Photocopying – Projection printing and copying cameras – Illumination systems or details
Patent
1997-09-16
2000-01-11
Metjahic, Safet
Photocopying
Projection printing and copying cameras
Illumination systems or details
355 55, G03B 2754, G03B 2752
Patent
active
060142022
ABSTRACT:
An optical system is disclosed wherein an illumination device is used to project colored light into a lens and focus through a spatial light modulator onto a photosensitive medium wherein the illumination device is configured so as to produce a uniform light distribution through the use of an aperture stop, a symmetrical placement of solid state light sources such as LEDs, or by LEDs fabricated such that the top surface emitting the colored light is not obstructed by an electrode or contacts connecting the light-emitting diode to a current source. Such a configuration is accomplished by providing a substantially transparent attachment layer that may include an opaque conductive material, but preferably includes transparent conductive particles that, in combination, attach and electrically connect the LED to a first electrode disposed upon a substrate. The light source is configured and spaced so as to allow incorporation of the light source into a print head, such that the print head can expose a photosensitive medium and focus down to produce a relatively uniform strip of light. The print head remains in relative motion with the photosensitive medium and allows for a delayed printing of some of the color information of each uniform strip of light. The spacing employed in the lighting device separating light-emitting diodes is as precisely defined so as to ensure overlay of each of the colors red, green and blue on each line of the photosensitive medium.
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Chapnik Philip D.
DelPico Joseph
Egan Richard G.
Johnson Bruce K.
Gaiman Barry
Metjahic Safet
Moffard Donald F.
Nguyen Hung Henry
Polaroid Corporation
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