Olympus Optical Company, Ltd.

Olympus Corporation

Olympus Medical Systems Corporation

Shuetsutechnica Co., Ltd.

Tsutomu Igarashi

Akira Hasegawa

Kimihiko Nishioka

Atsushi Miyazaki

Koji Takamura

Masahiro Chiba

Noriyuki Tateyama

Akari Kanazawa

Osamu Nonaka

Shinichi Nakamura

Susumu Takahashi

Taichiro Kouchi

Yoji Osanai

Susumu Takhashi

There is provided an objective optical system that is easy to produce, capable of forming optical images that can be observed without difficulties while small in size. The objective optical system includes, in order from the object side, a flat plate OP, an aperture stop S, and a substantially hemispherical planoconvex lens Lhaving an outer diameter substantially equal to the outer diameter of the flat plate. The flat plate and the planoconvex lens Lare cemented together with the aperture stop between. The objective optical system satisfies the following conditional expressions (1), (2), and (3):0.3<<0.45  (1)1.7<1+/(2×)<2.1  (2)0.9</(1+/(2×))<1.1  (3).

Objective optical system, image pickup apparatus, and endoscope

The endoscope illuminating optical system includes a transparent resin member, and a lighting member which outputs illumination light. The transparent resin member has a through hole in which an image sensor is disposed, a non-through hole in which the lighting member is disposed, an internal optical surface which is formed at an interior of the transparent resin member by the non-through hole, and an outer surface from which the illumination light incident on the transparent resin member via the internal optical surface, is emerged toward an object. The outer surface has a curved-surface area through which the illumination light passes, and the curved-surface area has a boundary with the through hole. In the curved-surface area, a displacement of each point of the curved-surface area from the boundary occurs in a direction away from the object.

Endoscope illuminating optical system

An image pickup optical system includes an image pickup field of view in which part of an endoscope is reflected, an aperture stop and a peripheral light reduction stop. The peripheral light reduction stop is positioned in an optical axis direction satisfying Conditional Expression (1), in the peripheral light reduction stop, when a side on which part of the endoscope exists in the image pickup field of view is a first direction and a side on which no part of the endoscope exists in the image pickup field of view is a second direction, an opening portion of the peripheral light reduction stop satisfies Conditional Expression (2), and a peripheral light reduction quantity in the second direction is smaller than a peripheral light reduction quantity in the first direction by shielding no effective luminous flux in the second direction or reducing shielding quantity of the effective luminous flux,0.5|&#x3c;5&#x2003;&#x2003;(1),&#x2212;1.2&#x3c;()|&#x3c;0.6&#x2003;&#x2003;(2).

Image pickup optical system, endoscope, and image pickup apparatus

An objective optical system includes in order from an object side to an image side, a first lens having a negative refractive power, an aperture stop, and a second lens having a positive refractive power. An image-side surface of the first lens is a surface which is concave toward the image side, and an image-side surface of the second lens is a surface which is convex toward the image side, and following conditional expressions (1), (2), (3), (4), (5), (6), and (7) are satisfied:0.6&#x3c;12&#x3c;1.25&#x2003;&#x2003;(1)&#x2212;3&#x3c;(11)&#xd7;(22)&#x3c;&#x2212;1.25&#x2003;&#x2003;(2)&#x2212;2&#x3c;2/(1)&#x3c;&#x2212;1.35&#x2003;&#x2003;(3)2&#x3c;(1&#x2212;1.63)&#xd7;(&#x3bd;1&#x2212;31)&#x2003;&#x2003;(4)5&#x3c;(2&#x2212;1.45)&#xd7;(&#x3bd;2&#x2212;31)&#x2003;&#x2003;(5)1.63&#x3c;1, and, 31&#x3c;&#x3bd;1&#x2003;&#x2003;(6)1.45&#x3c;2, and, 31&#x3c;&#x3bd;2&#x2003;&#x2003;(7).

Objective optical system, endoscope, and endoscope system

A photographing device attachable to a moving body includes: a first control section configured to predict and obtain a change in physical quantity based on an alteration in a photographing state; and a communication control section configured to transmit information related to the change in the physical quantity. The photographing device improves stability in the moving body and stability of photographing. Information related to influence on the moving body based on a change in an outer shape and a change in a position of the center of gravity of the photographing device mounted on the moving body is shared by the moving body to improve the stability in the moving body and the stability of photographing.

Photographing device, moving body for photographing, and photographing control apparatus for moving body

An endoscope illuminating optical system to be disposed at a front end of an insertion portion of an endoscope includes a lens formed by a transparent-resin molding having a function of a front-end frame, which is configured to be disposed at a front-end side of the insertion portion, and a light guide which is disposed adjacent to the lens. A surface of the lens facing the light guide is a composite concave surface in which two axisymmetric concave surfaces are overlapped, and has a gourd-shaped effective cross-section. An effective range of a distal end surface of the light guide has a shape of an ellipsoid, or an oval, or a gourd, and has a long axis in a longitudinal direction of the gourd-shaped effective cross-section of the surface of the lens facing the light guide side, and a short axis in a direction perpendicular to the long axis. The cross-section of the composite concave surface includes an end surface of the light guide.

