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Optical Engineering • Open Access

Lensless image scanner using multilayered aperture array for noncontact imaging
Author(s): Hiroyuki Kawano

Paper Abstract

We propose a new imaging system of a simple structure that uses a set of layered aperture arrays above a linear image sensor instead of an imaging lens. The image scanner transfers the image information by detecting the scattering rays from the object directly without any collecting power, as if it were an optical stamp. Since the aperture arrays shield the stray rays propagating obliquely, the image information can be read with high resolution even if the object floats within a few millimeters. The aperture arrays with staggered alignment in two lines widen the space with the adjacent pixel without decimating information. We manufactured a prototype model of 300-dpi resolution, whose height is as little as 5 mm. The experimental result shows that ghost images can be restricted sufficiently, and our scanner can clearly read an object within a space of <3.5  mm, meaning that it has a large depth of field of 3.5 mm.

Paper Details

Date Published: 18 October 2016
PDF: 6 pages
Opt. Eng. 55(10) 103106 doi: 10.1117/1.OE.55.10.103106
Published in: Optical Engineering Volume 55, Issue 10
Show Author Affiliations
Hiroyuki Kawano, Mitsubishi Electric Corp. (Japan)

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