Olympus Corporation

Olympus Optical Company, Ltd.

Tdk Corporation

Olympus Medical Systems Corporation

Hiroshi Tsuyuki

Mitsujiro Konno

Takeshi Suga

Akira Kikuchi

Toshihiro Suzuki

Akira Hasegawa

Masami Shimizu

Masao Sambongi

Daisuke Akiyama

Akikazu Yachi

Kentaro Sawamura

Osamu Hirose

Toshikazu Takayama

Tetsuo Akoh

Yasuyoshi Suzuki

Keiji Murata

An optical system includes in order from an object side, an objective optical system, a λ/4 wavelength plate including one birefringent material, a polarizing beam splitter which splits light from the objective optical system into two, and an image sensor which picks up two images split. The polarizing beam splitter causes to occur an axial astigmatism of an opposite sign with respect to an axial astigmatism occurred due to the λ/4 wavelength plate, the following conditional expression (1) is satisfied.1.1≤/(|)≤49  (1)

Optical system, endoscope apparatus and endoscope

An endoscope includes in order from an object side, an objective optical system, an optical-path splitter, an image sensor, and an image processor. A &#x3bb;/4 wavelength plate is disposed between the objective optical system and the splitter. The splitter includes first and second prisms, and has a beam splitting surface at which the first prism and the second prism are brought into close contact. The splitter splits light at the beam splitting surface, into a first optical path through which P-polarized light is transmitted and a second optical path through which S-polarized light is reflected. The first and second prisms are slid relative to one another along the beam splitting surface to adjust optical path lengths of the first and second optical paths, and are disposed at positions to cancel an amount of shift in focusing positions of extraordinary and ordinary light, and satisfy specific conditional expressions.

Endoscope, method for adjustment of endoscope, and image pickup apparatus

An endoscope includes in order from an object side to an image side, an objective optical system, an optical-path splitter which splits light from the objective optical system into two, and an image sensor which picks up two split images. A multi-order &#x3bb;/4 wavelength plate made of a birefringent material is disposed in an optical path between the objective optical system and the optical-path splitter, and

Endoscope and image pickup apparatus

An objective optical system includes a lens group and an optical path splitting element. The optical path splitting element is disposed on an optical path of the lens group, the optical path splitting element includes an optical path splitting surface configured to form a first optical path and a second optical path, an optical path length in the first optical path is different from an optical path length in the second optical path, a sum total of the number of transmissions of light and the number of reflections of light in the second optical path is larger than a sum total of the number of transmissions of light and the number of reflections of light in the first optical path, and an optical surface satisfying following conditional expression (1) is disposed on the first optical path,0.8&#x2264;650/550&#x2264;0.9&#x2003;&#x2003;(1).

Objective optical system and endoscope device including the same

An endoscope system includes: a generating means generating a compositing mask that serves as compositing ratios of the corresponding pixels between a pair of images acquired by simultaneously imaging two optical images having different focus positions, into which a subject image is divided on the basis of the ratios of contrasts; a correcting means subjecting compositing masks generated for pairs of images acquired in time series, to weighted averaging for respective pixels, thus generating a corrected mask; and an compositing means compositing the two images according to the corrected mask. The correcting means subjects the compositing masks to weighted averaging by performing weighting such that the percentage of the past compositing masks is higher at pixels constituting a static area and an area having contrast lower than a threshold than at pixels constituting a moving-object area or an area having contrast equal to or higher than the threshold.

Endoscope system

An image with an expanded depth of field is more effectively acquired while reducing the manufacturing cost, without enlarging the apparatus. Provided is an endoscope system including: an objective optical system that is provided at an insertion portion tip and that acquires a subject image; an optical path division means for dividing the subject image into two optical images with different focuses; an imaging element that forms the two optical images with different focuses at the same time to acquire two images; an image correction means that corrects the two images acquired by the imaging element so that differences other than the focuses become substantially the same; and an image combination processing unit that selects an image with a relatively high contrast in predetermined corresponding areas between the two images corrected by the image correction means to generate a combined image.

