Switching apparatus for absolute position measuring device

Details Switching apparatus for absolute position measuring device Switching apparatus for absolute position measuring device

1981-12-07

1984-09-04

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

250237G, H01J 4014

Patent

active

044699409

ABSTRACT:
A switching apparatus for an absolute position measuring device of the type including a coded scale and a scanning unit for reading the coded scale, wherein the scanning unit includes a plurality of electrical components. The disclosed switching apparatus includes a capacitor connected in parallel with the electrical components and a switching element, such as a transistor, connected in series with the electrical components and in parallel with the capacitor. The switching element is responsive to a switching signal to selectively apply a supply voltage to and interrupt the supply voltage from the electrical components, all without charging or discharging the capacitor.

REFERENCES:
patent: 3534360 (1970-10-01), Hafle
patent: 4184071 (1980-01-01), Fryer et al.
patent: 4278969 (1981-07-01), Woods
patent: 4327362 (1982-04-01), Hoss

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