Optical functional film for head-up display, optical laminate, functional glass, and head-up display system
AssigneeNippon Kayaku Kabushiki Kaisha
InventorsMitsunori Nakamura, Chihiro Takahashi, Tomoyuki Hayasaki, Yoshihiko Taira, Yoshiyuki Yahagi
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Abstract
An optical functional film for a head-up display according to the present disclosure includes (A) two or more phase difference layers and (B) an adhesive layer. The adhesive layer is adjacent to at least one phase difference layer, and an absolute value of difference between a refractive index of the adhesive layer and a refractive index of the phase difference layer adjacent to the adhesive layer in a direction of a fast axis is less than 0.060.
Claims13
An optical functional film for a head-up display, comprising (A) two or more phase difference layers and (B) an adhesive layer, wherein
- all of (A) the two or more phase difference layers are ½ wavelength plates;
- (B) the adhesive layer is provided adjacent to the two or more phase difference layers;
- and
- an absolute value of difference between a refractive index of the adhesive layer and a refractive index of the phase difference layers adjacent to the adhesive layer in a direction of a fast axis is less than.
Dependencies are inferred from the claim text.