Patent ID: 9316845
Filing Date: 2016-04-19
CPC Classification: F21V,G02B,G02F,H04N

Claim Text:
1. An illumination unit comprising: an illumination optical system configured to generate linear illumination light formed by two-dimensionally arranging a plurality of linear illumination light beams or a plurality of point-like illumination light beams; and a reflective plate configured to reflect the linear illumination light, wherein the reflective plate is configured to reflect the linear illumination light to or close to a plane passing through a part that generates the linear illumination light and being perpendicular to a plane including the reflective plate, wherein the reflective plate generates reflected light focused on a focal point located on or near a line segment passing through the part that generates the linear illumination light and being parallel to a normal to the plane including the reflective plate, when a light component parallel to a plane perpendicular to the part that generates the linear illumination light, and wherein a pitch of a cubic shape in the reflective surface is equal to a pitch of the part that generates the linear illumination light.