Patent Number: 
Section: claims

1. A substrate cover comprising:a frame-like member configured to be placed on a substrate which is to be written using a charged particle beam, and to have an outer perimeter dimension larger than a perimeter end of the substrate and an inner perimeter dimension, being a border between the frame-like member and an inner opening portion, smaller than the perimeter end of the substrate; anda contact point part configured to be provided on an undersurface of the frame-like member, in order to be electrically connected to the substrate. 2. The substrate cover according to claim 1, wherein the substrate cover includes a predetermined mark formed on the frame-like member. 3. The substrate cover according to claim 1, wherein the substrate cover is formed of conductive material. 4. The substrate cover according to claim 3, wherein the conductive material is metal material. 5. The substrate cover according to claim 1, wherein the substrate cover is formed of insulating material and a surface thereof is coated with conductive material. 6. The substrate cover according to claim 5, wherein the insulating material is ceramic material. 7. A charged particle beam writing apparatus comprising:a stage configured to hold thereon a substrate attached with a substrate cover covering a whole perimeter part of the substrate and including a contact point electrically connected to the substrate;an electric conductive member configured to be electrically connected to the contact point and couple the substrate charged to ground potential, in a state that the substrate is arranged on the stage; anda writing unit configured to write a predetermined pattern onto the substrate by using a charged particle beam, in a state that the substrate is coupled to ground potential by using the electric conductive member. 8. The writing apparatus according to claim 7, wherein the substrate cover includes a frame-like member configured to have an outer perimeter dimension larger than a perimeter end of the substrate and an inner perimeter dimension, being a border between the frame-like member and an inner opening portion, smaller than the perimeter end of the substrate, wherein a predetermined mark is formed on an uppersurface of the frame-like part member. 9. A charged particle beam writing method comprising:carrying a substrate attached with a substrate cover with a predetermined mark formed thereon into a pattern writing apparatus;checking a position of the substrate by using the predetermined mark formed on the substrate cover; andwriting a predetermined pattern on the substrate whose position has been checked, by using a charged particle beam. 10. A charged particle beam writing method comprising:carrying a substrate attached with a substrate cover that covers a whole perimeter part of the substrate into a pattern writing apparatus; andwriting a predetermined pattern on the substrate attached with the substrate cover, by using a charged particle beam.