专利汇可以提供Chuck for use in out-of-contact optical alignment and exposure apparatus专利检索,专利查询,专利分析的服务。并且A calibrator plate is retractably mounted between a mask holder and a wafer chuck, which is in turn pivotally mounted below the mask holder on a piston for axially moving the wafer chuck towards and away from the mask holder. The wafer chuck includes a peripheral portion and a central portion that may be axially depressed relative to the upper surface of the peripheral portion and that may thereafter be returned to its normal undepressed position. These portions of the wafer chuck and corresponding offset portions of the calibrator plate are employed to space the upper surface of a semiconductive wafer on the central portion of the wafer chuck a finite distance below the upper surface of the peripheral portion of the wafer chuck. The calibrator plate is then retracted from between the mask holder and the wafer chuck, which is thereupon driven upward to position the upper surface of the peripheral portion of the wafer chuck in abutment upon a marginal portion of the lower surface of a photomask held by the mask holder. This aligns the lower surface of the photomask and the upper surface of the semiconductive wafer in parallel planes spaced the finite distance apart without bringing the semiconductive wafer into contact with the photomask.,下面是Chuck for use in out-of-contact optical alignment and exposure apparatus专利的具体信息内容。
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