CN100380489C

CN100380489C - Initial detecting and control method for light pick-up device to double layer optic disk

Info

Publication number: CN100380489C
Application number: CNB2004100891110A
Authority: CN
Inventors: 徐廷侨
Original assignee: Shanghai LG Electronics Co Ltd
Current assignee: Shanghai LG Electronics Co Ltd
Priority date: 2004-12-03
Filing date: 2004-12-03
Publication date: 2008-04-09
Anticipated expiration: 2024-12-03
Also published as: CN1783282A

Abstract

The present invention relates to the initial detecting and control method of a light pick-up device to a double-layer optic disk, which comprises the following steps: step 1, if the specified optical disk is inserted, a blue laser is used to start initial recognition, and an object lens for BD is selected; step 2, the object lens for BD is downwards focused and then upwards focused, the emitting surface signals of the inserted optical disk are simultaneously detected, and whether data surface signals are detected or not in a certain distance is confirmed after the detection (or isolation, demodulation) of the emitting surface signals of the optical disk; step 3, if the data surface signals are not detected in the certain distance, the detecting operation of the data surface signals is ended, and the object lens is moved to an initial position, if the data surface signals are detected in the certain distance, the optical disk for BD is recognized, and BD treatment is executed.

Description

Optical take-up apparatus is to the initial detecting and control method of double-layer CD

[technical field]

This invention is at light picker, refer in particular to the initial detecting and control method of double-layer CD, that is: according to the CD more than at least 3 kinds, double lens and be used for the record regenerating laser diode separately of CD separately, the control initial detecting contacts with CD to prevent object lens.

[background technology]

Along with film and so on animation is compressed as information, also need CD and DVD class CD can store digital video signal about 2 hours.But the DVD maximum that has the maximal memory capacity in CD only can write down the capacity of 4.7GBytes, so be difficult to be fit to 2 hours animation of record at present as information.

Recently, along with the HD mode digital broadcasting of high image quality is popularized in worldwide, among the BD of noticeable ultra micro (blue laser disc) is developing with record regenerator.Can utilize blue laser disc (BD) that this short wavelength's blue laser writes down maximum 27GB capacity is that the DVD of 4.7GB more can write down the more image information of high image quality than maximum storage capacity really.

Meanwhile, video disc recording and regenerating unit are to use DVD, CD, BD multiple media such as (Blue-ray Disk), utilize a kind of laser all CDs that are difficult to regenerate, so need the device and method of identification CD/DVD and BD CD.

Existing dvd system is broadly divided into two kinds.

First method: at first use S-curve (S curve) level of CD laser determination CD, use DVD laser determination S-curve level then, after again two kinds of levels being compared, discern the CD of a big side.

Second method: as shown in Figure 1, the lens mount of focusing light picker 13 detects from the signal of CD 10 reflection, and is standard identification CD with its distance.

With reference to Fig. 1 (a), although the thickness of DVD CD 10 and CD CD 20 all is 1.2mm,, the distance between DVD CD 10 its data surfaces 12 and the beam incident surface 11 is 0.6mm, data surface is positioned at the centre of overall optical disc thickness.Therefore, when focusing light pick-up regulator 13, need the t1 time from the signal (S-curve1) of the plane of incidence 11 reflections and the signal (S-curve2) that reflects from data surface 12, promptly t1 equals the displacement/distance (0.6mm) of lens.

Shown in Fig. 1 (b), the distance that CD CD 20 its beam incident surfaces 21 and data surface are 22 is 1.2mm, and data surface 22 is positioned at the reverse side of CD.Therefore, when focusing light pick-up regulator 23, from the S-curve1 signal of the CD plane of incidence 21 reflections and the S-curve2 signal demand t2 time of reflecting from data surface 22, promptly t2 equals the displacement/distance (1.2mm) of lens.

Therefore, when light picker when using DVD laser and rotation (Swing) object lens 13,23, by calculating from the S-curve1 signal of the CD plane of

incidence

11,12 reflections and just can discerning the kind of CD from the mistiming between the S-curve2 signal of

data surface

12,22 reflections.

