Abstract: In a development device for developing an electrostatic latent image formed on an image bearing body, the development device includes: a developer bearing body for conveying a developer borne thereon to a developing area on the image bearing body; a plurality of magnetic poles provided inside the developer bearing body; a detaching magnetic pole including optional two adjoining poles of the plurality of magnetic poles which are arranged to have the same polarity as each other for forming a repulsive magnetic field to remove the developer on the developer bearing body; and a magnetic body provided in the vicinity of and spaced away from the detaching magnetic pole, for forming a repulsive magnetic field having the same polarity as that of the detaching magnetic pole.

Abstract: A ball joint includes a bearing seat crimped in place within a housing. A ball head of a ball stud slides in the bearing seat. A cylindrical crimpable portion of the bearing seat is inserted through a cylindrical portion of the housing. The bearing seat is fixed to the housing with two stopper portions. One of the stopper portions is formed by crimping the cylindrical crimpable portion against one of the ends of the housing. A dust cover is pushed between the ball stud and the other stopper portion. The stopper portion is enlarged outward using ultrasonic vibration. An inner side face of the cylindrical crimpable portion inclines outward at an angle ranging from 3.degree. to 20.degree. with respect to an axial direction of the cylindrical crimpable portion. A chamfered portion and rotation-stop portions, shaped like flower petals, are formed at one end of the housing.

Abstract: A flange portion of a ball stud includes a seat surface which abuts a junction face of a concurrent rotation prevention plate. By ensuring that the contact face of the concurrent rotation prevention plate has a larger area than an area of the seat surface of the flange portion of the ball stud, the frictional force between an attached item and the contact face of the concurrent rotation prevention plate is greater than a rotational force applied to the ball stud when a nut is affixed to the ball stud. The ball stud is thus prevented from concurrently turning with the nut during a tightening or loosening operation.

Abstract: For removably receiving in a predetermined direction a printed circuit board (11) having first and second side edges, a socket connector comprises an insulator housing having first and second longitudinal ends, a bell crank (33) consisting of first and second crank arms (33(1), 33(2)) pivoted by an axle (29) to the insulator housing at the first longitudinal end, and a push-button (31) for pushing the first crank arm. When the push-button is pressed substantially downwardly in the predetermined direction, the first crank arm rotates outwardly relative to the predetermined direction around the axle. The second crank arm rotates to lift up the first side edge of the printed circuit board. It is preferred that the insulator housing comprises a longitudinal rod (17) preferably having a groove (21) and first and second side members (19(1), 19(2)) extended from the first and the second longitudinal ends to define extensions of the groove for removably receiving the printed circuit board.

Abstract: A low thermal expansion cordierite aggregate, which consists mainly of cordierite crystals having a mean crystal diameter of at least 50 .mu.m and has little orientation in the crystal structure, shows hysteresis in its thermal expansion property accompanying a rise and fall of the temperature, and has a mean thermal expansion coefficient within a temperature range of from room temperature to 1000.degree. C. of at most 10.times.10.sup.-7 /.degree.C.

Abstract: A resin magnetic compound is disclosed, comprising (i) from 65 to 77% by weight of a magnetic powder having been surface treated with from 0.01 to 5% by weight, based on the magnetic powder, of a mercaptosilane represented by the following formula (I) or a hydrolysis product of the mercaptosilane:(RO).sub.n R'.sub.(3-n) SiR"SH (I)wherein R and R' each represents an alkyl group having 1 or 2 carbon atoms; R" represents an alkylene group having from 2 to 6 carbon atoms; and n represents 2 or 3, (ii) from 14 to 30% by weight of polyphenylene sulfide resin, and (iii) from 9 to 21% by weight of glass fiber. The resin magnetic compound and a molded article obtained from the compound are excellent in thermal shock resistance, magnetic characteristics, and heat resistance.

Abstract: A low thermal expansion cordierite aggregate, which consists mainly of cordierite crystals having a mean crystal diameter of at least 50 .mu.m and has little orientation in the crystal structure, shows hysteresis in its thermal expansion property accompanying a rise and fall of the temperature, and has a mean thermal expansion coefficient within a temperature range of from room temperature to 1000.degree. C. of at most 10.times.10.sup.-7 /.degree.C.

