Abstract: Disclosed is a residual stress measuring system for measuring the residual stress in an optical fiber. The residual stress measuring system comprises a light source for generating light used to measure the residual stress, a lens system for converting the generated light into a plane wave, a polarimeter for transforming the converted light to an input polarized light, which is incident on the optical fiber, a rotational measuring section for rotating the optical fiber so as to enable the polarized light to transmit through the optical fiber in various directions, and a detector for detecting the residual stress from a phase shift of the transmitted light.

Abstract: A silicidation blocking layer (SBL) pattern is formed on a substrate including an active region and a field region. The SBL pattern covers the field region and exposes the active region. A silicide layer is formed on the active region by reacting metal with silicon existing in the active region. An insulation layer is formed on the substrate including the silicide layer. An opening exposing the silicide layer is formed by selectively etching the insulation layer under a condition having an etching selectivity between the SBL and the insulation layer. Conductive material is filled up the opening. The field region of a substrate is sufficiently protected by the SBL pattern without any additional process so that the failure of a semiconductor device is effectively prevented because the flow of a leakage current through the field region is blocked.

Abstract: An apparatus for measuring residual stress in an optical fiber is disclosed. The apparatus includes a light source for emitting a beam for use in measuring residual stress in an optical fiber, a polarimeter for polarizing the beam and converging the polarized beam to the optical fiber and a slide glass for supporting the optical fiber subject to measurement of its residual stress. The apparatus also includes an analyzer arranged in a position opposite to the slide glass for covering and supporting the optical fiber and for selectively passing a predetermined polarization component of the beam incident from the optical fiber and a detecting unit for visualizing the beam transmitted from the analyzer.

Abstract: A monolithic ink-jet printhead, and a method for manufacturing the same, wherein the monolithic ink-jet printhead includes a manifold for supplying ink, an ink chamber having a hemispheric shape, and an ink channel formed monolithically on a substrate; a silicon oxide layer, in which a nozzle for ejecting ink is centrally formed in the ink chamber, is deposited on the substrate; a heater having a ring shape is formed on the silicon oxide layer to surround the nozzle; a MOS integrated circuit is mounted on the substrate to drive the heater and includes a MOSFET and electrodes connected to the heater. The silicon oxide layer, the heater, and the MOS integrated circuit are formed monolithically on the substrate. Additionally, a DLC coating layer having a high hydrophobic property and high durability is formed on an external surface of the printhead.

Abstract: Disclosed is a residual stress measuring system for measuring the residual stress in an optical fiber. The residual stress measuring system comprises a light source for generating light used to measure the residual stress, a lens system for converting the generated light into a plane wave, a polarimeter for transforming the converted light to an input polarized light, which is incident on the optical fiber, a rotational measuring section for rotating the optical fiber so as to enable the polarized light to transmit through the optical fiber in various directions, and a detector for detecting the residual stress from a phase shift of the transmitted light.

Abstract: This invention relates to an alignment apparatus for aligning a planar optical wave-guide element and an optical fiber block wherein alignment can be completed with more precision and less expense than conventional methods. The alignment apparatus comprising a lower plate; a sliding table mounted on the lower plate capable of horizontal displacement on the lower plate; an upper plate mounted to the sliding table; and, a jig disposed on the upper plate and fixed to rotational means and capable of rotation about the upper plate for holding the optical fiber block.

Abstract: A monolithic ink-jet printhead, and a method for manufacturing the same, wherein the monolithic ink-jet printhead includes a manifold for supplying ink, an ink chamber having a hemispheric shape, and an ink channel formed monolithically on a substrate; a silicon oxide layer, in which a nozzle for ejecting ink is centrally formed in the ink chamber, is deposited on the substrate; a heater having a ring shape is formed on the silicon oxide layer to surround the nozzle; a MOS integrated circuit is mounted on the substrate to drive the heater and includes a MOSFET and electrodes connected to the heater. The silicon oxide layer, the heater, and the MOS integrated circuit are formed monolithically on the substrate. Additionally, a DLC coating layer having a high hydrophobic property and high durability is formed on an external surface of the printhead.

