Illumination slit for a reproducing machine
AssigneeXerox Corporation
InventorRobert F. Allis
Life of this patent
Estimating the term…
Abstract
An improved exposure slit system for controlling the projected image illumination profile of an optical system of a reproducing machine. The optical system is arranged to stripwise view a document. The exposure slit system includes one exposure slit member arranged near the object plane and a second exposure slit member arranged near the image plane. The exposure slit profile for controlling illumination at the image plane is comprised in part by the profile of the exposure slit member at the image plane and in part by the profile of the exposure slit member near the object plane as projected at the image plane.
Claims11
In an apparatus including means for stripwise viewing an object at an object plane and for projecting an image thereof onto a moving imaging surface at an image plane, said viewing means being arranged along an optical path, said viewing means including:
- a lens arranged along said optical path between said object plane and said image plane;
- and
- means for controlling the projected illumination profile of said viewing means, including means for defining an illumination slit having a desired slit profile for controlling said illumination;
- the improvement wherein, said means for defining said illumination slit comprises:
- a first member arranged along said optical path between said lens and said object plane, said first member including a first boundary portion for defining a first part of said desired slit profile;
- and
- a second member arranged along said optical path between said lens and said image plane, said second member including a second boundary portion for defining a second part of said desired slit profile different from said first part;
- whereby said first boundary of said first member as projected and said second boundary of said second member combine to define said desired slit profile.
In a reproducing apparatus including means for forming an image on a sheet of final support material, said image forming means including means for stripwise viewing an object at an object plane and for projecting an image thereof onto a moving imaging surface at an image plane, said viewing means being arranged along an optical path, said viewing means including:
- a lens arranged along said optical path between said object plane and said image plane;
- and
- means for controlling the projected illumination profile of said viewing means, including means for defining an illumination slit having a desired slit profile for controlling said illumination;
- the improvement wherein said means for defining said illumination slit comprises:
- a first member arranged along said optical path between said lens and said object plane, said first member including a first boundary portion for defining a first part of said desired slit profile;
- and
- a second member arranged along said optical path between said lens and said image plane, said second member including a second boundary portion for defining a second part of said desired slit profile different from said first part;
- whereby said first boundary of said first member as projected and said second boundary of said second member combine to define said desired slit profile.
Dependencies are inferred from the claim text.