IEC 60139:2000 pdf free 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.
2Normative 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: GeneralIEC 60050(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
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.
3.1.11 heel radius
radius of the blend between the principal panel surface and the panel skirt
3.1.12 integral neck components
devices attached to the neck and/or funnel of the CRT by the manufacturer
3.1.13 lug
mounting hardware that has a blade section generally furnished with a mounting hole toreceive a mounting bolt
3.1.14 magnetic shield
ferromagnetic cone,roughly the shape of the funnel, that excludes external magnetic fieldsfrom the electron beam region
3.1.15 mould-match line
line of maximum dimension of the moulded part, located at the mating plane of the two halvesof a mould
3.1.16 mounting system
hardware attached to the CRT that facilitates mounting the CRT
3.1.17 projected screen dimensions
screen dimensions as they appear to a viewer outside the CRT (at infinite distance)
NOTE The dimensions are projected along optical paths from the screen surface onto a plane perpendicular tothe principal CRT axis.