Olympus Imaging Corporation

Olympus Corporation

Olympus Optical Company, Ltd.

Eiji Shirota

Masashi Hankawa

Masaru Morooka

Kazuteru Kawamura

Masahito Watanabe

Toshio Takahashi

Masahiro Katakura

Tomoyuki Satori

Hirohiko Kimata

Yasutaka Kashiki

Takeshi Hosoya

Tetsuya Toyoda

Akiyoshi Tochigi

Hideyuki Nagaoka

An image pickup apparatus includes: a zoom lens; an image pickup element having an image pickup surface which receives an image which has been formed by the zoom lens, and converts to an electric signal; a shading correction parameter storage section which stores a shading correction parameter which differs at a front-surface side and a rear-surface side with respect to a center of an image, which is for correcting asymmetric shading at the front-surface side and the rear-surface side of the zoom lens; and a shading correction section which carries out correction operation of an image which has been picked up by the image pickup element, based on the shading correction parameter of the shading correction parameter storage section. When an object having a uniform brightness is captured, at any state from the wide angle end to the telephoto end, the zoom lens satisfies conditional expression (A).

Image pickup apparatus having optical path reflecting zoom lens

An image pickup apparatus includes a zoom lens, and an image pickup element having an image pickup surface which receives optically an image formed by the zoom lens, and which converts the image received to an electric signal. The image pickup apparatus satisfies the following conditional expressions (1) Lv 1 Er/Lv 1 EL&#x3c;0.49, (2) 0.93&#x3c;Lv 1 Ef/IHs, and (3) Lv 1 Ef/Lv 1 Er&#x3c;0.99.

A zoom lens includes, in order from the object side thereof, a first lens unit having a positive refracting power, a second lens unit having a negative refracting power, a third lens unit having a positive refracting power, a fourth lens unit having a positive refracting power, and a fifth lens unit having a negative refracting power. During zooming from the wide angle end to the telephoto end, the first lens unit and the third lens unit are kept stationary with respect to the image plane, and at least the second lens unit and the fourth lens unit move. The first lens unit includes, in order from the object side, a first sub unit having a negative refracting power, a reflecting optical element that bends an optical path by reflection, and a second sub unit having a positive refracting power. The second sub unit includes a cemented lens.

Zoom lens and image pickup apparatus equipped with same

A two-unit zoom lens system which forms an image on an image pickup surface, includes in order from an object side to an image side, a first lens unit Ghaving a negative refracting power and a second lens unit Ghaving a positive refracting power. At the time of zooming from a wide angle end to a telephoto end, a distance between the first lens unit and the second lens unit is narrowed. The first lens unit includes in order from the object side to the image side, a first lens having a negative refracting power, a second lens having a negative refracting power, and a third lens having a positive refracting power, and the two-unit zoom lens system satisfies predetermined conditional expressions.

Two-unit zoom lens system and image pickup apparatus using the same

An electronic imaging apparatus includes a zoom optical system having, in order from the object side, a first lens unit with positive power, a second lens unit with negative power, and an aperture stop, in which the first lens unit is composed of a single positive power unit and the second lens unit has a single negative lens element located at the most object-side position, both surfaces of which are concave, and a positive lens component located at the most image-side position; an electronic image sensor located on the image side of the zoom optical system; and an image processing section electrically processing image data obtained by the electronic image sensor to change the form thereof.

Zoom optical system and electronic imaging apparatus having the same

An electronic image pickup apparatus comprising a zoom lens system and an image pickup device disposed on an image side of the zoom lens system and which converts an image formed by the zoom lens system into an electric signal, the zoom lens system having, in order from an object side, a negative first lens unit, a positive second lens unit, a negative third lens unit, and a positive fourth lens unit, the first lens unit having, in order from the object side, a negative lens and a reflective optical element which reflects an optical path, and during zooming from a wide-angle end to a telephoto end, each space between the lens units which are adjacent with each other being changed, the first lens unit being arranged in a fixed position to the image pickup device, and at least the second lens unit and the third lens unit being moved.

