Title:
拡散板及び投影式プロジェクタ装置
Document Type and Number:
Japanese Patent JP6858180
Kind Code:
B2
Abstract:
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 <±/ ¸ <10.0.
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Inventors:
Atsushi Uchida
Ken Karai
Koji Ishida
Ken Karai
Koji Ishida
Application Number:
JP2018514610A
Publication Date:
April 14, 2021
Filing Date:
April 25, 2017
Export Citation:
Assignee:
KURARAY CO.,LTD.
International Classes:
G02B5/02; G02B3/00
Domestic Patent References:
| JP2006162887A | ||||
| JP2005258306A | ||||
| JP2008282026A | ||||
| JP2011215464A |
Foreign References:
| WO2009118946A1 | ||||
| WO2016051785A1 | ||||
| EP3035110A1 |
Attorney, Agent or Firm:
Ken Ieiri