0.000 title claims abstract description 43
- 238000000034 method Methods 0.000 title claims abstract description 27
- 230000000630 rising effect Effects 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 44
- 230000010287 polarization Effects 0.000 description 4
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- 238000005259 measurement Methods 0.000 description 2
- 230000011514 reflex Effects 0.000 description 1
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Abstract
An optical media judgment method is that utilizing a mobile target lens to get the data of a pulse beam reflection focused on a disc plastic layer and a driving circuit outputs a rising DC voltage of voltage difference using said reflection volume, a driving actuator drives the target lens to move to a suitable place where the disc can be discriminated but can't be touched.
Description
Technical field
The present invention relates to a kind of optical medium determination methods, refer to that especially a kind of object lens collision disc that can prevent to cause maybe can't declare the method for dish when disc has warping phenomenon.
Background technology
As shown in Figure 1, read the synoptic diagram of a disc 20 for optical head and associated component thereof in the known CD-ROM drive.This optical head comprises a laser diode 10, it launches the laser beam of a specific wavelength, this light beam through one the polarization optical splitter 11 after, by point instrumentation lens 12 it is converged parallel beam, parallel beam will be originally for the linearly polarized light beam becomes Circular Polarisation through a quarter-wave plate 13, and the Circular Polarisation light beam forms a focal spot SP on disc after via the focusing of object lens 14.One drive circuit 30 drives an actuator 32, moves by prolonging the optical axis fore-and-aft direction to control these object lens 14, and changes focal spot SP position, and focal spot SP can be focused on the data Layer of disc.Focal spot SP oppositely via behind object lens 14, the quarter-wave plate 13, is become linear polarization by original Circular Polarisation by the reflected light of disc data layer, arrives polarization optical splitter 11 via point instrumentation lens 12 again.This moment, folded light beam was because linear polarization direction and original light beam polarised direction were vertical, therefore can be reflected to behind the condenser lens 15 again by a device for testing light 16 receptions.
Figure 2 shows that the volume reflection synoptic diagram when known technology is normally declared dish, its transverse axis express time, the longitudinal axis are represented reflected signal, record a reflected signal amount kurtosis P1 when time t1, record a reflected signal amount kurtosis P2 during time t2.
Figure 3 shows that the driving circuit 30 output voltage synoptic diagram when known technology is normally declared dish, its transverse axis express time, the longitudinal axis are represented the output voltage values of driving circuit 30, output voltage is V0 when the time is t0, output voltage was V1 when the time was t1, output voltage was V2 when the time was t2, output voltage was V3 when the time was t3, and the volume reflection synoptic diagram of its timeline units when normally declaring dish with the known technology of Fig. 2 is corresponding.
Referring to Fig. 3, driving circuit 30 output V0 magnitudes of voltage when the time is t0, make the object lens 14 shown in Fig. 4 A be positioned at mechanical lower limit H0, this moment, focal spot SP did not focus on the disc 20, therefore in the volume reflection synoptic diagram when the known technology of Fig. 2 is normally declared dish, the reflected signal amount that time t0 records is not greater than default value S1, so do not obtain reflected signal.
Again referring to Fig. 3, when the time during by t0 to t1 driving circuit 30 output voltages rise to V1 by V0, make the actuator 32 moving target thing lens 14 shown in Fig. 4 A move to object lens 14 positions shown in Fig. 4 B by mechanical lower limit H0 position, this moment, focal spot SP touched the plastic layer PL1 of disc 20, therefore in the volume reflection synoptic diagram when the known technology of Fig. 2 is normally declared dish, the reflected signal amount that time t1 records is greater than default value S1, so obtain the first reflection spike P1.
Again referring to Fig. 3, when the time during by t1 to t2 driving circuit 30 output voltages rise to V2 by V1, make the actuator 32 moving target thing lens 14 shown in Fig. 4 B move to object lens 14 positions shown in Fig. 4 C, this moment, focal spot SP touched the reflection horizon RF1 of disc 20, therefore in the volume reflection synoptic diagram when the known technology of Fig. 2 is normally declared dish, the reflected signal amount that time t2 records is greater than default value S1, so obtain the second reflection spike P2.
