CN1697042A - Tracking controller and optical disk device having the same - Google Patents
Tracking controller and optical disk device having the same Download PDFInfo
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- CN1697042A CN1697042A CN 200510058854 CN200510058854A CN1697042A CN 1697042 A CN1697042 A CN 1697042A CN 200510058854 CN200510058854 CN 200510058854 CN 200510058854 A CN200510058854 A CN 200510058854A CN 1697042 A CN1697042 A CN 1697042A
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Abstract
PROBLEM TO BE SOLVED: To eliminate an offset by stray light and to generate a tracking error signal in recording/reproducing to/from a multilayer optical disk.
Description
Technical field
The present invention relates to a kind of tracking controller (tracking control apparatus) and possess the compact disc device of this device, particularly relate to a kind of about because of from multilayer optical disc diffused light caused seeks the included composition (offset) that departs from the rail error signal (tracking error signal).
Background technology
Since known, in the compact disc device that laser discs such as CD and DVD are write down or reduce, be to utilize the differential method (Differential Push Pull, DPP is to call the DPP method in the following text) of recommending to generate and to seek the rail error signal, and sought rail control.The DPP method is by laser light being utilized diffraction grating (diffraction grating) be separated into totally 3 light beams of main beam (main beam) (0 light) and 2 beamlets (sub beam) (± 1 light), and make 2 beamlets only depart from the distance of half track pitch (pitch) along the track width direction, and detect recommending (push-pull) signal and getting that it is differential and eliminate and to depart from composition of each light beam to main beam.Though the DPP method is well-known, but describes simply below.
Figure 10 shows that the main beam in the DPP method and the relation of 2 beamlets.100,2 beamlets of main beam 102,104 for central authorities shine with the form of clamping main beam 100.Main beam 100 and beamlet 102, or main beam 100 and beamlet 104 only depart from half track pitch and shine along the track width direction respectively.Connect the state of (on track) shown in the figure for magnetic track, main beam 100 is positioned on the magnetic track n, and beamlet 104 is positioned at the centre of magnetic track n and magnetic track n+1, and beamlet 102 is positioned at the centre of magnetic track n and magnetic track n-1.As the phase place with main beam 100 is benchmark, and then the phase place of beamlet 102,104 departs from-180 degree and+180 degree respectively.In addition, in diagram, the luminous point of each light beam (spot) is split into 2 parts on the track width direction, but this is such with aftermentioned, and the catoptrical detecting device of accepting each light beam is corresponding by 2 situations about cutting apart on the track width direction.
Figure 11 shows that the circuit that utilizes the DPP method to generate the tracking controller of seeking the rail error signal constitutes.Catoptrical 22 signals (P signal and n-signal) of cutting apart detecting device (detector) (primary detector) 10 from accepting main beam 100 are fed into difference engine 16.The difference of 2 signals of difference engine 16 computings, and draw signal and output to difference engine 24 as promoting mainly.
Catoptrical 22 signals cutting apart detecting device (the 1st sub-detecting device) 12 from accepting sub-beam 102 are fed into difference engine 18.The difference of 2 signals of difference engine 18 computings, and output to totalizer 22 as the 1st sub-push-pull signal.And catoptrical 22 signals cutting apart detecting device (the 2nd sub-detecting device) 14 from accepting sub-beam 104 are fed into difference engine 20.The difference of 2 signals of difference engine 20 computings, and output to totalizer 22 as the 2nd sub-push-pull signal.
Totalizer 22 is carried out additive operation with 2 sub-push-pull signals, its weighted mean of union (for example simple average) and output to difference engine 24.
The difference of drawing signal and the sub-push-pull signal of weighted mean is promoted mainly in difference engine 24 computings, and outputs to amplifier 28.Even depart from, because departing from each push-pull signal, included these equate, so also can eliminate and depart from by these difference of computing because of the inclination of laser disc and the displacement of object lens etc. produce.As make and promote mainly that to draw signal be MPP, the 1st, the 2nd sub-push-pull signal is 1SPP, 2SPP, then seeks rail error signal TE to be
TE=MPP-k (1SPP+ 2SPP) ... (1)
Here, as in totalizer 22 when on average carrying out computing merely, k=1/2 then.Eliminated depart from composition seek the rail error signal, be exaggerated by amplifier 28, and be fed into the not shown rail servo-actuated circuit (tracking servo circuits) of seeking.
On the other hand, in order to seek the further densification of laser disc, adopt makes the record reducing zone carry out stacked multi-ply construction more in recent years.Even to multilayer optical disc, it also is effective utilizing DPP method as described above to seek rail control.
But, different with the individual layer laser disc in multilayer optical disc, from the reflected light of the layer except the layer that should write down reduction, can sneak into detecting device, and it forms the new problem that departs from as diffused light.For example, have in 2 layers of structure of the 1st layer and the 2nd layer at laser disc, and for record or the reduction of carrying out data to the 1st layer, and make laser beam under the situation of the 1st layer of enterprising line focusing, laser beam reflects and also reflects at the 2nd layer at the 1st layer, therefore, even utilize the DPP method to seek rail control, also can sneak into the 1st sub-detecting device and the 2nd sub-detecting device from the reflected light (diffused light) of the 2nd layer main beam, depart from and produce.
Figure 12 shows that is not having under the situation of diffused light, the relation of the reflected light separately 200,202,204 of 10,12,14 and 3 light beams 100,102,104 of 3 detecting devices.The reflected light 200 of main beam 100 is subjected to light by primary detector 10, and the reflected light 202 of the 1st beamlet 102 is subjected to light by the 1st sub-detecting device 12, and the reflected light 204 of the 2nd beamlet 104 is subjected to light by the 2nd sub-detecting device 14.And, Figure 13 shows that to exist under the situation of diffused light the relation of the reflected light separately 200,202,204 of 10,12,14 and 3 light beams 100,102,104 of 3 detecting devices.Except 3 reflected light 200,202,204, also show diffused light, promptly from except the layer that should write down or reduce layer the reflected light 300 (in diagram, being the reflected light of main beam 100) of light beam.Diffused light 300 carries out incident to 3 detecting devices 10,12,14 whole, forms to depart from composition.Certainly, when the light intensity of diffused light 300 equates in 3 detecting devices 10,12,14, can utilize the DPP method that it is eliminated, but also there are a lot of influences because of the inclination of multilayer optical disc and the displacement of object lens etc., and make the light intensity of diffused light and uneven situation, depart from this case and can not cancel and form residually, make the precise decreasing of seeking the rail error signal.
