| 主权项 |
1. An illumination device comprising:
a light-emitting device having (i) a plurality of light-emitting elements that emit ultraviolet ray or short-wavelength visible light having a peak wavelength in a wavelength region of 380 to 420 nm, (ii) a substrate on which the plurality of light-emitting elements are mounted, wherein all of the light-emitting elements on the substrate are arranged in a single row, (iii) a first phosphor that is excited by the ultraviolet ray or short-wavelength visible light and emits visible light having a peak wavelength in a wavelength region of 560 to 600 nm, (iv) a second phosphor that is excited by the ultraviolet ray or short-wavelength visible light and emits visible light in complementary color relationship with the visible light emitted by the first phosphor, and (v) a light-transmitting member that covers the plurality of light-emitting elements and contains the first phosphor and the second phosphor dispersed therein, so as to obtain white color by mixing the light from each of the first and second phosphors; and a diffusion member that has a diffusivity of 10% or more and diffuses at least a part of the light emitted from the light emitting device, said diffusion member having a plate shape and including (i) an incident surface which opposes the light-emitting surface of the light emitting device and on which light emitting from the light emitting device is incident, and (ii) a light-exiting surface from which light transmitted through the diffusion member exits and which is opposite to the incident surface, wherein a volume concentration of the whole phosphors contained in the light-transmitting member is 0.01 vol % or more and 10 vol % or less, wherein the light-transmitting member (i) has a shape having a thickness in a direction perpendicular to a light-exiting surface of the light-emitting elements of 0.4 mm or more and 20 mm or less and (ii) integrally seals the upper surface of the substrate on which the plurality of light-emitting elements are mounted, wherein a relationship of Ia<0.5×Imax is satisfied, where Imax is the maximum intensity of the excitation spectrum of the first phosphor, and Ia is the intensity of the excitation spectrum of the first phosphor at the peak wavelength of the light emission spectrum of the second phosphor, wherein the light-emitting elements are disposed so that an interval thereof to adjacent light-emitting elements is within a range of 0.4 mm to 20 mm, and wherein the diffusion member is disposed such that a distance thereof to the light-transmitting member is at least 3 mm. |
