CN100394257C - Liquid crystal aberration correcting element - Google Patents
Liquid crystal aberration correcting element Download PDFInfo
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- CN100394257C CN100394257C CNB2004800300481A CN200480030048A CN100394257C CN 100394257 C CN100394257 C CN 100394257C CN B2004800300481 A CNB2004800300481 A CN B2004800300481A CN 200480030048 A CN200480030048 A CN 200480030048A CN 100394257 C CN100394257 C CN 100394257C
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
- G11B7/135—Means for guiding the beam from the source to the record carrier or from the record carrier to the detector
- G11B7/1392—Means for controlling the beam wavefront, e.g. for correction of aberration
- G11B7/13925—Means for controlling the beam wavefront, e.g. for correction of aberration active, e.g. controlled by electrical or mechanical means
- G11B7/13927—Means for controlling the beam wavefront, e.g. for correction of aberration active, e.g. controlled by electrical or mechanical means during transducing, e.g. to correct for variation of the spherical aberration due to disc tilt or irregularities in the cover layer thickness
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1343—Electrodes
- G02F1/134309—Electrodes characterised by their geometrical arrangement
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/15—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on an electrochromic effect
- G02F1/153—Constructional details
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F2203/00—Function characteristic
- G02F2203/18—Function characteristic adaptive optics, e.g. wavefront correction
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- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Nonlinear Science (AREA)
- General Physics & Mathematics (AREA)
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- Mathematical Physics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
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Abstract
A novel liquid crystal aberration correcting element capable of correcting aberration caused by the thickness deviation, etc. of an optical disk to thereby enhance a recording/reproducing accuracy. The liquid crystal aberration correcting element comprises liquid crystal and a plurality of electrodes facing each other across liquid crystal. A plurality of non-electrode portions (201) each free from an electrode material and in a hole shape are formed in an electrode (20), and a lens effect occurs on the inner side of a non-electrode portion (201) due to non-uniform orientation of liquid crystal when a voltage is applied. The plurality of non-electrode portions (201) are changed in size or locating interval or the both according to their positions on an electrode (20) to thereby linearly correct aberration.
Description
Technical field
The technical field of the liquid-crystal aberration correcting element of the aberration that produces when the present invention relates in optical disc apparatus, to be used to proofread and correct the recoding/reproduction by light picker.
Background technology
In the past, as carrier, the various CDs of known CD, DVD etc.Thickness deviation that these CDs are caused by rotation or bending etc. and produce aberration (distortion of focal point) are so require to proofread and correct the precision that this aberration improves recoding/reproduction.
Particularly nearest, as CD of future generation, BD (Blu-ray Disc) is noticeable.This standard is, optical source wavelength is brought up to 405nm from 650nm, and the numerical aperture of object lens (NA) is increased to 0.85 from 0.6, and surface recording density is increased to about 5 times CD of DVD in the past.Here, be inversely proportional to, be directly proportional, so the tendency that in BD, has aberration sharply to increase with the biquadratic of NA by the spherical aberration of thickness deviation generation and the wavelength of light source.Therefore, the technology of aberration correction is is more accurately researched and developed in expectation.
As the technology of proofreading and correct above-mentioned aberration, known with the mode of driver drives collimation lens and the mode of utilizing liquid-crystal aberration correcting element.
The former mode needs driver, the complexity so light picker becomes, and have not thoroughly corresponding to high-precision calibration problem.
Relative therewith, liquid-crystal aberration correcting element generally is that the dividing electrodes with liquid crystal panel is a concentric circles, and the central portion at light beam carries out different phase control with the outer edge thus.
For example, record aberration correcting element in (patent documentation 1), it comprises: first electrode layer has a plurality of electrode part of the concentric circles corresponding with the distribution of the spherical aberration that is produced by CD; The second electrode lay, mutually opposed with described first electrode layer; And liquid crystal, by described first electrode layer and the second electrode lay clamping, in the light beam that passes through, produce with the voltage respective phase that applies and change described first electrode layer and the second electrode lay.
