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US 2009/0153801 A1Published application
Light Projection Target Mire For Curvature Measurements
OwnerLiliane Ventura, Cassius Riulinventors
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OwnerLiliane Ventura, Cassius Riulinventors
Estimating the term…
The present invention refers to the light ring target mire (8) used for accurate measuring of the radii of curvature of spherical and non spherical reflective surfaces, with a fixation target for the patient, holes that allow the observation by the slit lamp (7), holes to be illuminated (4), using an illumination system composed by a header which has an exit lens from the illumination system, focused filament, an intermediary circle and a light stop with an useful area for the target mire, being alternatively projected with arc shaped rings, or passing through rings in a precise circumlinear shape, allowing to be used with different types of illumination systems, providing measurements of any reflective surface, not being limited to ocular exams.
1) “LIGHT PROJECTION TARGET MIRE FOR ACCURATE MEASUREMENTS OF THE RADII OF CURVATURE OF SPHERICAL AND NON SPHERICAL REFLECTING SURFACES”, characterized by a device, light ring target, used for precise measurements of the radii of curvature or reflective surfaces of any shape, having 72 holes, more than or less than, for light projection and two additional holes that allow the observation through the eyepieces of the slit lamp or any other ocular microscope or any other device to which the target may be attached, externally illuminated by a light or any other type of illumination, in particular, for the slit lamp that has an illumination system composed by header which has a light bulb, an exit lens from the illumination system, focused filament, an intermediary circle and a light stop with an useful area for the target mire, being alternatively projected with arc shaped rings, or passing through rings in a precise circumlinear shape, allowing to be used with different types of illumination systems, providing measurements of any reflective surface, not being limited to ocular exams.
5) “LIGHT PROJECTION TARGET MIRE FOR ACCURATE MEASUREMENTS OF THE RADII OF CURVATURE OF SPHERICAL AND NON SPHERICAL REFLECTING SURFACES”, according to claims 1, 2, 3, 4 and 5, is characterized by the geometric calculus considering the rays coming from the intermediary circle, that reach the central parts of the reflective surfaces in order to reflect the light rays that come from the useful parts on surfaces 2 and 3 (reflection angle is the same as the incidence angle-reflection law) and to reach surface 4 at reflective angle α at surface 2, and at reflective angle β on surface 3, by the reflection law, will be reflected at the same incidence angle and defining distance “d” and the image size 2h between the incidence points 2 and 3, angles α, β and σ are obtained by the equations (1), (2), (3), (4), (5) and (6):
Dependencies are inferred from the claim text.