Patent · US Expired

Light enhancement camera attachment

US4204761A · kind A · utility

5Cited by
7References
10Claims
0Family size

Inventor

Key dates

Filing dateJan 15, 1979
Grant dateMay 27, 1980
Priority date—
Expiry dateJan 15, 1999

Classification

  • Technology area (CPC G)Physics
  • CPC primaryG03B17/12
  • WIPO fieldOptics
  • WIPO sectorInstruments

Abstract

A camera attachment for providing a low level of diffuse light over a photographic film. This illumination occurs at the time of the exposure of the film. The process may be termed "flashing" and the effect is to make the film more sensitive to light. The attachment comprises an edge-illuminated transparent disc disposed directly in front of a large aperture photographic lens. An additional annular transparent element may surround the disc. "Softness" for portraiture can also be accomplished.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.