Abstract:
A wired circuit board has a plurality of insulating layers (2), a conductive layer (3) having a signal wiring (4) extending in a longitudinal direction which is covered with the insulating layers, and a signal connecting terminal (5A,5B) provided on a longitudinal end of the signal wiring and exposed from the insulating layers, and a ground layer (6) having a ground wiring covered with the insulating layers and formed to surround the signal wiring (15,13) in a perpendicular direction to the longitudinal direction, and a ground connecting terminal (8) provided on a longitudinal end of the ground wiring (14,7) and exposed from the insulating layers. The signal connecting terminal and the ground connecting terminal are formed on an upper surface of the same insulating layer among the plurality of the insulating layers.
Abstract:
A ceramic multilayer board which prevents nonuniform deformation without adding a special process. A plurality of stacked ceramic layers and at least one conductor pattern (13, 14) arranged on at least one ceramic layer are provided, and a cavity (12) is formed at least on a first main plane (10a). At least one ceramic layer having an opening which forms the cavity (12) is provided with a deformation preventing pattern (15) which is arranged to surround the entire circumference of the opening and is made of a same material as that of the conductor pattern.
Abstract:
This invention provides a solder ball loading apparatus which enables fine solder balls to be loaded on pads while void is blocked from being caught into bump upon reflow. Inactive gas is supplied and the inactive gas is sucked from a loading cylinder located above a ball arrangement mask so as to gather solder balls. The gathered solder balls are rolled on the ball arrangement mask by moving the loading cylinder horizontally and the solder balls are dropped onto connecting pads on a multilayer printed wiring board through openings in the ball arrangement mask. Oxidation of the solder balls and mixture of voids upon reflow are prevented by loading the solder balls in the atmosphere of inactive gas.
Abstract:
A method and apparatus for testing unpackaged semiconductor dice includes a mother board (10) and a plurality of interconnects (12) mounted on the mother board (10) and adapted to establish a temporary electrical connection with the dice (14). The interconnects (12) can be formed with a silicon substrate (20) and raised contact members (16) for contacting the bond pads (22) of a die (14). Alternately the interconnects (16) can be formed with micro bump contact members (16) mounted on an insulating film (74). The mother board (10) allows each die (14) to be tested separately for speed and functionality and to also be burn-in tested in parallel using standard burn-in ovens. In an alternate embodiment testing is performed using a mother board/daughter board arrangement. Each daughter board (82) includes interconnects (12) that allow the dice (14) to be tested individually for speed and functionality. Multiple daughter boards (82) can then be mounted to the mother board (10) for burn-in testing using standard burn-in ovens.
Abstract:
In a flex-rigid wiring board in which a rigid substrate formed from a rigid base material and a flexible substrate formed from a flexible base material are stack-joined and electrically connected to each other, the flexible substrate including a conductive layer having interconnecting electrode pads provided on at least one surface thereof, and the rigid substrate including a conductive layer having interconnecting electrode pads provided on at least one surface thereof in a position opposite to the interconnecting electrode pads on the rigid substrate, are locally connected electrically to each other with an anisotropic conductive adhesive layer interposed between conductive layers of substrate portions each including at least the interconnecting electrode pads. In this flex-rigid wiring board, transmission of high-frequency signals can be prevented from being delayed, noises can be suppressed, and an excellent electrical connection and connection reliability be assured.
Abstract:
A method of making an inkjet printhead for surface mounting comprises providing a substrate (10) having a plurality of ink ejection elements and a plurality of electrical contacts (18) formed on a first surface, the contacts being connected to the ink ejection elements to allow selective energisation of the elements. A plurality of through-holes (26) are formed in the substrate each extending from the opposite surface of the substrate fully through the thickness of the substrate to meet the underside of a respective electrical contact (18) on the first surface. Each through-hole is substantially completely filled with a conductive material (36) by electroplating. Finally, a further plurality of electrical contacts (solder mounds) (38) are provided on the second surface of the substrate each in contact with the conductive material in a respective through-hole.
Abstract:
A printed wiring board comprising a circuit board (6) having a conductor circuit (5) and a through-hole (60), and a junction pin (1) inserted in the through-hole. The junction pin is made of a material which does not melt at a heating temperature in joining the junction pin to a counterpart pad (81). The junction pin includes a junction top portion (11) which is greater than the aperture diameter of the through-hole and becomes a junction part with the counterpart pad, and a leg portion (12) of a size enabling insertion into the through-hole. The leg portion is inserted in the through-hole and joined with the through-hole by a conductive material such as a solder material (20). In place of the junction pin, a junction ball of a substantially spherical shape may be joined by the conductive material.