Olympus Corporation

Olympus Imaging Corporation

Olympus Corpration

Keisuke Ichikawa

Shinichi Mihara

Takashi Fujikura

Koji Matsumoto

Keigo Matsuo

Yoshihiro Uchida

Kanato Adachi

Kazuaki Murayama

Yasunobu Iga

Hideki Nagata

Kenichiro Abe

Kazuteru Kawamura

Kenji Ono

Keisuke Takada

Toyoki Kon

Masahito Ohashi

Tetsuya Yanai

Masato Miyata

Fumikazu Kanetaka

Yo Furuya

Masaki Arakawa

A wide-angle optical system includes a first lens unit having a negative refractive power, a second lens unit having a positive refractive power, and a third lens unit having a positive refractive power. At the time of carrying out a focal-position adjustment, the second lens unit is moved. The third lens unit includes a positive single lens on an image side of a cemented surface Sc having a negative refractive power nearest to an image in the third lens unit, and has a plurality of refractive surfaces having a negative refractive power on the object side of the cemented surface Sc. The third lens unit has at least one refractive surface Sp having a positive refractive power which satisfies following conditional expression (1):0.02<<1.20  (1).A wide-angle optical system includes a first lens unit having a negative refractive power, a second lens unit having a positive refractive power, and a third lens unit having a positive refractive power. At the time of carrying out a focal-position adjustment, the second lens unit is moved. The third lens unit includes a positive single lens on an image side of a cemented surface Sc having a negative refractive power nearest to an image in the third lens unit, and has a plurality of refractive surfaces having a negative refractive power on the object side of the cemented surface Sc. The third lens unit has at least one refractive surface Sp having a positive refractive power which satisfies following conditional expression (1):0.02<<1.20  (1).

Wide-angle optical system and image pickup apparatus using the same

A wide-angle optical system is a wide-angle optical system having a lens component, and includes in order from an object side, a first lens unit having a negative refractive power, a second lens unit having a negative refractive power, and a third lens unit having a positive refractive power. At the time of carrying out a focal-position adjustment from a far point to a near point, the second lens unit is moved from a first position toward a second position. The third lens unit includes not less than three lens components. Not less than three lens components include a first lens component and a second lens component. Each of the first lens component and the second lens component has a positive refractive power, and following conditional expression (1) is satisfied:0.8<312/<6.0  (1).

A wide-angle optical system includes in order from an object side, a first lens unit having a negative refractive power, a second lens unit having a positive refractive power, and a third unit having a positive refractive power. At the time of carrying out a focal-position adjustment from a far point to a near point, the second lens unit is moved from a first position toward a second position. The third lens unit includes not less than three lens components, and not less than three lens components include a first lens component and a second lens component. The first lens component is a single lens and the second lens component is a cemented lens. Following conditional expression (1) is satisfied:−0.60<(22)/2<−0.05  (1).

Wide-angle optical system including three lens units of −++ refractive powers, and image pickup apparatus using the same

A microscope objective includes three groups that are in a positive-negative-positive configuration. The first lens group includes a plurality of cemented lenses, and includes, closest to the object, a meniscus lens having its concave surface on the object side. The second lens group includes a first meniscus lens component having its concave surface on the image side and a second meniscus lens component having its concave surface on the object side. At least one of the lens components of the third lens group is a cemented lens.

Microscope objective

A single-focus optical system includes a front lens unit and a rear lens unit. The front lens unit either includes a predetermined sub lens unit or includes an enlargement-side sub lens unit and a predetermined sub lens unit. The rear lens unit includes a first sub lens unit, a second sub lens unit, a third sub lens unit, and a fourth sub lens unit. The enlargement-side sub lens unit includes a negative lens component. The predetermined sub lens unit includes an enlargement-side meniscus lens component and a reduction-side meniscus lens component. The first sub lens unit includes positive lenses and a first predetermined negative lens. The second sub lens unit includes a predetermined negative lens component. The third sub lens unit includes a predetermined positive lens component. The fourth sub lens unit includes all lens components positioned on the reduction side of the predetermined positive lens component.

Single-focus optical system and optical apparatus using the same

A single-focus optical system includes a first lens unit having a positive refractive power, a second lens unit having a negative refractive power, and a third lens unit having a positive refractive power. The first lens unit includes either a first sub unit, a second sub unit, and a third sub unit, or one positive lens component in addition to the first sub unit, the second sub unit, and the third sub unit. The first sub-unit includes one negative lens component or a plurality of negative lens components, the second sub-unit includes two meniscus lens components, and the third sub-unit includes a plurality of positive lens components. The third lens unit includes a front side sub-unit and a rear side sub-unit. The front side sub-unit includes only a positive lens component.

A single-focus optical system includes in order from an enlargement side, a first lens unit, and a second lens unit having a positive refractive power. A lens component is one of a single lens and a cemented lens. The first lens unit includes a reduction-side negative lens component closest to the reduction side, and in addition, the first lens unit includes not less than three negative lens components including the reduction-side negative lens component. The second lens unit includes in order from the enlargement side, a front side sub-unit and a rear side sub-unit. The front side sub-unit includes only a positive lens component, and the rear side sub-unit includes at least a negative lens.

