Resin sheet producing method, optical member produced by resin sheet producing method, area light source device in which optical member is used, liquid crystal display device, and mobile device
An area light source device has a transfer-molded optical member, and a light source disposed in a position facing at least one of end faces of the optical member. Light incident to the optical member from the light source is output through a light exit surface of the optical member. A cutting back clearance portion is provided in at least one of corner portions of the end face of the optical member.
1. A resin sheet producing method comprising:
cutting an end face of a transfer-molded resin sheet with a cutting part,
wherein the cutting part comprises a rotating axis which is parallel with the end face of the resin sheet,
wherein the cutting part cuts the resin sheet in a straight line along the end face and moves toward a cutting back clearance portion provided in a corner portion of the end face, and
wherein the cutting back clearance portion has a predetermined angle with respect to the end face to be cut, and
performing, via a mirror finish part, mirror finish to the end face of the resin sheet cut with the cutting part,
wherein the mirror finish part includes a turn axis that is orthogonal to the end face of the resin sheet and a mirror finish edge that is provided in a side surface of the mirror finish part facing the end face.
2. The resin sheet producing method according to claim 1 , wherein the cutting back clearance portion is a tapered surface.
3. The resin sheet producing method according to claim 2 , further comprising:
rotating a cutting edge provided in an outer peripheral surface of the cutting part.
4. The resin sheet producing method according to claim 1 , further comprising:
rotating a cutting edge provided in an outer peripheral surface of the cutting part.
5. The resin sheet producing method according to claim 1 , further comprising:
providing a dummy sheet in at least one surface of the stacked resin sheets, wherein the mirror finish edge performs cutting toward the dummy sheet.