Abstract: A speaker holder for a speaker mounted on a printed circuit board. The speaker holder 50 comprises the speaker engagement portion 52 abutting the bottomed cylindrical portion 26A of the frame 26 of the speaker 10 and a plurality of engagement legs 54 extending from the speaker engagement portion 52. The speaker 10 is put tightly between the speaker engagement portion 52 and the printed circuit board 2 and fixed thereto via the engagement legs 54. Compared with the conventional speaker holder having separate structures for retaining the speaker and for fixing the holder to the printed circuit board 2, the mounting height of the holder 50 in state where the speaker 10 is mounted on the printed circuit board 2 via the holder 50 is considerably lowered. Further, the holder 50 is of a simple structure since a structure for retaining a speaker is not required.

Abstract: In a speaker unit, a case 40 is formed of a synthetic resin member having a case body 42 and a protective cover 44 integrally molded. Further, an opening portion 48 is formed in a surrounding wall 46 of the case body 42 and a beam 50 is formed inside of the case body 42. In a state where the speaker 20 is inserted into the case body 42 through the opening portion 48, the speaker 20 is held by the beam 50 and the protective cover 44 from its upside and downside.

Abstract: A frame 14 supporting a diaphragm 12 by its outer periphery is constructed by a connecting ring 30—which is formed in an annulus following the shape of the outer periphery of diaphragm 12—to base 28 which comprises a bottomed cylinder portion 28A and a mounting portion 28B which extends radially outward from the bottomed cylinder portion 28A which is a part of the magnetic circuit unit 18. The connection is achieved by the caulking of the ring 30 and the mounting portion 28B with the diaphragm 12 clamped therebetween.

Abstract: By forming a flange portion 16a1 protruding inward in the radial direction at an upper end portion 16a of a voice coil 16, a coiling sectional shape of the voice coil 16 is set to a L-shape. And, the upper end portion 16a of this voice coil 16 is bonded and fixed to a central flat portion 12b of a diaphragm 12. Hereby, by only increasing slightly the weight of the usual voice coil having an I-shaped coiling section, the large bonding area can be obtained between the voice coil 16 and the diaphragm 12, so that separation of the voice coil 16 can be prevented. Further, since other portions of the voice coil 16 than the upper end portion 16a thereof have the usual coil thickness, it is not necessary to expand the width of a cylindrical magnetic gap G in a magnetic circuit unit 18, whereby it is prevented that electroacoustic conversion efficiency of a speaker 10 lowers.

Abstract: Fixing of a voice coil 16 to a diaphragm 12 is performed by caulk-fixing a coil supporting member 26 to the diaphragm 12 and by fit-supporting the voice coil 16 by the coil supporting member 26. Hereby, the voice coil 16 is physically fixed to the diaphragm 12 and its fixing strength is heightened. The caulk-fixing is performed by subjecting a caulking projection of the coil supporting member 26 to a plastic deformation thereby to provide a caulk-fixed portion 26b, whereby deformation injurious to the acoustic property does not occur in the diaphragm 12. Further, the fit-supporting is performed by interposing a flange portion 16a1 formed at an upper end portion 16a of the voice coil 16 between an engaging engaging portion 26a of the coil supporting member 26 and a central flat portion 12b of the diaphragm 12 and holding it by them from upper and lower sides.

Abstract: A method for making hydrogen storage alloy powder comprises quenching a melt of a hydrogen storage alloy, breaking the quenched alloy into fine pieces provided that said alloy is in non-powder form after the quenching, and subjecting the fine pieces to treatment with a solution containing a conjugated unsaturated compound which has five or more conjugated &pgr; bonds in the molecule and a molecular weight of 100 or above.

Abstract: A method of producing a hydrogen absorbing alloy powder, which comprises a step of treating a pulverized hydrogen absorbing alloy with an acidic or alkaline solution of conjugated unsaturated compound having at least 5 conjugated .pi. bonds; and a negative electrode using a hydrogen absorbing alloy powder produced by the aforesaid method, which can ensure high initial activity and high initial capacity in the nickel-hydrogen secondary battery provided therewith.