In addition, in (patent documentation 2), record the employed light picker of multilayer disc transcriber that the multilayer disc with a plurality of recording layers is reproduced, the corrugated aberration correction parts that this light picker possesses in the light path that is configured between light source and the object lens, proofread and correct the corrugated aberration of the light that penetrates from described light source according to the recording layer of selecting; And described corrugated aberration correction parts are made of liquid crystal cell, and possess and be used to apply electrode voltage, that be split into concentric circles.
In order to carry out good correction, it is desirable applying the opposite phases ripple for the aberration that produces.Therefore, under the situation of above-mentioned liquid-crystal aberration correcting element in the past, expectation forms the electrode zone that is split into concentric circles as much as possible, still, because element generally is microminiature size (diameter 3～4mm degree), so be difficult to increase zone (being the limit about tens grades).
Therefore, the liquid-crystal aberration correcting element that can carry out linearity correction to the aberration that produces is developed in expectation.
In addition, as another problem, when utilizing liquid-crystal aberration correcting element will apply the opposite phases ripple as described above,, only be difficult to obtain the phase differential that offsets with this aberration sometimes if the aberration that produces is big.Its result exists and aberration is not proofreaied and correct problem completely fully.
Therefore, the expectation exploitation can also obtain the liquid-crystal aberration correcting element of the absolute magnitude (phase differential) of this correction fully when the aberration that takes place is carried out linear correction.
Patent documentation 1: TOHKEMY 2002-237077 communique (claim 1, section 0014)
Patent documentation 2: Japanese kokai publication hei 10-269611 communique (claim 1～4)
Summary of the invention
Therefore,, the objective of the invention is to, a kind of new liquid-crystal aberration correcting element is provided, proofread and correct aberration linearly, can improve the precision of recoding/reproduction thus because of the generations such as thickness deviation of CD in view of above-mentioned situation in the past.
In addition, the objective of the invention is to, a kind of new liquid-crystal aberration correcting element is provided, aberration correction linearly not only, and also its correcting value is big.
In order to solve above-mentioned problem, liquid-crystal aberration correcting element of the present invention is characterised in that, has following structure: possess liquid crystal and clip the opposed a plurality of electrodes of described liquid crystal phase, at least one of described electrode, form a plurality of non-electrode area that does not have electrode material; In the inboard of described non-electrode area, liquid crystal is orientated unevenly when applying voltage.
The invention effect
Liquid-crystal aberration correcting element of the present invention forms a plurality of non-electrode area on electrode, the uneven Electric Field Distribution orientation that liquid crystal molecule is formed on this non-electrode part bit position, thus produce lens effect.Thus, can proofread and correct the aberration that produces because of the thickness deviation of CD etc. linearly.Have again, control the state of orientation of liquid crystal, correcting value is at random changed by applying voltage.
According to the present invention, can proofread and correct the distortion of focal point, can improve the precision of recoding/reproduction.Therefore, be suitable as the correcting element of high density compact disc of future generation.
In addition, liquid-crystal aberration correcting element of the present invention is characterised in that, according to the position on the electrode size of a plurality of non-electrode area, configuration space is changed, and, along the configuration figure of this non-electrode area, many wire electrodes are provided with by predetermined interval.Thus, can obtain forcibly to improve by the phase differential of non-electrode area acquisition, the phase differential curve state that be enhanced, that correcting value is big that produces by non-electrode area as a whole at a plurality of positions that are provided with wire electrode.
Description of drawings
Fig. 1 is the vertical view of the liquid-crystal aberration correcting element of embodiment 1;
Fig. 2 is the enlarged drawing of the A part of Fig. 1;
Fig. 3 is the sectional view of the liquid-crystal aberration correcting element of embodiment 1;
Fig. 4 be explanation embodiment 1 liquid-crystal aberration correcting element apply voltage the time the figure of state;
Fig. 5 is the vertical view of the liquid-crystal aberration correcting element of embodiment 2;
Fig. 6 is the vertical view of the liquid-crystal aberration correcting element of embodiment 3;
Fig. 7 is the figure that schematically represents the phase changing capacity that obtained by the liquid-crystal aberration correcting element of embodiment 3;
Fig. 8 is the figure of manufacture process of the liquid-crystal aberration correcting element of explanation embodiment 3.
