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    • 1. 发明授权
    • Filter for CRT screen
    • 过滤CRT屏幕
    • US4755716A
    • 1988-07-05
    • US74037
    • 1987-07-16
    • Koji HayafuneHideo AmemiyaEiiti Sugihara
    • Koji HayafuneHideo AmemiyaEiiti Sugihara
    • H01J29/89
    • H01J29/898H01J29/896H01J2229/8633H01J2229/8922
    • A filter for a CRT screen according to the invention is constituted such that a compound sheet consisting of a conductive net and a transparent resin film is molded so as to be closely attached to the CRT screen, and also to avoid the occurrence of moire fringes, the mesh of the net is selected at a suitable value such that the ratio of the pitch of the scanning lines of the CRT and the pitch of the wires of the net does not fall near simple integers or the inverse numbers thereof. The filter can shut off the electromagnetic waves, electrostatic charge, ultraviolet rays, etc. which are generated from the CRT, without spoiling the resolution of the CRT and can substantially prevent adverse influences on the human body by the CRT. No moire fringes are produced on the screen. A hard coating treatment and a glare-proofing treatment are further performed, so that an illumination lamps or the like in the room are not reflected from the filter surface. Therefore, the operators can continue their work without fatigue of the eyes and without adverse mental influence based on such fatigue. Further, when the surface of the CRT filter is cleaned or even if a point of pencil or the like accidentally touches the filter surface, no scratching is caused on the surface.
    • 根据本发明的CRT屏的过滤器被构造成使得由导电网和透明树脂膜组成的复合片被模制以紧密地附接到CRT屏幕,并且还避免了莫尔条纹的发生, 以适当的值选择网的网格,使得CRT的扫描线的间距与网的线的间距的比率不会接近简单整数或其倒数。 该滤波器可以切断由CRT产生的电磁波,静电荷,紫外线等,而不会破坏CRT的分辨率,并且可以显着地防止CRT对人体的不利影响。 屏幕上没有产生莫尔条纹。 进一步进行硬涂层处理和防眩处理,使得室内的照明灯等不从过滤器表面反射。 因此,操作人员可以不疲劳的眼睛继续工作,也不会因此疲劳而产生不利的心理影响。 此外,当CRT过滤器的表面被清洁或者即使铅笔等点意外地接触过滤器表面时,也不会在表面上产生划伤。