PIN-HOLE PLATE Russian patent published in 2007 - IPC C03C3/102 C03C3/89 C03B37/25 

FIELD: optical and electronic industries; production of special optical glass for manufacture of pin-hole amplifiers-pin-hole plates.

SUBSTANCE: provision is made for enhancing chemical stability of active envelope glass and reducing crystallization ability of active envelope glass and soluble core, as well as increase of softening temperature and enhanced alignment of glass by viscosity and thermal expansion. Pin-hole plate is made from glass fibers containing active envelope made from glass of the following composition: SiO₂, PbO, Bi₂O₃, Sb₂O₃, As₂O₃, at least one oxide from group TiO₂, ZrO₂, Nb₂O₅, WO₃ ZnO, SrO and at least one oxide from group Al₂O₃, B₂O₃, K₂O, Rb₂O Cs₂O at the following composition of components, mass-%: SiO₂,49-70; PbO, 10-27; B₂O₃, 0.5-4; Al₂O₃,0.56-8; MgO, CaO, SrO, BaO, 1-13; ZnO, 1-11; TiO₂, 1-8; ZrO₂, 0.5-5; Nb₂O₅, WO₃, 0.5-3; K₂O,1-11; Rb₂O, 0.4-3; Cs₂O, 0.4-2; Bi₂O₃, 0.1-2; As₂O₃, 0.1-0.6; Sb₂O₃, 0.05-0,6; pin-hole plate contains also soluble core made from glass of the following composition, mass-%: SiO₂, 6-51; B₂O₃, 15-74; at least one oxide of group Al₂O₃, La₂O₃, 0.5-7; at least one oxide of group As₂O₃, SB₂O₃, 0.1-0.6, as well as at least one oxide of group BaO, SrO, CaO, MgO, ZnO at the following content: BaO, 0.5-32; SrO, 1-22; CaO, 1-16; MgO, 1-12; ZnO, 0.5-16.

EFFECT: improved service characteristics and protracted service life of pin-hole plate.

3 cl, 2 tbl