Method for manufacturing functional plastic lens and polarizing plastic lens

Patent metadata

Field	Value
Publication number	US-10525645-B2
Application number	US-201615557928-A
Country	US
Kind code	B2
Filing date	Mar 31, 2016
Priority date	Mar 31, 2015
Publication date	Jan 7, 2020
Grant date	Jan 7, 2020

Abstract

In manufacturing a functional plastic lens by loading a functional sheet S having a difference in the accuracy of bending in directions, into a mold 50 and 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 mold 50 to 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.

First claim

The invention claimed is:

1. A method of manufacturing a functional plastic lens, in manufacturing the functional plastic lens by loading a functional sheet having a difference in accuracy of bending in directions, into a mold and by performing insert molding to integrally mold a lens body with the functional sheet, the method comprising:
making a direction in which the accuracy of the bending of the functional sheet is greatest, a reference axis;
loading the functional sheet into the mold to inhibit a filling direction of resin and the reference axis from being orthogonal to each other, and
filling the resin into the mold to integrally mold the lens body with the functional sheet.

2. The method of manufacturing a functional plastic lens according to claim 1 , wherein
the functional sheet is loaded into the mold to make a slant of the reference axis to the filling direction of the resin, at 45° or less.

3. The method of manufacturing a functional plastic lens according to claim 1 ,
further comprising bending the functional sheet before the loading step such that the functional sheet has a curvature in a direction along the reference axis which curvature is substantially identical to a curvature on a molding surface of the mold in a direction along which the reference axis of the functional sheet is oriented.

4. The method of manufacturing a functional plastic lens according to claim 1 ,
further comprising bending the functional sheet before the loading step such that the functional sheet has a curvature in a direction along the reference axis, which curvature of the functional sheet is greater than a curvature on a molding surface of the mold in a direction along which the reference axis of the functional sheet is oriented.

Assignees

• Hoya Lens Thailand Ltd

Inventors

• Saito Kiyohiro
• Suzuki Takashi
• Sato Kiyonori
• Tanagawa Kenji

Classifications

• B29C45/56

  using mould parts movable during or after injection, e.g. injection-compression moulding {(B29C45/1705 and B29C45/572 take precedence)} · CPC title

• B29D11/00009

  Production of simple or compound lenses · CPC title

• B29K2995/0034

  Polarising · CPC title

• B29L2011/0016

  Lenses · CPC title

• G02B3/00

  Simple or compound lenses · CPC title