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CONCAVE REFLECTOR AS IMAGE FORMING ELEMENT IN A SCANNING SYSTEM

IP.com Disclosure Number: IPCOM000023036D
Original Publication Date: 1976-Jul-31
Included in the Prior Art Database: 2004-Mar-27
Document File: 2 page(s) / 276K

Publishing Venue

Xerox Disclosure Journal

Abstract

In any system in which a "half~lens~or reflector lens is used, as for example a photocopying scanning system, the concept here is that the lens and the reflector can be re~ placed by a concave or spherical mirror which would serve the functions of both~ That is, the spherical mirror would reflex the optical axis and image the scanned object through an image slit on a moving drums

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Page 1 of 2

XEROX DISCLOSURE JOURNAL

CONCAVE REFLECTOR AS IMAGE
FORMING ELEMENT IN A SCANNING
SYSTEM

Proposed Classification
U~S~Cl. 350/66
Into CL GO2b

3 - - - - - - - - -

/

FIG. /

7

Volume 1 Number 7 July 1976 47

A

A

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FIG. 2

In any system in which a "half~lens~or reflector lens is
used, as for example a photocopying scanning system, the
concept here is that the lens and the reflector can be re~
placed by a concave or spherical mirror which would serve
the functions of both~ That is, the spherical mirror would
reflex the optical axis and image the scanned object through
an image slit on a moving drums

The Gaussian equation for thin lenses, + ~, = ~, also
applies to spherical mirrors~ Thus, for a ~X magnification
the total conjugate is four times the focal length of the
mirrors The focal length of the mirror in turn is one half
its radius of curvatures

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

Page 2 of 2

CONCAVE REFLECTOR AS IMAGE FORMING ELEMENT IN A SCANNING SYSTEM (Cont~d)

Spherical mirrors are limited as to their field of view by
spherical aberration and so are practically limited to use
with paraxial rays

             1 so that the proposed system is best used
for narrow slit scanning and not for full frame exposure.

Paraboloidal mirrors are free from spherical aberration.
It may be preferable to have the mirror '~spherical"

                                    1 i.e.
cylindrical
1 in the meridian A~Aof the sketch (the narrow
dimension of the exposure slit), and parabolic in the
meridian B~B, (the long dimension of the expos...