Canon Kabushiki Kaisha

Komatsu Corporation

Kabushiki Kaisha Toshiba

Nippon Steel Corporation

Tokyo Shibaura Denki Kabushiki Kaisha

Minolta Camera Kabushiki Kaisha

Kabushiki Kaisha Komatsu Seisakusho

Toyo Boseki Kabushiki Kaisha

Tokyo Shibaura Electric Co., Ltd.

Minolta Camera K.k.

Hiroshi Endo

Kazuyoshi Takahashi

Toshiyuki Yanaka

Nobumi Yoshida

Masaru Hayashi

Hideki Ogawa

Sadatoshi Takahashi

Eiichi Takagi

Shiro Toriumi

Yoshimasa Zama

Takashi Watanabe

Makoto Katsuma

Toshiaki Mabuchi

Yoshikazu Ishikawa

Kazuhiro Maruta

Tsutomu Yamashita

Takeshi Ozasa

Masayuki Yamaguchi

Yosinari Miura

Masahiko Shiraishi

Takesada Sasaki

Naoki Ishizaki

Hiroshi Inoue

Hiroyuki Miyake

Tsutomu Okutomi

Fumio Ueno

Katsutoshi Komeya

Motomasa Imai

Kuniaki Kamimura

Takao Saijo

Mikio Okawa

Seishi Chiba

Tadaaki Sekiguchi

Takanori Saito

Junkichi Abe

Shoji Kozuka

Shigeo Iiri

Naoyuki Hirate

Shoji Koike

Isao Suzuki

Satoshi Yamaguchi

Yasushi Miura

Tsunefumi Tanaka

Koji Yamakawa

Takashi Takahashi

Noriaki Yagi

Katsumi Hisano

Iwao Mitsuishi

Yasuyuki Takanaka

Takaaki Yasumoto

Masatoshi Ikkatai

Akihiko Tsuge

Shigeru Matake

Akihiro Horiguchi

Tadao Karakama

Takashi Sano

Sadao Nunotani

Osamu Furukawa

Jun Maruyama

Mitsuo Kasori

Hideo Iwasaki

Nobuo Iwase

Hideyuki Kanai

Kaoru Koiwa

Tomiya Sasaki

Mitsuru Arai

Nobuo Kadowaki

Toshihiko Oguchi

Kiyoshi Iyogi

Takeshi Yatsuka

Yutaka Mizumura

Yoshiko Miyashita

Naoki Shutoh

Toshiro Takano

Koutaro Yano

Seiichi Yamagishi

Takahisa Akaishi

Jun Momma

Kazuo Shinozaki

Nobuo Ueda

Naoyuki Sori

Kazumi Shimotori

Hiromi Shizu

Shuji Hori

Hisashi Matsumoto

Kenji Obu

Katsuyoshi Oh-Ishi

Motoo Seimiya

Toshiya Sakamoto

Masao Tezuka

Hiroshi Hirakouchi

Hideyasu Andoh

Takahiro Miyata

Kei Kawabata

Akio Iino

Yoshinori Fujimori

Masashi Awa

Akinori Nagasugi

Yoshiyuki Unno

Haruo Kudo

A zoom lens includes a first lens unit having a negative refractive power, a second lens unit having a positive refractive power, and a rear unit including one or more lens units, which are arranged in order from the object side to the image side. The zoom lens performs zooming by changing distances between the first, second, and rear lens units. A first focusing unit and a second focusing unit which move independently of each other during focusing are provided. The first and second focusing units are adequately set.

Zoom lens and image pickup apparatus including the same

A photographing optical system includes at least one of a positive lens and diffractive optical element being provided closer to an object side of the system than an intersection P of a light axis and paraxial chief ray, and a negative lens, provided closer to an image side than the intersection. The positive lens and the negative lens are formed of materials satisfying the following conditions when the maximum height of a paraxial marginal ray, passing through a lens surface, from the light axis at a location closer to the object side than the intersection is greater than a maximum height of the paraxial marginal ray, passing through a lens surface, from the light axis at a location closer to the image than the intersection:&#x2212;0.0015 &#xd7;+0.6425 &#x3c;&#x3b8;gF60 &#x3c;&#x3bd;where &#x3bd;d is an Abbe number and &#x3b8;gF is a partial dispersion ratio.

