WO2006043516A1 - 液晶回折レンズ素子および光ヘッド装置 - Google Patents
液晶回折レンズ素子および光ヘッド装置 Download PDFInfo
- Publication number
- WO2006043516A1 WO2006043516A1 PCT/JP2005/019062 JP2005019062W WO2006043516A1 WO 2006043516 A1 WO2006043516 A1 WO 2006043516A1 JP 2005019062 W JP2005019062 W JP 2005019062W WO 2006043516 A1 WO2006043516 A1 WO 2006043516A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- liquid crystal
- fresnel lens
- birefringent
- light
- lens member
- Prior art date
Links
Classifications
-
- 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
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/133526—Lenses, e.g. microlenses or Fresnel lenses
-
- 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
- G11B7/1365—Separate or integrated refractive elements, e.g. wave plates
- G11B7/1369—Active plates, e.g. liquid crystal panels or electrostrictive elements
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B3/00—Simple or compound lenses
- G02B3/02—Simple or compound lenses with non-spherical faces
- G02B3/08—Simple or compound lenses with non-spherical faces with discontinuous faces, e.g. Fresnel lens
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B3/00—Simple or compound lenses
- G02B3/12—Fluid-filled or evacuated lenses
- G02B3/14—Fluid-filled or evacuated lenses of variable focal length
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/18—Diffraction gratings
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/18—Diffraction gratings
- G02B5/1866—Transmission gratings characterised by their structure, e.g. step profile, contours of substrate or grooves, pitch variations, materials
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/18—Diffraction gratings
- G02B5/1876—Diffractive Fresnel lenses; Zone plates; Kinoforms
-
- 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
-
- 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
- G02F1/29—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 position or the direction of light beams, i.e. deflection
-
- 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
- G11B7/1353—Diffractive elements, e.g. holograms or gratings
-
- 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
- G11B7/1372—Lenses
- G11B7/1378—Separate aberration correction lenses; Cylindrical lenses to generate astigmatism; Beam expanders
-
- 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
-
- 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
- G02F1/29—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 position or the direction of light beams, i.e. deflection
- G02F1/294—Variable focal length devices
-
- 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
- G11B2007/0003—Recording, reproducing or erasing systems characterised by the structure or type of the carrier
- G11B2007/0006—Recording, reproducing or erasing systems characterised by the structure or type of the carrier adapted for scanning different types of carrier, e.g. CD & DVD
Definitions
- Liquid crystal diffractive lens element and optical head device Liquid crystal diffractive lens element and optical head device
- the present invention relates to a liquid crystal diffractive lens element capable of switching a focal position, and recording of information on an optical recording medium such as an optical disk and / or reproducing of information from the optical recording medium force (hereinafter, referred to as "optical recording medium").
- optical recording medium an optical recording medium that uses this liquid crystal diffractive lens element for recording and reproduction.
- an optical head device that records and reproduces an optical recording medium such as an optical disc
- information is recorded and reproduced on an optical disc having a different cover layer thickness such as a CD and a DVD.
- the depth of the information recording surface for recording information from the optical disc surface (hereinafter simply referred to as the depth of the information recording surface) is different.
- a light modulation element for switching the focal length is used (for example, Japanese Patent Laid-Open No. Hei 9 (1994)). — See No. 230300, hereinafter referred to as Patent Document 1).
- the light modulation element disclosed in Patent Document 1 is provided at a boundary between a pair of transparent substrates, a liquid crystal sandwiched between these transparent substrates, and the liquid crystal and one transparent substrate.
- An optical member having the shape of a Fresnel lens and a transparent electrode for applying a voltage to the liquid crystal By switching the voltage applied to the liquid crystal, the orientation direction of the liquid crystal is switched, and the refractive index of the liquid crystal with respect to incident light is changed. Switching is performed to switch whether or not the optical member functions as a Fresnel lens.
- an optical head device In an optical head device, light that is polarized in a specific direction is usually used as incident light, and the refractive index is switched by matching the alignment direction of the liquid crystal with the polarization direction of the incident light. Is called.
- the refractive index of the liquid crystal is switched so as to be the same as or different from the refractive index of the optical member having the Fresnel lens shape before and after switching of the voltage applied to the liquid crystal.
- one optical modulation element is provided for each of the forward path and the backward path so that the focal lengths of both the forward path light and the backward path light can be switched, thereby increasing the size of the optical head device and the complexity of driving.
- the present invention has been made to solve such a problem, and a liquid crystal diffractive lens element capable of switching the focal lengths of both forward light and backward light with one element, and an optical head using the same A device is provided.
- the present invention provides the following contents.
- a second birefringent Fresnel formed between the lens member, the second transparent substrate facing the first transparent substrate, and the liquid crystal, and having a Fresnel lens shape and made of a birefringent material.
- a liquid crystal diffractive lens element comprising a lens member
- the extraordinary refractive index direction of the first birefringent Fresnel lens member and the extraordinary refractive index direction of the second birefringent Fresnel lens member are orthogonal to each other
- the alignment direction of the liquid crystal at the interface between the liquid crystal and the first birefringent Fresnel lens member or the transparent electrode, and the alignment direction of the liquid crystal at the interface between the liquid crystal and the second birefringent Fresnel lens member or the transparent electrode Liquid crystal diffraction lens element characterized by being summer as orthogonal.
- the first birefringent Fresnel lens member, the second birefringent Fresnel lens member, and the power S are switched by applying an electric field to the liquid crystal and switching the alignment direction of the liquid crystal. Since it functions as a Fresnel lens for the light it contains, it is possible to realize a liquid crystal diffractive lens element that can switch the focal length of both forward and backward light with a single element.
- each birefringent Fresnel lens member functions as a Fresnel lens
- a simple liquid crystal diffractive lens element can be realized.
- the same means ⁇ 5 of each refractive index. /.
- the value is within.
- 4. The liquid crystal diffractive lens according to any one of 1 to 3, wherein the shape of the first birefringent Fresnel lens member and the shape of the second birefringent Fresnel lens member are the same. Element.
- the shape of the first birefringent Fresnel lens member is the same as the shape of the second birefringent Fresnel lens member. Therefore, a liquid crystal diffractive lens element capable of converting the focal length at the same magnification can be realized.
- the extraordinary refractive index direction of the first birefringent Fresnel lens member and the second birefringent Fresnel lens member is parallel to the transparent substrate surface and perpendicular to the transparent substrate surface.
- the liquid crystal diffractive lens element according to any one of 1 to 4, wherein the liquid crystal diffractive lens element is twisted with respect to.
- the extraordinary refractive index direction of the birefringent Fresnel lens member is twisted in the direction perpendicular to the transparent substrate surface.
- a liquid crystal diffractive lens element that can align the alignment direction of the liquid crystal with the extraordinary optical refractive index direction at the concave and convex portions of the birefringent Fresnel lens member, and that can more effectively function as a Fresnel lens. it can.
- liquid crystal diffractive lens element according to any one of 1 to 5, wherein the liquid crystal diffractive lens element is integrated with a phase plate whose phase difference with respect to the wavelength of transmitted light is an odd multiple of ⁇ / 2.
- the liquid crystal diffractive lens element that can be easily adjusted and saves space can be realized because it is integrated with the phase plate. It can appear.
- the alignment direction of the liquid crystal is in the vicinity of the interface with each birefringent Fresnel lens member. Since it coincides with the rate direction, it is possible to realize a liquid crystal diffractive lens element that can more suitably exhibit the function as a Fresnel lens. Where matches It may be in a state of being deviated to the extent that the effects of the invention are not impaired. Specifically, there may be a deviation within about 10 degrees.
- the birefringence index of the entire Fresnel lens member consisting of an isotropic material and a birefringent material force can be adjusted.
- a liquid crystal diffractive lens element with a high degree of design freedom due to a large amount of liquid crystal noisy can be realized.
- liquid crystal diffractive lens element according to any one of 4 to 8, wherein a phase adjustment surface having a concavo-convex shape is integrated with at least one of the transparent substrates.
- a transmitted wavefront change by the phase adjustment surface can be added independently of the transmitted wavefront change generated by the Fresnel lens member and the liquid crystal.
- a liquid crystal diffractive lens element having a high degree of design freedom can be realized due to many variations of transmitted wavefront changes.
- phase adjusting surface is formed of a plurality of materials having different refractive index temperature coefficients.
- An optical head device comprising: a liquid crystal diffractive lens element according to claim 1; and an optical detector that reads information on the optical recording medium force.
- the polarization direction of the forward light is made to coincide with or orthogonal to the extraordinary refractive index direction of the first birefringent Fresnel lens member. It is possible to realize an optical head device in which the refractive Fresnel lens member can more suitably exhibit the function as a Fresnel lens.
- the first birefringent Fresnel lens member and the second birefringent Fresnel lens member have polarization directions orthogonal to each other by switching the alignment direction of the liquid crystal by applying an electric field to the liquid crystal. Since it functions as a Fresnel lens for light, it is possible to realize a liquid crystal diffractive lens element and an optical head device that can switch the focal lengths of both forward and backward light with a single element.
- FIG. 1 is a cross-sectional view showing a conceptual configuration of a liquid crystal diffractive lens element according to first and second embodiments of the present invention.