Abstract: A method for manufacturing an ink-jet printhead having a hemispherical ink chamber, wherein a nozzle plate is formed on a surface of substrate; a heater is formed on the nozzle plate; a manifold for supplying ink; an electrode is formed on the nozzle plate to be electrically connected to the heater; a nozzle is formed by etching the nozzle plate inside the heater; a groove for forming an ink channel is formed to expose the substrate so that the groove extends from the outside of the heater toward the manifold; an ink chamber is formed to have a diameter greater than the diameter of the heater and be hemispherical by etching the substrate exposed by the nozzle; an ink channel is formed to be in flow communication with the ink chamber and the manifold; and the groove is closed by forming a material layer on the nozzle plate.

Abstract: A bubble-jet type ink-jet printhead and manufacturing method thereof including a substrate integrally having an ink supply manifold, an ink chamber, and an ink channel; a nozzle plate having a nozzle on the substrate; a heater centered around the nozzle and an electrode for applying current to the heater on the nozzle plate; and an adiabatic layer on the heater for preventing heat generated by the heater from being conducted upward from the heater. Alternatively, a bubble-jet type ink-jet printhead may be formed on a silicon-on-insulator (SOI) wafer having a first substrate, an oxide layer, and a second substrate stacked thereon and include an adiabatic barrier on the second substrate. In the bubble-jet type ink-jet printhead and manufacturing method thereof, the adiabatic layer or the adiabatic barrier is provided to transmit most of the heat generated by the heater to ink under the heater, thereby increasing energy efficiency.

Abstract: An ink-jet printhead having a hemispherical ink chamber and a method for manufacturing the same, wherein the ink-jet printhead includes a substrate, in which a manifold for supplying ink, an ink chamber having a substantially hemispherical shape, and an ink channel for supplying ink from the manifold to the ink chamber are integrally formed; a nozzle plate having a multi-layered structure, in which a first insulating layer, a thermally conductive layer formed of a thermally conductive material, and a second insulating layer are sequentially stacked, and having a nozzle, formed at a location corresponding to the center of the ink chamber; a nozzle guide having a multi-layered structure and extending from the edge of the nozzle to the inside of the ink chamber; a heater formed on the nozzle plate to surround the nozzle, and an electrode formed on the nozzle plate to be electrically connected to the heater.

Abstract: A bubble-jet type ink-jet printhead and manufacturing method thereof including a substrate integrally having an ink supply manifold, an ink chamber, and an ink channel; a nozzle plate having a nozzle on the substrate; a heater centered around the nozzle and an electrode for applying current to the heater on the nozzle plate; and an adiabatic layer on the heater for preventing heat generated by the heater from being conducted upward from the heater. Alternatively, a bubble-jet type ink-jet printhead may be formed on a silicon-on-insulator (SOI) wafer having a first substrate, an oxide layer, and a second substrate stacked thereon and include an adiabatic barrier on the second substrate. In the bubble-jet type ink-jet printhead and manufacturing method thereof, the adiabatic layer or the adiabatic barrier is provided to transmit most of the heat generated by the heater to ink under the heater, thereby increasing energy efficiency.

Abstract: A monolithic ink-jet printhead, and a method for manufacturing the same, wherein the monolithic ink-jet printhead includes a manifold for supplying ink, an ink chamber having a hemispheric shape, and an ink channel formed monolithically on a substrate; a silicon oxide layer, in which a nozzle for ejecting ink is centrally formed in the ink chamber, is deposited on the substrate; a heater having a ring shape is formed on the silicon oxide layer to surround the nozzle; a MOS integrated circuit is mounted on the substrate to drive the heater and includes a MOSFET and electrodes connected to the heater. The silicon oxide layer, the heater, and the MOS integrated circuit are formed monolithically on the substrate. Additionally, a DLC coating layer having a high hydrophobic property and high durability is formed on an external surface of the printhead.

Abstract: An ink-jet printhead having a hemispherical ink chamber and a method for manufacturing the same, wherein the ink-jet printhead includes a substrate, in which a manifold for supplying ink, an ink chamber having a substantially hemispherical shape, and an ink channel for supplying ink from the manifold to the ink chamber are integrally formed; a nozzle plate having a multi-layered structure, in which a first insulating layer, a thermally conductive layer formed of a thermally conductive material, and a second insulating layer are sequentially stacked, and having a nozzle, formed at a location corresponding to the center of the ink chamber; a nozzle guide having a multi-layered structure and extending from the edge of the nozzle to the inside of the ink chamber; a heater formed on the nozzle plate to surround the nozzle, and an electrode formed on the nozzle plate to be electrically connected to the heater.

