Abstract: This invention provides an optical component free from weld formation in its optical surface and having an excellent optical performance, a method of molding an optical component, and a mold for molding an optical component. For this purpose, an optical component as a plastic molded product having an optical function, is formed with a molding surface with a shape of a curved surface, and a flange portion between the molding surface and a gate portion. At least part of a surface constituting the flange portion is molded by injecting a molten resin along a wall surface that forms an angular difference of 15.degree. or less which is substantially equal to a tangential angle to the curvature of the curved surface of the molding surface, which is near the flange portion.

Abstract: A fixed roller is laterally axially supported by a movable body so as to ow an axial center line of the fixed roller to extend in parallel to a lateral direction, and driven to rotate an upper peripheral surface of the fixed roller backward, and a plurality of split press rollers respectively having the axes inclined by a predetermined angle with respect to an axial center line of the fixed roller as viewed in plan are arranged in a row in a lateral direction above the fixed roller in the manner of supporting the split press rollers by press roller frames. The split press rollers are energized to the descending side by oil-hydraulic cylinders respectively provided between a frame of the body and the press roller frames so as to bring the lower peripheral surface side of each split press roller into contact with the upper peripheral surface of the fixed roller under the action of pressure.

Abstract: When a welding tip is moved from one welding point to a successive welding point, a robot and a welding gun are operated simultaneously with each other during a first time period between an issue of a pressurizing start signal and finish of the pressurizing, and again during a second time period between an issue of a depressurization signal and finish of the depressurization so that a pressurization time period t.sub.1 and a depressurization time period t.sub.2 are eliminated from a welding cycle time and the welding cycle time is shortened. A welding gun which includes a servo motor and a ball screw for converting a rotation of the servo motor to a stroke of the welding tip is used, and the stroke of the welding tip is counted as one axis of the robot, and the welding tip motion is controlled by a robot controller.

Abstract: There are provided a plastic molded optical element and a molding mold therefor capable of preventing flash generation as well as making the handling of the molded optical element easy by forming a projection on the main body of an optical element, corresponding to the matching portions (parting planes) of the molding members of the molding mold or die members for molding the optical element. A thin projection is formed on the main body of the optical element in a thickness required for securing a required strength in relation to the matching portions (parting planes) of the molding members or die member for molding the optical element.

Abstract: A method is provided for immobilizing and preserving an immunologically reactive antigen substance such as antigenic cells or non-cell bound antigens for use in solid-phase immunoassay. The antigen substance is adsorbed and crosslinked on a support and contacted with a protecting solution and containing sugar and an antiseptic substance such as NaN.sub.3. The antigen substance is preferably centrifugally contacted with the support to shorten the time for adsorption. Crosslinking is with a solution of 1.0 to 5.0% formaldehyde or 0.003 to 0.06% glutaraldehyde. The antigenic cells can be a blood component such as platelets.

Abstract: A detecting reagent for an antiplatelet antibody, comprises a carrier particle, and a platelet antigen component immobilized on a surface of the carrier particle. The reagent particles do not agglutinate with each other, contrary to the platelets subjected to natural agglutination, probably because the platelet membrane antigen component immobilized on the carrier particle is solubilized in advance.

Abstract: A servo motor system for a transportation line with the travel distance of the article predetermined and with a relatively low positioning accuracy. Basically, the system is constructed as an incremental servo motor system in which an incremental movement of the motor is detected, and the incremental movement signal is fed back to a motor driver, which also receives pulse signals from a controller corresponding to a traveling distance to a destination. Only one time after starting the operation of the servo motor system with the article not at the destination point, a stop signal is fed from an external signal generator located at the destination point to the motor driver, which stops the motor there. At this time, a coordinate system of the movable space of the article is established in the controller and the servo motor system is operated as an incremental system from the second time on, without utilizing an external signal generator.

Abstract: A transfer apparatus for transferring a plurality of workpieces has a pair of transfer rails along which run a plurality of jig pallets, each carrying a workpiece. A transfer bar is disposed between the pair of transfer rails so as to reciprocatingly move in the longitudinal direction of the rails. An engaging claw adapted to be driven up and down by a driving device is provided on the jig pallet, while a plurality of engaging blocks adapted to be engaged by the engaging claws are integrally provided on the transfer bar. The engaging claws are driven into and out of engagement with the corresponding engaging blocks so as to couple and uncouple the jig pallets and the transfer bar, whereby the jig pallets are transferred solely by linear motion of the transfer bar.

Abstract: A transfer apparatus for transferring a plurality of workpieces has a pair of transfer rails along which a plurality of jig pallets each carrying a work run. A transfer bar is disposed between the pair of transfer rails so as to reciprocatingly move in the longitudinal direction of the rails. A plurality of engaging claws are disposed on the transfer bar so as to be able to pivot in planes which are perpendicular to the direction of the transfer so as to be brought into and out of engagement with the respective jig pallets by the operation of a pair of cylinder devices arranged on both sides of the transfer bar. In consequence, the jig pallets are transferred solely by linear motion of the transfer bar.

Abstract: A microtiter plate is made of a light-transmitting antistatic resin and defines at least one well. The bottom wall of the well is centrally equipped with a flat portion having a diameter of at least 1 mm and is preferably connected continuously to the corresponding peripheral wall by way of a rising part. The minimum radius of curvature of the inner wall of said well, said inner wall including said rising part, is preferably at least 0.5 mm.

Abstract: A simultaneous multiple points sounding apparatus, comprising a plurality of weights to be suspended on burden charged in a furnace, a plurality of wire ropes attached to the weights with their one ends and extending at their other ends outside of the furnace, and a plurality of wire drums installed outside of the furnace on which the wire ropes are coiled, and a single driving device on which a plurality of wire drums are communicated, wherein the plurality of wire ropes are disposed on pulleys which travel downward when the respective weights reach the burden, thereby lessening the tension on the respective wire rope, and detectors are disposed for detecting the downward movement of the respective pulleys.