Light transmission direction control sheet and method for manufacturing same

A light transmission direction control sheet comprising:

• first and second louver layers opposing to each other;
• an interlayer adhesive layer bonding the first and second louver layers;
• an obverse surface film layer opposing to an obverse surface of the first louver layer, the obverse surface film layer being light-transmissive;
• an obverse surface-side adhesive layer bonding the first louver layer and the obverse surface film layer;
• a reverse surface film layer opposing to a reverse surface of the second louver layer, the reverse surface film layer being light-transmissive;
• and
• a reverse-surface side adhesive layer bonding the second louver layer and the reverse surface film layer,
• wherein
• the first and second louver layers are laminated crosswise,
• the first and second louver layers are each formed by arranging a plurality of light-transmitting strips and a plurality of light-shielding strips, alternately, each light-transmitting strip is formed of a light transmissive silicone rubber, each light-shielding strip is formed of a colored silicone rubber, a Shore A hardness of the silicone rubbers is 73 or more and 83 or less when measured with a type A durometer in accordance with JIS K 6253, and
• the interlayer adhesive layer, the obverse surface-side adhesive layer, and the reverse-surface side adhesive layer are each formed of adhesive silicone rubber, having a Shore A hardness of 10 or more and 60 or less when measured with a type A durometer in accordance with JIS K 6253, and at least a thickness of the interlayer adhesive layer is 10 μm or more and 32 μm or less.