But the problem of first method is that when each CD reflection rate differed greatly, the ratio of wrong identification CD was higher.

And though second method can remedy the shortcoming of first method, the sensitivity of regulator or the error of driving voltage etc. make a mistake and discern the problem of CD in the time of can rotating because of lens.

Fig. 2 is the synoptic diagram of blue laser disc recognition methods.As shown in Figure 2, the distance that blue laser disc 30 its data surfaces 32 and beam incident surface are 31 is 0.1mm, so can adopt above-mentioned two kinds of methods too.That is, from the S-curve1 signal of the plane of incidence 31 reflection of blue laser disc 30 with from S-curve2 signal demand t3 time of data surface reflection, promptly t3 equals the displacement/distance (0.1mm) of lens.

In order to regenerate and write down the optical pick-up regulator of all above three kinds of CDs, as shown in Figure 3, the lens mount 43 of pick-up is provided with and is used for the BD object lens 45 and the CD/DVD object lens 44 that are used for CD/DVD CD of BD with CD, and their rely on central shaft 46 rotations.Initial stage is configured to certain lenses.

For identification and the above multiple CD of visit (access), shown in Fig. 4 (a), for twin-lens light picker 43 is installed, lens mount is provided with CD/DVD object lens 44 and BD object lens 45.At this moment, BD is shorter with object lens 44 focal lengths than CD/DVD with object lens 45 its focal lengths, think the performance of guaranteeing regulator 43, by more being provided with object lens 44 near the interval of CD than CD/DVD.

But, shown in Fig. 4 (b), under inserting DVD CD 40 and carrying out situation that light picks up with BD with object lens 45, BD descends with object lens 45, after plane of incidence signal detects, upwards focusing always till when the data surface signal detects is risen BD with object lens 45, with the problem that takes place to contact with CD if continue this moment along cd side.

So, under the situation with BD laser identification CD, if insert CD/DVD CD 50, for seeking the data surface signal, the situation of the lens contact CD shown in Fig. 4 (b) will take place.If BD touches CD 50 as mentioned above with object lens 45, not only CD can sustain damage, and objective lens also can sustain damage.

[summary of the invention]

This invention finds out for addressing the above problem, and purpose is to provide the initial detecting and control method of a kind of optical take-up apparatus to double-layer CD, that is: lens mount configuration double lens can make CD and object lens not be subjected to a bit damage in identification CD process.

Another purpose of this invention provides the initial detecting and control method of the optical take-up apparatus of following other content to double-layer CD, that is: for utilizing CD/DVD to discern with some in the object lens with object lens and BD under the situation of CD beginning initial stage identification CD of insertion, when specific object lens when the data plane of incidence is upwards focused, detecting the distance that has or not or upwards focus from the plane of incidence with the data surface signal is benchmark, controls the detection of initial stage CD.

To achieve these goals, the optical take-up apparatus of this invention comprises following step to the initial detecting and control method of double-layer CD:

When CD inserts, begin to carry out initial stage identification, and select corresponding object lens in BD that on lens mount, disposes and the CD/DVD double lens with blue laser;

To upwards focus again after the focusing downwards of the above-mentioned object lens of having selected, and detect the plane of incidence signal of the above-mentioned CD that has inserted;

After the plane of incidence signal of above-mentioned CD detects, confirm at certain distance with the interior data surface signal that whether detects;

Above-mentioned affirmation result does not detect the data surface signal in this way, then interrupts detecting the data surface signal, and object lens are moved to primary position;

Above-mentioned affirmation result detects the data surface signal in this way, and then identification is the BD CD, carries out BD and handles.

If do not detect the data surface signal, then identification is CD/DVD, and selects the CD/DVD object lens in BD that disposes on lens mount and the CD/DVD double lens;

After detecting the plane of incidence signal of above-mentioned CD, judge in the pre-determined time, whether to detect the data surface signal;

Above-mentioned judged result detects the data surface signal in this way, and then identification is the BD CD, interrupts then surveying.Do not detect the data surface signal in this way, then lens are moved to primary position, identification is the CD/DVD CD then, and selects corresponding object lens.

