Abstract: The apparatus for transmitting and receiving sound is disclosed, wherein a directional microphone for detecting sound for transmission is applied and a sound output unit for outputting the received sound is arranged at a side of the directional microphone where sensitivity is low, thereby preventing sound coupling for received sound and sound for transmission without recourse to complicated signal processing to attenuate the echo and howling.

Abstract: An optical device and an LED package using the same, and a backlight apparatus are provided, the optical device including a substrate, a first transparent thin film layer formed at one surface of the substrate, a quantum dot layer formed at an upper surface of the first transparent thin film layer and made of quantum dot particles, a protective layer formed on at least one of an upper surface or a bottom surface of the quantum dot layer and formed with metallic oxide nano particles, and a barrier member formed on the upper surface of the first transparent thin film layer for establishing an area formed with the quantum dot layer and the protective layer.

Abstract: Disclosed herein are a microlens array sheet having a black matrix and a method for manufacturing the same. The manufacturing method includes a) the step of defining the regions of light apertures, through which condensed light passes, in a negative-type light-sensitive resin layer by radiating and condensing parallel light after sequentially laying a microlens array layer, a transparent support substrate or film layer and the negative-type light-sensitive resin layer one on top of another, and b) eliminating portions other than the regions of the light apertures formed in the light-sensitive resin layer, and forming a black matrix layer in regions where the portions have been eliminated.

Abstract: A scanning device includes a mirror unit formed on a substrate so as to be pivotable centering around one axis for adjusting the direction of reflected light; a support frame formed at one surface of the mirror unit for preventing dynamic deflection of the mirror unit and supporting the mirror unit; and a driving unit provided on the substrate and driving the mirror unit. Thus, a dynamic deflection phenomenon does not occur when the mirror unit is pivoted centering around the pivoting axis. Accordingly, stable operation is possible and the angle of rotation of the mirror unit can be accurately adjusted, so that the scanning device can be effectively used in a high-speed precision scanning system.

Abstract: Disclosed herein is a raster scanning display system. The raster scanning display system includes a micro mirror and a galvanic mirror. The micro mirror rotates in two horizontal directions and forms a horizontal beam by reflecting input light. The galvanic mirror rotates in two vertical directions and forms a two-dimensional scan region by reflecting the horizontal beam.

Abstract: Disclosed are an optical sheet for a plasma display panel, a method for manufacturing the same and a plasma display panel employing the same. More particularly, provided are an optical sheet for a plasma display panel to improve a contrast ratio and a method for manufacturing the same. The optical sheet for a plasma display panel comprises a transparent substrate, a plurality of light-transmitting structures arranged on the transparent substrate, a reflective film arranged on the side of each of the light-transmitting structures, a black matrix arranged on the reflective film, and a cover part arranged on the black matrix.

Abstract: A backlight unit including a substrate disposed thereon with conductive lines, a plurality of light emitting diodes each bonded to an upper surface of the substrate and spaced a predetermined distance apart from the substrate, and electrically connected to the conductive lines of the substrate; a transparent resin encompassing the plurality of light emitting diodes and formed on the upper surface of the substrate, and an optical transmission arrangement disposed on an upper surface of the transparent resin. Further, the arrangement includes a first layer for preventing light emitted from the light emitting diodes from being totally reflected by allowing an incident angle of the light to be less than a threshold angle, and a second layer for diffusing and emitting the light.

Abstract: The apparatus for transmitting and receiving sound is disclosed, wherein a directional microphone for detecting sound for transmission is applied and a sound output unit for outputting the received sound is arranged at a side of the directional microphone where sensitivity is low, thereby preventing sound coupling for received sound and sound for transmission without recourse to complicated signal processing to attenuate the echo and howling.

Abstract: A lens driving device includes a substrate which generates surface acoustic waves on its surface and a movable unit which is coupled to an optical lens and executes translation above the substrate using the surface acoustic waves. The lens driving device can implement translation of the lens without a separate mechanism, unlike the conventional driving devices using motors and screws, thereby satisfying the recent trend towards miniaturization and lightness to be used in a variety of industrial fields that use optical lenses.

Abstract: An electromagnetic scanning micro-mirror is provided with a magnetic field generator for supplying a magnetic field, a mirror plate having a reflective plane and a frame structure attached to a rear surface of the reflective plane, a substrate to surround the mirror plate, a pair of torsion bars to connect the mirror plate to the substrate, and a magnetic substance provided at the rear surface of the reflective plane of the mirror plate and adapted to generate a drive force by interacting with the magnetic field supplied from the magnetic field generator, wherein the mirror plate performs a rotation operation about the torsion bars, which define the rotating axis of the mirror plate, by use of the drive force generated from the magnetic substance.

Abstract: In an optical pickup head of an optical recording reproducing apparatus, a fabrication method thereof, a lubricant-coated optical pickup head of an optical recording reproducing apparatus and a method for coating lubricant onto an optical pickup head, by using a MEMS (micro electro mechanical system) technique used for designing, fabricating and application of a microstructure, it is possible to miniaturize an optical pickup head of an optical recording reproducing apparatus and reduce a fabrication cost thereof.