- FIG. 2 is a plan view showing a conceptual configuration of a liquid crystal diffractive lens element according to an embodiment of the present invention.
- FIG. 3 is an explanatory diagram for explaining the shape of a birefringent Fresnel lens member constituting the liquid crystal diffractive lens element according to the first embodiment of the present invention.
- FIG. 4 is an enlarged cross-sectional view showing a conceptual configuration of a liquid crystal diffractive lens element according to a second embodiment of the present invention.
- FIG. 5 is a cross-sectional view showing another conceptual configuration of the liquid crystal diffractive lens element according to the second embodiment of the present invention.
- FIG. 6 is a cross-sectional view showing another conceptual configuration of the liquid crystal diffractive lens element according to the second embodiment of the present invention.
- FIG. 7 is a diagram showing a conceptual configuration of an optical head device according to an embodiment of the present invention.
- FIG. 1 and FIG. 2 are a sectional view and a plan view, respectively, showing a conceptual configuration of the liquid crystal diffractive lens element according to the first embodiment of the present invention.
- the cross-sectional view shown in FIG. 1 is a view showing a DD ′ cross section of the liquid crystal diffractive lens element 10 shown in FIG. 1 and 2, the liquid crystal diffractive lens element 10 includes a pair of transparent substrates la and lb arranged in parallel, a liquid crystal 4 sandwiched between the pair of transparent substrates la and lb, and an electric field applied to the liquid crystal.
- Transparent electrode 2a for applying 2b, a first birefringent Fresnel lens member 3a formed between the first transparent substrate la and the liquid crystal 4 and having the shape of a Fresnel lens and having a birefringent material force, and a first transparent substrate la
- a second birefringent Fresnel lens member 3b formed between the second transparent substrate lb and the liquid crystal 4 facing each other, having the shape of a Fresnel lens and made of a birefringent material, and a seal 5 are provided.
- the transparent substrates la and lb for example, an acrylic resin, an epoxy resin, a salt vinyl resin, a polycarbonate, or the like may be used, but a glass substrate is used from the viewpoint of durability and the like. Is preferred.
- the transparent electrodes 2a and 2b a force capable of using a metal film made of Au, A1 or the like.
- a mechanical film made of ITO or SnO or the like is more mechanically light transmissive than a metal film. durability
- An external voltage signal source 20 is connected to the transparent electrodes 2a and 2b, and a predetermined voltage signal output from the external voltage signal source 20 is applied to the liquid crystal 4.
- the frequency of the rectangular AC voltage signal which is preferably a rectangular AC voltage signal, is preferably 10 Hz to 10 kHz.
- the DC component in the rectangular AC voltage signal is sufficiently small.
- the birefringent Fresnel lens members 3a and 3b are made of a birefringent material, and a plurality of rings are formed concentrically around the optical axis 0 so as to function as a Fresnel lens near the wavelength of incident light.
- a birefringent material inorganic materials such as lithium niobate and quartz, polymer liquid crystal, and the like can be used.
- polymer liquid crystal facilitates the formation of the birefringent Fresnel lens members 3a and 3b, allows adjustment of the refractive index, and reduces the degree of design freedom due to many variations in polymer liquid crystal. From the viewpoint of height, it is preferable.
- Each of the above-mentioned rings constituting the birefringent Fresnel lens members 3a and 3b is blazed in order to increase the diffraction efficiency.
- an approximation of a cross-sectional shape with a cross-section (for example, the D_D ′ cross-section shown in FIG. 2) including the central axis of the above-mentioned blaze ring in a step-like shape (hereinafter referred to as a pseudo-blade ring) It may be used instead of the above blaze ring.
- the term “blazed wheel” includes a pseudo-blazed wheel.
- the blaze ring is a convex blaze ring protruding from the substrate surface, or a concave shape recessed from the substrate surface.
- the blaze wheel of hereinafter, the shapes of the birefringent Fresnel lens members 3a and 3b will be described with reference to FIG.
- the curves indicated by the symbols Pl and P2 in FIG. 3 indicate the optical axis of the difference distribution (hereinafter referred to as phase shift distribution) of the phase change amount received by the incident light after passing through a predetermined lens. In-plane.
- the curves indicated by the reference signs Pl and P2 are referred to as optical axis phase shift curves.
- the difference distribution (phase shift distribution) of the phase change amount is obtained by subtracting the phase change amount on the optical axis from the distribution of the phase change amount after passing through the lens.
- the phase shift distribution is almost rotationally symmetric with respect to the optical axis, and the distribution is such that the focus of the incident light is switched.
- the optical axis phase shift curves indicated by reference numerals Pl and P2 correspond to the optical axis phase shift curves of the convex lens and the concave lens, respectively.
- phase shift distribution is represented by the following power series.
- ⁇ (r) is the phase shift distribution at distance r.
- phase shift distribution in the plane including the optical axis of the light after passing through the birefringent Fresnel lens members 3a and 3b is indicated by reference numerals F1 (corresponding to P1) and F2 (corresponding to P2). It becomes a phase shift curve. Since the light does not substantially change due to the phase difference of an integral multiple of the wavelength, each birefringent Fresnel lens member 3a, 3b equivalently has one of the optical axis phase shift curves indicated by reference signs Pl and P2. The phase of the incident light is changed by the amount of the phase shift distribution.
- phase shift distribution having the optical axis phase shift curve indicated by the symbols Fl and F2 is simply referred to as “phase shift distribution indicated by the symbols F1 and F2.” Since the Fresnel lens is well known, further specific explanation is omitted.
- Each blaze wheel constituting the birefringent Fresnel lens members 3a and 3b has a radial width and a thickness in the optical axis direction in which a phase shift distribution indicated by reference numerals Fl and F2 is obtained.
- the thickness of each blaze wheel in the optical axis direction is determined according to the birefringent material used. In the example shown in Fig. 3, the maximum thickness of each blaze wheel in the optical axis direction is set so that the optical path difference is a maximum of one wavelength. Note that matching the shape of the first birefringent Fresnel lens member 3a with the shape of the second birefringent Fresnel lens member 3b switches the focal length at the same magnification. Therefore, it is preferable.
- each blaze ring may be performed using a photolithography technique and an etching technique, a mold, or another method.
- the thickness of the birefringent material that may be twisted in the thickness direction is d, and the maximum thickness of the liquid crystal 4 is d.
- a structure twisted by F Zd is preferable.
- the birefringent Fresnel lens members 3a and 3b having a blaze ring convex and the direction in which the incident light senses the extraordinary refractive index (hereinafter referred to as the extraordinary refractive index direction) are denoted by reference symbol A. , B are shown. That is, in the configuration shown in FIG. 1, the extraordinary refractive index direction A of the birefringent Fresnel lens member 3a is a direction parallel to the substrate and the paper (X-axis direction), and the extraordinary light refraction of the birefringent Fresnel lens member 3b.
- the rate direction B is parallel to the substrate and perpendicular to the page (Y-axis direction).
- the liquid crystal 4 is twist-aligned between the two transparent substrates la and lb so that the alignment direction (major axis direction of the liquid crystal molecules) twists 90 degrees.
- the liquid crystal 4 a twisted nematic liquid crystal is suitable.
- the orientation of the liquid crystal 4 is a surface obtained by rubbing an alignment film such as polyimide or polyvinyl alcohol (PVA), a surface obtained by photo-alignment by irradiating a chemical substance having a photoreactive functional group with UV light polarized in a specific direction, It can be set by bringing liquid crystal 4 into contact with a surface obtained by obliquely depositing SiO or the like, or a surface obtained by irradiating diamond-like carbon or the like with an ion beam.
- PVA polyimide or polyvinyl alcohol
- the alignment film or the like is used to form the birefringent Fresnel lens members 3a and 3b using a polymer liquid crystal and to align the liquid crystal 4 using the arrangement of surface molecules of the polymer liquid crystal. This is suitable because the orientation processing required is unnecessary.
- the alignment direction of the liquid crystal 4 is matched with the extraordinary refractive index direction of the birefringent Fresnel lens members 3a and 3b in contact with the liquid crystal 4.
- the thickness of the liquid crystal 4 is preferably thicker when emphasizing obtaining desired optical characteristics. The thinner one is preferred when emphasizing obtaining desired response speed.
- a positive one with a dielectric anisotropy ( ⁇ ⁇ ) or a negative one may be used as the liquid crystal 4.
- the difference in the dielectric anisotropy ( ⁇ ⁇ ) is that when the electric field is applied, the major axis direction of the liquid crystal molecules moves in the direction of the electric field or in the direction perpendicular to the electric field direction.
- the difference is that the anisotropy ( ⁇ ⁇ ) may be either positive or negative.
- the orientation of the liquid crystal 4 is substantially perpendicular to the substrate surface when no voltage is applied.
- the transparent substrates la and lb, the transparent electrodes 2a and 2b, the birefringent Fresnel lens members 3a and 3b, and the liquid crystal 4 may be stacked in this order.
- the birefringence Fresnel lens members 3a and 3b, the transparent electrodes 2a and 2b, and the liquid crystal 4 are preferably laminated in this order because an electric field can be uniformly applied to the liquid crystal 4.
