Browse Prior Art Database

Multiple Diode Array Optics

IP.com Disclosure Number: IPCOM000088366D
Original Publication Date: 1977-Jun-01
Included in the Prior Art Database: 2005-Mar-04
Document File: 2 page(s) / 46K

Publishing Venue

IBM

Related People

Janeway, DL: AUTHOR [+2]

Abstract

An optical arrangement is shown for an optical and illumination system allowing multiple linear diode arrays to sense a scan line image as though they were physically abutted.

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Multiple Diode Array Optics

An optical arrangement is shown for an optical and illumination system allowing multiple linear diode arrays to sense a scan line image as though they were physically abutted.

Fig. 1 shows an implementation wherein an illumination system, comprised of lamp 11a and reflector 11b, focuses a narrow footprint of light 12a on the document being scanned 12. Reflected light from the document passes through the illumination system through an opening 21. A mirror 13 redirects the light to a lens 14. The lens focuses the light onto one or more diode arrays 15 located at the focal plane of the system. A splitter mirror 16, which is a "full-silvered" front surface mirror with one very small-radius, straight edge 22, is interposed into the bundle of light rays forming the image (Fig. 2). The splitter mirror is positioned to block approximately one-half of these rays, redirecting them to form a second image in space. Another one or more arrays 17 are placed at the second image. All components are mounted in a single carriage and transported along the document, scanning it line by line.

The effect is to allow multiple linear diode arrays to be optically abutted and to function as one linear array. Figs. 2 and 3 show two possible designs of a full-silvered splitter mirror. Both have advantages over "half-silvered" or pellicle beam splitters. Both provide more aberration-free images than a half-silvered beam splitter since second surface reflections in...