Therefore, in following Japanese documentation 1, disclosed and a kind ofly utilized 3 luminous points that multilayer optical disc is sought rail when control, in order to eliminate the composition that departs from that causes because of diffused light, and utilized the formation of the top envelope signal of sub-detector signal.That is, detect, and from the signal of sub-detecting device, deduct the top envelope signal, thereby eliminate the composition that departs from because of diffused light caused by the top envelope signal that wave detector antithetical phrase detector signal newly is set.
[Japanese documentation 1] spy opens flat 9-161295 communique
But above-mentioned known techniques is to utilize 3 right spot methods to seek the situation of rail control, and the method for recommending is particularly utilizing the DPP method to seek under the situation of rail control, need cut apart 2 wave detector is set respectively on the detecting device.
And, in above-mentioned known techniques, be that diffused light is assumed to the DC light with signal content, and the top envelope signal is detected, and envelope signal above from the signal of sub-detecting device, deducting, but consider the also overlapping signal content that has to a certain degree in the diffused light, the method for envelope signal might be eliminated accurately and depart from composition above utilizing.
Summary of the invention
The objective of the invention is to, a kind of tracking controller of new structure is provided and possesses the compact disc device of this device, technical matters to be solved provide a kind of can eliminate because of multilayer optical disc diffused light caused departs from composition, and the device of rail error signal is sought in generation accurately, and a kind of device that can seek rail control by this accurately is provided, thereby is suitable for practicality more.
The invention provides a kind of by laser light being divided into main beam and 2 beamlets totally 3 light beams, and the reflected light from multilayer optical disc of main beam is subjected to light with primary detector, and the reflected light from laser disc of 2 beamlets is subjected to light with the 1st sub-detecting device and the 2nd sub-detecting device respectively, and the signal from aforementioned primary detector, the 1st and the 2nd sub-detecting device carried out computing, seek the tracking controller of rail error signal and generate; It comprises: a diffused light detecting device is arranged at respectively near the aforementioned the 1st sub-detecting device and the aforementioned the 2nd sub-detecting device; An and arithmetic unit, by the difference of the signal of the signal of aforementioned the 1st sub-detecting device of computing and aforementioned diffused light detecting device and eliminate that included diffused light departs from composition in the aforementioned the 1st sub-detecting device, and by the difference of the signal of the signal of aforementioned the 2nd sub-detecting device of computing and aforementioned diffused light detecting device and eliminate that included diffused light departs from composition in the aforementioned the 2nd sub-detecting device, and then generate the aforementioned rail error signal of seeking.And the present invention is also applicable to the tracking controller of 1 light beam mode.That is, the invention provides and a kind ofly will be subjected to light with detecting device, and generate according to signal and to seek the tracking controller of rail error signal from aforesaid detector from the reflected light of multilayer optical disc; It comprises: a diffused light detecting device, be arranged on aforesaid detector near; And an arithmetic unit, by the difference of the signal of the signal of its computing aforesaid detector and aforementioned diffused light detecting device, included diffused light departs from composition in the aforesaid detector and eliminate.
And, the invention provides a kind of compact disc device, comprising: tracking controller as described above; And one seek the rail hunting gear, its according to from aforementioned tracking controller seek the rail error signal, carry out servo-actuated control to the optical picking-up head (pick-up) of aforementioned multilayer optical disc irradiating laser light.
In the present invention, by to diffused light, promptly in multilayer optical disc because of from except the layer that should write down or reduce layer reflected light caused departs from, utilize the diffused light detecting device to detect, and the signal that this diffused light detecting device is detected deducts respectively from the 1st and the 2nd sub-detecting device, included diffused light departs from composition in the 1st and the 2nd sub-detecting device and eliminate, and then generation is not subjected to diffused light to depart from the high-precision rail error signal of seeking of the influence of composition.Because diffused light detecting device and the 1st and the 2nd sub-detecting device is neighbouring in abutting connection with configuration, so by the suffered diffusion of light light intensity of the 1st and the 2nd sub-detecting device with by the suffered diffusion of light light intensity of diffused light detecting device roughly the same (local identical), therefore by the signal that from the signal of the 1st and the 2nd sub-detecting device, deducts the diffused light detecting device respectively, even diffusion light intensity integral body is inhomogeneous, or signal content is overlapping, also can positively eliminate diffused light and depart from composition.Even under the situation of 1 light beam, also can depart from composition, and from the signal of detecting device, deduct and eliminate diffused light included in the detecting device and depart from composition by utilizing near disposed the detecting device diffused light detecting device to detect diffused light.Cutting apart in the detecting device of detecting device formation with 4, and employing phase difference method, the phase differential that promptly utilizes its 2 diagonal sum signals is the direction that magnetic track departed from and the method for measuring the principle that changes according to laser light, seek in generation under the situation of rail error signal, by disposing the diffused light detecting device 4 respectively near cutting apart each detecting device of detecting device, the diffused light that can positively eliminate each detecting device departs from composition.
To the configuration of the diffused light detecting device of the 1st sub-detecting device, and be arbitrarily to the configuration of the diffused light detecting device of the 2nd sub-detecting device, key is that it gets final product in abutting connection with configuration with near the of sub-detecting device, no matter and it is separated from one another or contact.Primary detector, the 1st, the 2 sub-detector configurations are on the direction vertical to the track width direction, but the diffused light detecting device is to for example the 1st sub-detecting device, it can be carried out clamping form and in its both sides in abutting connection with configuration.To detecting device under the 1 light beam situation and diffused light detecting device also is same.To cut apart detecting device be the 1st detecting device, the 2nd detecting device, the 3rd detecting device, the 4th detecting device if make 4, then can be respectively in abutting connection with configuration 1 or a plurality of diffused light detecting device near the 1st～the 4th detecting device.
And the 2nd of the present invention provides a kind of reflected light from multilayer optical disc is subjected to light with detecting device, and generates according to the signal from aforesaid detector and to seek the tracking controller of rail error signal; By a diffused light detecting device being set near aforesaid detector and aforesaid detector and aforementioned diffused light detecting device being connected in series, and the aforesaid detector that is connected in series and an end of aforementioned diffused light detecting device are connected on the power supply, and with other end ground connection, and take out output from the tie point of aforesaid detector and aforementioned diffused light detecting device, depart from composition thereby eliminate the included diffused light of aforesaid detector.
