Method and apparatus for generating three-dimensional objects using ablation transfer

• US 6,025,110 A
• Filed: 01/27/1999
• Issued: 02/15/2000
• Est. Priority Date: 09/18/1997
• Status: Expired due to Fees

• Current Assignee: Michael T. Nowak
• Original Assignee: Michael T. Nowak
• Inventors: Nowak, Michael T.
• Primary Examiner(s): ANGEBRANNDT, MARTIN J
• Application Number:
  US09/246,693
• Time in Patent Office: 384 Days
• Field of Search: 430/200, 430/201, 430/945, 430/269, 156/233, 156/234, 156/235, 427/596, 427/597
• US Class Current: 430/200
• CPC Class Codes: B29C 2035/0822 using IR radiation
• CPC Class Codes: B29C 2035/0838 using laser
• CPC Class Codes: B29C 59/16 by wave energy or particle radiation , e.g. infrared heating B29C59/007 takes precedence
• CPC Class Codes: B33Y 10/00 Processes of additive manufacturing
• CPC Class Codes: C23C 14/0005 Separation of the coating from the substrate
• CPC Class Codes: C23C 14/048 using irradiation by energy or particles
• CPC Class Codes: C23C 14/28 by wave energy or particle radiation C23C14/32 - C23C14/48 take precedence
• CPC Class Codes: H05K 3/046 by selective transfer or selective detachment of a conductive layer
• CPC Class Codes: Y10S 430/146 Laser beam

Abstract

A three-dimensional object is generated according to a stored, digital representation through layer-by-layer transfer of material onto a receiver, each layer corresponding to a layer of the three-dimensional representation. Each deposited layer is applied through selective irradiation of an ablation-transfer carrier. The carrier includes a transfer material that is ejected in response to irradiation, and which solidifies on the receiver or on a previously applied layer of transfer material. Thus, irradiation of the carrier in an area pattern corresponding to a layer results in deposition of the transfer material in accordance with the pattern. Sequential irradiations of fresh ablation-transfer carrier material, each according to a two-dimensional pattern corresponding to one of the contiguous layers of the three-dimensional object, result in depositions that gradually build up into the three-dimensional object.

Claims

1. A method of generating a three-dimensional object onto a receiver surface by ablation transfer, the method comprising the steps of:

a. representing the object as a three-dimensional image comprising a plurality of layers, each layer comprising an array of object positions arranged along first and second dimensions, the layers being contiguous along a third dimension;

b. providing a transfer carrier comprising first and second opposed surfaces and, on the first surface, a polymeric transfer material, irradiation of the transfer carrier by transfer radiation through the second surface causing ablative ejection of the transfer material from the carrier onto the receiver surface, the receiver surface and the transfer material being separated by a separation distance;

c. depositing a first layer onto the receiver surface by irradiating the transfer carrier in a pattern corresponding to a first layer of the three-dimensional image; and

d. depositing at least five additional layers by augmenting the separation distance and irradiating the transfer carrier in patterns corresponding to the additional layers of the three-dimensional image, each successive layer being deposited onto the previous layer.

2. The method of claim 1 wherein step (e) is repeated for each contiguous layer of the image.

3. The method of claim 1 wherein the transfer carrier is irradiated by at least one laser source.

4. The method of claim 3 wherein each depositing step comprises:

a. causing relative movement between the at least one laser source and the receiver surface, the transfer carrier being disposed between the at least one laser source and the receiver surface, to thereby effect a scan of at least a portion of the transfer carrier; and

b. actuating the laser source in a pattern corresponding to the array of object positions in a layer so as to deposit the transfer material in accordance with the pattern.

5. The method of claim 4 wherein the transfer carrier is in the form of a tape, and further comprising the step of advancing the tape between depositing steps.

6. The method of claim 3 wherein the laser emits in the infrared region.

7. The method of claim 1 wherein the carrier comprises a sheet substantially transparent to transfer radiation, the polymeric transfer material being applied to a surface thereof and comprising:

a. a transfer layer comprising a polymeric material; and

b. an ejection layer disposed between the transfer layer and the transparent sheet, the ejection layer comprising a material that absorbs transfer radiation and, in response thereto, causes ejection of the transfer layer.

8. The method of claim 7 wherein the ejection material comprises a self-oxidizing polymer.

9. The method of claim 8 wherein the self-oxidizing polymer intrinsically absorbs transfer radiation.

10. The method of claim 8 wherein the radiation absorbing material is dispersed in the self-oxidizing polymer.

11. The method of claim 8 wherein the self-oxidizing polymer is selected from the group consisting of nitrocelluloses and polycarbonates.

12. The method of claim 7 wherein the transfer layer comprises at least one thermoplastic polymer.

13. The method of claim 7 wherein the ejection layer comprises an ignition sublayer and a self-oxidizing polymer sublayer, the ignition sublayer igniting upon exposure to transfer radiation.

14. The method of claim 1 further comprising the step of curing the deposited polymeric transfer material.

15. The method of claim 14 wherein the curing step comprises exposing the deposited polymeric transfer material to actinic radiation.

16. The method of claim 14 wherein the curing step comprises exposing the deposited polymeric transfer material to heat.

17. The method of claim 1 wherein each layer is approximately 2 mils thick.

18. The method of claim 1 wherein a sufficient number of layers is deposited such that the object has a thickness of at least 1 mm.

19. The method of claim 1 further comprising the step of removing the three-dimensional object from the receiver surface, the object being self-supporting.