Apparatus for locating inter-pupilary of nose bridge mounted spectacles to lens meter
US4098002A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 13, 1977 |
| Grant date | Jul 4, 1978 |
| Priority date | — |
| Expiry date | Jun 13, 1997 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02C13/005
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
In combination with a lens meter for measuring along a single optical path the power of suspect optics, an apparatus for positioning nose bridge mounted spectacles is disclosed. At least one nose locator piece simulating the shape and location of the human nose is mounted for sliding movement on a bar. A bar locks vertical lens movement on the base of the lens frame at the bottom of the lenses to establish the elevation of the visual center on each lens for each eye. The transverse spacing of the nose locator piece locates the remaining coordinate of the visual center of the suspect lens. The nose locator piece, when registered to the spectacles at the nose bridge, is read through an attached and typically magnified scale to indicate nose bridge to visual center distance. By using paired nose locator pieces and paired scales, rapid measurement of nose frame mounted spectacles can occur at the spaced visual centers for the right and left eye lens to a lens meter having a monocular light path. The bar locking vertical lens movement preferably includes a pressure sensitive portion to indicate a positioned lens for measurement as well as to provide identification (left or right suspect…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.