Lens, lens unit, and imaging device using the same
AssigneePanasonic Corporation
InventorsHiroshi Nishizawa, Makoto Imai
Life of this patent
Estimating the term…
Abstract
A lens is provided which is configured so that the dimensional accuracy of the lens surface can be evaluated easily and accurately, and the control of the accuracy of the lens can be easily performed. The lens comprises a lens effective part having lens surfaces formed around an optical axis as the center and an edge part in a doughnut shape as viewed in a plan view, which is extended along the outer periphery of the lens effective part. The edge part and the lens effective part are molded simultaneously, and annular indices around the optical axis as the center, with which the dimensional accuracy of the lens surfaces can be detected, are formed on both the surfaces of the edge part.
Claims15
A lens comprising:
- a lens effective part having lens surfaces formed around an optical axis as the center;
- and
- an edge part in a doughnut shape as viewed in a plan view, which is extended along an outer periphery of the lens effective part,
- wherein the edge part and the lens effective part are molded simultaneously,
- on both surfaces of the edge part that are a first surface and a second surface, annular indices around the optical axis as the center are formed, with which dimensional accuracies of the lens surfaces can be detected,
- the annular index formed on the first surface and the annular index formed on the second surface have different diameters, and
- eccentricity in excess of an eccentricity tolerance occurring to the lens surfaces can be detected from an overlapping of the indices.
Dependencies are inferred from the claim text.