Canon Kabushiki Kaisha

Shuusuke Tobita

Yusuke Ohmura

A center-portion molding member having a center-portion transfer shape surface and a side wall surface is inserted and fitted in a frame-portion molding member having a frame-portion transfer shape surface to form a part of a cavity. The center-portion molding member has a groove portion in the side wall surface. The groove portion protrudes from the frame-portion transfer shape surface. Before injected resin transfers a shape of the center-portion transfer shape surface, the side wall surface of the center-portion molding member is sealed with the resin to form, between the center-portion transfer shape surface and the resin, a space in which gas is confined.

Molded-article manufacturing method, mold, and optical element including fresnel lens

A surface of a base material of a Fresnel lens has a central area having circular zones arranged therein and an outer area located on the outer side of the central area and having circular-arc zones arranged therein. The pitch of zones in a boundary area between the central area and the outer area and where the zone shape changes is smaller than a basic pitch which is the pitch of the circular and circular-arc zones in the central area and the outer area.

Growing community of inventors

Kamakura, Japan

Shuusuke Tobita