Performing quadrature and push button function utilizing two IR

Details Performing quadrature and push button function utilizing two IR Performing quadrature and push button function utilizing two IR

1997-11-05

1999-10-12

Allen, Stephone

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250221, 250214PR, 340555, G01D 534

Patent

active

059658789

ABSTRACT:
A selector assembly for use in avionic multifunctional displays to perform quadrature and push button functions is described herein. The selector assembly utilizes two sensors and a cylindrical band with an encoder pattern having three distinct zones to sense either direction of rotation (quadrature) of a knob or its push motion. The pattern can include regions that are absorptive and reflective to infrared (IR) energy. The selector assembly uses the two sensors to sense a pattern rotation or a push motion of the pattern, thereby reducing the number of mechanical and sensing components and simplifying the wiring associated with the assembly. The encoder pattern is molded either directly on the inside of the knob or on a label that is adhered to the interior surface of the knob. The physical components and the sensors of the encoder mechanism are also placed within the knob of the selector assembly, thereby optimizing the useable glass surface area available for avionic displays.

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