As utilize the present invention, add the easy diffused light detecting device of a kind of formation by paying, can eliminate because of diffused light, promptly from multilayer optical disc except the layer that should write down or reduce layer reflected light caused departs from, and obtain the high-precision rail error signal of seeking.
The present invention compared with prior art has tangible advantage and beneficial effect.Via as can be known above-mentioned, the invention relates to a kind of tracking controller and possess the compact disc device of this device, in record/reduction, can eliminate departing from of causing because of diffused light, and generate and seek the rail error signal multilayer optical disc.This tracking controller utilizes differential recommending (DPP) method and phase difference method to generate and seeks the rail error signal.It comprises accepts main beam respectively, the 1st beamlet, catoptrical primary detector the 10, the 1st sub-detecting device the 12, the 2nd sub-detecting device 14 of these 3 light beams of the 2nd beamlet.In the both sides of the 1st sub-detecting device 12 with diffused light detecting device 13a, 13b in abutting connection with configuration, and in the both sides of the 2nd sub-detecting device 14 with diffused light detecting device 15a, 15b in abutting connection with configuration.The included diffused light of detecting device 12a of the 1st sub-detecting device 12 is departed from composition, utilize the signal of diffused light detecting device 13a to eliminate, and the included diffused light of detecting device 12b of the 1st sub-detecting device 12 is departed from composition, utilize the signal of diffused light detecting device 13b to eliminate.
Above-mentioned explanation only is the general introduction of technical solution of the present invention, for can clearer understanding technological means of the present invention, and can be implemented according to the content of instructions, and for above-mentioned and other purposes, feature and advantage of the present invention can be become apparent, below especially exemplified by preferred embodiment, and conjunction with figs., be described in detail as follows.
Description of drawings
Fig. 1 is the configuration instruction figure of the detecting device of example.
Fig. 2 is the diffused light detecting device of example and the configuration instruction figure of diffused light.
Fig. 3 is the distribution key diagram of the detecting device of example.
Fig. 4 is the distribution key diagram of the detecting device of conventional devices.
Fig. 5 is another distribution key diagram of the detecting device of example.
Fig. 6 is the diffused light detector configurations key diagram of example.
Fig. 7 is another configuration instruction figure of the diffused light detecting device of example.
Fig. 8 is the another other configuration instruction figure of the diffused light detecting device of example.
Fig. 9 is the another other configuration instruction figure of the diffused light detecting device of example.
Figure 10 is 3 light beam key diagrams of DPP method.
Figure 11 seeks rail error signal generative circuit figure for the DPP method.
Figure 12 is the reflected light key diagram under the situation that does not have diffused light.
Figure 13 is the reflected light key diagram that exists under the situation of diffused light.
Figure 14 is another configuration instruction figure of the diffused light detecting device of example.
Figure 15 is the key diagram (its 1) of phase difference method.
Figure 16 is the key diagram (its 2) of phase difference method.
Figure 17 is the key diagram (its 3) of phase difference method.
Figure 18 is the another other configuration instruction figure of the diffused light detecting device of example.
Figure 19 is the detector configurations key diagram about the 2nd working of an invention form.
Figure 20 is the primary detector of Figure 19 and the circuit diagram of diffused light detecting device.
Figure 21 is the sub-detecting device of Figure 19 and the circuit diagram of diffused light detecting device.
5: information pothole 10:2 is cut apart detecting device (primary detector)
11: diffused light detecting device 12:2 is cut apart detecting device (the 1st sub-detecting device)
12a, 12b: detecting device 13,13a, 13a1,13a2: diffused light detecting device
13b, 13b1,13b2: diffused light detecting device
14:2 is cut apart detecting device (the 2nd sub-detecting device)
14a, 14b: detecting device 15,15a, 15b: diffused light detecting device
16: difference engine 17: the diffused light detecting device
18: difference engine 19: the diffused light detecting device
20: difference engine 21: the diffused light detecting device
22: totalizer 24: difference engine
28: amplifier 100: main beam
102,104: beamlet 200,202,204,300: reflected light
A, b, c, d, e, f, g, h, e1, e2: detecting device
F1, f2, g1, g2, h1, h2: detecting device
A1, a2, b1, b2, c1, c2, d1, d2: diffused light detecting device
Ia, ia1, ie, ie1, ie2: electric current
MPP: promote mainly and draw signal
1SPP: the 1st sub-push-pull signal
2SPP: the 2nd sub-push-pull signal
TE: seek the rail error signal
S1, S2, S3, S4: the signal of diffused light detecting device 13a, 13b, 15a, 15b
S5, S6: the signal of detecting device
Sa1, Sa2, Sa3, Sa4: the signal of detecting device 13a1,13a2,13b1,13b2
Vcc: supply voltage
ε 1, ε 2, ε 3, ε 4: depart from composition
Embodiment
Reach technological means and the effect that predetermined goal of the invention is taked for further setting forth the present invention, below in conjunction with accompanying drawing and preferred embodiment, tracking controller that foundation the present invention is proposed and its embodiment of compact disc device, structure, feature and the effect thereof that possesses this device, describe in detail as after.
Below, according to diagram example of the present invention is described.In addition, it is well-known that the integral body of compact disc device constitutes, and also has illustrated in above-mentioned known techniques for example.Promptly, with the position of multilayer optical disc subtend on optical picking-up head is set, and make form parallel beam from the laser beam of laser diode (laser diode) with collimator lens (collimate lens) after, utilize diffraction grating (diffraction grating) to be separated into main beam and 2 beamlets.3 light beams pass through beam splitter (beam splitter) and object lens, the enterprising line focusing of layer that should write down or reduce in the plural layer of multilayer optical disc., and utilize condenser to carry out optically focused and shine on the detecting device through object lens and beam splitter and the incident condenser from the reflected light of the layer that should write down or reduce.Detecting device as shown in figure 11, have primary detector 10 and the 1st sub-detecting device the 12, the 2nd detecting device 14, and utilize primary detector 10 to accept the reflected light of main beam 100 and be converted to 2 signals of P signal and n-signal, utilize the 1st detecting device 12 to accept the reflected light of the 1st beamlet 102 and be converted to P signal and 2 signals of n-signal, utilize the 2nd detecting device 14 to accept the reflected light of the 2nd beamlet 104 and be converted to 2 signals of P signal and n-signal.Signal from 3 detecting devices 10,12,14 utilizes difference engine 16,18,20 with the computing difference respectively, and is fed into totalizer 22 and difference engine 24 as push-pull signal.Totalizer 22 and difference engine 24 utilize the computing of DPP method according to above-mentioned formula (1), generate and seek the rail error signal.The rail error signal of seeking that generates is fed into and seeks rail servo-actuated circuit, utilizes to eliminate and seeks the rail error and optical picking-up head is carried out servo-actuated control.
