Optical Film, Surface Light Emitting Body, and Method for Producing Optical Film

An optical film that is provided with a plurality of aligned convex microlenses, wherein:

• the microlenses have a region alpha and a region beta;
• the region beta forms an outer part of the convex shape of the microlenses and positioned so as to cover the region alpha;
• the region beta contains fine particles;
• the region alpha contains fine particles as necessary;
• and
• the content P1 of the fine particles in the region alpha is lower than the content P2 of the fine particles in the region beta.

An optical film that is provided with a plurality of aligned convex microlenses, wherein:

• the microlenses have a region alpha and a region beta;
• the region beta forms an outer part of the convex shape of the microlenses and positioned so as to cover the region alpha;
• the region alpha contains fine particles;
• the region beta contains fine particles as necessary;
• and
• the content P1 of the fine particles in the region alpha is higher than the content P2 of the fine particles in the region beta.

A method for producing an optical film provided with a plurality of aligned convex microlenses comprising the following steps A to D that are sequentially performed:

• step A:
• a step of rotating a roll mold having an outer peripheral surface provided with a plurality of aligned concave microlens transfer units, applying an active energy ray curing composition B onto the outer peripheral surface of the roll mold while making a base material travel in a rotational direction of the roll mold along the outer peripheral surface of the roll mold, and filling a part of a concave shape of the microlens transfer units with the active energy ray curing composition B;
• step B:
• a step of providing an active energy ray curing composition A to between the outer peripheral surface of the roll mold and the base material;
• step C:
• a step of irradiating a region between the outer peripheral surface of the roll mold and the base material with an active energy ray, in a state in which the active energy ray curing composition A is interposed between the outer peripheral surface of the roll mold and the base material;
• and
• step D:
• a step of separating a cured product obtained in the step C from the roll mold.