Electronic billboard

Claim 1

An electronic billboard sign which comprises: a) a housing having an interior display screen and a large front billboard screen; b) an electronic cartridge having advertising information therein, said cartridge disposed within said housing; c) an electronic visual means for transferring the advertising information from said cartridge to the interior display screen in the form of images; d) means for enlarging and transferring the images from the interior display screen to the large front billboard screen for viewing, wherein said electronic visual means includes a visual display unit comprising: e) an analog signal convertor for receiving the advertising information from said cartridge; f) an electron gun having a deflecting yoke for receiving the advertising information from said convertor and sending a scanning electron beam to the interior display screen; g) the interior display screen including a plurality of microdots which are activated in grid patterns by the scanning electron beam from said electron gun to form the images; h) a first screen lamp for supplying light onto the microdots which will light up when activated by the scanning electron beam from said electron gun; i) a second screen lamp for supplying light onto the large front billboard screen which will light up the advertising information to be viewed therefrom; and j) a switch for varying amount of light from said screen lamps to compensate for degree of surrounding brightness on the interior display screen and the large front billboard screen, wherein said enlarging and transferring means includes; k) a pair of horizontal gear tracks, each formed on an opposite interior side wall of said housing; l) a large lens having a support arm extending from each side thereof; m) a pair of gears, each freely rotatably disposed on one end of the support arm to travel along one of said gear tracks; n) a motor connected to the support arm, said motor having a shaft with gear drive thereon, the gear drive in cooperation with one of said gears on the support arm; o) a control knob electrically connected to said motor motor so as to operate the shaft; p) said housing having elongated slot in each of the side walls adjacent each of said gear tracks; q) a scale on exterior of each of the side walls along each of the elongated slots; and r) a pointer extending from each end of the support arm through each of the slots to indicate amount of movement of the support arm with respect to said scales.