A single-focus optical system includes a first lens unit having a negative refractive power, a second lens unit having a positive refractive power, and a third lens unit having a positive refractive power. The first lens unit includes a reduction-side lens component closest to the reduction side, and a shape of the reduction-side lens component is a meniscus shape having a convex surface directed toward the enlargement side. The second lens unit includes a cemented lens of a meniscus shape having a convex surface directed toward the reduction side, and a plurality of positive lens components. The cemented lens in the second lens unit includes a negative lens and a positive lens. The third lens unit includes a negative lens component closest to the enlargement side. All air spaces in the first lens unit and in the second lens unit are constant at the time of focusing.

Single focus optical system and optical apparatus using the same

A single-focus optical system includes a first lens unit having a positive refractive power, a second lens unit having a negative refractive power, and a third lens unit having a positive refractive power. The first lens unit includes at least a first sub-unit, a second sub-unit, and a third sub-unit. The first sub-unit includes one of, a one negative lens component and a plurality of negative lens components that are continuous, the second sub-unit includes two meniscus lens components having respective concave surfaces thereof facing mutually, and the third sub-unit includes a plurality of positive lens components disposed closest to the reduction side in the third sub unit. The second lens unit includes one negative lens component. The third lens unit includes negative lens, and also includes a positive lens component closest to the enlargement side. All air spaces in the first lens unit are constant.

A single-focus optical system includes a first lens unit having a positive refractive power, a second lens unit having a negative refractive power, and a third lens unit having a positive refractive power. The first lens unit includes at least a first sub-unit, a second sub-unit, and a third sub-unit. The first sub-unit includes a negative lens component, the second sub-unit includes two meniscus lens components, and the third sub-unit includes a plurality of positive lens components. The third lens unit includes a front side sub-unit and a rear side sub-unit, and the front side sub-unit includes only a positive lens component. At the time of focusing, the first lens unit is fixed, the second lens unit is movable, and the rear side sub-unit is fixed.

A single-focus optical system includes in order from an enlargement side, a first lens unit, and a second lens unit having a positive refractive power. A lens component is one of a single lens and a cemented lens. The first lens unit includes a reduction-side negative lens component closest to the reduction side, and in addition, the first lens unit includes not less than three negative lens components including the reduction-side negative lens component. The second lens unit includes in order from the enlargement side, a first positive lens, a second positive lens, a first negative lens, and a third positive lens, and all airspaces in the second lens unit are constant at a time of focusing.

A zoom lens includes in order from an object side, a first lens unit having a negative refractive power, a second lens unit having a positive refractive power, and a third lens unit having a negative refractive power, and at the time of zooming, movement of the first lens unit includes at least a movement toward an image side, the second lens unit moves integrally with an aperture stop, and the third lens unit moves toward the object side, and the first lens unit includes at least a negative lens and a positive lens, and the negative lens is disposed nearest to an object, and the following conditional expressions are satisfied:0.75&#x3c;(&#x3b2;/&#x3b2;)/(&#x3b2;/&#x3b2;)&#x3c;1.38&#x2212;0.70&#x3c;&#x3b2;&#x3c;&#x2212;0.320.96&#x3c;&#x3c;1.80.

Zoom lens and lens barrel and image pickup apparatus using the same

An imaging optical system includes an aperture stop, a first cemented lens, a second cemented lens, and a third cemented lens, and the first cemented lens is positioned closer to the enlargement side than the aperture stop is, the second cemented lens is positioned on the reduction side and adjacent to a predetermined lens unit is, and the third cemented lens is positioned closer to the reduction side than the aperture stop is, the predetermined lens unit has a negative refractive power and includes all of lenses located from a lens positioned closest to the enlargement side to the first cemented lens, the first cemented lens includes a positive lens and a negative lens, the second cemented lens includes a negative lens and a positive lens, and the third cemented lens includes a positive lens and a negative lens.

Imaging optical system and optical apparatus including the same

An optical system which forms an optical image on an image pickup element, comprising in order from an object side,

Optical system and optical instrument, image pickup apparatus, and image pickup system using the same

An imaging optical system includes, a first lens unit having a negative refractive power, a second lens unit having a positive refractive power, a third lens unit having a negative refractive power, and a fourth lens unit having a positive refractive power, the first lens unit includes a first negative lens and a first cemented lens, the second lens unit Gincludes a second cemented lens, one or more positive lens components, and a third cemented lens, and the first cemented lens includes a negative lens and has a surface having a concave surface facing toward the reduction side, the second cemented lens has a positive refractive power and has a surface having a concave surface facing toward the enlargement side, and the third cemented lens has a positive refractive power and includes a negative lens on the reduction side.

Growing community of inventors

Tama, Japan

Keisuke Ichikawa