Title: Phosphor protection for X-Y loops

Abstract: An improved X-Y or vector type cathode ray tube circuit includes means to sense the imminence of and to inhibit excessive concentrations of electron beam current during the plotting of X-Y loops, which concentrations produce spots or points on the cathode ray tube screen that are essentially repetitive and convey no useful information to the observer, and if allowed to persist, tend to burn the phosphor coating of said screen.

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Inventors: Quarton, William T. (Englewood, CO, US)
Lowe, Peter R. (Englewood, CO, US)

Application Number: 624905
Filing Date: 1975-10-22
Publication_date: 1977-06-28
Assignee: Honeywell Inc. (Minneapolis, MN)
Primary Class(es): 345/418 315/379, 340/146.2, 345/14
Other Classes:
US Patent Ref:

3509542	Apr, 1970	Ehrman	340/324.
3643124	Feb, 1972	Aiani et al.	315/367.
3665410	May, 1972	Holland	340/324.
3700955	Oct, 1972	Lowe	315/379.
3775760	Nov, 1973	Strathman	340/324.
3878984	Apr, 1975	Sotiropoulos et al.	324/103.
3889244	Jun, 1975	Sinobad	315/365.
3924078	Dec, 1975	Bussey	324/103.

Other Refs:
Primary Examiner: Smith, Jerry
Assistant Examiner:
Attorney: Marhoefer; Laurence J., Burton; Lockwood D.