Olympus Corporation

Olympus Optical Company, Ltd.

Olmypus Corporation

Hirokazu Konishi

Shinichi Mihara

Masahito Watanabe

Tetsuhide Takeyama

Toyoharu Hanzawa

Atsujiro Ishii

Ayami Imamura

Yuji Miyauchi

Takashi Kasahara

Yasushi Fujimoto

Kenichi Kusaka

Kenichiro Abe

Hiroshi Miyajima

Hirofumi Tsuchida

Nobuyuki Nagasawa

Yasuteru Takahama

Motokazu Yamana

Yuso Fujita

Akihiko Hashimoto, Deceased

Masahiro Sakakura

An observation deviceincludes an objective, camera, an observation scope changing device, and a control device. The objectivehaving from 4&#xd7; to 20&#xd7; and including a positive lens group forms an image with light from sample S. The lens group includes a single lens Lhaving a concave surface on an object side and a variable aperture diaphragm. The cameraconverts the image into an image signal. The observation scope changing device performs electronic scaling on the image signal and performs an observation scope changing process. The control device controls the diaphragmin accordance with the observation scope changing process. The observation devicesatisfies a conditional expression is satisfied,3&#x2264;||&#x2264;10where fa is a focal length of single lens Land fGS is a focal length of a lens group from an object plane to the diaphragm

Observation device

An objective includes a first lens group that has a positive refractive power and a second lens group that has a negative refractive power. The objective includes a first negative lens and satisfies0.005&#x2264;&#x2264;0.1&#x2003;&#x2003;(1)0.005&#x2264;&#x2264;0.72&#x2003;&#x2003;(2)10 mm&#x2264;&#x2264;100 mm&#x2003;&#x2003;(3)0.1&#x2264;&#x2264;31&#x2003;&#x2003;(4)when dis a thickness of the first negative lens, his an axial marginal ray height on a lens surface on the object side of the first negative lens, his a minimum value of an axial marginal ray height in the second lens group, his a height of an axial marginal ray on a lens surface of the objective that is situated closest to the image side, L is a length of the objective, and f is a focal length of the objective.

Objective

An immersion objective has a numerical aperture of 1.42 or higher, and includes in order from the object side a positive first lens group, a positive second lens group, and a negative third lens group. The first lens group includes a first cemented lens that includes a plano-convex lens and a first meniscus lens, and a positive lens. The second lens group includes a plurality of cemented lenses. The third lens group includes in order from the object side a second cemented lens that includes a positive lens and a negative lens, a negative lens that has a concave surface facing the object side, and a positive lens. When H is a maximum height of an axial marginal ray, f is a focal length of the objective, and NAis the numerical aperture, the objective satisfies a conditional expression below3.5&#x2264;()&#xd7;NA&#x2264;5.2&#x2003;&#x2003;(1).

Immersion objective

The invention relates to an electronic image pickup system whose depth dimension is extremely reduced, taking advantage of an optical system type that can overcome conditions imposed on the movement of a zooming movable lens group while high specifications and performance are kept. The electronic image pickup system comprises an optical path-bending zoom optical system comprising, in order from its object side, a 1-1st lens group G-comprising a negative lens group and a reflecting optical element P for bending an optical path, a 1-2nd lens group G-comprising one positive lens and a second lens group Ghaving positive refracting power. For zooming from the wide-angle end to the telephoto end, the second lens group Gmoves only toward the object side. The electronic image pickup system also comprises an electronic image pickup device I located on the image side of the zoom optical system.

Electronic image pickup system

An immersion microscope objective includes, a first lens group, a second lens group, and a third lens group, wherein the first lens group has a positive refractive power and includes a first cemented lens disposed nearest to the object side in the first lens group, the second lens group includes a second cemented lens, the third lens group includes a lens component that has a positive refractive power and changes a divergent light beam incident from the second lens group to a convergent light beam, two lens components that change the convergent light beam to a divergent light beam, and a lens component that has a positive refractive power and changes the divergent light beam to a parallel light beam and emits the parallel light beam, and the following conditional expressions (1) is satisfied:60 mm&#x2266;500 mm&#x2003;&#x2003;(1).

