Browse Prior Art Database

INPUT AND OUTPUT FLYING SPOT SCANNING SYSTEM

IP.com Disclosure Number: IPCOM000022907D
Original Publication Date: 1976-Apr-30
Included in the Prior Art Database: 2004-Mar-27
Document File: 2 page(s) / 301K

Publishing Venue

Xerox Disclosure Journal

Abstract

A flying spot scanning system is provided which is capable of scanning an unmodulated beam 20 to a platen 52, for reading a stationary document 54 thereon, and a modulated beam 16 to a photoconductive drum 42 for recording a latent image thereat. The beams 16 and 20 are split from beam 10 originating from a laser 12; the beam 20 being that portion of the beam 10 passing through a beam splitter 14, and beam 16 being that portion of

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Page 1 of 2

XEROX DISCLOSURE JOURNAL

INPUT AND OUTPUT FLYING
SPOT SCANNING SYSTEM
P. L. Chen

Proposed Classification

U.S. Cl. 178/7.6
mt. Cl, H04n 3/00

A flying spot scanning system is provided which is

capable of scanning an unmodulated beam 20 to a platen
52, for reading a stationary document 54 thereon, and a
modulated beam 16 to a photoconductive drum 42 for
recording a latent image thereat. The beams 16 and 20
are split from beam 10 originating from a laser 12; the
beam 20 being that portion of the beam 10 passing through
a beam splitter 14, and beam 16 being that portion of

beam 10 reflecting off of beam splitter 14, A modulator
18 modulates the beam 16. The beams 16 and 20 strike the
same facets of a rotating polygon scanner 24 at the same
location so that precise alignment of the facets will not
be required. Relatively movable mirrors 46 and 48 are
moved in a direction across the stationary document 54 to

.42

Volume 1 Number 4 April 1976 37

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INPUT AND OUTPUT FLYING SPOT SCANNING SYSTEM (Cont~d)

provide a scan of the beam 20 thereacross in a "Y" direction
in such a manner to maintain optical conjugates constant.
The beam 20 is scanned across the document 54 in the "X~
direction by the polygon 24, A strip diode 53 receives
the reflections from the document 54, The system utilizes
a cylindrical lens 34 and a spherical imaging lens 36 which
are common to both the unmodulated beam 16 and the modulated
beam 20 to avoid duplicat...