Patent ID: 9703204
Date: 2017-07-11
CPC Classifications: G02B,G03F

Claim:
1. An optical apparatus used for illuminating a first area with light from a light source, the first area being longer in a second direction intersecting a first direction than in the first direction, the optical apparatus comprising: a collector optical member that condenses the light from the light source; a first fly's eye optical member which is provided with a plurality of first optical elements aligned in a first alignment plane in an optical path between the collector optical member and the first area; and a second fly's eye optical member which is provided with a plurality of second optical elements aligned in a second alignment plane in an optical path between the first fly's eye optical member and the first area, wherein the plurality of first optical elements in the first fly's eye optical member each have a profile longer in a fourth direction intersecting a third direction than in the third direction, all of the plurality of first optical elements form an aggregate having a first length in the third direction and all of the plurality of first optical elements form the aggregate having a second length in the fourth direction, the second length being longer than the first length, and the collector optical member forms an illumination area, which is longer in the fourth direction than in the third direction, in the first alignment plane.