Abstract: A micro mirror and a method of manufacturing the same are provided. The micro mirror includes a silicon substrate having a first slant plane and a second slant plane that face each other, and a clad layer including a first mirror surface and a second mirror surface respectively formed on the first slant plane and the second slant plane, wherein the clad layer reflects light.

Abstract: An integrated optical head is provided. In the integrated optical head, a light source emits light. A waveguide guides the light. An input coupler is located at one edge of the waveguide, and couples light emitted from the light source and transmits the coupled light to the waveguide. An output coupler is located at another edge of the waveguide, and couples light emitted from the waveguide and focuses the coupled light on an optical disc. A light path changing unit is installed on the waveguide, and changes the light path of light that has been reflected by the optical disc and then passed through the output coupler. An optical detector receives the light passed through the light path changing unit and converts the received light into an electrical signal in order to detect information from the optical disc Accordingly, an input coupling efficiency and an output coupling efficiency are improved, such that light loss is reduced.

Abstract: Provided is an objective optical system employing a gradient index (GRIN) lens. A refractive index of the GRIN lens is changed in an axial direction and a direction perpendicular to the axial direction. The GRIN lens has a refractive index n satisfying the following equation: n ? ( r , z ) = ? i = 0 ? ? n r2i ? r 2 ? i + ? j = 0 ? ? n zj ? z j where z is a distance from the center of the lens in the axial direction and r is a distance from the center of the lens in the direction perpendicular to the axial direction. Thus, an objective optical system with a high numerical aperture can correct aberration.

Abstract: Provided is a method of exposing using an electron beam. The provided method of exposing using the electron beam includes defining main fields on an exposure area of an electron beam exposure target and defining a plurality of sub-fields on the main fields, selecting a main field to be exposed, selecting at least one sub-field of the selected main field, exposing the selected sub-field by using the electron beam, and selecting at least one of the other sub-field, which is not adjacent to the previously selected sub-field and not exposed yet, and exposing the sub-field by using the electron beam.

Abstract: An integrated optical head is provided. In the integrated optical head, a light source emits light. A waveguide guides the light. An input coupler is located at one edge of the waveguide, and couples light emitted from the light source and transmits the coupled light to the waveguide. An output coupler is located at another edge of the waveguide, and couples light emitted from the waveguide and focuses the coupled light on an optical disc. A light path changing unit is installed on the waveguide, and changes the light path of light that has been reflected by the optical disc and then passed through the output coupler. An optical detector receives the light passed through the light path changing unit and converts the received light into an electrical signal in order to detect information from the optical disc. Accordingly, an input coupling efficiency and an output coupling efficiency are improved, such that light loss is reduced.

Abstract: A hybrid lens unit and a hybrid lens array capable of correcting chromatic aberration and that can be manufactured easily are provided. The unit includes a lens holder, a refraction lens, and a diffraction lens part. The lens holder includes a beam passing cavity having a lens mounting groove on an upper portion of the beam passing cavity. The refraction lens has a plane portion mounted into the lens mounting groove and an aspherical portion inserted into the beam passing cavity. The diffraction lens part is coupled to a lower surface of the lens holder so as to face the aspherical portion. With such a construction, the unit can correct chromatic aberration generated from the refraction lens using the diffraction lens part and has a structure that makes mass-production possible.

Abstract: An objective lens system and an optical pickup apparatus using the same are provided. The objective lens system includes a diffractive optical element, and a half-ball lens disposed between the diffractive optical element and the medium, the half-ball lens having a spherical surface on a side facing the diffractive optical element, and an aspheric membrane formed on the spherical surface of the half-ball lens. The aspheric membrane comprises a plastic material or an ultraviolet-cured resin. The optical pickup apparatus includes a light source, an optical path converter disposed between the light source and an information storage medium, the above-described objective lens system disposed between the optical path converter and the information storage medium, and a photodetector which receives light reflected from the information storage medium and passed through the objective lens system and the optical path converter and which detects an information signal and an error signal.

Abstract: An optical bench, an integrated optical system, and an optical alignment method are provided. The integrated optical system includes a light source; a main photodetector which receives light that is emitted from the light source and reflected from a disc; an optical bench on which the light source and the main photodetector are installed; a lens unit installed on the optical bench; and an optical path separator which separates a path of light from the light source to the lens unit and a path of light from the lens unit. The optical bench includes a landing recess which is open upward toward the disc and which has an aperture on a bottom thereof to pass light. The optical path separator is mounted within the landing recess.

Abstract: A micromirror array and a method of manufacturing the same are provided. The method of manufacturing the micromirror array used in controlling a light path of an optical element includes: forming at least one alignment pattern in which a micromirror is to be seated on a substrate; and seating the micromirror having at least one reflective surface in the alignment pattern.

Abstract: An optical pickup apparatus and a method of combining a submount and an optical bench of the optical pickup apparatus are provided. The optical pickup apparatus includes an optical bench, a submount installed on the optical bench, a light source mounted on the submount, a lens unit joined to the optical bench, and an optical path separator which separates light that is emitted from the light source and then proceeds to the lens unit from light that is incident from the lens unit, wherein the submount is soldered to the optical bench.

