Method and apparatus for high-speed layer thickness curing in 3-D model making

• US 5,204,823 A
• Filed: 03/20/1991
• Issued: 04/20/1993
• Est. Priority Date: 03/20/1991
• Status: Expired due to Fees

• Current Assignee: CalComp, Inc. (Martin Marietta Corporation)
• Original Assignee: CalComp, Inc. (Martin Marietta Corporation)
• Inventors: Schlotterbeck, David L.
• Primary Examiner(s): Smith, Jerry
• Assistant Examiner(s): GORDON, PAUL P
• Application Number:
  US07/673,767
• Time in Patent Office: 762 Days
• Field of Search: 364/468, 364/473, 364/476, 364/477, 264/22, 264/139, 264/25, 425/163, 425/174.4, 425/142, 425/174.6
• US Class Current: 700/120
• CPC Class Codes: B29C 64/135 the energy source being concentrated, e.g. scanning lasers or focused light sources
• CPC Class Codes: B29K 2995/0073 smooth
• CPC Class Codes: G03F 7/0037 Production of three-dimensional images
• CPC Class Codes: G03F 7/70416 2.5D lithography

Abstract

This is a method and associated apparatus for creating a 3-dimensional model by curing a photocurable liquid polymer. The method comprises first placing a quantity of the photocurable liquid polymer in a container. A substrate upon which to build the model is then placed in the container and in the polymer. A knife member is positioned over the substrate with a bottom edge parallel to the substrate at a layer-spaced distance therefrom. The knife member is then moved over the substrate and parallel thereto from a starting side edge of the model to an opposite side edge of the model while a 1-dimensional pattern of light beams for curing the liquid polymer is simultaneously created and conducted to a line at and parallel to the bottom edge of the knife member and therefrom into the liquid polymer immediately behind the bottom edge of the knife member to cure a layer of the polymer and thereby form a layer of the model. The knife member is then raised over the layer just created so as to place the bottom edge parallel to that layer at a layer-spaced distance therefrom. This process is then repeating until the model had been formed in a line-by-line and layer-by-layer pattern from a bottom layer to a top layer.

Claims

1. Apparatus for curing a photocurable liquid polymer to create a 3-dimensional model comprising:

a) a container containing the photocurable liquid polymer;

b) a substrate upon which to build the model disposed in said container and in the polymer;

c) a knife member disposed over said substrate with a bottom edge parallel to said substrate;

d) movement means for moving said bottom edge of said knife member up and down with respect to said substrate and for moving said knife member over said substrate parallel thereto;

e) curing means for creating and conducting a 1-dimensional pattern of light beams for curing the liquid polymer to a line immediately behind and parallel to said bottom edge and therefrom into the liquid polymer; and

,

f) control means connected to said movement means for repeatedly moving said knife member over said substrate parallel thereto in a series of adjacent layers and connected to said curing means for simultaneously creating and conducting a series of 1-dimensional patterns of light beams into the liquid polymer to cure the liquid polymer in a line-by-line and layer-by-layer pattern from a bottom layer to a top layer.

2. The apparatus for curing a photocurable liquid polymer to create a 3-dimensional model of claim 1 wherein:

a) said knife member includes a 1-dimensional light pipe therein extending from a top edge thereof to said bottom edge; and

,

b) said curing means includes point-controlled, 1-dimensional light array means disposed along said top edge of said knife member for conducting individually-controlled sources of light beams into said 1-dimensional light pipe.

3. The apparatus for curing a photocurable liquid polymer to create a 3-dimensional model of claim 2 wherein:

said point-controlled, 1-dimensional light array means comprises a light source with a 1-dimensional light modulator disposed between said light source and said top edge of said knife member.

4. The apparatus for curing a photocurable liquid polymer to create a 3-dimensional model of claim 1 wherein:

said 1-dimensional light pipe extending from said top edge to said bottom edge is a self-focusing array including means for focusing light entering said top edge at said bottom edge.

5. The apparatus for curing a photocurable liquid polymer to create a 3-dimensional model of claim 1 wherein:

said curing means includes a laser source positioned to direct a modulatable laser beam into a vertical plane disposed immediately behind said knife member and extending from a top edge thereof to a point adjacent said bottom edge and scanning means for scanning said laser beam in said vertical plane along a series of adjacent 1-dimensional rows in each layer.

6. A method of creating a 3-dimensional model by curing a photocurable liquid polymer comprising the steps of:

a) placing a quantity of the photocurable liquid polymer in a container;

b) disposing a substrate upon which to build the model in the container and in the polymer;

c) disposing a knife member over the substrate with a bottom edge parallel to the substrate at a layer-spaced distance therefrom;

d) moving the knife member over the substrate and parallel thereto from a starting side edge of the model to an opposite side edge of the model while simultaneously creating and conducting a 1-dimensional pattern of light beams for curing the liquid polymer to a line at and parallel to the bottom edge and therefrom into the liquid polymer immediately behind the bottom edge to cure a layer of the polymer and thereby form a layer of the model;

e) raising the knife member over the layer created in step (d) to place the bottom edge parallel to that layer at a layer-spaced distance therefrom; and

,

f) repeating steps (d) and (e) until the model had been formed in a line-by-line and layer-by-layer pattern from a bottom layer to a top layer.

