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公开(公告)号：US3706055A
公开(公告)日：1972-12-12
申请号：US3706055D
申请日：1971-08-06
Applicant: THOMSON CSF
Inventor： DIEULESAINT EUGENE JEAN , HARTMAN PIERRE
CPC classification number: H03H9/423
Abstract: THE PRESENT INVENTION RELATES TO CONTINUOUSLY ADJUSTABLE DELAY LINES BASED UPON PROPAGATION OF A SURFACE VIBRATIONAL WAVE IN A PIEZOELECTRIC WAVE GUIDE WHICH IS PROVIDED AT ITS EXTREMITIES WITH INTERDIGITATED COMB-SHAPED ELECTRODES. THE DELAY LINE IN ACCORDANCE WITH THE INVENTION COMPRISES AT LEAST ONE COMB STRUCTURE THE TEETH OF WHICH ARE LINKED TO A COMMON CONNECTION BY A SEMICONDUCTOR LAYER WHICH IS RENDERED LOCALLY CONDUCTIVE BY MEANS OF A DISPLACEABLE LIGHT SPOT. THIS TYPE OF LINE CAN BE UTILISED IN A FREQUENCY RANGE EXTENDING FROM ONE MEGACYCLE TO SEVERAL HUNDREDS OF MEGACYCLES, IN ORDER TO PRODUCE DELAYS ADJUSTABLE FROM A FRACTION OF A MICROSECOND TO SEVERAL TENS OF MICROSECONDS.
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