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Method of reproducing an electrostatic charge pattern in intensified form

  • US 3,934,180 A
  • Filed: 08/12/1974
  • Issued: 01/20/1976
  • Est. Priority Date: 08/12/1974
  • Status: Expired due to Term
First Claim
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1. A method of reproducing, on an electrically insulating film, an electrostatic charge pattern in an intensified form conforming substantially in configuration to an original monopolar electrostatic charge pattern on an electrically insulating image-bearing surface, said method comprising the steps of:

  • a. placing one surface of said film into an area of influence of said original monopolar electrostatic charge pattern on said image-bearing surface,b. applying momentarily a source of charge migration to all areas of the other surface of said film, whereby to induce on said other surface a monopolar electrostatic charge pattern of opposite polarity to that of the original monopolar electrostatic charge pattern,c. removing said film from said image-bearing surface and applying momentarily a source of charge migration to said one surface of said film, whereby to induce an electrostatic charge pattern of the same polarity as that of said original monopolar electrostatic charge pattern thereon and to provide said film with a bipolar charge,d. disposing said one surface of said film adjacent to said image-bearing surface so that the electrostatic charge patterns thereon of the same polarities are in register with each other, and,e. applying momentarily a source of charge migration to all areas of said other surface of said film, whereby to induce on said other surface a monopolar electrostatic charge superimposed on said bipolar charge.

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