| 摘要 |
A method is disclosed for the optical alignment of a projection television system having a bank of three light projection means for projecting into coincidence red, green and blue images to form a composite color image in space. The light projection means which are located off the projection screen axis project purposely distorted off-axis images effective to substantially compensate, upon projection, for the non-linear magnification distortion of the image resulting from the off-axis location. The method of optical alignment comprises replacing the cathode ray tubes of the light projection means with lamp means. A graticular geometrical analog of each of the projected images is interposed between the lamp means and a projection lens means. The analogs are projected consecutively and concurrently on the projection screen and the images are superimposed by manipulating adjustment means which adjust the light projection means in azimuth and elevation; whereby the images projected by the light projection means will be in substantial optical alignment each with the other and with the screen.
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