Hitachi, Ltd.

Hitachi Chemical Company, Ltd.

Masaki Yoshii

Aizo Kaneda

Shigeo Tohyama

Hitoshi Yokono

Nobuhiro Tokushuku

Mitsuo Katayose

Kyohei Fukuda

Shinsuke Hagiwara

Hidemi Sato

Yasuo Amano

Hiroshi Jitsukata

Katashi Hazama

Nobuhiro Konuma

Sadao Minakawa

Hitoshi Yanagihara

Fumio Furusawa

Ryoichi Ikezawa

Takeo Murakoshi

Mitsunori Oka

Naoki Nara

Takaki Kashihara

Yoshinori Endou

Masayoshi Aoki

Hideyuki Chaki

Yoshihiro Mizukami

Naotake Ebinuma

An encapsulating epoxy resin molding material, comprising (A) an epoxy resin, (B) a curing agent, and (C) an inorganic filler, wherein the inorganic filler (C) has an average particle size of 12 &#x3bc;m or less and a specific surface area of 3.0 m/g or more.

Epoxy resin molding material for sealing use and semiconductor device

A projection-type stereoscopic image display system is disclosed in which a left-eye projection light ray and a right-eye projection light ray are projected from behind a transparent screen thereby to display a stereoscopic image.

Projection type stereoscopic image display system

An optical disc consists of a base plate, a reflective thin layer, and a protective thin layer. The optical disc has a sample mark area having two sample marks, one of which is off-set on one side of a track, another of which is off-set at an opposite side of a track. These sample marks are produced by an injection molding with replica technique. At the time of the injection molding, additional pressure moves soft injected plastic resin, which causes double transcription of the sample marks. For preventing the double transcription, groove areas are provided on opposite sides of the sample mark area. The groove areas provide an anchor effect at the time of injection molding.

Optical information medium with sample mark area and multiple

A photoelastic effect measuring device comprising a single white light source, a prism dispersing light emitted by said white light source and a variable slit device, which selects an arbitrary spectrum of light thus dispersed is disclosed, in which for a photoelastic effect measurement using white light, the slit width is opened totally so that all the light spectrum pass therethrough so as to pass through a sample to be measured and for a photoelastic effect measurement using a specified monochromatic light beam, the slit width is controlled so as to have a predetermined opening so that only a specified light spectrum can pass therethrough so as to pass through a sample to be measured.

Photoelastic effect measuring device

An apparatus for measuring photoelasticity permitting to control mechanical stress applied to an elastic body, by visualizing phase differences of polarized light transmitted by the elastic body is disclosed. In such a prior art apparatus a quarter wavelength plate was used in order to obtain circularly polarized light. However, the precision of the circularly polarized light is worsened, when it works in a wide wavelength region. To the contrary, in an apparatus according to this invention, circularly polarized light is obtained by means of Fresnel's rhombic body. As the result good circularly polarized light can be obtained for a wide wavelength region from the visible region to the near infrared region and control of products including thin films and semiconductor substrates can be effected by visualizing mechanical stress therein.

Apparatus for measuring photoelasticity

A method of and an apparatus for molding a plastic wherein the injection pressure (transfer pressure) is switched to a holding pressure when the internal pressure of the mold cavity sensed by a pressure sensor reaches a predetermined injection pressure (transfer pressure), to initiate holding of the pressure applied to the cavity. The holding pressure is removed when the internal pressure thereof becomes zero or in accordance with the detection of a predetermined inflection point in the internal pressure which is indicative of a gate sealing point in the mold cavity or is brought to a predetermined value close to zero. The molded articles are of high precision finishes, and conservation of energy and natural resources can be achieved.

Apparatus for molding plastic

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Yokohama, Japan

Masaki Yoshii