Again referring to Fig. 3, when the time during by t2 to t3 driving circuit 30 output voltages rise to V3 by V2, make the actuator 32 moving target thing lens 14 shown in Fig. 4 C move to object lens 14 positions shown in Fig. 4 D, this moment, focal spot SP did not focus on the disc 20, therefore in the volume reflection synoptic diagram when the known technology of Fig. 2 is normally declared dish, the reflected signal amount that time t3 records is greater than default value S1,, so do not obtain reflected signal.
Illustrate further, Figure 3 shows that the driving circuit output voltage synoptic diagram when normally declaring dish, time is t0 when declaring dish action beginning, this moment, driving circuit 30 output fixed voltages rose to V3 by V0, make the actuator 32 moving target thing lens 14 shown in Fig. 4 A move to the mechanical upper limit H2 shown in Fig. 4 B from mechanical lower limit H0, make focal spot SP successively pass through the plastic layer PL1 and the reflection horizon RF1 of disc 20, measuring beam Y is differentiated the kind of disc 20 by the distance difference of plastic layer PL1 and reflection horizon RF1 reflex time.
More specifically, Fig. 5 is the reflected signal measurement result synoptic diagram of known technology disc identifying method, its transverse axis express time, the longitudinal axis are represented the measured volume reflection of variety classes disc (DVD, CD) respectively, plastic layer can produce trace reflection spike P1 to focal spot, and the reflection horizon can produce bigger reflection spike P2 to focal spot, these two spike distances of DVD disc are about 0.6mm, and these two mistimings that spike produced are t
A-t
0And these two spike distances of CD disc are about 1.2mm, and these two mistimings that spike produced are t
B-t
0Know promptly that by these two time interval that spike produced distances of judgement or mistiming which kind of pattern disc is.
Again referring to Fig. 3, because driving circuit 30 output fixed voltages rise to V3 by V0, make the actuator 32 moving target thing lens 14 shown in Fig. 4 A move to the mechanical upper limit H2 shown in Fig. 4 B from mechanical lower limit H0, yet when disc 20 has warping phenomenon, disc 20 positions can because of warping phenomenon than normal position or high or low, when disc 20 makes that because of warping phenomenon plastic layer PL1 position is lower than H2, will make object lens 14 knock disc 20, when disc makes that because of warping phenomenon plastic layer PL1 position is too high, will make object lens 14 focal spot SP can't pass through the plastic layer PL1 or the reflection horizon RF1 of disc 20, and then can't declare dish.
Figure 6 shows that the volume reflection synoptic diagram that disk location was low excessively when known technology was declared dish, its transverse axis express time, the longitudinal axis are represented reflected signal, record a reflected signal amount kurtosis P1 when time t1, record a reflected signal amount kurtosis P2 during time t2.
Figure 7 shows that the driving circuit output voltage synoptic diagram that disk location was low excessively when known technology was declared dish, its transverse axis express time, the longitudinal axis are represented the output voltage values of driving circuit 30, output voltage is V0 when the time is t0, output voltage was V1 when the time was t1, output voltage was V2 when the time was t2, output voltage was V3 when the time was t3, and its timeline units volume reflection synoptic diagram that disk location is low excessively when declaring dish with the known technology of Fig. 6 is corresponding.
Referring to Fig. 7, driving circuit 30 output V0 magnitudes of voltage when the time is t0, make the object lens 14 shown in Fig. 8 A figure be positioned at mechanical lower limit H0, this moment, focal spot SP did not focus on the disc 20, therefore in the volume reflection synoptic diagram that disk location is low excessively when the known technology of Fig. 6 is declared dish, the reflected signal amount that time t0 records is not greater than default value S1, so do not obtain reflected signal.
Again referring to Fig. 7, when the time during by t0 to t1 driving circuit 30 output voltages rise to V1 by V0, make the actuator 32 moving target thing lens 14 shown in Fig. 8 A move to object lens 14 positions shown in Fig. 8 B by mechanical lower limit H0 position, this moment, focal spot SP touched the plastic layer PL1 of disc 20, therefore in the volume reflection synoptic diagram that disk location is low excessively when the known technology of Fig. 6 is declared dish, the reflected signal amount that time t1 records is greater than default value S1, so obtain the first reflection spike P1.
