The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 11, 2000
Filed:
Sep. 16, 1997
Philip D Chapnik, Newton, MA (US);
Bruce K Johnson, North Andover, MA (US);
Richard G Egan, Dover, MA (US);
Joseph DelPico, Brockton, MA (US);
Polaroid Corporation, Cambridge, MA (US);
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.