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Generation of X and Y Coordinate Information

IP.com Disclosure Number: IPCOM000098571D
Original Publication Date: 1959-Apr-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 60K

Publishing Venue

IBM

Related People

Bezgin, A: AUTHOR

Abstract

It is often desired to place a probe on a surface and generate electrical X and Y coordinate information in accordance with the position of the probe on a reference axis system (first drawing). If the surface has a conductive coating, and is energized by a dc source along one axis (Y) and along the other axis (X) by an ac energized center tapped transformer, an electrical reference axis system is generated by the dotted lines. As a result, when the probe is moved along the Y axis, a dc voltage is applied to the probe having a magnitude commensurate with the displacement and a polarity determined by the direction of that displacement. If the probe is moved along the X axis, an ac voltage is applied to the probe having a magnitude commensurate with the displacement and a Phase determined by the direction of that displacement.

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Generation of X and Y Coordinate Information

It is often desired to place a probe on a surface and generate electrical X and Y coordinate information in accordance with the position of the probe on a reference axis system (first drawing). If the surface has a conductive coating, and is energized by a dc source along one axis (Y) and along the other axis (X) by an ac energized center tapped transformer, an electrical reference axis system is generated by the dotted lines. As a result, when the probe is moved along the Y axis, a dc voltage is applied to the probe having a magnitude commensurate with the displacement and a polarity determined by the direction of that displacement. If the probe is moved along the X axis, an ac voltage is applied to the probe having a magnitude commensurate with the displacement and a Phase determined by the direction of that displacement.

The probe, therefore, has a composite voltage at its output which may have both a dc component and an ac component commensurate with the X and Y coordinate information, respectively. This ac component then passes through an amplifier to provide an output voltage commensurate with the desired coordinate displacement. This voltage is applied to an analog to digital converter, if digital output information is required. Similarly, the dc component passes through a filter which is designed to attenuate or reject the ac component and is utilized to modulate an

(Image Omitted)

ac carrier to provide an ac o...