And relevant optical take-up apparatus also comprises following step to the detecting and control method of double-layer CD in this invention:

If the insertion CD, the identification of beginning initial stage is DVD LD, selects the CD/DVD object lens then;

The above-mentioned CD/DVD object lens of having selected that descend, upwards focusing detects data plane of incidence signal simultaneously then;

If above-mentioned data plane of incidence signal is detected, then judge in the distance of setting in advance whether detect the data surface signal;

According to the distance that above-mentioned data surface signal detects, discern a kind of CD in the mutual variety classes CD.If identify CD, then interrupt surveying, carry out processing to corresponding CD.

The optical take-up apparatus of above-mentioned this invention to the effect of the initial detecting and control method of double-layer CD is: utilize double lens to control the basis of characterization laser diode to BD CD, DVD CD, the CD initial detecting of CD, thereby in identification CD process CD and lens are not damaged.

[description of drawings]

Fig. 1 is the synoptic diagram of existing DVD of explanation and CD optical disc discriminating method;

Fig. 2 is the synoptic diagram of the existing BD optical disc discriminating method of explanation;

Fig. 3 is the pie graph that is suitable for existing twin-lens lens mount;

Fig. 4 is the existing BD of explanation surveys control problem with the lens early period of origination a synoptic diagram;

Fig. 5 is the synoptic diagram of the DVD LD CD initial detecting and control method of explanation this invention embodiment;

Fig. 6 is the synoptic diagram of CD initial detecting and control method of the DVD LD of other examples of this invention;

Fig. 7 shows the process flow diagram of the optical take-up apparatus of the embodiment of the invention to the initial detecting and control method of double-layer CD;

Fig. 8 is the process flow diagram that shows the initial detecting and control method of BD LD CD;

Fig. 9 is the process flow diagram that shows the initial detecting and control method of DVD LD CD.

[embodiment]

Below with reference to accompanying drawings the initial detecting and control method of optical take-up apparatus of the present invention to double-layer CD is elaborated.

As Fig. 5 (a) (b) shown in, if CD 110 inserts, for discerning CD with the DVD laser diode light source, from attached to selecting CD/DVD object lens 114 double lens on pick-up 113 lens mounts 114,115, and detect the DVD laser beam by CD/DVD object lens 114 and incide the signal that CD 110 reflects again.

After this, if detect the signal that reflects from above-mentioned CD 110, then identification is the plane of incidence signal (S-curve1) of CD, continues upwards focusing, judges whether to detect the signal from CD reflection.At this moment, if detect data surface signal (S-curve2), the detection of focus will be interrupted.This detection method is: after detecting plane of incidence signal (S-curve1), if detecting data surface signal (S-curve2) through behind certain detection time, then interrupt focus detection.

Light source and the CD/DVD object lens of this method because of having utilized the DVD laser diode, thus applicable to all CD with CD, DVD with CD, BD CD.For distinguishing disc types, will be benchmark with the focus detection time (T_seek1) that detects data-signal, identification is CD with CD or DVD with CD or BD CD.

That is, it is definite with the order of CD＞DVD CD＞CD CD that the focus detection time is pressed BD, and will utilize this detection time identification disc types.

If under the situation with BD laser diode identification CD, as Fig. 6 (a) (b) shown in, if insert CD 120, select BD with object lens 125.The above-mentioned BD that has selected detects CD plane of incidence signal with object lens 125 focusing that will make progress.

At this moment, if detect the plane of incidence signal that reflexes to CD 120, then after this signal detects, confirm up to special time through the out-of-date data surface signal (S-curve2) that whether detects.If do not detect, then interrupt at once surveying.That is: BD attached on the structure of giving prominence to from lens mount, if upwards focus meeting contact CD again, so will interrupt detection, discerns the processing of CD with object lens 125 with laser diode with other DVD.

