Optical: systems and elements – Lens – With field curvature shaping
Reexamination Certificate
2005-03-15
2005-03-15
Sugarman, Scott J. (Department: 2873)
Optical: systems and elements
Lens
With field curvature shaping
C359S754000
Reexamination Certificate
active
06867922
ABSTRACT:
A projection optical system includes a plurality of positive lens groups having a positive refractive power, and at least one negative lens group having a negative refractive power, wherein, when L is a conjugate distance of the projection optical system and φ0is the sum of powers of the or each negative lens group, a relation |L×φ0|>17 is satisfied, wherein, when h is a height of an axial marginal light ray and hbis a height of a most abaxial chief ray, at least two aspherical surfaces are formed on surfaces which satisfy a relation |hb/h|>0.35, wherein, when ΔASPH is an aspherical amount of each aspherical surface, a relation |ΔASPH/L|>1.0×10−6is satisfied, and wherein the at least two aspherical surfaces include regions in which, from a central portion toward a peripheral portion of the surface, their local curvature powers change with mutually opposite signs.
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Ishii Hiroyuki
Kato Takashi
Terasawa Chiaki
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