Title: Method of manufacturing a color display tube shadow mask

Abstract: A method of manufacturing a color display tube of the refocusing type in which supports of insulation material are secured against an apertured metal plate. The supports are provided with a conductor at least on the side remote from the plate, so that the plate constitutes a first set of lens electrodes and the conductors constitute a second set of lens electrodes. The two sets of lens electrodes form a quadrupole lens in each aperture in the metal plate when a voltage difference is applied between the first set and the second set. The defocusing direction of the quadrupole lens is parallel to the phosphor strips of the display screen.

Do you think this is a good invention? Vote now:

Votes so far: For:(0) Against:(0)
Other info:

Inventors: Koorneef, Jacob (Eindhoven, NL)

Application Number: 035951
Filing Date: 1979-05-04
Publication_date: 1980-09-16
Assignee: U.S. Philips Corporation (New York, NY)
Primary Class(es): 445/31 445/37
Other Classes:
US Patent Ref:

3586900	Jun, 1971	Seki et al.	313/85.
4059781	Nov, 1977	Alphen et al.	313/403.

Other Refs:
Primary Examiner: Lazarus, Richard B.
Assistant Examiner:
Attorney: Cohen; Simon L.