Apparatus and method for detecting hidden marks on progressive a

Details Apparatus and method for detecting hidden marks on progressive a Apparatus and method for detecting hidden marks on progressive a

1990-11-05

1992-03-31

Rosenberger, Richard A.

Optics: measuring and testing

Lens or reflective image former testing

For optical transfer function

G01B 900

Patent

active

051002329

ABSTRACT:
A device for detecting hidden marks on progressive aspheric ophthalmic lens is disclosed. The device includes a housing, a light source within the housing, a magnifying lens mounted above the housing and a target element mounted within the housing between the light source and the magnifying lens. A progressive aspheric ophthalmic lens is supported by the housing at a position between the target element and the magnifying lens. A light beam is directed from the light source through the target element, the ophthalmic lens and the magnifying lens. The ophthalmic lens is then visually inspected through the magnifying lens against a background provided by the target element to detect the hidden marks.

REFERENCES:
patent: 2107553 (1938-02-01), Tillyer
patent: 3332320 (1967-07-01), Lueck
patent: 4039827 (1977-08-01), Zdrok et al.
patent: 4194814 (1980-03-01), Fischer et al.
patent: 4564291 (1986-01-01), Yoshino et al.

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