OCR Text |
Show 'Back Drop' Aids Television Transmitting A black "back drop" for the screens of television transmitting tubes results in more sharply focused fo-cused and detailed television image according to a patent (No. 2,155,391) issued to Willard Hickok of Bloom-field, Bloom-field, N. J. The "back drop" is a film of graphite at the back of the transparent trans-parent mica support on which are mounted the photo-electric elements that convert the scene being televised tele-vised into an electric image and which is broadcast through the ether. It is explained that when the scene is focused on the ordinary photo-electric screen of the "tele-eye" "tele-eye" tube, light from the image is reflected, bounces off the walls of the tube back on to the screen so that a double image may be formed. At the same time the photo-electric elements scatter the light. All this, it is indicated, blurs and makes hazy the image to be broadcast. The black "back drop," which is the subject of the patent, on the other hand, absorbs the light which would thus ordinarily be reflected. The result is a sharper, more detailed de-tailed image. |