- polymer liquid crystal is used as the birefringent material for the birefringent Fresnel lens members 3a and 3b, and the liquid crystal 4 is aligned by utilizing the alignment direction of the polymer liquid crystal molecules on the surface of the blaze ring. And the twist in the thickness direction including the four parts of the liquid crystal becomes uniform, which is very preferable.
- an insulating film between the opposing transparent electrodes 2a and 2b it is preferable to provide an insulating film between the opposing transparent electrodes 2a and 2b to prevent a short circuit.
- an inorganic material such as SiO, ZrO, TiO, etc. is used.
- a vacuum film formation method using a method, a chemical film formation method using a sol-gel method, and the like.
- a flexible circuit board may be used as the wiring for connecting the transparent electrodes 2a, 2b and the external voltage signal source 20. In this case, on the liquid crystal diffractive lens element 10 side, the flexible circuit board is connected to the terminal extraction portions 22a and 22b of the transparent electrodes 2a and 2b.
- the sheath 5 is for preventing the liquid crystal 4 from leaking between the transparent substrates la and lb, and is provided on the outer periphery of the optically effective area to be secured.
- a resin adhesive such as epoxy and acrylic is preferable for handling, but it may be cured by heating or irradiation with UV light.
- spacers such as glass fibers may be mixed.
- an antireflection film is preferable because it improves light utilization efficiency.
- a dielectric multilayer film, a wavelength order thin film, or the like can be used. These films may be formed by using a vapor deposition method, a sputtering method, or the like.
- the liquid crystal 4 is oriented in the extraordinary refractive index directions A and B in the vicinity of the birefringent Fresnel lens members 3a and 3b.
- the alignment of the liquid crystal means that the liquid crystal molecules are aligned. The same shall apply hereinafter.
- N n
- the birefringent Fresnel lens member 3a does not function as a Fresnel lens due to the same extraordinary refractive index, and incident light passes through the birefringent Fresnel lens member 3a as it is.
- passing through as it is is referred to as “through”.
- the light that has passed through the birefringent Fresnel lens member 3a enters the liquid crystal 4 by being twisted 90 degrees continuously to the birefringent Fresnel lens member 3b side, so that the polarization direction is rotated by 90 degrees.
- the liquid crystal 4 is aligned in the extraordinary refractive index direction B (Y-axis direction) at the interface with the birefringent Fresnel lens member 3b, and n
- the light polarized in the Y-axis direction and traveling in the Z-axis direction operates as follows.
- the lens member 3a does not function as a Fresnel lens, and incident light passes through the birefringent Fresnel lens member 3a as it is.
- the light that has passed through the birefringent Fresnel lens member 3a is twisted by 90 degrees and twisted by the liquid crystal 4 continuously to the birefringent Fresnel lens member 3b side, so that the polarization direction is rotated 90 degrees and incident.
- the birefringent Fresnel lens member 3b does not function as a Fresnel lens, and passes through the birefringent Fresnel lens member 3b as it is.
- the light polarized in the Y-axis direction and traveling in the Z-axis direction passes through the liquid crystal diffractive lens element without receiving the lens effect, although the polarization direction changes in the X-axis direction. Therefore, when no voltage is applied, the incident light passes through the liquid crystal diffractive lens element 10 as it is regardless of whether the polarization direction is the X-axis direction force or the Y-axis direction.
- the birefringent Fresnel lens member receives the action of the birefringent Fresnel lens member 3a and becomes divergent light or convergent light. Exit 3a.
- the light emitted from the birefringent Fresnel lens member 3a has an ordinary refractive index at the interface between the liquid crystal 4 and the birefringent Fresnel lens member 3b, and on the liquid crystal 4 side and the birefringent Fresnel lens member 3b side. n, so the same
- the light polarized in the Y-axis direction and traveling in the Z-axis direction acts as follows. That is, when light polarized in the Y-axis direction and traveling in the Z-axis direction is incident on the liquid crystal diffractive lens element 10, the liquid crystal 4 side and the birefringent Fresnel lens are formed at the interface between the liquid crystal 4 and the birefringent Fresnel lens member 3a.
- the birefringent Fresnel lens member 3b receives the action of the birefringent Fresnel lens member 3b, and becomes divergent light or convergent light, and exits the birefringent Fresnel lens member 3b.
- the light polarized in the Y-axis direction and traveling in the Z-axis direction is affected by the birefringent Fresnel lens member 3b.
- the light passes through the liquid crystal diffractive lens element 10 as divergent light or convergent light.
- birefringent Fresnel lens members 3a and 3b made of a birefringent material and the liquid crystal 4 are used, and the refractive index (n, n) of the birefringent material and the liquid crystal 4
- the refractive index (n, n) of the birefringent material and the refractive index (n, n) of the liquid crystal 4 are perfectly matched ⁇ e lo le
- birefringent materials and liquid crystal materials that can be used are limited.
- the ordinary light refractive index n is larger than the ordinary light refractive index n of the liquid crystal 4.
- FIG. 4 is an enlarged cross-sectional view showing a conceptual configuration of an example of the liquid crystal diffractive lens element 30 according to the second embodiment of the present invention.
- the Fresnel lens shape of the refractive index adjusting portions 3a2 and 3b2 of the isotropic material is produced. An example is shown.
- the first birefringent Fresnel lens member 3a and the second birefringent Fresnel lens member 3b are isotropic with the birefringent materials 3al and 3bl.
- the other differences are the same as those of the liquid crystal diffractive lens element 10 according to the first exemplary embodiment except that the refractive index adjusting units 3a2 and 3b2 of the material are used.
- birefringence is the refractive index (n, n) of the birefringent material for light traveling in the Z-axis direction.
- the ratio of optical path lengths to 2 and 3b2: 1—H (0, H 1) is constant at each position in the XY plane
- the birefringent Fresnel lens members 3al, 3bl and the refractive index adjusting parts 3a2, 3b2 are integrated into
- the extraordinary refractive index is ⁇ X n + (1 ⁇ ⁇ ) X n
- the ordinary refractive index is ⁇ es
- the birefringent Fresnel lens member By configuring the birefringent Fresnel lens member with a birefringent material and an isotropic material force, the ordinary refractive index and extraordinary refractive index with respect to the incident light can be adjusted. This makes it possible to realize a liquid crystal diffractive lens element having a high degree of design freedom.
- n a X n + (1 _ H) X n.
- N is one of the refractive indices of the liquid crystal 4.
- the refractive index adjusting portions 3a2 and 3b2 may be made of isotropic materials such as glass and resin, or birefringent materials such as polymer liquid crystals, but are preferably transparent.
- the refractive index adjusting sections 3a2 and 3b2 can be shaped by processing the material layer formed on the transparent substrate la and lb using an etching technique, or by using a press or a mold.
- the transparent substrates la and lb may be directly caulked to produce irregularities.
- FIG. 5 is a cross-sectional view showing a conceptual configuration of an example of the liquid crystal diffractive lens element 40 according to the second embodiment of the present invention, in place of the refractive index adjusting units 3a2 and 3b2 in FIG.
- the phase adjustment unit 7 is added to one side of the transparent substrate lb of the liquid crystal diffractive lens element 10 according to the first embodiment.
- the phase adjuster 7 adjusts the phase of the Fresnel lens shape formed of the same annular zone as the Fresnel shaped annular zones of the first and second birefringent Fresnel lens members 3a and 3b on one surface of the transparent substrate la or lb. It consists of face 6.
- the phase adjustment surface 6 can be directly processed by press molding or the like on the surface of the transparent substrate lb, or it can be produced separately and bonded to the transparent substrate 1b.
- the material of the phase adjustment surface 6 may be any material such as glass, ceramics, or resin, but is preferably transparent from the viewpoint of light utilization efficiency.
- phase adjustment surface 6 when a birefringent material is used as the phase adjustment surface 6, it becomes possible to carry out separate phase adjustments for ordinary light polarization and extraordinary light polarization, and the degree of freedom in design is improved. Occurring when such a phase adjusting portion 7 is formed, the refractive index (n, n) of the birefringent material of the birefringent Fresnel lens members 3a, 3b and the refractive index (n, n) of the liquid crystal 4 are different.
- the birefringent Fresnel lens member 3a is not applied with a voltage applied.
- the phase adjustment surface 6 made of an isotropic material having a refractive index n is formed to pass through the transmission surface.
- the decrease in excess rate can be resolved.
- the liquid crystal 4 satisfies the maximum diffraction condition including the birefringent Fresnel lens components 3a and 3b and the liquid crystal 4 and further the phase adjustment surface 6 in a voltage application state where the refractive index of the liquid crystal 4 is equivalent to n.
- it is approximately equal to the wavelength ⁇ .
- FIG. 5 shows an example in which the phase adjusting surface 6 is formed on the transparent substrate 1b on the light exit side, it may be formed on the transparent substrate la on the light incident side or on both surfaces on the light incident / exit side. .
- the distance between the phase adjusting surface 6 and the birefringent Fresnel lens members 3a and 3b is preferably as short as possible. Therefore, it is preferable that the transparent substrate lb is thin.
- the phase adjustment surface 6 may have a Fresnel lens shape whose cross section approximates a stepped shape.
- the transparent substrates la and lb are joined by the seal 5.
