Lensmeter utilizing non-parallel light
US4182572A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 5, 1977 |
| Grant date | Jan 8, 1980 |
| Priority date | — |
| Expiry date | Jul 5, 1997 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01M11/0228
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A unitary light source is imaged through a prism array to generate a plurality of preferably four apparent light sources forming a point of origin for a discrete lens sampling light path. From each apparent light source, each discrete sampling path diverges to a relay lens system. This relay lens system relays and registers to a lens sampling interval discrete images of each apparent light source. The images may be registered to a correspondingly apertured lens sampling diaphragm against which suspect optics are placed for measurement. A moving boundary locus sweeps the light between each apparent source and the sampling interval with paired boundaries of differing slopes which produce non-ambiguous points of intersection with respect to time. After passage through the suspect optics at the sampling interval, light is passed to a photodetector having an overlying set of apertures, each aperture corresponding to one of the four apparent light sources. A lens pair functions as relay optics to focus a conjugate image of the light at the suspect optics to the overlying apertures at the detector. Light other than that passing through the suspect optics at the point of the images of the …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.