Method of creating isolated plates on the inside surface of a metallized substrate

A method of forming an electrostatic deflector for an electron beam machine comprising the steps of:

• coating a glass tube of a pre-selected length with a metal film except at one end of the tube where separate tabs are formed with alternate glass areas therebetween but which are connected to the coating on the inside of the tube,
• fixing the coated tube in a rigid holder,
• inserting a scribe tip directly mounted on a rigid bar within the bore of the tube and while engaging the coating cutting a circumferential line near the end of the tube opposite from the tabs to separate one part of the coating from the coating on the remainder of the tube and withdrawing the scribe tip from the tube surface,
• positioning the scribe tip over the circumferential line and into engagement with the tube and withdrawing the scribe tip longitudinally thereby scribing a thin line through the coating using the rigidity of the bar to continually urge the scribe tip into engagement with the tube,
• repeating the engagement and scribing step to form a plurality of areas which are electrically isolated from one another,
• said longitudinal lines being located between the tabs so that the tabs are electrically connected to each of the areas.

A method of forming an electrostatic deflector for an electron beam machine comprising the steps of:

• coating a glass tube of a preselected length with a metal film except at one end of the tube where separate tabs are formed with alternate glass areas therebetween but which are connected to the coating on the inside of the tube,
• fixing the coated tube in a rigid holder,
• inserting a scribe tip directly mounted on a rigid bar within the bore of the tube and while engaging the coating with drawing the scribe tip longitudinally thereby scribing a thin line through the coating using the rigidity of the bar to continually urge the scribe tip into engagement with the tube,
• repeating the engagment and scribing step to form a plurality of separated of areas,
• said longitudinal lines being located between the tabs so that the tabs are electrically connected to each of the areas, and
• positioning the scribe tip at the ends of the lines located away from the tabs and while engaging the coating cutting a circumferential line to separate one part of the coating from the coating on the remainder of the tube and thus separating each of said areas electrically from each other.