摘要:
An LED lamp A1 includes a plurality of LED modules 1 and a substrate 2 on which the LED modules 1 are mounted in a row. A light guide 3 covering the LED modules 1 is provided on the substrate 2. The light guide 3 is held in close contact with each of the LED modules. With this arrangement, a proper amount of light is obtained with the use of a smaller number of LED modules 1 or with less power consumption.
摘要:
An LED illuminator includes a light emission circuit and a driver. The light emission circuit includes an LED group and a connection line connecting the LED group. The driver drives the LED group by using an AC voltage inputted from outside. The driver includes a constant-current control circuit. The constant-current control circuit keeps the current flowing to the light emission circuit at a predetermined value.
摘要:
A cleaning system includes: a sulfuric acid electrolytic portion configured to electrolyze a sulfuric acid solution to generate an oxidizing substance in an anode chamber, a concentrated sulfuric acid supply portion configured to supply a concentrated sulfuric acid solution to the anode chamber, and a cleaning treatment portion configured to carry out cleaning treatment of an object to be cleaned using an oxidizing solution comprising the oxidizing substance. The sulfuric acid electrolytic portion has an anode, a cathode, a diaphragm which is provided between the anode and the cathode, the anode chamber which is demarcated between the anode and the diaphragm and a cathode chamber which is demarcated between the cathode and the diaphragm.
摘要:
Disclosed is a lubricant oil composition comprising: (A) a fluorine-containing aromatic compound, and(B) an alkyl- or alkyl derivative-substituted aromatic compound having a kinetic viscosity of from 0.1 to 500 cSt as measured at 40 .degree. C., wherein:the compound (A) is represented by the formula:R(XR.sub.f).sub.n (A)wherein X represents an oxygen or a sulfur atom; n is an integer of from 1 to 4; R represents an n-valent, unsubstituted or substituted aromatic group having from 6 to 60 carbon atoms; and R.sub.f represents an unsubstituted or partially substituted fluorocarbon group having from 1 to 25 carbon atoms; andthe compound (B) comprises at least one substituted aromatic nucleus, wherein a substituent is an unsubstituted or substituted alkyl group having from 1 to 30 carbon atoms, or a derivative thereof. The lubricant oil composition having a kinetic viscosity of from 2 to 500 cSt as measured at 40.degree. C. The lubricant oil composition exhibits not only excellent miscibility with hydrofluorocarbon refrigerants and hydrofluoroether refrigerants over a wide temperature range, but also satisfy all requirements of properties for use thereof as a lubricant in refrigeration equipment, that is, low temperature fluidity, low moisture absorption properties, high electrical insulation, prolonged durability, and excellent lubricating properties.
摘要:
A fastener driving tool prevents the tool from twice striking, so-called double-driving in a single driving operation. A portion closing the lower end of a cylinder of the tool is formed with an annular recess to receive a ring bumper as a shock absorber of a piston. The recess has a sufficient depth to move a lower portion of the bumper downward and upward. The bumper is fittingly pressed into the recess to form an air chamber in the recess closed by the lower end of the bumper. A check valve is positioned between the air chamber and a supply of the pressurized air to feed the pressurized air to the air chamber so that the pressurized air is further compressed by the bumper which is downwardly moved by the abrupt downward movement of the piston. Thus, greater reaction force is applied from the air chamber to the lower portion of the bumper so as to prevent a driver of the tool from the double-driving.
摘要:
A lubricant for use in a refrigeration system using a tetrafluoroethane refrigerant, which comprises a fluorine-containing compound represented by the following formula: ##STR1## wherein X represents a multiple bond-containing monovalent group, and A represents a mono-, bi- or trivalent unsubstituted or partially substituted perfluorocarbon residue, a mono, bi- or trivalent unsubstituted or partially substituted perfluoroether residue or a mono-, bi- or trivalent unsubstituted or partially substituted perfluoropolyether residue.This lubricant has a good miscibility with a tetrafluoroethane refrigerant as represented by HFC-134a over a wide range of temperatures ranging from the low temperature to the high temperature and is excellent in properties, such as heat resistance, lubricating properties, electrically insulating properties and viscosity-temperature characteristics.
摘要:
A process for producing a polyether polyol with a content of 0.5 to 99.5% by weight of oxytetramethylene groups derived from tetrahydrofuran by copolymerizing tetrahydrofuran or a mixture of tetrahydrofuran and other cyclic ether copolymerizable therewith with a polyhydric alcohol having two or more hydroxyl groups per one molecule with the use of a heteropoly-acid and/or its salt as a catalyst, which comprises allowing 0.1 to 15 molecules of water per one heteropoly-anion to exist in the catalyst phase.The above-described polyether polyol is an industrially useful polymer which is a starting material for polyurethane to be used for spandex or a synthetic leather, etc.
摘要:
A process for producing a polyether polyol with a content of 0.5 to 99.5% by weight of oxytetramethylene groups derived from tetrahydrofuran by copolymerizing tetrahydrofuran or a mixture of tetrahydrofuran and another cyclic ether copolymerizable therewith with a polyhydric alcohol having two or more hydroxyl groups per one molecule with the use of a heteropoly-acid and/or its salt as a catalyst, which comprises allowing 0.1 to 15 molecules of water per one heteropoly-anion to exist in the catalyst phase.The above-described polyether polyol is an industrially useful polymer which is a starting material for polyurethane to be used for spandex or a synthetic leather, etc.
摘要:
An LED lamp (A1) includes LED chips (21) and a heat dissipation member (3) that supports the LED chips (21), and the heat dissipation member (3) includes an LED mount (31) on which the LED chips (21) are mounted, and a slope portion (32) extending from the LED mount (31) opposite a main emission direction of the LED chips (21) and in a direction inclined with respect to the main emission direction. Such a configuration allows a wider range to be illuminated.
摘要:
A cleaning system includes: a sulfuric acid electrolytic portion configured to electrolyze a sulfuric acid solution to generate an oxidizing substance in an anode chamber, a concentrated sulfuric acid supply portion configured to supply a concentrated sulfuric acid solution to the anode chamber, and a cleaning treatment portion configured to carry out cleaning treatment of an object to be cleaned using an oxidizing solution comprising the oxidizing substance. The sulfuric acid electrolytic portion has an anode, a cathode, a diaphragm which is provided between the anode and the cathode, the anode chamber which is demarcated between the anode and the diaphragm and a cathode chamber which is demarcated between the cathode and the diaphragm.