Focusing glass and photographic system
US5802406A · kind A · utility
3Cited by
3References
10Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 18, 1997 |
| Grant date | Sep 1, 1998 |
| Priority date | — |
| Expiry date | Feb 18, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B13/24
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A focusing glass and photographic system employing the same are disclosed. The photographic system includes an objective lens operable to form a real image of an object. The focusing glass is adapted to be situated at the real-image position, and comprises a semitransparent region surrounding a fully transmissive photographic zone. The photographic zone defines a region of the field of view of the objective (the field of view being viewable on the focusing screen) defining the metes and bounds of a photographic image obtainable using the photographic system.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.