摘要:
The invention provides a method for preparing a printed circuit board with solder plated circuit and through-holes, using a specifically prepared photoresist material and a combination of exposure, development, solder plating and etching means.This method is particularly useful for the preparation of a printed circuit-board with solder plated circuit and through-holes bearing a high density circuit pattern.
摘要:
A multi-layer printed wiring board in which an internal board has a wiring pattern on both sides. Two conductive plates for establishing respective voltage planes are formed with a pattern of grooves to match the wiring pattern of the internal board. The internal board is then sandwiched to the two sides of the conductive plates, with the grooves registering with the wiring pattern, and with intermediate insulating layers. Further, insulated wiring patterns are formed on the exterior sides of the conductive plates together with through-holes through the assembly.
摘要:
A new phenomenon in integrated circuit etch processing is presented, explained and utilized to permit better removal of layers overlying integrated circuit structures, and if desired, the formation of conductive layers on such structures by a less complicated and lower temperature process than has been possible by conventional techniques.
摘要:
There is described an apparatus for treating objects with a treatment fluid, more especially an etching or developing machine for the production of printed-circuit boards, wherein the nozzle stock comprising a plurality of nozzles is designed so as to be plate-like. The edges of the plate-like nozzle stock are tightly connected to the housing walls so that the treatment chamber, to which the treatment fluid is applied, is bounded by the nozzle stock in one direction. The nozzles can be fitted and possibly also rotated through the nozzle stock from the side that is directed away from the treatment chamber, so that an effortless exchanging or aligning of the nozzles is possible from outside the treatment chamber (FIG. 1).
摘要:
A method for preferentially etching a piezoelectric material is disclosed wherein a portion of the piezoelectric material is controllably subjected to a concentrated thermal energy source with a force sufficient to alter the crystalline orientation of the piezoelectric material. The piezoelectric material is then treated with a suitable echant for a controlled duration, wherein the portion of the piezoelectric material altered by the concentrated thermal energy source is etched at a different etching rate than the unaltered piezoelectric material, to preferentially etch a controlled anaglyphic planar configuration upon the piezoelectric material.
摘要:
An apparatus for the in-situ cleaning of Low Pressure Chemical Vapor Deposition tube chambers (32) or Reduced Pressure Epitaxy bell jar chambers (42) having a base member (22) to create a vacuum seal upon engagement with the loading end of the chamber, at least one powered electrode (62) which protrudes from the base member into the chamber, at least on grounded electrode (60) which also protrudes from the base member into the chamber, a means for introducing gas (92) into the chamber, and an electrical network (16) that creates a radio frequency electrical field between the powered electrode and the grounded electrode. A plasma is created in the chamber by the interaction of the gas and the RF field, and the plasma etches unwanted deposits from the inner wall of the chamber. Several different configurations of electrode structures are shown.
摘要:
An improvement in the process of constructing an integrated circuit structure in which a photoresist layer is applied to an integrated circuit structure followed by plasma etching of the structure is disclosed which comprises exposing the photoresist material to light, preferably UV light, prior to the etching step whereby the surface of the structure beneath the photoresist will be smooth after the etching step and removal of the photoresist.
摘要:
Selective etching of microelectronic devices comprising crystal substratess achieved by electrically masking conductive areas thereon which are not to be etched by ionic bombardment. The electrical masking is accomplished by biasing the selected areas with a bias voltage which will repel the ions, which are attracted to all of the unbiased portions of the microelectronic device.
摘要:
A photolithographic process useful for VLSI fabrication is disclosed for achieving side-wall profile control of poly lines, metal lines, contact and via openings. Layers of a first and second photoresist materials are formed on the poly, metal or oxide-covered substrate. The top layer is patterned by conventional processes to define the final device geometry. The bottom layer is exposed and over-developed to form an overhang structure about the line pattern or the contact/via opening. During the subsequent anisotropic plasma-assisted etching step, some ions or particles are passed obliquely over the overhang and bombard the opening corner, the side-wall and the under-cut area. The plasma-assisted etching step not only forms the poly or metal lines, or the contact or via opening, but also results in an opening with rounded corners and a smoothly tapered side-wall profile. The subsequent metal film deposition step results in a uniform film thickness around the edges of the opening. The process thus alleviates the problem of high contact resistance previously encountered as a result of dry etching the contact or via openings.
摘要:
A composition of matter comprising sulfuric acid and guanidine, aminoguanidine, or formylated aminoguanidine. The composition is useful in the preparation of sulfuric acid/hydrogen peroxide etching solutions and in methods for etching copper, most particularly in the manufacture of printed circuits.