| US 7,616,393 B2 | ||
| Compact folded thin lens | ||
| John N. Border, Walworth, N.Y. (US); Joseph R. Bietry, Rochester, N.Y. (US); and John T. Compton, LeRoy, N.Y. (US) | ||
| Assigned to Eastman Kodak Company, Rochester, N.Y. (US) | ||
| Filed on Dec. 20, 2007, as Appl. No. 11/961,038. | ||
| Prior Publication US 2009/0161235 A1, Jun. 25, 2009 | ||
| Int. Cl. G02B 5/04 (2006.01) | ||
| U.S. Cl. 359—834 [359/837] | 8 Claims |
| 1. A thin lens comprising:
a first optical element comprising:
a first refracting surface, wherein incoming light passes through the first refracting surface on a first optical axis;
a reflecting surface for changing a direction of the incoming light from the first optical axis to a second optical axis;
a second refracting surface, wherein the incoming light on the second optical axis passes through the second refracting surface;
a second optical element comprising:
a first refracting surface, wherein incoming light passes through the first refracting surface on the second optical axis;
a reflecting surface for changing a direction of the incoming light from the second optical axis to a third optical axis;
a second refracting surface, wherein the incoming light on the third optical axis passes through the second refracting surface;
the third optical axis is approximately parallel to and in an opposite direction from the first optical axis;
the first optical element and the second optical element are solid optical material; and
wherein the first optical element has positive optical power and a first dispersion, and the second optical element has a
negative optical power and a second dispersion.
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