Optics: eye examining – vision testing and correcting – Eye examining or testing instrument – Objective type
Reexamination Certificate
2007-02-27
2009-11-03
Hasan, Mohammed (Department: 2873)
Optics: eye examining, vision testing and correcting
Eye examining or testing instrument
Objective type
C351S221000
Reexamination Certificate
active
07611245
ABSTRACT:
A placido projector for a corneal topography system includes a substrate having dielectric phosphor. The substrate is configured to be activated by electric current and responsive to emit light. A plurality of opaque, concentric rings are formed on the substrate. When the substrate emits light responsive to the electric current, a placido image is projected. The concentric rings can be formed using silk screening or other techniques. The dielectric phosphor can be micro-encapsulated and deposited onto the substrate. The substrate may be an electro-luminance panel. A protective cover is placed adjacent to the substrate to retain the substrate in a predetermined shape. In one embodiment, the placido projector has a frusto conical shape.
REFERENCES:
patent: 4995716 (1991-02-01), Warnicki et al.
patent: 6152565 (2000-11-01), Liu et al.
patent: 6315413 (2001-11-01), Shimmick et al.
patent: 6547393 (2003-04-01), Ruiz
patent: 6572230 (2003-06-01), Levine
EyeSys Vision, Inc.
Gardere Wynne & Sewell LLP
Hasan Mohammed
Perque Chris P.
LandOfFree
Placido projector for corneal topography system does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Placido projector for corneal topography system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Placido projector for corneal topography system will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-4129018