Abstract: An inkjet printhead includes a nozzle plate having a nozzle, a substrate having an ink feed hole, and an intermediate layer interposed between the nozzle plate and the substrate, wherein the intermediate layer includes an ink chamber connected to the ink feed hole and the nozzle and a heating element surrounding the ink chamber. In the present invention, the nozzle, the ink chamber, and the ink feed hole are formed in a straight channel, thereby providing a high density printhead.

Abstract: An ink-jet printhead having a hemispherical ink chamber and a method for manufacturing the same, wherein the ink-jet printhead includes a substrate, in which a manifold for supplying ink, an ink chamber having a substantially hemispherical shape, and an ink channel for supplying ink from the manifold to the ink chamber are integrally formed; a nozzle plate having a multi-layered structure, in which a first insulating layer, a thermally conductive layer formed of a thermally conductive material, and a second insulating layer are sequentially stacked, and having a nozzle, formed at a location corresponding to the center of the ink chamber; a nozzle guide having a multi-layered structure and extending from the edge of the nozzle to the inside of the ink chamber; a heater formed on the nozzle plate to surround the nozzle, and an electrode formed on the nozzle plate to be electrically connected to the heater.

Abstract: A method for manufacturing an ink-jet printhead having a hemispherical ink chamber, wherein a nozzle plate is formed on a surface of substrate; a heater is formed on the nozzle plate; a manifold for supplying ink; an electrode is formed on the nozzle plate to be electrically connected to the heater; a nozzle is formed by etching the nozzle plate inside the heater; a groove for forming an ink channel is formed to expose the substrate so that the groove extends from the outside of the heater toward the manifold; an ink chamber is formed to have a diameter greater than the diameter of the heater and be hemispherical by etching the substrate exposed by the nozzle; an ink channel is formed to be in flow communication with the ink chamber and the manifold; and the groove is closed by forming a material layer on the nozzle plate.

Abstract: An inkjet printhead having a hemispherical ink chamber and a method for manufacturing the same, wherein the ink-jet printhead includes a substrate, in which a manifold for supplying ink, an ink chamber having a substantially hemispherical shape, and an ink channel for supplying ink from the manifold to the ink chamber are integrally formed; a nozzle plate having a multi-layered structure, in which a first insulating layer, a thermally conductive layer formed of a thermally conductive material, and a second insulating layer are sequentially stacked, and having a nozzle, formed at a location corresponding to the center of the ink chamber; a nozzle guide having a multi-layered structure and extending from the edge of the nozzle to the inside of the ink chamber; a heater formed on the nozzle plate to surround the nozzle, and an electrode formed on the nozzle plate to be electrically connected to the heater.

Abstract: A bubble-jet type ink-jet printhead and manufacturing method thereof including a substrate integrally having an ink supply manifold, an ink chamber, and an ink channel; a nozzle plate having a nozzle on the substrate; a heater centered around the nozzle and an electrode for applying current to the heater on the nozzle plate; and an adiabatic layer on the heater for preventing heat generated by the heater from being conducted upward from the heater. Alternatively, a bubble-jet type ink-jet printhead may be formed on a silicon-on-insulator (SOI) wafer having a first substrate, an oxide layer, and a second substrate stacked thereon and include an adiabatic barrier on the second substrate. In the bubble-jet type ink-jet printhead and manufacturing method thereof, the adiabatic layer or the adiabatic barrier is provided to transmit most of the heat generated by the heater to ink under the heater, thereby increasing energy efficiency.

Abstract: An ink-jet printhead includes a nozzle plate having a nozzle, a substrate having an ink feed hole, and an intermediate layer interposed between the nozzle plate and the substrate, wherein the intermediate layer includes an ink chamber connected to the ink feed hole and the nozzle and a heating element surrounding the ink chamber. In the present invention, the nozzle, the ink chamber, and the ink feed hole are formed in a straight channel, thereby providing a high density printhead.

Abstract: A gate electrode structure of a semiconductor device and a manufacturing method thereof are provided. The gate electrode structure includes a first silicon layer pattern formed of a polycrystalline silicon layer and a second silicon layer pattern having surface roughness lower than that of the first silicon layer pattern formed on the first silicon layer pattern.