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Browse Prior Art Database

Multiple Option Holographic Scanning Disk

IP.com Disclosure Number: IPCOM000037829D
Original Publication Date: 1989-Jul-01
Included in the Prior Art Database: 2005-Jan-30
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Cato, RT: AUTHOR [+3]

Abstract

This article describes a multiple option holographic disk that may be used in a single scanner to provide different scan patterns. Referring to the drawing, facets identified with an A prefix provide one disk design which might be used to provide an omni-directional scan pattern with a large depth of field. The facets on the outer perimeter of the disk would be used to generate the scanning beam. The returned light would be collected by the same facet and by a related facet on the same diameter on the disk. The combined area of each set of A facets would vary as a function of the focal length of the beam produced by those facets.

This text was extracted from a PDF file.
This is the abbreviated version, containing approximately 91% of the total text.

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Multiple Option Holographic Scanning Disk

This article describes a multiple option holographic disk that may be used in a single scanner to provide different scan patterns. Referring to the drawing, facets identified with an A prefix provide one disk design which might be used to provide an omni-directional scan pattern with a large depth of field. The facets on the outer perimeter of the disk would be used to generate the scanning beam. The returned light would be collected by the same facet and by a related facet on the same diameter on the disk. The combined area of each set of A facets would vary as a function of the focal length of the beam produced by those facets.

The facets identified by the B prefix would be suitable for a raster scan application, which is less likely to have a large depth of field. The B facets would serve both to generate the scanning beam and to collect returning light.

The scanner might include a moveable mirror to shift the laser beam from a point of alignment with the outermost A track to the B track or vice versa when one or the other of the applications was to be selected. While the beam setup would normally be established upon initial installation of the scanner, it is possible to shift the beam during scanner operation by remote control if that is desired.

The centers of the facets in the B disk are angularly offset from the center of the facets in the A disk. This prevents an out-of-focus image of the scanning spot from the un...