Abstract: A microlens array sheet and a manufacturing method thereof. The microlens array sheet comprises: a transparent substrate; bases formed on the transparent substrate, the bases having the same height as a result of a planarization process conducted for the upper portions of the bases, microlenses formed on the bases; and a gap-filling film applied on the resulting structure, in which the bases have the same height. The method comprises the steps of: depositing base-forming molds on a transparent support substrate or film and loading a material to be used as bases between the base-forming molds; polishing the upper portion of the material for use as bases so as to form bases having the same level, and removing the base-forming molds; depositing microlenses on the formed bases; and depositing a gap-filling film on the resulting structure.

Abstract: A micro-actuator, its manufacturing method, an optical pickup head of an optical recording/reproducing apparatus having the micro-actuator, and its manufacturing method are disclosed. A low voltage and low power bi-directional driving is accomplished so that a size and a weight of a system can be considerably reduced and a response speed can be improved. A uniformity and a production efficiency are heightened by reducing a alignment tolerance. In addition, a configuration tolerance caused due to an uneven thickness of a protection layer of the record layer on the disk and an uneven smoothness of the disk is corrected, so that a focal point of an objective lens can be optimally made on a record layer of the disk.

Abstract: Disclosed is a microlens array sheet capable of improving a viewing angle by maintaining a fill factor while reducing a radius of curvature of the microlens of the microlens array sheet. To this end, the microlens array sheet includes: a substrate; a lens arranged on the substrate; and a gap filling layer formed at exposed surfaces of the substrate and the lens, wherein the lens is arranged as high as or at a higher position than a height of the gap filling layer formed at a gap between lenses arranged on the substrate.

Abstract: The present invention discloses a microlens array sheet of a projection screen including a lens sheet having a predetermined area, microlenses arranged on one surface of the lens sheet in the horizontal and vertical directions, a black matrix including apertures corresponding to the microlenses, and being adhered to the other surface of the lens sheet, an optical diffusing layer formed on the lens sheet to cover the black matrix, for widening a viewing angle, and a protecting film for protecting the optical diffusing layer. The microlens array sheet of the projection screen is manufactured by using a process for manufacturing a semiconductor device, a reflow process and a plating process for a mold, thereby improving luminance and definition of the projection screen at a low unit cost of production.

Abstract: An aspherical microlens arrays comprise a base, and a plurality of aspherical microlens arranged on the base and having different curvature radiuse and conic coefficient respectively, along two orthogonal axes on the base perpendicular to an optical axis, by which a degree of refraction, namely, a numerical aperture can be easily adjusted depending on each axial direction, a spherical aberration can be reduced, and concentration efficiency can be improved. In addition, in case of applying the aspherical microlens arrays to a projection screen, an image sensor, or the like, it is advantageous to improve sensitivity and resolution thereof.

Abstract: An optical fiber coupling system is provided which minimizes beam loss. The system includes a substrate with a laser beam emitting unit attached at one end, a first fine lens which focuses or collimates a vertical beam emitted by the laser beam emitting unit, a set of second fine lenses which focus or collimate a horizontal beam emitted by the laser beam emitting unit, and a beam output unit which outputs the beam focused or collimated by the first and second fine lenses. This arrangement reduces an alignment error associated with this type of optical system and improves a degree of beam focus. Additionally, the optical fiber coupling system can be made compact and available for mass-production.

Abstract: Disclosed is a device for reducing deterioration of image quality which can get rid of speckle by equalizing a laser from a light source on a screen by vibrating a reflective mirror installed between the light source and the screen at a predetermined amplitude. The device for reducing deterioration of image quality in a display system using a laser as a light source includes: a reflective mirror formed at the path of light positioned between the light source and a screen, for reflecting the laser; and a driving unit connected to the reflective mirror and vibrating the reflective mirror at a predetermined amplitude by using an electromagnetic force.

Abstract: Disclosed are an optical recording reproducing apparatus which can effectively remove contamination material attached thereto and an optical recording medium used in the optical recording reproducing apparatus. To this end, the apparatus comprises: a catalyst layer formed at a specific part thereof; and a light irradiation unit for irradiating light on the catalyst layer. An optical disc used in an optical recording reproducing apparatus includes a catalyst layer.

Abstract: A flow control valve apparatus, a manufacturing method thereof and a heat exchanger using the same. The flow control valve apparatus includes: a flow channel having a longitudinal axis comprised of an upper flow channel and a lower flow channel, for guiding a fluid; sealing means installed in a plane perpendicular to the flow channel and having an orifice through which the fluid passes; opening/closing means for controlling opening/closing of the orifice; and applying means installed along an outer circumference of the flow channel and to which a current may be applied for controlling the opening/closing of the orifice. According to the inventive flow control valve apparatus, the displacement of the permanent magnet valve member is varied using the current applied to the solenoid coil, thereby linearly controlling the opened area of the orifice and/or performing the opening/closing operation of the orifice. The valve apparatus can be miniaturized at a low price.