IEC 60139 pdf download.Preparation of outline drawings for cathode-ray tubes, their components, connections and gauges
This International Standard gives guidance on the preparation of outline drawings of cathode- ray tubes (CRTs), tube components, tube sub-assemblies and ancillary components with the object of encouraging the same practice when publications are prepared in different countries. These recommendations are contained in the specimen drawings, descriptive text and in the tables of required dimensions.
2 Normative references
The following normative documents contain provisions which, through reference in this text, constitute provisions of this International Standard. For dated references, subsequent amendments to, or revisions of, any of these publications do not apply. However, parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the normative document referred to applies. Members of IEC and ISO maintain registers of currently valid International Standards. IEC 60027-1 :1 995 , Letter symbols to be used in electrical technology – Part 1 : General IEC 60050 (all parts), International Electrotechnical Vocabulary (IEV) IEC 6061 7 (all parts), Graphical symbols for diagrams ISO 1 000: SI units and recommendations for the use of their multiples and of certain other units
3.1 Terms and definitions For the purpose of this International Standard, the following definitions apply. 3.1 .1 anode button conductive contact which provides electrical continuity from the outside of the insulating envelope to the anode electrode inside the tube 3.1 .2 axes of the CRT 3.1 .2.1 principal axis axis perpendicular to the panel and the phosphor screen which passes through the centre point of the panel, the funnel, deflection yoke region and the electron gun 3.1 .2.2 major axis axis in the direction of the longer dimension of the CRT screen which passes through and is perpendicular to the principal axis, normally the horizontal axis 3.1 .2.3 minor axis axis along the shorter dimension of the CRT screen which passes through and is perpendicular to the principal axis, normally the vertical axis 3.1 .2.4 diagonal axis axis connecting opposite corners of the CRT screen 3.1 .3 band hardware that surrounds the CRT panel and 1 ) holds the mounting lugs and implosion safety hardware to the CRT, 2) applies compressive loads to the panel for mechanical safety and 3) contains the panel glass temporarily in the event of breakage NOTE This band may be mechanically tensioned and joined at a junction; it may be joined to the CRT with resin, or it may also be a single piece that is thermally shrunk over the panel (so called shrink-fit). 3.1 .4 beam clearance clearance between the electron beam path and the flare region of the funnel connecting the CRT neck to the body of the funnel NOTE Prevention of beam impact on the glass is critical for proper operation. 3.1 .5 centre face thickness (CFT) thickness of the panel at its centre 3.1 .6 corner angle angle between the major axis and a diagonal of the nominal screen of the design aspect ratio 3.1 .7 deflection angles angles subtended by the major axis, minor axis and diagonal dimensions of the screen as viewed from yoke reference line 3.1 .8 design aspect ratio design value of the ratio of the long to short dimensions of a rectangular area, typically expressed as a ratio of whole integers such as “4 by 3” or “1 6 by 9” 3.1 .9 diagonal line joining opposing corners 3.1 .1 0 frit seal line line formed by the frit joint between the panel and funnel 3.1 .1 1 heel radius radius of the blend between the principal panel surface and the panel skirt