Again referring to Fig. 7, when the time during by t1 to t2 driving circuit 30 output voltages rise to V2 by V1, make the actuator 32 moving target thing lens 14 shown in Fig. 8 B move to object lens 14 positions shown in Fig. 8 C, this moment, focal spot SP touched the reflection horizon RF1 of disc 20, therefore in the volume reflection synoptic diagram that disk location is low excessively when the known technology of Fig. 6 is declared dish, the reflected signal amount that time t2 records is greater than default value S1, so obtain the second reflection spike P2.
Again referring to Fig. 7, when the time during by t2 to t3 driving circuit 30 output voltages rise to V3 by V2, make the actuator 32 moving target thing lens 14 shown in Fig. 8 C move to the position of mechanical upper limit H2 shown in Fig. 8 D, this moment is because disc 20 positions are low excessively, can strike disc 20 when causing object lens 14 to move to H2, and focal spot SP does not focus on the disc 20, therefore in the volume reflection synoptic diagram that disk location is low excessively when the known technology of Fig. 6 is declared dish, the reflected signal amount that time t3 records is not greater than default value S1, so do not obtain reflected signal.
Figure 9 shows that the too high volume reflection synoptic diagram of disk location when known technology is declared dish, its transverse axis express time, the longitudinal axis are represented reflected signal, record a reflected signal amount kurtosis P1 when time t2.
Figure 10 shows that the too high driving circuit output voltage synoptic diagram of disk location when known technology is declared dish, its transverse axis express time, the longitudinal axis are represented the output voltage values of driving circuit 30, output voltage is V0 when the time is t0, output voltage was V1 when the time was t1, output voltage was V2 when the time was t2, and its timeline units when declaring dish with the known technology of Fig. 9 the too high volume reflection synoptic diagram of disk location corresponding.
Referring to Figure 10, driving circuit 30 output V0 magnitudes of voltage when the time is t0, make the object lens 14 shown in Figure 11 A be positioned at mechanical lower limit H0, this moment, focal spot SP did not focus on the disc 20, therefore when the known technology of Fig. 9 is declared dish in the too high volume reflection synoptic diagram of disk location, the reflected signal amount that time t0 records is not greater than default value S1, so do not obtain reflected signal.
Again referring to Figure 10, when the time during by t0 to t1 driving circuit 30 output voltages rise to V1 by V0, make the actuator 32 moving target thing lens 14 shown in Figure 11 A move to object lens 14 positions shown in Fig. 1 1B by mechanical lower limit H0 position, arrive object lens 14 positions shown in Figure 11 C again, this moment, focal spot SP did not touch the plastic layer PL1 of disc 20, therefore when the known technology of Fig. 9 is declared dish in the too high volume reflection synoptic diagram of disk location, the reflected signal amount that time t1 records is also less than default value S1, so do not obtain reflected signal.
Again referring to Figure 10, when the time during by t1 to t2 driving circuit 30 output voltages rise to V2 by V1, make the actuator 32 moving target thing lens 14 shown in Figure 11 C move to the mechanical upper limit H2 position shown in Figure 11 D, this moment, focal spot SP touched the plastic layer PL1 of disc 20, therefore when the known technology of Fig. 9 is declared dish in the too high volume reflection synoptic diagram of disk location, the reflected signal amount that time t2 records is greater than default value S1, so obtain a reflection spike P1.
Shown in Figure 11 D, because disc 20 positions are too high, the focal spot SP when causing object lens 14 to move to mechanical upper limit H2 on the measuring beam Y can only touch the plastic layer PL1 of disc 20 and can not pass through reflection horizon RF1.Therefore when declaring dish, the known technology of Fig. 9 in the too high volume reflection synoptic diagram of disk location, has only to produce a reflection spike P1, so cause to differentiate the kind of disc 20.
Summary of the invention
The object of the present invention is to provide a kind of optical medium determination methods, can effectively avoid CD-ROM drive when declaring dish, maybe can't declare the phenomenon of dish because of the warping phenomenon of disc causes object lens collision disc.
For achieving the above object, the invention provides a kind of optical medium determination methods, this method comprises the following step: an optical focus unit is placed a primary importance, and drive this optical focus unit and shift to disc; Detect a reflected signal by a reading unit; When this reflected signal during more than or equal to a predetermined value, one drive circuit applies a predetermined voltage to this optical focus unit, so that this optical focus cell moving one fixed range; Continue to detect this reflected signal, to differentiate disk types.
This optical medium is a CD.
