Glass for use in ultrasonic delay lines

Wave transmission lines and networks – Coupling networks – With impedance matching

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106 53, H03H 730, C03C 310, C03C 304

Patent

active

041237315

ABSTRACT:
A glass suitable for use in ultrasonic delay lines which comprises the components by weight, SiO.sub.2 42 to 27%, PbO 71 to 52% and preferably contains K.sub.2 O and/or Na.sub.2 O. The glass further contains PbF.sub.2, BaF.sub.2, KHF.sub.2, K.sub.2 SiF.sub.6, Na.sub.2 SiF.sub.6, ZnO, CdO, BaO, SrO, ZrO.sub.2, TiO.sub.2, La.sub.2 O.sub.3, Al.sub.2 O.sub.3, B.sub.2 O.sub.3, Sb.sub.2 O.sub.3 and As.sub.2 O.sub.3.
This invention is characterized by a low rate of shear wave propagation (V) in the glass. The delay line can be used for a dropout compensator circuit of Video Tape Recorder or Video Disk Players.

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patent: 4029897 (1977-06-01), Mayer

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