Symbol description: 1 liquid-crystal aberration correcting element
10 liquid crystal
20 electrodes
21 electrodes
201 non-electrode area
30 substrates
31 substrates
40a～40d wire electrode
400 electrodes
50 SiO
2Film
The E electric field
S1, S2 terminal
R1～R3 resistance
P, Q phase differential curve
Embodiment
The invention provides a kind of liquid-crystal aberration correcting element, have following structure: possess liquid crystal and clip the opposed a plurality of electrodes of described liquid crystal phase, at least one of described electrode, form a plurality of non-electrode area that does not have electrode material; Inboard in described non-electrode area, liquid crystal is orientated unevenly when applying voltage, described non-electrode area be shaped as circle, and the diameter of a plurality of non-electrode area and the configuration space radial direction when electrode is divided into concentric circles changes (first invention).
According to this structure, at the central part that forms a plurality of non-electrode area, comparative electrode forms weak electric field in vertical direction, end parts in non-electrode area, on the direction that tilts, form electric field, so, be orientated unevenly along this Electric Field Distribution liquid crystal molecule, thereby obtain the lens effect that changes continuously from center to the peripheral refractive index of non-electrode area.Therefore, make light beam pass through this lens component, predetermined phase differential and aberration correction is provided.In addition, the diameter of non-electrode area or configuration space are changed set the phase differential that obtains by each zone, carry out and corresponding best correction of aberration as element integral body.And, according to this structure, resulting phase differential concentric circles ground is changed, well correcting spherical aberration.
In addition, the invention provides a kind of liquid-crystal aberration correcting element, possess liquid crystal and clip the opposed a plurality of electrodes of described liquid crystal phase; On at least one of described electrode, do not exist a plurality of non-electrode area of electrode material to form the configuration figure that size or configuration space or the two change according to the position on the described electrode; In the inboard of described non-electrode area, liquid crystal is orientated unevenly when applying voltage; And, many wire electrodes that apply different mutually voltage are provided with (second invention) along described configuration figure with predetermined interval.
According to this structure, change by size or the configuration space that makes the non-electrode area of following lens effect as described above, obtain and the corresponding phase differential curve of aberration that produces, and, by many wire electrodes being set and applying voltage again at predetermined position, above-mentioned phase differential curve is emphasized, becomes best correcting value.
In addition, the present invention is in the liquid-crystal aberration correcting element of above-mentioned second invention, it is characterized in that, the size of a plurality of non-electrode area and the configuration space radial direction when electrode is divided into concentric circles changes, and the configuration figure that many wire electrodes change along described concentric circles ground is configured to ring-type (the 3rd invention).
According to this structure, by being set to the wire electrode of ring-type, be forced to draw on the ground along the phase differential at a plurality of positions of the radial direction of electrode, correcting spherical aberration well combines with the effect that is produced by above-mentioned non-electrode area.
In addition, the present invention is characterized in that in the liquid-crystal aberration correcting element of the above-mentioned first or the 3rd invention, in the configuration space of a plurality of non-electrode area each zone that is divided into concentric circles on electrode irregular (the 4th invention).
According to this structure, will form irregular (at random) with the interval of adjacent non-electrode area, prevent the corrugated disorder that produces by the light disturbing effect.
And the present invention is characterized in that in the liquid-crystal aberration correcting element of above-mentioned second～the 4th invention, non-electrode area be shaped as circle (the 5th invention).
According to this structure, for the aberration that produces, the shape of non-electrode area is optimized.
Below, explain the present invention.
At first, Fig. 1～Fig. 4 represents embodiments of the present invention 1.Fig. 1 is the vertical view of liquid-crystal aberration correcting element 1, and Fig. 2 is the enlarged drawing of the A part of Fig. 1, and Fig. 3 is the figure that has amplified the cross section of liquid-crystal aberration correcting element 1.As shown in Figure 3, liquid-crystal aberration correcting element 1 has liquid crystal 10, clips this liquid crystal 10 opposed two electrodes 20,21 and substrates 30,31, is formed with a plurality of non-electrode area 201 that does not have electrode material on electrode 20 poroidly.Have, in Fig. 3, the liquid crystal orientation film that is provided with between the antireflection film (AR film), electrode 20,21 and the liquid crystal 10 that are provided with on the substrate 30,31, transparent insulating layer etc. have omitted diagram usually again.In addition, on electrode 20 and electrode 21, be connected with and apply lead-in wire that voltage uses etc.