Abstract: A planar lens capable of compensating for chromatic aberration and which is easy to manufacture and enables easy assembling of optical pickups and a method for fabricating the planar lens are provided. The planar lens includes a transparent substrate with a lens cavity in a surface of the transparent substrate, and a lens element formed in the lens cavity with a first refracting surface in contact with the bottom of the lens cavity and a second diffracting surface having a diffraction grating opposite to the first refracting surface.

Abstract: A micro mirror and a method of manufacturing the same are provided. The micro mirror includes a silicon substrate having a first slant plane and a second slant plane that face each other, and a clad layer including a first mirror surface and a second mirror surface respectively formed on the first slant plane and the second slant plane, wherein the clad layer reflects light.

Abstract: A hard disk drive having a vibration reducing damper is disclosed. The hard disk drive is provided with a damper which is interposed between a through hole provided at a cover plate and a screw joined to the upper end of the shaft of a spindle motor, and includes at least one viscoelastic material layer. It is preferable that the damper has a multi-layered structure in which at least one high stiffness layer has relatively higher stiffness and at least one low stiffness layer made of a viscoelastic material has relatively lower stiffness. With the above configuration, the damper restrains vibrations generated by the spindle from being transferred to the cover plate, noises generated by the hard disk drive are reduced, and, in addition, since vibrations generated by the spindle motor are damped, disk fluttering is reduced.

Abstract: A hard disk drive having a vibration reducing damper is disclosed. The hard disk drive is provided with a damper which is interposed between a through hole provided at a cover plate and a screw joined to the upper end of the shaft of a spindle motor, and includes at least one viscoelastic material layer. It is preferable that the damper has a multi-layered structure in which at least one high stiffness layer has relatively higher stiffness and at least one low stiffness layer made of a viscoelastic material has relatively lower stiffness. With the above configuration, the damper restrains vibrations generated by the spindle from being transferred to the cover plate, noises generated by the hard disk drive are reduced, and, in addition, since vibrations generated by the spindle motor are damped, disk fluttering is reduced.

Abstract: An optical system including a light source that generates light, a mirror changing an optical path of the light generated by the light source and an aberration correcting element that corrects aberrations generated in the light reflected from the mirror due to an error in the surface shape of the mirror.

Abstract: A planar lens capable of compensating for chromatic aberration and which is easy to manufacture and enables easy assembling of optical pickups and a method for fabricating the planar lens are provided. The planar lens includes a transparent substrate with a lens cavity in a surface of the transparent substrate, and a lens element formed in the lens cavity with a first refracting surface in contact with the bottom of the lens cavity and a second diffracting surface having a diffraction grating opposite to the first refracting surface.

Abstract: A method of manufacturing a micro-lens in which at least one first lens is first molded using a compression technique. A lens holder is produced including a hole in which the first lens is seated. A second lens is formed on a bottom surface of the lens holder. The first and second lenses are combined by aligning the first and second lenses along an optical axis in the hole of the lens holder. Thus, a hybrid micro-lens composed of a diffractive lens and a refractive lens, along with an array of the hybrid micro-lenses are easily manufactured.

Abstract: An optical system and an information apparatus using the optical system are provided. The optical system includes an optical bench on which a light source and a photodetector including a main photodetector receiving the light are mounted. A lens unit is coupled to the optical bench, and an optical path separating member separates an optical path of light emitted from the light source and propagating toward the lens unit and an optical path of light incident from the lens unit. The optical system may include a monitor photodetector and/or an optical path forming unit coupled to the optical bench. The monitor photodetector receives a portion of the light emitted from the light source. The optical path forming unit includes a first mirror reflecting the light emitted from the light source and a second mirror reflecting the light incident from the lens unit and reflected by the first mirror.

Abstract: A cover plate for an optical disk drive designed to reduce disk vibrations and noise is provided. The cover plate is installed above a main frame of the optical disk drive and has a through hole in the center through which a disk clamp for clamping a disk placed on a turntable is fitted and a projection formed to oppose the disk up to a predetermined height in order to narrow a gap with the disk. Furthermore, the cover plate has a circular step formed opposite a surface corresponding to an outer circumference of the disk in the shape of an annular groove for lowering acoustic energy density of noise. The cover plate constructed in this way reduces disk vibration due to air damping effects resulting from a narrow gap between the disk and the cover plate while suppressing noise due to the presence of the abruptly expanded portion. Furthermore, the cover plate can be implemented without a separate device by making simple changes to the structure of cover plate.

Abstract: A hybrid lens with a high numerical aperture is described. The hybrid lens comprises a refractive surface that refracts incident light and a diffractive surface that diffracts light exiting the lens, the diffracting surface designed by a sag satisfying the following Equation: s ? ? ? a ? ? ? g = f D + m ? ? ? ? - f D ? ? 2 + r ? ? 2 n - 1 , wherein fD is a distance from a center peak to a focal point of the hybrid lens, r is a height from a center axis to each peak of the hybrid lens, n is the refractive index of the hybrid lens, ? is the wavelength of incident light and m is an integer. The hybrid lens is small and lightweight and capable of removing chromatic aberration.