CN100361207C - Initial servo operation control method of optic disc device - Google Patents
Initial servo operation control method of optic disc device Download PDFInfo
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- CN100361207C CN100361207C CNB2006100085043A CN200610008504A CN100361207C CN 100361207 C CN100361207 C CN 100361207C CN B2006100085043 A CNB2006100085043 A CN B2006100085043A CN 200610008504 A CN200610008504 A CN 200610008504A CN 100361207 C CN100361207 C CN 100361207C
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Abstract
The present invention relates to the initial servo operation control method of an optical disk device. In optical disks such as a DVD player, etc., a focus object lens upwards moves from an initial position toward the direction of an optical disk in a light picker. When the correct focus of the recording layer of the optical disk is detected, the movement of the focus object lens is immediately stopped. Simultaneously, the type of the optical disk is quickly judged after a position where the correct focus is detected is confirmed. The present invention can largely reduce the time required by the execution of initial servo operation, quickly judge the type of the optical disk, and have very high use value.
Description
Technical field
Patented claim of the present invention is dividing an application of number of patent application 03141404.4 (initial servo operation control method of optical disc apparatus).
The invention relates to the control method of the initial servo operation in the optical disc apparatus, refer in particular in optical disc apparatus such as Disc player, carry out initial servo operation control method a kind of optical disc apparatus of the focus servo operation of video disc recording layer by the focusing objective len that comprises in the mobile light picker that rises.
Background technology
Recently, the high density compact disc (such as DVD) that can store a large amount of high image quality video datas and high tone quality voice data is obtaining exploitation and universal, DVD player and DVD recording in addition, (as) optical disc apparatus such as machine also constantly obtaining exploitation and popularizing widely.
In addition, in optical disc apparatus such as above-mentioned Disc player, when inserting CDs such as DVD or CD have been installed in the device, for this video disc recording layer is carried out focus servo operation accurately, rise the focusing objective len in the light picker mobile to CD from predefined initial position to ad-hoc location.
In addition, as mentioned above, detect and confirm focusing objective len in the process that CD direction ad-hoc location moves, the zero crossings fulcrum of the focus error signal that detects, thus can carry out the correct focus point a series of preliminary servo operations such as (just focus point) that detects the video disc recording layer.Then, be benchmark with above-mentioned correct focus point, carry out vertical direction simultaneously and move the general focus servo operation of focusing objective len and the general tracking servo operation that horizontal direction moves focusing objective len.
But in the general optical disc apparatus, as mentioned above, because rising from initial position along the CD direction, the focusing objective len that comprises in the light picker moves to ad-hoc location, even so detect the zero crossings fulcrum that has obtained the corresponding focus error signal of positive focus point, focusing objective len also will move to the ad-hoc location that sets in advance, and therefore also just exists in the problem of wasting the unnecessary long period in the initial servo operation.
Summary of the invention
The present invention carries out in order to address the above problem.The present invention will provide the initial servo operation control method in a kind of optical disc apparatus, in optical disc apparatus such as DVD player, the focusing objective len that comprises during light picks up rises to the CD direction from initial position and moves, when the positive focus point of video disc recording layer is detected, just stop to move of focusing objective len immediately, simultaneously, confirm Detection Point, judge the type of CD rapidly.
The object of the present invention is achieved like this:
The initial servo operation control method of optical disc apparatus of the present invention, described optical disc apparatus comprises: by focusing objective len, driver, photo-fission device, laser diode, the light picker that photodetector constitutes; The light picker driver; Microprocessor; Rf processor; Data signal processor and CD, it is characterized in that described initial servo operation control method comprises following step: step 1, the focusing objective len of being controlled described light picker by described microprocessor operation moves to the CD direction gradually from predefined initial position; Step 2, in the moving process of the above-mentioned focusing objective len of described microprocessor persistent surveillance, the degree of tilt that focus error signal amplitude that described photodetector detects tilts is confirmed in the inclination that thereupon produces the focus error signal amplitude; Step 3, the tilt waveform of above-mentioned focus error signal amplitude have a zero cross point, and when detecting the zero cross point of above-mentioned focus error signal amplitude inclination, described microprocessor stops moving of above-mentioned focusing objective len.
