Zoom camera obscura
US6408136B1 · kind B1 · utility
Inventor
Key dates
| Filing date | Nov 28, 2000 |
| Grant date | Jun 18, 2002 |
| Priority date | — |
| Expiry date | Nov 29, 2020 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B17/00
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A portable zoom camera obscura comprising: a telescopic structure including an inner tube and an outer tube positioned concentrically and slidingly movable relative to each other; a cover with a small, centered imaging hole attached to the imaging end of the outer tube; a semitransparent screen covering the inner end of the inner tube; a cover having a viewing hole and attached to the viewing end of the inner tube; and a diaphragm disk or ruler mounted on the imaging end, and including an aperture which can be positioned in a series of continuous overlapping positions with the imaging hole. The diaphragm disk or ruler also include lenses with different focal lengths, which, when positioned in front of the imaging hole allow the camera obscura to function as a photo-camera.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.