Hoya Corporation

Hoya Lens Thailand Ltd.

Kenji Tanagawa

Kiyohiro Saito

Takashi Suzuki

Tetsuya Uchida

Tatsuo Nishimoto

Kiyonori Sato

A mold for a plastic lens that arranges an insert member inside a cavity formed between a pair of halved molds, injects and fills molten raw material resin to mold a plastic lens having a predetermined shape, integrally with the insert member. The insert member is arranged on a molding surface on one of the halved molds, a notch to be engaged with a positioning tab formed at a periphery of the insert member is engraved on one parting surface of the halved mold, overlapping with a gate position. Positioning of the insert member is performed by engaging the positioning tab with the notch. With this configuration, in molding a plastic lens having an insert member by injection molding including insert molding, positioning of the insert member is performed at the gate position without deteriorating the quality of a molded product and without increasing the load of post-processing after molding.

Mold for plastic lens, method for manufacturing plastic lens, and plastic lens for eyeglasses

In manufacturing a functional plastic lens by loading a functional sheet S having a difference in the accuracy of bending in directions, into a moldand by performing insert molding to integrally mold a lens body with the functional sheet S, a direction in which the accuracy of the bending to the functional sheet S is high is made to be a reference axis A, and the functional sheet S is loaded into the moldto inhibit a filling direction of resin and the reference axis A from being orthogonal to each other. With this arrangement, the functional plastic lens having high quality is provided.

Method for manufacturing functional plastic lens and polarizing plastic lens

An injection compression molding method of a lens is provided, where a toggle link mechanism () is actuated to close a molding die () and a movable die plate () is moved to a position establishing a cavity thickness of greater than a thickness of an article to be molded while the die is closed. After injecting a molten resin into the cavity, the molten resin is sealed in the cavity and the toggle link mechanism () is actuated to advance the movable die plate () toward a fixed die plate (), the relative position of a rear die plate () and the movable die plate () is made constant at a position where extension of a tie bar () becomes a predetermined value, and the molten resin is cooled for a predetermined time after completion of pressurizing the resin.

Injection compression molding method of lens

Injection compression molding method and injection compression machine of lens

Growing community of inventors

Tokyo, Japan

Kenji Tanagawa