Abstract:
An electronic circuit assembly comprises a substrate and circuit components attached to the substrate by means of an electrically conductive adhesive, wherein the adhesive is releasable under predetermined release conditions, whereby to enable the circuit components to be removed from the substrate for recovery or re-use.
Abstract:
A method of cleaning at least one article having a surface to be cleaned, the method comprising the steps of inserting the article into a cleaning chamber (3), subjecting the surface of the article to treatment with water vapour under conditions such that at least a portion of the water vapour condenses on said surface of the article as condensed water, and introducing an organic solvent into the cleaning chamber (3) and thereby removing the condensed water from the surface of the article, wherein no immersion of the article in water or aqueous solution takes place in the cleaning chamber.
Abstract:
A thermally conductive structure of a light emitting diode (LED) includes a vapor chamber, an insulating layer, an electrically conductive layer and a plurality of LEDs. In the invention, the insulating layer is plated over a surface of the vapor chamber; the electrically conductive layer disposed on the insulating layer is electrically separated from the vapor chamber and has a first electrode and a second electrode; and the LEDs arranged on the insulating layer respectively have a first leg connected to the first electrode and a second leg connected to the second electrode; thereby, the invention has an excellent performance of thermal conduction and heat dissipation, which is capable of prolonging the lifespan of LED.
Abstract:
A method and apparatus for desoldering electronic components from a substrate. A vacuum is used, to enhance the flow of a hot gas under an electronic component to reflow the solder connections attaching the electronic component to a substrate. Water vapor is added to the hot gas to increase the heat capacity of the hot gas. A system for periodically changing the direction of flow of the hot gas and vacuum under the electronic component is used to uniformly heat the solder connections. A method and apparatus for depositing underfill material between an electronic component and the substrate on which the electronic component is mounted. A vacuum is applied to enhance the flow of underfill material into the space between the electronic component and the substrate.
Abstract:
A degreasing and cleaning method for cleaning circuit boards and the like has a first, wash sump containing a boiling, environmentally friendly wash material and a second, rinse, sump containing an environmentally friendly rinse material, separated by a weir. An anti-splash and surge control fence is mounted on top of the weir to control splashing and spill-over between the sumps. The wash sump contains a plurality of spray wands and a programmed hoist pans the carrier of the boards past the spray wands in incremental steps. After the wash cycle, the carrier is introduced into the second, rinse, sump and then given a final vapor rinse. The temperature ranges in which the apparatus is operated yield optimum cleaning.
Abstract:
An object (12) may be cleaned by CO.sub.2 reduced ESD by directing a first water mist (23) at a surface (14) of the object while imparting a relative motion between the object board and the mist to form a film of water on the object surface. As the relative motion is imparted between the board and the first mist (23), a second water mist (32) is injected into a stream (30) of solid CO.sub.2 particles (27) directed at the object surface downstream of the first mist. Water droplets in the second mist in the second mist combine with the CO.sub.2 particles to create carbonic acid that disassociates into charged ions that increase the conductivity of the water film, allowing for increased charge dissipation, thus reducing the incidence of ESD.
Abstract:
A cleaning process and its relative apparatus for cleaning a substance placed in a cleaning space to which superheated steam is supplied and filled thereby making the space under a state of non-oxygen. Greater cleaning effect can be obtained without using any toxic substance.
Abstract:
A vapor phase system for soldering of a workpiece. A vessel for containing an electronic liquid which is heated to generate a zone of saturated vapor. A first inclined throat communicates with the vessel and a solder pot is located within the vessel. The solder pot including a reservoir for containing molten solder, a second throat aligned with the first throat and communicating at one end with molten solder contained in the reservoir means and communicating at the other end with the saturated vapor, molten solder contained in the reservoir means is pumped through the second throat and is captured by the reservoir and a conveyor carries work product through the first throat, through the saturated vapor and into the second throat whereby the work product will become immersed in the molten solder contained within the second throat.
Abstract:
An improved vapor phase soldering process and apparatus are disclosed having particular application to electronic circuitry designed for operation at frequencies higher than 1 MHz. A printed circuit board having a defined circuit pattern on both sides is clamped between two parallel clamping fixtures, one having circuit matching characteristics for the specified PC board, and the fixture further having vents allowing vapor phase gas access to the PC board and soldering process waste gasses egress from the soldering area. This process and apparatus allows shortened soldering time, and improves performance characteristics of the PC board by improving the conduction characteristics of the defined circuit pattern.
Abstract:
A method for creating patterned coatings on a molded article includes providing a molded article which has a surface comprising a first area and a second area, at least one surface property in the first area of the surface being different from that in the second area, applying a coating covering at least the first area and the second area to the surface of the molded article, the adhesion of said coating being greater in the first area than in the second area because of the at least one different surface property, and partially removing the coating by means of a removal process which is applied to the entire coating at a constant removal power that is determined such that the entire coating is removed in the second area while the coating remains in place on an entire surface of the first area.