Molded-article manufacturing method, mold, and optical element including fresnel lens
AssigneeCanon Kabushiki Kaisha
InventorShuusuke Tobita
Life of this patent
Estimating the term…
Abstract
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.
Claims11
A molded-article manufacturing method that transfers shapes of a center-portion transfer shape surface, a side wall surface, and a frame-portion transfer shape surface provided in a cavity onto resin by injecting gas and the resin into the cavity, the method comprising:
- inserting and fitting a center-portion molding member having the center-portion transfer shape surface and the side wall surface in a frame-portion molding member, the center-portion molding member or the frame-portion molding member having the frame-portion transfer shape surface to form a part of the cavity,
- wherein the center-portion molding member has a groove portion on the side wall surface, the groove portion extending from the center-portion transfer shape surface and protruding from the frame-portion transfer shape surface;
- and
- sealing a portion, of the side wall surface, from the groove portion to the frame-portion transfer shape surface, with the resin before the shape of the center-portion transfer shape surface is transferred onto the resin, to form, between the center-portion transfer shape surface and the resin, a space in which the gas is confined.
A mold comprising:
- a gas supply unit configured to inject gas into a cavity;
- a resin injection unit configured to inject resin into the cavity;
- a center-portion molding member having a center-portion transfer shape surface and a side wall surface;
- a frame-portion molding member having a frame-portion transfer shape surface;
- and
- a gate provided in the frame-portion molding member,
- wherein the side wall surface has a groove portion, and
- wherein the center-portion molding member is inserted and fitted in the frame-portion molding member to form the cavity so that a portion, of the side wall surface, from the groove portion to the frame-portion transfer shape surface protrudes.
A mold comprising:
- a gas supply unit configured to inject gas into a cavity;
- a resin injection unit configured to inject resin into the cavity;
- a center-portion molding member including a side wall surface and a frame-portion transfer shape surface that are provided on an outer periphery of a center-portion transfer shape surface and a groove portion provided in the side wall surface;
- a frame-portion molding member;
- and
- a gate for injecting the resin into the cavity, the gate being provided in the frame-portion molding member,
- wherein the center-portion molding member is inserted and fitted in the frame-portion molding member to form the cavity.
Dependencies are inferred from the claim text.