This primary importance is a mechanical lower limit.
This reading unit is a device for testing light.
This predetermined voltage is into a ratio with this fixed range.
This optical focus unit comprises object lens and an actuator.
This reflected signal is that a laser beam is projeced into the volume reflection on this CD.
This predetermined value is to be projeced into reflection value on the plastic layer of this CD from this laser beam.
This fixed range is greater than this disk thickness.
This fixed range is the distance that sees through a luminous point of this object lens focus less than these object lens and this laser beam.
That is to say, according to purpose of the present invention, optical medium determination methods provided by the invention is a volume reflection measured when utilizing focal spot to pass through the plastic layer of disc, device for testing light makes driving circuit export a suitable direct current rising voltage difference Δ V according to this volume reflection, driving actuator and then make the object lens move a relative distance Δ H who is proportional to Δ V makes the object lens move to one and can declare the appropriate location that dish can not touch disc again.
Description of drawings
Fig. 1 reads the system schematic of signal for the known technology CD-ROM drive;
Volume reflection synoptic diagram when Fig. 2 normally declares dish for known technology;
Driving circuit output voltage synoptic diagram when Fig. 3 normally declares dish for known technology;
Fig. 4 A～Fig. 4 D is the synoptic diagram that the object lens of known technology when normally declaring dish move;
Fig. 5 is the reflected signal measurement result synoptic diagram of known technology disc identifying method;
The volume reflection synoptic diagram that disk location was low excessively when Fig. 6 declared dish for known technology;
The driving circuit output voltage synoptic diagram that disk location was low excessively when Fig. 7 declared dish for known technology;
Fig. 8 A～Fig. 8 D be known technology when declaring dish the low excessively object lens of disk location move synoptic diagram;
The too high volume reflection synoptic diagram of disk location when Fig. 9 declares dish for known technology;
The too high driving circuit output voltage synoptic diagram of disk location when Figure 10 declares dish for known technology;
Figure 11 A～Figure 11 D be known technology when declaring dish the too high object lens of disk location move synoptic diagram;
Volume reflection synoptic diagram when Figure 12 declares dish for the present invention;
Driving circuit output voltage synoptic diagram when Figure 13 declares dish for the present invention;
The object lens of Figure 14 A～when Figure 14 D declares dish for the present invention move synoptic diagram;
Figure 15 is a process flow diagram of the present invention.
Wherein, description of reference numerals is as follows:
The 10-laser diode; The 11-optical splitter that polarizes; 12-point instrumentation lens;
A wave plate of four minutes of 13-; 14-object lens; The 15-condenser lens;
1 6-device for testing light; The 20-disc; The 22-data Layer; The 30-driving circuit;
The 32-actuator; The SP-focal spot; The RF1-reflection horizon; The PL1-plastic layer;
The Y-measuring beam.
Embodiment
Put it briefly, the invention provides a kind of optical medium determination methods, comprise the following step: an optical focus unit is placed a primary importance, and drive this optical focus unit and shift to disc; Detect a reflected signal by a reading unit; When this reflected signal during more than or equal to a predetermined value, one drive circuit applies a predetermined voltage to this optical focus unit, so that this optical focus cell moving one fixed range; Continue to detect this reflected signal, to differentiate disk types.This optical medium is a CD, as the disc among Fig. 1 20.This primary importance is a mechanical lower limit H0.This reading unit is a device for testing light 16.This predetermined voltage is into a ratio with this fixed range.This optical focus unit comprises object lens 14 and an actuator 32.This reflected signal is that a laser beam is projeced into the volume reflection on this CD.This predetermined value is to be projeced into reflection value on the plastic layer PL1 of this CD from this laser beam.This fixed range is greater than this disk thickness.This fixed range is the distance that sees through a luminous point of this object lens focus less than these object lens and this laser beam.