Abstract: A powder of a hydrogen storage alloy which comprises metallic nickel in or on the surfaces of the powder in an amount sufficient to impart a magnetization intensity of 0.5 to 6 emu/g to the powder. The powder has a specific surface area of 0.15 to 0.7 m.sup.2 /g when determined according to a BET adsorption method, an oxygen concentration of 0.15 to 1.5 wt %, and an average particle size of 10 to 100 .mu.m, with a size distribution wherein the content of particles having a size of 8 .mu.m or below is in the range of 30 wt % or below. An electrode for secondary cells is also described, which comprises the powder defined above.

Abstract: A method of producing a hydrogen absorbing alloy powder, which comprises a step of treating a pulverized hydrogen absorbing alloy with a solution comprising a condensed phosphoric acid having 2 to 20 phosphorus atoms, phytic acid or a mixture thereof; and a negative electrode using a hydrogen absorbing alloy powder produced by the aforesaid method, which can ensure high initial activity and high initial capacity in the nickel-hydrogen secondary battery provided therewith.

Abstract: A method of producing a hydrogen absorbing alloy powder, which comprises a step of treating a pulverized hydrogen absorbing alloy with a solution comprising a conjugated unsaturated compound having at least 5 conjugated .pi. bonds and a molecular weight of at least 100 and, prior to the this step, optionally comprises a step of treating a pulverized hydrogen absorbing alloy with a mineral acid or alkali; and an electrode using a hydrogen absorbing alloy powder produced by the aforesaid method.

Abstract: An apparatus for automatically inspecting powdery products is disclosed having a plurality of automatic inspection devices each device processing, in parallel, a subdivision of a supplied sample of a powdery product. Each device is controlled by a corresponding terminal computer. To one terminal computer there are connected a device for reading sample information attached to the supplied powdery sample and a device for recording, on the sample subdivisions, information concerning conditions for inspection established by the terminal computer on the basis of the sample information read by the first reading device. To each of the other terminal computers there is connected a corresponding device for reading the information concerning conditions for inspection recorded on the subdivision of the sample. Each terminal computer controls the operation of the automatic inspection devices on the basis of the information concerning conditions for inspection read by each corresponding reading device.

Abstract: An apparatus for automatically determining the rate of plasticizer absorption of a powdery resin sample such as a vinyl chloride resin sample. The apparatus for automatically determining the rate of plasticizer absorption of a powdery resin sample is one in which the rate of plasticizer absorption is determined by treating, in a centrifugal separator 10, a powdery resin contained in an inspection container 2 together with an excess of a plasticizer, to remove from the powdery resin sample the excess plasticizer, and determining the amount of the plasticizer absorbed by and remaining in the powdery resin.

Abstract: An apparatus for automatically and continuously inspecting a powdery product for the presence of foreign substances as contaminants, which permits highly precise inspection of powdery products, comprises static charge eliminator 10 for eliminating electrostatic charges generated on a powdery sample supplied to the apparatus; hopper 41 for receiving and storing the powdery sample whose electrostatic charges have been eliminated and dropped onto the hopper through static charge eliminator 10; conveyor 42 for conveying the powdery sample, as a subject to be photographed, discharged from hopper 41 and spread over conveyor 42 in the form of a layer having a uniform thickness; and video camera 43 for photographing, over a predetermined visual field, the powdery sample on the subject-conveyor.

Abstract: An apparatus for supplying a solution of a powdery product as a specimen of viscosity measurement. The apparatus includes electronic discharge-weighing device (4) for determining the amount of the powdery sample in sample container (2), introduced into hopper (6) and discharged therefrom by vibration-generating drive (5); dissolution container (12) for receiving and dissolving the powdery sample from hopper (6); electronic balance (13)for weighing the powdery sample in container (12); supply source (14) for solvent into container (12); device (36) for heating and stirring the powdery sample and the solvent in container (12), and a control circuit for controlling the apparatus.

