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AssigneeEssilor International
InventorJean-Claude Hennequin
Estimating the term…
The invention concerns a process and device for the positioning of an optical measuring instrument and a spectacle frame in relation to each other. The practitioner, operating from a position roughly determined by the point at which the two optical paths converge adjusts the relative position of the spectacle frame and measuring instrument so that the reflection of the side edge of the frame in a semi-transparent mirror located on each side of the device appears directly over the actual image of an alignment mark behind the mirror. This convergence indicates that the frame is in the correct position in relation to the measuring instrument.
A process for positioning an optical measuring instrument comprising a positioning device and a spectacle frame in relation to each other, wherein two positioning marks on the device are arranged in such a way as to define a reference plane, and that the positioning device and spectacle frame are moved into a position in which the reference plane and mean plane of the frame are in a given position in relation to each other, and by the fact that a semi-transparent mirror is placed between the frame and each of the positioning marks, each such mirror, separated from the other mirror, being placed symmetrically in relation to a median plane of symmetry at right angles to the reference plane, and forming a plane bisecting the angle formed by the mirrors, and by the fact that the positioning marks are observed from a point on this bisecting plane, and that the device and frame are moved in relation to each other until the reflection of the side outline of the frame in each of the mirrors coincides with the relevant positioning mark visible through each mirror.
Dependencies are inferred from the claim text.