88results about "Optical recording/reproducing" patented technology

Example systems, data storage devices, and methods for using a harmonic sensor in the read channel of a data storage device to determine phase error are described. The data storage device includes a storage medium with data tracks and a head that can be positioned for reading and writing those tracks. A tone pattern may be written to a data track and a read signal from the tone pattern may subsequently be processed through the harmonic sensor to acquire amplitude data corresponding differences between a target frequency of the tone pattern and a read frequency from the read signal. The amplitude data may be processed to determine phase error values that correspond to an operating condition during writing, such as mode hops and / or down track thermal gradients related to operation of a laser during heat assisted magnetic recording.

To provide a glass that can suppress the deformation of a glass substrate, is excellent in moldability, and has a low burden on manufacturing equipment.SOLUTION: Provided is an alkali-free glass in which thermal expansion coefficient, Young's modulus, strain point, temperature T4 at which viscosity is 104 dPa s, glass surface devitrification temperature, and temperature T2 at which viscosity is 102 dPa s are within specified range, and contained amount of SiO2, Al2O3, B2O3, MgO, CaO, SrO, and BaO, MgO+CaO+SrO+BaO, and MgO / CaO are within specified range.SELECTED DRAWING: None

An alkali-free glass sheet according to the present invention contains, as a glass composition, in mol %, from 60% to 80% of SiO2, from 12% to 15% of Al2O3, from 1.2% to 4% of B2O3, from 0% to 0.5% of Li2O+Na2O+K2O, from 2% to 8% of MgO, from 2% to 11% of CaO, from 0% to 5% of SrO, from 0% to 5% of BaO, and from 10% to 16% of MgO+CaO+SrO+BaO, in which a mol % ratio B2O3 / Al2O3 is from 0.1 to 0.3, a mol % ratio (B2O3+BaO) / SiO2 is from 0.01 to 0.1, and MgO+CaO+SrO+BaO—Al2O3 is from −2% to +2%.

A light source device includes a light source; a light receiver; a lens disposed on a light-emitting side of the light source; a lens barrel configured to retain the lens; and a half mirror attached to the lens barrel and disposed to face the lens. The lens includes a first lens surface facing the light source and a second lens surface facing the half mirror. The first lens surface includes a first portion configured to receive light from the light source and direct it to the half-mirror through the second lens surface, and a light-focusing portion provided in a region of the first lens surface outside the first portion, such light-focusing portion configured to focus light that is reflected by the half mirror towards the second lens surface and retransmitted through the lens, towards the light receiver.

An interferometric scattering microscope comprising: a solid immersion lens provided in a sample solution comprising an object, wherein an interaction between the object and the surface of the solid immersion lens arises; an illumination source; a detector; and an optical system arranged to direct illuminating light from the illumination source onto the surface of the solid immersion lens, collect output light from the surface of the solid immersion lens and to direct the output light to the detector, is provided.

The present specification relates to an active align apparatus comprising: a support unit which supports a camera module; a screen on which a correction pattern for optical axis correction of a second lens module is formed and which reflects second light corresponding to the incidence range of first light; a gripper unit which transmits the first light and second light and corrects the optical axis of the second lens module; and a control unit which, when a correction pattern image corresponding to the second light is input from the second lens module, controls the optical axis correction of the second lens module according to a location difference value obtained by comparing the correction pattern image with a set reference pattern image, wherein the gripper unit includes transparent glass which transmits the second light, and thus transmits the second light to the second lens module through the transparent glass.

The present invention relates to a hologram recording medium and an optical element comprising the same. The hologram recording medium not only has excellent optical recording properties but also can exhibit transparent optical properties and excellent reliability even in high temperature and high humidity environments.

The present invention relates to a hologram recording medium and an optical clement comprising the same. The hologram recording medium not only has excellent optical recording properties but also can exhibit transparent optical properties and excellent reliability even in high temperature and high humidity environments.

The invention relates to the technical field of ultrafast optical storage, in particular to an ultrafast optical storage material screening method based on pseudo slippage and a storage device. Screening out a material of which the spatial inversion symmetry is broken and the band gap is within a preset range as a driving layer material, and screening out a material of which the spatial inversion symmetry is not broken or the band gap is greater than the band gap of the driving layer material as a substrate material; performing lattice matching processing on the driving layer material and the substrate material to construct a heterojunction structure; performing optical excitation simulation on the heterojunction structure, and simulating a laser excitation process by introducing a time-varying electric field so as to verify whether the pseudo-slip effect of the heterojunction structure occurs or not; according to the method, optical property calculation is carried out on the heterojunction structure with the pseudo-slip effect, optical property differences before and after pseudo-slip are compared to determine optical parameters of data reading, and limitation of a material system is broken through while the power consumption problem is reduced.

