Browse Prior Art Database

Copier Optics System

IP.com Disclosure Number: IPCOM000089270D
Original Publication Date: 1977-Oct-01
Included in the Prior Art Database: 2005-Mar-04
Document File: 2 page(s) / 30K

Publishing Venue

IBM

Related People

Makosch, G: AUTHOR [+2]

Abstract

The document is placed upside down on glass plate 1. Via aspherical mirror 4 and plane mirror 2 light from light source 3 is focussed in the form of a narrow stripe onto the document. The illuminated stripe of the document is imaged on drum 6 via plane mirror 2 and lens system 5. The optical axis of lens system 5 is inclined by 45 degrees to document glass plate 1. As a result of this, the distance between object and drum remains constant during the whole scanning motion of mirror 2, which moves along the optical axis.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 100% of the total text.

Page 1 of 2

Copier Optics System

The document is placed upside down on glass plate 1. Via aspherical mirror 4 and plane mirror 2 light from light source 3 is focussed in the form of a narrow stripe onto the document. The illuminated stripe of the document is imaged on drum 6 via plane mirror 2 and lens system 5. The optical axis of lens system 5 is inclined by 45 degrees to document glass plate 1. As a result of this, the distance between object and drum remains constant during the whole scanning motion of mirror 2, which moves along the optical axis.

The length of mirror 2 corresponds to the length of the stripe to be copied,
i.e., either to the long or the short side of the document. The width of mirror 2 is approximately equal to the clear aperture of lens system 5. In other words, mirror 2 must be wide enough to convey the cone of light having its apex in a point of the illuminated stripe, its base being identical to the lens aperture. Because of its small size, mirror 2 has a low mass, so that scanning can be performed at high speed. Mirror 2 is vertically positioned, and thus is relatively insensitive to contamination.

1

Page 2 of 2

2

[This page contains 2 pictures or other non-text objects]