Figure 1 shows that the formation of the detecting device of this example.Different with the formation of Figure 11 or the detecting device that utilizes known DPP method shown in Figure 12, near the 1st sub-detecting device 12, diffused light detecting device 13a, 13b are set, and near the 2nd sub-detecting device 14, also are provided with diffused light detecting device 15a, 15b.Diffused light detecting device 13a and 13b are configured on the position corresponding with the track width direction (video disc radial direction) of the 1st sub-detecting device 12, and are configured near its both sides with the form of clamping the 1st sub-detecting device 12.Diffused light detecting device 15a and 15b also are configured on the position corresponding with the track width direction of the 2nd sub-detecting device 14, and are configured near its both sides with the form of clamping the 2nd sub-detecting device 14.The light-receiving area of diffused light detecting device 13a, 13b is equal to each other, and equates with 2 light-receiving areas of cutting apart detecting device that constitute the 1st sub-detecting device 12.In diagram, diffused light detecting device 13a, 13b separate setting with the 1st sub-detecting device 12, but may not separate setting, also can contact setting with the 1st sub-detecting device 12.The distance of diffused light detecting device 13a, 13b and the 1st sub-detecting device 12 is more little appropriate more.Also can make the 1st sub-detecting device 12 for carry out along the track width direction 4 cut apart 4 cut apart detecting device, and 2 detecting devices of central authorities are played a role as the 1st known sub-detecting device 12, and the detecting device on both sides are played a role as diffused light detecting device 13a, 13b.Diffused light detecting device 15a, 15b also are same, and the light-receiving area of diffused light detecting device 15a, 15b is equal to each other, and equate with 2 light-receiving areas of cutting apart detecting device that constitute the 2nd sub-detecting device 14.Also can not make diffused light detecting device 15a, 15b separate setting, and contact setting with the 2nd sub-detecting device 14 with the 2nd sub-detecting device 14.Also can make the 2nd sub-detecting device 14 for carry out along the track width direction 4 cut apart 4 cut apart detecting device, and 2 detecting devices of central authorities are played a role as the 2nd known sub-detecting device 14, and the detecting device on both sides are played a role as diffused light detecting device 15a, 15b.
Figure 2 shows that each detecting device under the situation of the diffused light 300 that has main beam 100 and the relation of diffused light 300.Diffused light detecting device 13a, 13b are configured near the 1st sub-detecting device 12, and have identical light-receiving area with the 1st sub-detecting device 12, so it accepts to cut apart the intensity of the diffused light 300 that detecting device institute accepts respectively roughly with the light of measuring with 2 of the 1st sub-detecting device 12.Here, even the intensity of diffused light 300 changes on the track width direction, the light income of a detecting device of diffused light detecting device 13a and the 1st sub-detecting device 12 (being referred to as detecting device 12a) is also roughly the same, and the light income of the b detecting device (being referred to as detecting device 12b) of diffused light detecting device 13b and the 1st sub-detecting device 12 also becomes roughly the same.Therefore, by the signal that from the signal of detecting device 12a, deducts diffused light detecting device 13a, can eliminate because of what the diffused light 300 that comprises among the detecting device 12a was caused and depart from composition.And, by the signal that from the signal of detecting device 12b, deducts diffused light detecting device 13b, can eliminate because of what the diffused light 300 that comprises among the detecting device 12b was caused and depart from composition.
Equally, diffused light detecting device 15a, 15b are configured near the 2nd sub-detecting device 14, and have identical light-receiving area with the 2nd sub-detecting device 14, so it accepts to cut apart the intensity of the diffused light 300 that detecting device institute accepts respectively roughly with the light of measuring with 2 of the 2nd sub-detecting device 14.Even the intensity of diffused light 300 changes on the track width direction, the light income of a detecting device of diffused light detecting device 15a and the 2nd sub-detecting device 14 (being referred to as detecting device 14a) is also roughly the same, and the light income of the b detecting device (being referred to as detecting device 14b) of diffused light detecting device 15b and the 2nd sub-detecting device 14 also becomes roughly the same.Therefore, by the signal that from the signal of detecting device 14a, deducts diffused light detecting device 15a, can eliminate because of what the diffused light 300 that comprises among the detecting device 14a was caused and depart from composition.And, by the signal that from the signal of detecting device 14b, deducts diffused light detecting device 15b, can eliminate because of what the diffused light 300 that comprises among the detecting device 14b was caused and depart from composition.
Promptly, as the signal of establishing self-detector 12a, 12b is respectively 1SPP (P), 1SPP (N), come the signal of self-detector 14a, 14b to be respectively 2SPP (P), 2SPP (N), come the signal of self-detector 10a, 10b to be respectively MPP (P), MPP (N), then because
MPP＝MPP(P)-MPP(N)
1SPP=1SPP (P)-1SPP (N)
2SPP=2SPP (P)-2SPP (N),
So (1) formula is
TE={MPP (P)-MPP (N) }-k{ (1SPP (P)-1SPP (N))+(2SPP (P)-2SPP (N)) }
={ MPP (P)-MPP (N) }-k{ (1SPP (P)+2SPP (P))-(1SPP (N)+2SPP (N)) } ... (2).
The 2nd on the right is
The right the 2nd=-k{ (1SPP (P)+2SPP (P))-(1SPP (N)+2SPP (N))
＝-k(A-B) …(3)。
Here,
A=1SPP (P)+2SPP (P)
B=1SPP (N)+2SPP (N).
As make diffused light detecting device 13a, 13b, 15a, the signal of 15b is respectively S1, S2, S3, S4, then the composition ε 1 that departs from that diffused light 300 caused that comprises of 1SPP (P) eliminates by 1SPP (P)-S1, the composition ε 2 that departs from that diffused light 300 caused that 1SPP (N) comprises eliminates by 1SPP (N)-S2, the composition ε 3 that departs from that diffused light 300 caused that 2SPP (P) comprises eliminates by 2SPP (P)-S3, the composition ε 4 that departs from that diffused light 300 caused that 2SPP (N) comprises eliminates by 2SPP (P)-S4, so seek rail error signal TE is
TE={MPP (P)-MPP (N) }-k{ (1SPP (P)-S1-1SPP (N)+S2)+(2SPP (P)-S3-2SPP (N)+S4) } ... (4).
