Abstract: An optical apparatus includes a folding mirror configured to direct first and second illumination lights on first and second alignment marks respectively and reflect first and second reflected lights reflected from the first and second alignment marks in different horizontal directions respectively, first and second lenses arranged respectively in optical paths of the first and second reflected lights reflected from the first and second reflective surfaces of the folding mirror, first and second reflection portions configured to reflect the first and second reflected lights passing through the first and second lenses respectively, and a beam splitter prism configured to divide an illumination light incident through a first surface into the first and second illumination lights and direct to the first and second reflection portions, and transmit the first and second reflected lights reflected by the first and second reflection portions through a second surface.

Abstract: A chuck-driving device includes a base extending in first and second directions. The second direction crosses the first direction. The chuck-driving device further includes a slider positioned on the base and configured to move in a third direction substantially perpendicular to the first and second directions, and a pneumatic cylinder positioned on the base and to support the slider in the third direction. The chuck-driving additionally includes a motor assembly positioned on the base, around the pneumatic cylinder, and configured to drive the slider in the third direction. The motor assembly includes a coil base having a hollow portion disposed around sides of the pneumatic cylinder, a coil assembly positioned on the coil base and disposed around the sides of the pneumatic cylinder, and a magnet assembly adjacent to a part of the coil assembly.

Abstract: A chuck-driving device includes a base extending in first and second directions. The second direction crosses the first direction. The chuck-driving device further includes a slider positioned on the base and configured to move in a third direction substantially perpendicular to the first and second directions, and a pneumatic cylinder positioned on the base and to support the slider in the third direction. The chuck-driving additionally includes a motor assembly positioned on the base, around the pneumatic cylinder, and configured to drive the slider in the third direction. The motor assembly includes a coil base having a hollow portion disposed around sides of the pneumatic cylinder, a coil assembly positioned on the coil base and disposed around the sides of the pneumatic cylinder, and a magnet assembly adjacent to a part of the coil assembly.