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    1.
    发明专利
    未知

    公开(公告)号：DE2842755A1

    公开(公告)日：1979-04-12

    申请号：DE2842755

    申请日：1978-09-30

    Applicant: IBM

    Inventor： GIORDANO FRANCIS PETER ,  KUHN LAWRENCE ,  LANE RAMON ,  LEE CHEN-HSIUNG ,  ZIERDT GENE OVERHOLTS ,  SAN JOSE CALIF

    IPC: B41J2/02 ,  B41J2/025 ,  B41J3/04

    Abstract: An ink jet printing head comprising a head body made from a material having high specific stiffness and the head body includes an ink passage which is kept small to retain the high body stiffness. The ink passage comprises a narrow slot connected with internal holes in the body which lead to ink inlet and exit ports. A nozzle plate having a plurality of orifices is fixed to the front of the head body and a piezoelectric crystal is fixed to the back of the head body. The piezoelectric crystal is kept thin compared to the head thickness, typically on the order of 1/20 to 1/30 of the body thickness, so that the effect of the crystal on the resonant characteristics of the assembly is kept small. The ink jet head provides a plurality of columns or jets of ink which are excited in such a way as to break up into uniformly and equally spaced drops at a fixed distance from the nozzle plate containing the orifices which produce the jets.

    2.
    发明专利
    未知

    公开(公告)号：DE2437094A1

    公开(公告)日：1975-03-20

    申请号：DE2437094

    申请日：1974-08-01

    Applicant: IBM

    Inventor： CHILDERS WILLIAM WALTER ,  ELSER KARL HEINZ ,  SAN JOSE CALIF ,  PETERSON PHILLIP JOHN

    IPC: G11B5/03 ,  G11B5/127 ,  G11B5/133 ,  G11B5/265 ,  G11B5/14

    Abstract: A magnetic head assembly for cooperating with a relatively moving magnetic medium and for reading and/or writing one or several tracks of magnetic information and for erasing the edges and old information adjacent the edges of the newly written track after it is written and the method for making the assembly is disclosed. The assembly comprises three similarly shaped layers; a middle layer of substantially constant width including a read/write magnetic core and a first non-magnetic spacer integrally secured thereto, a pair of outer layers secured against the sides of the middle layer in a sandwiched structure, each of the outer layers comprising an erase magnetic core having an end leg portion and a second non-magnetic spacer integrally secured to the erase core, the outer layers aligned similarly with respect to each other and opposite to the middle layer such that the second non-magnetic spacers contact the magnetic read/write core of the first layer, and a single erase coil disposed over respective end legs of the pair of erase cores.

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