7. A system for creating 3-dimensional models by curing a photocurable liquid polymer comprising:

a) a container containing the photocurable liquid polymer;

b) a substrate upon which to build the model disposed in said container and in the polymer;

c) a knife member disposed over said substrate with a bottom edge parallel to said substrate;

d) movement means for moving said bottom edge of said knife member up and down with respect to said substrate and for moving said knife member over said substrate parallel thereto;

e) curing means for creating and conducting a 1-dimensional pattern of light beams for curing the liquid polymer to a line immediately behind and parallel to said bottom edge and therefrom into the liquid polymer;

f) movement control means connected to said movement means for repeatedly moving said knife member over said substrate parallel thereto in a series of adjacent layers; and

,

g) light control mean connected to said curing means for creating and conducting a series of 1-dimensional patterns of light beams into the liquid polymer to cure the liquid polymer as said knife member is moved over said substrate in said series of adjacent layers whereby a model is created by curing the liquid polymer in a line-by-line and layer-by-layer pattern from a bottom layer to a top layer.

8. The system of claim 7 wherein:

a) said knife member includes a 1-dimensional light pipe therein extending from a top edge thereof to said bottom edge; and

,

b) said curing means includes point-controlled, 1-dimensional light array means disposed along said top edge of said knife member for conducting individually-controlled sources of light beams into said 1-dimensional light pipe.

9. The system of claim 8 wherein:

said point-controlled, 1-dimensional light array means comprises a light source with a 1-dimensional light modulator disposed between said light source and said top edge of said knife member.

10. The system of claim 8 wherein:

said 1-dimensional light pipe extending from said top edge to said bottom edge is a self-focusing array including means for focusing light entering said top edge at said bottom edge.

11. The system of claim 7 wherein:

said curing means includes a laser source positioned to direct a modulatable laser beam into a vertical plane disposed immediately behind said knife member and extending from a top edge thereof to a point adjacent said bottom edge and scanning means for scanning said laser beam in said vertical plane along a series of adjacent 1-dimensional rows in each layer.

12. Peripheral apparatus for connection to a computer for creating 3-dimensional models by curing a photocurable liquid polymer in response to input commands from the computer comprising:

a) a container containing the photocurable liquid polymer;

b) a substrate upon which to build the model disposed in said container and in the polymer;

c) a knife member disposed over said substrate with a bottom edge parallel to said substrate;

d) movement means for moving said bottom edge of said knife member up and down with respect to said substrate and for moving said knife member over said substrate parallel thereto;

e) curing means for creating and conducting a 1-dimensional pattern of light beams for curing the liquid polymer to a line immediately behind and parallel to said bottom edge and therefrom into the liquid polymer;

f) movement control means connected to said movement means for moving said knife member over said substrate parallel thereto and up and down with respect to said substrate;

g) light control mean connected to said curing means for creating and conducting a 1-dimensional pattern of light beams into the liquid polymer to cure the liquid polymer; and

,

h) device control means connected to said movement means and said light control means and having input means for receiving control information from the computer for repeatedly moving said knife member over said substrate parallel thereto in a series of adjacent layers and for simultaneously inputting a series of 1-dimensional patterns of light beams into the liquid polymer as said knife member is moved over said substrate in said series of adjacent layers whereby a model is created by curing the liquid polymer in a line-by-line and layer-by-layer pattern from a bottom layer to a top layer according to information from the computer.

13. The computer peripheral apparatus of claim 12 wherein:

a) said knife member includes a 1-dimensional light pipe therein extending from a top edge thereof to said bottom edge; and

,

b) said curing means includes point-controlled, 1-dimensional light array means disposed along said top edge of said knife member for conducting individually-controlled sources of light beams into said 1-dimensional light pipe.

14. The computer peripheral apparatus of claim 13 wherein:

said point-controlled, 1-dimensional light array means comprises a light source with a 1-dimensional light modulator disposed between said light source and said top edge of said knife member.

15. The computer peripheral apparatus of claim 13 wherein:

said 1-dimensional light pipe extending from said top edge to said bottom edge is a self-focusing array including means for focusing light entering said top edge at said bottom edge.

16. The computer peripheral apparatus of claim 12 wherein:

said curing means includes a laser source positioned to direct a modulatable laser beam into a vertical plane disposed immediately behind said knife member and extending from a top edge thereof to a point adjacent said bottom edge and scanning means for scanning said laser beam in said vertical plane along a series of adjacent 1-dimensional rows in each layer.