公开(公告)号：DE3367295D1

公开(公告)日：1986-12-04

申请号：DE3367295

申请日：1983-06-29

Applicant: IBM

Inventor： HOMOLA ANDREW MARIAN ,  LORENZ MAX RUDOLPH ,  SUSSNER HEINRICH

IPC: G11B5/712 ,  C09D5/23 ,  C09D7/12 ,  G11B5/82 ,  G11B5/84 ,  G11B5/842 ,  H01F41/16 ,  H01F41/24

Abstract: A monolayer magnetic coating is prepared by applying magnetic particles which have an electrostatic charge in an aqueous environment to an active layer on a substrate, the active layer having an electrostatic charge in an aqueous environment opposite to the charge on the magnetic particles so that the particles bond to the active layer. The magnetic particles are dispersed in an electrolyte (eg Na Cl) and the concentration of the electrolyte is adjusted to reduce the coulombic repulsive forces between the particles, permitting them to move closer together and thereby increasing the magnetic particle packing density in the resultant magnetic coating.

公开(公告)号：DE3261588D1

公开(公告)日：1985-01-31

申请号：DE3261588

申请日：1982-03-25

Applicant: IBM

Inventor： BRUCE CALVIN ARNOLD ,  HOMOLA ANDREW MARIAN ,  LORENZ MAX RUDOLPH

IPC: G11B5/84 ,  G11B5/842 ,  H01F41/16 ,  G11B5/70 ,  H01F1/37

Abstract: A monolayer magnetic coating is prepared by applying magnetic particles which have an electrostatic charge in an aqueous environment to an active layer on a substrate, the active layer having an electrostatic charge in an aqueous environment opposite to the charge on the magnetic particles so that the particles bond to the active layer.A method of applying a magnetic coating to a disc substrate is disclosed comprising coating the substrate with an active coating material having an electrostatic charge in an aqueous environment to form an active layer, applying to the active coating material magnetic particles coated with colloidal silica, said silica-coated magnetic particles having an electrostatic charge thereon in an aqueous environment opposite to the charge on said active coating material, whereby the magnetic particles are electrostatically attracted to and bonded to said active material to form a magnetic layer, and applying a magnetic field to said magnetic particles to magnetically align said particles.

公开(公告)号：DE2554085A1

公开(公告)日：1976-07-15

申请号：DE2554085

申请日：1975-12-02

Applicant: IBM

Inventor： CHIOU CHARLES ,  GALLI GUIDO ,  LOEFFLER KARL H ,  LORENZ MAX RUDOLPH

IPC: B05B1/02 ,  B26F1/26 ,  B41J2/16 ,  G01D15/18 ,  H04N1/034 ,  B41J3/04

Abstract: 1493667 Ink jets INTERNATIONAL BUSINESS MACHINES CORP 27 Oct 1975 [31 Dec 1974] 43996/75 Heading B6P A nozzle structure for an ink jet includes a monocrystalline semi-conducting substrate 20 with an array of passages 21 (only one shown), and a layer 22 of uniform thickness overlying the substrate with orifices 23, each passage 21 is associated with an orifice 23 and their central axes are aligned. As shown a silicon substrate 20 receives a layer 22 (silicon dioxide or nitride) by vapour deposition, sputtering or thermal oxide growth. In step C a mask 35 is applied to control the anisotropic etching to produce passage 21 (step D). The orifice 23 can be produced by chemical/ sputter/ion/plasma etch through a mask 36.

公开(公告)号：DE2236927A1

公开(公告)日：1973-02-08

申请号：DE2236927

申请日：1972-07-27

Applicant: IBM

Inventor： LORENZ MAX RUDOLPH ,  SRINIVASAN RANGASWAMY

IPC: B41M5/28 ,  G03C1/73 ,  G11B7/24

Abstract: A thermochromic recording device is prepared from reversible photochromic materials. The photochromic material, dissolved in a plastic matrix, is coated onto a substrate. The coating is exposed to light radiation to produce a color therein. The colored layer or film can be rapidly written upon with low energy lasers or light emitting diodes to effect a visible image. Spots having 3 mu diameters can be recorded with energies as low as 0.043 nanojoules/ mu 2.