Olympus Imaging Corporation

Masato Miyata

Nobumasa Kanbayashi

Naoki Fujii

Yuki Kubota

Kouki Hozumi

Kunio Yamamiya

Keisuke Ichikawa

Tomoyuki Satori

Satoru Yasutomi

Masahito Ohashi

Manabu Yoshii

Ichikawa Keisuke

Provided is a lens barrel having, in order from an object side to an image side, a first to a third group lens, the lens barrel including: a fixed frame; a cam frame supported by the fixed frame so as to be rotationally movable in a optical axis direction between a forward and a backward movement ends; and a shutter frame which moves in the optical axis direction in a rotation restricted state, through the rotation of the cam frame, in which: a third group frame is fixed to the shutter frame so that the object side of the third group lens is arranged on an inner peripheral side of the shutter frame; and the second frame is configured so that the image side of the frame is stored on the inner peripheral side of the shutter frame when the cam frame is positioned at the backward movement end.

Lens barrel and image pickup device

A zoom lens system includes in order from an object side to an 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 positive refracting power; and a fourth lens unit having a positive refracting power. At the time of zooming from a wide angle end to a telephoto end, each of distances between the first lens unit and the second lens unit, between the second lens unit and the third lens unit, and between the third lens unit and the fourth lens unit is changed, and the first lens unit is moved. The first lens unit includes a lens component having positive refracting power, a total number of lens components included in the first lens unit is one, and the third lens unit includes five lens elements.

Zoom lens system and image pickup apparatus using the same

An image pickup apparatus includes a zoom lens having a first positive lens unit, and a first negative lens unit disposed on an object side of the first positive lens unit. A distance between the first positive lens unit and the first negative lens unit is narrowed at the time of zooming from a wide angle end to a telephoto end. The zoom lens includes an aperture stop disposed between a lens nearest to an image side in the first negative lens unit and a lens nearest to the image side in the first positive lens unit, and a light-amount reducing filter made of a resin material which is disposed on the image side of the lens nearest to the image side in the first positive lens unit, and which can be inserted in an optical path and withdrawn from the optical path. The zoom lens satisfies predetermined conditional expressions.

Image pickup apparatus using zoom lens

A zoom lens includes a negative first lens unit Gand a positive second lens unit G. The second lens unit Gincludes first and second cemented lens components that are arranged adjacent to each other. The first and second cemented lens components are each made up of a plurality of lens elements having different refractive indices and different Abbe constants. The image side surface of the first cemented lens component and the object side surface of the second cemented lens component are both concave surfaces.

Zoom lens and image pickup apparatus equipped with same

A zoom lens system includes in order from an object side to an image side, 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, and a fourth lens unit Ghaving a positive refracting power. At the time of zooming from a wide angle end to a telephoto end, distances between the lens units change. The third lens unit includes a first cemented lens component having a concave image-side surface on the image side, and a second cemented lens component having a concave object-side surface on the object side, which is disposed immediately after the image side of the first cemented lens component. The first cemented lens component includes a positive lens, and a negative lens having a concave image-side surface which is disposed on the image side of the positive lens. The second cemented lens component includes a negative lens having a concave object-side surface on the object side, and a positive lens which is disposed on the image side of the negative lens.

A zoom lens includes, in order from the object side, a first lens unit with negative power, a second lens unit with positive power, a third lens unit with positive power, and a fourth lens unit. When the magnification of the zoom lens is changed in the range from a wide-angle position to a telephoto position, spacing between the first lens unit and the second lens unit is narrowed and spacing between the second lens unit and the third lens unit is widened. An aperture stop moved integrally with the second lens unit is interposed between the most image-side lens element of the first lens unit and the most image-side lens element of the second lens unit. The first lens unit has, in order from the object side, a negative lens element and a positive lens element and satisfies the following conditions:0.15&#x3c;&#x3c6;/&#x3c6;&#x3c;1.0&#x2212;3.0&#x3c;&#x3c6;/&#x3c6;&#x3c;&#x2212;1.0where &#x3c6;is the power of the object-side surface of the negative lens element, &#x3c6;is the power of the image-side surface of the negative lens element, &#x3c6;is the power of the object-side surface of the positive lens element, and &#x3c6;is the power of the image-side surface of the positive lens element.

Zoom lens and electronic imaging apparatus using the same

The invention relates to a zoom lens and an imaging apparatus, and more particularly to a slimmed-down zoom lens well fit for imaging apparatus inclusive of video cameras and digital cameras. The zoom lens comprises, in order from its object side, a first lens group having negative refracting power, a second lens group having positive refracting power, a third lens group having negative refracting power and a fourth lens group having positive refracting power. The first lens group consists of one negative component wherein one negative lens and one positive lens are cemented together. Upon zooming from the wide-angle end to the telephoto end and the second lens group moves toward the object side with a decreasing spacing between the first lens group and the second lens group, a changing spacing between the second lens group and the third lens group and a changing spacing between the third lens group and the fourth lens group.

Zoom lens and imaging apparatus

The invention relates to a zoom lens favorable for offering a tradeoff between slimming down a lens system upon received in an associated lens mount and making sure a small F-number. There is a zoom lens provided, which comprises, in order from its object side, a first lens group Ghaving negative refracting power, a second lens group Ghaving positive refracting power, and a third lens group Ghaving positive refracting power. Upon zooming from a wide-angle end to a telephoto end, the first second and third lens groups GGand Geach move along an optical axis while a spacing between the first lens group and the second lens group becomes narrow and a spacing between the second lens group and the third lens group becomes wide. The first lens group Gcomprises one single lens that is a double-concave negative lens or two lenses: a double-concave negative lens and a positive lens. The second lens group Gcomprises two positive lenses and one negative lens. At least one of the positive lenses has an aspheric lens surface. The zoom lens satisfies condition (1) that defines the relation between the total length of the lens system and the height of a marginal ray at the entrance surface in the first lens group G

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Machida, Japan

Masato Miyata