Photographing optical system and image pickup apparatus including the same

At least one exemplary embodiment is directed to an imaging optical system which includes a first lens unit having a positive refractive power and a second lens unit having a negative refractive power. The first lens unit includes a first lens sub-unit including a single lens having a positive refractive power, a second lens sub-unit including a diffractive optical part and having a positive refractive power, and a third lens sub-unit having a negative refractive power. The first to third lens sub-units are disposed in this order from the object side to the image side. The diffractive optical part can be convex towards the object side and the following condition can be satisfied: 0.05&#x3c;L/OTL&#x3c;0.2 where Ldenotes a distance between the first lens sub-unit and the second lens sub-unit and OTL denotes the total optical length.

Imaging optical system and image capturing apparatus including imaging optical system

At least one exemplary embodiment is directed to a zoom lens system having a telephoto-type configuration at the telephoto end. When assuming that an Abbe number is vd, and a partial dispersion ratio is &#x3b8;gF, this zoom lens system includes a refractive optical element having positive refracting power made up of a solid material that can satisfy the following conditions:&#x2212;2.100&#xd7;10+0.693&#x3c;&#x3b8;0.555&#x3c;&#x3b8;&#x3c;0.9 Thus, facilitating the configuration of a zoom lens system capable of appropriately correcting and/or reducing various aberrations, including a chromatic aberration straddling the entire zoom area.

Zoom lens system and image pickup apparatus including the same

An optical system including a diffractive optical element, and an optical member for suppressing incidence of ultraviolet radiation on the diffractive optical element is disclosed. The optical member is disposed on a light incident side of the diffractive optical element. The optical member has optical power to achieve an optical system that has high optical performance and preferable environmental durability.

Optical system, and image pick-up apparatus using the same

Provided is a retrofocus type optical system including a lens or a layer made of a material satisfying the following conditions of the Abbe constant &#x3bd;d and partial dispersion ratios &#x3b8;gd and &#x3b8;gF,&#x3bd;d&#x3c;30,&#x3b8;&#x3c;&#x2212;3.333&#xd7;10+1.40,&#x3b8;&#x3c;&#x2212;2.615&#x2212;10+0.67.In the case that this layer is disposed on the front side of the aperture stop, the layer is designed to have a positive refractive power, and in the case that the layer is disposed on the rear side of the aperture stop, the layer is designed to have a negative refractive index.

Retrofocus type optical system

A radial type piston motor with a speed reducer capable of housing the speed reducer and the motor within width of a track shoe. For this purpose, in the radial type piston motor with a speed reducer: the speed reducer includes planetary gear trains of a plurality of stages; a hollow final shaft is integrally constructed in a motor case of the motor; at least a planetary gear train of one stage of the aforesaid planetary gear trains is placed in a hollow of the final shaft; and at least a final stage planetary gear train of the plurality of planetary gear trains is placed outside the final shaft.

Radial type piston motor with speed reducer

When an magnified and synthesized image is finally printed on a printing medium based on an original image and a character font data, linear magnifying processing is executed with the aid of a software on the host computer side for the original image optically read by a scanner. In addition, vector magnifying processing is executed for font data likewise with the aid of a software, and moreover, synthesizing processing is executed for the font data. At this time, forming processing such as edge emphasizing or the like can be executed after completion of the vector magnifying processing. Synthesizing data are additionally magnified in a printer with the aid of a hardware, and subsequently, the magnified and synthesized image is outputted to the printer for performing a printing operation by the latter. An magnifying rate applicable to the host computer and the printer can be determined such that productivity of the image forming system is maximized.