Abstract: A resinous soft magnetic composition is constituted by (a) 80-95 wt. % of a powdery soft magnetic material, and (b) 5-20 wt. % of a resin component comprising (1) 70-99.5 wt. % of a polyarylene sulfide resin, and (2) 0.5-30 wt. % of an ultrahigh-molecular weight polyethylene having a weight-average molecular weight of from about 4.times.10.sup.5 to about 7.times.10.sup.6. Because of the inclusion of the ultrahigh-molecular weight polyethylene, the magnetic composition is provided with an improved melt-flowability suitable for injection molding while retaining a sufficient soldering heat-resistance as represented by a freeness of a molded product thereof from cracking after dipping in a solder bath at about 260.degree. C. for 10 sec.

Abstract: Disclosed herein are electronic device sealing resin compositions containing (A) 40-25 parts by weight of a thermoplastic resin composed of 100-10 wt. % of a poly(arylene thioether-ketone) and 0-90 wt. % of a poly(arylene sulfide), (B) 60-75 parts by weight of an inorganic filler, and per 100 parts by weight of the sum of the thermoplastic resin (A) and inorganic filler (B), (C) 1.5-5 parts by weight of a silicone oil, (D) 10-15 parts by weight of a silicone rubber or (C) 0.5-3 parts by weight of a silicone oil and (D) 5-13 parts by weight of a silicone rubber. Electronic devices sealed using such resin compositions are also disclosed.

Abstract: For receiving a card board, each card edge connector comprises: (A) an insulator rod comprising conductive contacts for connection to connecting pads of the card board with an indent formed along a top edge thereof and (B) first and second levers pivoted on respective ends of the rod. Supported by the first lever, the card board is urged to the insulator rod until its bottom edge fits the indent. At the same time, the second lever is inwardly turned to fit a corresponding side edge of the card board. On detaching the card board, the second lever is supposed to be outwardly pulled by a user. Being pried by a wrench arm of the second lever, the card board is turned upwardly so that the card board is put out of a mechanical contact with the rod.

Abstract: Magnetic components having a higher permeability than those obtained from Ni-Zn-based ferrite powder can be obtained by molding a composition comprising 5-30 wt. parts of polyarylene sulfide resin and 70-95 wt. parts (providing 100 wt. parts with the resin) of Ni-Zn-Cu-based ferrite powder. The Ni-Zn-Cu-based ferrite has a composition represented by the following formula (1):Ni.sub.a Zn.sub.b Cu.sub.c Fe.sub.2 O.sub.d,wherein a, b, c and d are numbers satisfying 0.10.ltoreq.a .ltoreq.0.70, 0.10.ltoreq.b.ltoreq.0.80, 0.10.ltoreq.c.ltoreq.0.35 and 3.97.ltoreq.d .ltoreq.4.20.

Abstract: Disclosed herein are electronic device sealing resin compositions containing (A) 40-25 parts by weight of a thermoplastic resin composed of 100-10 wt. % of a poly(arylene thioether-ketone) and 0-90 wt. % of a poly(arylene sulfide), (B) 60-75 parts by weight of an inorganic filler, and per 100 parts by weight of the sum of the thermoplastic resin (A) and inorganic filler (B), (C) 1.5-5 parts by weight of a silicone oil, (D) 10-15 parts by weight of a silicone rubber or (C) 0.5-3 parts by weight of a silicone oil and (D) 5-13 parts by weight of a silicone rubber. Electronic devices sealed using such resin compositions are also disclosed.

Abstract: Disclosed herein are electronic device sealing resin compositions containing 100 parts by weight of a thermoplastic resin mixture composed of 25-60 wt. % of a poly(arylene sulfide) and 40-75 wt. % of an inorganic filler; and 1.5-5 parts by weight of an epoxy-modified silicone oil having an epoxy equivalent of 350-1,000 g/eqiv. Also disclosed are electronic devices sealed using such resin compositions.

