Browse Prior Art Database

Light Profile Shaper

IP.com Disclosure Number: IPCOM000045017D
Original Publication Date: 1983-Jan-01
Included in the Prior Art Database: 2005-Feb-06
Document File: 2 page(s) / 48K

Publishing Venue

IBM

Related People

Konold, CJ: AUTHOR

Abstract

It is generally known to control the pattern of light from an elongated light source by specially configured apertures, controlled reduction of center area light, enhancement of peripheral area reflectivity, or combinations thereof. In the example described, light intensity associated with the reduced areas is enhanced by patterns producing increased reflectivity at the reduced zones.

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Light Profile Shaper

It is generally known to control the pattern of light from an elongated light source by specially configured apertures, controlled reduction of center area light, enhancement of peripheral area reflectivity, or combinations thereof. In the example described, light intensity associated with the reduced areas is enhanced by patterns producing increased reflectivity at the reduced zones.

In the example shown, light shield 10 is formed of two L-shaped members 11 and 12, formed of material such as aluminum. Elongated fluorescent lamps 15 and 16 are attached to conventional socket bases 18 and 19 for illuminating original documents placed on the upper surface of transparent glass 20. Members 11 and 12 are held in position by means not shown so as to define a slit 21 in which a self focusing lens 22 is located as for use in imaging a photoconductor in a copier. As best seen in Fig. 3, light shield members 11 and 12 are left unpainted in the triangularly shaped areas 30 and 31, whereas all areas, such as 32 and 33, outside of the triangularly-shaped area 30 and 34 and 35 outside of the triangularly-shaped area 31 are painted with a material having a reflectivity preferably of 95% or greater. Although lesser reflectivity is acceptable in some cases, and different shapes from triangular shapes are usable In some circumstances, the triangularly-shaped areas 30 and 31 were found to provide excellent flattening of the light profile as ultimately reflected...