An example system for maintaining the shape of a circuit board includes metal balls that are configured not to collapse in whole or part in response to a force below a predefined force and a temperature below a predefined temperature. The metal balls are configured to support a substrate and are part of electrical connections between the substrate and a circuit board. The system includes a fixture configured to apply force to the substrate while the substrate is subjected to the temperature. The fixture is configured to distribute the force across a surface of the substrate that is not in contact with the metal balls such that the force applied by the fixture and the support of the substrate by the metal balls maintains a shape of the substrate at the temperature.

A method for transferring a micro device on a curved surface according to an exemplary embodiment of the present invention includes: coating an adhesive layer on an external circumferential surface of a tube; providing a micro device pattern on one side of a substrate; positioning an external circumferential surface of the tube to contact the substrate and allow a length direction of the device pattern to cross a radius direction of the tube, and rotating the tube with respect to an axis-direction of the tube and simultaneously moving at least one of the tube and the substrate in a rectilinear way to transfer the micro device pattern on the substrate to the adhesive layer; and fixing the transferred micro device pattern to the adhesive layer by curing the adhesive layer.

The application discloses a pre-press head and an operating method thereof. The pre-press head includes an adsorption unit and a control unit. The adsorption unit includes at least two vacuum adsorption structures each including a gas path and at least one gas hole communicated with the gas path. The control unit is configured to control, according to a size of a to-be-adsorbed object, formation of vacuum environment of each vacuum adsorption structure. The adsorption unit is configured to adsorb the to-be-adsorbed object under the control of the control unit. The solution provided by the application adjusts adsorption functions of the vacuum adsorption structures according to a size of a to-be-adsorbed circuit board, so that the pre-press head can be applicable to circuit boards having different sizes.

In a heat insulating load jig 11 of the present invention, a solder material 14 having a melting point or a solidus temperature in a range between a thermal resistance temperature of a semiconductor chip 13 and a temperature 100 C. below the thermal resistance temperature is interposed between a circuit board 12 and the semiconductor chip 13; a heat insulating body 17 is placed on an upper side of the semiconductor chip 13 in this state; a metal weight 16 is disposed on the heat insulating body 17; and load is applied to the semiconductor chip 13 while the solder material 14 is melted and solidified.

Embodiments relate to an apparatus for rework of a BGA package. Memory shape material is placed adjacent to a plurality of solder joints of the package. Stimulation is applied to the material, with the stimulation causing the material to change from a non-stimulated shape to a stimulated shape. This stimulation causes an expansion of the material. As the material expands, it exerts a tensile force on the BGA package and an adjacently positioned carrier, causing a separation of the two components, while mitigating collateral heat of adjacently positioned components.

A method of manufacturing a conductive layer on a support body includes a first process of forming a precursor layer containing at least one of metal particles and metal oxide particles on the support body; a second process of forming a sintering layer by irradiating an electromagnetic wave pulse on the precursor layer; and a third process of compressing the sintering layer. The conductive layer is formed by repeating the first to third processes N times, where N denotes a natural number equal to or greater than 2, on the same location of the support body, and the third process performed in the first to (N1)th operations includes forming a surface of the sintering layer in an uneven shape.

A process for improving the performance of the sliding rheostat of 5G communication high-frequency signal board with the sliding rheostat slides along between two bonding pads, includes the following steps: outer layer etching; resin plugging: a. plugging the resinous ink into the pre-plugging position; b: baking, baking on the baking plate of the oven after the plugging is finished: board polishing: using a ceramic brush to process the plugged board, then using a non-woven fabric blush to polish the surface that is polished by ceramic brush. The present invention provides a process for improving the performance of the sliding rheostat of 5G communication high-frequency signal board. The resin plugging method is used to plug the gap between the conductors of the sliding rheostat, so as to prevent the sliding rheostat from being unable to slide due to the altitude difference between conductors of the high-frequency signal board.

A method of masking a feature of a substrate using a fixture includes removably coupling a fixture to a first side of the feature of the substrate, the fixture including walls configured to abut sides of the feature and extend beyond a top surface of the feature when the fixture is removably coupled to the first side. The method further includes applying a masking material to the top surface of the feature. The method further includes removably coupling the fixture to a second side of the feature, the second side opposing the first side, the walls of the fixture configured to abut the sides of the feature and extend beyond a bottom surface of the feature when the fixture is removably coupled to the second side. The method further includes applying the masking material to the bottom surface of the feature while the fixture is removably coupled.

A system is provided for installing a heatsink onto a circuit board. The heatsink has a base, a first hook and a second hook. The system includes a heatsink holder, a circuit board arm, a heatsink pusher, and a hook pusher. The heatsink holder is operable to receive the heatsink. The circuit board arm is operable to move the circuit board onto the heatsink received on the heatsink holder such that the bottom surface of the heatsink is adjacent to the circuit board. The heatsink pusher is operable to move the heatsink holder in a first direction so as to move the first hook relative to the first catch. The hook pusher is operable to push the first hook in a direction normal to the base from the top surface to the bottom surface.

This invention provides a method and apparatus for manufacturing electronic devices. The method includes: providing a substrate having a first surface; providing an electronic device having bumps; mounting the bumps to the first surface to form an integrated unit; applying a capillary underfill to multiple sides of the electronic device, enabling the underfill to creep along and fill the gap between the electronic device and the substrate; placing the integrated unit into a processing chamber; raising the temperature in the chamber to a first predetermined temperature; reducing the pressure in the chamber to a first predetermined pressure of a vacuum pressure, and maintaining the vacuum pressure for a predetermined time period; raising the pressure in the chamber to a second predetermined pressure higher than 1 atm, and maintaining the second predetermined pressure for a predetermined time period; and adjusting the temperature in the chamber to a second predetermined temperature.