US 12,345,390 B2
Optical system for an automated luminaire
Michal Stanek, Valasske Mezirici (CZ); Jan Vilem, Valasske Mezirici (CZ); Tomas David, Podoli (CZ); Jindrich Vavrik, Zubri (CZ); and Josef Valchar, Prostredni Becva (CZ)
Assigned to ROBE lighting s.r.o., Roznov pod Radhostem (CZ)
Filed by ROBE lighting s.r.o., Roznov pod Radhostem (CZ)
Filed on Aug. 9, 2024, as Appl. No. 18/799,778.
Claims priority of provisional application 63/579,734, filed on Aug. 30, 2023.
Prior Publication US 2024/0401778 A1, Dec. 5, 2024
Int. Cl. G02B 15/14 (2006.01); F21V 5/00 (2018.01); F21V 5/04 (2006.01); F21V 14/02 (2006.01); F21V 14/06 (2006.01); F21W 131/406 (2006.01); F21Y 107/10 (2016.01); F21Y 113/00 (2016.01); F21Y 115/10 (2016.01)
CPC F21V 14/02 (2013.01) [F21V 5/008 (2013.01); F21V 5/048 (2013.01); F21V 14/06 (2013.01); F21W 2131/406 (2013.01); F21Y 2107/10 (2016.08); F21Y 2113/00 (2013.01); F21Y 2115/10 (2016.08); G02B 15/143105 (2019.08)] 14 Claims
OG exemplary drawing
 
1. A zoom optical system comprising:
a light source configured to illuminate an object located in an object plane of the zoom optical system or in a plane adjacent to the object plane;
a focus lens group optically coupled to the object without intervening lenses, the focus lens group having a first positive optical power and configured to move relative to the object plane to control whether the object is in focus, the focus lens group comprising four lenses, the four lenses comprising positive, positive, positive, and negative optical power lenses, listed in sequence beginning with a lens of the focus lens group closest to the object plane;
a zoom lens group optically coupled to the focus lens group without intervening lenses, the zoom lens group having a negative optical power and configured to move relative to the object plane and the focus lens group, the zoom lens group configured to move to control a beam angle while the focus lens group remains in a fixed position relative to the object plane, the zoom lens group comprising two lenses, both lenses comprising negative power lenses; and
a fixed lens group, optically coupled to the zoom lens group without intervening lenses, the fixed lens group having a second positive optical power, and configured to remain in a fixed position relative to the object plane and to project an image of the object, the fixed lens group comprising three lenses, the three lenses comprising negative, positive, and positive optical power lenses, listed in sequence beginning with a lens of the fixed lens group closest to the object plane.