High numerical aperture objective lens assembly
AssigneeEastman Kodak Company
InventorCarl F. Leidig
Life of this patent
Estimating the term…
Abstract
A high numerical aperture objective lens assembly for focusing light includes a first objective lens assembly element of negative optical power intercepting said light; a second objective lens assembly element of positive optical power disposed adjacent to said first objective lens assembly element; a third objective lens assembly element of positive optical power disposed adjacent to said second objective lens assembly element; and wherein said first, second, and third objective lens assembly elements, in combination, include six surfaces wherein three or more of such surfaces are aspheric surfaces arranged so that the objective lens assembly has a numerical aperture equal to or greater than 0.65.
Claims15
A high numerical aperture objective lens assembly for focusing light, comprising:
- a) a first objective lens assembly element of negative optical power intercepting said light;
- b) a second objective lens assembly element of positive optical power disposed adjacent to said first objective lens assembly element;
- c) a third objective lens assembly element of positive optical power disposed adjacent to said second objective lens assembly element;
- and
- d) wherein said first, second, and third objective lens assembly elements, in combination, include six surfaces wherein three or more of such surfaces are aspheric surfaces arranged so that the objective lens assembly has a numerical aperture equal to or greater than 0.65.
An optical recording or reading device, comprising:
- a) a source of light;
- and
- b) an optical lens assembly for focusing light on a surface for reading or recording including:
- i) a first objective lens assembly element of negative optical power intercepting said light;
- ii) a second objective lens assembly element of positive optical power disposed adjacent to said first objective lens assembly element;
- iii) a third objective lens assembly element of positive optical power disposed adjacent to said second objective lens assembly element;
- and
- iv) wherein said first, second, and third objective lens assembly elements, in combination, include six surfaces wherein three or more of such surfaces are aspheric surfaces arranged so that the objective lens assembly has a numerical aperture equal to or greater than 0.65.
Dependencies are inferred from the claim text.