1
William H Lagerway, David G Perkins, William M Wrisley, Ronald A Hauptli: Objective lens system for imaging instrument. Welch Allyn, Wall Marjama & Bilinski, November 7, 2000: US06142934 (42 worldwide citation)

A retrofocus objective lens system which is conducive for an otoscope includes a first group of optical elements positioned at a distal portion and a second group of optical elements proximally spaced from the first group of optical elements. The first group of optical elements includes at least one ...


2
Lagerway William H, Perkins David G, Wrisley William M, Hauptli Ronald A: Objective lens system for imaging instrument. Welch Allyn, BILINSKI Peter J, August 26, 1999: WO/1999/042760

A retro-focus objective lens system (12) which is conducive for an otoscope includes a first group of optical elements (40) positioned at a distal portion, and a second group of optical elements (52, 58, 60) proximally spaced from the first group of optical elements. The first group of optical eleme ...