Olympus Corporation

Nissei Technology Corporation

Takuya Otsu

Kenichiro Abe

Takahiro Amanai

Takashi Fujikura

Yoshihiro Uchida

A wide-angle imaging optical system obtains sufficient information in the image periphery, and achieves high-performance imaging across the entire field of view. The imaging optical system uses stereographic projection, and includes, in sequence from an object, a first lens with a negative refractive power having a convex surface facing the object, a second lens with a negative refractive power, a third lens with a negative refractive power, a fourth lens with a positive refractive power, an aperture stop, a fifth lens with a positive refractive power, a sixth lens with a negative refractive power, and a seventh lens with a positive refractive power.

Imaging optical system and imaging device including imaging optical system comprising seven lenses of &#x2212;&#x2212;&#x2212;++&#x2212;+ refractive powers

A zoom lens includes in order from an object side, a first lens group having a negative refractive power, a second lens group having a positive refractive power, a third lens group having a negative refractive power, and a fourth lens group having a positive refractive power, and at the time of zooming, the first lens group is fixed, the second lens group moves, the third lens group moves, and the fourth lens group is fixed. The first lens group includes in order from the object side, a negative lens, a reflecting optical element, and a positive lens. The second lens group includes in order from the object side, an aperture stop, a positive lens, a cemented lens having a negative refractive power, and a positive lens. The cemented lens includes a positive lens and a negative lens.

Zoom lens, image pickup apparatus using the same, and information processing apparatus

An optical system includes, in order from the object side, an aperture, a first lens having a positive refractive power, a second lens having a negative refractive power, a third lens having a positive refractive power, a fourth lens having a positive refractive power and having a meniscus shape with a convex surface facing the image side, and a fifth lens having a negative refractive power. The optical system satisfies a certain condition.

Image forming optical system, image pickup apparatus using the same, and information processing apparatus

An imaging optical system smaller than conventional systems yet with well-corrected aberrations, comprises five lenses L-Lhaving refractive powers, in order from the object side: positive, negative, positive, positive, and negative, with an aperture at an endmost object-side position. In one embodiment, Lis biconvex, L's object-side surface is convex, L's object-side surface is convex, and 1.0&#x2266;f/f&#x2266;4.9, fand fbeing the focal lengths of Land L, respectively. In a variant thereof, Lis a meniscus lens and L's object-side surface is concave. In another embodiment, Lis glass, and &#x2212;4.0&#x3c;(r+r)/(r&#x2212;r)&#x3c;&#x2212;0.51, rand rbeing paraxial curvature radii of L's object-and image-side surfaces, respectively. In another embodiment, Lis glass, and &#x2212;1.5&#x3c;f/f&#x3c;&#x2212;0.73, fbeing the focal length of Land f the focal length of the whole optical system. In yet another embodiment, Lis glass, and &#x2212;11.2&#x3c;r/f&#x3c;&#x2212;0.9, rbeing the paraxial curvature radius of L's image-side surface.

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Tokyo, Japan

Takuya Otsu