Optical: systems and elements – Lens – With field curvature shaping
Patent
1996-07-29
1998-06-30
Pham, Hoa Q.
Optical: systems and elements
Lens
With field curvature shaping
359799, 362 32, 362106, 362268, 362804, 600249, G02B 300, F21V 704
Patent
active
057742715
ABSTRACT:
A lamp assembly includes a condensing lens group disposed at one end for collecting and collimating a light from a light source, an exit lens group at the other end of the assembly, including at least one objective lens element for projecting an illuminated light spot at a predetermined distance, and an iris disposed between the condenser lens group and the exit lens group having a variable opening for varying the size of the illuminated light spot between a minimum and a maximum spot diameter at the predetermined distance. The invention allows the illuminated light spot to be focused for at least two separate iris positions at the predetermined distance by allowing relative movement between the objective lens element and the iris to provide enhanced edge definition and illumination uniformity.
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Lagerway William H.
Perkins Jeffrey
Slawson Steven R.
Pham Hoa Q.
Welch Allyn Inc.
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