Olympus Imaging Corporation

Olympus Corporation

Tamron Company, Ltd.

Nidek Co., Ltd.

Sankosha Corporation

Optotechno Co., Ltd.

Yasuharu Yamada

Kazuteru Kawamura

Yasuji Ogata

Toshio Takahashi

Akiyoshi Tochigi

Hirohiko Kimata

Toyoki Kon

Hiroshi Kodama

Yasutaka Kashiki

Kenichi Nagasawa

Kento Kokubu

Teruhisa Mitsuo

Masaaki Sato

Tadashi Hirata

Masaru Morooka

Toru Miyajima

Ayami Imamura

Yuki Kubota

Tetsuya Yanai

Takayuki Okawa

Keitaro Yokoyama

Kento Hara

Daichi Murakami

Takeshi Hosoya

Naohide Isogai

Shigehiro Koide

Hideyoshi Saeki

Takuya Ouchi

Hirofumi Yoshihara

Mitsuru Inoue

Asaki Nakane

Takeshi Fujita

Hideyuki Harada

Akihiro Kasai

A zoom optical system includes a front-side lens unit, an intermediate lens unit, and a rear-side lens unit. The front-side lens unit includes a first front unit and a second front unit, and a distance between the first front unit and the second front unit is wider at a telephoto end than at a wide angle end. The intermediate lens unit includes a first intermediate unit and a second intermediate unit, and a distance between the first intermediate unit and the second intermediate unit is narrower at the telephoto end than at the wide angle end. A distance between the second intermediate unit and a lens unit adjacent to the second intermediate unit varies. The second intermediate unit moves at the time of focusing, and the following conditional expressions (1) and (2) are satisfied:0.9&#x2264;&#x2264;1.17&#x2003;&#x2003;(1)4.2&#x2264;&#x2264;20.0&#x2003;&#x2003;(2).

Zoom optical system, image pickup optical system, and image pickup apparatus using the same

An information acquisition apparatus includes an illuminating section, an image forming optical system, and an image pickup element. The image forming optical system includes an incidence-side lens unit having a positive refractive power, an aperture section, and an emergence-side lens unit having a positive refractive power. The incidence-side lens unit and the emergence-side lens unit include a plurality of positive lenses and at least one negative lens, and the following conditional expressions (1) to (9) are satisfied:&#x2212;6&#x3c;&#x3b2;&#x3c;&#x2212;0.8&#x2003;&#x2003;(1)&#x2212;0.5&#x3c;|&#x3c;3.0&#x2003;&#x2003;(2)&#x2212;1.5&#x3c;|&#x3c;0.5&#x2003;&#x2003;(3)0.001&#x3c;|&#x394;&#x3c;0.05&#x2003;&#x2003;(4)0.04&#x3c;|&#x394;&#x3c;0.28&#x2003;&#x2003;(5)3.5&#x3c;|&#x394;|&#x3c;38.0&#x2003;&#x2003;(6)0&#x3c;|&#x394;|&#x3c;0.27&#x2003;&#x2003;(7)0&#x3c;|&#x394;|&#x3c;0.16&#x2003;&#x2003;(8)0&#x3c;|&#x394;|&#x3c;1.1&#x2003;&#x2003;(9).

Information acquisition apparatus

A zoom lens includes in order from an object side, a first lens unit having a positive refractive power, a second lens unit having a negative refractive power, a third lens unit having a positive refractive power, and a first lens component in the predetermined lens unit moves perpendicularly with respect to an optical axis and is fixed at the time of zooming, and a second lens component is disposed, leaving an air space on an image side of the first lens component, and a sign of a refractive power of the second lens component differs from a sign of a refractive power of the first lens component, and the following conditional expression (1) is satisfied.3.4&#x2264;||&#x2264;9&#x2003;&#x2003;(1)

Zoom lens with blur correction and image pickup apparatus using the same

A zoom lens includes in order from an object side, a first lens unit having a positive refractive power, a second lens unit having a negative refractive power, a third lens unit having a positive refractive power, a fourth lens unit having a negative refractive power, and a fifth lens unit having a positive refractive power. The first lens unit includes a positive lens, and the second lens unit includes a positive lens, and the following conditional expressions (1), (2), (3), and (4) are satisfied:&#x2212;0.015&#x2264;&#x2264;0.015&#x2003;&#x2003;(1),70.3&#x2264;&#x3bd;&#x2003;&#x2003;(2),1.76&#x2264;&#x2264;2.3&#x2003;&#x2003;(3), and0.3&#x2264;||&#x2264;0.9&#x2003;&#x2003;(4).

