摘要:
A system for fluid dispensing control includes a fluid dispensing control device, a fluid dispenser, and a fluid flow meter, such that an intelligent parameterization of the dispensing system includes process variables, which characterize system behavior. The parameterization is used in convergence schemes for attaining defined fluid dispensing targets. Further, the parameterization is used to attain a consistent volumetric fluid dispensing by utilizing feedback controls. A fluid dispensing device includes a processor, a non-transitory memory, an input/output, a dispensing controller, a flow monitor, a parameterization manager, and a data bus. Also disclosed is a method for fluid dispensing control, including: a parameter sweep, logging system response data, processing response data, calculating system response function, calculating dispensing parameters, assessing intrinsic variation, determining variation band, controlling fluid dispense process response, and normalizing mass/volume fluid flow.
摘要:
An automated system (10) and methods (11) for priming a fluid chamber (12) of a fluid dispensing valve (14) with fluid (16) from fluid material source that includes a vacuum source (46), a valve priming station (32), a vacuum switch (54), and a controller (62). The valve priming station (32) has a boot (40), a vacuum chamber (36), and a vacuum channel (42) in the boot (40). The vacuum channel (42) connects with the vacuum source (46) via the vacuum chamber (36). The boot (40) sealingly engages a valve nozzle (28) of the fluid dispensing valve (14) so that the vacuum chamber (36) connects the vacuum source (46) with the fluid chamber (12). The vacuum switch (54) couples with the vacuum channel (42) via the vacuum chamber (36) and has an opened and closed position based upon a vacuum level in the vacuum chamber (36). The controller (62) is electrically connected with the vacuum source (46) and vacuum switch (54) and controls priming of the fluid dispensing valve (14) based upon whether the vacuum switch (54) is opened or closed.
摘要:
A method of controlling edge definition of viscous material applied to an application area on a substrate comprises dispensing a row of droplets of the viscous material onto the application area with a dispensing apparatus. While moving relative to the substrate along a path proximate the row of droplets, the dispensing apparatus dispenses a fan spray pattern of the viscous material. At least some of the viscous material dispensed in the fan spray pattern impinges and mixes with the row of droplets to define an edge of the fan spray pattern.
摘要:
Methods for applying fluid materials to a substrate, such as circuit board, while continuously moving the fluid dispenser. Some methods generally involve correcting the dispense location for each of the dispensed amounts of fluid material by executing a statistical comparison of either the predicted and actual landing locations on the substrate, or the predicted and actual positions of the dispenser at each of the dispense locations. Other methods generally involve initiating the dispensing of amounts of the fluid material at dispense locations corrected by a correction factor specified in terms of the servo cycle for the movement of the dispenser or by a correction factor specified in terms of partial servo cycles courtesy of a timer.
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:
Solder compositions are introduced to interface between an IC chip and its associated heat exchanger cover. The solder compositions have a solidus-liquidus temperature range that encompasses the IC chip operational temperature range. The solder composition has the desired property of absorbing and rejecting heat energy by changing state or phase with each temperature rise and decline that result from temperature fluctuations associated with the thermal cycles of the integrated circuit chips. The electronic module cover is a cap with a heat exchanger formed or attached as a single construction, and made of the same material as the substrate, or made with materials of compatible thermal coefficients of expansion to mitigate the effects of vertical displacement during thermal cycling. The cap-heat exchanger cover is constructed to be compliant, and to contact both the IC chip and substrate in order to provide, in conjunction with the solder composition, a path of high thermal conduction (low thermal resistance) from the IC chip to the heat exchanger to the ambient air.
摘要:
A heat sink in a heat transfer relationship with a substrate such as an integrated chip, chip carrier, or other electronic package. The heat sink is connected to a frame which is connected to a printed circuit board or other suitable support on which the substrate is positioned. The heat sink, which extends through an aperture in the frame is coupled to a surface of the substrate. The heat sink is mechanically decoupled from the substrate. Large heat sinks may be thermally connected to surface mount substrates mounted using technologies such as ceramic ball or column grid arrays, plastic ball or column grid arrays, or solder balls or columns. The heat sink is attached coaxially through the aperture to the substrate. After assembly and lead/tin or other metallic surface mount interconnects are relaxed such that the substrate and is completely supported by the frame and the heat sink imparts zero or nearly zero downward force. Because the heat sink moves freely within the aperture during assembly, the heat sink package is useful for a variety of different substrates. Preferably, the frame is a plate and a plurality of studs. The plate material are selected to match the thermal expansion of the underlying support, and the stud material matched the thermal expansion of the substrate. Thus, the frame construction allows matching expansion and contraction of the assembly to the underlying substrate and support.
摘要:
A system for fluid dispensing control includes a fluid dispensing control device, a fluid dispenser, and a fluid flow meter, such that an intelligent parameterization of the dispensing system includes process variables, which characterize system behavior. The parameterization is used in convergence schemes for attaining defined fluid dispensing targets. Further, the parameterization is used to attain a consistent volumetric fluid dispensing by utilizing feedback controls. A fluid dispensing device includes a processor, a non-transitory memory, an input/output, a dispensing controller, a flow monitor, a parameterization manager, and a data bus. Also disclosed is a method for fluid dispensing control, including: a parameter sweep, logging system response data, processing response data, calculating system response function, calculating dispensing parameters, assessing intrinsic variation, determining variation band, controlling fluid dispense process response, and normalizing mass/volume fluid flow.
摘要:
An improved pneumatic jetting valve includes a housing with first and second chambers. A pneumatic piston is enclosed between the chambers. First and second solenoid valves are configured to respectively supply air pressure to the chambers and to exhaust the chambers. A controller is operable to regulate the pressurization and venting of the chambers. The controller controls the timing of control signals for the first and second solenoid valves to control the overlap time during which both the first and second chambers are pressurized. By controlling this overlap time, the controller controls the speed of the drive pin of the jetting valve and thereby the speed at which the valve closes to jet a droplet of material. This allows a valve speed to be selected that is most appropriate for the viscosity of the material being jetted. Numerous new methods for utilizing the improved jetting valve and system are disclosed.