Hitachi, Ltd.

Hitachi Video and Information System, Inc.

Yoshihisa Hosoe

Hitoshi Yokono

Yasuo Hira

Susumu Tsuzuku

Masao Gotoh

Shinji Tanaka

Kazuo Sato

Yoshio Kawamura

Junichi Ikoma

Sadayuki Nishimura

Hiroyuki Kohida

Akio Nakashima

Noboru Sugimoto

Akira Okamoto

Tatsumi Hasebe

Masatoshi Sakurano

Shinpei Otsu

Hiroshi Kaneko

Nobuyoshi Tobita

Shigeru Chikamatsu

Motoaki Matsui

Noriyoshi Totsuka

Yasutoshi Nakashima

Akira Sekiguchi

There is provided the construction of a multiprojection apparatus composed of a plurality of projection units arranged in the vertical and horizontal directions, in which a transparent holding strip having an H-shaped cross section is inserted between screens each composed of a lenticular sheet and a Fresnel lens, and the right and left ends of a multiscreen are supported by elastic support members, or in which a receive member for receiving the screen in the direction of the optical axis and a screen holding device are provided, the receive member has such a shape as not to block projection light corresponding to an image on the screen and is located near a joint of the screen and another screen, and the holding device is disposed on a black stripe of the lenticular sheet and always pulled by an elastic member toward the receive member. Therefore, according to the present invention, it is possible to restrict the missing of information due to joints of the screens.

Multiprojection apparatus

Disclosed is a cell manipulating apparatus for conveying cells to a plurality of chambers provided in a chamber plate. The apparatus comprises a taking-up device adapted to take up cells to the respective taking up portions of a carrier plate placed in positions corresponding to those of said chambers in the chamber plate and a moving device adapted to move, relatively with respect to the chamber plate, the taking-up device to a position above the chamber plate. The taking-up portions may be effectively composed of pressure-controlled cavities or SiO.sub.2 films provided in the carrier plate.

Cell manipulating apparatus

A screen for projection television set comprising a foamed support and a reflective film adhered to the concave side of the support, said support having the outer layers with a high density such as 0.7 to 1.2 g/cm.sup.3 and the inner portion with a low density so as to make the density of the foamed support as a whole 0.2 to 0.5 g/cm.sup.3, has good projection properties, surface hardness with sufficiently strong support. When said support is foam molded by using a polyurethane having special polyol components, its heat resistance is remarkably increased and can be foam molded at high temperatures without deformation.

Screen for projection television

Rigid polyurethane foams having excellent heat resistance and impact resistance can be produced with good workability due to good flow properties by using a composition comprising a polyol, a polyisocyanate, a blowing agent and a reaction accelerator as essential component, characterized by using as the polyol, a mixture of (a) an alkylene oxide adduct of 4,4'-diaminodiphenylmethane having OH value of 280-600 mg KOH/g, (b) an aliphatic polyether having a hdyroxyl value of 450-800 mg KOH/g and 3 or 4 hydroxyl groups in the molecule, and (c) a polyether having a hydroxyl value of 30 to 100 mg KOH/g and 2 or 3 hydroxyl groups in the molecule, in limited amounts.

Process for producing rigid polyurethane foam

Equipment for producing a high voltage rectifying unit wherein there is a resin ingredient tank and a curing agent tank for storing separately the resin ingredient and the curing agent, a closed mixer for mixing the resin ingredient and the curing agent, a vacuum chamber for injecting a mixed thermo-setting resin composition into the high voltage rectifying unit, a chamber for defoaming the injected resin composition, a furnace for curing the injected resin composition by heating, and a carrier apparatus covered to isolate the external atmosphere which may carry the resin composition-injected high voltage rectifying unit from the defoaming chamber to the curing furnace, whereby the procedures from vacuum injection to curing can be carried out continuously and automatically.

Equipment for producing high voltage rectifying units

Growing community of inventors

Yokohama, Japan

Yoshihisa Hosoe