Patent ID: 11960077
Assignee: CANON KABUSHIKI KAISHA
Field: Optics (Instruments)
Classification: CPC G | IPC G

Claim 8:
9. The apparatus according to claim 1, wherein a following inequality is satisfied:

0.6≤(wlap/wb0)/(w10/w0)≤1.3

where w10 and w0 represent a light flux width of an outermost off-axis light flux and an axial light flux when they are incident on the system, respectively, wb0 represents the light flux width in a direction perpendicular to an axis of the axial light flux on the element, and wlap represents a width in the direction perpendicular to the axis of a portion in which the outermost off-axis light flux and the axial light flux overlap each other on the element, in a meridional cross section when the aperture radius is maximum.