摘要:
A position detecting method for detecting the position of a substrate by use of a grating pattern provided on the substrate includes irradiating the grating pattern with first and second radiation beams having different wavelengths to produce first and second diffraction beams of different wavelengths; and receiving the first and second diffraction beams by use of a sensor to determine the position of the substrate on the basis of the position of incidence of each of the first and second diffraction beams on the sensor.
摘要:
A device for detecting positional relationship between first and second objects direction is disclosed. The includes a light source for emitting light in a direction to the first or second object, a first detecting portion the position of incidence of a first light deflected by the first and second objects wherein the position of incidence of the first light upon the first detecting portion is changeable with a change in the positional relationship between the first and second objects in the predetermined direction. Second detecting portion detects the position of incidence of a second light deflected by at least one of the first and second objects, wherein the state of the position of incidence of the second light resulting from a change in the positional relationship between the first and second objects, in the predetermined direction differs from that of the first light. On the basis of the detection by the first and second detecting portions, the positional relationship between the first and second objects is detected without being affected by an inclination.
摘要:
A position detecting method for detecting the position of a substrate by use of a grating pattern provided on the substrate includes irradiating the grating pattern with first and second radiation beams having different wavelengths to produce first and second diffraction beams of different wavelengths; and receiving the first and second diffraction beams by use of a sensor to determine the position of the substrate on the basis of the position of incidence of each of the first and second diffraction beams on the sensor.
摘要:
A device for measuring an interval between two plate-like objects (2, 3) includes a light source (LD) for projecting a light toward the objects, a detector (8) for detecting a position of incidence, upon a predetermined surface, of the light projected by the light source and deflected by the two objects, and a calculating portion for measuring the interval of the two objects on the basis of the detection by the detector.
摘要:
A device for measuring an interval between two plate-like objects (2, 3) includes a light source (LD) for projecting a light toward the objects, a detector (8) for detecting a position of incidence, upon a predetermined surface, of the light projected by the light source and deflected by the two objects, and a calculating portion for measuring the interval of the two objects on the basis of the detection by the detector.