The 2nd on the right is
The right the 2nd=-k{ (1SPP (P)+2SPP (P)+S2+S4)-(1SPP (N)+2SPP (N)+S1+S3) }
＝-k(X-Y) …(5)。
But,
X=1SPP (P)+2SPP (P)+S2+S4=A+S2+S4
Y=1SPP (N)+2SPP (N)+S1+S3=B+S1+S3 ... (6).
Like this, even in this example, the light intensity of diffused light 300 is inhomogeneous, and its depart from ε 1, ε 2, ε 3, ε 4 differ from one another, also can eliminate these and depart from.And, overlapping even signal content carries out in diffused light 300 since in S1, S2, S3, S4 overlapped signal composition similarly, depart from so can positively eliminate.
In addition,, depart from, but this departs from by adjusting coefficient k and can eliminate so in the signal MPP of primary detector 10, also contain owing to diffused light 300 also incident primary detector 10.Certainly, also can adopt the diffused light detecting device is set near primary detector 10, and eliminate the formation that departs from.That is, diffused light detecting device 11a, 11b are set near the both sides of primary detector 10, and with the signal of these detecting devices respectively as S5, S6, utilize MPP (P)-S5, MPP (N)-S6 to eliminate and depart from.
And, by formula (5) as can be known, the 2nd on the right of the DPP method of this example is to the 2nd on the right of known DPP method, form identical shape in form by satisfying the such relation of formula (6), so the circuit formation can be quoted also and known identical circuit constitutes.
Figure 3 shows that the wiring diagram of the detecting device of this example, Figure 4 shows that the wiring diagram of the detecting device of the conventional devices that is used for comparison.At first, conventional devices is described, because the 2nd on the right can be calculated by A-B, and A=1SPP (P)+2SPP (P), B=1SPP (N)+2SPP (N), so, detecting device 12b is connected with detecting device 14b and synthetic two signals and output to difference engine as the B signal and get final product as long as detecting device 12a is connected with detecting device 14a and synthetic two signals and output to difference engine as a-signal.
On the other hand, in this example, because the 2nd on the right can be calculated by X-Y, and X=1SPP (P)+2SPP (P)+S2+S4=A+S2+S4, Y=1SPP (N)+2SPP (N)+S1+S3=B+S1+S3, so as long as the a-signal circuit of conventional devices is connected diffused light detecting device 13b, 15b and synthetic, to B signal line connection diffused light detecting device 13a, 15a and synthetic the getting final product of conventional devices.In above-mentioned Japanese documentation, need in each detecting device, wave detector be set, but in this example, add the better simply detecting device of constituent ratio by paying, and still directly quote the distribution of conventional devices, can eliminate and depart from.
Figure 5 shows that another wiring diagram of the detecting device of this example.By formula (6) as can be known, the 2nd on the right can
X=1SPP (P)+2SPP (P)+S2+S4
={ 1SPP (P)+S2}+{ 2SPP (P)+S4}
＝P+Q
Y=1SPP (N)+2SPP (N)+S1+S3
={ 1SPP (N)+S1}+{ 2SPP (N)+S3}
＝R+S
Represent, so detecting device 12a be connected with diffused light detecting device 13b and export as the P signal, detecting device 14a is connected with diffused light detecting device 15b and exports as Q signal, detecting device 12b is connected with diffused light detecting device 13a and as the output of R signal, detecting device 14b is connected with diffused light detecting device 15a and exports and get final product as the S signal.P signal and Q signal are fed into totalizer and carry out additive operation, and R signal and S signal also are fed into totalizer and carry out additive operation.Then, two signals are fed into difference engine, carry out calculus of differences.
More than be illustrated about example of the present invention, but the present invention is not limited thereto, and also can carry out various distortion.
For example, in this example, as shown in Figure 6, track width direction (being left and right directions in diagram) both sides at the 1st sub-detecting device 12 are provided with diffused light detecting device 13a, 13b, but also can be as shown in Figure 7, to the 1st sub-detecting device 12, the both sides in the pairing position of the direction vertical with the track width direction (being above-below direction in diagram) are provided with diffused light detecting device 13a, 13b.Specifically, as shown in Figure 7, diffused light detecting device 13a is made of diffused light detecting device 13a1 and these two detecting devices of 13a2, and being configured up and down at detecting device 12a.The light-receiving area of detecting device 13a1,13a2 is respectively half of light-receiving area of detecting device 12a.Equally, diffused light detecting device 13b is made of diffused light detecting device 13b1 and these two detecting devices of 13b2, and being configured up and down at detecting device 12b.The light-receiving area of detecting device 13b1,13b2 is respectively half of light-receiving area of detecting device 12b.As the signal that makes detecting device 13a1,13a2,13b1,13b2 is respectively Sa1, Sa2, Sa3, Sa4, then because of departing from that the diffused light 300 that comprises among the detecting device 12a is caused, utilize 1SPP (P)-(Sa1+Sa2) to be eliminated, because of departing from that the diffused light 300 that comprises among the detecting device 12b is caused, utilize 1SPP (N)-(Sa3+Sa4) be eliminated.About the distribution aspect, analogize by Fig. 3 or Fig. 5, as long as detecting device 12a is connected with diffused light detecting device 13b1,13b2, and detecting device 12b1 is connected with diffused light detecting device 13a1,13a2 gets final product.
And, as shown in Figure 8, also can and all dispose the diffused light detecting device about the 1st sub-detecting device 12 up and down.That is, diffused light detecting device 13a1,13a2,13b1,13b2 are configured up and down as shown in Figure 7, diffused light detecting device 13a3,13b3 are configured about as shown in Figure 6.In this case, employing to the diffused light detecting device that utilizes configuration up and down eliminate depart from seek the rail error signal, eliminate the rail error signal of seeking that departs from the diffused light detecting device of configuration about utilization and compare, and it is comparatively appropriate to choose the formation that departs from a littler side.
