Contrast indicating arrangement in photoelectric sensing systems

Details Contrast indicating arrangement in photoelectric sensing systems Contrast indicating arrangement in photoelectric sensing systems

1984-07-05

1987-02-17

Curtis, Marshall M.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

340707, 34081531, 356228, G09G 300

Patent

active

046443410

ABSTRACT:
A photoelectric sensing system, the adjustment of which is facilitated by the incorporation therein of a contrast indicator with a display in the form of an array of light emitting diodes (LEDs) controlled by a driver circuit which is arranged for successive illumination of the LEDs, preferably on a one-to-one basis. This bargraph type instrument is also effective in photoelectric sensing tasks involving variations of the detected light between "light" and "dark" at a rapid rate, in which case the range of LEDs between these two extremes appears dimly lit at a steady glow.

REFERENCES:
patent: 2450319 (1948-09-01), Weisglas
patent: 3487263 (1969-12-01), Pahlauan
patent: 3506352 (1970-04-01), Denner
patent: 3898636 (1975-08-01), Smith

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