Optics: measuring and testing – Lens or reflective image former testing – For optical transfer function
Patent
1989-11-13
1991-10-22
Rosenberger, Richard A.
Optics: measuring and testing
Lens or reflective image former testing
For optical transfer function
356125, G01B 900
Patent
active
050590227
ABSTRACT:
A device for measuring the radius of curvature of an optical element comprises a point light source or a pinhole, a beam splitter, an imaging optical system for forming a point image, an attaching member for a substance to be tested which is placed on an optical axis of the imaging optical system, a displacing mechanism for changing relative position on the optical axis of the point image, a light receiving element for detecting the point image, a prism for splitting the pupil by four comprising four wedge prisms having wholly different wedge directions and arranged between the light receiving element and the beam splitter, an image instrumentation section for detecting respective barycenter or center positions of four point images formed on the light receiving element and for calculating the displaced amount or the amount proportional to displacing differences of the point image from the reference image plane, and a display section for displaying the calculated result.
REFERENCES:
patent: 4609287 (1986-09-01), Kohayakawa
patent: 4637720 (1987-01-01), Shirayanagi et al.
patent: 4826315 (1989-05-01), Kohayakawa
Adams Bruce L.
Olympus Optical Company Limited
Pham Hoa
Rosenberger Richard A.
Wilks Van C.
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