Samsung Display Devices Co., Ltd.

Dong-hee Han

Seung-Kwon Han

Hwan-chul Rho

Sung-hwan Moon

Jae-Myung Kim

Jae-myung Kim

Jun-sik Oh

Yoon-hyoung Cho

Ki-su Han

A shadow mask for a cathode ray tube includes a surface hardening layer and a solid-solution and precipitation hardening layer formed under the surface hardening layer.

Shadow mask for cathode ray tube and method of manufacturing same

A shadow mask includes an aperture portion having a plurality of apertures formed therein, the aperture portion being formed over a predetermined area in a center of the shadow mask; and a non-aperture portion defining a periphery of the shadow mask and formed adjacent to the aperture portion. Only the aperture portion is selectively heat-treated to result in a tensile strength of the aperture portion being 1.2 to 3 times greater than that of the non-aperture portion, and the modulus of elasticity of the aperture portion being 1.5 to 3 times greater than that of the non-aperture portion. The method includes the steps of selectively performing a heat-treating process on only the aperture portion of the shadow mask by mounting a separating cover on the non-aperture portion, the separating cover preventing contact of the non-aperture portion with the gaseous atmosphere present during the heat treating process. The shadow mask is then press-formed.

Disclosed is a shadow mask for a cathode ray tube (CRT) and a method of manufacturing the same. The shadow mask includes a nitrogen compound. The method includes the steps of heat-treating a metallic plate having a plurality of apertures formed therein in the presence of a nitriding gas, and press-forming the metallic plate into a shadow mask shape.

A spring used in a CRT interconnects a stud pin embedded into a CRT panel and a mask frame mounting a shadow mask thereon so that the spring removably mounts the shadow mask within the CRT panel. In order to minimize or interrupt a vibration energy transmitted to the shadow mask, the spring is formed with a composite metal plate having a laminated structure of more than two materials capable of converting the vibration energy applied thereto into a thermal energy by an internal or interfacial friction. The composite metal plate is preferably composed of a first steel, a zinc alloy, and a second steel. A method of making the spring includes the steps of plating two or more metallic materials in sequence, rolling the plated metallic materials into an integrated composite metal plate, and forming the composite metal plate into a spring shape.

Laminated spring structure for CRT

Paste composition for screen printing of CRT shadow mask and screen

A color cathode ray tube in which the structure of a shadowmask frame assembly is improved. The color cathode ray tube includes a panel, a funnel sealingly coupled to the panel, an electron gun installed in a neck portion of the funnel, a deflection yoke installed around a conical portion of the funnel, a shadowmask frame assembly including a shadowmask in which a multiplicity of electron beam passing holes are formed and a frame installed at an inner edge of the panel for supporting the shadowmask, and a heater for thermally expanding the frame in the same direction as the thermal expansion direction of the shadowmask. According to the color cathode ray tube, it is possible to stabilize an initial screen.

Color cathode ray tube

Disclosed is a correction lens system of an exposure apparatus for a cathode-ray tube which comprises a lens formed with a plurality of block cells joined together and which diffuses and irradiates a light emitted from a light source to an inner surface of a panel, characterized in that the lens system is structured to interrupt ultraviolet rays having a wave length of less than 300 nm, and a method for manufacturing a correction lens of an exposure apparatus for a cathode-ray tube, for diffusing and irradiating a light emitted from a light source to an inner surface of a panel, wherein the method comprises the steps of treating a plurality block cells made of glass such that an upper part of each block cell is inclined at a predetermined angle, polishing the block cells, and adhering the block cells to each other to form a correction lens having a certain shape.

Correction lens system of an exposure apparatus for a cathode-ray tube

A shadow mask for color picture tubes made of AK steel has an Ni layer on its surface so that an Fe-Ni alloy layer is obtained in a hydrogen heating furnace to induce substance diffusion of both the Ni layer and the AK steel shadow mask. A method for making shadow mask for color picture tubes including the steps of making a main flat shadow mask body with AK steel, coating its surface with Ni, forming an Fe-Ni alloy layer on the main flat shadow mask, and pressing the main flat shadow mask body to form a certain shape.

Method for making shadow mask for color picture tube and a shadow mask

Disclosed is a method for making a shadow mask for a color picture tube, including the steps of: forming a pattern, corresponding to apertures of the shadow mask, on a screen mesh fixed to a frame; applying metal paste on the screen mesh having the pattern; disposing a flat AK steel shadow mask under the screen mesh; printing a metal layer on a face of the flat AK steel shadow mask by squeezing the metal paste on the screen mesh with a constant pressure along a direction; and pressing the flat shadow mask to form a skirt portion and a bead portion of the shadow mask.

Method for making a shadow mask for a color picture tube

A light exposing device for fixing a black matrix on the internal surface of a CRT's panel is disclosed. The device includes green, blue and red light exposing units arranged in a casing one after another. Each exposing unit has a light source, a shutter, a compensating lens and a filter. A chucking unit is placed at each side of the device for selectively chucking a plurality of panels seated on the exposing units. The chucking unit is operated by a driving unit so as to move the panels on the device by one pitch. Initial and final waiting sections are provided before the green light exposing unit and after the red light exposing unit, respectively. On the waiting sections, the panels before exposing and after exposing stand by ready to be fed to the green light exposing unit and to be fed to a following process, respectively.

Growing community of inventors

Kyungki-do, South Korea

Dong-hee Han