US Patent No. 10,409,044

ZOOM OPTICAL SYSTEM


Patent No. 10,409,044
Issue Date September 10, 2019
Title Zoom Optical System
Inventorship Jan Vilem, Vsetin (CZ)
Josef Valchar, Prostredni Becva (CZ)
Assignee Robe Lighting s.r.o., Roznov pod Radhostem (CZ)

Claim of US Patent No. 10,409,044

1. A zoom optical system comprising:a light source configured to illuminate an object located in an object plane;
a focus lens group, optically coupled to the object without intervening lenses, having a first positive optical power, comprising six lenses, and configured to move relative to the object plane to control whether an object in the object plane or in a plane adjacent to the object plane is in focus, the six lenses of the focus lens group, listed in sequence beginning with a lens closest to the object plane, comprise positive, negative, positive, positive, negative, and positive power lenses;
a zoom lens group, optically coupled to the focus lens group without intervening lenses, having a negative optical power, comprising three lenses, and configured to move relative to the object plane and the focus lens group, the zoom lens group configured to move for zooming while the focus lens group remains in a fixed position relative to the object plane for zooming, the three lenses of the zoom lens group, listed in sequence beginning with a lens closest to the object plane, comprise positive, negative, and negative power lenses; and
a fixed lens group, optically coupled to the zoom lens group without intervening lenses, having a second positive optical power, comprising three lenses, and configured to remain in a fixed position at all times relative to the object plane and to project an image of the object without intervening lenses between the fixed lens group and the image of the object, the three lenses of the fixed lens group, listed in sequence beginning with a lens closest to the object plane, comprise negative, positive, and positive power lenses.