Optical device for precision work
US4886340A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 11, 1988 |
| Grant date | Dec 12, 1989 |
| Priority date | — |
| Expiry date | Jul 11, 2008 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02C9/02
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An optical device comprising a wearing member to be attached to the body of the user, a first lens holder provided on the wearing member and having attached thereto a pair of eyepiece concave lenses as spaced apart by an adjustable distance, and a second lens holder connected to the wearing member or to the first lens holder and having attached thereto a pair of objective convex lenses as spaced apart by an adjustable distance. Accordingly, the distance between the eyepiece concave lenses and the distance between the objective convex lenses are adjustable each independently of the other to position the optical center of each lens accurately on the visual axis of the corresponding eye of the user.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.