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IBM Journal of Research and Development

Issue 4 • Date July 1979

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Displaying Results 1 - 17 of 17
  • Guest Editorial

    Publication Year: 1979, Page(s): 360
    IEEE is not the copyright holder of this material | PDF file iconPDF (106 KB)
    Freely Available from IEEE
  • Air Film System for Handling Semiconductor Wafers

    Publication Year: 1979, Page(s):361 - 375
    Cited by:  Papers (4)  |  Patents (16)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1242 KB)

    In an automated fabrication facility, the thin, fragile silicon wafers in which semiconductor circuits are formed must be transported to and from processing stations with a minimum of contact with other solid objects so as to minimize damage, contamination, and consequent lowering of product yield. This task has been undertaken for some time now, in IBM and elsewhere, by systems based on a lubrica... View full abstract»

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  • Micromechanical Membrane Switches on Silicon

    Publication Year: 1979, Page(s):376 - 385
    Cited by:  Papers (91)  |  Patents (94)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (995 KB)

    A new class of electronic devices, micromechanical membrane switches, has been developed. These switches have operating characteristics that fill the gap between conventional silicon transistors and mechanical electromagnetic relays. Although they are batch fabricated on silicon using conventional photolithographic and integrated circuit processing techniques, their unique properties allow them to... View full abstract»

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  • An Application of Beam Dynamics to a Damper Design

    Publication Year: 1979, Page(s):386 - 391
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (401 KB)

    Flexural wave propagation may be used as a means of absorbing impact energy to prevent excessive rebound or to shorten the cycle time of high-speed printing devices. For optimal damping action, however, the dynamic analysis of beams used in the mechanism is necessary; this paper presents such an analysis. It also presents an application of a damper ring design that is used to prevent so-called &#x... View full abstract»

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  • Interposer for Disk Printer

    Publication Year: 1979, Page(s):392 - 395
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (333 KB)

    In an impact printer which selects characters by having a hammer hit type elements as they travel at constant velocity past the print location, a significant design problem results from the requirement that the hammer hit only the selected character. In the usual configuration this requirement limits printing speed because the hammer penetrates the plane of the moving type elements and spends a su... View full abstract»

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  • A Cylindrical Print Element System for a Serial Impact Printer

    Publication Year: 1979, Page(s):396 - 402
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (443 KB)

    For an impact serial printer, like a typewriter terminal, it is desirable to print fast and to print with a minimum of maintenance. For printing to take place, the carrier containing the print element must be in the correct position along the print line and the character selection must be made by the proper positioning of the print element. This paper discusses a cylindrical thin-walled print elem... View full abstract»

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  • Dynamic Response of a Print Belt System

    Publication Year: 1979, Page(s):403 - 410
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (552 KB)

    The dynamic response of a print belt system, when the print belt is subjected to impulsive print forces, is analyzed in this paper. The system consists of a flat steel print belt tightly wrapped around pulleys with one of the pulleys driven by a motor. Analytical modeling allows the prediction and analysis of belt motion and thus the prediction of print misregistration. Discrete parameters used in... View full abstract»

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  • Harmonic-Drive Ribbon Stuffer for Impact Printers

    Publication Year: 1979, Page(s):411 - 414
    Cited by:  Patents (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (287 KB)

    This paper describes a harmonic-motion ribbon-stuffing device for impact printers, which maintains a consistent placement pattern for large-capacity (120 yards) endless-loop fabric ribbons. The ribbon is uniformly placed into a cavity by eccentric drive rolls that ensure alternate ribbon switching due to the geometric relationship of drive rolls and strippers. The ribbon is positively placed in a ... View full abstract»

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  • Document Scanner Mechanism

    Publication Year: 1979, Page(s):415 - 423
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (592 KB)

    A document scanner mechanism, developed for use in a conventional copier having mirrors which scan a document and reflect the image onto a rotating photoconductor drum, is described in this paper. The engineering design and operation of the mechanism are presented, and the development of an analytical model for simulating its operational characteristics is described, together with the results and ... View full abstract»

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  • Planning and Execution of Straight Line Manipulator Trajectories

    Publication Year: 1979, Page(s):424 - 436
    Cited by:  Papers (75)  |  Patents (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (858 KB)

    Recently developed manipulator control languages typically specify motions as sequences of points through which a tool affixed to the end of the manipulator is to pass. The effectiveness of such motion specification formalisms is greatly increased if the tool moves in a straight line between the user-specified points. This paper describes two methods for achieving such straight line motions. The f... View full abstract»

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  • A Numerical and Experimental Study of the Bistable-Unstable Transition in Pressurized Flexible Disk Files

    Publication Year: 1979, Page(s):437 - 449
    Cited by:  Patents (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (963 KB)

    The bistable operating region of flexible disk files is limited at decreasing air flow rates by a transition at which undesirable gaps appear in the otherwise uniformly spaced disks of the pack. These spontaneous gaps, as opposed to the externally controlled gaps of the bistable range, are a consequence of local air flow fields at the outer edge of the disks. Experiments with external shrouds of v... View full abstract»

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  • Experimental Determination of Creep Functions for Thin Orthotropic Polymer Films

    Publication Year: 1979, Page(s):450 - 458
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (762 KB)

    Stringent requirements on the dimensional stability of polymer films used as substrates for magnetic recording make it necessary to experimentally determine their anisotropic viscoelastic behavior. This paper deals with the measurement of the time-dependent, longitudinal elongation and lateral contraction of 50 × 900-mm biaxially oriented orthotropic polyethylene terephthalate (PET) strips.... View full abstract»

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  • Tunnels in Semiconductor Epitaxy

    Publication Year: 1979, Page(s):459 - 461
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (247 KB)

    On (100) surfaces of III–V or II–VI compounds, tunnels or grooves can be grown over oxide or Mo stripes, the axes of which are in one of the two orthogonal 〈110〉 directions on the surface. One 〈110〉 direction produces grooves and the other, tunnels. By switching from n- to p-type layers at frequent intervals during growth, the mechanism can be elucidated. View full abstract»

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  • Recent papers by IBM authors

    Publication Year: 1979, Page(s):462 - 466
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (486 KB)

    Reprints of the papers listed here may usually be obtained by writing directly to the authors. The authors' IBM divisions are idenfied as follows: CHQ is Corporate Headquarters; DPD, Data Processing Division; DSD, Data Systems Division; FED, Field Engineering Division; FSD, Federal Systems Division; GPD, General Products Division; GSD, General Systems Division; OPD, Office Products Division; RES, ... View full abstract»

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  • Recent IBM patents

    Publication Year: 1979, Page(s):467 - 470
    IEEE is not the copyright holder of this material | PDF file iconPDF (271 KB)
    Freely Available from IEEE
  • Authors

    Publication Year: 1979, Page(s):471 - 473
    IEEE is not the copyright holder of this material | PDF file iconPDF (213 KB)
    Freely Available from IEEE
  • Errata [Erratum]

    Publication Year: 1979, Page(s): 474
    IEEE is not the copyright holder of this material | PDF file iconPDF (63 KB)
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Aims & Scope

The IBM Journal of Research and Development is a peer-reviewed technical journal, published bimonthly, which features the work of authors in the science, technology and engineering of information systems.

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Meet Our Editors

Editor-in-Chief
Clifford A. Pickover
IBM T. J. Watson Research Center