Fig. 7 to Fig. 9 has shown initial detecting and has discerned above CD uses CD with CD, BD with CD, DVD method.

With reference to Fig. 7,, then confirm whether discern CD S201, S203 by blue laser diode (BD CD) if insert CD, above-mentioned affirmation result is blue laser diode in this way, then select the BD object lens, and the object lens of upwards focusing, detect plane of incidence signal S205, S207 simultaneously from CD reflection.

After detecting above-mentioned plane of incidence signal, the object lens of upwards focusing judge simultaneously whether T1 detects the data surface signal in the time, judged result detects data of optical disk face signal at T1 in this way in the time, and then identification is the BD CD, and carries out BD treatment S 209, S211.Here, but the distance of the translational speed/data surface of T1 scioptics (0.1mm) obtain.

But the S209 judged result does not detect the data surface signal in this way, and then interrupting is the detection of BD LD CD, and object lens are moved to the position that primary position is promptly focused downwards, enters step S214, the S215 of identification DVD LD CD then.

Whether and will confirm to identify is DVD LD CD S215, if identification is DVD LD, then the CD/DVD object lens are selected in conversion, and detect plane of incidence signal S217, S219 from CD reflection.

And, after detecting DVD LD CD plane of incidence signal,,, confirm whether detect data-signal S221 apart from interior at D1 from detecting the time point of above-mentioned CD plane of incidence signal with upwards focusing of object lens, if detect, then identification is DVD, and carries out DVD and handle.Here, D1 distance is that the plane of incidence from the DVD CD is to the distance between data surface, roughly in 0.3～0.9mm scope.In addition, can with the initial detecting time detection of benchmark control said lens.

And, if in D1 distance with the interior data of optical disk face signal that do not detect, then confirm whether in the D2 distance, detect the data surface signal, if detect, then identification is the CD CD, carries out CD treatment S 221, S225, S227 then.Here, the D2 distance is roughly in 0.9～1.2mm scope.

And, if in D2 distance with the interior optical disc data face signal that do not detect yet, then carry out treatment S 239 by no CD or CD mistake.

Simultaneously, S229 under the situation of identification CD LD CD selects CD/DVD object lens S231, detects CD plane of incidence signal S233, and till upwards focusing when detecting CD plane of incidence signal.After detecting CD plane of incidence signal, if detect the data surface signal in the D1 distance, then identification is DVD CD S221, S223, if detect the data surface signal in the D2 distance, then identification is CD CD S225, S227.

Fig. 8 has shown the method for the relevant identification of this invention BD LD CD.

With reference to Fig. 8, if beginning initial stage identification BD LD CD is then selected the BD object lens, and the object lens S305 that focuses downwards.After this, whether the object lens of upwards focusing, and confirm whether to detect plane of incidence signal if detect plane of incidence signal, are then confirmed at certain distance with interior S307, S309, S311.That is, set restriction BD with the object lens limited range of focussing distance that makes progress, and confirm whether in its scope.

At this moment, if do not detecting the data surface signal yet above under the situation of above-mentioned certain distance scope, then interrupt logarithm moves to lens primary position S311, the S313 of downward focusing according to the operation that detects of face signal.

But, confirm certain distance with the interior data surface signal that detected, then identification is the BD CD, carries out BD treatment S 315, S317 then.

And, if at certain distance with the interior data surface signal that do not detect, then interrupt logarithm moves to primary position according to the operation that detects of face signal with lens, identification is the CD/DVD CD then, and DVD object lens S319 is selected in conversion.

As mentioned above, be identification BD LD CD,,, and upwards focus as benchmark so that BD contact with CD with object lens by focusing limited range setpoint distance.After plane of incidence signal detects, upwards focus more than the 0.2mm, if do not detect the data surface signal, then interrupt logarithm moves to primary position according to the operation that detects of face signal with lens.But, if at 0.2mm with the interior data surface signal that detects, then identification is the BD CD, and selects DVD (translator annotates: this DVD should be BD) to use object lens.If do not detect the data surface signal, then identification is other CD/DVD CDs, carries out the detection of initial stage CD.

