PROBLEM TO BE SOLVED: To provide a Fresnel lens capable of reducing generation of concentric stray light.SOLUTION: A Fresnel lens 50 has a sawtooth concavo-convex face 51 where a first face 51a inclined with respect to an optical axis A and a second face 51b approximately parallel to the optical axis A are alternately arranged, in which a light-shielding mask 53 is formed at a position corresponding to the second face 51b.SELECTED DRAWING: Figure 5

    【課題】同心円状の迷光の発生を低減できるフレネルレンズを提供する。【解決手段】フレネルレンズ50は、光軸Aに対して傾斜している第1面51aと、光軸Aに略平行な第2面51bとが交互に配置されて形成される鋸歯状の凹凸面51を有するフレネルレンズ50であって、第2面51bに対応する位置に、遮光マスク53が形成されている。【選択図】図5


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    Title :

    FRESNEL LENS AND HEAD-UP DISPLAY


    Additional title:

    フレネルレンズ及びヘッドアップディスプレイ


    Contributors:

    Publication date :

    2017-07-27


    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



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