Electronic image pickup apparatus

The invention relates to a zoom lens that enables an optical path to be easily bent by a reflecting optical element, has a wide-angle design and high optical performance as represented by a high zoom ratio of about 3.4, is extremely slimmed down in the depth direction, and costs less. The zoom lens comprises a positive first lens group G, a negative second lens group G, a positive third lens group G, a positive fourth lens group Gand a negative fifth lens group G. Upon zooming from the wide-angle end to the telephoto end, the first lens group Gremains substantially fixed with respect to an image plane I, and at least the second Gand the fourth lens group Gmove. The first lens group Gincludes a reflecting optical element for bending the optical path involved, and a portion of the first lens group Gon an object side with respect to the reflecting surface has negative refracting power. The zoom lens satisfies condition (1) with respect to the focal length of the fifth lens group G

Zoom lens and imaging system using the same

An image pickup apparatus having an optical path reflecting zoom lens system includes a zoom lens system, and an image pickup element which is disposed at an image side of the zoom lens system. The zoom lens system includes in order from an object side thereof a first lens unit Ghaving a positive refracting power, which includes a reflecting optical member having a reflecting surface which reflects an optical path, a second lens unit Ghaving a negative refracting power, a third lens unit Ghaving a positive refracting power, a fourth lens unit Ghaving a positive refracting power, and an aperture stop S which is disposed between the second lens unit Gand the fourth lens unit G. The first lens unit Ghas a position fixed with respect to a position of the image pickup element. At least the second lens unit Gand the fourth lens unit Gmove and the zooming is carried out from a wide angle end to a telephoto end by changing a distance between each of lens units. The second lens unit Gincludes in order from the object side thereof, a negative lens, a positive lens, and a negative lens.

Image pickup apparatus having optical path reflecting zoom lens system

An image pickup apparatus having a wide angle zoom lens system includes a zoom lens system, and an image pickup element which is disposed at an image side of the zoom lens system. The zoom lens system includes in order from an object side thereof, a first lens unit Ghaving a positive refracting power, a second lens unit Ghaving a negative refracting power, a third lens unit Ghaving a positive refracting power, a fourth lens unit Ghaving a positive refracting power, and an aperture stop S which is disposed between the second lens unit Gand the third lens unit G. A zooming is carried out from a wide angle end to a telephoto end by fixing a position of the first lens unit, and changing a distance between the lens units by moving at least the second lens unit Gand the third lens unit G, and the following conditional expressions are satisfied.33&#xb0;&#x3c;tan()&#x2003;&#x2003;(1)3&#x3c;&#x3c;5&#x2003;&#x2003;(2).

Image pickup apparatus having wide angle zoom lens system

The present invention relates to a low-cost zoom lens which has high optical performance specifications such as a wide angle of view and a high zoom ratio of as high as 5, is extremely small in depth and ensures that the optical path of the optical system can easily be bent by a reflecting optical element. A zoom lens includes a first lens group Gwith a positive power, a second lens group Gwith a negative power, a third lens group Gwith a positive power, a fourth lens group Gwith a positive power, a fifth lens group Gwith a negative power, and a sixth lens group Gwith a positive power, wherein upon zooming from a wide-angle end to telephoto end, the first lens group Gremains fixed relative to an image surface I and at least second and fourth lens groups Gand Gmove, the first lens group Gincludes, in order from the object side, a negative lens, a reflecting optical element P for bending an optical path, and a positive lens, and conditional expression (1) is satisfied.

Zoom lens and imaging apparatus using the same

There is disclosed an electronic image pickup apparatus including an aperture stop disposed on an optical path reflected by a reflective surface of a first lens unit and having a non-circular aperture in a state in which an area of an aperture of the aperture stop is maximized, and a lens arranged closest to an image side on an optical path extending from the reflective surface to an image surface and having a non-circular shape, each of the shape of the non-circular aperture of the aperture stop and the outer shape of the lens is formed such that a length of the aperture which in a direction along an incident optical axis which enters the first lens unit is smaller than that of which in a direction vertical to the incident optical axis which enters the first lens unit and a reflected optical axis reflected by the reflective surface.

Electronic image pickup apparatus using zoom lens system

A zoom lens system comprises, in order from an object side, a positive first lens unit including a reflective optical element, a negative second lens unit, a positive third lens unit and a positive fourth lens unit, or a positive first lens unit, a negative second lens unit, a positive third lens unit, a negative fourth lens unit and a positive fifth lens unit. During zooming from a wide-angle end toward a telephoto end, the first lens unit is fixed, at least the second and third lens units move, and a space between the lens units changes. The second lens unit is positioned closer to an image-surface side in the telephoto end than in the wide-angle end, and the third lens unit is positioned closer to the object side in the telephoto end than in the wide-angle end. An image taking apparatus including the zoom lens system is also disclosed.

Optical path bending type zoom lens system and image taking apparatus including the same

There is disclosed a zoom lens system including, 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 fourth lens unit having a positive refractive power, and further including an aperture stop S disposed between the second lens unit and the third lens unit, during zooming from a wide-angle end to a telephoto end, a space between the lens units is changed, the first lens unit includes a single lens having a negative refractive power, a reflective optical element having a reflective surface which reflects an optical path and a sub unit having a positive refractive power, and the zoom lens system satisfies predetermined conditions.

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Hino, Japan

Eiji Shirota