Vacuum chuck
First Claim
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1. A vacuum-attraction holding device, comprising:
- a holding base having an attracting surface, for holding a substrate thereon;
a suction passageway formed in said base, for supplying a vacuum to said holding base to attract the substrate to said attracting surface; and
a pressure sensor provided in said base and being communicated with said suction passageway.
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Accused Products
Abstract
A vacuum-attraction holding device includes a holding base having an attracting surface, for holding a substrate thereon; a suction passageway formed in the base, for supplying a vacuum to the holding base to attract the substrate to the attracting surface; and a pressure sensor provided in the base and being communicated with the suction passageway.
125 Citations
16 Claims
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1. A vacuum-attraction holding device, comprising:
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a holding base having an attracting surface, for holding a substrate thereon; a suction passageway formed in said base, for supplying a vacuum to said holding base to attract the substrate to said attracting surface; and a pressure sensor provided in said base and being communicated with said suction passageway. - View Dependent Claims (2, 3)
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4. A vacuum-attraction holding device, comprising:
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a holding base having an attracting surface, for holding a substrate thereon; a suction passageway formed in said base, for supplying a vacuum to said holding base to attract the substrate to said attracting surface; a gauging passageway formed in said base separately from said suction passageway, said gauging passageway being opened to said attracting surface; and a pressure sensor communicated with said gauging passageway. - View Dependent Claims (5, 6)
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7. An exposure apparatus, comprising:
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a holding base having an attracting surface, for holding a substrate thereon; a suction passageway formed in said base, for supplying a vacuum to said holding base to attract the substrate to said attracting surface; a gauging passageway formed in said base separately from said suction passageway, said gauging passageway being opened to said attracting surface; a pressure sensor communicated with said gauging passageway; exposure means for exposing the substrate held on said base; and control means for controlling at least one of the holding operation to the substrate through said base and the exposure operation to the substrate through said exposure means, on the basis of an output of said pressure sensor. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A semiconductor wafer processing method for manufacture of semiconductor devices, said method comprising the steps of:
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placing a semiconductor wafer on a holding base having an attracting surface; supplying a vacuum to the base so that the wafer is attracted to the attracting surface through vacuum attraction; detecting, within the base, a pressure related to the vacuum attraction; and exposing the wafer held by said base; wherein at least one of the holding operation to the wafer through the base and the exposure operation to the wafer is controlled on the basis of the detection of the pressure. - View Dependent Claims (14, 15)
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16. A semiconductor wafer processing method for manufacture of semiconductor devices, said method comprising the steps of:
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providing a wafer holding base with a wafer attracting surface and having a suction passageway and a gauging passageway formed therein, wherein the gauging passageway is separate from the suction passageway and is opened to the attracting surface; placing a semiconductor wafer on the base; supplying a vacuum to the base through the suction passageway so that the wafer is attracted to the attracting surface through vacuum attraction; detecting, through the gauging passageway, a pressure related to the vacuum attraction; and exposing the wafer held by said base; wherein at least one of the holding operation to the wafer through the base and the exposure operation to the wafer is controlled on the basis of the detection of the pressure.
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Specification