Browse Prior Art Database

Conjugate-Length Adjustment Mechanism

IP.com Disclosure Number: IPCOM000046997D
Original Publication Date: 1983-Sep-01
Included in the Prior Art Database: 2005-Feb-07
Document File: 2 page(s) / 46K

Publishing Venue

IBM

Related People

Smith, GL: AUTHOR

Abstract

This article describes a simple mechanism for adjusting total conjugate length in a continuously variable reduction copier optics system. The figure shows a two-carriage scanning system in which a first carriage 10 and a second carriage 11 are moved across a document glass (not shown) in a reciprocating manner in order to scan light rays onto a document to be copied. Carriage 10 carries a lamp for producing the light rays and a reflecting surface for directing those rays to the document to be copied. Upon reflection from that document, the light rays are then directed by reflecting surface 12 to mirrors 13 and 14 mounted on carriage 11 and from there to appropriate optical elements, such as a lens and mirrors, and finally onto the imaging surface.

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Conjugate-Length Adjustment Mechanism

This article describes a simple mechanism for adjusting total conjugate length in a continuously variable reduction copier optics system. The figure shows a two- carriage scanning system in which a first carriage 10 and a second carriage 11 are moved across a document glass (not shown) in a reciprocating manner in order to scan light rays onto a document to be copied. Carriage 10 carries a lamp for producing the light rays and a reflecting surface for directing those rays to the document to be copied. Upon reflection from that document, the light rays are then directed by reflecting surface 12 to mirrors 13 and 14 mounted on carriage 11 and from there to appropriate optical elements, such as a lens and mirrors, and finally onto the imaging surface. Cable 15 is attached to carriage 10 at point 16 so that the carriage may be moved by motor 17 at an appropriate speed to produce a copy at the desired reduction ratio. Similarly, carriage 11 is moved through a connection to carriage 10 provided by cable 18 mounted on carriage 11 and attached to carriage 10 at point 19. Cable 18 is attached to a ground point through bracket 21 and point 22 by holding bracket 21 against a wall piece 20. Spring-locked friction shoe 23 provides the connection. In order to adjust total conjugate length, the ground point must be moved as more fully described in U.S. Patent 4,120,578. To accomplish that adjustment with the mechanisms described herein, sol...