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Reduction Optics Mode Sensing

IP.com Disclosure Number: IPCOM000087281D
Original Publication Date: 1977-Jan-01
Included in the Prior Art Database: 2005-Mar-03
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Hardman, JL: AUTHOR [+2]

Abstract

This is a positive indication system to prevent damage to moving parts which move into the same space at different times during machine operation. More specifically, in a reduction-optics system with scanning lens and movable mirrors, switches are provided to sense lens and mirror positions.

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Reduction Optics Mode Sensing

This is a positive indication system to prevent damage to moving parts which move into the same space at different times during machine operation. More specifically, in a reduction-optics system with scanning lens and movable mirrors, switches are provided to sense lens and mirror positions.

In the optical system depicted in U.S. Patent 3,897,148 (see Figs. 5, 6, 10 and 11 thereof), the lens is moved along the vertical axis from 1:1 to R1 (first reduction) and to R2 (second reduction). One of these three positions must be selected prior to scanning the lens in a horizontal direction across the document to be copied. The movable mirrors are adjusted vertically in the machine to one of three positions corresponding to the lens position to compensate for changes in the total conjugate length of the optical path.

Sensing switches are placed at the 1:1 and R1 lens positions and the R2 position for the mirror, and scanning the lens is prohibited unless one of the three switches is made. In that manner, a scanning of the lens at an R2 position with the mirrors at a 1:1 or R1 position is prevented.

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