Patent ID: 9104093
Filing Date: 2015-08-11
Classification: G02B,G03B,H04N

Abstract:
1. An illumination optical system comprising: a lens unit that is arranged on a path of an emitted light to an image forming element for forming an image; a holding unit that holds the lens unit; and an elastic body that is attached to the holding unit, and has integrally-formed first and second parts, the first part being biased in a direction of an optical axis of the light to press the lens unit, and the second part being biased in a direction perpendicular to the direction of the optical axis to press the lens unit, wherein: the lens unit includes a pair of lenses, and out of portions of the elastic body that presses the pair of lenses, portions that correspond to the pair of lenses and are biased in the direction perpendicular to the direction of the optical axis are formed on a same member.