Display device with photoelectric sensing of unevenly spaced mar

Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system

Patent

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Details

340825, G01D 534

Patent

active

051719827

ABSTRACT:
For a display device with scale (4), pointer (5), stepping motor (1), gearing (2) and control means (7) in which a plurality of revolutions of the stepping motor (1) corresponds to the entire display range and the control means (7) contains a step counter with reversibly unambiguous association of number of steps and display value, a possibility for the continuous adjustment of the step counter (1) with the actual pointer position is created by a coding disk (3) which is connected, fixed for rotation, with the shaft (6) of the pointer (6). The disk has a number of markings (9) arranged at different distances apart on its periphery and having a sensor (8). By a comparison of the actual number of steps with a reference number of steps stored in a table for each of the markings (9), it can be determined whether the association between number of steps and pointer position is correct or must be readjusted.

REFERENCES:
patent: 3982106 (1976-09-01), Stutz
patent: 4037219 (1977-07-01), Lewis
patent: 4326415 (1982-04-01), Lee
patent: 4560983 (1985-12-01), Williams

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