摘要：
A reflector includes a first reflector section 202a and a second reflector section 202b. The first reflector section extends along a portion of a first ellipse 204a. The second reflector section extends along a portion of a second ellipse 204b, the second ellipse intersecting the first ellipse at 206a. The intersecting point 206a may be located between first vertices and first focal points of the first and second ellipses. The reflector sections may be continuously curved or formed from multiple straight sections. A major axis208a, 208b of the first and second ellipse may be parallel to each other or inclined to each other bringing their second focal points closer together, or until they meet. Radiating elements may be located at the first foci of the ellipses and the ellipses may intersect each other at the radiating elements. The reflector may have a third reflector section and a third radiating element. The invention includes an additive (3D) manufacturing system comprising the reflector and radiating elements.
权利要求：
CLAIMS
1. A reflector, comprising:
a first reflector section; and
a second reflector section,
wherein the first reflector section extends along a portion of a first ellipse, and the second reflector section extends along a portion of a second ellipse, the second ellipse intersecting the first ellipse, and
wherein the first reflector section and the second reflector section are joined at an intersecting point of the first ellipse and the second ellipse.
2. The reflector of claim 1, wherein the intersecting point of the first ellipse and the second ellipse is located at a position between a first vertex of the first ellipse and the second ellipse and a first focal point of the first ellipse and the second ellipse.
3. The reflector of claim 1, wherein each of the first reflector section and the second reflector section is formed of a continuously curved section.
4. The reflector of claim 1, wherein each of the first reflector section and the second reflector section includes a plurality of straight sections, the straight sections con- nected with each other.
5. The reflector of claim 1, wherein a major axis of the first ellipse and a major axis of the second ellipse are parallel to each other.
6. The reflector of claim 1, wherein a major axis of the first ellipse and a major axis of the second ellipse are inclined with respect to each other so that a second focal point of the first ellipse and a second focal point of the second ellipse are located closer to each other than a first focal point of the first ellipse and a first focal point of the second ellipse.
7. The reflector of claim 6, wherein the major axes of the first ellipse and the second ellipse are inclined with respect to each other such that the second focal points coincide.
8. An apparatus, comprising:
a reflector of claim 1;
a first radiating element; and
a second radiating element,
wherein the first radiating element is located at a first focal point of the first ellipse, and the second radiating element is located at a first focal point of the second ellipse.
9. The apparatus of claim 8, wherein the first ellipse and the second ellipse intersect each other such that the first ellipse intersects the second radiating element and that the second ellipse intersects the first radiating element.
10. The apparatus of claim 8, wherein
each of the first reflector section and the second reflector section includes a first end and a second end,
the first ends of the first reflector section and the second reflector section are joined at the intersecting point of the first ellipse and the second ellipse, and
the second ends of the first reflector section and the second reflector section are located at a position below the first radiating element and the second radiating element.
11. The apparatus of claim 10, wherein the second ends of the first reflector section and the second reflector section are located at the same position below the first radiating element and the second radiating element.
12. The apparatus of claim 8, comprising
a first end reflector located at a first end of the first radiating element and the sec- ond radiating element;
a second end reflector located at a second end of the first radiating element and the second radiating element, the first end reflector and the second end reflector arranged traverse to the reflector; and
a plate located below the first radiating element and the second radiating element, the plate being transparent to a wavelength spectrum emitted by the first radiating ele- ment and the second radiating element,
wherein the reflector, the first end reflector, the second end reflector and the plate are arranged to form an enclosed volume around the first radiating element and the sec- ond radiating element.
13. The apparatus of claim 8, wherein
the first radiating element includes a first elongated lamp to emit a wavelength spectrum to heat a powder material used in an additive manufacturing process,
the second radiating element includes a second elongated lamp to emit a wave- length spectrum to heat the powder material, and
the first elongated lamp and the second elongated lamp are located beneath the reflector and extend side by side along the longitudinal direction.
14. The apparatus of claim 8, comprising
a third radiating element,
wherein the reflector includes a third reflector section,
wherein the third reflector section extends along a portion of a third ellipse, the third ellipse intersecting the second ellipse,
wherein the third radiating element is located at a first focal point of the third el- lipse, and
wherein the second reflector section and the third reflector section are joined at an intersecting point of the second ellipse and the third ellipse.
15. An additive manufacturing system, comprising:
a build module to build a 3D object from a build material; and
an energy source to apply energy to the build material to cause a solidification of printed portions of the build material,
wherein the energy source includes
a reflector;
a first radiating element; and
a second radiating element,
wherein the reflector includes a first reflector section and a second reflector section,
wherein the first reflector section extends along a portion of a first ellipse, and the second reflector section extends along a portion of a second ellipse, the second ellipse intersecting the first ellipse,
wherein the first radiating element is located at a first focal point of the first ellipse, and the second radiating element is located at a first focal point of the second el- lipse, and
wherein the first reflector section and the second reflector section are
joined at an intersecting point of the first ellipse and the second ellipse.