Stereolithographic method and apparatus in which a membrane separates phases

• US 5,011,635 A
• Filed: 05/18/1989
• Issued: 04/30/1991
• Est. Priority Date: 05/18/1989
• Status: Expired due to Fees

• Current Assignee: DSM Resins BV (DSM-Firmenich AG)
• Original Assignee: DeSoto, Inc. (Overstock.com Incorporated)
• Inventors: Ansel, Robert E., Murphy, Edward J., Krajewski, John J.
• Primary Examiner(s): Thurlow, Jeffery
• Assistant Examiner(s): Tentoni, Leo B.
• Application Number:
  US07/353,538
• Time in Patent Office: 712 Days
• Field of Search: 264/22, 264/129, 264/236, 264/255, 264/298, 264/308, 264/347, 425/174, 425/174.4, 425/215, 427/53.1, 427/54.1, 427/393.5, 118/402, 118/428, 118/429, 118/620, 118/403, 118/423, 156/275.5, 156/307.1, 156/379.6, 156/272.8, 250/432 R, 250/492.1
• US Class Current: 264/401
• CPC Class Codes: B29C 64/135 the energy source being concentrated, e.g. scanning lasers or focused light sources
• CPC Class Codes: B33Y 10/00 Processes of additive manufacturing

Abstract

The present invention contemplates a stereolithographic apparatus and method having a liquid organic phase and a fluid phase separated by a membrane that inhibits contact between the phases.

Claims

1. An apparatus for producing a three-dimensional object comprising means for containing a fluid phase positioned therein, a substantially impermeable, movable membrane positioned on top of the fluid phase in said first recited means, a radiation-polymerizable liquid organic phase positioned in the containing means on top of the membrane such that contact of the phase is inhibited, a radiation source positioned above the liquid organic phase adapted to radiate the liquid organic phase to form a polymerized organic layer, movable support means and means for forming and combining successive adjacent polymerized organic layers to form a three-dimensional object.

2. The apparatus in accordance with claim 1 wherein the organic phase has an upper surface and wherein said support means is initially positioned in the liquid organic phase just below the upper surface.

3. The apparatus in accordance with claim 1 wherein at least a segment of the membrane is rigid.

4. The apparatus in accordance with claim 3 wherein the membrane is the support means.

5. The apparatus in accordance with claim 1 further comprising a relief means in communication with the fluid phase.

6. A method of producing a three-dimensional object comprising the steps of:

(a) providing a fluid phase in a container;

(b) providing a substantially impermeable, movable membrane positioned on top of the fluid phase;

(c) providing a radiation-polymerizable liquid organic phase positioned on top of the membrane, the liquid organic phase having an upper surface;

(d) providing a radiation source positioned above the upper surface;

(e) exposing at least a portion of the upper surface to radiation in an amount effective to at least partially polymerize the liquid organic phase at and just below the upper surface to form an at least partially polymerized organic layer;

(f) covering the at least partially polymerized organic layer with additional liquid organic phase, the additional liquid organic phase having an upper surface;

(g) exposing at least a portion of the upper surface to radiation in an amount effective to at least partially polymerize the additional liquid organic phase at and just below the upper surface to form another at least partially polymerized organic layer; and

(h) repeating steps (f) and (g) to form a three-dimensional object.

7. The method in accordance with claim 6 wherein at least one of the fluid phase and the organic phase includes a constituent soluble in the other phase.

8. The method in accordance with claim 7 further comprising lowering the membrane with respect to the upper surface to cover an at least partially polymerized organic layer with additional liquid organic phase.

9. The method in accordance with claim 6 wherein at least a segment of the membrane is rigid.

10. The method in accordance with claim 9 wherein the membrane is a support means to which the polymerized organic layer adheres to, and becomes part of, upon polymerization.

11. The method in accordance with claim 6 further comprising the step of:

(d) providing movable support means positioned immediately beneath the upper surface and above said movable membrane so that the at least partially polymerized organic layer adheres to, and becomes part of the movable support means upon polymerization.

12. The method in accordance with claim 11 wherein at least one of the fluid phase and the organic phase includes a constituent that is soluble in the other phase.

13. The method in accordance with claim 11 further comprising lowering the support means and membrane simultaneously with respect to the upper surface to cover an at least partially polymerized organic layer with additional liquid organic phase.

14. The method in accordance with claim 11 wherein at least a segment of the membrane is rigid.