Emitter and field emission assembly including the same

1 . An emitter that emits electrons in an apparatus for generating electromagnetic waves,

wherein the emitter is in a form of a sheet in which a plurality of yarns including carbon nanotube fibers are woven, wherein the plurality of yarns are woven together to form the sheet,

the emitter comprising at least one of a curved part to form a ridge in a direction of electron emission and a part bent to form a ridge in the direction of electron emission.

2 . The emitter of claim 1 ,

wherein the curved part or the part bent forms a single ridge.

3 . The emitter of claim 2 ,

wherein, each of both side portions of the ridge becomes closer to each other towards direction of electron emission.

4 . The emitter of claim 1 ,

wherein the emitter has a shape in which a slope of a tangent changes continuously.

5 . The emitter of claim 4 ,

first curvature at the ridge is different from a second curvature of other parts of the emitter.

6 . The emitter of claim 1 ,

wherein,

the part bent includes a concave shape dented toward a center, and the concave shape is formed in each of both side portions of the ridge.

7 . The emitter of claim 1 ,

wherein the plurality of yarns extending in a first direction is arranged in a second direction that intersects the first direction.

8 . The emitter of claim 7 ,

wherein the ridge is formed parallel to the first direction.

9 . The emitter of claim 7 ,

wherein the ridge is formed parallel to the second direction.

10 . A field emission assembly, comprising:

an emitter that is in a form of a sheet in which a plurality of yarns including carbon nanotube fibers are woven, wherein the plurality of yarns are woven together to form the sheet; and

a holder that fixes the emitter,

wherein the emitter in the form of the sheet includes at least one of a curved part to form a ridge in a direction of electron emission and a part bent to form a ridge in the direction of electron emission.

11 . The field emission assembly of claim 10 ,

wherein the emitter is electrically connected to the holder by at least one of a manner that the emitter is pressed by the holder, a manner that the emitter is welded to the holder, and a manner that the emitter is attached to the holder by adhesive.

12 . The field emission assembly of claim 10 ,

wherein the emitter has two ends that are spaced apart from each other centered on the ridge and fixed to the holder.

13 . The field emission assembly of claim 12 ,

wherein the holder includes a body part, and

wherein the two ends of the emitter are in close contact with both sides of the body part, respectively.

14 . The field emission assembly of claim 13 ,

wherein the holder includes a first fixing part disposed on one side of the body part and a second fixing part disposed on an opposite side of the body part, and

wherein an end of the emitter is disposed between the body part and the first fixing part, and

an opposite end of the emitter is disposed between the body part and the second fixing part.

15 . The field emission assembly of claim 12 ,

wherein the two ends of the emitter, centered on the ridge, are adjacent to each other and are fixed to the holder.

16 . The field emission assembly of claim 15 ,

wherein the holder includes a first body part, and

wherein one of the two ends of the emitter are is in close contact with one side surface of the first body part.

17 . The field emission assembly of claim 16 ,

wherein the holder includes a second body part disposed on one side of the first body part, and

wherein the two ends of the emitter are disposed between the first body part and the second body part.

18 . The field emission assembly of claim 10 ,

wherein the emitter has a length in a direction of the ridge and the length is greater than a height to which the emitter protrudes from the holder.