Light source apparatus and image projection apparatus

摘要

A light source apparatus (100) includes a light source (1a) to emit excitation light; a phosphor (5) as a rotatable wavelength convertor; a motor (6) to drive the phosphor (6); an excitation light condensing optical system (101) to condense the excitation light emitted from the light source (1a) onto the phosphor (5); and a casing (18) having a closed space to encase the light source (1a), the phosphor (5), and the excitation light condensing optical system (101), and at least a part of the motor (6) while a remaining part of the motor (6) being protruded to an external space of the casing (18).