In addition, also can be as shown in Figure 9, make square or the rhombuses of the 1st sub-detecting device 12 for 45 degree that only tilt, and with its 4 limit respectively the form of subtend dispose leg-of-mutton diffused light detecting device 13a1,13a2,13b1,13b2.In this case, the diffused light detecting device also can dispose with near adjacency the 1st sub-detecting device 12.As being benchmark, we can say also that then the diffused light detecting device is to be configured in the track width direction is become on the direction of 45 degree with track width direction (left and right directions among the figure).The light-receiving area of diffused light detecting device 13a1,13a2 equates, and is respectively light-receiving area only about half of of detecting device 12a.The light-receiving area of diffused light detecting device 13b1,13b2 also equates, and is respectively light-receiving area only about half of of detecting device 12b.Diffused light detecting device 13a1,13a2 are the detecting device that departs from that is used to eliminate detecting device 12a, and diffused light detecting device 13b1,13b2 are the detecting device that departs from composition that is used to eliminate detecting device 12b.The configuration of Fig. 9 also can be described as a kind of possess simultaneously Fig. 6 about the configuration of character of the diffused light detecting device of configuration up and down of configuration and Fig. 7, also help to improve the space efficiency of detector region.The distribution of Fig. 9 is that detecting device 12a is connected with diffused light detecting device 13b1,13b2, and detecting device 12b is connected with diffused light detecting device 13a1,13a2.
In Fig. 6～Fig. 9, be to be illustrated, but, also can adopt same configuration certainly the 2nd sub-detecting device 14 about the 1st sub-detecting device 12.
In this above example, be about utilize main beam and 2 beamlets totally 3 light beams generate the situation of seeking the rail error signal and be illustrated, but equally also applicable to only utilizing 1 light beam to generate the situation of seeking the rail error signal.
For example, suppose a kind ofly will be subjected to light with primary detector 10, and be used to push-pull signal, generate the situation of seeking the rail error signal from the signal of this primary detector 10 from the reflected light of 1 light beam.Figure 14 shows that 4 cut apart primary detector 10 and near the diffused light detecting device that disposes thereof.4 cut apart primary detector is split into a～d totally 4 detecting devices, as the signal of establishing from each detecting device is a～d, then can obtain push-pull signal by (a+d)-(b+c).At the diffused light of configuration up and down detecting device a1, d1, b1, the c1 of primary detector 10, and about primary detector 10, dispose a2, d2, b2, c2.Corresponding with formation shown in Figure 8, the diffused light of the detecting device a of primary detector 10 departed from utilize diffused light detecting device a1, a2 to detect, the diffused light of the detecting device b of primary detector 10 departed from utilize diffused light detecting device b1, b2 to detect, the diffused light of the detecting device c of primary detector 10 departed from utilize diffused light detecting device c1, c2 to detect, the diffused light of the detecting device d of primary detector 10 is departed from utilize diffused light detecting device d1, d2 to detect.That is, come that included diffused light departs among the signal a of self-detector a, can utilize
a-(a1+a2)
And be eliminated, coming that included diffused light departs among the signal b of self-detector b, can utilize
b-(b1+b2)
And be eliminated, coming that included diffused light departs among the signal c of self-detector c, can utilize
c-(c1+c2)
And be eliminated, coming that included diffused light departs among the signal d of self-detector d, can utilize
d-(d1+d2)
And be eliminated.Certainly, also can utilize according to the ratio of the light-receiving area of the light-receiving area of detecting device a and detecting device (a1+a2)
a-k(a1+a2)
(but k is for utilizing the determined coefficient of area ratio) eliminated diffused light and departed from.
Because push-pull signal can be obtained by (a+d)-(c+d), so can be as shown in figure 14, connection detector a, d, (b1+b2), (c1+c2) also carry out additive operation and form a-signal, connection detector b, c, (a1+a2), (d1+d2) also carry out additive operation and form the B signal, and utilize A-B to obtain push-pull signal.
And, equally also, generate the situation of seeking the rail error signal by the phase difference method that utilizes 1 light beam applicable to as DVD-ROM etc.Phase difference method also is well-known, and the 4 light light quantities that respectively are subjected to of cutting apart detecting device change according to the amount and the directions that depart from from track center, so be the phase place of the comparison 4 diagonal sum signal of cutting apart detecting device and generate and seek the rail error signal.
Being subjected to light pattern and being subjected to light signal of the phase difference method that Figure 15～Figure 17 shows that utilizes the spy of Japanese Patent Laid Open Publication for example to open to be disclosed in the 2003-30879 communique.Figure 15 is the situation at center of the folded light beam 200 trace information potholes (pit) 5 of 1 light beam, in this case, because changed by the light pattern left and right symmetrically, so 2 diagonal sum signals (a+c) are consistent with the phase place of (b+d).Figure 16 is the situation that 200 pairs of information potholes 5 of folded light beam of 1 light beam depart to the right, in this case, changed with the form that is rotated in a clockwise direction by light pattern, 2 diagonal sum signals (a+c) are different with the phase place of (b+d), and (a+c) phase place of signal only postpones side-play amount.And, Figure 17 is the situation that 200 pairs of information potholes 5 of folded light beam of 1 light beam depart from left, and in this case, the form that rotated in a counter-clockwise direction by light pattern changes, 2 diagonal sum signals (a+c) are different with the phase place of (b+d), (a+c) phase place of a signal advance offset amount.Therefore, by with 2 diagonal sum signal binaryzations, and detected phase is poor respectively, can generate and seek the rail error signal.
Figure 18 shows that the configuration of the primary detector 10 of phase difference method and diffused light detecting device and be connected.The configuration of diffused light detecting device is identical with configuration shown in Figure 14.Come that included diffused light departs among the signal a of self-detector a, can utilize
a-(a1+a2)
And be eliminated, coming that included diffused light departs among the signal b of self-detector b, can utilize
b-(b1+b2)
And be eliminated, coming that included diffused light departs among the signal c of self-detector c, can utilize
c-(c1+c2)
And be eliminated, coming that included diffused light departs among the signal d of self-detector d, can utilize
d-(d1+d2)
And be eliminated.
In phase difference method, because the signal (a+c) of diagonal sum, the phase place of (b+d) are compared, so detecting device a, c connected and export as a-signal, detecting device b, d are connected and export as the B signal, and diffused light detecting device a1, a2, c1, c2 are connected and they are carried out additive operation and form the C signal, and from a-signal, deduct, diffused light detecting device b1, b2, d1, d2 are connected and they are carried out additive operation and form the D signal, and from the B signal, deduct.Compare by phase differential A-C signal and B-D signal, can generate eliminated influence that diffused light departs from seek the rail error signal.In Figure 14 or Figure 18, also these two diffused light detecting devices of a1, a2 can be set near detecting device a certainly, and only dispose a1 or only dispose a2.Detecting device b～d to other also is same.