- phase adjustment surface 8a made of an isotropic material having a refractive index n processed into a Fresnel lens shape is formed on one surface of the transparent substrate lb. That concave At least the concave portion of the convex portion is filled with a filler 8b made of an isotropic material having a refractive index n (n ⁇ n).
- FIG. 6 is a cross-sectional view showing a conceptual configuration of an example of a liquid crystal diffractive lens element 50 that is a phase adjustment unit 9 that is filled and held between transparent substrates lb and lc.
- the liquid crystal diffractive lens element 50 is preferable because the degree of freedom in designing and manufacturing the phase adjustment surface is increased by adjusting the refractive indexes of the phase adjustment surface 8a and the filler 8b.
- the filler 8b fills the uneven portion of the phase adjustment surface 8a, and bonds and fixes the transparent substrates lb and lc, so that a thermosetting epoxy-based or photo-curable acrylic adhesive can be used. Also, when the temperature dependence of the refractive index of the birefringent Fresnel lens members 3a, 3b and the liquid crystal 4 is different, there arises a problem that the efficiency of the transmitted wavefront changes from a desired value according to the temperature change of the liquid crystal diffractive lens element. .
- the temperature dependence of the birefringent Fresnel lens members 3a, 3b and the liquid crystal 4 is compensated, and the liquid crystal diffractive lens element
- the case where the birefringent Fresnel lens members 3a and 3b have a concentric Fresnel zone shape has been described, but other cross-sectional shapes can be improved.
- the cross-section is a parabolic surface, so that the transmitted wavefront changes to a divergent light or a convergent light according to the applied voltage.
- an aberration component can be added to the transmitted wavefront according to the applied voltage.
- a transmitted wavefront change independent of the polarization direction of incident light can be obtained.
- the transparent substrates la and lb are joined by the seal 5.
- the liquid crystal diffractive lens element of the present invention that generates a transmitted wavefront change that does not depend on the polarization direction of incident light is the polarization state of incident light. It is possible to obtain a transmitted wavefront change without depending on.
- FIG. 7 is a diagram showing a conceptual configuration of the optical head device according to the embodiment of the present invention.
- an optical head device 100 includes a light source 101 that emits a light beam having a predetermined wavelength, a polarization beam splitter 102 that transmits or reflects light according to the polarization direction, and a collimator that converts the incident light beam into substantially parallel light.
- Return light refers to light that is emitted from the light source 101, reflected by the information recording surfaces 200a and 200b, and returned in the direction of the liquid crystal diffractive lens element 10.
- the light emitted from the light source 101 is transmitted through the polarizing beam splitter 102, the collimator lens 103, the liquid crystal diffractive lens element 10, the quarter wave plate 104, and the objective lens 105 in this order, and the two layers of the optical disk 200 are transmitted.
- the light is condensed on the information recording surface 200a or 200b, which is the information recording surface.
- the light beams collected on the information recording surface 200a or 200b of the optical disk 200 are reflected by the information recording surfaces 200a and 200b, respectively, and the objective lens 105, the quarter wave plate 104, the liquid crystal diffraction lens element 10, and the collimator.
- the light passes through the meter lens 103, is reflected by the polarization beam splitter 102, and enters the photodetector 106.
- the output electric signal from the photodetector 106 is used to generate a read signal, a focus error signal, and a tracking error signal of information recorded on the information recording surfaces 200a and 200b of the optical disc 200.
- the optical head device controls the lens in the optical axis direction based on the focus error signal (focus servo), and controls the lens in a direction substantially perpendicular to the optical axis based on the tracking error signal. Force provided with a mechanism (tracking servo) that is not shown in the configuration shown in Fig. 4.
- the light source 101 is composed of, for example, a semiconductor laser, and emits divergent light having a wavelength in the vicinity of 650 nm and linearly polarized light.
- the light source 101 described above has two semiconductor laser chips mounted on the same substrate in the same package, and is configured to form a so-called hybrid two-wavelength laser light source.
- Monolithic dual wavelength laser light source having two light emitting points that emit light (for example, JP 2004-39898 A See the publication. ) May be configured.
- the light source 101 emits divergent light having a wavelength near 650 nm and a wavelength near 780 nm and linearly polarized light, for example.
- the wavelengths near 650 nm and 780 nm mean wavelengths in the range of 630 nm to 670 nm and 760 nm to 800 nm, respectively. It can also be used as a blue semiconductor laser with a wavelength of around 405 nm, which is used in the Blu-ray and HDDVD standards. In this case, the wavelength near 405 nm means a wavelength in the range of 385 nm to 425 nm.
- the polarization beam splitter 102 the collimator lens 103, the quarter-wave plate 104, the objective lens 105, and the photodetector 106 are well known, and further description is omitted.
- the light emitted from the light source 101 passes through the polarization beam splitter 102, is made into a substantially parallel light beam by the collimator lens 103, and enters the liquid crystal diffractive lens element 10 as linearly polarized light.
- the direction of polarization of the light emitted from the light source 101 is the first compound provided on the side on which the outgoing light is incident, of the birefringent Fresnel lens members 3a and 3b of the liquid crystal diffractive lens element 10.
- the refractive Fresnel lens member 3a is designed to coincide with or be orthogonal to the extraordinary light refractive index direction.
- the light incident on the liquid crystal diffractive lens element 10 is transmitted with the focal length switched when a predetermined voltage signal is applied to the liquid crystal diffractive lens element 10, and the voltage signal is applied to the liquid crystal diffractive lens element 10. If not, the focal length is not switched and the polarization direction is changed by 90 degrees and transmitted, and enters the quarter-wave plate 104.
- the light incident on the quarter-wave plate 104 becomes circularly polarized light by the quarter-wave plate 104, and is condensed on the information recording surface 200 a or 200 b of the optical disc 200 by the object lens 105.
- the transmitted wavefront of the liquid crystal lens element 10 with respect to incident light is unchanged, and is focused on the information recording surface 200a of the optical disc 200 by the objective lens 105, and recording or reproduction is performed.
- a predetermined voltage is applied to the liquid crystal lens element 10
- the transmitted wavefront of the liquid crystal lens element 10 with respect to the incident light becomes a divergent wavefront of the concave lens, and is focused on the information recording surface 200b of the optical disc 200 by the objective lens 105 and recorded. Or regeneration is done. As a result, stable recording and playback of the two-layer optical disc 200 Can be realized.
- the return light from the optical disc 200 is transmitted through the objective lens 105, and is converted into linearly polarized light whose polarization direction is 90 degrees different from that of the incident light by the quarter-wave plate 104, and the liquid crystal diffractive lens element 1 Depending on the polarization direction and the voltage signal applied to the liquid crystal diffractive lens element 10 according to 0, the light is transmitted as it is or with the focal length switched.
- the light that has passed through the liquid crystal diffractive lens element 10 passes through the collimator lens 103, is reflected by the polarization beam splitter 102, enters the photodetector 106, and the information recorded in the photodetector 106 is converted into an electrical signal. Is done.
- the Blu-ray standard or the HDDVD standard it is necessary to correct the spherical aberration caused by the difference in the cover layer thickness even when recording or reproducing on each layer of the multilayer optical disc.
- By switching the focal position using a diffractive lens element it is possible to record or play back a multilayer optical disc using the same optical head device.
- liquid crystal diffractive lens element and the optical head device of the present invention will be specifically described with reference to the following examples.
- a liquid crystal diffractive lens element 10 according to the first embodiment of the present invention will be described with reference to FIG.
- a liquid crystal diffractive lens element 10 according to an embodiment of the present invention includes a pair of transparent substrates la and lb arranged in parallel, a liquid crystal 4 sandwiched between the pair of transparent substrates la and lb, and an electric field applied to the liquid crystal.
- Transparent electrodes 2a and 2b for applying, a first birefringent Fresnel lens member 3a formed between a first transparent substrate la and a liquid crystal 4 and having a Fresnel lens shape and made of a birefringent material; , A second birefringent Fresnel lens member 3b formed between the second transparent substrate lb facing the first transparent substrate la and the liquid crystal 4 and having the shape of a Fresnel lens and made of a birefringent material; Select one and five.
- a quartz glass plate was used as the transparent substrates la and lb.
- IT ⁇ was used as the material for the transparent electrodes 2a and 2b.
- the transparent electrodes 2a and 2b are formed by depositing IT ⁇ to a film thickness with a sheet resistance value of about 300 ⁇ by sputtering and patterning the film using photolithography and etching techniques. Went by.
- the extraordinary light refractive index n is 1 e.
- the extraordinary refractive index direction on the transparent substrate la side is the X-axis direction shown in Fig. 1
- the extraordinary optical refractive index direction on the transparent substrate lb side is the Y-axis direction shown in Fig. 1. It formed on transparent electrode 2a, 2b so that it might become.
- the transparent substrate la is the incident side
- the transparent substrate lb is the emission side.
- the polymer liquid crystal as the birefringent material does not twist the extraordinary refractive index direction with respect to the thickness direction.
- the polymer liquid crystal as the birefringent material was patterned using photolithography technology and etching technology to form each blaze ring.
- the wavelength of the light source 101 is set to 660 nm, and the phase shift distribution indicated by the reference numeral F2 shown in FIG. 3 is obtained for the thickness of each blaze wheel in the optical axis direction.
