公开(公告)号：US20190252152A1

公开(公告)日：2019-08-15

申请号：US16342859

申请日：2017-10-18

Applicant: RELIANCE PRECISION LIMITED

Inventor： Nigel CROSLAND ,  Andrew MCCLELLAND ,  Phil HOYLE ,  Ian LAIDLER

IPC: H01J37/305 ,  H01J37/147 ,  H01J37/302 ,  B22F3/105

CPC classification number: H01J37/305 ,  B22F3/1055 ,  B22F2003/1056 ,  B22F2003/1057 ,  H01J37/1472 ,  H01J37/1475 ,  H01J37/302 ,  H01J37/3023 ,  H01J2237/30483 ,  Y02P10/295

Abstract: A method of forming a product using additive layer manufacture is provided. The method comprises forming the product as a series of layers, each layer being formed by fusing powder deposited as a powder bed by scanning the powder bed using a charged particle beam to form a desired layer shape. For each layer, the powder is fused by melting successive areas of the powder bed by scanning the charged particle beam using a combination of a relatively long-range deflector and a relatively short-range deflector, wherein the relatively long-range deflector deflects the charged particle beam over a larger deflection angle than the short-range deflector. Also provided are a corresponding charged particle optical assembly, and an additive layer manufacturing apparatus.