摘要:
A method and apparatus for underfilling a gap between a multi-sided die and a substrate with an encapsulant material. The die and/or the substrate is heated non-uniformly by a heat source to generate a temperature gradient therein. The heated one of the die and the substrate transfers heat energy in proportion to the temperature gradient to the encapsulant material moving in the gap. The differential heat transfer steers, guides or otherwise directs the movement of the encapsulant material in the gap. The temperature gradient may be established with heat transferred from the heat source to the die and/or the substrate by conduction, convection, or radiation. The temperature gradient may be dynamically varied as the encapsulant material moves into the gap.
摘要:
A method and apparatus for underfilling a gap between a multi-sided die and a substrate with an encapsulant material. The die and/or the substrate is heated non-uniformly by a heat source to generate a temperature gradient therein. The heated one of the die and the substrate transfers heat energy in proportion to the temperature gradient to the encapsulant material moving in the gap. The differential heat transfer steers, guides or otherwise directs the movement of the encapsulant material in the gap. The temperature gradient may be established with heat transferred from the heat source to the die and/or the substrate by conduction, convection, or radiation. The temperature gradient may be dynamically varied as the encapsulant material moves into the gap.
摘要:
A jetting dispenser has a dispenser body with a fluid channel and a fluid channel outlet within the fluid channel. A valve member is movable within the fluid channel for selective contact with a valve seat near the fluid channel outlet. A jetting nozzle is adapted to be coupled to the dispenser body, adjacent the channel outlet, and has a nozzle body with a plurality of nozzle outlets in fluid communication with the channel outlet via a plurality of fluid passages through the nozzle body. The valve member is moved by a valve driver to contact the valve seat and impart momentum to liquid material supplied to the dispenser such that a plurality of droplets of liquid material are simultaneously jetted from the plurality of nozzle outlets.
摘要:
A method of noncontact dispensing is provided for conformal coating applications by jetting a viscous material onto a substrate. Dispensing by a jetting process results in small wetted areas thus providing highly discrete and selective conformal coating capabilities. Enhanced selectivity permits the coating of small areas and geometries and provides excellent edge definition between coated and uncoated areas.
摘要:
A method is provided for forming at least one continuous line of viscous material between two components of an electronic assembly forming two substrates. The method includes the steps of depositing a plurality of spaced apart dots of the viscous material onto a surface of a first one of the substrates and bringing a second one of the substrates into contact with the dots causing the dots to merge together to form at least one continuous line of the viscous material between the two substrates.
摘要:
A method of noncontact dispensing a viscous material onto a surface of a substrate, which uses a jetting valve having a nozzle directing the viscous material flow in a jetting direction nonperpendicular to the surface of the substrate. The nonperpendicular jetting direction results in the droplet producing a reduced wetted area on the substrate.
摘要:
Systems and methods for dispensing or jetting a viscous material. The systems include an electronic controller and a jetting dispenser operatively coupled with the electronic controller. The systems further include at least one sensor that senses a system dispensing parameter and communicates an output signal representing the sensed parameter to the electronic controller for controlling system operation. In pneumatically-actuated jetting dispensers, a sensor may sense the fluid pressure in the air cavity of the pneumatic actuator. In jetting dispensers with a movable needle valve, a sensor may sense the displacement of the needle shaft. In other jetting dispensers, a sensor may sense the vibration of the jetting dispenser.
摘要:
Apparatus and methods for preapplying discrete amounts of underfill material of a component on a component substrate before the solder bumps of the component are joined by reflow with a packaging substrate to create a microelectronics package. The underfill material is preferably applied by a noncontact dispensing technique as discrete amounts at interstitial areas on an active surface of the component substrate defined between nearest-neighbor solder bumps. The underfill material forms a continuous meniscus of underfill material across the interstitial areas not occupied by the solder bumps and forms a collar encircling each of the solder bumps. The cured underfill material strengthens and improves the reliability of the solder joints formed by the bump reflow.
摘要:
The present disclosure discloses a fixed connection of an operating space frame of a machine, comprising: a machine frame; an operating space frame mounted on the machine frame and having a plurality of posts, wherein a first connecting plate is fixedly connected respectively at a lower portion of at least two adjacent posts, the first mounting plate is fixedly connected to the machine frame via a connecting member, and a stopper is provided between the first mounting plate and the machine frame. The fixed connection improves the connection strength between the operating space frame and the machine so as to suppress deformation of the operating space frame subjected to an impact of an external force and thus provide protection for the operator and equipments therein. The present disclosure further relates to a machine having the above fixed connection.
摘要:
The present invention discloses a nanophase carbon black grafted with organic compounds, comprising (a) a first component: 100 parts by weight of original carbon black particles, and (b) a second component: 5-300 parts by weight of grafting organic compounds having or producing free radicals which is grafted onto the surface of the carbon black, wherein the molecular weight of the grafting organic compounds is 100-10000, and the nanophase carbon black has a particle size of 1-100 nm. The invention also discloses the synthesis thereof and articles therefrom.