Zoom lens and image pickup apparatus using the same

In a zoom lens of a fixed total length, at the time of changing the magnification from the wide-angle end toward the telephoto end, the first lens group is anchored while the second lens group is moved, and the third and fourth lens groups are moved so as to be located at the object side of the telephoto end relative to the wide-angle end, such that: the interval between the second and third lens groups is decreased at the telephoto end relative to the wide-angle end; the interval between the third and fourth lens groups is increased at the telephoto end relative to the wide-angle end; and the interval between the fourth and fifth lens groups is increased at the telephoto end relative to the wide-angle end, and at the time of focusing a near object point from a remote object point, the second lens group is moved.

Zoom lens

A teleconverter according to the present invention includes a master lens apparatus side mount portion, an image pickup apparatus side mount portion, and a converter lens section having a negative refractive power as a whole. The converter lens section includes in order from an object side to an image side, 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 second lens unit is a lens unit in which, three lenses are cemented, and which includes in order from the object side to the image side, a first lens having a negative refractive power, a second lens having a positive refractive power, and a third lens having a negative refractive power. The teleconverter satisfies predetermined conditional expressions.

Teleconverter and image pickup system using the same

A reflecting telescope optical system comprises, a main reflecting mirror, a sub reflecting mirror which is disposed at a position facing a reflecting surface of the main reflecting mirror, and a plurality of lens units which is disposed at a position facing a reflecting surface of the sub reflecting mirror. The reflecting surface of the main reflecting mirror is a concave surface, and a reflecting area is formed to be ring-shaped. The reflecting surface of the main reflecting mirror and the reflecting surface of the sub reflecting mirror are mutually facing. The first operation is a movement for focusing at an object positioned between infinity and a near position, and the second operation is a reciprocating movement for changing the focused state after focusing. An amount of movement in the first operation is larger than an amount of movement in the second operation.

Reflecting telescope optical system, optical unit, and image pickup apparatus using the same

A method of preparing a resin composition for hard coat, comprises: a first step of obtaining a polyfunctional (meth)acrylate monomer modifying agent by addition reaction between a modifying agent having a thiol group and a three- or more functional (meth)acrylate monomer to form a covalent bond between the thiol group and acryloyl group and/or methacryloyl group, and a second step of modifying metal oxide microparticles with the polyfunctional (meth)acrylate monomer modifying agent that is obtained from the first step.

Method of preparing resin composition for hard coat and resin composition for hard coat

A zoom lens comprising, in order from the object side to the image side a first lens unit having a positive refractive power, a second lens unit having a negative refractive power, a third lens unit having a positive refractive power, a fourth lens unit having a negative refractive power, and a fifth lens unit having a positive refractive power, wherein the first lens unit is located closest to the object side, the fifth lens unit is located closest to the image side, during zooming from the wide angle end to the telephoto end, the first lens unit, the second lens unit, the third lens unit, and the fourth lens unit move, the fifth lens unit is stationary, and the distances between the lens units vary, the third lens includes a positive lens, and the zoom lens satisfies the following condition (1):72&#x3c;&#x3bd;&#x3c;110&#x2003;&#x2003;(1).

Zoom lens and image pickup apparatus equipped with same

The invention provides a zoom lens, characterized by comprising, a zoom lens, which comprises, in order from an object side thereof: a first lens group of negative refracting power, a second lens group of positive refracting power, a third lens group of negative refracting power, and a fourth lens group of positive refracting power, wherein: upon zooming from a wide-angle end to a telephoto end of the zoom lens, a separation between the respective lens groups changes, upon focusing from a focusing-on-infinity state to a close-range focusing state, the third lens group moves in an optical axis direction, and the conditions (1) and (2) are satisfied at the wide-angle end.

Zoom lens, and imaging apparatus incorporating the same

A wide angle optical system including a first lens group of negative refractive power and a second lens group of positive refractive power arranged in the above-mentioned order from the object side. The second lens group includes a cemented doublet SU; an aperture diaphragm; a lens SU; and a biconvex lens Larranged in the above-mentioned order from the object side, and largest ones of air spaces on the axis being front and rear spaces of the aperture diaphragm except the back focal length. The wide angle optical system is divided into the first lens group and the second lens group at the second largest air space operating as a boundary.

Wide angle optical system and image pickup apparatus using the same

An inner focus lens system includes from the object side, a first lens unit having a positive refractive power, an aperture stop, a second lens unit having a positive refractive power, and a third lens unit. The first lens unit includes a plurality of negative lenses and at least one positive lens, the lens located closest to the object side is a negative lens. The second lens unit includes at least one negative lens and at least one positive lens, and moves toward the object side for focusing from an infinite object distance to a close object distance such that the distance between the second lens unit and the aperture stop decreases and that the distance between the second lens unit and the third lens unit increases. The lens system satisfies the following conditions: 1&#x3c;f/f 14 (1), and 0.8&#x3c;f/f&#x3c;3 (2).

Inner focus lens system and image pickup apparatus using the same

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Kanagawa, Japan

Yasuharu Yamada