Injection molding apparatus, injection molding method and production method of molded product using injection molding apparatus, and laminated lens

Patent metadata

Field	Value
Publication number	US-12064908-B2
Application number	US-202017610466-A
Country	US
Kind code	B2
Filing date	May 15, 2020
Priority date	May 16, 2019
Publication date	Aug 20, 2024
Grant date	Aug 20, 2024

Abstract

An injection molding apparatus includes a substantially circular first substrate, a substantially circular second substrate disposed to face a surface of the first substrate, a fixing member which fixes a peripheral end portion of the first substrate and a peripheral end portion of the second substrate, and an injection portion which is provided in the fixing member and from which a composition is injected into a gap between the first substrate and the second substrate, in which a space connecting with the injection portion and the gap is provided in at least a part of a periphery of the gap, and a width of the space in a thickness direction is larger than a width of the gap in the thickness direction.

First claim

The invention claimed is:

1. An injection molding apparatus comprising:
a substantially circular first substrate;
a substantially circular second substrate disposed to face a surface of the first substrate;
a fixing member which fixes a peripheral end portion of the first substrate and a peripheral end portion of the second substrate;
a gap formed by entire opposing surfaces of the first substrate and the second substrate;
an injection portion which is provided in the fixing member; and
a space connecting with the injection portion and the gap is provided in at least a part of a periphery of the gap;
wherein a width of the space in a thickness direction is larger than a width of the gap in the thickness direction,
the width of the gap in the thickness direction is substantially the same through the entire gap, and
the injection portion injects a composition into the space.

2. The injection molding apparatus according to claim 1 ,
wherein the space is provided over a substantially half of a circumference of the periphery of the gap.

3. The injection molding apparatus according to claim 1 ,
wherein the space is provided over an entire periphery of the gap.

4. The injection molding apparatus according to claim 1 ,
wherein the width of the gap in the thickness direction is 0.05 to 2 mm.

5. The injection molding apparatus according to claim 1 ,
wherein the first substrate is a mold substrate having a forming surface for forming an objective surface of a lens, which is located on a second substrate side, and
the second substrate is a resin substrate.

6. The injection molding apparatus according to claim 1 ,
wherein the first substrate and the second substrate are mold substrates.

7. The injection molding apparatus according to claim 1 ,
wherein a notch is provided in at least one of a periphery of the first substrate and a periphery of the second substrate, and
the notch forms the space.

8. The injection molding apparatus according to claim 1 ,
wherein the second substrate is a resin substrate,
a notch is provided over an entire circumference of a periphery of the second substrate, and
the notch forms the space.

9. The injection molding apparatus according to claim 1 ,
wherein the surface of the first substrate is a curved surface,
the gap is provided between the surface and a curved surface of the second substrate facing the surface,
at least one of the curved surface of the first substrate and the curved surface of the second substrate has a radius of curvature of at least a part of the curved surface of a periphery thereof smaller than a radius of curvature of the curved surface surrounded by the periphery, and
the space is formed in at least a part of the periphery of the gap.

10. The injection molding apparatus according to claim 1 ,
wherein the second substrate is a resin substrate,
the surface of the first substrate is a curved surface,
the gap is provided between the surface and a curved surface of the second substrate facing the surface,
a radius of curvature of an entire circumference of a periphery of the second substrate is smaller than a radius of curvature of the curved surface surrounded by the periphery, and
the space is formed in the periphery of the gap.

11. The injection molding apparatus according to claim 1 ,
wherein the fixing member is a tape or a gasket.

12. An injection molding method of a composition,
wherein the injection molding apparatus according to claim 1 is disposed such that the injection portion is positioned above, and
the injection molding method comprises:
a step of injecting the composition from the injection portion into the space; and
a step of filling the gap with the composition through the space.

13. The injection molding method of a composition according to claim 12 ,
wherein in the step of injecting the composition, a viscosity of the composition is 5 to 1000 mPa·s.

