Optical encoding that utilizes total internal reflection

Details Optical encoding that utilizes total internal reflection Optical encoding that utilizes total internal reflection

2006-12-05

2006-12-05

Epps, Georgia (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

C250S231140, C250S216000, C341S011000

Reexamination Certificate

active

07145127

ABSTRACT:
A coding element such as a codewheel includes first and second surfaces that are configured with respect to each other and with respect to a light beam such that the light beam is reflected at the two surfaces using the optical phenomenon of total internal reflection. The coding element also includes a coding pattern that is aligned in an optical path of the light beam after the light beam has reflected off of both of the surfaces. A coding element with surfaces that reflect a light beam as a result of total internal reflection can be utilized in an encoding system that operates in transmission while the light source and the photodetector array are located on the same side of the coding element.

REFERENCES:
patent: 4451731 (1984-05-01), Leonard
patent: 4691101 (1987-09-01), Leonard
patent: 5241172 (1993-08-01), Lugaresi
patent: 6278107 (2001-08-01), Gaumet
patent: 6995356 (2006-02-01), Chong et al.

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