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Manufacturing Process And Assembly Design for a Prefocussed Illumination Assembly

IP.com Disclosure Number: IPCOM000100634D
Original Publication Date: 1990-May-01
Included in the Prior Art Database: 2005-Mar-15
Document File: 2 page(s) / 60K

Publishing Venue

IBM

Related People

Grant, DE: AUTHOR [+3]

Abstract

In many current copiers the field replacement of lamps in the illumination system is a difficult and time consuming process because of the need for critical focusing. A manufacturing process is described for prefocusing and "fixing" of the lamp into an assembly which serves as a field replaceable unit (FRU) which can be installed simply at low cost.

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Manufacturing Process And Assembly Design for a Prefocussed Illumination Assembly

       In many current copiers the field replacement of lamps in
the illumination system is a difficult and time consuming process
because of the need for critical focusing.  A manufacturing process
is described for prefocusing and "fixing" of the lamp into an
assembly which serves as a field replaceable unit (FRU) which can be
installed simply at low cost.

      The manufacturing method involves adjustment of the lamp within
its mounting assembly while it is in a focusing fixture 10 (Fig. 1).
Fixture 10 consists of base 11 on which are mounted lamp holder 12,
lens and mirror holder 13 and focusing screen holder 14.  Lamp holder
12 is capable of rotating lamp assembly 15 in vertical and horizontal
positions through the action of joy-stick slide 16.  Holder 13
contains horizontal positioning lens 17, mirror 18 and vertical
positioning lens 19.  These elements are aligned to focus the lamp
filaments onto vertical position screen 20 and horizontal screen
position 21 in holder 14.

      In operation lamp assembly 15 is preassembled with the
necessary lamp clips and ceramic bases and the lamp slotted bracket
and fixture plate (not illustrated) are screwed on. The preassembled
lamp parts are then mounted into holder 12 for movement of the
critical vertical and horizontal positions of the lamp filaments.
These positions are established by projecting a magnified image of
the filamen...