The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 03, 1984
Filed:
Oct. 06, 1982
Applicant:
Inventors:
Assignee:
Matsushita Electronics Corporation, Kadoma, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H01J / ;
U.S. Cl.
CPC ...
313467 ; 313473 ;
Abstract
A cathode-ray tube has a phosphor screen which is made by using a mixture of a long persistent phosphor and a short persistent phosphor. A light emission from the short persistent phosphor has a spike figure, so that a light pen can have sufficient sensitivity therefor, and a light emission from the long persistent phosphor is continuous within the one cycle period of the frame frequency, so that flicker is not noticeable.