Figure 19～shown in Figure 21 is the 2nd working of an invention form.Near primary detector the 10, the 1st sub-detecting device the 12, the 2nd sub-detecting device 14, dispose the diffused light detecting device respectively.That is, near configuration diffused light detecting device 11,13 primary detector 10, near configuration diffused light detecting device 15,17 the 1st sub-detecting device 12, near configuration diffused light detecting device 19,21 the 2nd sub-detecting device 14.Primary detector 10 is cut apart photodetector by 4 and is constituted, as establishes them and be a, b, c, d, and then diffused light detecting device 11 is configured near detecting device a, the b of primary detector 10.They are called diffused light detecting device a1, b1 respectively.And diffused light detecting device 13 is configured near detecting device c, the d of primary detector 10.They are called diffused light detecting device c1, d1 respectively.Utilize diffused light detecting device a1 to detect included diffused light composition among the detecting device a, utilize diffused light detecting device b1 to detect included diffused light composition among the primary detector b, utilize diffused light detecting device c1 to detect included diffused light composition among the detecting device c, utilize diffused light detecting device d1 to detect included diffused light composition among the primary detector d.
Equally, the 1st sub-detecting device 12 is made of detecting device e, f, and to detecting device e, detecting device e1, the e2 of diffused light detecting device 15,17 detect the diffused light composition of detecting device e, to detecting device f, detecting device f1, the f2 of diffused light detecting device 15,17 detect the diffused light composition of detecting device f.And, the 2nd sub-detecting device 14 is made of detecting device g, h, and to detecting device g, detecting device g1, the g2 of diffused light detecting device 19,21 detect the diffused light composition of detecting device g, to detecting device h, detecting device h1, the h2 of diffused light detecting device 19,21 detect the diffused light composition of detecting device h.
Figure 20 shows that the circuit diagram of distribution state of the detecting device a1 of the detecting device a of primary detector 10 and diffused light detecting device 11.The negative electrode of detecting device a is connected on the power source voltage Vcc, and the anode of detecting device a is connected on the negative electrode of detecting device a1.The anode of detecting device a1 is grounded.That is, detecting device a and detecting device a1 are connected in series.And, take out the output line of detecting device a from the tie point of detecting device a and detecting device a1.In detecting device a, except original main beam, also include diffused light, and in detecting device a, flow through the current i a corresponding with these light quantities.On the other hand, in detecting device a1, flow through the current i a1 corresponding with the light quantity of diffused light.Therefore, the output line that the tie point from detecting device a and detecting device a1 takes out, flow through formation
Ia=i master+i diffused light
The ia1=i diffused light
I=ia-ia1=i master
Current i, the detection electric current of having eliminated the diffused light composition is output.Here, the i electric current is the detection electric current according to main beam, and the i diffused light is the detection electric current according to the diffused light composition.The distribution relation of detecting device b and detecting device b1, detecting device c and detecting device c1, detecting device d and detecting device d1, be identical also with detecting device a shown in Figure 20 and the relation of detecting device a1, therefore, the electric current of exporting from each tie point forms a detection electric current according to main beam of whole elimination diffused light compositions.Therefore, these can be detected electric current directly utilizes known circuit formation shown in Figure 11 to handle.Promptly, need only the output (output that utilizes detecting device a1 that the diffused light composition is eliminated) of self-detector a in future and come the signal of output (output that utilizes detecting device d1 that the diffused light composition is eliminated) sum of self-detector d, reach the output (output that utilizes detecting device b1 that the diffused light composition is eliminated) of self-detector b in future and come the signal of output (output that utilizes detecting device c1 that the diffused light composition is eliminated) sum of self-detector c, output to difference engine 16 respectively and get final product.
On the other hand, shown in Figure 21 is the circuit diagram of distribution state of detecting device e1, the e2 of the detecting device e of the 1st sub-detecting device 12 and diffused light detecting device 15,17.The negative electrode of detecting device e is connected with supply voltage Vec, and the anode of detecting device e is connected jointly with the negative electrode of detecting device e1, e2.The anode of detecting device e1, e2 is grounded.That is, detecting device e1, e2 are connected in parallel with each other, and detecting device e1, the e2 and the detecting device e that connect side by side each other are connected in series.And, take out the output line of detecting device e from the tie point of detecting device e and detecting device e1, e2.In detecting device e, except original main beam, also include diffused light, and in detecting device e, flow through the current i e corresponding with these light quantities.On the other hand, in detecting device e1, e2, flow through the current i e1 corresponding, ie2 with the light quantity of diffused light.Therefore, the output line that the tie point from detecting device e and detecting device e1, e2 takes out, flow through formation
Ie=i master+i diffused light
Ie1=i diffused light (1 part wherein)
Ie2=i diffused light (wherein rest parts)
I=ie-(ie1+ie2)=i master
Current i, the detection electric current of having eliminated the diffused light composition is output.Detecting device f and detecting device f1, distribution relation, detecting device g and the detecting device g1 of f2, the distribution relation of distribution relation, detecting device h and detecting device h1, the h2 of g2, be identical also with relation shown in Figure 21, therefore, the electric current of exporting from each tie point forms a detection electric current according to main beam of whole elimination diffused light compositions.Therefore, these can be detected electric current directly utilizes known circuit formation shown in Figure 11 to handle.Promptly, the output (output that utilizes detecting device e1, e2 that the diffused light composition is eliminated) of self-detector e in the future and come the output (output that utilizes detecting device f1, f2 that the diffused light composition is eliminated) of self-detector f to output to difference engine 18, the output (output that utilizes detecting device g1, g2 that the diffused light composition is eliminated) of self-detector g in the future and come the output (output that utilizes detecting device h1, h2 that the diffused light composition is eliminated) of self-detector h to output to difference engine 20.So, can eliminate diffused light composition and generate and to seek the rail error signal.
In the example of Figure 19～shown in Figure 21, because the influence of adjoining course is eliminated at the output stage of detecting device, so can eliminate influence to servomechanism integral body.Even to AGC (Auto Gain Control, the automatic gain control) circuit of the servomechanism of moving with signal of for example utilizing detecting device and since with signal in do not comprise the diffused light composition, so its action is carried out effectively.
