CONVERGENCE EVALUATION DEVICE FOR MULTI-CATHODE-TYPE CRT

摘要

PROBLEM TO BE SOLVED: To provide a convergence evaluation device for multi-cathode-type CRT, which can easily and speedily adjust convergence required for the manufacture of CRT such as multi-beam monochrome CRT and multi-cathode-type color CRT for irradiating the phosphor of a single color with plural electronic beams. ;SOLUTION: An operation circuit 23 calculates the address of a point where an optical sensor 12 is provided in a picture area at every electronic beam based on videos displayed for the respective electronic beams by video signals from a signal generation circuit 20. The operation circuit 23 quantitatively evaluates the state of convergence shift from the difference of the addresses by the respective electronic beams and the result is displayed on a display device 25.;COPYRIGHT: (C)1998,JPO