As shown in Figure 1, a plurality of non-electrode area 201 change size and configuration space according to the position on the electrode 20 continuously.Have, the number of non-electrode area 201 is described in Fig. 1 for the sake of simplicity and less again, in fact, as shown in Figure 2, is formed with a plurality of non-electrode area 201 imperceptibly.And, in this embodiment 1, along the radial direction R when being divided into concentric circles on the electrode 20, becoming minor diameter with the big or small d1 of non-electrode area 201 once from major diameter becomes large diameter mode again and is formed with continuous figure with configuration space d2 from the mode that wide interval becomes narrow interval once and become wide interval.
Apply under the voltage condition at 20,21 at electrode, the state of the electric field E the non-electrode area 201 near as shown in Figure 4.That is, in electrode 20 and electrode 21 opposed part a, form strong electric field on the direction vertical with electrode, the part b as the central part of non-electrode area 201 still forms weak electric field on the direction vertical with electrode.And, become the state that tilts towards electrode 20 electric fields at part c near the border of non-electrode area 201 and electrode 20.
So under the dielectric anisotropy of liquid crystal 10 was positive situation, liquid crystal molecule was orientated along electric field E, so at part a liquid crystal molecule with respect to the electrode homeotropic alignment,,, can be orientated obliquely owing to a little less than the electric field at part b at part c so remain the state parallel with electrode.That is, the inboard liquid crystal in non-electrode area 201 becomes uneven state of orientation.At this moment, the refractive index with respect to the light by element (unusual light) forms the distribution that the mind-set periphery reduces continuously from non-electrode area 201, so present the effect of convex lens in the part of non-electrode area 201.Thus, can give phase differential to the light that passes through.
Therefore, as shown in Figure 1, under size that makes non-electrode area 201 according to the position on the electrode and configuration space continually varying situation, because the phase differential difference that obtains in each position, suitably design the configuration figure of non-electrode area 201 according to the aberration that produces, thus can be as element overall linear ground aberration correction.
Have, under the situation that makes the change in voltage that applies, the state of orientation of liquid crystal molecule changes according to this voltage again.For example, increasing under the voltage condition, even at the center of non-electrode area 201, liquid crystal molecule also vertically is orientated, otherwise, from the extremely peripheral concavees lens effect that presents the refractive index increase in the center of non-electrode area 201.That is,, can make, so, can control voltage according to this result and proofread and correct the aberration that produces in real time for example according to reproducing (RF) waveform calculation correction amount by the whole phase differential curvilinear motion that obtains of element by the voltage that applies.
In addition, in the example of Fig. 1, the size of non-electrode area 201 and configuration space are changed along radial direction R.Like this, corresponding with the configuration figure of non-electrode area 201 and obtain the phase differential curve that concentric circles ground changes, so can proofread and correct the spherical aberration that the deviation because of disk thickness produces well.And, the size of non-electrode area 201 and configuration space are changed continuously, thus not as the aberration correcting element in the past of electrode is cut apart on concentric circles ground, to carry out stair-stepping discontinuous correction, but can carry out linear more correction.
And, in the configuration space of preferred non-electrode area 201 each zone that is divided into concentric circles (for example regional X, regional Y) on electrode 20 irregular (random arrangement).That is, as shown in Figure 2, make configuration space h1 and h2 slightly different.Like this, can prevent to interfere and the situation of corrugated disorder mutually by the light of adjacent non-electrode area respectively.
Have again, estimating almost not have under the situation of interference effect, also can make h1 and regularly configuration identical with h2 by the relation of light wavelength and configuration space.
As electrode 20,21, can use known in the past general electrode.Specifically, preferably adopt the ITO electrode that on transparent substrate 30,31, has formed indium-tin oxide film.About forming the electrode 20 of non-electrode area 201 sides, for example can constitute by metals such as AM aluminum metallization on substrate 30.
In addition,, at first, form after the electrode 20 on the most suitable employing whole on substrate 30, form the method for a plurality of non-electrode area 201 by optics processing by the configuration figure of expectation as the method that forms non-electrode area 201.Like this, can easily produce the fine configuration figure of continually varying.The method of carrying out across mask when perhaps, adopting on substrate 30 evaporation, electroplated electrode 20 etc.
