.~.~> With secondary emission stage in the cathode-ray tube {1}
DEFINITION
Classification: 315/10
(under subclass 1) Subject matter wherein the system includes means for controlling the operation of the cathode-ray device by means of radiant energy.
(1) Note. The cathode-ray tube may include a radiant energy ray sensitive electrode, that is, the operation of the cathode-ray device is altered when subjected to radiant energy, or the system may include a radiant energy sensitive device, such as a photocell, which controls the operation of the cathode-ray tube when subjected to radiant energy.
(2) Note. The term "radiant energy" as used in these definitions includes radiant energy of any type, such as X-ray, light rays whether within the visible or invisible spectrum, Hertzian waves and other radiant electrical energy excepting the electrons emitted from the cathode-ray tube electrodes, and emanations from radioactive substances.
(3) Note. This subclass does not include the combination of a cathode-ray tube and an optical device, such as a lens or mirror, etc., which is used with the cathode-ray tube for directing radiant energy to the sensitive element or generated radiant energy from the tube, even if the system of supply for the cathode-ray tube is claimed, the patent being classified with the art appropriate to the combination.
SEE OR SEARCH THIS CLASS, SUBCLASS:
149, and indented subclasses for other systems under the class definition wherein the system includes means for controlling the operation of the load device by means of radiant energy. SEE OR SEARCH CLASS
250, Radiant Energy,
200+, for photocell circuits and apparatus. Indented subclass 549 includes a cathode-ray tube device which illuminates a photocell and is controlled by said photocell while indented subclass 214 contains cathode-ray device of the image convertor or light amplifier type.
313, Electric Lamp and Discharge Devices,
365+, for cathode-ray tube structures which are photosensitive.
348, Television,
162+, for television systems responsive to radiant energy in the invisible spectrum and subclass 325 for television systems using a photoelectric controlled cathode-ray tube.