The above, it only is preferred embodiment of the present invention, be not that the present invention is done any pro forma restriction, though the present invention discloses as above with preferred embodiment, yet be not in order to limit the present invention, any those skilled in the art, in not breaking away from the technical solution of the present invention scope, when the structure that can utilize above-mentioned announcement and technology contents are made a little change or be modified to the equivalent embodiment of equivalent variations, but every content that does not break away from technical solution of the present invention, according to technical spirit of the present invention to any simple modification that above embodiment did, equivalent variations and modification all still belong in the scope of technical solution of the present invention.
Claims (10)
1, a kind of tracking controller, for a kind of by laser light being divided into main beam and 2 beamlets totally 3 light beams, and the reflected light from multilayer optical disc of main beam is subjected to light with primary detector, and the reflected light from other layer laser disc of 2 beamlets is subjected to light with the 1st sub-detecting device and the 2nd sub-detecting device respectively, and the signal from aforementioned primary detector, the 1st and the 2nd sub-detecting device carried out computing, seek the tracking controller of rail error signal and generate; Be characterised in that it comprises:
One diffused light detecting device is arranged at respectively near the aforementioned the 1st sub-detecting device and the aforementioned the 2nd sub-detecting device, and accepts the diffused light from aforementioned laser disc; And
One arithmetic unit, by the difference of the signal of the signal of aforementioned the 1st sub-detecting device of computing and aforementioned diffused light detecting device and eliminate that included diffused light departs from composition in the aforementioned the 1st sub-detecting device, and by the difference of the signal of the signal of aforementioned the 2nd sub-detecting device of computing and aforementioned diffused light detecting device and eliminate that included diffused light departs from composition in the aforementioned the 2nd sub-detecting device, and then generate the aforementioned rail error signal of seeking.
2, tracking controller according to claim 1 is characterized in that:
Aforementioned arithmetic unit utilizes differential recommending (push-pull) method to generate the aforementioned rail error signal of seeking.
3, tracking controller according to claim 1 is characterized in that:
The both sides of aforementioned diffused light detecting device and aforementioned the 1st sub-detecting device are in abutting connection with configuration, and with the both sides of aforementioned the 2nd sub-detecting device in abutting connection with configuration.
4, tracking controller according to claim 3 is characterized in that:
Aforementioned diffused light detecting device is the adjacency configuration on the track width direction of aforementioned the 1st sub-detecting device, and adjacency configuration on the track width direction of aforementioned the 2nd sub-detecting device.
5, tracking controller according to claim 3 is characterized in that:
Aforementioned diffused light detecting device is the adjacency configuration on the direction vertical with the track width direction of aforementioned the 1st sub-detecting device, and adjacency configuration on the direction vertical with the track width direction of aforementioned the 2nd sub-detecting device.
6, tracking controller according to claim 3 is characterized in that:
Aforementioned diffused light detecting device becomes adjacency configuration on 45 directions of spending in the track width direction to aforementioned the 1st sub-detecting device, and becomes on 45 directions of spending in abutting connection with disposing in the track width direction to aforementioned the 2nd sub-detecting device.
7, a kind of tracking controller is subjected to light to the reflected light from multilayer optical disc with detecting device for a kind of, and seeks the tracking controller of rail error signal according to the signal generation from aforesaid detector; Be characterised in that it comprises:
One diffused light detecting device, be arranged at aforesaid detector near, and accept diffused light from aforementioned other layer laser disc; And
One arithmetic unit departs from composition by the difference of the signal of the signal of computing aforesaid detector and aforementioned diffused light detecting device and eliminate the included diffused light of aforesaid detector.
8, tracking controller according to claim 7 is characterized in that:
Aforesaid detector is 4 to cut apart detecting device, according to the phase differential of the diagonal sum signal of each detecting device, generates the aforementioned rail error signal of seeking respectively,
Aforementioned diffused light detecting device is arranged at aforementioned 4 respectively and cuts apart near each detecting device of detecting device.
9, a kind of compact disc device is characterized in that it comprises:
As the described tracking controller of arbitrary claim in claim 1 or 7; And
One seeks the rail hunting gear, its according to from aforementioned tracking controller seek the rail error signal, the optical picking-up head of the aforementioned multilayer optical disc irradiating laser of subtend light carries out servo-actuated control.
10, a kind of tracking controller is subjected to light to the reflected light from multilayer optical disc with detecting device for a kind of, and seeks the tracking controller of rail error signal according to the signal generation from aforesaid detector; Be characterised in that:
By with near a diffused light the detecting device set aforesaid detector, accept diffused light from aforementioned laser disc;
Aforesaid detector and aforementioned diffused light detecting device are connected in series; And
The aforesaid detector that is connected in series and an end of aforementioned diffused light detecting device are connected on the power supply, and with other end ground connection, and taking out output from the tie point of aforesaid detector and aforementioned diffused light detecting device, included diffused light departs from composition in the aforesaid detector thereby eliminate.
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| JP2004145346 | 2004-05-14 | ||
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| JP2004241302 | 2004-08-20 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7817509B2 (en) | 2007-03-19 | 2010-10-19 | Sharp Kabushiki Kaisha | Optical pickup apparatus and beam splitter |
| CN101630514B (en) * | 2008-07-15 | 2012-03-21 | 索尼株式会社 | Optical pickup and optical disk device |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3380942B2 (en) * | 1994-12-28 | 2003-02-24 | ソニー株式会社 | Optical pickup device for multilayer optical disc |
| JP2001273640A (en) * | 2000-03-28 | 2001-10-05 | Hitachi Ltd | Optical information recording/reproducing device |
| JP2002319177A (en) * | 2001-04-24 | 2002-10-31 | Hitachi Ltd | Optical head and optical disk drive |
| JP4242108B2 (en) * | 2001-06-04 | 2009-03-18 | パナソニック株式会社 | Optical pickup head and information recording / reproducing apparatus |
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- 2005-03-30 CN CNB2005100588546A patent/CN1331132C/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7817509B2 (en) | 2007-03-19 | 2010-10-19 | Sharp Kabushiki Kaisha | Optical pickup apparatus and beam splitter |
| CN101271700B (en) * | 2007-03-19 | 2011-02-09 | 夏普株式会社 | Optical pickup apparatus and beam splitter |
| CN101630514B (en) * | 2008-07-15 | 2012-03-21 | 索尼株式会社 | Optical pickup and optical disk device |
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