- a polyimide film (not shown) was formed as an alignment film on the surface of each birefringent Fresnel lens member 3a, 3b, and an alignment treatment was performed by a rubbing method.
- the rubbing direction was the extraordinary refractive index direction of the polymer liquid crystal of each birefringent Fresnel lens member 3a, 3b.
- the injection port is filled with an acrylic resin adhesive.
- the liquid crystal diffractive lens element 10 was produced by sealing.
- the transparent electrodes 2a and 2b are provided with the terminal extraction portions 22a and 22b, and the flexible circuit board is connected to the terminal extraction portions 22a and 22b.
- An external voltage signal source 20 that generates signals can now be connected.
- liquid crystal diffractive lens element 10 when linearly polarized laser light (polarized in the X-axis direction or Y-axis direction) with a wavelength of 660 nm is incident on the liquid crystal diffractive lens element 10 configured as described above. This will be described below.
- the liquid crystal 4 is oriented in the extraordinary refractive index directions A and B in the vicinity of the birefringent Fresnel lens members 3a and 3b.
- the extraordinary refractive index direction A X-axis direction
- n n
- the birefringent Fresnel lens member 3a does not function as a Fresnel lens, and incident light passes through the birefringent Fresnel lens member 3a as it is.
- the light that has passed through the birefringent Fresnel lens member 3a is incident on the liquid crystal 4 that is twisted 90 degrees continuously to the birefringent Fresnel lens member 3b side so that the polarization direction is rotated by 90 degrees.
- the birefringent Fresnel lens member 3b does not function as a Fresnel lens because it feels the same extraordinary refractive index and passes through the birefringent Fresnel lens member 3b as it is.
- light polarized in the X-axis direction and traveling in the Z-axis direction passes through the liquid crystal diffractive lens element without receiving the lens effect, although the polarization direction changes in the Y-axis direction.
- the light polarized in the Y-axis direction and traveling in the Z-axis direction operates as follows.
- the lens member 3a does not function as a Fresnel lens, and incident light passes through the birefringent Fresnel lens member 3a as it is.
- the light that has passed through the birefringent Fresnel lens member 3a is deflected because the liquid crystal 4 is continuously twisted and twisted 90 degrees to the birefringent Fresnel lens member 3b side. Incident light is rotated 90 degrees.
- the birefringent Fresnel lens member 3b does not function as a Fresnel lens, and passes through the birefringent Fresnel lens member 3b as it is.
- the light polarized in the Y-axis direction and traveling in the Z-axis direction passes through the liquid crystal diffractive lens element without receiving the lens effect, although the polarization direction changes in the X-axis direction. Therefore, when no voltage is applied, the incident light passes through the liquid crystal diffractive lens element 10 as it is regardless of whether the polarization direction is the X-axis direction force or the Y-axis direction.
- the birefringent Fresnel lens member 3a receives the action of the birefringent Fresnel lens member 3a and emits divergent light.
- the light polarized in the Y-axis direction and traveling in the Z-axis direction acts as follows. That is, when light polarized in the Y-axis direction and traveling in the Z-axis direction is incident on the liquid crystal diffractive lens element 10, the liquid crystal 4 side and the birefringent Fresnel lens are formed at the interface between the liquid crystal 4 and the birefringent Fresnel lens member 3a.
- the light polarized in the Y-axis direction and traveling in the Z-axis direction was subjected to the action of the birefringent Fresnel lens member 3b and passed through the liquid crystal diffractive lens element 10 as divergent light.
- the linearly polarized light polarized in the X-axis direction and the linearly polarized light polarized in the Y-axis direction are both through when the voltage is not applied (applied voltage is 0V).
- a liquid crystal diffractive lens element 10 that can be switched to become divergent light when passing through the element 10 and applying a voltage having an effective value of lOVrms was obtained.
- FIG. 4 is an enlarged view of the cross section thereof.
- a quartz glass substrate with a refractive index of 1.46 and a thickness of 0.7 mm is used, and the depth of each annular zone is measured by photolithography and etching technology on one side. Is then etched into a 3.6 ⁇ m Fresnel lens shape to produce refractive index adjusters 3a2 and 3b2.
- an ITO film (not shown) having a sheet resistance value of 300 ⁇ / port is formed as a transparent electrode on the refractive index adjusting portions 3a2 and 3b2 by using a sputtering method, and is formed by photolithography, Electrodes are fabricated by patterning ITO using an etching technique.
- an extraordinary refractive index (n) 1.77
- an ordinary refractive index e as a birefringent material on the ITO film surface.
- Polymer liquid crystals with a ratio (n) 1 ⁇ 55 are formed to a film thickness of 3 ⁇ 0 / im, and birefringent Fresnel lens members 3al and 3bl shown in FIG. 4 are produced by photolithography and etching techniques.
- the birefringent Fresnel lens member 3al is aligned in the X-axis direction
- the birefringent Fresnel lens member 3bl is aligned in the Y-axis direction (polymeric liquid crystal refractive index direction).
- polyimide is formed as an alignment film on the surface of the birefringent Fresnel lens members 3al and 3bl (not shown), and the rubbing method is performed so that the alignment treatment direction of the polymer liquid crystal surface becomes the extraordinary refractive index direction of the polymer liquid crystal.
- the orientation treatment is performed by
- a seal 5 made of an epoxy adhesive mixed with a fiber spacer having a diameter of 40 zm is printed on the outer periphery, and thermocompression bonded to produce a cell with a substrate gap of 40 ⁇ m.
- a chiral material is added to the cell by vacuum injection so that the ordinary light refractive index is 1.5, the extraordinary light refractive index is 1.6, the dielectric anisotropy is ( ⁇ ⁇ ) and the chiral pitch is 200 ⁇ .
- the nematic liquid crystal thus prepared is injected, and the injection port is sealed with an acrylic adhesive to produce a liquid crystal diffractive lens element 30.
- a liquid crystal diffractive lens element 40 according to a third embodiment of the present invention will be described with reference to FIG.
- a film with a sheet resistance value of 300 ⁇ Z is used as a transparent electrode.
- the transparent electrodes 2a and 2b are formed by forming a film and patterning the film by photolithography and etching technology.
- the opposite surface of the transparent substrate lb on which the ITO film is formed is processed into a Fresnel lens shape with a depth of 0.29 / im by photolithography and etching technology to produce the phase adjustment surface 6 shown in FIG.
- an extraordinary refractive index (n) 1.77
- an ordinary refractive index e as a birefringent material on the ITO film surface.
- Polymer liquid crystals with a ratio (n) 1 ⁇ 55 are formed to a thickness of 3.3 / m, and birefringent Fresnel lens members 3a and 3b shown in FIG. 5 are produced by photolithography and etching techniques.
- the birefringent Fresnel lens member 3a is aligned in the X-axis direction
- the birefringent Fresnel lens member 3b is aligned in the Y-axis direction (polymeric liquid crystal refractive index direction).
- a polyimide film is formed as an alignment film on the surface of the birefringent Fresnel lens members 3a and 3b (not shown), and the rubbing method is performed so that the alignment treatment direction of the polymer liquid crystal surface becomes the extraordinary refractive index direction of the polymer liquid crystal.
- the orientation treatment is performed by
- a seal 5 made of an epoxy adhesive mixed with a fiber spacer having a diameter of 40 zm is printed on the outer periphery, and thermocompression bonded to produce a cell having a substrate gap of 40 ⁇ m.
- a chiral material is obtained by vacuum injection into this cell so that the ordinary light refractive index is 1.51, the extraordinary light refractive index is 1.73, the dielectric anisotropy is ( ⁇ ) 10, and the chiral pitch is 200 ⁇ .
- the added nematic liquid crystal is injected, and the injection port is sealed with an acrylic adhesive to produce a liquid crystal diffractive lens element 40.
- FIG. 10 is a cross-sectional view of a liquid crystal diffractive lens element 50 according to a fourth embodiment of the present invention.
- phase adjustment unit 9 is different, but the other configurations are the same.
- the opposite surface of the quartz glass substrate, which is a transparent substrate lb, to the IT film-forming surface is processed into a Fresnel lens shape with a depth of 3 ⁇ m by photolithography and etching technology to produce the phase adjustment surface 8a shown in Fig. 6.
- an acrylic photo-curing adhesive having a refractive index of 1.504 is used as the filler 8b, filling the concave portion of the phase adjusting surface 8a, and a transparent substrate lc made of quartz glass having a thickness of 0.3 mm. Tie together.
- An optical head device 100 includes a light source 101 that emits a light beam having a predetermined wavelength, a polarization beam splitter 102 that transmits or reflects light according to the polarization direction, and an incident light beam that is substantially parallel light.
- the collimator lens 103 to be converted, the liquid crystal diffractive lens element 10, the 1Z4 wavelength plate 104, the objective lens 105 for condensing the light transmitted through the 1Z4 wavelength plate 104 onto the optical disc 200, and the polarization beam splitter 102 are reflected.
- a photodetector 106 for detecting return light from the optical disc 200.
- the objective lens 105 condenses the incident light on the first information recording surface 200a when the incident light passes through the liquid crystal diffractive lens element 10 through.
- the optical head device 100 operates substantially in the same manner as when the liquid crystal diffractive lens element 10 is removed, and the incident light is the first light. Condensed on the information recording surface 200a.
