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Twisted Optics used in Copier Design

IP.com Disclosure Number: IPCOM000081997D
Original Publication Date: 1974-Sep-01
Included in the Prior Art Database: 2005-Feb-28
Document File: 2 page(s) / 65K

Publishing Venue

IBM

Related People

Smith, GL: AUTHOR

Abstract

Twisted optics are incorporated in a copier design without necessitating drum axis rotation. The method achieves an angular approach to the drum in a two mirror reciprocating lens system.

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Twisted Optics used in Copier Design

Twisted optics are incorporated in a copier design without necessitating drum axis rotation. The method achieves an angular approach to the drum in a two mirror reciprocating lens system.

It may be desirable in a copier to approach the copy drum at an angle instead of directly from the bottom. This allows the developer-cleaner to be located near the bottom of the drum, where better developer-cleaner characteristics can be achieved.

The angular approach can be achieved in a two mirror reciprocating lens system by twisting the optics system, as shown in Figs. 1 through 4.

Fig. 1 shows the unfolded optics system, while it is folded in Fig. 2. If the optics system is folded at two places with mirrors 1 and 2 along fold lines at the same angle theta, the resulting folded planes can be made parallel. If the resulting planes are parallel, no rotation of the drum axis will result.

Fig. 3 shows that the drum approach angle achieved is 2 theta. A horizontal and vertical offset of the drum location also results. Fig. 4 shows that the fold angles alpha and beta do not have to be 90 degrees, but alpha plus beta must equal 180 degrees to avoid rotating the drum axis.

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