Patent ID: 11899181
Assignee: SHANGHAI MICRO ELECTRONICS EQUIPMENT (GROUP) CO., LTD
Field: Optics (Instruments)
Classification: CPC G | IPC G

Claim 0:
1. A lithography projection objective, comprising: a first lens group, a second lens group, a third lens group, a fourth lens group, and a fifth lens group, wherein the first lens group, the second lens group, the third lens group, the fourth lens group, and the fifth lens group are sequentially arranged along an optical axis; the first lens group and the third lens group each has a negative optical power, the second lens group and the fourth lens group each has a positive optical power, the fifth lens group has an optical power of 0, a sum optical power of the first lens group, the second lens group, the third lens group, the fourth lens group, and the fifth lens group is 0; the lithography projection objective further comprises an aperture stop; and
the first lens group, the third lens group, and the fourth lens group each comprises aspheric lenses, one aspheric lens of the aspheric lenses comprises an aspherical surface, and a number of the aspheric lenses is greater than or equal to 4 and less than or equal to 8.