- the light incident on the liquid crystal diffractive lens element 10 is diverged by the focal length being switched by the liquid crystal diffractive lens element 10.
- the light passes through the liquid crystal diffractive lens element 10, passes through the 1Z4 wavelength plate 104 and the objective lens 105, and is condensed on the second information recording surface 200 b of the optical disc 200.
- the return light from the optical disc 200 passes through the objective lens 105 and is converted into linearly polarized light whose polarization direction is 90 degrees different from that of the incident light by the quarter-wave plate 104, and is focused by the liquid crystal diffractive lens element 10. The distance is switched and transmitted.
- the light transmitted through the liquid crystal diffractive lens element 10 passes through the collimator lens 103, is reflected by the polarization beam splitter 102, enters the photodetector 106, and the information recorded in the photodetector 106 is converted into an electrical signal. Is done.
- the liquid crystal diffractive lens element switches the first birefringent Fresnel lens member and the second birefringent lens member by switching the orientation direction of the liquid crystal by applying an electric field to the liquid crystal. Since the birefringent Fresnel lens member functions as a Fresnel lens for light having orthogonal polarization directions, the focal distances of both the forward light and the backward light can be switched with one element.
- the polymer liquid crystal is used as the birefringent material of at least one of the birefringent Fresnel lens members, the birefringent Fresnel lens member can be easily formed, the refractive index can be adjusted, and the polymer liquid crystal can be adjusted.
- the degree of freedom in design is high due to the large amount of nori- cation.
- the birefringence Fresnel lens member functions as a Fresnel lens can be switched by switching on and off the applied voltage, the applied voltage can be easily controlled.
- the focal length can be converted at the same magnification.
- the extraordinary refractive index direction of the birefringent Fresnel lens member is twisted with respect to the direction perpendicular to the substrate surface, the orientation of the liquid crystal in the concavo-convex portion of the birefringent Fresnel lens member.
- Direction and the extraordinary refractive index direction can be matched, and the function as a Fresnel lens can be more suitably exhibited.
- liquid crystal diffractive lens element and the phase plate are integrated, adjustment is easy and space saving can be achieved.
- the function as a Fresnel lens is further improved. It can exhibit suitably.
- optical head device has any one or more of the above effects, and can improve the light utilization efficiency.
- the first birefringent Fresnel lens member serves as the Fresnel lens.
- the function can be more suitably exhibited.
- the liquid crystal diffractive lens element and the optical head device according to the present invention have a useful effect that the focal lengths of both the forward path light and the backward path light can be switched by one element. Useful as such. It should be noted that the entire contents of the Akita book, No. 2004-304249 filed on October 19, 2004, the claims, drawings, and abstract are incorporated herein as the disclosure of the present invention. It is.
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2006542975A JP4692489B2 (ja) | 2004-10-19 | 2005-10-17 | 液晶回折レンズ素子および光ヘッド装置 |
US11/737,177 US7710536B2 (en) | 2004-10-19 | 2007-04-19 | Liquid crystal diffraction lens element and optical head device |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2004-304249 | 2004-10-19 | ||
JP2004304249 | 2004-10-19 |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/737,177 Continuation US7710536B2 (en) | 2004-10-19 | 2007-04-19 | Liquid crystal diffraction lens element and optical head device |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2006043516A1 true WO2006043516A1 (ja) | 2006-04-27 |
Family
ID=36202931
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2005/019062 WO2006043516A1 (ja) | 2004-10-19 | 2005-10-17 | 液晶回折レンズ素子および光ヘッド装置 |
Country Status (6)
Country | Link |
---|---|
US (1) | US7710536B2 (ja) |
JP (1) | JP4692489B2 (ja) |
KR (1) | KR20070065317A (ja) |
CN (1) | CN100587819C (ja) |
TW (1) | TW200622407A (ja) |
WO (1) | WO2006043516A1 (ja) |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1688783A1 (en) * | 2003-11-27 | 2006-08-09 | Asahi Glass Company Ltd. | Optical element using liquid crystal having optical isotropy |
JP2008065888A (ja) * | 2006-09-06 | 2008-03-21 | Hitachi Media Electoronics Co Ltd | 光ピックアップ装置及び光ディスク装置 |
WO2008136315A1 (en) * | 2007-04-26 | 2008-11-13 | Ricoh Company, Ltd. | Optical pickup and optical information processing device |
JP2009528565A (ja) * | 2006-03-03 | 2009-08-06 | コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ | 3d/2dモード切替のために制御可能な液晶レンズを使用するオートステレオスコピック表示装置 |
CN101833219A (zh) * | 2010-06-11 | 2010-09-15 | 华映视讯(吴江)有限公司 | 液晶透镜 |
WO2018169093A1 (ja) * | 2017-03-17 | 2018-09-20 | 大日本印刷株式会社 | 回折光学素子 |
JP2019070784A (ja) * | 2017-03-17 | 2019-05-09 | 大日本印刷株式会社 | 回折光学素子 |
JP2021529348A (ja) * | 2018-06-27 | 2021-10-28 | メルク・パテント・ゲゼルシヤフト・ミツト・ベシユレンクテル・ハフツングMerck Patent GmbH | 光学素子の改良および光学素子に関連する改良 |
Families Citing this family (71)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP4341332B2 (ja) * | 2002-07-31 | 2009-10-07 | 旭硝子株式会社 | 光ヘッド装置 |
KR101047830B1 (ko) * | 2004-04-30 | 2011-07-08 | 아사히 가라스 가부시키가이샤 | 액정 렌즈 소자 및 광헤드 장치 |
WO2006009176A1 (ja) * | 2004-07-20 | 2006-01-26 | Asahi Glass Company, Limited | 液晶レンズ素子および光ヘッド装置 |
WO2006013901A1 (ja) * | 2004-08-04 | 2006-02-09 | Asahi Glass Company, Limited | 液晶レンズ素子および光ヘッド装置 |
WO2006043516A1 (ja) | 2004-10-19 | 2006-04-27 | Asahi Glass Company, Limited | 液晶回折レンズ素子および光ヘッド装置 |
US20070216851A1 (en) * | 2006-03-01 | 2007-09-20 | Citizen Watch Co., Ltd. | Liquid crystal lens and imaging lens device |
GB0718706D0 (en) | 2007-09-25 | 2007-11-07 | Creative Physics Ltd | Method and apparatus for reducing laser speckle |
JP2008052837A (ja) * | 2006-08-25 | 2008-03-06 | Funai Electric Co Ltd | 球面収差補正素子及びそれを用いた光ピックアップ装置 |
US20100085860A1 (en) * | 2007-03-28 | 2010-04-08 | Ryuichi Katayama | Optical head device, and optical information recording/reproducing device and optical information recording/reproducing method using the same |
US8305550B2 (en) * | 2007-07-11 | 2012-11-06 | Lg Display Co., Ltd. | Electrically-driven liquid crystal lens and stereoscopic device using the same |
CN101911191B (zh) * | 2007-12-27 | 2012-10-24 | 旭硝子株式会社 | 液晶元件及光头装置及可变光调制元件 |
KR100887612B1 (ko) * | 2008-02-29 | 2009-03-10 | 주식회사 엘엠에스 | 광대역 위상지연소자의 제조방법 및 이를 포함하는 광픽업 장치 |
