Patent ID: 9591279
Date: 2017-03-07
CPC Classifications: G03B,H04N,H05B

Claim:
1. A light source unit comprising: a light source configured to emit excitation light having a first wavelength; a fluorescent member configured to emit, when irradiated with the excitation light from the light source, fluorescence light having a second wavelength different from the first wavelength; and an adjuster configured to adjust a conversion efficiency from the excitation light to the fluorescence light of the fluorescent member so that a gradient, denoted by T, satisfies: in a fluorescence characteristic of the fluorescent member when a horizontal axis represents a normalized light intensity of the excitation light so that a maximum light intensity of the excitation light incident on the fluorescent member is normalized to 1, and a vertical axis represents the light intensity of the fluorescence light emitted from the fluorescence member that is irradiated with the normalized light intensity of the excitation light, where G represents a gradient in the fluorescence characteristic when the normalized light intensity of the excitation light is 0.3.