Patent Leaderboard
USPTO Patent Rankings Data through Dec 31, 2025
Home › Field stop for dark field illumination in autofocus optical device

Field stop for dark field illumination in autofocus optical device

US Patent 4798948 · Granted Jan 17, 1989

Assignee

Inventors

View full patent text on Google Patents →

More Patents by These Inventors

Transducer for generating optical contrasts2004
Variable epi-illumination interference attachment2003
Condenser system for microscopes1999
Process and device for contrasting objects to be microscopically examined1998
Illumination device for microscopes1997
Bright-field transmitted-light lighting device for microscopes1996
Epi-illumination system for microscopes1996
Spectral microscope with a photometer1992
Apparatus for producing an optical image contrast1990
Apparatus for automatically focusing objects to be viewed in optical instruments1986
Incident light, bright-field Kohler illuminating device1983