Olympus Corporation

Olympus Optical Company, Ltd.

Olympus Imaging Corporation

Ayami Imamura

Shinichi Mihara

Masahito Watanabe

Tetsuhide Takeyama

Toyoharu Hanzawa

Atsujiro Ishii

Hirokazu Konishi

Takahiro Amanai

Hitoshi Ohashi

Yasuharu Yamada

Yuko Kobayashi

Toru Miyajima

Keigo Matsuo

Noriyuki Iyama

Yasuhiro Kamihara

Tetsuya Ishii

An image pickup apparatus includes an image forming optical system which includes an aperture stop that sets an axial light beam, and a diffracting optical surface disposed at a position different from a position where the aperture stop is disposed, and an imager which is disposed on an image side of the image forming optical system, and has a light-receiving surface which is not flat and is curved to be concave toward the image forming optical system, wherein the diffracting optical surface satisfies the following conditional expression (1).0.1&#x3c;||&#x2264;1.0&#x2003;&#x2003;(1)

Image pickup apparatus and capsule endoscope

An image pickup apparatus includes an image forming optical system having an aperture stop, a first lens, and a second lens, and an imager having a light-receiving surface that is curved to be concave toward the image forming optical system, and a relative partial dispersion for a medium of the first lens differs from a relative partial dispersion for a medium of the second lens, and when a straight line indicated by &#x3b8;gF=&#x3b1;&#xd7;&#x3c5;d+&#x3b2;(where &#x3b1;=&#x2212;0.00163) has been set, &#x3b8;gFand &#x3c5;dfor the medium of the first lens are included in both of an area determined by the following conditional expression (1) and an area determined by the following conditional expression (2), and the following conditional expression (3) is satisfied:0.68&#x3c;&#x3b2;&#x2003;&#x2003;(1),&#x3c5;&#x3c;50&#x2003;&#x2003;(2), and0&#x3c;||&#x2264;1.5&#x2003;&#x2003;(3).

Image pickup apparatus which corrects chromatic aberration in a wide wavelength range, and capsule endoscope

The invention relates to an electronic image pickup system whose depth dimension is extremely reduced, taking advantage of an optical system type that can overcome conditions imposed on the movement of a zooming movable lens group while high specifications and performance are kept. The electronic image pickup system comprises an optical path-bending zoom optical system comprising, in order from its object side, a 1-1st lens group G-comprising a negative lens group and a reflecting optical element P for bending an optical path, a 1-2nd lens group G-comprising one positive lens and a second lens group Ghaving positive refracting power. For zooming from the wide-angle end to the telephoto end, the second lens group Gmoves only toward the object side. The electronic image pickup system also comprises an electronic image pickup device I located on the image side of the zoom optical system.

Electronic image pickup system

The invention relates to an electronic image pickup system whose depth dimension is extremely reduced, taking advantage of an optical system type that can overcome conditions imposed on the movement of a zooming movable lens group while high specifications and performance are kept. The electronic image pickup system comprises an optical path-banding zoom optical system comprising, in order from its object side, a 1-1st lens group G-comprising a negative lens group and a reflecting optical element P for bending an optical path, a 1-2nd lens group G-comprising one positive lens and a second lens group Ghaving positive refracting power. For zooming from the wide-angle end to the telephoto end, the second lens group Gmoves only toward the object side. The electronic image pickup system also comprises an electronic image pickup device I located on the image side of the zoom optical system.

The invention relates to an electronic image pickup system whose depth dimension is extremely reduced, taking advantage of an optical system type that can overcome conditions imposed on the movement of a zooming movable lens group while high specifications and performance are kept. The electronic image pickup system comprises an optical path-bending zoom optical system comprising, in order from its object side, a-st lens group G-comprising a negative lens group and a reflecting optical element P for bending an optical path, a-nd lens group G-comprising one positive lens and a second lens group Ghaving positive refracting power. For zooming from the wide-angle end to the telephoto end, the second lens group Gmoves only toward the object side. The electronic image pickup system also comprises an electronic image pickup device I located on the image side of the zoom optical system.

It is preferable that an image forming optical system includes in order from an object side, a first lens group having a positive refractive power, a second lens group having a negative refractive power, a third lens group having a negative refractive power, and a subsequent lens group having a positive refractive power as a whole, and that the third lens group includes only a cemented lens having a negative refractive power, which includes a positive lens and a negative lens in order from the object side. Moreover, it is preferable that a cemented surface of the cemented lens in the third lens group has a shape which is convex toward an image side.

