Browse Prior Art Database

Digital Micrometer

IP.com Disclosure Number: IPCOM000097698D
Original Publication Date: 1961-Apr-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 36K

Publishing Venue

IBM

Related People

Bourne, DA: AUTHOR

Abstract

The micrometer is provided with a digital readout for entering information, proportional to a measurement, into a computer register.

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Digital Micrometer

The micrometer is provided with a digital readout for entering information, proportional to a measurement, into a computer register.

Closure of the micrometer upon the specimen to be measured transmits a pressure to piezoelectric crystals XT and XP. These crystals convert the pressure to an electrical voltage. This is then transmitted to the register to indicate that the digital representation of the measurement is available.

This digital representation is generated by a further group of piezoelectric crystals X1... XN. Pressure is individually, selectively applied to the crystals under control of binary coded parallel tracks on the micrometer shaft. The number of tracks is determined by the resolution desired. For each setting of the micrometer, pressure is applied to a predetermined combination of the crystals X1... XN in accordance with the binary code. This pressure is obtained from selected portions of each track. The selected portions have a radius greater than the remaining portions. As indicated in the drawing, pressure is applied to crystals X1 and XN, representing 2 and 2/n-1/ respectively. In this manner, a voltage is generated by crystals X1 and XN and no voltage generated by crystals X2 and X/n-1/

Alternatively, magnetized binary encoded spots can be formed on the shaft and a number of magnetic read heads employed to obtain the digital representation.

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