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公开(公告)号：CA1127702A
公开(公告)日：1982-07-13
申请号：CA326060
申请日：1979-04-19
Applicant: IBM
Inventor： HOFFMAN ARTHUR R , LAMMERS GERALD B
Abstract: A charge electrode array for à muiti-nozzle ink jet array is fabricated from alternate layers of stainless steel and epoxy resin. The charge electrode array may be formed by positioning stainless steel tabs in previously grooved nonconductive substrate such as ceramic. The grooves are spaced sufficiently apart to allow insulating material to be placed between each stainless steel tab. Alternatively, a stainless steel plate may be bonded to a nonconductive subtract. Then the stainless steel can be sliced so that insulating material can be placed between each stainless steel strip. Epoxy fills the gap between tabs or strips forming an insulating layer, An ink drop charging channel through each tab or strip is formed by drilling through the tips of the steel tab- or strips or by cutting U-shaped channels through the tips- of the tabs or strips
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公开(公告)号：CA1312772C
公开(公告)日：1993-01-19
申请号：CA588788
申请日：1989-01-20
Applicant: IBM
Inventor： HOFFMAN ARTHUR R
Abstract: While present-day ink jet: print heads are operable technically, they are too inconsistent and unreliable, and none has remained operational for as long as one year. The disclosure describes three structural improvements to these present-day ink jet print heads, any one of which offers a dramatic improvement over present-day head structures. However, if all three improvements described in the disclosure are included in the same print head, as high performance as 100% is available from those produced. The first improvement described relates to the gasket between the ink reservoir, with its nozzle plate attached, and the drop generator body that encloses the dynamic pressure transducer. If this gasket is formed of very soft material, having a durometer value in the order of 60, then it is only necessary to clamp the plate to the drop generator body with sufficient torque to seat and seal the ink reservoir to prevent ink leakage. The second improvement described requires a small space between each crystal in a piezoelectric transducer and the washer of acoustic-absorbing material, and the third improvement involves the support rod for these crystals. The support rod should fit with sufficient frictional force to retain the crystals in a preset position, avoiding all unnecessary extra loading of the crystals.
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Patent Agency Ranking
公开(公告)号：CA1129935A
公开(公告)日：1982-08-17
申请号：CA336998
申请日：1979-10-04
Applicant: IBM
Inventor： FILLMORE GARY L , HOFFMAN ARTHUR R , YOUNG THOMAS
Abstract: INK JET HEAD An inner cylindrical tube has its outer cylindrical surface spaced from an inner cylindrical surface of outer means to have an ink cavity therebetween from which ink is supplied through one or more ink jet nozzles. At least the inner tube is a piezoelectric material so that the inner tube vibrates radially when electrically excited to produce vibrations at a desired operating frequency whereby a stream of ink droplets is supplied from each of the ink jet nozzles. The spacing between the inner surface, which has its longitudinal axis coaxial with the longitudinal axis of the inner cylindrical tube, of the outer means and the outer surface of the inner cylindrical tube is selected so that the ink cavity is resonant at the operating frequency of the inner cylindrical tube. To maintain the lowest frequencies of perturbations in the axial direction of the inner cylindrical tube substantially greater than the operating frequency, the inner cylindrical tube can be formed of a plurality of longitudinal segments acoustically isolated from each other in the axial direction. In another form, the outer means is a body formed with a membrane providing acoustical communication from a liquid cavity between the inner tube and the body and each BO978011 ink cavity, which has ink jet nozzles at its end. The liquid cavity preferably has a liquid of substantially the same density as the ink. This enables each of the ink cavities to have a different colored ink if desired. BO978011
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公开(公告)号：FR2412408A1
公开(公告)日：1979-07-20
申请号：FR7832876
申请日：1978-11-16
Applicant: IBM
Inventor： HOFFMAN ARTHUR R
Abstract: A multi-nozzle ink jet array has all of the nozzles arranged in a single plane with each of the nozzles having a longitudinal passage extending therethrough of the same diameter. The lengths of the longitudinal passages of the nozzles at each end of the array are shorter than those in the center of the array to cause an increased initial velocity of the ink jet streams flowing therefrom so as to compensate for aerodynamic drag on the end streams.
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公开(公告)号：CA1114002A
公开(公告)日：1981-12-08
申请号：CA309375
申请日：1978-08-15
Applicant: IBM
Inventor： HOFFMAN ARTHUR R
Abstract: COMPENSATION FOR AERODYNAMIC DRAG ON INK STREAMS FROM A MULTI-NOZZLE INK ARRAY A multi-nozzle ink jet array has all of the nozzles arranged in a single plane with each of the nozzles having a longitudinal passage extending therethrough of the same diameter. The lengths of the longitudinal passages of the nozzles at each end of the array are shorter than those in the center of the array to cause an increased initial velocity of the ink jet streams flowing therefrom so as to compensate for aerodynamic drag on the end streams.
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公开(公告)号：CA1102137A
公开(公告)日：1981-06-02
申请号：CA267509
申请日：1976-12-09
Applicant: IBM
Inventor： HOFFMAN ARTHUR R , KENDALL ARTHUR H , ROHR ROBERT L
Abstract: Multiple nozzle arrays are formed from an assembly of at least one pair of plates having intersecting channels for receiving orifice clements and sealant. In the preferred assembly, one plate has a single channel for carrying a plurality of orifice elements and a plurality of deeper, parallel cross-channels for carrying the sealant, and the other plate has a similar set of sealant-carrying cross-channels that connect when the plates are joined. In another embodiment only one plate is machined with intersecting channels of different depth, the shallow channels for carrying the orifice elements and the deep channels for carrying the sealant, the second plate serving only as a cover. The joined plates, with inserted orifice elements and sealant, are then mounted vertically (preferred embodiment) or at an appropriate angle and exposed to a temperature sufficient to cause the sealant alone to melt and to flow by capillary and gravity action to seal the orifice elements in a void-and-bubble free manner and to seal the plates to form a plate block. After gradual cooling, the plate block is sliced into multiple nozzle wafers, which are then lapped and polished and mounted on a back-up plate for attachment to a source of high pressure fluid.
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公开(公告)号：FR2334500A1
公开(公告)日：1977-07-08
申请号：FR7634518
申请日：1976-11-08
Applicant: IBM
Inventor： HOFFMAN ARTHUR R , KENDALL ARTHUR H , ROHR ROBERT L
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