IEC 60139 pdf download

IEC 60139 pdf download Preparation of outline drawings for cathode-ray tubes, their components, connections and gauges
1Scope
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 theobject of encouraging the same practice when publications are prepared in different countries.These recommendations are contained in the specimen drawings，descriptive text and in thetables 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,subsequentamendments to,or revisions of,any of these publications do not apply.However,parties toagreements based on this International Standard are encouraged to investigate the possibilityof applying the most recent editions of the normative documents indicated below.For undatedreferences, the latest edition of the normative document referred to applies. Members of lECand lso maintain registers of currently valid lnternational Standards.
IEC 60027-1:1995,Letter symbols to be used in electrical technology – Part 1 : GenerallEC 6005o (all parts),International Electrotechnical Vocabulary (IEv)
IEC 60617 (all parts),Graphical symbols for diagrams
ISO 1000: Sl units and recommendations for the use of their multiples and of certain otherunits
3Definitions
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 insulatingenvelope 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 centrepoint 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 isperpendicular 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 isperpendicular 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 safetyhardware 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 theCRT 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 asviewed from yoke reference line