Glass for use in ultrasonic delay lines
AssigneeAsahi Glass Company, Limited
InventorsTohru Kanbara, Michihiko Uemura, Nobuhiro Yokoo
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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.
Claims12
In a solid ultrasonic delay line comprising an input transducer, a delay medium, and an output transducer, the improvement wherein said delay medium is a glass characterized by a rate of shear wave propagation not exceeding 2.40Km/sec., and which consists essentially of:
- ______________________________________ Weight percent ______________________________________ SiO.sub.2 42-27 PbO 71-52 PbF.sub.2 10-0 BaF.sub.2 10-0 KHF.sub.2 9-0 K.sub.2 SiF.sub.6 7-0 Na.sub.2 SiF.sub.6 5-0 K.sub.2 O 12-0 Na.sub.2 O 6-0 ZnO 6-0 CdO 6-0 BaO 10-0 SrO 6-0 ZrO.sub.2 5-0 TiO.sub.2 5-0 La.sub.2 O.sub.3 7-0 Al.sub.2 O.sub.3 5-0 B.sub.2 O.sub.3 9-0 Sb.sub.2 O.sub.3 +As.sub.2 O.sub.3 2-0 ______________________________________
- and wherein the composition of the glass includes 1-10 wt.% of K.sub.2 O + Na.sub.2 O.
Dependencies are inferred from the claim text.