Digital measuring instruments

Details Digital measuring instruments Digital measuring instruments

1976-06-08

1978-09-26

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250231SE, 340347P, H01J 314

Patent

active

041173201

ABSTRACT:
A digital instrument produces a continuous digital readout representative of the linear movement of a member positioned by a rotatable shaft. The instrument comprises equally spaced markings formed on an element carried by a bushing intended to be secured to the shaft. Sensing means cooperate with the markings and produce an output pulse in response to the passage of a marking past the sensing means. The output pulses are counted by a reversible digital counter the count of the counter being displayed by digital display means. The electronic circuitry is carried by two printed circuit boards each of which supports a bearing for the bushing. A fixed casing fixedly supports the sensing means, the counter, the display means and the printed circuit boards.

REFERENCES:
patent: 2995705 (1961-08-01), Walker et al.
patent: 3693024 (1972-09-01), Hulle et al.
patent: 3757128 (1973-09-01), Vermeulen
patent: 3912926 (1975-10-01), Coulbourn
patent: 3967271 (1976-06-01), Day
patent: 3995156 (1976-11-01), Angersbach et al.
patent: 4010464 (1977-03-01), Wires et al.

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