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Optical Fiber-Based Imaging System for a Serial Facsimile Machine

IP.com Disclosure Number: IPCOM000038518D
Original Publication Date: 1987-Jan-01
Included in the Prior Art Database: 2005-Jan-31
Document File: 2 page(s) / 47K

Publishing Venue

IBM

Related People

Kerth, RT: AUTHOR [+3]

Abstract

The imaging optics for a new scanner takes advantage of the optical properties of the SELFOC* lens array (SLA) and a tapered coherent fiber bundle. A SELFOC lens is an optical fiber which has a graded index of refraction profile. The incident beam travels sinusoidally, and by selecting the proper fiber length, such as half a pitch, the object image is transferred, through the fiber, to the opposite end, as shown in Fig. 1. Due to a mismatch between the resolution requirement and the physical pixel size of the CCD (charge-coupled device) array, an image reducer is required to appropriately transfer the image from the doc ument onto the CCD. This task is accomplished by using a tapered coherent fiber-optic bundle.

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Optical Fiber-Based Imaging System for a Serial Facsimile Machine

The imaging optics for a new scanner takes advantage of the optical properties of the SELFOC* lens array (SLA) and a tapered coherent fiber bundle. A SELFOC lens is an optical fiber which has a graded index of refraction profile. The incident beam travels sinusoidally, and by selecting the proper fiber length, such as half a pitch, the object image is transferred, through the fiber, to the opposite end, as shown in Fig. 1. Due to a mismatch between the resolution requirement and the physical pixel size of the CCD (charge-coupled device) array, an image reducer is required to appropriately transfer the image from the doc ument onto the CCD. This task is accomplished by using a tapered coherent fiber-optic bundle. A tapered coherent fiber-optic bundle is a bundle of optical fibers in which the fibers have a coherent spatial relationship, and the input and output fiber face dimensions are determined by the tapering ratio of the individual fibers in the bundle. For example, to capture an image with 250-pel resolution and a CCD pixel size of 1 mil requires a tapering ratio of 4 to 1 to transfer the image onto the CCD array. Coupling a SLA with a tapered coherent fiber bundle and a CCD array (Fig. 2) as the imaging system for a facsimile machine eliminates the need for a bulky imaging lens with aberration corrections, which implies less component and packaging costs. Furthermore, this system requires the...