| 摘要 |
399,108. Television. PECK, W. H., 350, Central Park West, New York, U.S.A. March 28, 1933, No. 9367. Convention date, March 28, 1932. [Class 40 (iii).] Convex lenses L1, Ln, Lx covering reflecting surfaces are used for scanning. The lenses are plano-convex or double convex with the rear surface silvered, or the light may be incident on the rear surface beyond the critical angle. The lenses are in a circle on a rotating scanning- disc 10 and successive lenses are canted by screws 12 to explore successive lines. The size of the image on a fixed screen 2 is adjusted by a lens 14. |
