Encoder having electrode pattern with pairs of...

Details Encoder having electrode pattern with pairs of... Encoder having electrode pattern with pairs of...

2005-09-20

2005-09-20

Jeanglaude, Jean Bruner (Department: 2819)

Coded data generation or conversion

Digital pattern reading type converter

Having combined coding pattern

Reexamination Certificate

active

06946979

ABSTRACT:
An encoder includes a rotary member having a predetermined electrode pattern and a fixed member having multiple channel contacts which are opposed to the electrode. The rotary member has stable reference phases where at most one pair of the contacts is ON (in electrical contact) and at least another pair is OFF (not in electrical contact), i.e. both pairs may be OFF. When the rotary member is rotated clockwise or counter-clockwise from one reference phase, both pairs of contacts are temporarily on before reaching the adjacent reference phase. The pairs of contacts that are ON or OFF at the adjacent reference phase differ dependent on the direction of rotation. A counter is incremented or decremented according to the direction of rotation.

REFERENCES:
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patent: 3188627 (1965-06-01), Webb et al.
patent: 3202982 (1965-08-01), Whitney
patent: 3206738 (1965-09-01), Wayman
patent: 3213443 (1965-10-01), Lancaster et al.
patent: 3449588 (1969-06-01), Foskett
patent: 4899145 (1990-02-01), Okuda et al.
patent: 4949087 (1990-08-01), Miyazawa
patent: 5237237 (1993-08-01), Ueda et al.
patent: 2506877 (1996-04-01), None

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