Image forming system

This invention allows both a plateless textile printer that makes process color expression, and a plate textile printer to achieve equivalent color expressions. For this purpose, image data that uses an RGB pallet is converted into YMCK image data using a correction table. An ink-jet textile printer ( ) prints on textile on the basis of the converted image data. On the other hand, the image data that uses the RGB pallet is sent to a plate separation data generation unit ( ), and is separated into binary plate data, the number of which is the same as the number of ink colors of the ink-jet textile printer, using an RGB/ink color tone correction table to realize the same color expression as that of screen textile printing. In this case, a plate data file name to be generated, the resolution of a plate to be output, the number of repetitions of an original design of plate data to be output in the horizontal direction, and the number of repetitions of the original design of the plate data to be output in the vertical direction are respectively input to boxes ( ) on a dialog. Also, an input conversion file, an output conversion file, a tone curve file used by retouch software, an original image resolution, an enlargement/reduction method, an ink table file, an output data type, and a repetition method are respectively selected using pull-down menus ( ) of the dialog. Using these parameters, a film plotter ( ) prints images in units of plates (colors) on lith films, and the printed lith films are set in an exposure machine ( ) to undergo exposure, thus obtaining all plates. Using the obtained plates, a screen textile printer ( ) prints on textile using the same inks as those of the ink-jet textile printer.

Textile printing system, and plate separation apparatus and method

A negative-lead type zoom lens has a diffractive optical element and is led by a lens unit having a negative optical power. In this zoom lens, various kinds of aberration including chromatic aberration are excellently corrected by properly setting the lens configuration of each lens unit so as to achieve high optical performance over the entire range of a variable power while the entire lens system is miniaturized and designed to have a wide angle. The zoom lens according to the present invention is suitable for a zoom lens with a wide angle including a wide-angle region that is a focal length of substantially 28 mm on a 35 mm single lens reflex camera basis.

Zoom lens and optical instrument using the same

There are provided A zoom lens system comprising, in order from an object side, a first lens unit of negative refractive power, a second lens unit of positive refractive power, a third lens unit of negative refractive power, and a fourth lens unit of positive refractive power, wherein the zoom lens system zooming from a wide angle end to a telephoto end a separation between each lens units is varied so that conditional expressions D W>D T, D W>D T, and D W>D T are satisfied where DiW is a separation between an i-th lens unit and an (i&plus;1)-th lens unit at a wide-angle end, DiT is a separation between an i-th lens unit and an (i&plus;1)-th lens unit at a telephoto end, wherein a diffraction optical element is included in at least one of lens units.

Zoom lens system and optical apparatus using the same

Variable magnification optical system and optical apparatus having image stabilizing function

An image forming apparatus wherein an image for a predetermined region of a recording material is formed using images having a complementary relation by a plurality of scans of a recording head, the apparatus including allocating means for allocating a multi-level image data for the predetermined region for the scans; gradation reducing means for reducing gradation of the multi-level image data allocated by the allocating means, respectively; image forming means for forming an image having the complementary relation by driving the recording head in the scans on the basis of the image data having gradations reduced by the reducing means; wherein the complementary relation of the image by the forming means is reduced by at least one of the allocating means and the gradation reducing means.

Complementary recording system using multi-scan

Energy of returning pressurized fluid of an actuator is recovered and reused as energy for operating other accumulators. A first pump motor ( ) and a second pump motor ( ) are mechanically connected to form a pressure converter ( ), and a first circuit ( ), to which the returning pressurized fluid is supplied, is connected to the first pump motor ( ). A pressure accumulator ( ) is provided to a second circuit ( ) connected to the second pump motor ( ). The first circuit ( ) is connected to a discharge passage ( ) of a primary hydraulic pump ( ) by a third circuit ( ) and the pressure of a high pressure pressurized fluid is supplied to the discharge passage ( ) by the pressure of the high pressure pressurized fluid, and is reused.

Pressurized fluid recovery/reutilization system

Growing community of inventors

Sagamihara, Japan

Hiroshi Endo