Browse Prior Art Database

Tape Sensing Devices

IP.com Disclosure Number: IPCOM000095272D
Original Publication Date: 1965-Nov-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 46K

Publishing Venue

IBM

Related People

Huckabee, JM: AUTHOR

Abstract

The arrangements are for sensing the position of a movable dielectric tape and providing an electrical output signal corresponding to such position. Fluid logic element 10 has thin tape 11 of dielectric material that is received in elongated slot 12. One end 13 of tape 11 is attached to the housing. The other movable end of tape 11 has a varying size or shape due to the provision of aperture 16. Disposed in the housing on opposite sides of slot 12 adjacent to the movable end of tape 11 are a pair of electrodes 17 and 18 and large electrode 19. Electrodes 17 and 18 are connected to a balanced source of AC. Electrode 19 is connected in the base circuit of transistor 21.

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Tape Sensing Devices

The arrangements are for sensing the position of a movable dielectric tape and providing an electrical output signal corresponding to such position. Fluid logic element 10 has thin tape 11 of dielectric material that is received in elongated slot 12. One end 13 of tape 11 is attached to the housing. The other movable end of tape 11 has a varying size or shape due to the provision of aperture 16. Disposed in the housing on opposite sides of slot 12 adjacent to the movable end of tape 11 are a pair of electrodes 17 and 18 and large electrode
19. Electrodes 17 and 18 are connected to a balanced source of AC. Electrode 19 is connected in the base circuit of transistor 21.

When element 10 is in the state shown with aperture 16 positioned outwardly of electrodes 17 and 18, the capacitance between plates 17 and 19 and 18 and 19 is balanced. No signal is supplied from plate 19 to the base of transistor 21. However, when a pneumatic signal is applied to port 22, tape 11 is deflected into cavity 23. Aperture 16 moves beneath the plate 17 or 18. An unbalance condition exists and the resultant signal at plate 19 changes the energization of transistor 21.

The lower drawing shows a position-to-analog signal convertor. This uses coded tape 24 which has areas of various sizes or shapes provided by different size apertures 25. As tape 24 passes through the differentiating capacitor plates 26, 27 and 28, a direct reading is obtained on meter 29 which indicates...