Fig. 9 has shown the method for initial detecting DVD LD CD in this invention.

At first, if beginning initial stage identification DVD LD CD S401 then selects DVD object lens S403, object lens S405 upwards focuses.

At this moment, when upwards focusing object lens, begin to detect the plane of incidence signal of CD, if detect plane of incidence signal S407, S409, then after plane of incidence signal detects, detect optical disc data face signal in the D1 distance, then identification is the BD CD, and interrupt surveying, carry out BD treatment S 411, S413, S415.

And, if at the interior not detecting signal of D1 distance, then confirm whether in the D2 distance, detect optical disc data face signal S417, if detect optical disc data face signal, then identification is the DVD CD, and interrupt surveying, carry out DVD treatment S 419, S421.

In addition, D2 distance with interior NF situation under, confirm that the D3 distance is interior whether to detect optical disc data face signal S423 that if detect optical disc data face signal, then identification is the CD CD, interrupts surveying, and carries out CD treatment S 435, S427.There is not CD next being defined as of situation that surpasses D3.

Here, the distance that is used for the CD initial detecting is D1＞D2＞D3, and D1 is equivalent to the lens distance of BD LD, is 0～0.2mm, and the lens focus of CD/DVD distance is 0～2.3mm.So D1 is in the 0.2mm, D2 is 0.2mm～0.9mm, and D3 is 0.9mm～1.2mm.

By above-mentioned description, the related work personnel can carry out various change and modification fully in the scope that does not depart from this invention technological thought.

Therefore, the technical scope of this invention is not limited to the content on the instructions, must determine its technical scope according to interest field.

Claims

1. optical take-up apparatus comprises the initial detecting and control method of double-layer CD:

If CD inserts, begin initial stage identification with blue laser, select the blue laser disc object lens in BD that on lens mount, disposes and the CD/DVD double lens;

With the blue laser disc of above-mentioned selection with object lens focusing downwards after upwards focusing again, detect the plane of incidence signal of the CD of above-mentioned insertion simultaneously;

After detecting above-mentioned CD plane of incidence signal, confirm at certain distance with the interior data surface signal that whether detects;

Above-mentioned affirmation result does not detect the data surface signal in this way in certain distance, then interrupt the detection of data surface signal, and object lens are moved to primary position;

If above-mentioned data surface signal is detected with interior at certain distance, then identification is the blue laser disc CD, carries out blue laser disc and handles.

2. as the initial detecting and control method of claim item 1 described optical take-up apparatus, it is characterized in that double-layer CD,

If do not detect above-mentioned data surface signal at certain distance with interior, then identification is the CD/DVD CD, and selects the CD/DVD object lens in BD that disposes on described lens mount and the CD/DVD double lens.

3. as the initial detecting and control method of claim item 1 described optical take-up apparatus, it is characterized in that double-layer CD,

If above-mentioned judged result detects the data surface signal, then identification is blue laser disc, and interrupts surveying;

If do not detect the data surface signal, then lens are moved to primary position, identification is the CD/DVD CD then, and selects corresponding object lens.

4. as the initial detecting and control method of claim item 1 described optical take-up apparatus, it is characterized in that described method further comprises to double-layer CD:

If the insertion CD then begins initial stage identification DVD LD CD, and select the CD/DVD object lens in BD that disposes and the CD/DVD double lens on lens mount;

Upwards focusing again after the above-mentioned CD/DVD that has selected descended with object lens detects plane of incidence signal simultaneously;

After above-mentioned plane of incidence signal detects, judge whether to detect the data surface signal, and confirm the distance detect;

According to the distance that detects above-mentioned data surface signal, identification is a certain CD in blue laser disc or DVD CD or the CD CD, if identify above-mentioned CD, then interrupts surveying, and carries out the processing to corresponding CD.