Olympus Imaging Corporation

Olympus Corporation

Hideyuki Nagaoka

Kenji Ono

Masaru Morooka

Masahiro Katakura

Tomoyuki Satori

Kazuya Nishimura

Kazuteru Kawamura

Eiji Shirota

Masato Katayose

Kazuhito Hayakawa

Yasushi Namii

Koji Nakagawa

Koki Hozumi

An observation device includes a light source unit capable of adjusting a quantity of 390-490 nm illuminating light according to a B1 range and a B2 range having a longer wavelength than the B1 range, and an imaging element that images reflected light from a subject irradiated with illuminating light. The light source unit changes the light quantity ratio of the B1 range to the B2 range depending on whether white light imaging is conducted or narrow band imaging is conducted. The imaging element includes RGB color filters arranged according to pixels and the R color filter transmits more light in an R range and the B1 range than light in the second B range and has a spectral characteristic that satisfies a predetermined conditional formulae.

Observation device

An observation apparatus including: a light source unit that generates illumination light by using a plurality of solid-state illumination devices; an image-acquisition device that acquires an image of an object illuminated with the illumination light; an image processing unit that processes acquired image signals; and a control unit that controls the light source unit and/or the image processing unit. One of the illumination devices has a peak in a G channel, another one of the illumination devices has a peak in an R channel, and, when increasing and reducing the amount of the illumination light, the control unit performs control so as to satisfy &#x394;Sr/&#x394;Sg&#x3e;1 and &#x394;Sr/&#x394;Sg&#x3c;1, respectively, where &#x394;Sr and &#x394;Sg are rates of change of system gains applied to the R and G channels, respectively.

Observation apparatus

A zoom lens includes a first lens group of positive refractive power; a second lens group of negative power; a third lens group of positive power; a fourth lens group of negative power, and a fifth lens group of positive power arranged from the object side to the image side. At activation of variable power from the wide angle end to the telescopic end, the first, third, fourth and fifth lens groups moves so as to get closer to the object side or the image side at the telescopic end than at the wide angle end; and a gap between the first lens group and the second lens group increases; a gap between the second lens group and the third lens group decreases; a gap between the third lens group and the forth lens group increases; and a gap between the forth lens group and the fifth lens group increases.

Zoom lens and image pickup apparatus having the same

A zoom lens includes, in order from the object side to the image side, a first lens unit having a positive refracting power and including a reflecting member having a reflecting surface, a second lens unit having a negative refracting power, a rear lens unit group having a positive refracting power as a whole and including at least three lens units, which includes in order from the object side, a third lens unit, a fourth lens unit, and a fifth lens unit. An aperture stop is provided between the second lens unit and the fourth lens unit. During zooming from the wide angle end to the telephoto end, the first lens unit is kept stationary, the second lens unit is located closer to the image side at the telephoto end than at the wide angle end, and the distances between the lens units change. The first lens unit includes, in order from the object side, a negative lens component, the reflecting member, and a rear sub-lens unit including a first positive lens element and a second positive lens element. The second lens unit includes a plurality of lens elements including a negative lens element. The zoom lens satisfies certain conditions.

Zoom lens system for image pickup apparatus

The attachment lens device AL,can be mounted between a master lens ML,having a focusing lens group that moves in an optical axis direction for focusing purposes and a camera bodyhaving an imaging device. The attachment lens device AL,comprises a communication portioncommunicatable with the master lens ML,and the camera body, a wobbling lens group LW capable of reciprocally wobbling in the optical axis direction for detecting a direction of moving the wobbling lens group, and a wobbling drive portionfor driving the wobbling lens group Lw.

Attachment lens device, and imaging apparatus incorporating the same

An apparatus includes a zoom lens and an image pickup element. The zoom lens includes an optical path reflecting lens group including a reflecting member and having a positive refracting power, a movable negative lens group that is disposed in the optical path on the image side of the optical path reflecting lens group, has a negative refracting power, and moves during zooming, a movable positive lens group that is disposed in the optical path on the image side of the movable negative lens group, has a positive refracting power, and moves during zooming, and an aperture stop disposed in the optical path between the movable negative lens group and the movable positive lens group. The optical path reflecting lens group is a lens group located closest to the object side in the zoom lens.

Image pickup apparatus

A zoom lens includes, in order from the object side, an object side lens group having a negative refracting power at the wide angle end and including at least one negative lens unit, and an image side lens group having a positive refracting power at the wide angle end and including at least one positive lens unit including a cemented doublet lens component. The distance between the two lens groups is smaller at the telephoto end than at the wide angle end. The cemented doublet lens component includes, in order from the object side, a negative object side lens having a concave surface facing the image side, and positive image side lens having a meniscus shape with a concave surface facing the image side. The cemented doublet lens component is located closest to the image side in the positive lens unit. The zoom lens satisfies specific conditions.

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 having a negative refracting power, a second lens unit having a positive refracting power, a third lens unit having a negative 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, distances between the lens units change by at least the first lens unit, the second lens unit, and the third lens unit being moved. The second lens unit includes in order from the object side, a first sub-unit having a positive refracting power, a second sub-unit having a negative refracting power, and a third sub-unit having a positive refracting power. A surface on the object side and a surface on an image side of each of the first sub-unit, the second sub-unit, and the third sub-unit are in contact with air, and (the zoom lens system) satisfies the following conditional expression (1).3.2&#x3c;(&#x3b2;/&#x3b2;)/(&#x3b2;/&#x3b2;)&#x3c;7&#x2003;&#x2003;(1)

Zoom lens system and image pickup apparatus using the same

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 invention relates to a small-format, low-cost zoom lens that can gain sufficient telecentricity and aberration performance even with the use of an inexpensive vitreous material, and so lends itself to an electronic image pickup device. The zoom lens comprises a first lens group Gof negative refracting power, a second lens group Gof positive refracting power and a third lens group Gof positive refracting power. For zooming, the lens groups are moved with a change in the spacing between adjacent lens groups. The second lens group Gcomprises a first lens of positive refracting power, a second lens of positive refracting power and a third lens group of negative refracting power, and has three lenses in all. The third lens group Gcomprises a positive lens that is of meniscus shape convex toward an image plane of the zoom lens system and satisfies condition (3), n&#x2266;1.53.

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Hino, Japan

Hideyuki Nagaoka