Olympus Corporation

Mitsubishi Denki Kabushiki Kaisha

Olympus Optical Company, Ltd.

Renesas Technology Corp.

Mitsubishi Electric Engineering Company, Limited

Olympus Optical

Kazuya Yamanaka

Hiroyoshi Kobayashi

Shuji Murakami

Yoshihiro Maeda

Hisashi Goto

Shiro Hosotani

Kazuaki Murayama

Minobu Yazawa

Susumu Kobayashi

Kengo Enomoto

Nobuhiro Miyoshi

Masakatsu Ohuchi

Isao Doshida

Masatoshi Kimura

Takashi Fujiwara

Kensuke Ishii

Seiichiro Tabata

Jun Ido

Kazunari Hanano

Sumitaka Takeuchi

Motohiro Atsumi

Hiroyuki Mizutani

Syuji Murakami

Yukinaga Imamura

An endoscopic treatment tool includes a port, a sheath having a proximal region inserted into the port and a distal region continuing to the proximal region to extend to the outside of the port, a flap having a distal end in the distal region and a proximal end in the proximal region and extending in a longitudinal axis direction of the sheath from a distal end to a proximal end of the sheath, a notch surface formed in the sheath between the proximal end of the flap and the proximal end of the sheath to form a notch shape in the flap along the longitudinal axis, and a rotation preventing portion disposed between the notch surface and the internal surface of the port, wherein the rotation preventing portion has an inclined surface inclined from the opening toward the lumen and an engaging surface capable of engaging with the notch surface.

Endoscopic treatment tool

An apparatus has a synchronizing signal generator to which a trigger signal is input and that outputs a first synchronizing signal and a second synchronizing signal based on the trigger signal, an image pickup unit that has an image pickup surface, performs a first image picking-up based on the first synchronizing signal, and performs a second image picking-up based on the second synchronizing signal, and an image pickup element tilting unit that changes the angle of the image pickup surface relative to the optical axis during a period after the first image picking-up and before the second image picking-up.

Image pickup apparatus

A first calculating section calculates an amount of camera-shake correction based on an amount of shaking of the image pickup apparatus which has been detected, when each of a first capturing and a second capturing is carried out. A second calculating section calculates at least an amount of optical tilt-displacement between the image pickup element and an object for the first capturing, which is necessary for the second capturing, and the second calculating section calculates one of an amount of shift by which some of the image pickup lenses and the interchangeable image pickup lenses are to be shifted in a predetermined direction, and an amount of change by which an angle of an image pickup surface of the image pickup element with respect to the optical axial direction is to be changed, while the first capturing and the second capturing are being carried out.

The present invention provides a polarization switching liquid crystal elementhaving TN liquid crystalretained between two transparent substratesandfor transmitting at least visible polarized light with the polarized light transmission axis selectively rotated by 90 degrees when a voltage is selectively applied to the TN liquid crystal, wherein a phase difference u of said TN liquid crystalis defined by the following equation: u=2&#xd7;&#x394;n&#xd7;d/&#x3bb;, where &#x394;n is the refractive index anisotropy of said TN liquid crystal, d is the thickness of said TN liquid crystal, and &#x3bb; is the wavelength of said polarized light, and a transmittance T of said polarization switching liquid crystal element measured with polarization plates on the incident and outgoing sides is defined by the following equation: T=(&#xbd;)&#xd7;sin{&#x3c0;(1+u)/2}/(1+u), and wherein the phase difference u includes a value 1.7 and the transmittance T is 0.1 or lower when the &#x3bb; ranges from 400 nm to 700 nm. Then, a polarization switching liquid crystal element having a high response speed and reduced wavelength-dependency can be realized using inexpensive and highly durable TN liquid crystal without increasing parts cost.

Polarization switching liquid crystal element and image display apparatus having the same

A sensor unit for measuring a response characteristic of a polarization rotation liquid crystal cell, includes a measurement light source which emits measurement light, a first polarization plate which has a first polarization direction and receives the measurement light from the measurement light source to output measurement light having the first polarization direction to a polarization rotation liquid crystal cell, a second polarization plate which has a second polarization direction and receives measurement light passed through the polarization rotation liquid crystal cell, a light receiving unit which receives measurement light passed through the second polarization plate, and a measurement unit which determines a response characteristic of the polarization rotation liquid crystal cell on the basis of a drive signal of the polarization rotation liquid crystal cell and the amount of measurement light received by the light receiving unit.

Sensor unit and image display apparatus

A field sequential lighting device for emitting light corresponding to a plurality of colors using a field sequential method includes: a light source; and a light converting section for intensifying the emitted light by sequentially converting the light, emitted from the light source, corresponding to the plurality of colors. By doing this, it is possible to provide a field sequential lighting device using the light emitted from the light source efficiently and having desirable color reproducibility, and an image projecting device having it.

Field sequential lighting device and image projecting device

A light modulating unit includes first and second light modulating sections each of which modulates an illumination light on the basis of a video signal to generate a projection light that is a linearly polarized light, a light path synthesizing section which synthesizes the projection lights generated by the first and second light modulating sections using the nature that directions of polarizations of the projection lights cross at right angles, and a beam shifting section which sets beams of the projection lights synthesized by the light path synthesizing section, in a shifted state or a non-shifted state on the basis of the directions of polarizations of the projection lights, the beam shifting section switching the shifted state and the non-shifted state synchronously with modulation timings for the first and second light modulating sections.