Optical medium determination methods provided by the invention, can effectively avoid CD-ROM drive when declaring dish, because of causing object lens 14 collision discs 20, the warping phenomenon of disc maybe can't declare the phenomenon of dish, the present invention can be applicable to CD-ROM drive shown in Figure 1 and reads signal system, therefore also cooperate assembly explanation the present invention of Fig. 1, flow process of the present invention is as follows:
Step S100: keeping the DC voltage of output voltage V 0 by one drive circuit, make the object lens stay in height H 0, is a mechanical lower limit;
Step S102: progressively increase output voltage by this driving circuit, and device for testing light while detection of reflected amount;
Step S104: whether surpassing a predetermined value by a device for testing light detection of reflected amount is;
Step S106. with output voltage V 0 rising one predetermined voltage difference Δ V, when volume reflection surpasses a predetermined value, makes output voltage arrive target voltage V3 by this driving circuit;
Step S108: continue the detection laser volume reflection by this device for testing light, in order to judge disc kind;
Figure 12 shows that the volume reflection synoptic diagram when the present invention declares dish, its transverse axis express time, the longitudinal axis are represented reflected signal, record a reflected signal amount kurtosis P1 when time t1, record a reflected signal amount kurtosis P2 during time t2.
Figure 13 shows that the driving circuit output voltage synoptic diagram when the present invention declares dish, its transverse axis express time, the longitudinal axis are represented the output voltage values of driving circuit 30, output voltage is V0 when the time is t0, output voltage was V1 when the time was t1, output voltage was V2 when the time was t2, output voltage was V3 when the time was t3, and Δ V is the voltage difference between V1 and V3, and the volume reflection synoptic diagram of timeline units when declaring dish with the present invention shown in Figure 12 is corresponding.
Referring to Figure 13, driving circuit 30 output voltage values V0 when the time is t0, make the object lens 14 shown in Fig. 4 A be positioned at mechanical lower limit H0, this moment, focal spot SP did not focus on the disc 20, therefore in the volume reflection synoptic diagram when the present invention of Figure 12 declares dish, the reflected signal amount that time t0 records is not greater than default value S1, so do not obtain reflected signal.
Again referring to Figure 13, when the time during by t0 to t1 driving circuit 30 output voltages rise to V1 by V0, make the actuator 32 moving target thing lens 14 shown in Figure 14 A move to the object lens 14 position H1 shown in Figure 14 B by mechanical lower limit H0 position, this moment, focal spot SP touched the plastic layer PL1 of disc 20, therefore in the volume reflection synoptic diagram when the present invention of Figure 12 declares dish, the reflected signal amount that time t1 records is greater than default value S1, so obtain the first reflection spike P1.
Again referring to Figure 13, after device for testing light 16 is obtained the first reflection spike P1, the driving circuit 30 output voltages predetermined voltage difference Δ V that rises rises to V2 by V1 and arrives target voltage V3 again, drive the actuator 32 of Figure 14 B, and then make the object lens 14 that are positioned at H1 move to object lens 14 positions shown in Figure 14 C, arrive the object lens 14 position H2 shown in Figure 14 D again, above-mentioned predetermined voltage difference Δ V is proportional to the relative distance Δ H that is moved to H2 by H1, device for testing light 16 continues detected reflectance signal simultaneously, driving circuit 30 output voltages are V2 when the time is t2, this moment, focal spot SP touched the reflection horizon RF1 of disc 20 shown in Figure 14 C, therefore in the volume reflection synoptic diagram when the present invention of Figure 12 declares dish, the reflected signal amount that time t2 records is greater than default value S1, so obtain the second reflection spike P2, this moment, device for testing light 16 detected the second reflection spike P2 in order to judge disc kind.
This predetermined voltage difference Δ V shown in Figure 13 needs the object lens 14 of enough mobile Figure 14 D, make focal spot SP by reflection horizon RF1, but can not be excessive, cause object lens 14 to knock disc 20, ideal thing lens 14 can be parked in the position suitable apart from disc 20 1.
Predetermined voltage difference Δ V can be tried to achieve by following:
The known output voltage that object lens 14 highly are proportional to driving circuit 30 under perfect condition is
H＝K×V (1)
Therefore, the object lens 14 under V1, V2 voltage are highly respectively
H1＝k×V1 (2)
H2＝k×V2 (3)
Can get
Above-mentioned formula (1), (2), (3), (4) symbolic representation are as follows:
K is that fixed proportion coefficient, H are that object lens 14 height, V are the output voltage values of driving circuit 30.
Referring to Figure 14 D, Δ H must just can make focal spot SP by all reflection horizon RF1 greater than disc thickness herein; Δ H must can not knock disc 20 to guarantee object lens 14 less than the length between object lens 14 and the focal spot SP (that is device for testing light 16 detects the distance of object lens 14 and disc 20 during greater than the reflected signal of default value) in addition.
