DIFFUSION PLATE, DISPLAY DEVICE, PROJECTION DEVICE, ILLUMINATION DEVICE AND REMOTE SENSING-PURPOSE LIGHT SOURCE

• Main Authors: NODA KAZUHIKO, ARIMA MITSUO, KANASUGI SHUNSUKE, ISHIWATARI MASAYUKI
• Format: Patent
• Language: English; Japanese
• Published: 30.06.2022
• Subjects: ACCESSORIES THEREFOR; ADVERTISING; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USINGWAVES OTHER THAN OPTICAL WAVES; APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FORPROJECTING OR VIEWING THEM; BLASTING; CINEMATOGRAPHY; CRYPTOGRAPHY; DISPLAY; DISPLAYING; EDUCATION; ELECTROGRAPHY; FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMSTHEREOF; HEATING; HOLOGRAPHY; LABELS OR NAME-PLATES; LIGHTING; MECHANICAL ENGINEERING; OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS; OPTICS; PHOTOGRAPHY; PHYSICS; SEALS; SIGNS; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHERARTICLES, NOT OTHERWISE PROVIDED FOR; WEAPONS

To enable improvement in uniformity of intensity of diffusion light, reducing spectrum noise occurring due to a diffraction phenomenon in a cyclical structure, and to improve a light distribution property, reducing noise of 0-order diffraction light.SOLUTION: A microlens array type diffusion plate 1 emitting diffusion light in a linear way comprises: a base material 10; and a plurality of cylindrical lenses 21 that are arrayed in an X-direction on an X-Y plane of the base material 10, and made of a convex strip part or concave strip part extending in a Y-direction. An opening width D and radius of curvature R in the X-direction of respective cylindrical lenses 21 fluctuate respectively at random within a fluctuation range to be defined by fluctuation full-width rates δD and δR with a reference opening width Dk and reference radius of curvature Rk as a reference. An amount of eccentricity Ec of respective cylindrical lenses 21 fluctuates within a fluctuation range to be defined by a fluctuation full-width ratio δEc. The δD, δR and δEc satisfy an expression (1), and at least one of the δD or δR is not 0%.SELECTED DRAWING: Figure 2 【課題】周期構造の回折現象により発生するスペクトルノイズを低減して直線状の拡散光の強度の均質性を向上でき、かつ、０次回折光のノイズを低減して配光性も向上する。【解決手段】直線状の拡散光を出射するマイクロレンズアレイ型の拡散板１は、基材１０と、基材１０のＸＹ平面上にＸ方向に配列され、Ｙ方向に延びる凸条部または凹条部からなる複数のシリンドリカルレンズ２１とを備える。各々のシリンドリカルレンズ２１のＸ方向の開口幅Ｄ、曲率半径Ｒはそれぞれ、基準開口幅Ｄｋ、基準曲率半径Ｒｋを基準として、変動全幅率δＤ、δＲで規定される変動範囲内でランダムに変動している。各々のシリンドリカルレンズ２１の偏心量Ｅｃは、変動全幅率δＥｃで規定される変動範囲内でランダムに変動している。δＤ、δＲおよびδＥｃは、式（１）を満たし、かつ、δＤまたはδＲのうち少なくとも一方は０％ではない。【選択図】図２