摘要:
A method and apparatus for continuously forming primed circuits, the apparatus including a cylindrical drum rotatable about a generally vertical axis and a tank for holding an electrolytic plating solution. The tank is dimensioned to surround a lower portion of the drum and immerse the lower portion of the drum in the electrolytic plating solution. Means for introducing electrolytic solution into the tank are provided, and a plurality of metallic anodes are disposed within the tank surrounding and facing the lower portion of the drum defining a generally uniform gap therebetween. A plurality of cathodes are disposed above the tank and facing an upper portion of the drum, the cathodes being biased toward the drum. The apparatus is adapted to receive a movable continuous flexible web having a thin layer of conductive metal on one side thereof. The metal layer is masked to expose a plurality of patterns aligned along the web and a continuous strip of exposed metal along one edge of the web. The web is to be positioned against the drum with the metal layer facing away therefrom and with the exposed patterns extending into the gap and facing the anodes. The continuous strip of exposed metal is above the tank and facing the cathodes wherein the cathodes are biased into electrical contact therewith as the web moves through the apparatus.
摘要:
A plurality of substituted styrene monomers, for example, urea substituted, is disclosed as well as polymers and copolymers made therefrom. Various thermoset plastic components can be reacted with the monomers, polymers, or copolymers of these substituted styrenes, as for example epoxy, which form a crosslinked system useful as an adhesive or a fiber reinforced substrate for circuit boards. The monomers are made by reacting aminostyrene type monomers with isocyanate containing molecules. One specific monomer is made by reacting a substituted aminostyrene with a monoisocyanate and has the following formula ##STR1##
摘要:
A solid electrolyte cell and method for producing it in which the cell components are assembled within a ceramic frame which is closed on the top by a first terminal of the cell using a solder seal and closed on the bottom by a second terminal of the cell using a solder seal and said second terminal having the opposite polarity to that of the first terminal.
摘要:
Electrodeposited planar resistive layers are disclosed, which may be combined with conductive layers and insulative layers to produce laminates useful in the preparation of printed circuit boards. The resistive layers are prepared by electroplating from an electroplating bath containing a source of a normally conductive metal component and a source of a non-metallic resistance increasing additive. Planar resistors may be produced which have sheet resistances in the range of from about 15 to about 1000 .OMEGA. per square.
摘要:
Copper conductive foil for use in preparing printed circuit boards is electrodeposited from an electrolyte solution containing copper ions, sulphate ions and thiourea. The thiourea operates to decrease the roughness of the foil, to enable operation at higher current densities, and/or to modify the tensile strength and ductility characteristics of the foil. An IPC Class 2 foil is prepared without annealing.
摘要翻译:用于制备印刷电路板的铜导电箔从含有铜离子,硫酸根离子和硫脲的电解液中电沉积。 硫脲的作用是降低箔的粗糙度,使得能够以更高的电流密度操作,和/或改变箔的拉伸强度和延展性。 制备IPC Class 2箔不退火。
摘要:
A highly stable high-voltage output buffer is provided which may be manufactured using standard CMOS technology. As part of the invention, the effects of voltage drift at one or more of the nodes formed between series connected P or N-channel MOSFET devices are generally reduced or eliminated. The present invention includes compensation circuitry which reduces the effects of parasitic coupling within the MOSFET devices, and which serves to compensate for any voltage drift which may occur at the nodes between series connected devices. In addition, the present invention provides a method and apparatus for increasing the current sourcing capability of a CMOS high-voltage output buffer, even under low supply V.sub.vf conditions, without necessarily increasing the size of the output device. Furthermore, the present invention provides a method and apparatus for reducing the effects of coupling along a shared bias line between a plurality of high-voltage output buffers in accordance with the present invention.
摘要:
A fuse holder having a base made of insulating material, a block having a planar contact surface for contacting a blade terminal of a fuse and two holes that are located on opposite sides of the surface and extend along axes parallel to the surface, one hole being a mounting hole extending through the block, the other the hole being a retainer hole ending at a transverse wire receiving hole, a resilient member that is retained on the block and has an arm that is biased toward the planar contact surface, a connector located in the mounting hole and securing the block to the base, and a wire retainer located in the retainer hole.
摘要:
An arresting device for gripping a cylindrical portion of an object having a hook member and a latch member which are operable to interact with each other to grip the object and hold it in a predetermined position. The device is operable to automatically release the object when such object is resupported.
摘要:
A device for slitting a metallic foil which is continuously fed along a path comprising a support base having an elongated guide formed therein, the guide defining a generally linear guide path, and the support base being positionable adjacent the foil path and a blade holder dimensioned to be received within the guide and be movable along the guide path, the blade holder dimensioned to hold a cutting blade having a linear cutting surface wherein the linear cutting surface is oriented generally parallel to the guide path; and a reversible drive member secured to the base operable to reciprocally move the blade holder along the guide path at a controllable rate of speed.
摘要:
A system for filtering solid-containing plating waste comprises a reusable filter media belt that travels in a continuous loop between a filter tray, where filtration takes place, and a multi-compartmented cleaning tank where the belt is cleaned for reuse. Each compartment in the tank is substantially closed at its lower end, and open at its upper end. The belt travels in and out of each of the tank compartments in sequence, being subjected to a liquid cleaning treatment in each by contacting sprays and/or bath immersion before being returned to the filter tray for reuse. A wringer is provided at the top of each compartment through which the belt passes before proceeding to the next compartment in order to isolate the treatment liquids from each other.