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    • 2. 发明申请
    • DIRECT-LIGHT GENERATOR FOR SUN-SKY-IMITATING ILLUMINATION DEVICES
    • US20220163186A1
    • 2022-05-26
    • US17442775
    • 2020-03-26
    • CoeLux S.r.l.
    • Antonio LottiChen LiPeter SchreiberBernd Höfer
    • F21V9/02F21V3/06F21V5/00F21V9/40F21V11/06
    • The present disclosure is directed to a direct-light generator (10) for sun-sky-imitating illumination devices (100) configured for generating natural light similar to that from the sun and the sky, comprising a first emitting surface (22) and an array of light-emitting devices (21) configured to generate from a primary light a direct light (13) which exits the first emitting surface (22) along a direct light direction (15), wherein the direct light (13) exiting the first emitting surface (22) has a luminance profile (Ldirect(x, y, θ, φ)) which has a narrow peak (14) in the angular distribution around the direct-light direction (15) and is uniform across the first emitting surface (22), wherein each light-emitting device (21) comprises a light emitter (24) having an emitting surface and at least a pair of collimation lenses (25,27) illuminated by the light emitter (24), each pair of collimation lenses (25,27) comprising a pre-collimation lens (27) comprising a light inlet surface (27a) facing the light emitter (24) emitting surface and a light outlet surface (27b), the pre-collimation lens (27) being positioned proximal to the light emitter (24) and a collimation lens (25) comprising a light input surface (25a) and a light output surface (25b), the collimation lens (25) being positioned distal from the light emitter (24), the light emitter (24) and the pre-collimation lens (27) being housed in a hollow housing (26) which is internally coated or made of light absorbing material and has at least an aperture where the collimation lens (25) is positioned, wherein the pre-collimation lens (27) of each pair of collimation lenses (25,27) is configured to emit with a substantially angularly constant intensity and to uniformly illuminate a whole light input surface (25a) of the collimation lens (25) of the pair of collimation lenses (25,27) wherein, with the pre-collimation lens having a pre-collimation lens height (b2), and a base of the input surface (25a) of the collimation lens (25) being spaced apart from a base of the inlet surface (27a) of the pre-collimation lens (27) of a lenses distance (h), the ratio (b2/h) between the pre-collimation lens height (b2) and the lenses distance (h) is comprised in the range of 0.2-0.8, more preferably in the range between 0.25-0.75 and even more preferably in the range between 0.3-0.7; and/or wherein, with the pre-collimation lens (27) having a pre-collimation lens maximum width (b1) and the collimation lens (25) having a collimation lens maximum width (C), the ratio (b1/C) between the pre-collimation lens maximum width (b1) and the collimation lens maximum width (C) is comprised in the range of 0.3-0.8, more preferably in the range between 0.35-0.75 and even more preferably in the range between 0.4-0.7.