Vacuum chamber and method of manufacturing the vacuum chamber

A vacuum chamber comprising:

• a plurality of plates arranged to be joined together by using bolts to form an internal space;
• a sealing member continuously disposed alone joint lines on the inside portion of said vacuum chamber facing the internal space in order to seal joint portions among said plates;
• and
• pressing members secured to said plates by bolts so as to hermetically press said sealing member against the joint portions among said plates, wherein said sealing member has a plurality of first sealing portions, each of which is formed into a straight shape and which are disposed along the joint lines of two plates for sealing the joint portion between two plates, and a plurality of second sealing portions disposed along joint lines of three plates for sealing the joint portions of the three plates, each of said second sealing portions has legs extending into three directions for sealing three-directional joint lines of corner portions of said vacuum chamber in which three plates are joined, wherein each of said second pressing portions has three attaching surfaces disposed along three plates, and wherein said pressing members have a plurality of first pressing portions for pressing said first sealing portions against the joint portions and a plurality of second pressing portions for pressing said second sealing portions against the joint portions.

A vacuum chamber comprising:

• a plurality of plates arranged to be joined together by using bolts to form an internal space;
• a sealing member continuously disposed along joint lines on the inside portion of said vacuum chamber facing the internal space in order to seal joint portions among said plates;
• and
• pressing members secured to said plates by bolts so as to hermetically press said sealing member against the joint portions among said plates, said pressing members having a plurality of first pressing portions for pressing said first sealing portions against the joint portions and a plurality of second pressing portions for pressing said second sealing portions against the joint portions, wherein adjacent first pressing portions or adjacent first pressing portion and said second pressing portion are disposed while being brought into contact with each other without forming any gap, wherein said sealing member has a plurality of first sealing portions, each of which is formed into a straight shape and which are disposed along the joint lines of two plates for sealing the joint portion between two plates, and a plurality of second sealing portions disposed alone joint lines of three plates for sealing the joint portions of the three plates, and wherein each of said second sealing portions has legs extending into three directions for sealing three-directional joint lines of corner portions of said vacuum chamber in which three plates are joined.

A method of manufacturing a vacuum chamber comprising the steps of:

• joining a plurality of plates by using bolts to form a chamber having an internal space;
• continuously disposing a sealing member along inner joint lines facing the internal space in order to seal joint portions among said plates, at least one of the joint portions being disposed along joint lines of three of said plates;
• and
• securing pressing members against said plates by bolts to cause said pressing members to press said sealing member against the joint portions among said plates.