Projector light source apparatus having collimator disposed between excitation light source and phosphor element

摘要

A light source apparatus includes excitation light sources, a phosphor unit, a dichroic mirror that reflects excitation light supplied from the excitation light sources toward the phosphor unit and that transmits fluorescent light emitted from the phosphor unit, and a collimator lens that is provided between the dichroic mirror and the phosphor unit and whose focal distance varies according to the wavelength. The phosphor unit is arranged at a position determined by the focal distance of the collimator lens for the fluorescent wavelength. The collimator lens includes low-dispersion lenses and a high-dispersion lens.

主权项

1. A light source apparatus comprising:
a phosphor unit that emits fluorescent light by an excitation caused by an excitation light; an excitation light source unit that supplies said excitation light; a reflection unit that reflects said excitation light that is supplied from said excitation light source unit toward said phosphor unit and that transmits said fluorescent light that is emitted from said phosphor unit; and a collimator lens that is provided between said reflection unit and said phosphor unit, having a focal distance which differs according to wavelength; wherein: said phosphor unit is disposed at a position determined by a focal distance of said collimator lens at the wavelength of said fluorescent light that is emitted from said phosphor unit; and said collimator lens includes at least one first lens having a negative power and at least one second lens having a positive power, a Abbe number of said second lens being smaller than that of said first lens.