Patent ID: 9563004
Date: 2017-02-07
CPC Classifications: G02B

Claim:
1. An image source unit comprising: a light source; and an optical sheet laminated on the light source, wherein the optical sheet includes: a base material layer; an optical functional layer formed on the light source side surface of the base material layer; and an adhesive layer, the optical functional layer includes: light-transmissive portions extending in one direction and arranged parallel in a direction different from said one direction in a light transmissive manner along the sheet face, having elastic modulus of 800 MPa or more and 2000 MPa or less; and light-absorbing portions arranged between the light-transmissive portions, whose refractive index is set smaller than that of the light-transmissive portions, the light source side face of the light-transmissive portions includes unit light input control elements so that the unit light input control elements project towards the light source side in cross section in the sheet-thickness direction, the light-absorbing portions not being arranged between the unit light input control elements, the light source side face of the light-absorbing portions has a recess portion so that the bottom of the recess portion faces the opposite side from the light source and formed in curved or polygonal manner in cross section in the sheet-thickness direction, wherein depth of the recess portion of the light-absorbing portion is in the range of 0.5-6 μm, the adhesive layer is layered on the light source side face of the optical functional layer and has a refractive index lower than that of the light-transimissive portions, and the storage elastic modulus of an adhesive for forming the adhesive layer is 0.22 MPa or more and 0.8 MPa or less.