The invention relates to a scanner system (10) for use in an apparatus (100) for producing a three-dimensional workpiece by applying electromagnetic radiation or particle radiation to a layer of a raw material powder, the scanner system (10) comprising a pivotable scanner mirror (12) having a first surface (14) configured to be impinged by an irradiation beam (116) emitted by a radiation source (114). Furthermore, the scanner system (10) includes a scanner mirror cooling device (22) having a first coolant supply device (26) configured to direct a first coolant flow (28) over the first surface (14) of the scanner mirror (12), and / or directing a first coolant flow onto a first surface of the scanner mirror.

An interferometric scattering microscope comprising: a solid immersion lens provided in a sample solution comprising an object, wherein an interaction between the object and the surface of the solid immersion lens arises; an illumination source; a detector; and an optical system arranged to direct illuminating light from the illumination source onto the surface of the solid immersion lens, collect output light from the surface of the solid immersion lens and to direct the output light to the detector, is provided.

The present disclosure provides a volume hologram laminate comprising a substrate, and a volume hologram laminate portion placed on one surface of the substrate, wherein the volume hologram laminate portion includes, from a substrate side, a resin layer including transparent resin; an inhibiting layer placed in a pattern form, in contact with the resin layer; and a volume hologram layer, on which an interference fringe is recorded, placed in contact with the resin layer and the inhibiting layer, in this order, and an inhibiting layer-formed region including the inhibiting layer and an inhibiting layer-non-formed region including no inhibiting layer differ in a color of a reproduction image from the volume hologram layer.

The present invention provides a data security one-way ferry system and method, which relates to the field of data transmission technology, including: a burning lifting assembly, a reading lifting assembly, an in-and-out bin assembly, an optical disc box assembly and a main bearing plate; the in-and-out bin assembly is used to store optical discs and drive the optical discs to move; the burning lifting assembly is used to accurately burn the optical discs; the reading lifting assembly is used to accurately read the optical discs; the optical disc box assembly is used to rotate the optical discs; the main bearing plate is used to carry the burning lifting group, the reading lifting assembly, the in-and-out bin assembly and the optical disc box assembly. The present invention can facilitate staff to transmit data from a low-density network to a high-density network under the condition of meeting network security requirements, and at the same time, perform one-way physically isolated data transmission in a dual-network environment without wasting physical effort and energy, thereby reducing errors caused by manual operation and ensuring data security.

The present invention relates to a hologram recording medium and an optical element comprising the same. The hologram recording medium not only has excellent optical recording properties but also can exhibit transparent optical properties and excellent reliability even in high temperature and high humidity environments.

The present disclosure relates to a hologram recording medium and an optical element comprising the same. The hologram recording medium not only has excellent optical recording properties but also can exhibit excellent reliability and high transparency even under high temperature conditions.

The present disclosure provides a method and system for high-speed information readout based on a fluorescence defect in a solid material, which can be applied in the technical field of optical information storage. The method comprises: determining a readout parameter set, wherein the readout parameter set is configured to perform parallel information reading on N points to be read which are comprised in a solid material, said points have fluorescence defects, and different fluorescence defects correspond to different pieces of information to be read; on the basis of the readout parameter set, exciting the fluorescence defect at each of said N points, and reading the number of photons at each of said N points to obtain at least one piece of fluorescence data, wherein the fluorescence data comprises the number of photons corresponding to each of M points to be read, the number of photons corresponds to the fluorescence defect of the corresponding point to be read, M and N are positive integers, and M is less than or equal to N; and on the basis of the at least one piece of fluorescence data and a preset mapping relationship, obtaining the information to be read stored at each of said N points.

A security tag 1 includes a plurality of colloidal particles 10 and a resin layer 20. The plurality of colloidal particles 10 are, when in a state of being embedded in the resin layer 20, arranged so as to be spaced apart from each other in a plane direction perpendicular to the thickness direction, and at least one type of two-dimensional crystal R1 composed of the plurality of colloidal particles 10 is present.

The present specification relates to an active alignment device comprising: a support unit supporting a camera module; a screen forming a correction pattern for optical axis correction of the second lens module and reflecting second light corresponding to an incident range of the first light; a clamping unit which transmits the first light and the second light and corrects the optical axis of the second lens module; and a control unit that, if a correction pattern image corresponding to the second light is input from the second lens module, controls optical axis correction of the second lens module according to a position difference between the correction pattern image and a set reference pattern image; the clamping unit uses a transparent glass that transmits the second light such that the second light is transmitted through the transparent glass and incident on the second lens module.

