Browse Prior Art Database

Acoustical Data Input Panel

IP.com Disclosure Number: IPCOM000090881D
Original Publication Date: 1969-Aug-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 25K

Publishing Venue

IBM

Related People

Gunn, JB: AUTHOR [+2]

Abstract

An input tablet for applying input data to a computer is formed of a panel 10 of acoustic low-loss material such as glass. Information is entered by a stylus which has an ultrasonic transducer in its tip. When the tip is placed in contact with panel 10, a wave is launched from the point of contact and sensed by X and Y transducers at the edge of such panel. The time of sensing gives the position of the stylus and can be digitized by X and Y counters. These start when the stylus is energized and are stopped and interrogated in response to the initial sensing of the acoustical wave by the X and Y transducers. When the tip is placed in contact with panel 10, a wave is launched from the point of contact and sensed by X and Y transducers at the edge of such panel.

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Acoustical Data Input Panel

An input tablet for applying input data to a computer is formed of a panel 10 of acoustic low-loss material such as glass. Information is entered by a stylus which has an ultrasonic transducer in its tip. When the tip is placed in contact with panel 10, a wave is launched from the point of contact and sensed by X and Y transducers at the edge of such panel. The time of sensing gives the position of the stylus and can be digitized by X and Y counters. These start when the stylus is energized and are stopped and interrogated in response to the initial sensing of the acoustical wave by the X and Y transducers. When the tip is placed in contact with panel 10, a wave is launched from the point of contact and sensed by X and Y transducers at the edge of such panel. The time of sensing gives the position of the stylus and can be digitized by X and Y counters. These start when the stylus is energized and are stopped and interrogated in response to the initial sensing of the acoustical wave by the X and Y transducers. The device can also be operated by energizing a transducer on one side of the panel which, due to reflections at the panel edges, causes a standing wave to be produced. The frequency is adjusted to obtain something less than a quarter wave across the length of the panel so that there is a relatively uniform variation of amplitude with distance which can be sensed by the transducer in the stylus. The operation is repeated for both...