Method of making a finished multi-coated and/or laminated eyeglass lens

• US 6,180,033 B1
• Filed: 11/12/1997
• Issued: 01/30/2001
• Est. Priority Date: 08/19/1992
• Status: Expired due to Fees

• Current Assignee: Chrysalis Development
• Original Assignee: Chrysalis Development
• Inventors: Greshes, Martin
• Primary Examiner(s): Vargot, Mathieu D.
• Application Number:
  US08/968,237
• Time in Patent Office: 1,175 Days
• Field of Search: 264/1.7, 264/2.3, 264/2.4, 264/1.8, 264/1.9, 264/1.1, 264/1.32, 425/808
• US Class Current: 264/1.32
• CPC Class Codes: B29C 2791/001 Shaping in several steps
• CPC Class Codes: B29C 33/02 with incorporated heating or cooling means
• CPC Class Codes: B29C 35/00 Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor moulds with incorporated heating or cooling means B29C33/02 ; thermal after-treatment of shaped articles B29C71/02; curing devices for plastics dental prostheses A61C13/14; before moulding B29B13/00
• CPC Class Codes: B29C 43/203 Making multilayered articles
• CPC Class Codes: B29C 43/52 Heating or cooling
• CPC Class Codes: B29D 11/00009 Production of simple or compound lenses
• CPC Class Codes: B29D 11/00192 Demoulding, e.g. separating lenses from mould halves
• CPC Class Codes: B29D 11/00201 using cooling means
• CPC Class Codes: B29D 11/00211 using heating means
• CPC Class Codes: B29D 11/00413 made by moulding between two mould parts which are not in direct contact with one another, e.g. comprising a seal between or on the edges B29D11/00019 - B29D11/00355, B29D11/00423, B29D11/00432 take precedence
• CPC Class Codes: B29D 11/00432 Auxiliary operations, e.g. machines for filling the moulds B29D11/00125 takes precedence
• CPC Class Codes: B29D 11/0073 Optical laminates
• CPC Class Codes: B29K 2995/0034 Polarising
• CPC Class Codes: B29L 2011/0033 Multifocal lenses
• CPC Class Codes: Y10S 425/808 Lens mold

Abstract

A compression process for fabricating a substantially finished coated/layered lens for eyeglasses with a thermoplastic lens preform, with the lens having surfaces for correcting vision. The process comprised suitably placing on at least one of a pair of molds with molding surfaces conforming to the surfaces of the finished lens a thermoplastic film-layer/coating or multiple layers or coatings, each having a given thickness and predetermined characteristics and/or properties desired in the finished lens. The lens preform is then placed on the thermoplastic film-layer/coating; and heating and molding in situ of the film-layer/coating with the lens preform is then conducted while the lens preform is under compressive forces of the compression process until a generally predetermined lens thickness is achieved. Then the molds are first cooled and opened so as to remove the substantially finished lens with the film-layer/coating simultaneously molded/coated thereon, whereby a finished molded prescription eyeglass lens is formed with the molded thermoplastic film-layer/coating molded thereto on one or both sides thereof during the compression process.

Claims

1. A method of making a finished lens having a predetermined RX, and one or more property selected from the group consisting of anti-reflection, polarization, photochromic, and scratch resistance by a compression molding process comprising:

a) placing a first flat solid film on at least one of a pair of molds, having molding surfaces conforming to said surface of said finished lens;

b) placing a thermoplastic preform blank on said flat film;

c) said first flat solid film having two or more layers including a thermoplastic top layer for engagement with said preform blank, and one or more additional layers providing said property;

d) heating and molding together in situ said flat film with said preform blank in said pair of molds while said preform blank is under pressure, whereby said preform blank softens and substantially undergoes material displacement of said thermoplastic material so that the said thermoplastic material fills said mold;

e) said flat film deforming to the shape of said mold and fusing to the softened preform blank to form a unitary finished lens having said predetermined RX and one or more of said properties;

f) cooling said pair of molds;

g) opening said pair of molds after said cooling to remove said substantially finished lens;

h) said flat film simultaneously fusing to said lens blank to form a unitary substantially finished prescription eyeglass lens.

2. The method of claim 1 further comprising placing a second flat solid film on said thermoplastic preform after said preform has been placed on said first flat solid film, and prior to heating and molding so that a flat solid film contacts both sides of said preform;

said second flat solid film having two or more layers including a thermoplastic top layer for engagement with said preform blank, and one or more layers providing said property.

3. The method of anyone of claims 1 or 2 wherein said layers of said flat film are laminated together.

4. The method of claim 3 wherein said flat film thermoplastic top layer is selected from the group consisting of polyester;

acetate, polycarbonate, polyurethane and cellulose butyrate.

5. The method of claim 1 or 2 wherein the outmost layer on said flat film has a scratch resistance property.

6. The method of claim 5 wherein a layer providing a polarization property is provided between said outmost layer and said top layer.

7. The method of claim 5 wherein a layer providing an antireflection property is provided between said outmost layer and said top layer.

8. The method of claim 5 wherein a layer providing a photochromic property is provided between said outmost layer and said top layer.

9. The method of claim 3 wherein said thermoplastic top layer is polycarbonate.