Browse Prior Art Database

Readout Device for Digital Information Stored by Surface Relief Techniques

IP.com Disclosure Number: IPCOM000093850D
Original Publication Date: 1966-Mar-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 2 page(s) / 33K

Publishing Venue

IBM

Related People

Nepala, DA: AUTHOR [+2]

Abstract

Digital information can be stored by surface relief techniques such as thermoplastic recording, and photoplastic recording or frost deformation. The recorded data takes the form of deformations or depressions in the record surface.

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Readout Device for Digital Information Stored by Surface Relief Techniques

Digital information can be stored by surface relief techniques such as thermoplastic recording, and photoplastic recording or frost deformation. The recorded data takes the form of deformations or depressions in the record surface.

Readout of this stored information is accomplished by devices having an air- bearing head containing a pressure sensing element. Local pressure variations in the air film corresponding to the surface deformation of the record are detected by the pressure sensing element.

In drawing 1, piezoelectric transducer 1 comprises the pressure sensing element and is positioned to pass adjacent recording surface 2. To increase the readout signal, a fluid amplifier 3, as shown in drawing 2, can be used in conjunction with piezoelectric transducer 4. Alternatively, volume resonant chamber 5, as shown in drawings 3 and 4, can also be used in conjunction with piezoelectric transducer 6. In addition, a bias can be applied to chamber 5 by a port 7 through which a positive pressure is applied to the chamber, as shown in drawing 4.

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