Bravais lens
AssigneeEastman Kodak Company
InventorJohn D. Griffith
Life of this patent
Estimating the term…
Abstract
A Bravais lens includes a front, positive power lens group and a rear, negative power lens group. These lens groups, in combination, provide the Bravais lens with a negative focal length and a negative power. The front, positive power lens group includes a positive power lens element and a negative power lens element. The rear, negative power lens group includes another negative power lens element and another positive power lens element.
Claims14
A Bravais lens comprising:
- (i) a front, positive power lens group including a positive power lens element and a negative power lens element;
- and
- (ii) a rear, negative power lens group accepting light from said front, positive power lens group and including another negative power lens element and another positive power lens element, wherein said front, positive power lens group in combination with said rear, negative power lens group provide said Bravais lens with a negative focal length and a negative power.
A Bravais lens comprising in order:
- (i) a first, positive power lens group including a first positive power lens element followed by a first negative power lens element;
- and
- (ii) a second, negative power lens group accepting light from said first, positive power lens group, said second, negative power lens group including a second negative power lens element facing said first negative power lens element of said first lens group and a second positive power lens element facing said second negative power lens element of said second lens group of said Bravais lens.
A Bravais lens comprising at least three lens elements, said lens elements including at least one positive power lens element and at least one negative power lens element, at least one of said lens element having an anomalous partial dispersion rendering said Bravais lens apochromatic.
A Bravais lens consisting:
- (i) a front, positive power lens group including a first positive power lens element and a first negative power lens element;
- (ii) a rear, negative power lens group accepting light from said front, positive power lens group and including a second negative power lens element and a second positive power lens element;
- and
- said front, positive power lens group in combination with said rear, negative power lens group providing said Bravais lens with negative focal length and power.
Dependencies are inferred from the claim text.