Patent ID: 11860345
Assignee: BAE SYSTEMS INFORMATION AND ELECTRONIC SYSTEMS INTEGRATION INC.
Field: Optics (Instruments)
Classification: CPC G | IPC G

Claim 16:
17. A discrete zoom lens, with a plurality of elements arranged in order from a remote object to an image plane, comprising:
a scanning mirror;
a first group with an interchangeable first or second configuration, comprising:
if in a first configuration, a first changeable optical group having a positive optical power; and
if in a second configuration, a second changeable optical group having a positive optical power;

a fold mirror;
a second group having a positive optical power, comprising:
a first element having a positive optical power and made in a form of a double convex lens;
a second element having a positive optical power and made in a form of a positive meniscus lens whose concave surface faces toward the image;
a third element having a negative optical power and made in a form of negative meniscus lens whose concave surface faces toward the image;
a fourth element having a positive optical power and made in a form of a positive meniscus lens whose concave surface faces toward the remote object;
a fifth element having a negative optical power and made in a form of negative meniscus lens whose concave surface faces toward the remote object;
a sixth element having a positive optical power and made in a form of a positive meniscus lens whose concave surface faces toward the remote object;
a seventh element having a positive optical power and made in a form of a positive meniscus lens whose concave surface faces toward the image; and
an eighth element having a positive optical power and made in a form of a positive meniscus lens whose concave surface faces toward the remote object;

an aperture stop; and
a focal plane array.