Olympus Optical Company, Ltd.

Nippon Telegraph and Telephone Public Corporation

Hitachi, Ltd.

Hitachi Medical Corporation

Sumitomo Metal Mining Company, Ltd.

Nippon Telecommunication Engineering Company

Nippon Bell Parts Co., Ltd.

Nihon Telecommunication Engineering Corporation

Toshio Takahashi

Seiji Shimizu

Kishio Arita

Yuko Kobayashi

Minoru Yoshida

Hideki Kohno

Hideyasu Takato

Akiyoshi Tochigi

Shigeo Kato

Takayuki Hayakawa

Takaji Suzuki

Shigeo Kubota

Ikuo Uematsu

Masataka Hirai

Goro Yamauchi

Akio Miyoshi

Sadao Matuoka

Kiyoshi Murakawa

Shugo Kubo

Hajime Izumimori

Mitsushi Ishida

Hiroshi Tomishima

Kenichi Ono

Kazuhiro Kumasaka

A photometric apparatus which satisfies the demands for reductions in the size, thickness and cost and which is highly optioned despite a simple arrangement. A photometric optical system provided separately from a photographic optical system ( ) has at least one diffractive optical element ( ). The diffraction surface of the diffractive optical element ( ) is provided on a convex lens surface to have a converging action. Alternatively, the diffraction surface of the diffractive optical element ( ) is provided on a concave lens surface to have a diverging action.

Photometric apparatus for camera

A real image type view finder comprising an objective optical system which has positive refractive power and forms an intermediate image, an image erecting optical system which erects the intermediate image and an eyepiece optical system which leads the intermediate image to an observer's eye, in which the objective optical system comprises a first positive lens unit, a second negative lens unit, a third negative lens unit and a fourth positive lens unit, moves the second lens unit and the third lens unit for a magnification change, has a vari-focal ratio on the order of 4, and has favorable optical performance over an entire zooming region.

Real image type view finder

A real image mode finder optical system includes an objective optical system with a positive refracting power, an image erecting optical system having a plurality of reflecting sections for erecting an image formed by the objective optical system, and an ocular optical system for introducing an erected image into an observer's eye. At least one lens of the objective optical system or the ocular optical system is configured to be rotational asymmetrical with respect to the optical axis, and a light-blocking member for blocking reflected light at the end face of the lens is provided adjacent to the lens or spaced away therefrom through air.

Real image mode finder optical system and lens

Real image mode variable magnification finder

Real image mode finder and camera using the same

A real image mode variable magnification finder includes, in order from an object side, an objective optical system with positive power, having at least three lens units; an image erecting device; and an ocular optical system with positive power. This finder also satisfies the following condition:

A photometric apparatus which satisfies the demands for reductions in the size, thickness and cost and which is highly optioned despite a simple arrangement. A photometric optical system provided separately from a photographic optical system (1) has at least one diffractive optical element (10). The diffraction surface of the diffractive optical element (10) is provided on a convex lens surface to have a converging action. Alternatively, the diffraction surface of the diffractive optical element (10) is provided on a concave lens surface to have a diverging action.

A photographic lens system which is composed, in order from the object side, of a first lens element having a positive refractive power, a second lens element having a negative refractive power, a third lens element having a positive refractive power, and a fourth lens element which has an aspherical surface on the image side and a negative refractive powers. An aperture stop is disposed between the second lens element and the third lens element or between the third lens element and the fourth lens element. This photographic lens system has a large aperture, favorable optical performance within a photographing range from infinite distance to an extremely short distance, a compact size and a simple composition, and can be manufactured at a low cost.

Photographic lens system

An electromagnetic flow meter which performs a zero-point and span calibrating operation and an initial setting verifying operation in an inspection mode which is inserted on an interrupt basis at a certain frequency during a measurement mode. Flow measurement data in each inspection mode is calculated using measurement data preceding and/or following the inspection mode, whereby an inspection operation is implemented without leaving the flow measurement data indeterminate in each period of the inspection mode.

Electromagnetic flow meter

A radiation detecting apparatus includes a pair of substrates disposed face to face in such a manner that a plurality of grooves provided in one of the facing surfaces at a predetermined interval face a plurality of grooves provided in the other of the facing surfaces at the predetermined interval. Radiation shielding plates are inserted at both ends thereof into a facing pair of grooves to be held by both of the substrates, scintillators are mounted on a corresponding one of the radiation shielding plates, and photodetectors are fixed to either one of the facing surfaces of the substrates between adjacent grooves so that a plurality of facing pairs of photodetectors are juxtaposed.

Radiation detecting apparatus

A copper alloy which is high in strength and electroconductivity is manufactured by casting, without chill casting, a copper alloy mass substantially consisting of copper and containing 0.2 to 1.5% by weight of chromium and 0.01 to 0.5% by weight of tin, hot working the cast copper alloy mass, then cooling, not slowly, the hot worked alloy mass without being subjected to any solid solution treatment, further cold working the cooled alloy mass, and thereafter subjecting the cold worked alloy mass to an aging treatment.

Method for manufacture of high-strength high-electroconductivity copper

Copper-nickel-tin alloys having high tensile strength and conductivity suitable for lead conductor materials for integrated circuits are produced by melting a starting material containing 0.5-3.0% by weight of Ni, 0.3-0.9% by weight of Sn, 0.01-0.2% by weight of phosphorus and 0-0.35% by weight of at least one of Mn and Si other than Cu, casting the molten metal, rolling conventionally the cast into a sheet having a thickness corresponding to more than 60% of cold reduction rate of the final necessary gauge, annealing such a rolled sheet at a temperature of 300-395.degree. C. for 1 hour, cold rolling the annealed sheet and annealing the cold rolled sheet at a temperature of 150-250.degree. C. for 1 hour.

Copper-nickel-tin alloys for lead conductor materials for integrated

A semi-hard magnetic alloy is described which consists of, by weight, 15-50% Co, 5-25% Ni, 1-9% Cr, balance Fe and incidental impurities and containing further a positive amount of up to 10% Cu or Ti. The alloy is characterized by exhibiting composite hysteresis characteristics as shown in FIG. 3 of the drawings. The alloy may be produced by a repetitive cold-working and subsequent annealing steps, the annealing step being carried out at temperatures of between 450.degree. and 750.degree. C.

Semi-hard magnetic alloy with composite magnetic property and method of

Manufacture of an aluminum-aluminum oxide dispersion composite conductive material (hereinafter referred to as Al-Al.sub.2 O.sub.3 dispersion composite conductive material) by compacting aluminum powder prepared by the atomization method, the particles having an oxide film with a thickness of about 100 A, and heat-treating the resultant compacted material in a vacuum or in a reducing gas or inert gas atmosphere at a temperature of 660.degree. to 700.degree.C. The composite conductive material thus obtained has a structure, in which the aluminum oxide is uniformly dispersed in aluminum, and it is capable of high speed wire drawing. Its electrical conductivity is 56.5 to 63.2 percent IACS (International Annealed Copper Standard), and its aluminum oxide content is 0.01 to 0.2 weight percent.

Growing community of inventors

Hachioji, Japan

Toshio Takahashi