Effect of the present invention:
Have said structure and have very high use value with the initial servo operation control method that carries out a kind of optical disc apparatus of the present invention of aforesaid operations.In optical disc apparatus such as DVD player, the focusing objective len that comprises during light picks up rises to the CD direction from initial position and moves, when the positive focus point of video disc recording layer is detected, just stop to move of focusing objective len immediately, simultaneously, confirm Detection Point, carry out the required time of initial servo operation, and judge the type of CD rapidly thereby can shorten greatly.
For further specifying above-mentioned purpose of the present invention, design feature and effect, the present invention is described in detail below with reference to accompanying drawing.
Description of drawings
Fig. 1 is the optical disc apparatus pie graph of the initial servo operation control method of application optical disc apparatus of the present invention;
Focus error signal and the radiofrequency signal oscillogram of Fig. 2 for detecting in the initial servo operation control method of optical disc apparatus of the present invention;
Fig. 3 is the first embodiment operational flowchart of the initial servo operation control method of optical disc apparatus of the present invention;
Fig. 4 is the second embodiment operational flowchart of the initial servo operation control method of optical disc apparatus of the present invention.
Embodiment
Below with reference to accompanying drawings, the embodiment to the initial servo operation control method of optical disc apparatus of the present invention is elaborated.
Fig. 1 is the optical disc apparatus pie graph of the initial servo operation control method of application optical disc apparatus of the present invention.For instance, in optical disc apparatus such as DVD player, comprise by focusing objective len 20, driver (actuator) 21, photo-fission device 22, laser diode (LD) 23, light picker and light picker (P/U) driver (P/U Driver) 25 that photodetector (PD:photo detector) 24 grades constitute, microprocessor 26, rf processor (RF) 27, and data signal processor (DSP) 28, wherein the focusing error of the radio frequency of rf processor 27 (RF) signal and photodetector 24 (FE:Focus Error) signal is input to microprocessor 26, data signal processor 28 output A/V signals, microprocessor 26 attended operation keys.
In addition, have in the optical disc apparatus of above-mentioned formation DVD can be installed, CDs such as CD 10, DVD is when being made as 1.2 millimeters thickness, recording layer is formed on thickness central authorities (0.6mm), though it is thick that above-mentioned CD also is made into 1.2mm, recording layer but is formed on the position (on the position of about 1.1mm) of closing on optical disc surface.
And, in the middle of the microprocessor 26 in the above-mentioned optical disc apparatus, when inserting in the device when CD 10 has been installed, the above-mentioned light picker driver 25 of operation control, then change the driving voltage of input in the driver of regulating in light picker 21, thereby above-mentioned focusing objective len 20 is moved to predefined initial position.
In addition, with above-mentioned poly-focus lamp 20 gradually when the CD direction rise to move, as shown in Figure 2, the photodetector 24 that possesses from light picker detects output focus error signal FE, in addition, from above-mentioned rf processor 27, detect the radiofrequency signal RF of output, and, detect the correct focus (justfocus point) of video disc recording layer with reference to this.
And above-mentioned correct focus is detected the back and just stops moving of focusing objective len 20 immediately.Simultaneously, after confirming to detect correct focal position, the optical disc types that inserts in the judgment means is DVD or CD.To be elaborated to this below.
Fig. 3 is the first embodiment operational flowchart of the initial servo operation control method of optical disc apparatus of the present invention.
Simultaneously referring to Fig. 3,1.