Abstract: To prevent toner in a waste toner collection box incorporated in a process cartridge from becoming melted and solidified due to the heat generated by a fixing device positioned below the waste toner collection box, a duct is provided therebetween. The duct may be integrally provided below the waste toner collection box or above the fixing device. A fan, which faces one end of the duct, moves the air therein. One or both ends of the duct may be provided with a handle, which also serves as a wide mouthed extension to the duct.

Abstract: A monoclonal antibody against human manganese-superoxide dismutase characterized in that it is produced by a cell line which has been obtained by immunization of a mouse with human Mn-SOD and then fusion of lymphocytes obtained from the mouse with mouse myeloma cells, and has high specificity against human Mn-SOD; a method for producing a monoclonal antibody against human Mn-SOD having high specificity against human Mn-SOD, which comprises culturing the cell line obtained by immunization of a mouse with human Mn-SOD and then cell fusion of lymphocytes obtained from the mouse with mouse myeloma cells; a kit for assaying human Mn-SOD, comprising:(a) a monoclonal antibody having very high specific immuno-reactivity against human Mn-SOD; and(b) a reagent of a monoclonal antibody having very high specific immuno-reactivity against human Mn-SOD labelled with an enzyme (enzyme labelled antibody); a method for assaying human Mn-SOD use of the kit; a novel diagnostic method of human epithelial ovarian cancer, which co

Abstract: A plug connector comprising a rigid insulator plate made of an electrical insulator, and contact strip members embedded in the insulator. The insulator plate comprises a mating portion for mating with a socket contact and a mount portion for mounting the plug connector on a circuit board. The contact strip members extend in a surface of the circuit board from the mating portion to the mount portion and are led out from the mount portion to provide connecting portion for electrically connecting with the circuit board. The top surfaces of the contact strip members are exposed in the surface of the mating portion and form contact surface for coming into contact with socket contacts of the socket connector mating with the mating portion.

Abstract: A ball joint uses a single-piece ball seat of hard plastic that has high rigidity, high load durability and elasticity, to prevent premature fracture of the ball seat caused by manufacturing imperfections in the socket of the ball joint. A preload contact surface is resilient supported at the top of the ball seat to enable uniform distribution of preload of the ball to the socket. At assembly of the ball joint, a cylindrical lower portion of the ball seat cylinder is reshaped into an inwardly bowed surface to envelop the lower portion of the ball. A thin annular wall at the periphery of the preload contact surface of the ball seat defines a thin annular space between itself and the upper portion of the ball seat cylinder to provide the preload contact surface with expansion space. Additional elasticity can be built into the ball seat by providing slits at the junction of the preload contact surface periphery and the base of the thin annular wall.

Abstract: A ball joint has a ball seat fitted in a through hole of a socket. A recessed part of the socket has the same diameter as a receiving part of the ball seat. An attaching part of a dust cover is clamped into the recess formed by the recessed part and the receiving part to seal the interior of the ball joint from the entry of moisture and dirt, and to provide lateral support to the ball seat. A double-ended version is disclosed wherein attaching parts of two dust covers seal and provide lateral support to opposed ends of the ball seat.

Abstract: A ball joint wherein a ball seat having a closed side is insertewd between an inner surface of a housing and an outer surface of a ball portion of a ball stud, the ball seat being formed of a hard synthetic resin, and having an annular flange after on the closed side of the ball seat engaged with an opened edge at one side of the housing, an annular flange engaged with an opened edge at the other side of the housing, and an annular recess provided on the inner circumferential side of the annular flange on the closed side of the ball seat and enabling the same annular flange.

Abstract: An electrostatic reproducing apparatus wherein a color picture image is formed on an image retainer with a color toner, and which has detector means which applies light from a light source to both the image retainer and the color picture image and detects the light reflected thereby. The light source is employed which emits light that does not include a high spectral reflectance region for the toner employed to form the picture image. The color picture image is constituted by a plurality of color picture images of different colors.