Asia Optical Co., Ltd.

Ast Products, Inc.

Chuan-Hui Yang

Wen-Chu Tseng

Yi-Feng Chiu

Ching-Hua Wang

A double-sided aspheric diffractive multifocal lens and methods of manufacturing and design of such lenses in the field of ophthalmology. The lens can include an optic comprising an aspheric anterior surface and an aspheric posterior surface. On one of the two surfaces a plurality of concentric diffractive multifocal zones can be designed. The other surface can include a toric component. The double-sided aspheric surface design results in improvement of the modulation transfer function (MTF) of the lens-eye combination by aberration reduction and vision contrast enhancement as compared to one-sided aspheric lens. The surface having a plurality of concentric diffractive multifocal zones produces a near focus, an intermediate focus, and a distance focus.

Double-sided aspheric diffractive multifocal lens, manufacture, and uses thereof

A molding apparatus for lenses includes first and second molding units. Each of the first and second molding units has a mold core holder, a plurality of mold cores disposed in the mold core holder, and a plurality of fixing elements. The mold core holder has an abutment surface and a plurality of cavities, each of which includes an open end and a positioning portion. Each fixing element engages removably the positioning portion of a respective cavity, and retains a respective mold core in the respective cavity. Individual removal of the mold cores for replacement is permitted by operating the fixing elements.

Molding apparatus with removable mold cores

A molding apparatus for lenses includes first and second molding units, each of which has a mold core holder, a plurality of mold cores disposed in the mold core holder, and a clamp unit provided within the mold core holder. The mold core holder has an abutment surface, and a plurality of cavities extending inwardly from the abutment surface and receiving respectively the mold cores. The cavities include cavity walls, respectively. The clamp unit includes a plurality of clamp elements attached to the clamp unit to clamp respectively the mold cores against the cavity walls. Individual removal of the mold cores of the molding units for replacement is permitted by operating the clamp elements.

Growing community of inventors

Taichung, Taiwan

Chuan-Hui Yang