Flow process begins;
S10: insert fixing disc in the device;
S11: the driver 25 in the above-mentioned light picker of microprocessor 26 operation controls in the above-mentioned optical disc apparatus, thus above-mentioned focusing objective len 20 is moved to predefined initial position;
S12: with above-mentioned focusing objective len 20 from initial position gradually when the CD direction rise to move, relatively confirm the amplitude of the radio frequency rf signal that detects in the above-mentioned rf processor 27 incessantly;
S13: in addition, rise when mobile from initial position gradually by said process focusing objective len 20, the degree of tilt of radio frequency rf signal is confirmed in the inclination (Slope) of the RF signal amplitude of Chan Shenging thereupon;
S14: as shown in Figure 2, the waveform of radio frequency rf signal possesses a peak dot, thereby above-mentioned microprocessor 26 just can judge whether to detect the inclination peak dot of radio frequency rf signal, and that point at definite peak dot place, if do not detect peak dot, then, flow process is got back to S12, continues to repeat;
S15: when detecting above-mentioned radio frequency rf signal amplitude inclination peak dot in the above-mentioned S14 flow process, after judging that CD 10 recording layers are positioned at correct focus state, the above-mentioned light picker driver 25 of above-mentioned microprocessor 26 operation controls, keep the driving voltage that is input to above-mentioned driver 20, thereby stop moving of focusing objective len 20;
S16: pass through said process, confirm that the peak dot that the radio frequency rf signal amplitude tilts is detected the position, judge the type of CD, as previously mentioned, DVD is when being made as 1.2 millimeters thickness, recording layer is formed on thickness central authorities (0.6mm), though that above-mentioned CD also is made into 1.2mm is thick, recording layer but is formed on the position (on the position of about 1.1mm) of closing on optical disc surface.Therefore, when the peak dot of above-mentioned radio frequency rf signal amplitude is detected relatively comparatively fast, can judge that this CD is DVD; When the peak dot of above-mentioned radio frequency rf signal amplitude is detected when relatively slow, can judge that this CD is CD.
Fig. 4 is the second embodiment operational flowchart of the initial servo operation control method of optical disc apparatus of the present invention.
Simultaneously referring to Fig. 4,1.
Flow process begins;
S30: as previously mentioned, insert fixing disc in the device;
S31: the light picker driver 25 in the above-mentioned light picker of microprocessor 26 operation controls in the above-mentioned optical disc apparatus, thus above-mentioned focusing objective len 20 is moved to predefined initial position;
S32: with above-mentioned focusing objective len 20 from initial position gradually when the CD direction rise to move, relatively confirm the amplitude of the focusing error FE signal that detects in the above-mentioned photodetector 24 incessantly;
S33: in addition, by said process, focusing objective len 20 rises when mobile from initial position gradually, and the degree of tilt of focusing error FE signal amplitude is confirmed in the inclination (SLOPE) of the focusing error FE signal amplitude of Chan Shenging thereupon;
S34: as shown in Figure 2, the tilt waveform of focusing error FE signal amplitude has a zero cross point, thereby above-mentioned microprocessor 26 just can judge whether to detect the zero cross point that focus error signal FE amplitude tilts, if do not detect zero cross point, flow process is got back to S32, continues to repeat;
S35: if when detecting the zero cross point of above-mentioned focusing error FE signal amplitude in the above-mentioned S34 flow process, after judging that the video disc recording layer is positioned at correct focus state, the above-mentioned light picker driver 25 of above-mentioned microprocessor 26 operation controls, keep the driving voltage that is input to above-mentioned driver 20, thereby stop moving of focusing objective len;
S36: pass through said process, confirm that the zero cross point that focusing error FE signal amplitude tilts is detected the position, judge the type of CD, as previously mentioned, DVD is when being made as 1.2 millimeters thickness, recording layer is formed on thickness central authorities (0.6mm), though it is thick that above-mentioned CD also is made into 1.2mm, but recording layer but is formed on the position (on the position of about 1.1mm) of closing on optical disc surface, when the zero cross point that therefore above-mentioned focusing error FE signal amplitude tilts is detected relatively comparatively fast, can judge that this CD is DVD; The zero cross point that tilts when above-mentioned focus error signal amplitude is detected when relatively slow, can judge that this CD is CD.
Though the present invention describes with reference to current specific embodiment, but those of ordinary skill in the art will be appreciated that, above embodiment instrument is to be used for illustrating the present invention, should understand and wherein can make variations and modifications and do not break away from the present invention in a broad sense, so be not as limitation of the invention, as long as in connotation scope of the present invention, all will drop in the scope of claims of the present invention variation, the distortion of the above embodiment.
