Shin-etsu Chemical Co., Ltd.

Matsushita Electric Works, Ltd.

Sharp Kabushiki Kaisha Corporation

Makoto Fujiwara

Satoshi Nakayama

Tadashi Amano

Junichi Watanabe

Yoshie Watari

Wataru Sanematsu

Mitsuo Nakatani

Ichiro Kaneko

Shigehiro Hoshida

Masahiro Usuki

Yoshitsugu Eguchi

Tatsuya Fujimoto

Toshimichi Koga

Michio Aizawa

Hiroyuki Iwata

Chizuko Mishima

Toshikatsu Yamamuro

Youhei Ishigami

Shigeki Sasaki

Yoshihiro Oishi

Mitoshi Sakaguchi

A pulse signal delay circuit comprises: a first pulse edge delay circuit for generating a first delay timing signal for sequentially outputting a first edge detection delay timing gained by detecting the rising edge of an input pulse signal and delaying the detection timing by a constant delay time a predetermined number of times; a second pulse edge delay circuit for generating a second delay timing signal for sequentially outputting a second edge detection delay timing gained by detecting the falling edge of the input pulse signal and delaying the detection timing by the delay time the number of times; and a delay pulse signal generating circuit for generating and outputting delay pulse signals rising and falling according to the first and second edge detection delay timings, respectively, from the first and second delay timing signals, the first and second edge detection delay timings delayed the same number of times.

Pulse signal delay circuit and LED drive circuit

A flexible metal foil/polyimide laminate is prepared by applying a polyamic acid varnish onto a very thin copper foil on a carrier, semi-drying the varnish, laminating a polyimide film to the varnish-coated copper foil using a hot roll press, and heat treating the laminate for solvent removal and imidization in an atmosphere having a controlled oxygen concentration. A polyimide adhesive layer resulting from the imidization of polyamic acid has a thickness of up to 6 &#x3bc;m, the sum of the thicknesses of the polyimide film and the polyimide adhesive layer is up to 25 &#x3bc;m. The polyimide adhesive layer has a Tg&#x3e;400&#xb0; C.

Preparation of flexible copper foil/polyimide laminate

A linear oscillating actuator gives a smooth reciprocatory movement with a minimum of incidental vibrations or stresses. The actuator includes an oscillator carrying a permanent magnet as well as an output shaft which is adapted to be connected to drive a load, and a stator assembly carrying an electromagnet. The electromagnet generates a magnetic field which interacts with the permanent magnet to reciprocate the oscillator relative to the stator assembly in a linear path. A spring link is provided to resiliently support the oscillator to the stator assembly with a gap distance left therebetween for allowing the oscillator to reciprocate in the linear path. The spring link is configured to deform resiliently also in a direction other than along the linear path so as to allow the oscillator to move to and away from the stator assembly or to twist relative to the stator assembly. Thus, the spring link can absorb incidental stresses or displacements from which the oscillator may suffer in the directions other than along the linear path, assuring to give a smooth reciprocatory movement to the oscillator with a minimum of fatigue accumulated in the spring link.

Linear oscillating actuator

A reciprocating linear actuator capable of reciprocatingly driving a plurality of movable elements (and) by a single stator (). The movable elements (and) are connected to each other through a connection body () having a spring characteristic to be capable of displacement in the reciprocating direction of the movable element. The connection body () has such a shape that can be drawn with a single stroke on a two dimensional plane, and at least both ends thereof are connected to the movable elements (and), respectively. Since the connection body () is made of a flat spring, it requires less space for installation as compared to a connection body formed of a coiled spring. Further, since the entire connection body has an effective spring characteristic, a relatively smaller size is required for the connection body to provide a required spring characteristic. The less installation space for the connection body () is advantageous to a reduction in size of the linear actuator.

Reciprocating linear actuator

A process for producing a vinyl chloride polymer comprises subjecting a vinyl chloride monomer or a mixture comprising a major proportion of a vinyl chloride monomer along with at least one co-polymerizable monomer to suspension polymerization in an aqueous medium in the presence of a monomer-soluble polymerization initiator. The monomer-soluble polymerization initiator comprises, in combination, (A) a compound which is free of a benzene ring, a cyclohexyl group and an alkoxy group in the molecule and whose 10 hours half-life temperature at a concentration of 0.1 mole/liter of benzene is in the range of 30.degree. to 50.degree. C. and (B) 1-cyclohexyl-1-methylethyl peroxyneodecanoate.

