Olympus Imaging Corporation

Olympus Optical Company, Ltd.

Olympus Corporation

Masashi Hankawa

Eiji Shirota

Kazuteru Kawamura

Tomoyuki Satori

Toru Miyajima

Kouki Hozumi

Kazuya Nishimura

Toshio Takahashi

Masahito Watanabe

Masaru Morooka

Takahiro Amanai

Takanori Yamanashi

Norihiko Aoki

Akiyoshi Tochigi

Masaki Imaizumi

Tomoko Sato

Yuji Ogasawara

Yoshihiro Matsumoto

Tetsuhisa Asai

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

A zoom lens is composed, in order from the object side thereof, of a front side lens unit having a negative refracting power at the wide angle end and a rear side lens unit having a positive refracting power at the wide angle end. The front side lens unit includes a first lens unit located closest to the object side and having a positive refracting power and a second lens unit located on the image side of the first lens unit and having a negative refracting power. 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 rear side lens unit includes a third lens unit located closer to the object side at the telephoto end than at the wide angle end and having a positive refracting power, the distance between the third lens unit and the second lens unit being smaller at the telephoto end than at the wide angle end. The third lens unit satisfies the following condition: 0.01&#x3c;f/f&#x3c;0.16 . . . (1).

Zoom lens and image pickup apparatus equipped with same

A zoom lens is composed, in order from the object side thereof, of a front side lens unit having a negative refracting power at the wide angle end and a rear side lens unit having a positive refracting power at the wide angle end. The front side lens unit includes a first lens unit located closest to the object side and having a positive refracting power and a second lens unit located on the image side of the first lens unit and having a negative refracting power. 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 rear side lens unit includes a third lens unit located closer to the object side at the telephoto end than at the wide angle end and having a positive refracting power, the distance between the third lens unit and the second lens unit being smaller at the telephoto end than at the wide angle end. The third lens unit satisfies the following condition:0.01&#x3c;&#x3c;0.16&#x2003;&#x2003;(1).

A zoom lens 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 lens unit having a positive refractive power. During zooming from a wide-angle end to a telephoto end, a space between the first lens unit and the second lens unit narrows, at least the second lens unit moves only toward the object side, and the third lens unit is constituted of one positive lens.

Zoom lens system and electronic image pickup apparatus using the same

The invention relates to a zoom lens and an imaging apparatus incorporating the same. The zoom lenses comprises, in order from its object side, a positive first lens group G, a negative second lens group G, a positive third lens group G, and a positive fourth lens group G. Zooming is implemented by changing the spacing between the respective lens groups. Upon received in a lens mount, the third lens group is shifted and positioned while its optical axis is tilted at an angle of &#xb1;45&#xb0; with those of other lens groups or placed substantially horizontal. At least one of lenses in the second lens group Gor the fourth lens group Gis configured such that a portion of that lens proximate to the third lens group being received in the lens mount is cut away. The following condition (1) is satisfied:0.3&#xd7;()&#x3c;3.0&#x2003;&#x2003;(1)where d is a distance between the center point of axial thickness of the third lens group being received in the lens mount and the optical axis, Fis an F-number at a telephoto end, and fis a focal length at the telephoto end.

Zoom lens and imaging apparatus incorporating the same

A zoom lens comprises, in order from its object side, a first lens group of positive refracting power, a second lens group of negative refracting power, and a third lens group of positive refracting power located on an image side with respect to the second lens group. Upon zooming from the wide-angle end to the telephoto end, the spacing between the first lens group and the second lens group grows wider at the telephoto end than at the wide-angle end, and the spacing between the second lens group and the third lens group becomes narrower at the telephoto end than at the wide-angle end. The first lens group comprises a negative lens and a positive lens, and the number of the negative lens in the first lens group is only one. At least one positive lens in the first lens group satisfies the following conditions (1) and (2):1.80&#x3c;ndlp&#x3c;2.0&#x2003;&#x2003;(1)50.0&#x3c;&#x3bd;dlp&#x3c;70.0&#x2003;&#x2003;(2)where ndlp is the d-line refractive index of the at least one positive lens in the first lens group, and &#x3bd;dlp is the Abbe constant of the at least one positive lens in the first lens group.