Fig. 5 represents embodiment of the present invention 2.This liquid-crystal aberration correcting element 1 and above-mentioned embodiment 1 are same, are formed with a plurality of non-electrode area 201 on electrode 20, but are the size formation same diameter of non-electrode area 201.And, mind-set periphery from electrode 20, the configuration space that makes non-electrode area 201 from wide interval to narrow interval, again to the variation continuously of wide interval.Like this, have in the configuration that makes non-electrode area 201 under the situation of density, the lens effect of each non-electrode area when applying voltage, different in the zone that the density of non-electrode area 201 is close with the phase differential that rare zone obtains, can be used as the spherical aberration that the light beam that passes through element is proofreaied and correct on overall linear ground.
Below, according to Fig. 6～Fig. 8 relevant embodiments of the present invention 3 are described.Liquid-crystal aberration correcting element 1 and the above-mentioned embodiment 1 of Fig. 6 are same, form a plurality of non-electrode area 201 on the electrode 20 that clips liquid crystal, and the size of this non-electrode area 201 and configuration space are changed continuously to radial direction R.And, in this embodiment 3, it is characterized in that, the wire electrode 40a～40d of ring-type is set along the configuration figure (figure that changes circularly with one heart) of non-electrode area 201.
Fig. 7 schematically represents the phase differential curve by 1 acquisition of this liquid-crystal aberration correcting element.As shown in Figure 7, when the lens effect by non-electrode area 201 obtains phase differential curve P, liquid crystal further is orientated in being provided with position s, the t of wire electrode 40a～40d, u, v, thus, phase differential only improves scheduled volume, as a result of, become the state of the big phase differential curve Q of correcting value.Here, the magnitude of voltage that the position is set and is applied on each wire electrode of wire electrode 40a～40d can decide according to the phase differential curve P that is caused by non-electrode area 201.Promptly, preferably set the magnitude of voltage that is directly proportional with the phase changing capacity of phase differential curve P, for example applying between terminal S1, the S2 under the voltage condition of 1V, resistance R 1～R3 can be set at, on wire electrode 40a (s that is equivalent to Fig. 7), become applying voltage, becoming applying voltage, on wire electrode 40c (being equivalent to u), becoming applying voltage, (becoming the voltage that applies of 0.1V on being equivalent to v) of 1V of 0.6V on the wire electrode 40b (being equivalent to t) of 0V at wire electrode 40d.Have again, be not limited to the circuit structure of Fig. 6 for wire electrode 40a～40d certainly.
Fig. 8 represents the example of manufacture process of the liquid-crystal aberration correcting element 1 of embodiment 3.At first, shown in Fig. 8 (a), on glass substrate 30, form the electrode 400 (low resistance film, a few Ω～tens Ω) of ITO etc.Have again, in the present example, between substrate 30 and electrode 400, be formed with SiO
2Film 50.This film is the passivating film that prevents from the sodium composition stripping of substrate 30, can be provided with as required.
Then, shown in Fig. 8 (b), (c), the composition that carries out electrode 400 forms wire electrode 40a, forms the electrode 20 (high resistance membrane, tens Ω～hundreds of k Ω) of ITO etc. thereon.Then, shown in Fig. 8 (d), by forming a plurality of non-electrode area 201 at preposition, wire electrode 40a (40b～40d) and the target base plate of electrode 20 can have been obtained to form.Have, wire electrode 40a compares very thin (a few μ m～tens μ m degree) with the size of element again, so according to circumstances, also can be made of the opaque metal beyond the ITO.
The configuration figure of a plurality of non-electrode area 201 is not limited to above-mentioned embodiment 1～3.That is, according to the aberration that produces etc., can be according to the size of the non-electrode area 201 of the setting of the location-appropriate ground on the electrode 20 or configuration space or the two.Specifically, for example, can list following situation: opposite with Fig. 1, mind-set periphery from electrode 20, the size that makes non-electrode area from minor diameter to major diameter, situation about changing continuously to minor diameter again; Perhaps opposite with Fig. 5, mind-set periphery from electrode 20, the configuration space that makes non-electrode area from narrow interval to wide interval, change continuously to narrow interval again.In addition, as Fig. 1 and Fig. 5, the situation that is not limited to make size and configuration space concentric circles ground to change for example during the zone, also can form different configuration figures in zone separately about electrode 20 is divided into.In this case, can proofread and correct the intelligent image poor (coma) that the bending etc. because of dish produces effectively.