Image forming optical system and electronic image pickup apparatus using the same

A zoom optical system in which: a positive first lens group, a negative second lens group, a positive third lens group, and a positive fourth lens group are arranged in that order from the object side and magnification is changed by properly changing distances between these lens groups; the first lens group consists of only one lens element and the most object-side surface of the first lens group has a convex shape which faces toward the object side; the second lens group includes, in order from the object side, a negative single lens, a negative cemented lens, and a positive single lens; and the following condition (1) or (2) is satisfied:0.2&#x2266;&#x394;&#x2266;0.35&#x2003;&#x2003;(1)=()/()&#x3e;0&#x2003;&#x2003;(2)where &#x394;Ddenotes the variation in the distance between the first and second lens groups in changing from the wide angle end position to the position in which the focal length is ten times or more as large as that in the wide angle end position, Ldenotes the total length of the optical system in the telephoto end position, SFdenotes the shape factor of the fourth lens group, rdenotes the radius of curvature of the most object-side surface of the fourth lens group, and rdenotes the radius of curvature of the most image-side surface of the fourth lens group.

Zoom optical system and electronic pickup apparatus using the same

A zoom lens according to the present invention includes, in order from the object side to the image side, a first lens unit having a positive refracting power, a second lens unit having a negative refracting power, a third lens unit having a negative refracting power, and a fourth lens unit having a positive refracting power, wherein 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 in such a way that they are located closer the object side at the telephoto end than at the wide angle end, the distance between the first lens unit and the second lens unit is larger at the telephoto end than at the wide angle end, the distance between the second lens unit and the third lens unit is larger at the telephoto end than at the wide angle end, and the distance between the third lens unit and the fourth lens unit is smaller at the telephoto end than at the wide angle end. The zoom lens satisfies a predetermined condition.

Zoom lens and image pickup apparatus equipped with same

An image forming optical system characterized by comprising a positive first lens group, a negative second lens group, and third and subsequent lens groups having a positive composite refracting power, wherein the first lens group is composed of a cemented lens made up of one positive lens and one negative lens arranged in order from the object side, and the image forming optical system satisfies the following conditional expressions (1-1) and (2-1):0.05&#x3c;1&#x3c;0.10&#x2003;&#x2003;(1-1)0.50&#x3c;&#x3b8;&#x3c;0.75&#x2003;&#x2003;(2-1)where T1g is the thickness of the first lens group on the optical axis, Flt is the focal length of the entire image forming optical system at the telephoto end, and &#x3b8;gF is the partial dispersion ratio (ng1&#x2212;nF1)/(nF1&#x2212;nC1) of the negative lens, where nd1, nC1, nF1, and ng1 are refractive indices of the negative lens respectively for the d-line, C-line, F-line, and g-line.

Image forming optical system and electronic image pickup apparatus equipped with same

The invention relates to an electronic image pickup system whose depth dimension is extremely reduced, taking advantage of an optical system type that can overcome conditions imposed on the movement, of a zooming movable lens group while high specifications and performance are kept. The electronic image pickup system comprises an optical path-bending zoom optical system comprising, in order from its object side, a 1-1st lens group G-comprising a negative lens group and a reflecting optical element P for bending an optical path, a 1-2nd lens group G-comprising one positive lens and a second lens group Ghaving positive refracting power. For zooming from the wide-angle end to the telephoto end, the second lens group Gmoves only toward the object side. The electronic image pickup system also comprises an electronic image pickup device I located on the image side of the zoom optical system.

A zoom optical system that comprising: 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 which are arranged in order from an object side, a space between the lens units being changed to perform variation of magnification, the first lens unit includes a negative lens, the second lens unit includes a positive lens and a negative lens in order from the object side, the third lens unit includes a positive lens, and an electronic equipment provided with the zoom optical system.

Zoom optical system and electronic equipment using the same

The invention relates to a zoom optical system that can offer an effective tradeoff between size reductions and cost reductions and electronic equipment incorporating it. The zoom optical system comprises, in order from its object side, a first lens group Ghaving negative refracting power, a second lens group Ghaving positive refracting power, a third lens group Ghaving negative refracting power and a fourth lens group Ghaving positive refracting power. The second lens group Gconsists of one positive lens. The positive lens satisfies a condition regarding the temperature coefficient of refractive index.

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Hachioji, Japan

Ayami Imamura