Apparatus for forming a three-dimensional reproduction of an object from laminations

• US 5,127,037 A
• Filed: 08/15/1990
• Issued: 06/30/1992
• Est. Priority Date: 08/15/1990
• Status: Expired due to Fees

• Current Assignee: David K. Bynum
• Original Assignee: David K. Bynum
• Inventors: Bynum, David K.
• Primary Examiner(s): Howell, Janice A.
• Assistant Examiner(s): CHU, KIM KWOK
• Application Number:
  US07/567,719
• Time in Patent Office: 685 Days
• Field of Search: 378/4, 378/901, 378/95, 378/98, 378/162, 364/425, 364/474.24, 364/413.25, 364/474.03, 364/413.19, 364/413.15, 364/413.14
• US Class Current: 378/4
• CPC Class Codes: B33Y 30/00 Apparatus for additive manufacturing; Details thereof or accessories therefor
• CPC Class Codes: B33Y 50/02 for controlling or regulating additive manufacturing processes
• CPC Class Codes: H05G 1/26 Measuring, controlling or protecting measuring X-ray radiation G01T
• CPC Class Codes: Y10S 378/901 Computer tomography program or processor

Abstract

An object replicator that replicates the physical form of an object in a polymer or the like by employing a Computed Tomography scanner or a Magnetic Resonance Imaging system, to digitize the physical features of the object to be copied. This data is used to form an electronic three-dimensional representation of the object. The electronic representation is then sectioned and provided to a three-dimensional printer to replicate a copy of those features by sequentially forming and joining laminae corresponding to the sections, to build up a physical replication of the object in a step-wise fashion whereby the three dimensional object is auto-matically formed from a composite of laminae.

Claims

1. An apparatus for forming a three-dimensional reproduction of an object from laminations comprising:

a. a non-invasive data acquisition means that discerns the exterior and interior structure of said object, said data acquisition means creates electronic sections that represent planar slices of said object;

b. a three-dimensional printing means whereby said planar slices of said object are manufactured as laminae and joined to create a three-dimensional replica of said object, said three-dimensional printing means comprising;

(1) means for receiving the electronic sectional data corresponding to an electronic representation of said object;

(2) means for exposing a charged electro-photographic element with an electro-magnetic radiation pattern corresponding to said electronic sectional data to form a two dimensional electro-static latent image on said electro-photographic element;

(3) means for applying a plurality of forming powders to said two dimensional electro-static latent image contained on said electro-photographic element to form a physical layer of lamina;

(4) means for transferring said physical layer of lamina to an intermediate support;

(5) means for causing said physical layer of lamina to become tacky;

(6) means for transferring and bonding said physical layer of lamina to previously formed laminae and building up a physical replication of said object in a step-wise fashion whereby the three dimensional object is automatically formed from a composite of laminae.

2. The apparatus as set forth in claim 1 wherein said means for causing said physical layer of lamina to become tacky is induction heating, whereby said plurality of forming powders are deposited in separate adjacent areas to form said physical layer of lamina, the forming powders comprising said separate adjacent areas, each of a different thermal melting point, each comprising a plurality of finely divided metal flakes dispersed therein, said forming powders of a relatively higher thermal melting point containing a proportionately higher percentage of said metal flakes than said forming powders of a relatively lower thermal melting point, whereby the induction heating means by induction heating of said metal flakes induces more rapid heating in said forming powders comprised of said higher percentage of said metal flakes causing all of said forming powders comprising said separate adjacent areas to reach their respective melting points and thus to become tacky substantially at the same time.

3. The apparatus according to claim 1 wherein said non-invasive data acquisition means is a computed tomography scanner comprising:

a. a source means for generating penetrating radiation such as X-ray or gamma radiation;

b. a penetrating radiation detection means including a plurality of detector elements forming a plurality of radiation collection points, said detector elements positioned to intercept said penetrating radiation after having passed through the object to be replicated, the radiation detector means generating projection data for each of said detection points corresponding to an intensity of said penetrating radiation beam transmitted through said object and incident on said radiation detector elements for each of said detection points;

c. a motive means for rotating said source means for generating penetrating radiation, relative to said object to be replicated, said motive means generating a position signal representing a relative rotational position;

d. a data receiving means, responsive to said position signal from said motive means, for sampling said projection data from said penetrating radiation detecting means;

e. a reconstruction processing means for reconstructing the projection data acquired by said data receiving means to form a tomographic image of said object.

4. The apparatus according to claim 1 wherein said non-invasive data acquisition means is a magnetic resonance imaging apparatus.

