Browse Prior Art Database

High Resolution Shutter Array

IP.com Disclosure Number: IPCOM000108307D
Original Publication Date: 1992-May-01
Included in the Prior Art Database: 2005-Mar-22
Document File: 2 page(s) / 59K

Publishing Venue

IBM

Related People

Laff, RA: AUTHOR [+2]

Abstract

Disclosed is an optical device/arrangement for efficient high resolution line imaging from shutter arrays without a shutter imaging lens. The impact of shutter diffraction is minimized while maintaining good shutter to photosensitive medium or working distance. (Image Omitted)

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High Resolution Shutter Array

       Disclosed is an optical device/arrangement for efficient
high resolution line imaging from shutter arrays without a shutter
imaging lens.  The impact of shutter diffraction is minimized while
maintaining good shutter to photosensitive medium or working
distance.

                            (Image Omitted)

      An optical system (not shown) (1) focuses illumination 5 onto a
moving photosensitive medium 8 forming a line image 7.  A
two-dimensional image is produced with appropriately time information
to shutter array 6.  The shape of the shutters 9 has been elongated
to not limit the optical coupling from source to image (2) and to
eliminate diffraction from process direction shutter edges.  This
improves the resolution or working distance by 40%.  The process
direction shutter resolution is determined by the convolution of the
line image width produced by the source optics, the shutter exposure
time and the photosensitive medium velocity.  An additional source
optics requirement is needed for maximum resolution or working
distance.  The difference in the array axis angle of illumination
through an individual shutter should be less than about two degrees
which is the divergence angle due to diffraction.  A very reasonable
2.5 millimeter working distance yields a 50% modulation transfer
function at 14.3 line pairs per millimeter.

      An additional factor of two resolution or working dista...