In sum, optical medium determination methods of the present invention can effectively solve CD-ROM drive when declaring dish, because the warping phenomenon of disc 20, it is low or high to produce disk location, and cause object lens 14 bump discs 20 maybe can't declare the situation of dish, and then the serviceable life of increase object lens 14 and disc 20, and improve and declare the dish probalility of success.Not existing before its application again in publication or public use.
Above-mentioned accompanying drawing that discloses and explanation only are embodiments of the invention, allly are skillful in this operator when can doing other all improvement according to above-mentioned explanation, these change still belong to invention spirit of the present invention and below in the fixed claim that is situated between.
Claims (10)
1. optical medium determination methods is characterized in that this method comprises the following step:
One optical focus unit is placed a primary importance, and drive this optical focus unit and shift to disc;
Detect a reflected signal by a reading unit;
When this reflected signal during more than or equal to a predetermined value, one drive circuit applies a predetermined voltage to this optical focus unit, so that this optical focus cell moving one fixed range;
Continue to detect this reflected signal, to differentiate disk types.
2. optical medium determination methods as claimed in claim 1 is characterized in that this optical medium is a CD.
3. optical medium determination methods as claimed in claim 2 is characterized in that this primary importance is a mechanical lower limit.
4. optical medium determination methods as claimed in claim 2 is characterized in that this reading unit is a device for testing light.
5. optical medium determination methods as claimed in claim 2 is characterized in that this predetermined voltage is into a ratio with this fixed range.
6. optical medium determination methods as claimed in claim 2 is characterized in that this optical focus unit comprises object lens and an actuator.
7. optical medium determination methods as claimed in claim 6 is characterized in that this reflected signal is that a laser beam is projeced into the volume reflection on this CD.
8. optical medium determination methods as claimed in claim 7 is characterized in that this predetermined value is to be projeced into reflection value on the plastic layer of this CD from this laser beam.
9. optical medium determination methods as claimed in claim 6 is characterized in that this fixed range is greater than this disk thickness.
10. optical medium determination methods as claimed in claim 7 is characterized in that this fixed range is the distance that sees through a luminous point of this object lens focus less than these object lens and this laser beam.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2003101006882A CN100362574C (en) | 2003-10-13 | 2003-10-13 | Optical medium determination method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2003101006882A CN100362574C (en) | 2003-10-13 | 2003-10-13 | Optical medium determination method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1607580A true CN1607580A (en) | 2005-04-20 |
| CN100362574C CN100362574C (en) | 2008-01-16 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2003101006882A Expired - Fee Related CN100362574C (en) | 2003-10-13 | 2003-10-13 | Optical medium determination method |
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| Country | Link |
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| CN (1) | CN100362574C (en) |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11283319A (en) * | 1998-03-31 | 1999-10-15 | Toshiba Corp | Method and device for discriminating optical disk |
| JP2001110128A (en) * | 1999-10-08 | 2001-04-20 | Matsushita Electric Ind Co Ltd | Optical disk device and discriminating method of optical disk |
| CN1178215C (en) * | 2001-06-21 | 2004-12-01 | 建兴电子科技股份有限公司 | Method for quickly regulating focusing error signal level of optical disc drive |
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| CN100362574C (en) | 2008-01-16 |
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Owner name: MEDIATEK INC. Free format text: FORMER OWNER: YANGZHI SCIENCE + TECHNOLOGY CO. LTD. Effective date: 20050513 |
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Effective date of registration: 20160525 Address after: Hefei City, Anhui province 230000 Wangjiang Road No. 800 building 10 layer A3 Innovation Industrial Park Patentee after: Smart technology (Hefei) Co., Ltd. Address before: Hsinchu, Taiwan, China Patentee before: MediaTek.Inc |
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Address after: Hefei City, Anhui province 230000 Wangjiang Road No. 800 building 10 layer A3 Innovation Industrial Park Patentee after: Hefei Jie FA Technology Co., Ltd. Address before: Hefei City, Anhui province 230000 Wangjiang Road No. 800 building 10 layer A3 Innovation Industrial Park Patentee before: Smart technology (Hefei) Co., Ltd. |
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Granted publication date: 20080116 Termination date: 20201013 |
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