Classifications

• • G—PHYSICS
  • G11—INFORMATION STORAGE
  • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
  • G11B11/00—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
  • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
  • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
  • B41M5/20—Duplicating or marking methods; Sheet materials for use therein using electric current
  • B41M5/205—Duplicating or marking methods; Sheet materials for use therein using electric current and an eroding electrode
• • G—PHYSICS
  • G11—INFORMATION STORAGE
  • G11C—STATIC STORES
  • G11C11/00—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10S101/00—Printing
  • Y10S101/29—Printing involving a color-forming phenomenon

Definitions

• the present invention relates to electrochemical recording of electric currents of any kind; and has among its objects the production of material upon which the record may be made and a proc- 5 ess of making a record of electric currents and of variations therein.
• a further object of the invention is the production of impregnated or coated material upon which the recording is to be made, which contains a reagent or reagents which will combine with the metal ions leaving the recording electrode to form immediately and directly an insoluble coloring substance.
• this primarily formed substance has an adsorption power as high as possible, for the colored substances are only held fast by the adsorbing effect of the carrier substance.
• the whole accomplishment of this prior method recording therefore becomes very complicated.
• the adsorbing effect is dependent only upon. the nature of the surface of the carrier substance. Therefore the color. will not be proportional to the intensity of the current, because the secondary coloring reaction needs a certain time for completion while'the adsorbing power of the carrier substance decreases.
• the present invention by the use of proper imbibing substances and the electrochemical effect of the electrode recording the current, induces immediately (and without intermediate or catalytic reaction) a coloring reaction which gives a reaction product which is practically insoluble and at the same time colored.
• This reaction takes place practically instantaneously; and results in practically absolute sharpness of recording.
• Another important matter to be considered in choosing the reactions is that they also must b'e fit for recording high frequencies, like the highest musical audible frequencies. Therefore one had to take into consideration the most sensitive reaction groups, which at the same time satisfy the condition of an insoluble colored reaction product or precipitate.
• Another advantage obtained by the present invention is that the coloring reaction is not merely superficially done and fixed like in the methods mentioned under 2, but that much more a penetrating effect of the coloring reaction together with an intensity of color (color tone) proportional to the current flow is obtained. Owing to the penetrating effect of the method of the present invention the resistance against mechanical stress by the electrode pin (pencil) is essentially increased. On account of the stability of the final products, it is also perfectly impossible for the color to turn pale or fade.
• the quantitative yield per unit of time will be low and it is only possible to increase the conductivity of the soaking solution to a limited extent, the sensitiveness of a reaction, which, as above mene tioned, is of outstanding importance in the pres- .ent case, can be evaluated from two points of view.
• the test limit is important, i. e. the smallest quantity of substance which can be found by the reaction, no matter in what volume. on the other hand, the limiting concentration is less important. Therefore one has to take into account especially such reactions, the test limit of which is as low as possible.
• the sensitiveness is in many cases limited by the visibleness of the final products. If the molecules are enlarged by bringing in weight increasing groups of atoms and the coloring effect is intensified by the addition of cbloring groups, this limit is extended. As also insolubility and stability are required, the number of available reactions is considerably diminished. In the present invention all these necessities are satisfled by the use of reactions which lead to the formation of inner complex. comr ounds. Compounds which have a ring of five or six members are especially suitable, which compounds are characterized by high stability. In this group we find a series of reactions which fully satisfy all conditions.
• the copper salt or the diamide oi thio-oxalic acid serves as illustrative. The copper is not only by principal valencies linked to the two sulphur atoms, but also by secondary valencies to the two Nil-groups.
• Recording can be made on opaque material like paper or on transparent material like cellophane, gelatine, etc. when a record ribbon is mentioned herein is always meant a sheet of the substance to be impregnated in any form and not only in the form of a long narrow ribbon.
• the record ribbon is suitably impregnated with a solution (for example alcoholic solution) of diamide of thio-oxalic acid.
• a salt can be added, for instance sodium acetate, which at the same time advances the reaction by shifting the equilibrium in the solution in favor of the aciiorm of the diamid.
• a copper or nickel pir. or a pin of silicon bronze (Cu-+0.05% Si) which by the action 01 the current goes into solution.
• the record is of black color. The slight original hue of the diamide can easily be removed by subsequent washing in case it should be bothersome, without changing in the least the color of the lines. The high sensitiveness allows the highest speeds of recording.

Landscapes

• Engineering & Computer Science (AREA)
• Computer Hardware Design (AREA)
• Color Printing (AREA)
• Materials For Photolithography (AREA)

Applications Claiming Priority (1)

Publications (1)

Family

ID=3673898

Family Applications (1)

Country Status (4)

Cited By (11)

Families Citing this family (2)

• 0
  • BE BE396040D patent/BE396040A/xx unknown
• 1933
  • 1933-05-03 US US669278A patent/US2038486A/en not_active Expired - Lifetime
  • 1933-05-04 GB GB13064/33A patent/GB418683A/en not_active Expired
  • 1933-05-04 DE DEG85466D patent/DE649281C/de not_active Expired

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