公开(公告)号：DE2344684A1

公开(公告)日：1975-03-06

申请号：DE2344684

申请日：1973-09-05

Applicant: CRL ELECTRONIC BAUELEMENTE

Inventor： FINK RUDOLF DIPL-ING

IPC: H01G2/06 ,  H05K3/34 ,  H01G1/035

Abstract: The capacitor is made from a flat ceramic plate which can be round, rectangular or any other desired geometric shape. It is intended for mounting on printed circuit boards without the use of terminal leads. The electrode surfaces are on opposite faces of the plate. There is an open sloping cut out at the circumference, extending from the top surface to the edge of the bottom surface. The bottom is an electrode surface placed in direct contact with the printed wiring. The surface of the cut out is metallised, with the coating applied by a sintering, spraying or silk screening process. It provides access to the top which is the other electrode surface.

公开(公告)号：DE2335648A1

公开(公告)日：1975-01-30

申请号：DE2335648

申请日：1973-07-13

Applicant: CRL ELECTRONIC BAUELEMENTE

Inventor： FINK RUDOLF DIPL-ING

IPC: H03H3/08 ,  H03H9/02 ,  H03H9/00

Abstract: The piezoelectric acoustic surface wave filter prevents reflected waves from interfering with teh direct waves by forming the comb electrodes on the curved surface of a cylindrical or tubular body, onto which after size reduction metal is deposited onto its curved outer surface, followed by oxidising and sintering the metal layer and forming a reoxidised layer beneath the body surface. The reoxidised layer is ground and a second metal layer deposited. A voltage is applied between surface metal layer and the second layer, and the reoxidised layer is polarised. The body surface is then ground and polished to the required size and the curved surface coated with a good conductor by vacuum deposition. A photosensitive layer is then added by dipping, rolling or spraying to the curved surface and a photomask placed over it, corresponding to the shape of the final comb electrodes.