Dual focus optical system
US4566762A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 29, 1983 |
| Grant date | Jan 28, 1986 |
| Priority date | — |
| Expiry date | Aug 29, 2003 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B27/283
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A dual focus optical system for causing the images of two objects separate from each other on the optical axis to be formed on the same image plane comprises a diverging element for causing a second light ray to diverge relative to a first light ray, a converging element provided on the object side of the diverging element for converging the second light ray relative to the first light ray, and an objective lens provided on the object side of the two elements for converging both of the first light ray and the second light ray. The objective lens is disposed so that the point of intersection between the first light ray and the second light ray in the composite system comprising the diverging element and the converging element is coincident with the focal plane of the objective lens which is adjacent to the converging element.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.