Lens meter
US5886779A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 29, 1998 |
| Grant date | Mar 23, 1999 |
| Priority date | — |
| Expiry date | Jun 29, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01M11/0228
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A lens meter comprising light sources for project luminous flux for measurement to a lens to be examined and a light receiving element for detecting the measuring luminous flux passed through the lens to be examined, wherein refractive characteristics of the lens is detected on the basis of the examined data by the light receiving element, the lens meter comprises a measurement target having predetermined patterns, device for moving the target to one of a plurality of arrangement positions on the optical path of the measuring luminous flux, device for selecting one position to which the measurement target is to be moved among a plurality of arrangement positions on the optical path on the basis of the examined data by the light receiving element, device for controlling the target moving device in accordance with the selection by the selecting device.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.