Method of making a spectacle lens

Patent metadata

Field	Value
Publication number	US-9738040-B2
Application number	US-201414530465-A
Country	US
Kind code	B2
Filing date	Oct 31, 2014
Priority date	Oct 31, 2013
Publication date	Aug 22, 2017
Grant date	Aug 22, 2017

Abstract

A method for making a spectacle lens includes joining a mold and a sealing ring. The mold has an integrated block piece and a mold shell made by primary shaping and the sealing ring has a first end face, a second end face, a peripheral seal, an opening disposed on the first end face configured to receive a mold, and a flexible membrane on the second end face. A polymerizable material is introduced into the mold cavity with the aid of a pump action of the flexible membrane of the sealing ring. The flexible membrane of the sealing ring is fixed in a desired surface shape and the polymerization is carried out. The mold is removed with a cast-on spectacle lens blank.

First claim

What is claimed is:

1. A method for making a spectacle lens, the method comprising the steps of:
joining a mold and a sealing ring, the mold having an integrated block piece and a mold shell made by primary shaping and the sealing ring having a first end face, a second end face, a peripheral seal, an opening disposed on the first end face configured to receive a mold, and a flexible membrane on the second end face with the sealing ring and the mold shell conjointly defining a mold cavity;
introducing a polymerizable material into the mold cavity with the aid of a pump action of the flexible membrane of the sealing ring;
fixing the flexible membrane of the sealing ring in a desired surface shape;
carrying out the polymerization in the mold cavity; and,
removing the mold with a cast-on spectacle lens blank.

2. The method of claim 1 further comprising the step of performing finishing steps for making a finished spectacle lens.

3. The method of claim 1 further comprising the step of performing prescription grinding for making a finished spectacle lens.

4. The method of claim 1 , wherein said fixing the flexible membrane of the sealing ring in a desired surface shape is done via a shaping-inputting element.

5. The method of claim 4 , wherein said shaping-inputting element is a spring tension element.

6. The method of claim 1 further comprising the step of performing finishing steps, at least partially, while the spectacle lens blank remains in the mold and while using the integrated block piece.

7. The method of claim 2 , wherein the spectacle lens blank is made with a surface allowance of at most 10 mm.

8. The method of claim 1 , wherein the spectacle lens blank is made with a surface allowance lying in a range of 0.2 to 5 mm.

9. The method of claim 2 , wherein said performing finishing steps results in a material removal of at most 20%.

10. The method of claim 1 , wherein the mold shell is formed by injection molding or 3D printing.

11. The method of claim 2 , wherein the sealing ring has at least an inlet channel and an outlet channel for casting compositions in the region of the peripheral seal.

12. The method of claim 11 , wherein the inlet/outlet channels can be squeezed shut.

13. The method of claim 11 , wherein the method step of introducing a polymerizable material into the mold cavity includes:
inserting the arrangement of the mold and the sealing ring into a pump mechanism via which the flexible membrane can be subjected to at least one of underpressure and overpressure;
pumping out the mold cavity so as to remove air;
filling the mold cavity with monomer by generating underpressure via the pump mechanism and stretching the flexible membrane; and,
closing the outlet channel and the inlet channel.

14. The method of claim 11 , wherein the method step of introducing a polymerizable material into the mold cavity includes:
inserting the arrangement of the mold and the sealing ring into a pump mechanism via which the flexible membrane can be subjected to at least one of underpressure and overpressure;
pumping out the mold cavity so as to remove air;
filling the mold cavity with monomer by generating underpressure via the pump mechanism and stretching the flexible membrane;
pressing out excess monomer and, if required, any air bubbles still present; and,
closing the outlet channel and the inlet channel.

15. The method of claim 1 , wherein the sealing ring is configured to receive a mold in different positions in such a manner that mold cavities having different edge heights are generated.

16. The method of claim 1 , wherein the sealing ring has, on the inner circumference of the peripheral seal, an arrangement for fixing a mold in at least one defined depth dimension.

17. A method for making a spectacle lens, the method comprising the steps of:
joining a mold and a sealing ring, the mold having an integrated block piece and a mold shell made by primary shaping and the sealing ring having a first end face, a second end face, a peripheral seal, an opening disposed on the first end face configured to receive a mold, and a flexible membrane on the second end face with the sealing ring and the mold shell conjointly defining a mold cavity;
introducing a polymerizable material into the mold cavity with the aid of a pump action of the flexible membrane of the sealing ring;
fixing the flexible membrane of the sealing ring in a desired surface shape;
carrying out the polymerization in the mold cavity;
removing the mold with a cast-on spectacle lens blank; and,
wherein the spectacle lens blank is made with a surface allowance of at most 10 mm.

18. A method for making a spectacle lens, the method comprising the steps of:
joining a mold and a sealing ring, the mold having an integrated block piece and a mold shell made by primary shaping and the sealing ring having a first end face, a second end face, a peripheral seal, an opening disposed on the first end face configured to receive a mold, and a flexible membrane on the second end face with the sealing ring and the mold shell conjointly defining a mold cavity and wherein the sealing ring has at least an inlet channel and an outlet channel for casting compositions in the region of the peripheral seal;
introducing a polymerizable material into the mold cavity with the aid of a pump action of the flexible membrane of the sealing ring by:
(i) inserting the arrangement of the mold and the sealing ring into a pump mechanism via which the flexible membrane can be subjected to at least one of underpressure and overpressure; and,
(ii) pumping out the mold cavity so as to remove air;
fixing the flexible membrane of the sealing ring in a desired surface shape;
carrying out the polymerization in the mold cavity;
removing the mold with a cast-on spectacle lens blank;
filling the mold cavity with monomer by generating underpressure via the pump mechanism and stretching the flexible membrane;
pressing out excess monomer and, if required, any air bubbles still present; and,
closing the outlet channel and the inlet channel.

Assignees

• Zeiss Carl Vision Int Gmbh

Inventors

• Meschenmoser Ralf
• Kurz Norbert
• Riedel Malte
• Duewel Stephan

Classifications

• B29C45/0055

  Shaping · CPC title

• B29D11/00538

  Feeding arrangements · CPC title

• B29D11/00009 Primary

  Production of simple or compound lenses · CPC title

• B29L2011/0016

  Lenses · CPC title

• B29D11/00548

  with surfaces formed by films · CPC title