摘要:
A pneumatic gross leak detector for testing micro-electronic packages. Thepparatus includes a frame having a vertically movable upper section and a stationary lower section. A chamber is provided with walls which are secured to the upper section for movement therewith. The chamber includes upper, lower and intermediate portions disposed in communication. A test chamber base is secured to the lower stationary section to receive the microelectronic package therein. A first piston is provided in the upper chamber portion for moving the upper frame section downwardly for sealing engagement for the lower chamber portion with the test chamber base. A second piston is provided for compressing air in the lower chamber portion to a predetermined value. A readout device communicates into the test chamber to indicate if compressed air in the lower chamber leaks into the micro-electronic package.
摘要:
A uniquely designed acoustic transducer comprising a stack of piezoceramic elements (other piezoelectric materials may be used) mounted upon a tuned, shaped transmit/receive head made of hardened metal alloy. The ceramic stack is preloaded to the head via a stress bolt. Insulator electrodes used in the ceramic stack are selected to minimize compliance in the stack for maximum efficiency. All the material properties, sizes, weights, etc., as well as the overall transducer design are carefully selected to act in combination to match the impedance of the load (i.e. metal structural framework). The diameter of the tip of the tuned, shaped driving head is sized such that when clamped to a metal framework, the base metal of the material just under the tip is compressed to or slightly beyond its yield point. This eliminates the requirement for surface preparation because any coatings will be displaced under the applied pressure and any surface irregularities will be flattened out. The underside of the clamping member used to hold the transducer assembly in place consists of a half wave length reflecting waveguide designed to reflect any absorbed energy back into the load. Thus, the attachment points for both the reflector and the transducer head of the clamping device effectively appear invisible to the driving transducer under load.
摘要:
Glass lead seal test apparatus in which a multiplicity of microcircuit pages with the leads sealed relative thereto by glass are checked for leakage between the glass seals and the microcircuit package structure and relative to the leads; this is accomplished by providing an apparatus for evacuating a chamber of the microcircuit packages and a chamber of the apparatus, and then injecting helium into the chamber of the apparatus and then utilizing test structure to test leakage around the glass seals if a perfect seal is not present. The device is designed to handle a multiplicity of microcircuit packages during a given test cycle.
摘要:
A device for altering the after body shape of a missile configuration so aso reduce the ballistic flight drag coefficient after booster burnout and including linear shaped charge cutting device for severing a portion of a nozzle exit cone just aft of a fixed boattail configuration on the outer surface of the missile to allow boundary layer air flow to flow smoothly over the boattail and thereby reduce the base drag on the missile during the coast phase thereof.
摘要:
A slider assembly for flying a magnetic head at very low clearances on a fluid film over a moving recording medium. This improved slider assembly provides stability and uniformity of flying height and increased damping characteristics when the slider assembly is subjected to dynamic forces. The slider assembly has, in most embodiments, a pair of rails each having a tapered forward end to provide a converging inlet to achieve the fluid film. Most of the static load is carried by the flat surface of the rails rearward from that tapered forward end. Each rail of the slider assembly has at least one longitudinal transverse pressurization contour (TPC) along corresponding edges of the rails to provide this stability of flying height. When only one TPC per rail is used, the particular edge chosen for the TPC depends upon the disk size and skew angle distribution over the recording zone. The TPC's can be of step construction, a linear taper or a convex configuration. For each, the "average" angle as determined by the height and width of the TPC is about 0.05 to about 5 degrees.
摘要:
Novel organosiloxanes containing units of the formula ##STR1## in which Q represents a divalent group composed of carbon and hydrogen, and optionally oxygen or sulphur, and R represents a monovalent hydrocarbon group, the organosiloxanes also containing at least two silicon-bonded substituents selected from hydrogen atoms, alkoxy groups and alkoxyalkoxy groups. The organosiloxanes can be applied to textile fibres, optionally in conjunction with crosslinking agents and catalysts, to impart thereto resistance to soiling by oily substances.
摘要:
Compositions curable by radiation e.g. UV radiation are disclosed and claimed which comprise an organosiloxane having at least two siloxane units including groups --RSH, an organosiloxane having at least two siloxane units including ethylcyclohexenyl groups, and a photoinitiator. The compositions cure on exposure to UV radiation and may be used to produce on a variety of substrates coatings which are of reduced odor. Also, disclosed and claimed is a method of treating a substrate which comprises applying a coating of such compositions and irradiating the coating. Examples given refer to production of coatings on paper substrates to provide cured coatings.
摘要:
Organosiloxane-oxyalkylene copolymers in which at least one silicon atom of an organosiloxane unit has attached thereto a group ##STR1## in which X is a divalent hydrocarbon group, R is an alkylene group, n is an integer of at least 2, Z is an organic substituent containing an epoxy group, R' is lower alkyl, vinyl or phenyl, R" is alkyl or alkoxyalkyl and a is 0 or 1, at least 40 percent of the total substituents in the copolymer being methyl.The copolymers are film forming and may be applied to continuous or porous substrates from aqueous or non-aqueous solutions.
摘要:
A plurality of fine leak test chambers for fast individual testing of herically plated microelectronic devices. Each microcircuit component, having already been subjected to a controlled environment of 5 percent helium and 95 percent nitrogen and then assembled, is placed in the chambers and sealed therein. The chambers are evacuated and helium flow rate (if present) is measured by a spectrometer.
摘要:
The invention provides an exemplary slider arrangement for supporting read and/or write elements in operative relation to a first and a second side of a flexible moving recording medium. The slider arrangement comprises a first slider having leading edge, a trailing edge and a longitudinal axis therebetween. The first slider comprises a first longitudinal rail and a second longitudinal rail. The first and second longitudinal rails each have a face positioned toward the first side of the recording medium. A second slider is provided having an leading edge, a trailing edge and a longitudinal axis therebetween. The second slider comprises a third longitudinal rail and a fourth longitudinal rail which each have a face positioned toward the second side of the recording medium. The first and second sliders are mounted generally opposite each other with the first rail being generally opposite the third rail and the second rail being generally opposite the fourth rail. Further, the first and fourth rails each include at least one longitudinal slot to partition the first and the fourth rails each into at least two sub-rails. At least one of the sub-rails of the first and the fourth rails houses at least one read and/or write element and has at least one portion which varies in width.