| 摘要 |
<p>The present disclosures achieve an illumination optical system that has small etendue, a longer service life, and higher brightness, and that is provided with: a laser light source that generates excitation light; a fluorescent body that generates fluorescent light by means of the aforementioned excitation light; a light tunnel that radiates the aforementioned excitation light that enters one end thereof towards the aforementioned fluorescent body from the other end, and that radiates the fluorescent light generated by the aforementioned fluorescent body from the aforementioned one end; and an optical element that is provided in the light path of the aforementioned laser light source and the aforementioned light tunnel, reflects the aforementioned excitation light, and transmits the aforementioned fluorescent light.</p> |
