Abstract: A manufacture method of an optical sheet made of a transparent thermoplastic resin sheet on whose surface a regular geometric design working is performed, the optical sheet manufacture method comprising steps of performing a geometric design working on the resin sheet at a temperature not lower than a glass transition temperature of the resin sheet, by using a metal endless working belt formed with a geometric design on a surface thereof, rapidly cooling the resin sheet on which the geometric design working is performed to a temperature lower than the glass transition temperature, and detaching the rapidly cooled resin sheet from the metal endless working belt.

Abstract: An optical sheet manufacturing apparatus includes a first master including a first three-dimensional structure, a second master including a second three-dimensional structure, a first processing unit to heat a first surface of a resin sheet to a first temperature and transfer the first three-dimensional structure onto the first surface heated, a second processing unit to cool the first surface to a second temperature lower than the first temperature, heat a second surface of the resin sheet to a third temperature higher than the second temperature, and transfer the second three-dimensional structure onto the second surface heated, a third processing unit to cool the second surface to a fourth temperature lower than the third temperature, a first conveyance mechanism to perform conveyance from the first processing unit to the second processing unit, and a second conveyance mechanism to perform conveyance from the second processing unit to the third processing unit.

Abstract: An optical sheet manufacturing apparatus includes a first master including a first three-dimensional structure, a second master including a second three-dimensional structure, a first processing unit to heat a first surface of a resin sheet to a first temperature and transfer the first three-dimensional structure onto the first surface heated, a second processing unit to cool the first surface to a second temperature lower than the first temperature, heat a second surface of the resin sheet to a third temperature higher than the second temperature, and transfer the second three-dimensional structure onto the second surface heated, a third processing unit to cool the second surface to a fourth temperature lower than the third temperature, a first conveyance mechanism to perform conveyance from the first processing unit to the second processing unit, and a second conveyance mechanism to perform conveyance from the second processing unit to the third processing unit.

Abstract: A manufacture method of an optical sheet made of a transparent thermoplastic resin sheet on whose surface a regular geometric design working is performed, the optical sheet manufacture method comprising steps of performing a geometric design working on the resin sheet at a temperature not lower than a glass transition temperature of the resin sheet, by using a metal endless working belt formed with a geometric design on a surface thereof, rapidly cooling the resin sheet on which the geometric design working is performed to a temperature lower than the glass transition temperature, and detaching the rapidly cooled resin sheet from the metal endless working belt.