Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Reexamination Certificate
2006-12-05
2006-12-05
Allen, Stephone B. (Department: 2878)
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
C250S216000, C359S641000
Reexamination Certificate
active
07145129
ABSTRACT:
An unsealed optical encoder does not function properly in a fluid other than air because the optics do not function when interfaced with a medium having an index of refraction significantly higher than air. The collimating lens of an optical encoder has two refracting surfaces, at least one of the refracting surfaces being convex. An orthogonal cap of the present invention is attached over an optical encoder's collimating lens to create a sealed air cavity between the convex refracting surface of the collimating lens and the orthogonal cap. This placement of the orthogonal cap is such that the collimated light leaving the sealed air cavity may enter the surrounding medium at an angle that is normal to the surface of the medium, such as transparent oil, so that the collimated light does not bend even though the light is traveling from air to a much slower medium.
REFERENCES:
patent: 4385234 (1983-05-01), Johnson
Gojevic Stephen M
Kitchens Jack C
Schneider John K
Allen Stephone B.
Hodgson & Russ LLP
Lee Patrick J.
Ultra-Scan Corporation
LandOfFree
Method for optimizing performance of optical encoders... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method for optimizing performance of optical encoders..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method for optimizing performance of optical encoders... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3715956