Method of making a flexible lens

• US 5,932,151 A
• Filed: 09/29/1997
• Issued: 08/03/1999
• Est. Priority Date: 09/29/1997
• Status: Expired due to Fees

• Current Assignee: CareStream Health Incorporated
• Original Assignee: Imation Corporation (Glassbridge Enterprises, Inc.)
• Inventors: Schubert, Paul C.
• Primary Examiner(s): Vargot, Mathieu D.
• Application Number:
  US08/939,306
• Time in Patent Office: 673 Days
• Field of Search: 264/1.38, 264/1.7, 264/2.5, 264/1.1, 264/1.9, 425/808
• US Class Current: 264/1.38
• CPC Class Codes: B29C 31/042 using dispensing heads, e.g. extruders, placed over or apart from the moulds positioning extruded preforms on conveyors B29C31/085
• CPC Class Codes: B29C 35/0888 using transparant moulds
• CPC Class Codes: B29D 11/00009 Production of simple or compound lenses
• CPC Class Codes: B29D 11/00432 Auxiliary operations, e.g. machines for filling the moulds B29D11/00125 takes precedence
• CPC Class Codes: B29D 11/0048 Moulds for lenses moulds for plastic articles in general B29C33/00
• CPC Class Codes: B29D 11/00855 Producing cylindrical lenses
• CPC Class Codes: Y10S 425/808 Lens mold

Abstract

A method of making a long, thin, flexible lens. The method comprises the steps of providing a mold having a top surface shape corresponding to a desired lens shape. A curable optical material is dispenses onto the top surface. A thin, flexible structural layer is placed onto the top surface, over the curable optical material to form a mold assembly. The mold assembly is cured. The flexible lens is removed from the mold top surface. The flexible lens is capable of flexing in at least a 180° arc while maintaining its diffraction limited optical characteristics.

Claims

1. A method of making a long, flexible cylinder lens having diffraction limited optical characteristics, the method comprising the steps of:

providing a mold having a top surface shaped corresponding to a desired lens shape, wherein the desired lens shape forms a cylinder lens surface;

dispensing a curable optical material onto the top surface;

placing a long, thin, flexible structural layer onto the top surface, over the curable optical material to form a mold assembly;

curing, the mold assembly; and

removing the flexible lens from the mold top surface, wherein the flexible lens is capable of being flexed into at least a 180°

arc while maintaining its diffraction limited optical characteristics.

2. The method of claim 1, further comprising the step of coating the top surface of the mold with a non-stick coating.

3. The method of claim 1, wherein the step of dispensing a curable optical material onto the top surface further comprises the step of dispensing discrete droplets of curable optical material onto the mold top surface.

4. The method of claim 1, wherein the step of curing the mold assembly further comprises the steps of:

providing a ultra-violet light source; and

positioning the ultra-violet light source over the mold assembly.

5. The method of claim 4, wherein the curable optical material is a photopolymer.

6. The method of claim 1, wherein the thin, flexible structural layer is made of a polymeric material.

7. The method of claim 1, wherein the thin, flexible structural layer is made of glass.

8. The method of claim 1, further comprising the steps of:

dispensing a curable optical material onto the mold assembly;

placing a second mold having a bottom surface corresponding to a desired lens shape onto the thin, flexible structural layer, over the curable optical material to form a second mold assembly;

curing the second mold assembly; and

removing the lens from the second mold assembly.

9. The method of claim 8, wherein the step of dispensing a curable optical material onto the mold assembly further comprises the step of dispensing discrete droplets of the curable optical material onto the mold assembly.

10. The method of claim 1, wherein the flexible lens is a plano-convex cylinder lens having diffraction limited optical characteristics.

11. A method of making a long, thin, flexible lens having two formed lens surfaces, the flexible lens having diffraction limited optical characteristics, wherein the lens is at least several inches in length and is capable of being wrapped about a cylindrically shaped guide member, the method comprising the steps of:

providing a first mold having a first mold surface which is shaped corresponding to a desired lens surface shape;

dispensing a photopolymer onto the first mold surface;

placing a long, thin, flexible structural member constructed of a polymeric material onto the first mold surface, over the photopolymer to form a first mold assembly;

curing the first mold assembly to a desired degree;

dispensing a photopolymer onto the first mold assembly;

placing a second mold having a second mold surface onto the first mold assembly over the photopolymer to form a final mold assembly;

curing the final mold assembly; and

removing the long, thin, flexible lens from the final mold assembly, wherein the flexible lens is capable of being flexed into at least a 180°

arc while maintaining its diffraction limited optical characteristics.

12. The method of claim 11, further comprising the step of coating the first mold surface with a non-stick coating.

13. The method of claim 11, further comprising the step of coating the second mold surface with a non-stick coating.

14. The method of claim 11, wherein the step of dispensing a photopolymer onto the first mold surface further comprises the step of dispensing discrete droplets of curable optical material onto the first mold surface.

15. The method of claim 14, wherein the discrete droplets dispensed onto the first mold surface are dispensed such that they do not contact each other.

16. The method of claim 11, wherein the step of dispensing a photopolymer onto the second mold surface further comprises the step of dispensing discrete droplets of curable optical material onto the second mold surface.

17. The method of claim 16, wherein the discrete droplets are dispensed onto the second mold surface such that they do not touch each other.

18. The method of claim 11, wherein the step of curing the first mold assembly to a desired degree further comprises the steps of:

providing an ultra-violet light source; and

positioning the ultra-violet light source over the second mold assembly.

19. The method of claim 11, wherein the step of curing the second mold assembly further comprises the steps of:

providing an ultra-violet light source; and

positioning the ultra-violet light source over the mold assembly.

20. The method of claim 11, further wherein the polymeric material is polyester.

21. The method of claim 11, further wherein the polymeric material is polycarbonate.