Abstract: A process to prevent scale adhesion on reactor surfaces when polymerizing vinyl monomers. Coating of internal reactor surfaces with a combination of an amino containing aromatic compound, and an alkali metal or ammonium salt of polyvinylsulfuric acid results in the scale prevention. This combination is applied to reactor surfaces via its mixture with a solvent and is subsequently dried to form the coating.

Abstract: An apparatus which permits continuous automatic determination of the bulk specific gravity of a powdery sample and highly precise measurement thereof. The apparatus comprises a robot 3 transporting a container 2 filled with a powdery sample; a funnel 4 provided with a damper, which receives the powdery sample discharged from the container 2; a damper-driving unit 5a for pulling out and pushing the damper 5; a sample sensor 7 for detecting the powdery sample dropped through the funnel 4 provided with a damper; a constant volume receiver 6 for receiving dropped through the funnel 4 provided with a damper; a scraping bar 8 for sliding the upper face of the constant volume receiver 6; a scraping bar-driving unit 8a for reciprocating the scraping bar 8; a constant volume receiver-conveying robot 21 transporting the constant volume receiver 6; an electronic balance 22 which determines the weight the powdery sample in the constant volume receiver 6; and a cleaner 23 for aspirating the weighed powdery sample.

Abstract: A polymer scale preventive agent for use in polymerization of vinyl chloride monomer or a monomer mixture containing vinyl chloride monomer as a major component, comprising:(A) a naphthoquinone natural dye and(B) a polyvinyl alcohol with a saponification degree of at least 50 mol %. The polymer scale preventive agent is formed as coating on the inner wall, etc. of a polymerization vessel. Deposition of polymer scale can be always effectively prevented. Polymers with a high whiteness can be produced, and products formed from the polymer have only a small number of fish eyes.

Abstract: A polymer scale preventive agent for use in polymerization of a haloethylene or a monomer mixture containing the same, comprising:(A) an aromatic compound having at least one group selected from the class consisting of primary, secondary and tertiary amino groups, quaternary ammonium groups and the azo group and/or a dye having at least one group selected from said class, and(B) an alkali metal or ammonium salt of a polyvinylsulfonic acid, and(C) a naphthoquinone natural dye; a polymerization vessel having a coating comprising said scale preventive agnet. A process of preparing a haloethylene polymer using the vessel can produce a polymer of high quality without polymer scale deposition.

Abstract: A process for preparation of a vinyl chloride polymer comprising the steps of subjecting an aqueous medium containing vinyl chloride monomer or a mixture of vinyl chloride monomer with other vinyl monomer, a polymerization initiator and a dispersant to high-speed shear agitation at a shear rate of 10.sup.4 sec.sup.-1 or above to prepare a suspended dispersion containing fine particles of the monomer(s) dispersed therein, then subjecting the suspended dispersion to low-speed shear agitation at a shear rate of from 10 to 100 sec.sup.-1, and thereafter starting suspension polymerization. Even with a decreased amount of dispersant, the process inhibits the coarsening of the polymer particles, to yield the polymer with a narrow particle diameter distribution. Deposition of scale and formation of fish-eyes are also prevented effectively.

Abstract: An apparatus for continuous polymerization of vinyl chloride or a vinyl chloride-based monomeric mixture, comprising a pre-mixer 1 for preparing an aqueous suspension of the vinyl chloride or vinyl chloride-based monomeric mixture, and a polymer slurry tank 5 connected to the pre-mixer 1 through a polymerization passage comprising a piping 3, wherein a pump comprising a conical hub and an impeller mounted thereon comprised of a single spiral blade is used for drawing out the aqueous suspension from the pre-mixer into the polymerization passage and for discharging a polymer slurry formed in the passage into the slurry tank, and the polymerization passage has a length sufficient for permitting the vinyl chloride or vinyl chloride-based monomeric mixture contained in the aqueous suspension flowing through the passage to be polymerized to a predetermined extent while passing through the passage.