Olympus Imaging Corporation

Olympus Corporation

Olympus Medical Systems Corporation

Olympus Corporation and Olympus Imaging Corp.

Masahiro Katakura

Takeshi Suga

Eiji Shirota

Hideyuki Nagaoka

Takashi Saito

Kazuteru Kawamura

Hideyasu Takato

Masaru Morooka

Yuji Kamo

Tsutomu Uzawa

Kazuhiro Gono

Kenji Kamimura

Ryosuke Ito

Kensuke Miyake

Ryu Oshima

Yugo Koizumi

Yoshimine Kobayashi

Mai Ojima

An endoscope optical system includes, in order from an object side: a fixed negative first lens group; a movable positive second lens group; a fixed aperture stop; and a fixed positive third lens group, the endoscope optical system being capable of switching between a normal observation state and a magnified observation state by moving the second lens group along an optical axis, in which the third lens group includes, in order from the object side: a cemented lens consisted of three lenses; and a cemented lens consisted of two lenses. In the cemented lens consisted of three lenses, three lenses of a positive lens, a negative lens, and a positive lens are cemented. In the cemented lens consisted of two lenses, two lenses of a positive lens and a negative lens are cemented. The following conditional expressions (1) and (2) are satisfied: 1.70&#x3c;(nd3G1+nd3G2+nd3G3)/3&#x3c;2.0 (1); and 1.72&#x3c;(nd3G4+nd3G5)/2&#x3c;2.0 (2).

Endoscope optical system, endoscope, image pickup unit and endoscope insertion device

An endoscope includes a plurality of illuminating optical systems, an objective optical system, and an optical-path splitting member. The optical-path splitting member has an optical element which forms a first optical path and a second optical path, and an optical-path length of the first optical path differs from an optical-path length of the second optical path. Illumination light is irradiated to an object from the plurality of illuminating optical systems. The objective optical system has an object-side incidence surface which is located nearest to the object, and each of the plurality of illuminating optical systems has an object-side emergence surface which is located nearest to the object. Each of the object-side emergence surfaces is located on an image side of the object-side incidence surface, and following conditional expression (1) is satisfied:2.0&#x3c;min/OPLdiff&#x3c;50&#x2003;&#x2003;(1).

Endoscope

An endoscope apparatus including a connector included in an endoscope and connected to an endoscope connection portion of a video processor, a fluid feeding apparatus including a tube configured to transmit fluid to the endoscope, a connection detector configured to detect a connection state of the tube with the connector of the endoscope, a control unit configured to detect an ON/OFF state of a power source of the fluid feeding apparatus, determine an abnormality exists when the connection detector detects that the tube is in a disconnected state with the connector of the endoscope and the power source of the fluid feeding apparatus is detected to be in an ON state, and output a notification of the determined abnormality, and a display configured to display the notification of the abnormality outputted by the control unit.

Endoscope apparatus, activation method, and video processor for determining an abnormality

The endoscope optical system includes in order from an object side, a first lens group having a negative refractive power, a second lens group having a positive refractive power, and a third lens group having a positive refractive power. Switching between a normal observation and a magnified observation is possible by fixing the first lens group and the third lens group, and moving the second lens group. The third lens group includes a cemented lens. The cemented lens includes an object-side lens and an image-side lens, and the following conditional expressions (1) and (2) are satisfied:0.471&#x3c;02&#x2212;01&#x3c;0.475&#x2003;&#x2003;(1)52.6&#x3c;01&#x2212;02&#x3c;53&#x2003;&#x2003;(2).

Endoscope optical system

This endoscope objective optical system is capable of acquiring images of high resolution and wide angle of observation field, maintaining low invasiveness and appropriately correcting various aberrations. This optical system has at least a first cemented lens which has a positive lens and a negative lens, in which the cemented lens satisfies the following conditional expressions: (1) 15.0&#x3c;&#x3bd;A&#x2212;ndA&#x3c;15.75 and (2) &#x2212;0.2&#x3e;rdyA1/ih&#x3e;&#x2212;20, wherein &#x3bd;A is an Abbe number of the negative lens, ndA is a refractive index of the negative lens at the d-line, rdyA1 is a curvature radius of a joining surface of the negative lens, and ih is an image height.

Endoscope objective optical system

An endoscope system includes an objective optical system OBL, an optical path splitting unit which splits an object image acquired by the objective optical system OBL into two optical images having a different focus, an image pickup element which acquires the optical images, and an image synthesis processing section which selects in a predetermined area an image with a relatively high contrast from the two optical images acquired, and generates a composite image, wherein the objective optical system OBL includes a first lens Lhaving a negative refractive power which is nearest to object, and the endoscope system satisfies the following conditional expressions (1) and (2).3&#x3c;_diff/_pitch&#x2264;100&#x2003;&#x2003;(1)0.005&#x3c;_diff/1_&#x3c;1.0&#x2003;&#x2003;(2)

Endoscope system for generating a composite image from optical images of different focus

