US PATENT SUBCLASS 313 / 526
.~.~ Proximity focus type


Current as of: June, 1999
Click HD for Main Headings
Click for All Classes

Internet Version by PATENTEC © 1999      Terms of Use



313 /   HD   ELECTRIC LAMP AND DISCHARGE DEVICES

523  DF  PHOTOSENSITIVE {12}
525  DF  .~ Having phosphor screen {5}
526.~.~ Proximity focus type


DEFINITION

Classification: 313/526

Proximity focus type:

(under subclass 525) Subject matter wherein the electrode is a photocathode having an extensive area so that an electromagnetic radiation image external to the device may be projected onto the photocathode, through the envelope, to emit electrons in the shape of the electromagentic radiation image and the screen is placed close enough to the cathode so that no focusing is required to have the electron image impact the screen.