Patent Number: 
Section: claims

1. A stage device to be used in a vacuum, comprising:a gas supply unit configured to generate a gas;a base member having upper, lower, right, and left surfaces;a slider formed in a frame shape surrounding the base member and having surfaces facing the respective surfaces of the base member, and disposed to be movable; andan air bearing configured to float the slider by supplying the gas to a space between the base member and the slider,wherein the slider includes an air chamber provided on the surfaces facing the base member to accumulate air, an air pad to emit the air for floating the slider above the base member, and an air supply groove to supply the air to the air pad;wherein the base member includes a slider-moving air flow passage buried therein to supply the gas from an inlet port to an outlet port to guide the gas generated by the gas supply unit for supplying the gas to the air chamber of the slider;wherein the base member further includes an air flow passage buried therein to supply the air from the gas supply unit to the air supply groove formed on the slider;wherein the air supplied to the air supply groove is sent to the air pad through an air flow passage buried inside the slider; andwherein the air supply groove is provided only in the slider positioned above the upper surface of the base member. 2. The stage device according to claim 1, whereinthe base member includes a pressure receiving plate to divide the air chamber of the slider into a first air chamber and a second air chamber, andthe slider-moving air flow passage includes a first slider-moving air flow passage and a second slider-moving air flow passage to supply the air from the outlet port of the first slider-moving air flow passage to the first air chamber and to supply the air from the outlet port of the second slider-moving air flow passage to the second air chamber. 3. The stage device according to claim 2, whereinthe slider includes the air chambers located on both the upper and lower surfaces or both the right and left surfaces of the slider that are opposed to each other and facing the base member, andthe outlet ports of the slider-moving air flow passages formed inside the base member respectively supply the air to the air chambers on both the surfaces of the slider. 4. The stage device according to claim 3, further comprising:a first slider and a second slider configured to move simultaneously in a direction perpendicular to a moving direction of the slider, whereinone end of the base member is connected to the first slider and another end of the base member is connected to the second slider, andthe air supplied to any of the slider-moving air flow passage and the air flow passage for air pad inside the base member is supplied through the first slider and the second slider. 5. The stage device according to claim 4, whereinthe first slider is formed into a frame shape around a first fixed member and the second slider is formed into a frame shape around a second fixed member,a flow passage inside the first slider is connected to a flow passage formed inside the first fixed member through a first air supply groove formed on a surface of the first slider facing the first fixed member, anda flow passage inside the second slider is connected to a flow passage formed inside the second fixed member through a second air supply groove formed on a surface of the second slider facing the second fixed member. 6. The stage device according to claim 5, whereinthe flow passage formed inside the first fixed member is formed along a moving direction of the first slider, and is branched at a predetermined position into two in a direction perpendicular to the flow passage to pass through the first fixed member,the flow passage formed inside the second fixed member is formed along a moving direction of the second slider, and is branched at a predetermined position into two in a direction perpendicular to the flow passage to pass through the second fixed member,a third air supply groove is formed on the first slider to be symmetrical to the first air supply groove with respect to the first fixed member, anda fourth air supply groove is formed on the second slider to be symmetrical to the second air supply groove with respect to the second fixed member. 7. The stage device according to claim 6, further comprising:a first end plate located between the base member and the first slider; anda second end plate located between the base member and the second slider, whereinthe slider-moving air flow passage formed inside the base member includes a first-slider moving air flow passage and a second-slider-moving air flow passage,the air is supplied to the first-slider-moving air flow passage through the flow passage formed inside the first fixed member, a passage hole formed inside the first slider, and a passage hole formed in the first end plate, andthe air is supplied to the second-slider-moving air flow passage through the flow passage formed inside the second fixed member, a passage hole formed inside the second slider, and a passage hole formed in the second end plate. 8. The stage device according to claim 5, whereinan air flow passage for air pad formed inside the first slider is connected to an air flow passage for air pad formed inside the first fixed member through an air supply groove formed on the surface of the first slider facing the first fixed member. 9. The stage device according to claim 8, whereinthe air flow passage for air pad formed inside the first fixed member is formed along the moving direction of the first slider, and is branched at a predetermined position into two in a direction perpendicular to the air flow passage for air pad to pass through the first fixed member, andan air supply groove is formed on the first slider to be symmetrical to the air supply groove with respect to the first fixed member. 10. The stage device according to claim 9, further comprising:an end plate located between the base member and the first slider, whereinthe air flow passage for air pad in the base member is supplied with the air through the air flow passage for air pad formed inside first fixed member, a passage hole formed inside the first slider, and a passage hole formed in the first end plate. 11. A stage device to be used in a vacuum, comprising:a gas supply unit configured to generate a gas;a base member having upper, lower, right, and left surfaces;a slider formed in a frame shape surrounding the base member and having surfaces facing the respective surfaces of the base member, and disposed to be movable; andan air bearing configured to float the slider by supplying the gas to a space between the base member and the slider,wherein the slider includes an air chamber provided on the surfaces facing the base member to accumulate air, an air pad to emit the air for floating the slider above the base member,wherein the base member includes a slider-moving air flow passage buried therein to supply the gas from an inlet port to an outlet port to guide the gas generated by the gas supply unit for supplying the gas to the air chamber of the slider; andwherein the base member further includes an air supply groove formed on a surface of the member facing the slider.