Patent ID: 8659743
Filing Date: 2014-02-25
Classification: G03B,G03F

Abstract:
1. A detection apparatus for detecting an upper-surface mark and a lower-surface mark formed on an upper surface and a lower surface, respectively, of a substrate onto which a pattern is transferred, the apparatus comprising: a light source configured to emit first light with a wavelength that transmits through the substrate, and second light with a wavelength that does not transmit through the substrate; a photoelectric conversion device having a light-receiving surface; and an optical system configured to form: an image of the lower-surface mark on the light-receiving surface of the photoelectric conversion device using the first light emitted by the light source, applied to the lower-surface mark from an upper surface side of the substrate, and reflected by the lower-surface mark; and an image of the upper-surface mark on the light-receiving surface of the photoelectric conversion device using the second light emitted by the light source, applied to the upper-surface mark from the upper surface side of the substrate, and reflected by the upper-surface mark, wherein the optical system includes a lens having an on-axis chromatic aberration to form the image of the lower-surface mark using the first light and the image of the upper-surface mark using the second light on the light-receiving surface of the photoelectric conversion device.