A zoom lens comprises, in order from its object side, a front lens group having negative refracting power at a wide-angle end and a rear lens group having positive refracting power at the wide-angle end. The front lens group comprises, in order from the object side, a first lens group of positive refracting power and a second lens group of negative refracting power, and the rear lens group comprises, in order from the object side, a third lens group of positive refracting power and a fourth lens group of positive refracting power. There is an aperture stop interposed between the lens surface located in, and nearest to the object side of, the second lens group and the lens surface located in, and nearest to the image size of, the third lens group. Upon zooming from the wide-angle end to the telephoto end, the spacing between the first lens group and the second lens group grows wide, the spacing between the second lens group and the third lens group becomes narrow, the spacing between the third lens group and the fourth lens group changes, and an F-number grows greatest when the aperture stop is open in the course of zooming from the wide-angle end to the telephoto end.

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 three-unit zoom lens system comprising, 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 positive or negative refractive power, wherein during magnification change from a wide-angle end to a telephoto end, a space between the first lens unit and the second lens unit narrows, the second lens unit and the third lens unit move toward the only object side, and a space between the second lens unit and the third lens unit changes during a focusing operation.

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 negative power and a second lens unit with positive power, in which lens components having refracting power in the first lens unit are only a single biconcave negative lens element located at the most object-side position and a positive lens component located at the most image-side position; an electronic image sensor placed 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 shape thereof. The zoom lens system satisfies the following conditions in focusing of a nearly infinite object point:0.85&#x3c;|y/(f&#xb7;tan &#x3c9;)|&#x3c;0.970.75&#x3c;|y/(f&#xb7;tan &#x3c9;)|&#x3c;0.93where fis the focal length of the entire zoom optical system at a wide-angle position, yis a distance from the center of an effective imaging surface of the electronic image sensor to a point furthest from the center, yis an image height expressed by 0.7 y, and &#x3c9;is an angle made by a direction of an object point corresponding to an image point, connecting the center of the effective imaging surface of the electronic image sensor at the wide-angle position and the position of the image height y, with the optical axis.

Electronic imaging apparatus

A zoom lens system comprising, a first negative lens unit; a second positive lens unit; and a third negative lens unit, wherein a space between the second and third lens units changes during magnification change or focusing operation; the second lens unit and the third lens unit move only to the object side during the magnification change from a wide-angle end to a telephoto end so that a space between the first and second lens units is narrower in the telephoto end than in the wide-angle end; the first lens unit comprises a negative lens and a positive lens; the second lens unit comprises at most three lenses; the third lens unit comprises a negative lens; and the following condition (1) is satisfied:0.7&#x3c;()/()&#x3c;1.2. &#x2003;&#x2003;(1)

The invention relates to a four- or five-group zoom lens that ensures wide-angle performance, high zoom ratios and high quality with a more reduced number of lenses than ever before. The zoom lens comprises, in order from its object side, a first lens group Ghaving positive power, a second lens group Ghaving negative power, a third lens group Ghaving positive power, a fourth lens group Ghaving negative power and a fifth lens group Ghaving positive power. The fourth lens group Gcomprises one lens. For zooming, all the spacings between the respective lens groups vary and the first lens group Gmoves in such a way as to arrive at the object side at the telephoto end position rather than at the wide-angle end position.

Wide-angle, high-zoom-ratio zoom lens

A zoom lens system comprises, in order from an object side, positive, negative, positive, negative, and positive refractive power lens groups, and while changing the magnification, the distance between the first lens group and the second lens group increases, the distance between the second lens group and the third lens group decreases, the distance between the third lens group and the fifth lens group increases, and the second lens group moves more towards the object side at the telephoto end than the wide-angle end.

Growing community of inventors

Hachioji, Japan

Masashi Hankawa