Photocopying – Projection printing and copying cameras – Illumination systems or details
Reexamination Certificate
2006-05-30
2006-05-30
Nguyen, Henry Hung (Department: 2851)
Photocopying
Projection printing and copying cameras
Illumination systems or details
C355S053000
Reexamination Certificate
active
07053986
ABSTRACT:
A projection optical system projects an image of a first object onto a second object. A first imaging optical system forms a first intermediate image of the first object, and is a refractive optical system. A second imaging optical system forms a second intermediate image of the first object, and includes two mirrors, one of the two being concave. A third imaging optical system forms an image of the first object onto the second object, and includes a lens. The first, second and third imaging optical systems are arranged along an optical path from the first object in this order. The system satisfies the expression 0.80<|β1·β2<2.0 where β1and β2are paraxial magnifications of the first and second imaging optical systems, respectively. The first imaging optical system and the concave mirror have a common straight optical axis.
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Kato Takashi
Terasawa Chiaki
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