This endoscope has an observation optical system that switches its observation mode between magnified observation and normal observation by moving some lenses in an optical-axis direction; and a plurality of illumination optical systems, wherein lens surfaces at the most distal ends of the plurality of illumination optical systems are disposed closer to a proximal end than a lens surface at the most distal end of the observation optical system, and all of the lens surfaces at the most distal ends of the plurality of illumination optical systems are disposed substantially parallel to the lens surface at the most distal end of the observation optical system, wherein the following conditional expressions (1) to (3) are satisfied.1.0&#x2266;_Back(far)/_Back(near)&#x3c;3.0&#x2003;&#x2003;(1)0.015&#x3c;_Back(far)/_far&#x3c;1.0&#x2003;&#x2003;(2)1.01&#x3c;&#x3c9;(wide)/&#x3c9;(tele)&#x3c;5.0&#x2003;&#x2003;(3)

Endoscope with plurality of illumination optical systems

An optical measuring device includes: a light source unit; a measurement probe including a fiber bundle, an illumination fiber that illuminates a living tissue with a illumination light, and a plurality of light-receiving fibers that receives return light of the illumination light reflected and/or scattered at the living tissue; a detection unit that receives the return light of the illumination light detected by the plurality of respective light-receiving fibers, and performs photoelectric conversion to detect respective signal intensities; and an association unit that associates the respective signal intensities detected by the detection unit with distances from the illumination fiber to the respective light-receiving fibers on an end face of a distal end portion of the measurement probe, when light having an intensity gradient around the illumination fiber is projected to the end face of the distal end portion of the measurement probe.

Optical measuring device and fiber bundle association method

This endoscope includes an observation optical system capable of changing a magnified observation and a normal observation with each other, and a plurality of illumination optical systems, wherein a most tip side lens surface of at least one of the illumination optical systems is disposed at a position which is closer to a proximal end side than a most tip side lens surface of the observation optical system, and the following conditional expressions are satisfied.0.03&#x3c;_Back(max)/&#x3c;2&#x2003;&#x2003;(1)1.05&#x3c;&#x3c;5&#x2003;&#x2003;(2) In the expression, D_Back(max) is a maximum value of a distance between the most tip side lens surface and the most tip side lens surface, ft is a focal length in a close-distance magnified observation state, and fw is a focal length in a normal observation state.

To off-axis and on-axis aberrations at low cost while having a wide angle of view, an endoscope objective optical system () has in order: a negative first lens (L); a negative second lens (L) and a third lens (L) joined to each other; a brightness diaphragm (S); and a positive lens group (G) having a cemented lens (CL) including one positive lens and one negative lens joined to each other, and satisfies expressions (1) and (2):1.0&#x3c;3(96 deg)/_all&#x3c;10&#x2003;&#x2003;(1)1.1&#x3c;(1+2)/(1&#x2212;2)&#x3c;5.0&#x2003;&#x2003;(2)

To allow placement of optical members by providing a long back focus, make aberrations less subject to manufacturing errors, and reduce variations in aberrations during focusing. An endoscopic objective optical system includes, in order from an object side, a front group with negative refractive power, a focusing lens, and a rear group with positive refractive power, wherein: the endoscopic objective optical system satisfies conditional expressions (1) to (4) below:4&#x3c;/FL&#x2003;&#x2003;(1)FL/||&#x3c;0.1&#x2003;&#x2003;(2)&#x2212;3&#x3c;_/FL&#x3c;&#x2212;0.9&#x2003;&#x2003;(3)2.5&#x3c;_/FL&#x3c;5&#x2003;&#x2003;(4)

Endoscopic objective optical system and imaging apparatus

An endoscope optical system has a first lens group having positive refractive power, an aperture diaphragm, a second lens group having negative refractive power and a third lens group having positive refractive group, the second lens group moving along an optical axis to perform focusing, the first lens group having a first lens having negative refractive power and a second lens having positive refractive power, and the optical system satisfying the following conditional equation:&#x2212;5.0&#x3c;(76)*(1&#x2212;01)/2&#x3c;&#x2212;0.2&#x2003;&#x2003;(1)0.5&#x3c;(1+2)/(1&#x2212;2)&#x3c;1.2&#x2003;&#x2003;(2)

A fiber unit has an illumination fiber and detection fibers. The illumination fiber and the detection fiber comprise a soft portion that is bendable, a distal end hard portion provided at an end thereof and having a greater hardness than the soft portion, and a pitch conversion portion that connects the soft portion and the distal end hard portion and changes a distance between adjacent fibers at the distal end hard portion with respect to a distance between the adjacent fibers at the soft portion, by bending and extending. 1.0 degree&#x3c;Deg_max&#x3c;6.0 degrees, where Deg_max is a most inclined angle of angles each formed by a central axis of the distal end hard portion and a line segment connecting an end portion of the pitch conversion portion closer to the soft portion and an end portion of the pitch conversion portion closer the distal end hard portion.

Fiber unit

An endoscope optical system includes a negative lens that focuses light entering along an incident optical axis, a first prism that deflects and emits the light from the negative lens along a first axis substantially orthogonal to the incident optical axis, a second prism having a first reflecting surface, which deflects the light from the first prism along a second axis substantially orthogonal to the first axis, and a second reflecting surface that deflects and emits the light substantially parallel to the first axis and that faces the first prism, a third prism that deflects the light from the second prism substantially parallel to the incident optical axis, and a positive lens that focuses the light from the second prism, in this order from an object side, the negative lens and the first prism being rotatable about the first axis relative to the second prism.

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Chofu, Japan

Masahiro Katakura