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

Claim 11:
12. The lithography projection objective of claim 1, wherein the first lens group comprises an anamorphic lens compensator, the anamorphic lens compensator is a lens in the first lens group, a range of an aperture-thickness ratio of the anamorphic lens compensator is 9 to 10, and the aperture-thickness ratio is a ratio of a maximum aperture of a lens to a thickness of a lens; and
an effective aperture of a first surface of the anamorphic lens compensator is ϕ1, and an effective aperture of a second surface of the anamorphic lens compensator is ϕ2, wherein the second surface of the anamorphic lens compensator is located between the first surface of the anamorphic lens compensator and the second lens group, and ϕ2−ϕ1>20 mm.