Abstract:
According to the present invention, when a semiconductor element (7) having protruding electrodes (5) formed thereon is connected to a circuit board (1) via conductive resin (6), stable connection is made even when an electrode pitch is small on the semiconductor element (7). On semiconductor element package regions on the circuit board (1), a paste electrode material (2) containing photopolymerizable materials is printed to form a film having a prescribed thickness, and this electrode material film (2) is baked after exposure and development thereof so as to obtain circuit electrodes (4) having edges warped in a direction of going apart from the circuit board (1) surface. Then, the protruding electrodes (5) and the concave surfaces of the circuit electrodes (4) are brought in abutment with each other and connected via the conductive resin (6) which surrounds the abutments between the respective electrodes and is held on the concave surfaces of the circuit electrodes (4). With this arrangement, the concave surfaces of the circuit electrodes (4) act as saucers and prevent the conductive resin (6) from being squeezed out, thereby eliminating possible occurrence of short circuits.
Abstract:
The invention relates to an electrical circuit placed on a substrate (10) with at least one component (30; 40) which is fastened to a conductor track layer (20; 21; 22; 23; 24; 25) and which is surrounded by recesses (50; 51; 60) provided in the conductor track layer. The invention also relates to a substrate comprising at least one conductor track layer for fastening at least one electrical component, whereby the conductor track layer is provided with recesses that form a flow barrier for a joining material used for fastening the component. Said recesses surround an area for fastening the component and are interspaced in such a manner that the component has space between the recesses without the recesses having to be covered by the component.
Abstract:
A method for forming low-impedance high density deposited-on-laminate (D/L) structures (10) having reduced stress features reducing metallization present on the laminate printed circuit board (12). In this manner, reduced is the force per unit area exerted on the dielectric material (30) disposed adjacent to the laminate material (16) which is typically present during thermal cycling of the structure.
Abstract:
The invention relates to a microstrip arrangement comprising a first and a second microstrip conductor. The two microstrip conductors have essentially the same dimensions in their longitudinal direction and transverse direction, and are galvanically interconnected by means of at least one connection. The two microstrip conductors also extend essentially parallel to one another on either side of a dielectric material. As a result of this design of the microstrip arrangement, the field losses and also other influences caused by the dielectric material will be very considerably reduced, and in practice a resultant microstrip arrangement is obtained, which, with regard to its electrical performance, appears to be suspended in the air. Preferred embodiments comprise a microstrip antenna, a circuit board and a conductor application.
Abstract:
The invention relates to a method of manufacturing a pattern of conductors (10) on a polyimide base (1). After the conductors (11) have been formed in known manner ridges (21) of an insulating material are formed in the metal-free zones by applying, exposing and developing a UV-sensitive resist. Subsequently, metal is deposited on the conductors (11), the ridges (21) preventing short-circuits.
Abstract:
An electric switch comprises a plastic part embedded in a punched metal disc, one of the flat faces of the disc being free of plastic over a large area. To ensure that the individual tracks of said disc are firmly seated in said area as well, the tracks have a section in this area deeper than the tracks themselves, whose narrow inside is contiguous with the plastic of the base plate and is anchored together with the corresponding track in the base plate.
Abstract:
A process for establishing durable and reliable contact between different layers of multilayer, preferably four-layer, printed circuit cards. In the four-layer cards which are bonded together and connected by means of borings the two outer layers e.g. the first and the fourth, are used for sign leading and card connection; the inner layers, e.g. the second and the third, are used for earthing and for the supply voltage. The distinctive feature of the process is that the boring connecting the outer, e.g. the first and/or the fourth, and the inner, e.g. the second and/or the third layers are before being metallized, rebored with a greater diameter from the appropriate direction up to the intermediate layer with the help of an electronically controlled bit. During this process the reaching of the intermediate layer is sensed and after having reached the required depth within this layer, the forward movement of the bit is stopped. After having made the necessary number of great diameter borings, their cylindrical jackets and the envelopes of the cones in the conducting layers are coated with copper in the known way. The present invention relates to a device, too, connected with the bore preferably for the process described above. The distinctive feature is that the bit enlarging the diameter of the borings has a device automatically regulating its forward movement, an electronic control and a sensor circuit. The bore (14) is in rigid contact with the controlled, automatic device (15) regulating its forward movement. The controlling input of this device (15) is connected with the output (a) of the electronic controll (16); the input of the electronic control (16) is connected with the output (b) of the sensor circuit (17). This circuit has two inputs, one (c) connected to the bore (14), the other (d) to the inner conducting layers of the multilayer printed circuit (13).
Abstract:
Die vorliegende Erfindung betrifft ein Verbundmaterial umfassend ein Keramiksubstrat S mit mindestens einer Metallschicht M an mindestens einer Oberfläche des Keramiksubstrates S, wobei diese Metallschicht M in lateraler und/oder vertikaler Richtung eine spezielle Form aufweist sowie ein entsprechendes Layout einer Leiterbahn und dessen Verwendung, ein Verfahren zur Herstellung mindestens einer Leiterbahn, eine Leiterplatte und ein Stanz- und/oder Prägewerkzeug.
Abstract:
Die Erfindung betrifft elektrisch leitende Bauteile, die mindestens aus einem Rohling bestehen, der auf seiner Oberseite eine gemittelte Rautiefe R z1 aufweist. Auf mindestens der Oberseite des Rohlings ist eine mittels Kaltgasspritzens aufgebrachte Beschichtung der Dicke s 2 aufgebracht, die auf ihrer vom Rohling abgewandten Oberfläche eine gemittelte Rautiefe R z2 aufweist. Die gemittelte Rautiefe R z2 der Beschichtung ist größer als die gemittelte Rautiefe R z1 der Oberseite des Rohlings. Aufgrund der großen Rauheit der Beschichtung ist es möglich, eine festhaftende Verbindung des Bauteils mit einer Kunststoffplatte zu realisieren. Die Erfindung betrifft ferner ein Verfahren zur Herstellung eines derartigen Bauteils sowie ein Verfahren zur Herstellung eines Werkstoffverbunds, der aus mindestens einem elektrisch leitenden Bauteil und mit mindestens einer Kunststoffplatte besteht.