Process for producing high-quality vinyl chloride polymers using a

The preparation of vinyl chloride-type polymers by suspension polymerization of vinyl chloride monomers in the presence of monomer-soluble polymerization initiators, wherein the monomer-soluble polymerization initiators utilized are a combination of (A) a compound which possesses neither a benzene ring nor an alkoxyl group, and has a half-life of 10 hours at 0.1 mol/l concentration in benzene solution at a temperature of 40.degree.-50.degree. C., and (B) 1-cyclohexyl-1-methylethylperoxy pivalate. This method yields vinyl chloride-type polymers the qualities of which such as an initial colorization and thermal stability are effectively improved, without being affected by the limitations accompanied by the insufficient cooling capacity of the polymerization vessel in general. The preparative method further enables one to effectively avoid scale deposition in the polymerization vessel.

Process for the production of vinyl chloride polymers using a

A miniature diaphragm pump comprises a motor having an output shaft rotating about its axis, an eccentric pin fixed in eccentric relation to the axis of the output shaft, a drive member connected to the eccentric pin to be driven thereby to reciprocate in a direction perpendicular to the axis of the output shaft, at least one pump chamber disposed radially outwardly of the drive element with respect to the axis of the output shaft and having inlet and outlet valves. Each pump chamber has one diaphragm surface with a rigid joint rod and is connected with the drive member through the joint rod. The reciprocating motion of the drive member is transmitted to each pump chamber such that one pumping action including a compression step and an inflation step is provided to the respective pump chamber during one revolution of the eccentric pin about the output shaft. In addition, since the drive member is reciprocated in the direction perpendicular to the output shaft, it is not necessary to take a large space between the motor and each pump chamber for obtaining the reciprocating motion of the drive member, so that the diaphragm pump as a whole becomes to be small.

Miniature diaphragm pump

A constant-speed exhaust valve device has a valve body of a cylindrical shape opened at both axial ends, and a push means disposed to apply an axial compressive force to the valve body, whereby the exhaust speed of the device can be made steady and manufacturing yield of the device is made excellent.

Constant-speed exhaust valve device for hemadynamometer

A process for producing a vinyl chloride polymer by polymerizing a monomer comprising vinyl chloride by suspension polymerization in a polymerization vessel on the inner wall surface of which a coating of a polymer scale preventive agent is formed, comprising the steps of applying a high-speed shearing force to a mixture comprising water, the monomer, a polymerization initiator, and (A) a dispersant comprising a partially saponified polyvinyl alcohol having a specified average degree of polymerization and a specified degree of saponification plus (B) a dispersant comprising a hydroxypropylmethylcellulose which has a specified methoxyl substitution degree, a specified hydroxypropoxyl substitution degree, and a specified viscosity and subjecting the mixture to said suspension polymerization. A vinyl chloride polymer having an average particle diameter of 200 to 600 .mu.m and a narrow particle size distribution and excellent in plasticizer take-up, etc. is provided.

Process for producing vinyl chloride resin

A coverlay film, which is used for protection of a flexible printed circuit board, is provided by the invention as being imparted with improved adhesiveness, heat-resistance against molten solder alloy, punching workability and other properties. The inventive coverlay film is characterized by the novel and unique formulation of the adhesive to form an adhesive layer on one surface of a substrate plastic, e.g., polyimide, film. The adhesive is formulated with an epoxy resin, carboxylated nitrile rubber, curing agent for the epoxy resin, curing accelerator and fine inorganic powder each of a specified type and in a specified weight proportion.

Adhesive composition and coverlay film therewith

A process of preparing a lower vinyl chloride polymer which comprises suspension polymerization of a vinyl chloride monomer of a mixture of unsaturated monomers consisting essentially of vinyl chloride, in an aqueous solvent, in the presence of a straight chain alkyl vinyl compound having an epoxy end terminal group represented by the formula I: ##STR1## wherein n is an integer of 2-20.

Process of preparing lower vinyl chloride polymer by suspension

A vinylidenefluoride-trifluoromethylethylene copolymer comprising vinylidene fluoride and trifluoromethylethylene as monomer units, said trifluoromethylethylene being contained in an amount of 0.1 to 30 mol % based on all the monomeric units in the copolymer. This copolymer is excellent in weathering resistance, corrosion resistance, electrical characteristics, and processability as well as flexibility.

Vinylidene fluoride trifluoromethylethylene copolymer

A process for producing a vinylidene fluoride copolymer, comprising the step of copolymerizing a mixture of monomers containing a polymerizable double bond comprising:

Growing community of inventors

Ibaraki, Japan

Makoto Fujiwara