Abstract:
Die Erfindung betrifft eine Lichterzeugungsvorrichtung (1) für eine Kopf-oben-Anzeige (24) eines Kraftfahrzeugs (30), mit einer Leiterplatte (2) und zumindest zwei mittels zumindest einer Leiterbahn (10, 10a, 10b, 10c) in Reihe geschalteten, auf einer Vorderseite (4) der Leiterplatte (2) in einer Reihe angeordneten Leuchtdioden (3, 3a, 3b, 3c, 3d), deren jeweilige Orientierung auf der Vorderseite (4) durch eine Ausrichtung einer Kathodenseite (6) und einer Anodenseite (7) der jeweiligen Leuchtdiode (3, 3a, 3b, 3c, 3d) bestimmt ist, wobei die jeweils in der Reihenschaltung aufeinander folgenden Leuchtdioden (3, 3a, 3b, 3c, 3d) geometrisch im Wesentlichen entgegengesetzt orientiert angeordnet sind, um eine verbesserte Lichterzeugungsvorrichtung für eine Kopf-oben- Anzeige (24) eines Kraftfahrzeugs (30) bereitzustellen. Die Erfindung betrifft auch eine Kopf-oben-Anzeige (24) als auch ein Kraftfahrzeug (30).
Abstract:
A printed wiring board with a component connection pad, such as a solder pad, providing thermal stress compensation for a surface mount circuit component and method for making such a pad. The component connection pad includes opposed groups of multiple conductive fingers that are mutually connected at their far ends and separated at their near ends where they have surfaces for mounting a single surface mount circuit component.
Abstract:
A method for connecting circuit boards, comprising: (i) preparing a first circuit board having connection parts assigned to end parts of a plurality of conductor wirings, and a second circuit board having connection parts assigned to corresponding end parts of a plurality of conductor wirings; (ii) disposing the connection parts of the first circuit board to face the connection parts of the second circuit board with a thermosetting adhesive film between the connection parts of the circuit boards; and (iii) applying heat and pressure to the connection parts and to the thermosetting adhesive film sufficiently high to thoroughly push away the adhesive film so as to establish electrical contact between connection parts of the circuit boards facing each other and to allow for curing of the adhesive; wherein the conductor wirings constituting the connection parts of at least one of the first and second circuit boards contain non-linear wirings.
Abstract:
A method for connecting FPC to a second circuit board, comprising the steps of (i) preparing a flexible printed circuit board (FPC) and a second circuit board, (ii) disposing the connection parts of the FPC to face the connection parts of the second circuit board such that a thermosetting adhesive film is present between the connection parts of the FPC and the connection parts of the second circuit board, and (iii) applying heat and pressure sufficiently high to thoroughly push away the adhesive film for establishing electrical contact and allow for curing of the adhesive, wherein the ratio of conductor width (L)/conductor-to-conductor distance (S) in the conductor wiring end parts constituting the connection parts of FPC is 0.5 or less and the thermosetting adhesive film is adjusted to have a viscosity of 500 to 20,000 Pa.s at 200°C.
Abstract:
There is disclosed herein a surface mount printed circuit board having a substrate (10), at least one surface mount device (14), at least two mounting pads (12) per device (14), solder joints (24) connecting the terminations (22) of the device (14) to their respective mounting pads (12), at least one rectangular lifter pad (30) on the substrate (10) amid the mounting pads (12), and a solder mass (32) on each lifter pad (30) in contact with the bottom surface (18) of the device (14). The solder joint (24) has preferably convex outer fillets (28), the device (14) is maintained at a predetermined height (ho) above the mounting pads (12), the inner fillet angle ( alpha ) is maintained above a predetermined minimum angle to increase solder joint crack initiation time, and the overall solder joint crack propagation length is increased (li and lo). An alternative embodiment also includes plugged vias (34) under the lifter pads (30) and/or mounting pads (12), with gas pockets (40) trapped between the solder masses (32)/solder joints (24) and the plugged vias (34). This trapped gas pocket (40) provides additional buoyant force upon the SMD (14) during reflow.
Abstract:
Elektronisches Schaltgerät mit einem Gehäuse (1), einem Anschlusskabel (3) und einer Leiterplatte (2) mit einer elektronischen Schaltung, wobei die Litzen (4) des Anschlusskabels (3) jeweils mit einem auf der Leiterplatte (2) angeordneten und zur Versorgung der elektronischen Schaltung dienenden ersten Kontaktpad (5) verbunden sind, wobei die Litzen (4) des Anschlusskabels (3) erfindungsgemäß jeweils mit einem auf der Leiterplatte (2) angeordneten zweiten Kontaktpad (6) verbunden sind, das von der Elektronikeinheit isoliert ist, näher am Kabeleintritt angeordnet ist, und lediglich der Zugentlastung dient. Außerdem ist ein Verfahren zur Kabelauszugsprüfung angegeben.