Light modulating unit and image projection apparatus

In an automatic gain control circuit of a demodulating circuit, power values of pieces of symbol information I and Q of in-phase components and quadrature components of a modulated signal are calculated, a power difference between each power value and an ideal power value is detected, and an AGC control signal is produced to adjust a gain of the modulated signal according to the AGC control signal in a demodulating system including the demodulating circuit. Therefore, when an amount of noise included in the modulated signal is low, an average value of the power differences is reduced to zero, and the modulated signal can be correctly demodulated to a demodulated signal. To correctly demodulate the modulated signal including a large amount of noise, after the conversion of the AGC control signal, a sweep counter value is added to the AGC control signal so as to minimize a bit error rate of the demodulated signal. Thereafter, the ideal power value is corrected to reduce the average value of the power differences to zero even though the AGC control signal is corrected.

Automatic gain control circuit and automatic gain control method

An illumination apparatus which illuminates a portion to be illuminated with light from a light source has a plurality of light emitting members constituting the light source, a driving circuit which drives the respective light emitting members, a condenser optical system which condenses an emitted light from the light emitting member drove by the driving circuit onto the portion to be illuminated, a light control member which performs change of a light path of the light from the light emitting member to illuminate the portion to be illuminated and/or movement of the light emitting member, a movable section which operates the light control member in a predetermined period, and a light selection control section which controls the movable section and/or driving circuit so as to select the light to illuminate the portion to be illuminated from the lights of the plurality of light emitting members.

Illumination apparatus and image projection apparatus using the illumination apparatus

An A-rail circuit outputs a control signal AGCOUTA whereas a B-rail circuit outputs a control signal AGCOUTB in an AGC circuit. AGCOUTA controls an AGC amplifier (A) while AGCOUTB controls an AGC amplifier (B). A difference value between a power of an input signal and (an amount of variable adjustment SWEEP+a power reference value AGCR). If an output signal of a loop filter in the A-rail circuit attains AGCARAIL&#x3e;AGCATOB, AGCARAIL=AGCATOB is fixed, and AGCBRAIL is adjusted based on the difference value. If an output signal of a loop filter in the B-rail circuit attains AGCBRAIL&#x3c;AGCBTOA, AGCBRAIL=AGCBTOA is fixed, and AGCARAIL is adjusted based on the difference value. A control circuit in the AGC circuit acquires a bit error rate, identifies a value of SWEEP allowing a minimum bit error rate, and fixes the value of SWEEP at the identified value.

Automatic gain control circuit controlling gain of receiver including two automatic gain control amplifiers

An illumination apparatus which illuminates a portion to be illuminated with light from a light source comprises a plurality of light emitting members constituting the light source, a driving circuit which drives the respective light emitting members, a condenser optical system which condenses an emitted light from the light emitting member drove by the driving circuit onto the portion to be illuminated, a light control member which performs change of a light path of the light from the light emitting member to illuminate the portion to be illuminated and/or movement of the light emitting member, a movable section which operates the light control member in a predetermined period, and a light selection control section which controls the movable section and/or driving circuit so as to select the light to illuminate the portion to be illuminated from the lights of the plurality of light emitting members.

An optical sheet to be used as a screen on which an image is projected from an image projector is provided. The optical sheet is produced by joining a plurality of optical sheet members with end surfaces thereof meeting each other as joint surfaces. The optical sheet members are realized with lenticular lens sheets. Each lenticular lens sheet has lenses, which are elongated in a second direction, juxtaposed in a first direction orthogonal to the second direction. The optical properties of the optical sheet members that are slightly undulated vary cyclically in the first direction. And the optical sheet members to be joined are a selected pair of optical sheet members whose undulations are substantially identical to each other or symmetrical to each other with respect to the joint surfaces.

Optical sheet, optical sheet manufacturing system, and optical sheet cutting machine

An automatic gain control circuit includes a power calculator for calculating power of a modulation wave supplied to a demodulator; a power comparator for comparing the power calculated by the power calculator with ideal power of a modulation scheme of the modulation signal; a first gain controller for carrying out gain control of a first AGC amplifier in response to an output of the power comparator; and a second gain controller for carrying out gain control of the second AGC amplifier in response to the output of the power comparator. The automatic gain control circuit can solve a problem of a conventional AGC circuit in that precision gain distribution cannot be achieved to the two AGC amplifiers because the two AGC amplifiers are controlled by a single control signal output from the automatic gain control circuit.

Automatic gain control circuit for controlling two AGC amplifiers

An image forming system is provided which includes an optical sheet and an image projector. The optical sheet is constructed by joining a plurality of sheet members with adjoining sheet members meeting to form a joint line. The image projector produces an image and projects the image to the optical sheet through a projection optical system. The relative positional relationship between the image projector and optical sheet is such that the optical axis of the projection optical system included in the image projector perpendicularly intersects the joint line in the optical sheet. Thus, reflection or scattering of light at the joint line is minimized.

Image forming system and optical screen unit

An optical prism ( ) for reflecting incident light from an incidence surface ( ) suited for incidence of light from an LCD ( ) or the like for at least twice before emitting the reflected light as emission light from a predetermined emission surface ( ). The optical prism has side surfaces ( L and R) crossing the incidence and emission surfaces ( and ) and including receded surfaces L and R) formed such as not to impede an optical path of an effective size, the incident light being led along the optical path from the incidence surface to the emission surface.

Growing community of inventors

Hachioji, Japan

Kazuya Yamanaka