Patent ID: 7616393
Filing Date: 2009-11-10
Classification: G02B

Abstract:
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.