Provided are a magnetic disk substrate having a pair of front and back main surfaces, wherein each of the front and back main surfaces has a fixing site which is brought into contact with a fixing jig when the magnetic disk substrate made into a magnetic disk is incorporated into a hard disk drive, and the fixing sites on the front and back main surfaces have a root mean square deviation Rq of surface roughness of 0.01-0.44 μm, and a magnetic disk using the magnetic disk substrate.

The present application relates to a photopolymer composition, a holographic recording medium, a method for producing the same, and an optical element containing the same. The photopolymer composition can provide a holographic recording medium and an optical element containing the same that not only have excellent optical recording properties but also exhibit excellent reliability and transparency even in high-temperature environments.

The present specification relates to an active align apparatus comprising: a support unit which supports a camera module; a screen on which a correction pattern for optical axis correction of a second lens module is formed and which reflects second light corresponding to the incidence range of first light; a gripper unit which transmits the first light and second light and corrects the optical axis of the second lens module; and a control unit which, when a correction pattern image corresponding to the second light is input from the second lens module, controls the optical axis correction of the second lens module according to a location difference value obtained by comparing the correction pattern image with a set reference pattern image, wherein the gripper unit includes transparent glass which transmits the second light, and thus transmits the second light to the second lens module through the transparent glass.

A method for measuring a property of an object, the method comprising: dipping a solid immersion lens into a solution comprising the object, such that the object interacts with the surface of the solid immersion lens; illuminating the surface of the solid immersion lens with an illumination source and detecting the scattered light from the object using an interferometric scattering microscope; measuring a property of the object using the detected scattered light; withdrawing the solid immersion lens from the solution; and subsequently cleaning the solid immersion lens such that the object is removed from the surface of the solid immersion lens.

The invention relates to a scanner system (10) for use in an apparatus (100) for producing three-dimensional workpieces by applying electromagnetic radiation or particle radiation to raw material powder layers, the scanner system (10) comprising a pivotable scanner mirror (12) having a first surface (14) configured to be impinged upon by an irradiation beam (116) emitted by a radiation source (114). Furthermore, the scanner system (10) comprises a scanner mirror cooling device (22) having first coolant supply equipment (26) configured to conduct a first coolant flow (28) over and / or on the first surface (14) of the scanner mirror (12).

The present disclosure relates to a hologram recording medium and an optical element including the same. The hologram recording medium not only has excellent optical recording characteristics, but also can exhibit excellent reliability and high transparency even under high temperature conditions.

The present disclosure relates to a photopolymer composition, a hologram recording medium, a method of preparing the same, and an optical element including the same. The photopolymer composition can provide a hologram recording medium exhibiting not only excellent optical recording characteristics but also excellent reliability and transparency even at high temperatures, and an optical element including the same.

According to one embodiment, a magnetic recording device includes a magnetic recording medium, a plurality of magnetic heads for recording information on the magnetic recording medium, and a controller for controlling the magnetic heads. Each of the magnetic heads includes a coil, a first magnetic pole for generating a magnetic field according to a recording current supplied to the coil, and a light emitting section for irradiating the magnetic recording medium with light to locally increase a temperature of the magnetic recording medium. The controller performs a first operation, in which a lifetime information related to a remaining life time of one of the magnetic heads is calculated based on a first information related to a failure probability of a magnetic head group including the magnetic heads and a second information related to a remaining time based on a history of the one of the magnetic heads.

The present application discloses an optical storage medium, an optical storage medium tracking method, and an optical storage medium tracking device, relating to the field of optical storage technology. The optical storage medium includes multiple storage layers, each of which includes: a data area for storing data, and multiple guide areas for positioning the storage layer; wherein the guide areas of the multiple storage layers form at least two non-overlapping guide units in a direction perpendicular to the multiple storage layers, and each guide unit includes partial guide areas of at least two storage layers.

To provide a glass that can suppress the deformation of a glass substrate, is excellent in moldability, and has a low burden on manufacturing equipment.SOLUTION: Provided is an alkali-free glass in which thermal expansion coefficient, Young's modulus, strain point, temperature T4 at which viscosity is 104 dPa s, glass surface devitrification temperature, and temperature T2 at which viscosity is 102 dPa s are within specified range, and contained amount of SiO2, Al2O3, B2O3, MgO, CaO, SrO, and BaO, MgO+CaO+SrO+BaO, and MgO / CaO are within specified range.SELECTED DRAWING: None