Claims (3)
1, a kind of initial servo operation control method of optical disc apparatus, described optical disc apparatus comprises: by focusing objective len, driver, photo-fission device, laser diode, the light picker that photodetector constitutes; The light picker driver; Microprocessor; Rf processor; Data signal processor and CD is characterized in that described initial servo operation control method comprises following step:
Step 1, the focusing objective len of being controlled described light picker by described microprocessor operation moves to the CD direction gradually from predefined initial position;
Step 2, in the moving process of the above-mentioned focusing objective len of described microprocessor persistent surveillance, the degree of tilt that focus error signal amplitude that described photodetector detects tilts is confirmed in the inclination that thereupon produces the focus error signal amplitude;
Step 3, the tilt waveform of above-mentioned focus error signal amplitude have a zero cross point, and when detecting the zero cross point of above-mentioned focus error signal amplitude inclination, described microprocessor stops moving of above-mentioned focusing objective len.
2, the initial servo operation control method of optical disc apparatus as claimed in claim 1, it is characterized in that in the described step 3 when detecting the zero cross point of above-mentioned focus error signal amplitude, just judge to have entered the correct focus state of video disc recording layer, thereby stop moving of above-mentioned focusing objective len.
3, the initial servo operation control method of optical disc apparatus as claimed in claim 1, it is characterized in that further comprising the steps of: the zero cross point of confirming above-mentioned focus error signal amplitude is detected the position, the optical disc types of installing in the judgment means is DVD or CD, when the zero cross point of described focus error signal amplitude inclination is detected relatively comparatively fast, judge that this CD is DVD; The zero cross point that tilts when described focus error signal amplitude is detected when relatively slow, judges that this CD is CD.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03141404 CN1255788C (en) | 2003-07-04 | 2003-07-04 | Original servo-actuated control method for compact disc device |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 03141404 Division CN1255788C (en) | 2003-07-04 | 2003-07-04 | Original servo-actuated control method for compact disc device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1822140A CN1822140A (en) | 2006-08-23 |
| CN100361207C true CN100361207C (en) | 2008-01-09 |
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Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 03141404 Expired - Fee Related CN1255788C (en) | 2003-07-04 | 2003-07-04 | Original servo-actuated control method for compact disc device |
| CNB2006100085043A Expired - Fee Related CN100361207C (en) | 2003-07-04 | 2003-07-04 | Initial servo operation control method of optic disc device |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 03141404 Expired - Fee Related CN1255788C (en) | 2003-07-04 | 2003-07-04 | Original servo-actuated control method for compact disc device |
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| CN (2) | CN1255788C (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1250930A (en) * | 1998-09-04 | 2000-04-19 | 索尼公司 | Optical head, recording and/or reproducing device, and CD driver |
| CN1278098A (en) * | 1999-06-22 | 2000-12-27 | 松下电器产业株式会社 | CD disc recording and reproducing device |
| US6172950B1 (en) * | 1997-08-19 | 2001-01-09 | Fujitsu Limited | Method for correcting tilt of magnet-optical readable medium apparatus to be used for its practice and magnet-optical readable medium |
| US6434096B1 (en) * | 1999-02-26 | 2002-08-13 | Matsushita Electric Industrial Co., Ltd. | Optical information recording/reproducing device |
-
2003
- 2003-07-04 CN CN 03141404 patent/CN1255788C/en not_active Expired - Fee Related
- 2003-07-04 CN CNB2006100085043A patent/CN100361207C/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6172950B1 (en) * | 1997-08-19 | 2001-01-09 | Fujitsu Limited | Method for correcting tilt of magnet-optical readable medium apparatus to be used for its practice and magnet-optical readable medium |
| CN1250930A (en) * | 1998-09-04 | 2000-04-19 | 索尼公司 | Optical head, recording and/or reproducing device, and CD driver |
| US6434096B1 (en) * | 1999-02-26 | 2002-08-13 | Matsushita Electric Industrial Co., Ltd. | Optical information recording/reproducing device |
| CN1278098A (en) * | 1999-06-22 | 2000-12-27 | 松下电器产业株式会社 | CD disc recording and reproducing device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1567443A (en) | 2005-01-19 |
| CN1255788C (en) | 2006-05-10 |
| CN1822140A (en) | 2006-08-23 |
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