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Note(s)
This subclass covers only devices for producing, influencing, or using a flow of electrons or ions, e.g. for controlling, indicating, or switching of electric current, counting electric pulses, producing light or other electromagnetic oscillations, such as X-rays, or for separating or analysing radiation or particles, and having a closed or substantially closed casing containing a chosen gas, vapour, or vacuum, upon the pressure and nature of which the characteristics of the device depend.[4]This subclass does not cover light sources using combinations of discharge-type light sources and other types of light sources, which are covered by group H05B 35/00, except for those light sources covered by group H01J 61/96.In this subclass, groups H01J 1/00-H01J 7/00 relate only to:details of an unspecified kind of discharge tube or lamp, ordetails mentioned in a specification as applicable to two or more kinds of tubes or lamps as defined by groups H01J 11/00, H01J 13/00, H01J 15/00, H01J 17/00, H01J 21/00, H01J 25/00, H01J 27/00, H01J 31/00, H01J 33/00, H01J 35/00, H01J 37/00, H01J 40/00, H01J 41/00, H01J 47/00, H01J 49/00, H01J 61/00, H01J 63/00 or H01J 65/00, hereinafter called basic kinds. A detail only described with reference to, or clearly only applicable to, tubes or lamps of a single basic kind is classified in the detail group appropriate to tubes or lamps of that basic kind, e.g. H01J 17/04. In this subclass, the following term is used with the meaning indicated:"lamp" includes tubes emitting ultraviolet or infrared light. Attention is drawn to the definition of the expression "spark gaps" given in the Note following the title of subclass H01T.Apparatus or processes specially adapted for the manufacture of electric discharge tubes, discharge lamps, or parts thereof are classified in group H01J 9/00.
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