Browse Prior Art Database

Copier Illumination Device

IP.com Disclosure Number: IPCOM000087476D
Original Publication Date: 1977-Feb-01
Included in the Prior Art Database: 2005-Mar-03
Document File: 2 page(s) / 26K

Publishing Venue

IBM

Related People

Prahl, ME: AUTHOR [+2]

Abstract

This illumination device includes a mirror mask, one end of which includes thin section lines such that that end of the mask can be manually broken off during manufacture, to compensate for the mirror's light intensity roll-off at this end.

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Copier Illumination Device

This illumination device includes a mirror mask, one end of which includes thin section lines such that that end of the mask can be manually broken off during manufacture, to compensate for the mirror's light intensity roll-off at this end.

Fig. 1 shows a portion of a copier having a stationary document glass or platen 10, a stationary lamp and reflector assembly 11, a stationary paraboloid mirror 12, and a movable mirror 13. An opaque mask 14, mounted in front of mirror 12, controls distribution of the light which is reflected from mirror 12 to mirror 13. This light then is reflected off mirror 13 onto platen 10. As a result, light is reflected from the document's light/dark areas onto the copier's photosensitive material (not shown).

Variations in the reflectance characteristics of mirror 12 make it desirable to form mask 14 such that one or both of its ends include thin, parallel section lines 15 (Fig. 2). During adjustment of the copier's illumination/optics mechanism, small portions of the end of mask 14 may be broken off (Fig. 3), in order to increase the intensity of the light reflected from that end of mirror 12.

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