Patent ID: 11892764
Assignee: SEIKO EPSON CORPORATION
Field: Optics (Instruments)
Classification: CPC G | IPC G

Claim 12:
13. The projection system according to claim 11,
wherein axes X, Y, and Z are three axes perpendicular to one another, an axis-X direction being a width direction of an enlargement-side image formation plane, an axis-Y direction being an upward/downward direction of the enlargement-side image formation plane, and an axis-Z direction being a direction perpendicular to the enlargement-side image formation plane,
a pupil that connects an upper intersection to a lower intersection inclines with respect to an imaginary vertical line perpendicular to the second optical axis in a plane YZ containing the first and second optical axes,
the upper intersection is an intersection where an upper peripheral light ray of an upper end light flux passing through an upper end of an effective light ray range of the second transmissive surface that is an upper end in the axis-Y direction and an upper peripheral light ray of a lower end light flux passing through a lower end of the effective light ray range that is a lower end in the axis-Y direction intersect each other in the plane YZ, and
the lower intersection is an intersection where a lower peripheral light ray of the upper end light flux and a lower peripheral light ray of the lower end light flux intersect each other in the plane YZ.