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

Claim 1:
2. The lithography projection objective of claim 1, wherein,
an aspheric deviation degree of each the aspheric lenses in the first lens group and the third lens group is less than 0.5 mm; and an aspheric deviation degree of at least one aspheric lens in the fourth lens group is greater than or equal to 0.5 mm; or,
an aspheric deviation degree of each the aspheric lenses in the first lens group and the fourth lens group is less than 0.5 mm, and an aspheric deviation degree of at least one aspheric lens in the third lens group is greater than or equal to 0.5 mm;
wherein an aspheric deviation degree of an aspheric lens is an axial distance between an aspheric surface of the aspheric lens and a best-fitting spherical surface.