Zero mark for optical encoder using stator mask patterns and rot

Details Zero mark for optical encoder using stator mask patterns and rot Zero mark for optical encoder using stator mask patterns and rot

1990-04-20

1991-11-12

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250237G, 356395, G01D 534

Patent

active

050650173

ABSTRACT:
An incremental position encoder makes use of a first and second track of non-identical non-complementary aperiodic patterns to generate a zero mark. A mask with the identical pattern to the first track and a mask with the complementary pattern to the second track correlate with the patterns on the first and second track when the encoder is in zero position. Light transmitted by the masks produce electrical signals that are compared to create the zero mark. An iterative approach improves the discrimination of an initially selected track pattern for its particular application based on developed criteria for good noise immunity and resoltuion. The size of the reference track with respect to the increment track and the placement of each mask on the stator and rotor are optimized. A system for improving noise immunity by biasing the signal from each photodetector is also shown.

REFERENCES:
patent: 3187187 (1965-06-01), Wingate
patent: 3671755 (1972-06-01), Horius
patent: 3749925 (1973-07-01), Hertrich
patent: 3995156 (1976-11-01), Angersbach et al.
patent: 4263506 (1981-04-01), Epstein
patent: 4451731 (1984-05-01), Leonard
patent: 4602155 (1986-07-01), LaPlante
patent: 4670737 (1987-06-01), Rilling
patent: 4678908 (1987-07-01), LaPlante
patent: 4717824 (1988-01-01), Sakamoto et al.
patent: 4736187 (1988-04-01), Kibrick et al.
patent: 4900924 (1990-02-01), Masuda et al.

Affiliated with

Also associated with

Rating

Zero mark for optical encoder using stator mask patterns and rot does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Zero mark for optical encoder using stator mask patterns and rot, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Zero mark for optical encoder using stator mask patterns and rot will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1014443