Have again, in the respective embodiments described above, only on electrode 20, be formed with non-electrode area 201, but also can form non-electrode area on both at electrode 20 and electrode 21.In this case, even near electrode 21, liquid crystal molecule also is orientated unevenly, so the lens effect that obtains is stronger, can increase correcting value.
In addition, constitute electrode 20, on each electrode, form a plurality of non-electrode area,, can be used as integral body and give more complicated phase differential curve by each electrode is applied different voltage by being divided into several electrodes.
In addition, opposed electrode is not above-mentionedly to be limited to a pair ofly like that, can be that a pair of above electrode clips liquid crystal and stacked yet.
In above-mentioned embodiment 1～3, the circular situation that is shaped as of a plurality of non-electrode area 201 has been described, but has been not limited thereto that for example the kind of the aberration of consideration generation, grinding direction etc. also can form other shapes.Specifically, can enumerate elliptical shape, semi-circular shape etc.
More than such liquid-crystal aberration correcting element 1, for example can constitute light picker, and be assembled in the optical disc apparatus and use with LASER Light Source, polaroid, 1/2 wave plate, quarter wave plate, object lens, photo detector etc.
Owing to can proofread and correct the aberration of generation linearly, so can be suitable for high density compact discs such as BD of future generation, multilayer disc.
Utilizability on the industry
Liquid-crystal aberration correcting element of the present invention be used for to be proofreaied and correct by light picker in optical disc apparatus The aberration that produces during recoding/reproduction.
Claims (6)
1. liquid-crystal aberration correcting element, this liquid-crystal aberration correcting element constitutes, possess liquid crystal and clip the opposed a plurality of electrodes of described liquid crystal phase, on at least one of described electrode, form a plurality of non-electrode area that does not have electrode material, inboard in described non-electrode area, liquid crystal is orientated unevenly when applying voltage, described non-electrode area be shaped as circle, and the diameter of a plurality of non-electrode area and the configuration space radial direction when electrode is divided into concentric circles changes.
2. liquid-crystal aberration correcting element as claimed in claim 1 is characterized in that, and is irregular in the configuration space of a plurality of non-electrode area each zone that is divided into concentric circles on electrode.
3. liquid-crystal aberration correcting element, this liquid-crystal aberration correcting element constitutes, possess liquid crystal and clip the opposed a plurality of electrodes of described liquid crystal phase, on at least one of described a plurality of electrodes, do not exist a plurality of non-electrode area of electrode material to form the configuration figure that size or configuration space or the two change according to the position on this electrode, in the inboard of described non-electrode area, liquid crystal is orientated unevenly when applying voltage; And, many wire electrodes that apply different voltages are set with predetermined interval along described configuration figure.
4. liquid-crystal aberration correcting element as claimed in claim 3, it is characterized in that, above-mentioned configuration figure is, the size of a plurality of non-electrode area and the configuration space radial direction when above-mentioned at least one electrode is divided into concentric circles changes, and many wire electrodes are configured to ring-type along this configuration figure.
5. liquid-crystal aberration correcting element as claimed in claim 4 is characterized in that, and is irregular in the configuration space of a plurality of non-electrode area each zone that is divided into concentric circles on electrode.