TW201011350A (en) * | 2008-09-04 | 2010-03-16 | E Pin Optical Industry Co Ltd | Liquid crystal zoom lens |
CN101672990B (zh) * | 2008-09-10 | 2012-04-25 | 一品光学工业股份有限公司 | 一种变焦液晶透镜 |
JP4776669B2 (ja) * | 2008-09-25 | 2011-09-21 | 株式会社東芝 | 表示装置および移動体 |
EP2187392A1 (en) * | 2008-11-18 | 2010-05-19 | Thomson Licensing | Apparatus for writing to an optical recording medium |
US11726332B2 (en) | 2009-04-27 | 2023-08-15 | Digilens Inc. | Diffractive projection apparatus |
US9335604B2 (en) | 2013-12-11 | 2016-05-10 | Milan Momcilo Popovich | Holographic waveguide display |
EP2343589A1 (en) * | 2010-01-05 | 2011-07-13 | Realview Innovations Limited | Improvements in depth-enhancing screens |
TWI484224B (zh) * | 2010-03-23 | 2015-05-11 | Univ Nat Central | 液晶透鏡之製造方法、以此方法所製得之液晶透鏡、以及液晶配向基板 |
KR101039325B1 (ko) * | 2010-09-08 | 2011-06-08 | 주식회사 엘엠에스 | 위상지연소자 |
JP5286349B2 (ja) * | 2010-12-27 | 2013-09-11 | 株式会社東芝 | 屈折率分布型液晶光学素子および画像表示装置 |
US9274349B2 (en) | 2011-04-07 | 2016-03-01 | Digilens Inc. | Laser despeckler based on angular diversity |
US10670876B2 (en) | 2011-08-24 | 2020-06-02 | Digilens Inc. | Waveguide laser illuminator incorporating a despeckler |
EP2748670B1 (en) | 2011-08-24 | 2015-11-18 | Rockwell Collins, Inc. | Wearable data display |
WO2016020630A2 (en) | 2014-08-08 | 2016-02-11 | Milan Momcilo Popovich | Waveguide laser illuminator incorporating a despeckler |
TWI424199B (zh) * | 2011-09-28 | 2014-01-21 | Chunghwa Picture Tubes Ltd | 液晶透鏡 |
US9709829B2 (en) * | 2011-11-18 | 2017-07-18 | Vuzix Corporation | Beam steering device |
JP5591783B2 (ja) * | 2011-11-25 | 2014-09-17 | パナソニック株式会社 | 画像表示装置 |
US20150010265A1 (en) | 2012-01-06 | 2015-01-08 | Milan, Momcilo POPOVICH | Contact image sensor using switchable bragg gratings |
KR20130107953A (ko) * | 2012-03-23 | 2013-10-02 | 삼성디스플레이 주식회사 | 영상 표시 장치 |
US9103992B1 (en) * | 2012-11-01 | 2015-08-11 | Capella Photonics, Inc. | Flexible bandwidth wavelength selective switch |
US9933684B2 (en) * | 2012-11-16 | 2018-04-03 | Rockwell Collins, Inc. | Transparent waveguide display providing upper and lower fields of view having a specific light output aperture configuration |
TWI603131B (zh) * | 2013-02-07 | 2017-10-21 | 源奇科技股份有限公司 | 眼鏡結構 |
US20150219893A1 (en) | 2013-02-07 | 2015-08-06 | Liqxtal Technology Inc. | Optical system and its display system |
EP2963503B1 (en) * | 2013-03-01 | 2020-05-20 | Citizen Watch Co., Ltd. | Luminous flux splitting element |
JP2014182215A (ja) * | 2013-03-18 | 2014-09-29 | Japan Display Inc | 液晶装置及び電子機器 |
US9727772B2 (en) | 2013-07-31 | 2017-08-08 | Digilens, Inc. | Method and apparatus for contact image sensing |
US10359736B2 (en) | 2014-08-08 | 2019-07-23 | Digilens Inc. | Method for holographic mastering and replication |
KR20160029245A (ko) * | 2014-09-04 | 2016-03-15 | 삼성디스플레이 주식회사 | 헤드 마운트 디스플레이 장치 |
WO2016042283A1 (en) | 2014-09-19 | 2016-03-24 | Milan Momcilo Popovich | Method and apparatus for generating input images for holographic waveguide displays |
CN107873086B (zh) | 2015-01-12 | 2020-03-20 | 迪吉伦斯公司 | 环境隔离的波导显示器 |
US9632226B2 (en) | 2015-02-12 | 2017-04-25 | Digilens Inc. | Waveguide grating device |
WO2016135434A1 (en) * | 2015-02-23 | 2016-09-01 | Milan Momcilo Popovich | Electrically focus-tunable lens |
NZ773820A (en) | 2015-03-16 | 2022-07-29 | Magic Leap Inc | Methods and systems for diagnosing and treating health ailments |
EP3115436A1 (en) * | 2015-07-08 | 2017-01-11 | Essilor International (Compagnie Generale D'optique) | Method for obtaining a material comprising a liquid crystal mix with a stabilized blue phase and optical article comprising this material |
US9816687B2 (en) * | 2015-09-24 | 2017-11-14 | Intel Corporation | MEMS LED zoom |
WO2017060665A1 (en) | 2015-10-05 | 2017-04-13 | Milan Momcilo Popovich | Waveguide display |
JP6895451B2 (ja) | 2016-03-24 | 2021-06-30 | ディジレンズ インコーポレイテッド | 偏光選択ホログラフィー導波管デバイスを提供するための方法および装置 |
WO2017176898A1 (en) | 2016-04-08 | 2017-10-12 | Magic Leap, Inc. | Augmented reality systems and methods with variable focus lens elements |
JP6734933B2 (ja) | 2016-04-11 | 2020-08-05 | ディジレンズ インコーポレイテッド | 構造化光投影のためのホログラフィック導波管装置 |
KR101976640B1 (ko) * | 2016-10-19 | 2019-05-09 | 경북대학교 산학협력단 | 유연 액정 프레넬 렌즈 |
US10495921B2 (en) | 2016-10-19 | 2019-12-03 | Kyungpook National University Industry-Academic Cooperation Foundation | Flexible liquid crystal lens |
WO2018102834A2 (en) | 2016-12-02 | 2018-06-07 | Digilens, Inc. | Waveguide device with uniform output illumination |
US10545346B2 (en) | 2017-01-05 | 2020-01-28 | Digilens Inc. | Wearable heads up displays |
JP7158396B2 (ja) | 2017-02-23 | 2022-10-21 | マジック リープ, インコーポレイテッド | 可変屈折力反射体を有するディスプレイシステム |
CN107479248A (zh) | 2017-09-28 | 2017-12-15 | 京东方科技集团股份有限公司 | 一种衍射装置 |
EP3698214A4 (en) | 2017-10-16 | 2021-10-27 | Digilens Inc. | SYSTEMS AND METHODS FOR MULTIPLICATION OF THE IMAGE RESOLUTION OF A PIXELIZED DISPLAY |
CN108037598A (zh) | 2017-11-23 | 2018-05-15 | 京东方科技集团股份有限公司 | 液晶盒及拍摄系统 |
US10914950B2 (en) | 2018-01-08 | 2021-02-09 | Digilens Inc. | Waveguide architectures and related methods of manufacturing |
KR20200108030A (ko) | 2018-01-08 | 2020-09-16 | 디지렌즈 인코포레이티드. | 도파관 셀 내의 홀로그래픽 격자의 높은 처리능력의 레코딩을 위한 시스템 및 방법 |
US11402801B2 (en) | 2018-07-25 | 2022-08-02 | Digilens Inc. | Systems and methods for fabricating a multilayer optical structure |
CN109683422B (zh) * | 2019-01-30 | 2022-05-20 | 京东方科技集团股份有限公司 | 一种液晶透镜及其制备方法 |
JP2022520472A (ja) | 2019-02-15 | 2022-03-30 | ディジレンズ インコーポレイテッド | 統合された格子を使用してホログラフィック導波管ディスプレイを提供するための方法および装置 |
KR20210134763A (ko) | 2019-03-12 | 2021-11-10 | 디지렌즈 인코포레이티드. | 홀로그래픽 도파관 백라이트 및 관련된 제조 방법 |
KR20220016990A (ko) | 2019-06-07 | 2022-02-10 | 디지렌즈 인코포레이티드. | 투과 및 반사 격자를 통합하는 도파관 및 관련 제조 방법 |
CN110187585A (zh) * | 2019-06-21 | 2019-08-30 | 京东方科技集团股份有限公司 | 一种液晶光学镜片及虚拟现实显示装置 |
JP2022543571A (ja) | 2019-07-29 | 2022-10-13 | ディジレンズ インコーポレイテッド | 画素化されたディスプレイの画像解像度および視野を乗算するための方法および装置 |
EP4022370A4 (en) | 2019-08-29 | 2023-08-30 | Digilens Inc. | VACUUM BRAGG GRATINGS AND METHODS OF MANUFACTURING |
TW202136871A (zh) | 2020-02-13 | 2021-10-01 | 德商馬克專利公司 | 液晶裝置 |
TW202136481A (zh) | 2020-02-13 | 2021-10-01 | 德商馬克專利公司 | 液晶裝置 |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS62170934A (ja) * | 1986-01-24 | 1987-07-28 | Olympus Optical Co Ltd | 液晶レンズ |
JPH1092003A (ja) * | 1996-09-18 | 1998-04-10 | Asahi Glass Co Ltd | 光ヘッド装置及びそれに用いる液晶レンズ |
JP2002357804A (ja) * | 2001-06-01 | 2002-12-13 | Nippon Hoso Kyokai <Nhk> | 回折型液晶レンズ及び多焦点回折型液晶レンズ |
JP2004101885A (ja) * | 2002-09-10 | 2004-04-02 | Pioneer Electronic Corp | 液晶レンズ並びにその駆動方法及び装置 |
Family Cites Families (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP3241781B2 (ja) * | 1991-08-22 | 2001-12-25 | 松下電器産業株式会社 | 光ヘッド装置および光情報記録装置、光情報再生装置 |
