The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 27, 2010
Filed:
Aug. 02, 2007
Kathrin Keller, Lahnau, DE;
Uwe Reinstädtler, Fernwald, DE;
Kathrin Keller, Lahnau, DE;
Uwe Reinstädtler, Fernwald, DE;
Leica Camera AG, Solms, DE;
Abstract
Described is a wide-angle slip-on viewfinder () on rangefinder cameras for analog and digital wide-angle recordings of different image recording formats with lenses of different focal lengths, comprising three lens groups (LG, LG, LG), a frame/mask unit () and a partially transmissive prism cube () which is designed as a combination element, wherein, on the light entrance side () in the viewfinder beam path (), a first lens group (LG) has a negative refractive power and the second and third lens groups (LG, LG) have a positive refractive power, wherein the second lens group (LG) is composed of a first lens (L) arranged downstream of the first lens group (LG) and a second lens (L) arranged on the light exit side () and the partially transmissive prism cube () is arranged between the lenses (L, L) and the third lens group (LG) is arranged in a mask imaging beam path () which is at right angles to the viewfinder beam path () between the frame/mask unit () and the partially transmissive prism cube ().