There is provided an endoscope objective optical system having a thin diameter, a wide in-water angle of view, a small variation in the angle of view, and a short overall length of the optical system. The endoscope objective optical system includes in order from an object side, a front group GF having a negative refractive power, an aperture stop, and a rear group GR having a positive refractive power, wherein the front group includes a first negative lens Land a second negative lens L, and the following conditional expressions (1), (2), (3'), and (4) are satisfied:1&#x3c;&#x3c;1.8&#x2003;&#x2003;(1),4&#x3c;&#x3c;9.5&#x2003;&#x2003;(2),1.49&#x2266;&#x2266;2.30&#x2003;&#x2003;(3&#x2032;), and0.38&#x3c;&#x3a3;&#x3c;0.6&#x2003;&#x2003;(4).

Endoscope objective optical system

An endoscope objective optical system comprises:

Provided is an endoscope objective optical systemincluding, in order from an object side, a first lenscomposed of a negative single lens, a second lenscomposed of a positive single lens, an aperture stop, a third lenscomposed of a positive single lens, and a fourth lenscomposed of a positive combined lens, wherein the third lenshas a meniscus shape having a convex surface facing the image side. The endoscope objective optical system () satisfies the following conditions:0.3&#x3c;&#x3c;1.15,&#x2003;&#x2003;(1)1&#x3c;1.79,&#x2003;&#x2003;(2)2&#x3e;1,&#x2003;&#x2003;(3)0.6&#x3c;&#x3c;0.83,&#x2003;&#x2003;(4) and|1|&#x2212;|2|+1&#x3e;1.8&#x2003;&#x2003;(5)wherein Df is the distance from a surface of the first lens facing the object side to the aperture stop, f is the focal length of the entire system, n1 is the refractive index of the first lens (d-line), n2 is the refractive index of the second lens (d-line), IH is the maximum image height of the entire system, r1 is the radius of curvature of a surface of the third lens facing the object side, r2 is the radius of curvature of the surface of the third lens facing the image side, and d1 is the center thickness of the third lens.

An endoscope objective optical system includes, in order from an object side, a first lens composed of a negative single lens, a second lens composed of a positive single lens, an aperture stop, a third lens composed of a positive single lens, and a fourth lens composed of a positive combined lens, the third lens having a meniscus shape having a convex surface facing the image side. The endoscope objective optical system satisfies the following conditions:0.3&#x3c;&#x3c;1.15,&#x2003;&#x2003;(1)1&#x3c;1.79,&#x2003;&#x2003;(2)2&#x3e;1,&#x2003;&#x2003;(3)0.6&#x3c;&#x3c;0.83,&#x2003;&#x2003;(4)and|1|&#x2212;|2|+1&#x3e;1.8&#x2003;&#x2003;(5)Df is the distance from a surface of the first lens facing the object side to the aperture stop, f is the focal length of the entire system, IH is the maximum image height of the entire system, and d1 is the center thickness of the third lens.

Objective optical system for endoscope

An objective optical system for endoscopes has, in order form the object side, a single lens with negative power, a cemented lens with positive power, and an image sensor unit. The cemented lens has a plano-convex lens, located at the image-side end, with a convex surface facing the image side and an aperture stop placed proximate to a cemented portion and the image sensor unit includes an optically cemented body of at least one optical part, a path bending prism, and a solid-state image sensor to satisfy the following conditions:1.5&#x3c;3.52.4&#x3c;4where f is the focal length of the whole of the objective optical system, Tis the optical path length of the cemented lens, and Tis the optical path length of the image sensor unit.

Objective optical system for endoscopes

An endoscope observation optical system capable of improving the observation resolution of a mucous membrane of a living body is provided. The endoscope includes an observation optical system compatible with both standard visible-light observation and blood-vessel-enhancement observation, whose main component of a displayed image is an absorption peak of hemoglobin present in a waveband lower than 480 nm, wherein some longitudinal chromatic aberration remains in the endoscope observation optical system due to undercorrection at a wavelength of 415 nm, and wherein the focal position during blood-vessel-enhancement observation is set closer to a near point than the focal position during standard visible-light observation.

Endoscope optical system

An objective optical system is disclosed that is suitable for a high-precision endoscope that performs focusing by moving a single lens component. The objective optical system includes, in order from the object side, a front lens group, a middle lens group, and a rear lens group. The middle lens group is composed of two or more lens components, at least two of which have positive refractive power, and the lens component that is moved for focusing is in the middle lens group. Additionally, the objective optical system satisfies two specified conditions, and other conditions may apply.

Objective optical system for an endoscope

An optical system pair for a stereo endoscope is described which enables adjustment of magnification matching in the production phase with low cost and small size for the resulting stereo endoscope products. The stereo optical systempair for stereo endoscope system includes a right optical system and a left optical system, wherein one of the right and left optical systems includes a lens group which has a refractive power, and which is designed to be moveable axially with a moveable range and has a position within the moveable range at which optical magnification equals to &#x2212;1. Also described are optical arrangements of a stereo endoscope incorporating the stereo optical system pair.

Stereo optical system pair for stereo endoscope system

A washable air filter for an internal combustion engine which has high durability and can be washed with ease to reuse it is disclosed. The washable air filter includes an outer cylindrical member; an inner cylindrical member; a first filter elementformed from a stainless mesh sheet which is folded in a pleated-form having peaks and valleys arranged alternately and provided between the outer cylindrical memberand the inner cylindrical member; and a second filter elementprovided between the outer cylindrical memberand the first tilter element. Since the washable air filter uses the filter element made from the stainless mesh sheet, it is possible to effectively remove dust particles from air. Further, the washable air filter can be reused because dust particles are removed off the filter element by washing after use.

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Hachioji, Japan

Tsutomu Igarashi