Patent ID: 9244367
Filing Date: 2016-01-26
CPC Classification: G03F,Y10T

Claim Text:
1. An exposure apparatus that exposes a substrate with illumination light via a projection optical system, the apparatus comprising: a stage having a holder to hold the substrate; a drive system having a planar motor, that drives the stage so that the substrate is moved in directions of six degrees of freedom including a first direction and a second direction orthogonal to each other within a predetermined plane perpendicular to an optical axis of the projection optical system, a part of the planar motor being provided at the stage; a measurement system that has four heads provided at the stage and each irradiating a measurement beam to a scale member from below, and that measures positional information of the stage in the directions of six degrees of freedom, the scale member having four sections and an opening, and the four sections each having a reflection-type grating formed; and a controller coupled to the drive system, that controls a drive of the stage by the drive system based on the positional information measured by the measurement system, wherein the scale member is provided so that the projection optical system is positioned in the opening, the four heads are placed at the stage so that a distance between two heads of the four heads is larger than a width of the opening, a movement area where the stage is moved in an exposure operation of the substrate includes a first area, a second area, a third area, a fourth area and a fifth area, and in the exposure operation, the stage is moved from one area of the first, the second, the third and the fourth areas to another area of the first, the second, the third and the fourth areas, via the fifth area, the another area being different from the one area, in the another area, instead of one head of three heads used in the one area, another head of the four heads that is different from three heads used in the one area is used, and positional information of the stage is measured by three heads that are the another head and two heads except for the one head of three heads used in the one area, and the controller controls the drive of the stage using three heads used in the another area, instead of three heads used in the one area, during a time at which the stage is within the fifth area.