DIFFUSION PLATE AND PROJECTION-TYPE PROJECTOR DEVICE

The present disclosure provides a diffuser plate capable of achieving excellent appearance quality when an image is projected. A transmissive diffuser plate (10) including a microlens angle modulation distribution group provided on at least one of a light incident surface and a light emitting surfac...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser:	UCHIDA, Atsushi, KARAI, Masaru, ISHIDA, Koji
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	ACCESSORIES THEREFOR APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USINGWAVES OTHER THAN OPTICAL WAVES APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FORPROJECTING OR VIEWING THEM CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS OPTICS PHOTOGRAPHY PHYSICS
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Beschreibung
Zusammenfassung:	The present disclosure provides a diffuser plate capable of achieving excellent appearance quality when an image is projected. A transmissive diffuser plate (10) including a microlens angle modulation distribution group provided on at least one of a light incident surface and a light emitting surface is provided. A microlens angle modulation distribution group (2) includes a plurality of microlenses (3) and an angle modulation part (4) having an angle modulation distribution for slightly angle-modulating a direction of main light emitted from each of the plurality of microlenses (3). When a ratio »/P of a wavelength » [µm] of the main light to an average arrangement period P [µm] of the microlens (3) is denoted by ¸ [rad], and when the direction of the main light emitted from each of the plurality of microlenses (3) is modulated by a modulation angle ± [rad], a ratio ±/¸ of the modulation angle ± to ¸ satisfies 0.1 < ±/ ¸