Optics: measuring and testing – Lens or reflective image former testing – Focal length measuring
Patent
1980-07-29
1983-01-25
Arnold, Bruce Y.
Optics: measuring and testing
Lens or reflective image former testing
Focal length measuring
G01B 900
Patent
active
043700586
ABSTRACT:
The invention contemplates a method and apparatus for automatically performing digital measurement of vertex dioptric powers in the principal planes of toric spectacle lenses. A spectacle lens is transilluminated by a parallel-ray bundle of monochromatic light which, after passage through the spectacle lens, is limited by an annular stop in the immediate vicinity of the vertex of the spectacle lens. A beamsplitter divides the light which passes through the spectacle lens into two individual light beams. As a result, an elliptical figure is projected to two planes, in each of which is located at least one self-scanning diode line. Diode-line scanning develops intercepts of the projected elliptical figure, and from the positional locations of these intercepts (in relation to the local intercept of the optical axis) a computer performs a selected one of a plurality of evaluation procedures (a) to develop projected-figure reorientation or displacement as necessary to permit it then (b) to perform a desired measurement evaluation. Provision is made for automatic detection of whether a given spectacle lens is or is not within the currently set range of measurement capability and, if determined to be outside such range, the fact of such detection is operative to change optical elements of the apparatus for optimum measurement-range accommodation of the particular spectacle lens.
REFERENCES:
patent: 4007990 (1977-02-01), McDevitt, Jr. et al.
patent: 4102575 (1978-07-01), Lapornik et al.
patent: 4139305 (1979-02-01), Lapornik
patent: 4275964 (1981-06-01), Vassiliadis
Machler Meinrad
Stacklies Horst
Trotscher Otto
Arnold Bruce Y.
Carl Zeiss-Stiftung
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