Chunghwa Picture Tubes, Ltd.

Beijing Vacuum Electonics Research Institute

Shunlu Xiao

Hsing-Yao Chen

Xinghui Li

Haijun Chen

Zhongzheng Liu

Ting Du

Disclosed are a mold assembly for making alkali metal wax packets, a method for preparing same, and a method for using same. The mold assembly comprises a silicon substrate (), the silicon substrate () comprising a mold isolator () at the edge of the silicon substrate () and a silicon substrate central portion (). The upper surface of the silicon substrate central portion () is indented to form a plurality of wax packet receiving cavities (). A cavity isolator () locates between adjacent wax packet receiving cavities (). A release sacrificial layer () is formed on the upper surface of the silicon substrate (), and a paraffin layer () is formed on the upper surface of the release sacrificial layer () away from the silicon substrate (). Cavities () for containing alkali metal are formed on a side of the paraffin layer () away from the release sacrificial layer (). The mold isolator () is provided with corrosion release holes (). The mold assembly can reliably and controllably achieve batch production of uniform alkali metal wax packet arrays and is completely compatible with MEMS and microelectronic processes, with simple processes that can be easily implemented and high operability. The wax packet mold assembly can be reused, such that wasting of raw materials can be avoided, and the cost of batch production can be effectively reduced.

Mold for making alkali metal wax packet, method for preparing same, and method for using same

An electron gun for use in a cathode ray tube (CRT) includes a source of energetic electrons, i.e., a cathode, a beam forming region for forming the energetic electrons into a narrow beam, an arrangement for deflecting the beam over a display screen, and a focus arrangement for focusing the beam on the display screen in the form of a small spot in forming a video image. The beam forming region includes a G control grid, a G screen grid and a portion of a G grid in facing relation to the G grid, where each grid includes a respective aperture through which the electron beam is directed, with the apertures aligned along a common axis. The size of the aperture on the side of the G grid in facing relation to the G grid forms a first focusing lens and is smaller than the size of the aperture on the opposed side of the G grid in facing relation to the G grid which forms a second focusing lens. The larger size of the G aperture in facing relation to the G grid reduces electron beam convergence and spherical aberration of a video image formed by the beam on the display screen. The aperture of the G grid may increase in diameter in proceeding from the low side, i.e., the G control grid facing side, to the high side, i.e., the G grid facing side, in a step-wise manner or in the general shape of a cone. The invention is adapted for use in a single beam projection CRT as well as in a multi-beam color CRT.

Beam forming region for electron gun

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Beijing, China

Shunlu Xiao