Browse Prior Art Database

ACOUSTIC SURFACE WAVE OPTICAL SCANNER

IP.com Disclosure Number: IPCOM000023412D
Original Publication Date: 1977-Oct-31
Included in the Prior Art Database: 2004-Mar-30
Document File: 2 page(s) / 365K

Publishing Venue

Xerox Disclosure Journal

Abstract

An acoustic surface wave travels on the surface of a piezo-electric crystal (from left to right in the drawing) and encounters sequentially N electrodes. Each electrode is connected serially to a small photoconductor, The other side of each photoconductor is connected to a common output elec-trode, When the acoustic surface wave pulse arrives at a photoconductor which is in the dark, its high impedance blocks the passage of the acoustic energy to the common electrode, In the case that the photoconductor is illuminated, the common electrode is excited, Thus, the spatial distribution of the illumination is translated into a temporal output.

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Page 1 of 2

XEROX DISCLOSURE JOURNAL

~STIC~SURFACE~WAvE OPTICAL
SCANNER
Dror Sand

Proposed Classification
tLS~ Cl~ l78/7~6
Into Cl~ H04n 3/00

v~x

An acoustic surface wave travels on the surface of a piezo-
electric crystal (from left to right in the drawing) and
encounters sequentially N electrodes. Each electrode is
connected serially to a small photoconductor, The other side
of each photoconductor is connected to a common output elec-
trode, When the acoustic surface wave pulse arrives at a
photoconductor which is in the dark, its high impedance blocks
the passage of the acoustic energy to the common electrode,
In the case that the photoconductor is illuminated, the common
electrode is excited, Thus, the spatial distribution of the
illumination is translated into a temporal output.

Volume 2 Number 5 September/October 1977 59

[This page contains 1 picture or other non-text object]

Page 2 of 2

ACOUSTIC-SURFACE-WAVE OPTICAL SCANNER (Cont~d)

The arrangement described above, which is known, has the draw-
back that the acoustic surface wave pulse is attenuated
appreciably after passing some tens of electrodes so that a
full page high resolution scanner is impossible~

The present concept suggests to output a small fraction of the
acoustic surface wave pulse every ~ electrodes, to amplify it
and to inject a reinforced signal to the next contacts
Several amplification stages will maintain the power of the
acoustic surface wave pulse for as long a passage as is
required~ The behavior of the acoustic surf...