Patent ID: 6926413

Claim:
A supporting mechanism for a rod integrator, a cross-sectional shape of the rod integrator is a quadrilateral, the supporting mechanism comprising: a first holding member that holds a rod integrator; a first supporting member that presses the first holding member against the rod integrator to support the rod integrator, the first holding member comprises: a first contact portion which contacts with a first side surface of the rod integrator; a first facing portion which is spaced from a first side edge of the first side surface; and a second contact portion which contacts with a second side surface of the rod integrator, the second side surface being adjacent to the first side surface and sharing the first side edge with the first side surface; a second holding member that holds the rod integrator, a second supporting member that presses the second holding member against the rod integrator to support the rod integrator, the second holding member comprises: a third contact portion which contacts with a third side surface of the rod integrator; a second facing portion which is spaced from a second side edge of the third side surface; and a fourth contact portion which contacts with a fourth side surface of the rod integrator, the fourth side surface being adjacent to the third side surface and sharing the second side edge with the third side surface, wherein the first and second supporting members press the rod integrator along a direction of a diagonal of the quadrilateral cross section of the rod integrator in opposite directions to one another.