| 摘要 |
PURPOSE:To automatize quantitative measurement at a production time and improve precision by using a black-and-white TV camera to pick up the screen of a receiver and comparing horizontal and vertical rester lack quantities with each other in respect to time. CONSTITUTION:Rated voltage power source 5 for projecting white raster throughout the available picture area by white signal 9 applied to adjusted TV receiver 8 and low voltage power source 6 for projecting white raster in the area smaller than the available picture area are supplied while being switched to pick up the raster lack quantity between both white rasters by black-and-white TV camera 11. Then, the time of the part corresponding to raster lack in picked up output waveforms is measured in 15, and the difference time corresponding to the difference between screen horizontal and vertical raster lack quantities is operated in 16, and the difference signal is outputted to detect the screen position in 19. Then, the difference signal is used to drive screen position adjustment mechanism 18 of receiver 8, thereby controlling so that the difference signal may be zero. |
