Static liquid interface production of lenses and other contoured objects

Patent metadata

Field	Value
Publication number	US-11440223-B2
Application number	US-201916526071-A
Country	US
Kind code	B2
Filing date	Jul 30, 2019
Priority date	Jul 31, 2018
Publication date	Sep 13, 2022
Grant date	Sep 13, 2022

Abstract

An apparatus useful for rapidly producing at least one object having a contoured surface portion from a light-polymerizable resin is provided. The apparatus includes (a) a window containing an inhibitor of polymerization, on which window a coating of light polymerizable resin can be placed, with the inhibitor of polymerization forming a first dead zone of unpolymerizable resin in the light polymerizable resin; (b) a polymerizing light source operatively associated with the window and positioned for projecting polymerizing light through the window; (c) a controller operatively associated with said light source and configured to pattern and project said polymerizing light at a first light dosage sufficient to form the object in the resin under stationary conditions, while spatially modulating the first light dosage so that the first dead zone is spatially contoured in thickness, to produce a first contoured surface portion on each object, which first contoured surface portion is in contact with the first dead zone of unpolymerizable resin.

First claim

We claim:

1. An apparatus useful for producing at least one object having a contoured surface portion from a light polymerizable resin, said apparatus comprising:
(a) a window containing an inhibitor of polymerization, on which window a coating of the light polymerizable resin can be placed, with said inhibitor of polymerization forming a first dead zone of unpolymerizable resin in the light polymerizable resin;
(b) a polymerizing light source operatively associated with said window and positioned for projecting polymerizing light through said window; and
(c) a controller operatively associated with said light source and configured to pattern and project said polymerizing light at a first light dosage sufficient to form the object in the light polymerizable resin under stationary conditions, while spatially modulating the first light dosage so that the first dead zone is spatially contoured in thickness, to produce a first contoured surface portion on each said object, which first contoured surface portion is in contact with the first dead zone of unpolymerizable resin,
wherein the window comprises a first window, the apparatus further comprising a second window facing said first window and configured for contacting said light polymerizable resin, said second window containing said inhibitor of polymerization.

2. The apparatus of claim 1 , wherein said inhibitor of polymerization comprises oxygen.

3. The apparatus of claim 1 , wherein said first window comprises a fluoropolymer.

4. The apparatus of claim 1 , wherein said second window comprises a fluoropolymer.

5. The apparatus of claim 1 , further comprising a second polymerizing light source operatively associated with said second window and positioned for projecting polymerizing light through said second window.

6. The apparatus of claim 1 , wherein said first window, and optionally said second window, comprises a light responsive polymer layer configured for contacting said light polymerizable resin.

7. The apparatus of claim 1 , further comprising:
a probe light source configured for projecting probe light through said object; and
a detector configured for detecting said probe light having passed through said object;
with said controller configured to modify said polymerizing light in response to deviations in said probe light from that expected to be imparted to said detector on passing through said object to correct potential distortions in said object.

8. A method of producing at least one object having a contoured surface portion, comprising:
(a) providing a first window containing an inhibitor of polymerization,
(b) coating said first window with a light polymerizable resin under conditions in which said inhibitor passes into a portion of said light polymerizable resin and thereby forms a first dead zone of unpolymerizable resin contacting said first window;
(c) exposing said light polymerizable resin to patterned polymerizing light through said first window at a first light dosage sufficient to form said object in said light polymerizable resin under stationary conditions, while
(d) spatially modulating said first light dosage so that said first dead zone is spatially contoured in thickness to produce a first contoured surface portion on each said object, which the first contoured surface portion is in contact with said first dead zone of unpolymerizable resin,
(e) contacting a second window to said resin in a position opposing said first window, said second window containing an inhibitor of polymerization, under conditions in which said inhibitor of said second window passes into a portion of said light polymerizable resin and forms a second dead zone of unpolymerizable resin contacting said second window; and
(f) further exposing said light polymerizable resin to patterned polymerizing light through said second window at a second light dosage sufficient to further form said object in said light polymerizable resin under stationary conditions; while
(g) spatially modulating said second light dosage so that said second dead zone is spatially contoured in thickness to produce a second contoured surface portion on said object, which said second contoured surface portion is in contact with said second dead zone of unpolymerizable resin.

9. The method of claim 8 , further comprising:
contacting a substrate to said resin facing said first window; and
producing said objects adhered to said substrate while said substrate and said window remain stationary; and then
separating said objects from said substrate.

10. The method of claim 8 , wherein said exposing step is carried out with:
(i) a single pulse of patterned polymerizing light, which pulse is spatially modulated in intensity, duration, or a combination thereof, or
(ii) a plurality of pulses of patterned polymerizing light, which pulses are spatially modulated in intensity, duration, frequency, or a combination thereof; or
(iii) a focused beam of polymerizing light, which the focused beam is optionally focused on an edge portion of object during production thereof.

11. The method of claim 8 , wherein said first window, and optionally said second window, comprises a light responsive polymer layer configured for contacting said light polymerizable resin, and optionally wherein said method further comprises exposing each said light responsive polymer layers of said first window and said second window to patterned controlling light to selectively contour the first contoured surface and the second contoured surface respectively.

12. The method of claim 8 , further comprising:
further exposing said object to probe light during said exposing step (c);
detecting said probe light after having passed through said object; and
modifying said polymerizing light through said first window in response to deviations in said probe light from that expected to be imparted to said detector on passing through said object to correct potential distortions in said object during said exposing step (c).

13. The method of claim 8 , wherein said first window and said second window, comprise an oxygen-permeable polymer.

14. The method of claim 8 , wherein said at least one object comprises a plurality of separate objects produced concurrently with one another.

15. The method of claim 8 , wherein each said object comprises a lens.

16. The method of claim 8 , wherein each said object comprises an optically transparent polymer.

Assignees

• Carbon Inc

Inventors

• Panzer Matthew
• Tumbleston John R

Classifications

• B29C35/0288 Primary

  Controlling heating or curing of polymers during moulding, e.g. by measuring temperatures or properties of the polymer and regulating the process (controlling or regulating chemical, physical or physico- chemical processes in general B01J19/0006) · CPC title

• B29D11/00432

  Auxiliary operations, e.g. machines for filling the moulds (B29D11/00125 takes precedence) · CPC title

• B29D11/00365

  Production of microlenses (lenticular sheets B29D11/00278) · CPC title

• B29C64/124

  using layers of liquid which are selectively solidified · CPC title

• B33Y30/00

  Apparatus for additive manufacturing; Details thereof or accessories therefor · CPC title