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Browse Prior Art Database

Contact Bounce Eliminator

IP.com Disclosure Number: IPCOM000092436D
Original Publication Date: 1966-Nov-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 47K

Publishing Venue

IBM

Related People

Larson, S: AUTHOR [+2]

Abstract

The electronic circuitry of drawing 1 eliminates undesirable electrical signals generated by the bouncing of mechanical contact 10 during its operation. Drawing 2 shows the timing relationship of the circuitry.

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Contact Bounce Eliminator

The electronic circuitry of drawing 1 eliminates undesirable electrical signals generated by the bouncing of mechanical contact 10 during its operation. Drawing 2 shows the timing relationship of the circuitry.

Latch 12 comprises two And's 14 and 16 and two Or's 18 and 20. Or 18 in association with Inverter 22 comprises single-shot 24. Or 20 in association with Inverter 26 comprises single-shot 28. In single-shot 24, the signal shift of Or 18 is switched to Inverter 22 via capacitor 30, which forms the time constant for that network. Capacitor 32 performs a similar function in single-shot 28. The time constants are set to exceed any expected instability from the opening or closing of contact 10. Both polarities of the input signal are required to suppress noise when contact 10 is both opened and closed. Inverter 34 is supplied to meet this requirement. The output voltage is available across terminals 36 or 38. The voltage across terminals 40 and 42 can be used for strobing or additional timing purposes.

In drawing 2, curve 50 represents the signal at junction 44. Curve 52 represents the signal on line 46. Curve 54 represents the signal at terminal 36. Curve 56 represents the signal at terminal 38. The ancillary signals at terminals 40 and 42 are represented by curves 58 and 60 respectively.

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