Method and a system for testing a cathode ray tube or like products
AssigneeEerise Corporation
InventorsYi-ping Hung, Yau-liang Tsai, George J. Yang
Life of this patent
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Abstract
A method and a system for testing a cathode ray tube (CRT) or like products such as a cathode ray tube monitor, using at least two electronic cameras which offer a stereo vision to read a locating pattern produced on the screen of a tested CRT, thereby a preparatory positioning process of the CRT relative to the electronic cameras is not necessary.
Claims10
An improvement in a method for testing a row of cathode ray tubes or cathode ray tube monitors, both hereinafter generally referred to as CRT, transported in a horizontal direction, said method comprising producing a standard test pattern on a CRT being tested, reading the screen of said CRT using at least one electronic camera, inputting the read data into a computer to obtain the actual values of the various geometrical parameters of the standard test pattern relative to said screen, the nominal values of various geometrical parameters of the standard test pattern relative to said screen being stored in said computer, and comparing said actual values of the geometrical parameters with said nominal values to obtain the deviations of said actual values from said nominal values, so as to adjust said CRT, the improvement comprising producing a locating pattern comprising at least three locating points on said tested CRT, reading the locating pattern using an electronic camera assembly which comprises at least two electronic cameras, of which the relative position between each individual camera is known, wherein at least two of the electronic cameras of said assembly respectively read the whole said locating pattern to obtain the position of said electronic camera assembly relative to said CRT, and using at least one of said electronic cameras of said assembly to read said standard test pattern.
An improvement in an automatic testing system for testing a row of cathode ray tubes or cathode ray tube monitors one by one, both hereinafter generally referred to as CRT's, said CRT's being conveyed in a horizontal direction, said system comprising electronic camera means to read the bezel of a CRT of said row of CRT's which is being tested and a standard test pattern produced on said CRT being tested, said system being connectable to a computer in which the nominal values of the geometrical parameters of said standard test pattern relative to the screen of said CRT is stored and which receives the actual values of the read data from said electronic camera means, the improvement comprising in that said electronic camera means is an electronic camera assembly comprising at least two electronic cameras which are fixed relative to each other and of which the relative position between individual cameras is known, said system further comprising a software which can be installed in said computer and is so programmed that prior to the production of said standard test pattern a locating pattern comprising at least three points is produced on said screen and at least two electronic cameras of said electronic camera assembly are allowed to read said locating pattern to obtain the position of said CRT relative to said electronic camera assembly.
Dependencies are inferred from the claim text.