Patent · US Expired

Method and apparatus for determining the optical properties of a lens

US5301004A · kind A · utility

17Cited by
4References
56Claims
0Family size

Assignee

Inventors

Key dates

Filing dateMar 13, 1992
Grant dateApr 5, 1994
Priority date—
Expiry dateMar 13, 2012

Classification

  • Technology area (CPC G)Physics
  • CPC primaryG01M11/0235
  • WIPO fieldMeasurement
  • WIPO sectorInstruments

Abstract

Optical properties of a lens, including localized defects, are determined by analyzing the refracted image produced by transmitting a beam of light through an aperture and a lens to be tested. The image is reflected onto a light sensitive detecting surface. Information obtained from the light detecting surface is digitized and sent to an Image Processing Unit which calculates the optical properties of the lens. The aperture may consist of a single shaped opening or alternatively a plurality of concentric, annular rings. Correction lenses may be employed, either permanently or selectively, to alter the refracted beam before the beam intersects the detecting surface.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.