IEC 61965:2003

Mechanical safety of cathode ray tubes

Applicable to cathode ray tubes and cathode ray tube assemblies which are intended for use as components in apparatus and which have integral protection with respect to the effects of implosion. A CRT covered by this standard is intended to be installed in an enclosure designed both to protect the rear of the CRT against mechanical or other damage under normal conditions of operation and to protect the user against particles expelled in a backwards direction from the CRT face in the event of implosion.

General Information

• Status: Published
• Publication Date: 10-Jul-2003
• ICS: 01 - GENERALITIES. TERMINOLOGY. STANDARDIZATION. DOCUMENTATION
• ICS: 31.100 - Electronic tubes
• Technical Committee: TC 110 - Electronic displays
• Current Stage: PPUB - Publication issued
• Start Date: 15-Oct-2003
• Completion Date: 11-Jul-2003

Relations

• Revises: IEC 61965:2000 - Mechanical safety of cathode ray tubes
• Effective Date: 05-Sep-2023

Standards Content (Sample)

INTERNATIONAL IEC
STANDARD
Second edition
2003-07
Mechanical safety of cathode ray tubes
Sécurité mécanique des tubes cathodiques
Reference number
Publication numbering
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60000 series. For example, IEC 34-1 is now referred to as IEC 60034-1.
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edition numbers 1.0, 1.1 and 1.2 refer, respectively, to the base publication, the
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INTERNATIONAL IEC
STANDARD
Second edition
2003-07
Mechanical safety of cathode ray tubes
Sécurité mécanique des tubes cathodiques
 IEC 2003  Copyright - all rights reserved
No part of this publication may be reproduced or utilized in any form or by any means, electronic or
mechanical, including photocopying and microfilm, without permission in writing from the publisher.
International Electrotechnical Commission, 3, rue de Varembé, PO Box 131, CH-1211 Geneva 20, Switzerland
Telephone: [phone] Telefax: [phone] E-mail: [e-mail]  Web: www.iec.ch
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XA
International Electrotechnical Commission
Международная Электротехническая Комиссия
For price, see current catalogue

– 2 – 61965  IEC:2003(E)
CONTENTS
FOREWORD . 5
INTRODUCTION .6
1 Scope . 7
2 Normative references. 7
3 Definitions . 8
4 General requirements . 9
4.1 Corrosion protection . 9
4.2 Mechanical damage. 9
4.3 Handling . 9
4.4 Film-coated CRTs. 9
5 Environmental conditioning .10
5.1 Standard atmospheric conditions for testing.10
5.2 Preconditioning.10
5.3 Thermal conditioning .10
6 Sampling .10
6.1 Sampling plans .10
6.2 Sample numbers.10
6.3 Compliance .10
7 Test preparation and set-up .10
7.1 Scratch patterns .10
7.2 Barriers .11
7.3 Mounting .11
7.4 Mounting position .11
8 Testing of large CRTs.11
8.1 Mechanical strength (ball impact test).11
8.2 Implosion test (missile) .12
8.3 Implosion test (thermal shock) .13
8.4 High-energy impact test.13
9 Testing of small CRTs.14
9.1 Mechanical strength (ball impact test).14
9.2 Implosion test (high ball).15
9.3 Implosion test (thermal shock) .15
9.4 High-energy impact test.15
10 Testing of prestressed banded CRTs with protective film .16
10.1 General .16
10.2 Film scoring pattern for CRTs with protective film .16
10.3 Peel test .17
10.4 Immersion test.17
11 Marking .17
12 Application notes for pre-stressed banded CRTs with protective film.18
13 Normative requirements for the use of Tables 1 and 2 (prestressed banded CRTs) .18
13.1 Sampling plan I: New construction .18
13.2 Sampling plan II: New construction with known resin or tape .19
13.3 Sampling plan III: Tension band and alternative tension band.19
13.4 Sampling plan IV: Alternative construction .20

61965  IEC:2003(E) – 3 –
14 Normative requirements for the use of Tables 3 and 4 (prestressed banded with
protective film).21
14.1 Sampling plan I: New construction .21
14.2 Sampling plan II: New construction with known resin, tape, film or adhesive.22
14.3 Sampling plan III: Alternative tension band .22
14.4 Sampling plan IV: Alternative construction .23
15 Alternative thermal conditioning for use with Tables 3 and 4 (prestressed banded
with protective film).24
15.1 Additional peel force requirements where alternative thermal conditioning is
to be performed .24
15.2 Tensile strength test where alternative thermal conditioning is to be
performed.24
16 Normative requirements for the use of Tables 6 and 7 (bonded frame CRTs).25
16.1 Sampling plan I: New construction .25
16.2 Sampling plan II: Alternative construction .26
17 Normative requirements for the use of Tables 8 and 9 (laminated CRTs) .26
17.1 Sampling plan I: New construction .26
17.2 Sampling plan II: Alternative construction .26
Annex A (informative)  Background to the development of this standard.46
A.1 Mechanical strength test .47
A.2 Implosion test .47
A.3 Small CRTs (76 mm to 160 mm diagonal) .47
A.4 Evaluation time .47
Annex B (informative) Velocity and potential force of glass particles expelled from a
CRT subjected to a ball impact – Ballistic and statistical calculations .48
B.1 Introduction.48
B.2 Analysis without friction.48
B.3 Analysis with friction .54
B.4 Potential threat .57
B.5 Conclusions .57
Figure 1 – Example of a test cabinet .35
Figure 2 – Example of a ball impact test.36
Figure 3 – Example of a 2,3 kg steel missile .37
Figure 4 – Missile impact area on a typical CRT.38
Figure 5 – Example of a missile impact test.39
Figure 6 – Options for scratch patterns for implosions by the thermal shock method .40
Figure 7 – Film scoring tool.41
Figure 8 – Example of high-energy impact test set-up .42
Figure 9 – Steel pins used in high-energy impact test.43
Figure 10 –Weights used in high-energy impact test.44
Figure 11 – Example of 1,4 kg steel missile.45
Figure B.1 – Height of the barriers and distances from the CRT face.48

– 4 – 61965  IEC:2003(E)
Figure B.2 – Example of the parabolic trajectory of a glass particle and the definition of
the distances.49
Figure B.3 – Definition of the initial angle and initial velocity and the forces acting on a
particle.50
Figure B.4 – Initial velocity required to pass over barriers at x = l (solid line) or x = l
1 2
(dashed line) as a function of the initial angle β.52
Figure B.5 – Trajectories for a glass particle for different initial angles and an initial
velocity of 4 m/s .52
Figure B.6 – Definition of the forces acting on a particle.54
Figure B.7 – Measurements of a typical glass particle .55
Figure B.8 – Trajectory of a glass particle with an initial velocity of 2 m/s and an initial
angle of 45° without friction (dashed line) and with friction (solid line) .56
Figure B.9 – Trajectories of a glass particle with an initial velocity of 2 m/s and an
initial angle of 45° for different values of the cross-sectional area .57
Table 1 –
...