Browse Prior Art Database

SINGLE SELFOC IMAGING SYSTEM FOR SILICON MICRODEFLECTORS

IP.com Disclosure Number: IPCOM000025604D
Original Publication Date: 1986-Aug-31
Included in the Prior Art Database: 2004-Apr-04
Document File: 4 page(s) / 208K

Publishing Venue

Xerox Disclosure Journal

Abstract

Referring to Figure 1, SelfocT" lens arrays 2, 3 are generally considered to be the most appropriate imaging device for image exposure systems employing a silicon microdeflector array 4 as modulator. In Figure 1, a sheet-like beam of light 5 is impinged onto the row of flexible reflecting fingers 6 of the microdeflector array 4 by means of lens array 2 By applying a suitable voltage to different ones of the fingers 6 of the microdeflector array 4 in accordance with an image signal input, those portions of the light 5 striking the deflected fingers are reflected to a lens array 3 and imaged onto a photoreceptor 8 to expose the photoreceptor and form an image represented by the image signal input.

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(EROX DISCLOSURE JOURNAL

SINGLE SELFOC TN IMAGING SYSTEM FOR SILICON MICRODEFLECTORS U.S. C1.358/200 Norman E. Wright

Proposed Classification

Int. C1. H04n 3/02

Volume 11 Number 4 July/August 1986 187

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SINGLE SELPOC rw IMAGING SYSTEM FOR SILICON MICRODEFLECTORS (Cont'd)

DISCLOSURE XEROX 188 JOURNAL

Volume I1 Number 4 July/August 1986

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SINGLE SELPOC '* IMAGING SYSTEM FOR. SILICON MICRODEFLECTORS (Cont'd)

Referring to Figure 1, SelfocT" lens arrays 2, 3 are generally considered to be the most appropriate imaging device for image exposure systems employing a silicon microdeflector array 4 as modulator. In Figure 1, a sheet-like beam of light 5 is impinged onto the row of flexible reflecting fingers 6 of the microdeflector array 4 by means of lens array 2 By applying a suitable voltage to different ones of the fingers 6 of the microdeflector array 4 in accordance with an image signal input, those portions of the light 5 striking the deflected fingers are reflected to a lens array 3 and imaged onto a photoreceptor 8 to expose the photoreceptor and form an image represented by the image signal input.

Microdeflector array 4 controls the final image by reflecting the image into or out of the numerical aperture of the second lens array 3, effectively turning each image pixel along the image line on or off The angle of deflection at the microdeflector array 4 must be sufficient to cause all the light reflected by the non-deflected fingers of microdeflector 4 to miss entering the field angle of the lens array 3. Thus, an increase in the acceptance angle of the lens array 3 increases the amount of deflection required by the fingers 6 of microdeflector array 4.

Characteristically, a Selfocr" lens array modulates illuminance an the image plane due to overlapping of images from individual lens fibers and the characteristic illuminance properties of the individual lens fibers. Because of illuminance modulation, a lens array having two rows of optical fibers is considered optimum since the aforementioned modulation is minimized For a system using a two row Iens array however, careful ahgnment of the two rows of lens fibers offsets some illuminance modulation by setting the maximum points of modulation from one row of lens fibers in between the maxima of the other However, the addition of another row of lens fibers to the lens array increases the numeric aperture of the lens array and greater deflection angles are then required at the microdeflector array to achieve an equivalent contrast ratio.

There is here proposed a system which allows the use of one two row lens array having an effective numeric aperture of a single row array Referring to Figure 2, one row 11 of a two row lens array 10 images an illuminated line 13 onto the microdeflector array 4 which, in turn, deflects the reflected light into or out of the ac...