14. The injection molding method according to claim 12 ,
wherein the second substrate is a resin substrate,
the resin substrate is a thiourethane resin consisting of an isocyanate compound and a thiol compound, and
the composition includes the isocyanate compound and the thiol compound,
wherein the isocyanate compound is at least one selected from xylylene diisocyanate, phenylene diisocyanate, tolylene diisocyanate, diphenylmethane diisocyanate, 2,5-bis(isocyanatomethyl)bicyclo-[2.2.1]-heptane, 2,6-bis(isocyanatomethyl)bicyclo-[2.2.1]-heptane, hexamethylene diisocyanate, pentamethylene diisocyanate, isophorone diisocyanate, bis(isocyanatomethyl)cyclohexane, and dicyclohexylmethane diisocyanate, and
wherein the thiol compound is at least one selected from the group consisting of 5,7-dimercaptomethyl-1,11-dimercapto-3,6,9-trithiaundecane, 4,7-dimercaptomethyl-1,11-dimercapto-3,6,9-trithiaundecane, 4,8-dimercaptomethyl-1,11-dimercapto-3,6,9-trithiaundecane, 4-mercaptomethyl-1,8-dimercapto-3,6-dithiaoctane, and pentaerythritol tetrakis(3-mercaptopropionate).

15. The injection molding method according to claim 14 ,
wherein the isocyanate compound and the thiol compound constituting the resin substrate are the same as the isocyanate compound and the thiol compound contained in the composition, respectively.

16. A production method of a molded product,
wherein the injection molding apparatus according to claim 1 is disposed such that the injection portion is positioned above, and
the production method comprises:
a step of injecting the composition from the injection portion into the space;
a step of filling the gap with the composition through the space; and
a step of curing the composition.

17. The production method of a molded product according to claim 16 ,
wherein in the step of injecting the composition, a Viscosity of the composition is 5 to 1000 mPa·s.

18. The production method of a molded product according to claim 16 ,
wherein the second substrate is a resin substrate,
the resin substrate is a thiourethane resin consisting of an isocyanate compound and a thiol compound, and
the composition includes the isocyanate compound and the thiol compound,
wherein the isocyanate compound is at least one selected from xylylene diisocyanate, phenylene diisocyanate, tolylene diisocyanate, diphenylmethane diisocyanate, 2,5-bis(isocyanatomethyl)bicyclo-[2.2.1]-heptane, 2,6-bis(isocyanatomethyl)bicyclo-[2.2.1]-heptane, hexamethylene diisocyanate, pentamethylene diisocyanate, isophorone diisocyanate, bis(isocyanatomethyl)cyclohexane, and dicyclohexylmethane diisocyanate, and
wherein the thiol compound is at least one selected from the group consisting of 5,7-dimercaptomethyl-1,11-dimercapto-3,6,9-trithiaundecane, 4,7-dimercaptomethyl-1,11-dimercapto-3,6,9-trithiaundecane, 4,8-dimercaptomethyl-1,11-dimercapto-3,6,9-trithiaundecane, 4-mercaptomethyl-1,8-dimercapto-3,6-dithiaoctane, and pentaerythritol tetrakis(3-mercaptopropionate).

19. The production method of a molded product according to claim 18 ,
wherein the isocyanate compound and the thiol compound constituting the resin substrate are the same as the isocyanate compound and the thiol compound contained in the composition, respectively.

Assignees

• Mitsui Chemicals Inc

Inventors

• Kawaguchi Masaru
• Ito Shinsuke
• Suesugi Kouji

Classifications

• B29L2011/0016

  Lenses · CPC title

• B29K2995/0097

  Thickness · CPC title

• B29K2105/0094

  having particular viscosity · CPC title

• B29K2909/08

  Glass · CPC title

• B29C2045/0094

  injection moulding of small-sized articles, e.g. microarticles, ultra thin articles · CPC title