Immersion microscope objective and microscope using the same

The invention relates to an electronic image pickup system whose depth dimension is extremely reduced, taking advantage of an optical system type that can overcome conditions imposed on the movement of a zooming movable lens group while high specifications and performance are kept. The electronic image pickup system comprises an optical path-banding zoom optical system comprising, in order from its object side, a 1-1st lens group G-comprising a negative lens group and a reflecting optical element P for bending an optical path, a 1-2nd lens group G-comprising one positive lens and a second lens group Ghaving positive refracting power. For zooming from the wide-angle end to the telephoto end, the second lens group Gmoves only toward the object side. The electronic image pickup system also comprises an electronic image pickup device I located on the image side of the zoom optical system.

The invention relates to an electronic image pickup system whose depth dimension is extremely reduced, taking advantage of an optical system type that can overcome conditions imposed on the movement of a zooming movable lens group while high specifications and performance are kept. The electronic image pickup system comprises an optical path-bending zoom optical system comprising, in order from its object side, a-st lens group G-comprising a negative lens group and a reflecting optical element P for bending an optical path, a-nd lens group G-comprising one positive lens and a second lens group Ghaving positive refracting power. For zooming from the wide-angle end to the telephoto end, the second lens group Gmoves only toward the object side. The electronic image pickup system also comprises an electronic image pickup device I located on the image side of the zoom optical system.

The invention relates to an electronic image pickup system whose depth dimension is extremely reduced, taking advantage of an optical system type that can overcome conditions imposed on the movement, of a zooming movable lens group while high specifications and performance are kept. The electronic image pickup system comprises an optical path-bending zoom optical system comprising, in order from its object side, a 1-1st lens group G-comprising a negative lens group and a reflecting optical element P for bending an optical path, a 1-2nd lens group G-comprising one positive lens and a second lens group Ghaving positive refracting power. For zooming from the wide-angle end to the telephoto end, the second lens group Gmoves only toward the object side. The electronic image pickup system also comprises an electronic image pickup device I located on the image side of the zoom optical system.

An immersion type microscope objective is configured by, in order from the object side to an image side, a positive lens group Ga including a cemented lens obtained by cementing a plano-convex lens whose plane surface faces the object side to a meniscus lens whose concave surface faces the object side, and a positive single lens, a positive lens group Gb including a cemented lens, a lens group Gc including at least one cemented lens, a lens group Gd having a meniscus lens having a strongly concave surface that faces the image side, and a lens group Ge having a negative lens having a strongly concave surface that faces the object side.

Microscope objective and fluorescent observation apparatus therewith

Immersion type microscope objective

A zoom optical system suited for use in an electronic image pickup apparatus comprising a first negative lens unit, a second positive lens unit and a third positive lens unit, in which a magnification is changed from a wide position to a tele position by moving at least the first lens unit and the second lens unit so as to change an airspace between the first lens unit and the second lens unit and widen an airspace between the second lens unit and the third lens unit, the second lens unit comprises a biconvex lens element and a cemented meniscus lens component having a convex surface on the object side, and each lens unit has a small thickness.

Zoom optical system

The object of the invention is to reduce the thickness of electronic image pickup equipment as much as possible, using a zooming mode having stable, high image-formation capabilities from an object at infinity to a near-by object. The electronic image pickup equipment comprises a zoom lens system comprising a negative, first lens group G , a positive, second lens group G and a positive, third lens group G . For zooming from the wide-angle end to the telephoto end of the zoom lens system upon focused on an object at infinity, the separation between G and G becomes wise. By moving G toward the object side of the system, the system can be focused on a nearer-by object. In the zoom lens system, the second lens group G comprises one positive lens , one negative lens and a lens subgroup comprising at least one lens, and the third lens group G comprises one positive lens. The zoom lens system satisfies conditions with respect to the optical axis distance from the image-side surface of the positive lens to the image-side surface of the negative lens and the focal length ratio in air between the positive lens and the lens subgroup

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Tokyo, Japan

Hirokazu Konishi