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Browse Prior Art Database

Holographic Scanning Disk with Auxiliary Data Track

IP.com Disclosure Number: IPCOM000051165D
Original Publication Date: 1982-Aug-01
Included in the Prior Art Database: 2005-Feb-10
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Broockman, EC: AUTHOR

Abstract

Briefly, an auxiliary data track is encoded at the rim of a holographic scanning disc. Optically or magnetically encoded data can represent disc characteristics, scanner identification or price look-up information for high volume products.

This text was extracted from a PDF file.
This is the abbreviated version, containing approximately 95% of the total text.

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Holographic Scanning Disk with Auxiliary Data Track

Briefly, an auxiliary data track is encoded at the rim of a holographic scanning disc. Optically or magnetically encoded data can represent disc characteristics, scanner identification or price look-up information for high volume products.

A known type of supermarket scanner uses a transparent, rotating disc with holographic optical elements. The annular area adjacent the rim of the disc could be used for an auxiliary data storage track. Data could be encoded optically in the form of bar coded symbols or magnetically using conventional recording codes.

The recorded data could be used for a number of purposes. The average disc diffraction efficiency for both scanning and diagnostic facets of the holographic disc could be encoded. The encoded values could be used in setting gains in the scanner signal processing circuitry. More detailed information about particular facets (e,g., desired digital filtering values) might also be encoded.

The auxiliary data might also be used to provide a record of the particular release level of the scanner. As a related use, the auxiliary data storage could be encoded with software patches which would be read in by the processor as part of the scanner start-up operation.

Price look-up information for high volume products might also be magnetically encoded on an auxiliary data track. This would permit price look-up to be performed at the scanner for a limited number of items rather t...