Patent ID: 9606447
Date: 2017-03-28
CPC Classifications: G02B,G03F,G21K

Claim:
1. A reflective mirror for reflecting incident light comprising: a base having a base surface that includes a first surface portion and a second surface portion associated with a first base height and a second base height, respectively; and a multilayer film having a first surface situated on the base surface and a second surface opposite the first surface, wherein the second surface has a constant height, wherein the multilayer film is configured to reflect at least a portion of the incident light and includes a first layer and a second layer that are laminated alternately on the base, the multilayer film including a first portion having a first thickness situated at the first surface portion of the base that is associated with the first base height and a second portion having a second thickness different from the first thickness situated at the second surface portion of the base that is associated with the second base height, the second portion being provided at a position rotationally symmetric to a position of the first portion about an optical axis of the reflective mirror.