5. An apparatus for forming a three-dimensional reproduction of an object from laminations comprising:

a. a non-invasive data acquisition means that discerns the exterior and interior structure of said object, said data acquisition means creates an electronic three-dimensional representation of said object;

b. an electronic sectioning processing means wherein said electronic three-dimensional representation of said object is electronically sectioned into plural parallel planar sections;

c. a three-dimensional printing means whereby said plural parallel planar sections of said electronic three-dimensional representation of said object are sequentially manufactured as laminae and joined to create a three-dimensional replica of said object, said three-dimensional printing means comprising;

(1) means for deriving graphic image data output from the data acquisition means, said graphic image data defining successive adjacent cross-sections of the three-dimensional object to be replicated;

(2) means for exposing a charged electro-photographic element with an electro-magnetic radiation pattern corresponding to said graphic image data, to form a two dimensional electro-static latent image on said electro-photographic element;

(3) means for applying a plurality of forming powders to said two dimensional electro-static latent image contained on said electro-photographic element to form a physical layer of lamina;

(4) means for moving said lamina relative to the forming means;

(5) means for causing said physical layer of lamina to become tacky;

(6) means for transferring said physical layer of lamina to previously formed laminae;

(7) means for joining said laminae as they are formed and building up a physical replication of said object in a step-wise fashion whereby the three-dimensional object is automatically formed from a composite of laminae.

6. The apparatus of claim 5 wherein said non-invasive data acquisition means is a computed tomography scanner.

7. The computed tomography scanner of claim 6 comprising:

a. penetrating radiation source for generating a penetrating radiation fan beam;

b. driving means for rotating said penetrating radiation fan beam relative to an object to be replicated in a plane in which said penetrating radiation fan beam exists, said driving means generating a position signal representing a relative rotational position;

c. stationary penetrating radiation detecting means including a plurality of detector elements which are concentric with a rotational orbit of said penetrating radiation source, a plurality of detection points of said detector elements being arranged at equal angular intervals, said stationary penetrating radiation detecting means generating projection data for each of said detection points corresponding to an intensity of the penetrating radiation, for each of said detection points;

d. data receiving means, responsive to the position signal from said driving means, for sampling said projection data from said penetrating radiation detecting means at co-angular sampling points relative to the rotation of said penetrating radiation beam;

e. reconstruction processing means for reconstructing the projection data acquired by said data acquisition means to form a tomographic image of the object.

8. The computed tomography scanner of claim 7 wherein the penetrating radiation is X-ray radiation.

9. The computed tomography scanner of claim 7 wherein the penetrating radiation is gamma radiation.

10. The apparatus of claim 5 wherein said non-invasive data acquisition means is a magnetic resonance imaging apparatus.

11. The apparatus as set forth in claim 5 wherein said means for causing said physical layer of lamina to become tacky is means for induction heating, whereby said plurality of forming powders are deposited in separate adjacent areas to form said physical layer of lamina, the forming powders comprising said separate adjacent areas, each of a different thermal melting point, each comprising a plurality of finely divided metal flakes dispersed therein, said forming powders of a relatively higher thermal melting point containing a proportionately higher percentage of said metal flakes than said forming powders of a relatively lower thermal melting point, whereby the induction heating means by induction heating of said metal flakes induces more rapid heating in said forming powders comprised of said higher percentage of said metal flakes causing all of said forming powders comprising said separate adjacent areas to reach their respective melting points and thus to become tacky substantially at the same time.

12. An apparatus for forming a three-dimensional reproduction of an object from laminations comprising:

a. a non-invasive data acquisition means that discerns the exterior and interior structure of an object, said data acquisition means creates electronic sections that represent planar slices of said object;

b. a three-dimensional printing means whereby said planar slices of said object are sequentially formed and joined to create a replica of said object, said three-dimensional printing means comprising;

(1) means for deriving graphic image data output from the data acquisition means, said graphic image data defining successive adjacent cross-sections of the three-dimensional object to be replicated;

(2) a sheet of curable polymer.

(3) means for spraying a pattern of catalyst or hardener upon said sheet of curable polymer initiating a curing process, said pattern corresponding to said graphic image data, whereby said sheet of curable polymer is selectively cured to form a physical layer of lamina corresponding to said graphic image data;

(4) means for moving said laminae relative to the forming means;

(5) means for transferring and joining said physical layer of lamina to previously formed laminae as they are formed and building up a physical replication of said object in a step-wise fashion whereby the three-dimensional object is automatically formed from a composite of laminae.

13. The apparatus of claim 12 wherein said non-invasive data acquisition means is a computed tomography scanner.

14. The apparatus of claim 12 wherein said non-invasive data acquisition means is a magnetic resonance imaging apparatus.