DE69632290T2 (de) * | 1995-02-28 | 2005-05-25 | Koninklijke Philips Electronics N.V. | Elektrooptische vorrichtung |
JP3656131B2 (ja) * | 1996-02-23 | 2005-06-08 | 旭硝子株式会社 | 光ヘッド装置 |
WO1999018459A1 (fr) * | 1997-10-02 | 1999-04-15 | Asahi Glass Company Ltd. | Tete optique et element de diffraction conçu pour cette tete optique, et procede de fabrication de l'element de diffraction et de la tete optique |
JP4343337B2 (ja) * | 1999-07-23 | 2009-10-14 | シチズンホールディングス株式会社 | 光学装置 |
JP4341332B2 (ja) * | 2002-07-31 | 2009-10-07 | 旭硝子株式会社 | 光ヘッド装置 |
EP1602964A4 (en) * | 2003-03-07 | 2008-08-13 | Asahi Glass Co Ltd | OPTICAL ATTENUATOR AND OPTICAL HEAD DEVICE |
WO2005076265A1 (ja) * | 2004-02-03 | 2005-08-18 | Asahi Glass Company, Limited | 液晶レンズ素子および光ヘッド装置 |
KR101047830B1 (ko) * | 2004-04-30 | 2011-07-08 | 아사히 가라스 가부시키가이샤 | 액정 렌즈 소자 및 광헤드 장치 |
KR20070034578A (ko) * | 2004-07-15 | 2007-03-28 | 아사히 가라스 가부시키가이샤 | 액정 렌즈 소자 및 광헤드 장치 |
WO2006009176A1 (ja) * | 2004-07-20 | 2006-01-26 | Asahi Glass Company, Limited | 液晶レンズ素子および光ヘッド装置 |
WO2006043516A1 (ja) | 2004-10-19 | 2006-04-27 | Asahi Glass Company, Limited | 液晶回折レンズ素子および光ヘッド装置 |
-
2005
- 2005-10-17 WO PCT/JP2005/019062 patent/WO2006043516A1/ja active Application Filing
- 2005-10-17 KR KR1020077005419A patent/KR20070065317A/ko not_active Application Discontinuation
- 2005-10-17 CN CN200580035229A patent/CN100587819C/zh not_active Expired - Fee Related
- 2005-10-17 JP JP2006542975A patent/JP4692489B2/ja not_active Expired - Fee Related
- 2005-10-19 TW TW094136566A patent/TW200622407A/zh unknown
-
2007
- 2007-04-19 US US11/737,177 patent/US7710536B2/en not_active Expired - Fee Related
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS62170934A (ja) * | 1986-01-24 | 1987-07-28 | Olympus Optical Co Ltd | 液晶レンズ |
JPH1092003A (ja) * | 1996-09-18 | 1998-04-10 | Asahi Glass Co Ltd | 光ヘッド装置及びそれに用いる液晶レンズ |
JP2002357804A (ja) * | 2001-06-01 | 2002-12-13 | Nippon Hoso Kyokai <Nhk> | 回折型液晶レンズ及び多焦点回折型液晶レンズ |
JP2004101885A (ja) * | 2002-09-10 | 2004-04-02 | Pioneer Electronic Corp | 液晶レンズ並びにその駆動方法及び装置 |
Cited By (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1688783B1 (en) * | 2003-11-27 | 2009-10-14 | Asahi Glass Company Ltd. | Optical element using liquid crystal having optical isotropy |
EP1688783A1 (en) * | 2003-11-27 | 2006-08-09 | Asahi Glass Company Ltd. | Optical element using liquid crystal having optical isotropy |
JP2009528565A (ja) * | 2006-03-03 | 2009-08-06 | コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ | 3d/2dモード切替のために制御可能な液晶レンズを使用するオートステレオスコピック表示装置 |
JP2008065888A (ja) * | 2006-09-06 | 2008-03-21 | Hitachi Media Electoronics Co Ltd | 光ピックアップ装置及び光ディスク装置 |
US8259555B2 (en) | 2007-04-26 | 2012-09-04 | Ricoh Company, Ltd. | Optical pickup and optical information processing device |
WO2008136315A1 (en) * | 2007-04-26 | 2008-11-13 | Ricoh Company, Ltd. | Optical pickup and optical information processing device |
CN101833219A (zh) * | 2010-06-11 | 2010-09-15 | 华映视讯(吴江)有限公司 | 液晶透镜 |
WO2018169093A1 (ja) * | 2017-03-17 | 2018-09-20 | 大日本印刷株式会社 | 回折光学素子 |
JP2019070784A (ja) * | 2017-03-17 | 2019-05-09 | 大日本印刷株式会社 | 回折光学素子 |
CN110418986A (zh) * | 2017-03-17 | 2019-11-05 | 大日本印刷株式会社 | 衍射光学元件 |
US11366256B2 (en) | 2017-03-17 | 2022-06-21 | Dai Nippon Printing Co., Ltd. | Diffractive optical element |
TWI772387B (zh) * | 2017-03-17 | 2022-08-01 | 日商大日本印刷股份有限公司 | 繞射光學元件 |
JP7196406B2 (ja) | 2017-03-17 | 2022-12-27 | 大日本印刷株式会社 | 回折光学素子 |
JP2021529348A (ja) * | 2018-06-27 | 2021-10-28 | メルク・パテント・ゲゼルシヤフト・ミツト・ベシユレンクテル・ハフツングMerck Patent GmbH | 光学素子の改良および光学素子に関連する改良 |
JP7453161B2 (ja) | 2018-06-27 | 2024-03-19 | メルク・パテント・ゲゼルシヤフト・ミツト・ベシユレンクテル・ハフツング | 光学素子の改良および光学素子に関連する改良 |
Also Published As
Publication number | Publication date |
---|---|
JPWO2006043516A1 (ja) | 2008-05-22 |
US7710536B2 (en) | 2010-05-04 |
JP4692489B2 (ja) | 2011-06-01 |
CN100587819C (zh) | 2010-02-03 |
US20070182915A1 (en) | 2007-08-09 |
TW200622407A (en) | 2006-07-01 |
KR20070065317A (ko) | 2007-06-22 |
CN101040336A (zh) | 2007-09-19 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JP4692489B2 (ja) | 液晶回折レンズ素子および光ヘッド装置 | |
JP4479726B2 (ja) | 液晶レンズ素子および光ヘッド装置 | |
JP4720507B2 (ja) | 液晶レンズ素子および光ヘッド装置 | |
JP4752763B2 (ja) | 液晶レンズ素子および光ヘッド装置 | |
WO2006009176A1 (ja) | 液晶レンズ素子および光ヘッド装置 | |
KR20070035043A (ko) | 액정 렌즈 소자 및 광헤드 장치 | |
JP4501611B2 (ja) | 液晶レンズ素子および光ヘッド装置 | |
JP4508048B2 (ja) | 液晶レンズおよび光ヘッド装置 | |
JP2004355790A (ja) | ホログラム結合体およびその製造方法、ホログラムレーザユニットならびに光ピックアップ装置 | |
JP2006512712A (ja) | 制御可能な2層複屈折光コンポーネント | |
JP4552556B2 (ja) | 液晶レンズ素子および光ヘッド装置 | |
JP2009015995A (ja) | 液晶回折レンズ素子および光ヘッド装置 | |
JP3624561B2 (ja) | 光変調素子及び光ヘッド装置 | |
JP4622160B2 (ja) | 回折格子一体型旋光子および光ヘッド装置 | |
JP4478398B2 (ja) | 偏光光学素子、光学素子ユニット、光ヘッド装置及び光ディスクドライブ装置 | |
JP4207550B2 (ja) | 光ヘッド装置 | |
JP4168680B2 (ja) | 光ヘッド装置 | |
JP4085527B2 (ja) | 光ヘッド装置 | |
JP4599763B2 (ja) | 光ヘッド装置 | |
JP4427877B2 (ja) | 開口制限素子および光ヘッド装置 | |
JP2010238350A (ja) | 光ヘッド装置 | |
JP4696883B2 (ja) | 位相補正素子および光ヘッド装置 | |
JP2006099946A (ja) | 光ヘッド装置 | |
JP2005353207A (ja) | 偏光ホログラム素子、光ピックアップ装置及びこれらの製造方法 | |
JP4396341B2 (ja) | 光ヘッド装置 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AK | Designated states |
Kind code of ref document: A1 Designated state(s): AE AG AL AM AT AU AZ BA BB BG BR BW BY BZ CA CH CN CO CR CU CZ DE DK DM DZ EC EE EG ES FI GB GD GE GH GM HR HU ID IL IN IS JP KE KG KM KP KR KZ LC LK LR LS LT LU LV LY MA MD MG MK MN MW MX MZ NA NG NI NO NZ OM PG PH PL PT RO RU SC SD SE SG SK SL SM SY TJ TM TN TR TT TZ UA UG US UZ VC VN YU ZA ZM ZW |
|
AL | Designated countries for regional patents |
Kind code of ref document: A1 Designated state(s): GM KE LS MW MZ NA SD SL SZ TZ UG ZM ZW AM AZ BY KG KZ MD RU TJ TM AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LT LU LV MC NL PL PT RO SE SI SK TR BF BJ CF CG CI CM GA GN GQ GW ML MR NE SN TD TG |
|
DPEN | Request for preliminary examination filed prior to expiration of 19th month from priority date (pct application filed from 20040101) | ||
121 | Ep: the epo has been informed by wipo that ep was designated in this application | ||
WWE | Wipo information: entry into national phase |
Ref document number: 2006542975 Country of ref document: JP |
|
WWE | Wipo information: entry into national phase |
Ref document number: 1020077005419 Country of ref document: KR |
|
WWE | Wipo information: entry into national phase |
Ref document number: 200580035229.8 Country of ref document: CN |
|
WWE | Wipo information: entry into national phase |
Ref document number: 11737177 Country of ref document: US |
|
NENP | Non-entry into the national phase |
Ref country code: DE |
|
WWP | Wipo information: published in national office |
Ref document number: 11737177 Country of ref document: US |
|
122 | Ep: pct application non-entry in european phase |
Ref document number: 05793590 Country of ref document: EP Kind code of ref document: A1 |