An endoscope includes an objective optical system at a distal end of an inserted portion to acquire a subject image; a part that splits the subject image into two optical images focused differently; an imaging device that acquires two images by simultaneously capturing the optical images arranged on an imaging surface; and a part for cutting out at least abutting portions of the optical images on the imaging device, wherein A+B&#x3e;C+D, where A is half the maximum length of light-receiving regions for the optical images at the imaging surface; where TW is an entry angle at the imaging surface when A is at the maximum image height and d is an optical-path-length difference between the optical images, B=d&#xd7;tan TW; C is half the length of the light-receiving regions in a direction of the optical images arranged on the imaging surface; and D is a distance between the two light-receiving regions.

Endoscope

An endoscope system includes an endoscope objective optical system that acquires two optical images with different focus positions, an image pickup device that picks up the two optical images to acquire two image signals, an image synthesis processing section that makes a comparison in contrast between the two image signals for each spatially identical pixel region and selects a pixel region having relatively higher contrast to thereby synthesize the two image signals into one image, and a focus switchover mechanism that moves a position of a focus switchover lens provided for the endoscope objective optical system and selectively switches a focus of the endoscope objective optical system to one of two observation regions of proximity observation and remote observation, in which the image synthesis processing section synthesizes two images in each of the respective observation regions of the proximity observation and the remote observation.

The invention provides lenses at low cost, which form an illumination optical system for endoscopes that has high efficiency and achieves improved light distribution. The illumination optical system for endoscopes is used in opposition to a light beam exit endof a transmission means F for light emitted from a light source, and comprises, as viewed from the light beam exit end, a lens grouphaving positive power and an optical membersubsequent thereto which has a spherical surfacethat functions as a lens, has a radius of curvature R, and satisfies the following condition:1.48&#x2266;&#x2266;4&#x2003;&#x2003;(1)where

Illumination optical system for endoscopes

An image pickup apparatus comprising an optical element which absorbs rays having specific wavelengths, an optical element which reflects rays having specific wavelengths and an organic color mosaic filter, wherein a total spectral characteristic of the optical elements satisfies the following condition:0.45&#x2266;|&#x394;|&#x2266;0.75.

Image pickup apparatus

The present invention provides a conductive pattern that has low electric resistivity, is superior in adhesion to a substrate and does not cause substrate cracking during plating, a multilayered substrate incorporating such a conductive pattern, and a fabricating method for a multilayered substrate. At first, a conductive composition including a metal powder containing not less than 95 mass % of Ag, a sintering restrainer containing Cr and/or Cr compound, a dielectric loss conditioner containing Mn and/or Mn compound, and a vehicle is prepared. Next, electrodes made of the conductive composition are formed on a plurality of green sheets. The plurality of green sheets formed with the electrodes are then laminated to form a laminated product, whereafter the laminated product is sintered.

Conductive pattern incorporated in a multilayered substrate, multilayered substrate incorporating a conductive pattern, and a method of fabricating a multilayered substrate

An illumination system for endoscopes has a light guide bundle constructed and arranged to illuminate an object to be observed. The light guide bundle is extended in an axial direction of the endoscope and branched into a plurality of branch portions in a frame which is adapted to be disposed inside of the endoscope. Each of the branch portions have a crescent-shaped cross-section at a mid-portion along the axial direction of the endoscope and each of the branch portions have at least one bent portion in which a protective glass plate is disposed on each exit surface of the branch portions. An endoscope system includes the above illumination system.

Illumination system for endoscopes and an endoscope having the illumination system

An imaging apparatus for endoscopes includes an endoscope; a TV camera head incorporating, at least, a solid-state image sensor; and a TV photographic adapter incorporating at least one part of an optical system for forming an image obtained by the endoscope on the solid-state image sensor. At least one of the TV camera head and the TV photographic adapter is hermetically sealed by dampproof members so that autoclaving treatment can be received.

Imaging apparatus for endoscopes

A glass composition for a substrate with a built-in lead-dielectric material, containing up to 35 mol % calculated as Al.sub.2 O.sub.3 of aluminum oxide, 20 to 60 mol % calculated as CaO of calcium oxide, and 8 to 40 mol % calculated as SiO.sub.2 of silicon oxide.

Glass composition for substrates with a built-in lead base dielectric

An objective optical system for endoscopes to be disposed in a tip of an endoscope in an axial direction thereof and in parallel with a bundle of illumination system, and comprising an optical system which is to be disposed in the tip of the endoscope and has a diameter smaller than that of another optical system to be disposed on the image side thereof.

Growing community of inventors

Tokyo, Japan

Hiroshi Tsuyuki