6. as each the described liquid-crystal aberration correcting element in the claim 3～5, it is characterized in that, non-electrode area be shaped as circle.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2003353770 | 2003-10-14 | ||
| JP353770/2003 | 2003-10-14 |
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| CN1867859A CN1867859A (en) | 2006-11-22 |
| CN100394257C true CN100394257C (en) | 2008-06-11 |
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| CNB2004800300481A Expired - Fee Related CN100394257C (en) | 2003-10-14 | 2004-09-24 | Liquid crystal aberration correcting element |
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| JP (1) | JP4008944B2 (en) |
| KR (1) | KR100761950B1 (en) |
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| JP2006003739A (en) * | 2004-06-18 | 2006-01-05 | Sony Corp | Phase correction optical element, optical pickup apparatus and phase correction method |
| JP4581969B2 (en) * | 2005-11-14 | 2010-11-17 | コニカミノルタホールディングス株式会社 | Liquid crystal device and optical pickup |
| JP2008203574A (en) * | 2007-02-20 | 2008-09-04 | Binit:Kk | Liquid crystal optical element and method for manufacturing the same |
| CN110058464B (en) * | 2019-05-29 | 2022-01-07 | 京东方科技集团股份有限公司 | Liquid crystal photon sieve structure and near-to-eye display device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06301036A (en) * | 1993-04-12 | 1994-10-28 | Sanyo Electric Co Ltd | Liquid crystal display device |
| JP2001100174A (en) * | 1999-07-07 | 2001-04-13 | Matsushita Electric Ind Co Ltd | Optical device, optical head and optical recording reproducing device |
| JP2001143303A (en) * | 1999-09-02 | 2001-05-25 | Asahi Glass Co Ltd | Optical head device |
| US20010033541A1 (en) * | 2000-03-28 | 2001-10-25 | Masayuki Iwasaki | Aberration compensating apparatus and method |
| US6480454B1 (en) * | 1998-12-15 | 2002-11-12 | Matsushita Electric Industrial Co., Ltd. | Optical element, optical head using the optical element, and optical recording and reproducing apparatus using the optical element |
| JP2003036555A (en) * | 2001-07-26 | 2003-02-07 | Asahi Glass Co Ltd | Optical head device |
| JP2003043525A (en) * | 2000-08-11 | 2003-02-13 | Sharp Corp | Liquid crystal display device |
| US6532202B1 (en) * | 1999-07-07 | 2003-03-11 | Matsushita Electric Industrial Co., Ltd. | Optical element, optical head and optical recording reproducing apparatus |
| JP2003228871A (en) * | 2002-01-31 | 2003-08-15 | Asahi Glass Co Ltd | Optical head device |
-
2004
- 2004-09-24 CN CNB2004800300481A patent/CN100394257C/en not_active Expired - Fee Related
- 2004-09-24 KR KR1020067006127A patent/KR100761950B1/en not_active IP Right Cessation
- 2004-09-24 JP JP2005514549A patent/JP4008944B2/en not_active Expired - Fee Related
- 2004-09-24 WO PCT/JP2004/013940 patent/WO2005036242A1/en active Application Filing
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06301036A (en) * | 1993-04-12 | 1994-10-28 | Sanyo Electric Co Ltd | Liquid crystal display device |
| US6480454B1 (en) * | 1998-12-15 | 2002-11-12 | Matsushita Electric Industrial Co., Ltd. | Optical element, optical head using the optical element, and optical recording and reproducing apparatus using the optical element |
| JP2001100174A (en) * | 1999-07-07 | 2001-04-13 | Matsushita Electric Ind Co Ltd | Optical device, optical head and optical recording reproducing device |
| US6532202B1 (en) * | 1999-07-07 | 2003-03-11 | Matsushita Electric Industrial Co., Ltd. | Optical element, optical head and optical recording reproducing apparatus |
| JP2001143303A (en) * | 1999-09-02 | 2001-05-25 | Asahi Glass Co Ltd | Optical head device |
| US20010033541A1 (en) * | 2000-03-28 | 2001-10-25 | Masayuki Iwasaki | Aberration compensating apparatus and method |
| JP2003043525A (en) * | 2000-08-11 | 2003-02-13 | Sharp Corp | Liquid crystal display device |
| JP2003036555A (en) * | 2001-07-26 | 2003-02-07 | Asahi Glass Co Ltd | Optical head device |
| JP2003228871A (en) * | 2002-01-31 | 2003-08-15 | Asahi Glass Co Ltd | Optical head device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1867859A (en) | 2006-11-22 |
| JPWO2005036242A1 (en) | 2006-12-21 |
| WO2005036242A1 (en) | 2005-04-21 |
| KR20060054476A (en) | 2006-05-22 |
| JP4008944B2 (en) | 2007-11-14 |
| KR100761950B1 (en) | 2007-10-02 |
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