摘要:
A positioning device (3) suitable for use in a lithographic device with an exposure position and a characterization position has a displacement system (35) comprising a first displacement unit (39) and a second displacement unit (41) to which object holders (21, 23) can be coupled alternately. The first displacement unit is suitable for carrying out a first series of positioning steps of a first object holder (21) in a first position and for displacing the first object holder from the first position into an intermediate position (M', M'') between the first position and a second position. The second displacement unit is suitable for carrying out a second series of positioning steps of a second object holder (23) in the second position simultaneously with an independently from the first displacement unit and for displacing the second object holder from the second position into the intermediate position. In the intermediate position, the object holders are exchanged, after which the first series of positioning steps can be carried out by the first displacement unit with the second object holder in the first position and the second series of positioning steps can be carried out by the second displacement unit with the first object holder in the second position.
摘要:
The positioning device (3) has a first part displaceable relative to a second part having an object table (5). The second part is displaceable relative to the first part about X,Y and Z axes by three motors (75,77,79) each having an electrical coil system (81,83,85) cooperating with a permanent magnet system. The main axis of each of the motors encloses an angle of 120[deg] with the main axis of each of the other two motors. In this manner the points of application on the second part of the driving forces of the motors are uniformly distributed relative to the second part, so that driving forces can be uniformly transmitted to the object table by a simple, light stiffening structure of the second part.
摘要:
The system has several X and Y measuring axes cooperating with X and Y measuring mirror on object (WH). The system has one Z measuring axis (MAX7 and 8) extending partly in an XY plane and cooperating with Z measuring mirrors (R'3 and 4) on object, and Z reflectors (164 and 168). Using this simple mechanism a larger number of more accurate and reliable measurements are performed with the system.
摘要:
In a lithographic projection apparatus, a time-saving height measurement method is used. While in a projection station (105, 108, 111) the pattern of a mask (129) is projected on the fields of a first substrate (120), the height of the fields of a second substrate (121) is measured in a measuring station (133). In the measuring station, the height of the substrate fields and the height of the substrate holder (113) are measured by a first height sensor (150) and a second height sensor (160), respectively, and the value of the height of the substrate holder associated with the ideal height of the substrate field is determined for each substrate field. In the projection station, only the height of the substrate holder (111) is controlled by a third height sensor (180). The second and third height sensors are preferably part of a composite XY interferometer system extended with a Z measuring axis.