Olympus Corporation

Olympus Imaging Corporation

Hirohiko Kimata

Yuji Miyauchi

Yasuharu Yamada

Yasuji Ogata

Toshio Takahashi

Masaru Morooka

Hiroshi Kodama

Eiji Shirota

Kenichi Nagasawa

Kento Kokubu

Kazuteru Kawamura

Akiyoshi Tochigi

Atsujiro Ishii

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 zoom lens comprises a first lens unit Ghaving a positive refractive power, a second lens unit Ghaving a negative refractive power, a third lens unit Ghaving a positive refractive power, a fourth lens unit Ghaving a negative refractive power, a fifth lens unit G, and a sixth lens unit Ghaving a positive refractive power. Zooming from a wide angle end to a telephoto end is carried out by changing a distance between the lens units, and a distance between the first lens unit Gand the third lens unit Gnarrows at the telephoto end than at the wide angle end, and the first lens unit Gis stationary at the time of zooming from the wide angle end to the telephoto end, and lens units from the second lens unit Gto the fifth lens unit Gmove.

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

The invention relates to an image pickup system comprising an electronic view finder suitable for achieving compactness and having a sufficient viewing angle of field and satisfactory optical performance. The image pickup system comprises an image pickup device, an image display device for displaying an image, a controller for converting image formation obtained from the image pickup device into a signal that enables the image information to be formed on the image display device, and a viewing optical system for guiding an image displayed on the display device to a viewer's eye. The viewing optical system comprises at least three lenses.

Image pickup system

The invention relates to an image pickup system comprising an electronic view finder suitable for achieving compactness and having a sufficient viewing angle of field and satisfactory optical performance. The image pickup system comprises an image pickup device, an image display device for displaying an image, a controller for converting image formation obtained from the image pickup device into a signal that enables the image information to be formed on the image display device, and a viewing optical system for guiding an image displayed on the display device to a viewers eye. The viewing optical system comprises at least three lenses.

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

The invention relates to a zoom lens in which tweaks to the mode of movement of lens groups and the first lens group contribute more to making sure the desired zoom ratio and optical performances and ensuring that the whole length of the zoom lens is kept short while carrying it around. The zoom lens comprises a positive first lens group G, a negative second lens group Gand a positive third lens group G, and includes an aperture stop S located between the second Gand the third lens group G. Upon zooming from the wide-angle end to the telephoto end, the first lens group Gmoves in unison, and the second lens group Gmoves in unison. The first Gand the second lens group Gare positioned nearer to the object side at the telephoto end than at the wide-angle end, with an increasing spacing between the first Gand the second lens group Gand a decreasing spacing between the second Gand the third lens group G. The zoom lens satisfies conditions (1) and (2) about the power and the amount of movement of the first lens group G

The invention relates to an imaging system equipped with an electronic viewfinder suitable for compactness and having a sufficient angle of viewing field and satisfactory optical performance, especially the ability to prevent harmful light. The imaging system comprises an image pickup optical system, an image pickup device for receiving a light beam guided by the image pickup optical system, an image display device for displaying an image thereon, a controller for converting image information obtained from the image pickup device into signals capable of being displayed on the image display device, and a viewing optical system for guiding an image appearing on the image display device to a viewer's eye. The viewing optical system comprises, in order from an image display device side, one negative lens and one positive lens.

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Hino, Japan

Hirohiko Kimata