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Copier Optics Alignment Procedure

IP.com Disclosure Number: IPCOM000084384D
Original Publication Date: 1975-Nov-01
Included in the Prior Art Database: 2005-Mar-02
Document File: 2 page(s) / 38K

Publishing Venue

IBM

Related People

Rhodes, JH: AUTHOR

Abstract

This alignment procedure uses the photoconductor's aperture as a reference. The document glass reference edge or corner is the last device to be adjusted.

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Copier Optics Alignment Procedure

This alignment procedure uses the photoconductor's aperture as a reference. The document glass reference edge or corner is the last device to be adjusted.

The figure shows a copier having a stationary document glass 10 having a reference edge or corner 11, against which an original document is registered prior to initiating the copy cycle. During the copy cycle a first carriage 12 moves to the right at a constant velocity, line scanning the original document with an elongated light footprint 13. This footprint is generated by line type light source 14 and mirror 15.

As carriage 12 moves to the right, a second carriage 16 moves to the right at one half the velocity of carriage 12. The light footprint reflected from the original document passes through stationary lens 17 and is reflected off mirror 18 to an elongated aperture 19 located adjacent rotating photoconductor drum 20.

In order to align the copier's optical/illumination apparatus during manufacture, a light source, such as laser 21 is placed in the drum cavity. Ideally, the laser 21 is mounted so that its center ray is at the drum's axial center, and in the tangential middle of the aperture 19.

The angle of mirror 18 is now adjusted to produce a horizontal or approximately horizontal ray 22. Carriage 16 is now adjusted so that its scan axis is parallel to ray 22. Lens 17 is adjusted to be centered on ray 22, with its optical axis coincident therewith.

Mirror 23 is now adju...