PROBLEM TO BE SOLVED: To provide an illumination lens capable of suppressing illuminance irregularity in illumination by emitted light.SOLUTION: An illumination lens 4 illuminating a display unit 5 by condensing rays from a light source 3 and emitting the condensed rays to the display unit 5 comprises: a plurality of first lens surface sections 40 each formed into a shape extracted partially from a first virtual lens surface 40a having the light source 3 arranged on a first optical axis L1 and enabling at least second derivative between optical axes L1 and L2 aligned in a reference direction X as a virtual lens surface defining the first optical axis L1 by setting the first optical axis L1 to be eccentric from the second optical axis L2 in the reference direction X; and a plurality of second lens surface sections 41 each formed into a shape extracted partially from a second virtual lens surface 41a enabling at least first derivative between the optical axes L1 and L2 aligned in the reference direction X as a virtual lens surface defining the second optical axis L2, the second lens surface sections being arranged in the reference direction X to alternate with the first lens surface sections 40.SELECTED DRAWING: Figure 3

    【課題】出射光による照明において照度ムラを抑制する照明用レンズの提供。【解決手段】光源3からの光を集光して表示器5側へ出射することにより、当該表示器5を照明する照明用レンズ4は、第一光軸L1を第二光軸L2とは基準方向Xに偏心させて定める仮想レンズ面として、光源3が第一光軸L1上に配置され且つ基準方向Xに並ぶ光軸L1,L2間にて少なくとも二階微分が可能な第一仮想レンズ面40aから、一部分ずつ抽出した形状に形成される複数の第一レンズ面部40と、第二光軸L2を定める仮想レンズ面として、基準方向Xに並ぶ光軸L1,L2間にて少なくとも一階微分が可能な第二仮想レンズ面41aから、一部分ずつ抽出した形状に形成され、基準方向Xにおいて第一レンズ面部40と交互に配列される複数の第二レンズ面部41と、を有する。【選択図】図3


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    Title :

    ILLUMINATION LENS, ILLUMINATION UNIT, AND HEAD-UP DISPLAY DEVICE


    Additional title:

    照明用レンズ、照明ユニット及びヘッドアップディスプレイ装置


    Contributors:

    Publication date :

    2017-12-21


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Japanese


    Classification :

    IPC:    G02B Optische Elemente, Systeme oder Geräte , OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS / B60K Anordnung oder Einbau von Antriebseinheiten oder von Kraft- bzw. Drehmomentübertragungen in Fahrzeugen , ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES / F21V FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF , Funktionsmerkmale oder Einzelheiten von Leuchten oder Beleuchtungssystemen



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