SIST EN 61077:1999

SLOVENSKI STANDARD
SIST EN 61077:1999
01-julij-1999
Helical-scan video tape cassette system using 12,65 mm (0,5 in) magnetic tape on
type VHS - Compact VHS video cassette (IEC 61077:1991)
Helical-scan video tape cassette system using 12,65 mm (0,5 in) magnetic tape on type
VHS - Compact VHS video cassette
Video-Bandkassettensystem mit Schrägspuraufzeichnung auf Magnetband 12,65 mm
(0,5 in) VHS-Format - Kompakte Videokassette
Système de magnétoscope à cassette de balayage hélicoïdal utilisant la bande
magnétique de 12,65 mm (0,5 in) (format VHS) - Cassette vidéo compacte de format
VHS
Ta slovenski standard je istoveten z: EN 61077:1991
ICS:
33.160.40 Video sistemi Video systems
SIST EN 61077:1999 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------

NORME CEI
INTERNATIONALE IEC
61077
INTERNATIONAL
Première édition
STANDARD
First edition
1991-09
Système de magnétoscope
à cassette
à balayage hélicoïdal utilisant
la bande
magnétique
de 12,65 mm (0,5 in) (format VHS) –
Cassette
vidéo compacte de format VHS
Helical-scan video tape cassette system
using 12,65 mm (0,5 in) magnetic tape
on type VHS –
Compact VHS video cassette
© IEC 1991 Droits de reproduction réservés
— Copyright - all rights reserved
Aucune partie de cette publication ne peut étre reproduite ni No part of this publication may be reproduced or utilized in
utilisée sous quelque forme que ce soit et par aucun any form or by any means, electronic or mechanical,
procédé, électronique ou mécanique, y compris la photo- including photocopying and microfilm, without permission in
copie et les microfilms, sans l'accord écrit de l'éditeur. writing from the publisher.
International Electrotechnical Commission 3, rue de Varembé Geneva, Switzerland
Telefax: +41 22 919 0300 e-mail: inmail@iec.ch IEC web site http: //www.iec.ch
CODE PRIX
Commission Electrotechnique Internationale
PRICE CODE
International Electrotechnical Commission
IEC Me»iayHapo QHaR 3neKTpoTexHwiecKaA
HOMHCCHA
Pour prix, voir catalogue en vigueur
• •
For price, see current catalogue

---------------------- Page: 2 ----------------------

1077©IEC - 3 -
CONTENTS
Page
FOREWORD 5
Clause
1 Scope 7
2 Normative references 7
3 Mechanical parameters of the compact VHS video casse tte 7
3.1 Dimensions of the compact VHS video casse tte 7
3.2 Front cover 7
3.3 Reel dimensions and brake force 9
3.4 Tape winding and tape path 9
3.5 E-value 11
3.6 Guide rollers 11
3.7 Reel spring force 11
3.8 Positioning screw of take-up reel 11
4 Dimensions and characteristics of the video tape 11
4.1 Magnetic tape thickness 11
4.2 Magnetic tape width 11
4.3 Magnetic tape length 11
4.4 Magnetic tape properties 11
5 Leader tape and trailer tape 13
5.1 Light transmittance 13
5.2 Dimensions of the leader and trailer tape 13
5.3 Splicing 13
6 Amount of tape remaining 13
Figures 14
Annexes
A Designation of compact VHS video casse
ttes and specifications 39
B Compact VHS video cassett e adaptor 41

---------------------- Page: 3 ----------------------

1077©IEC - 5 -
INTERNATIONAL ELECTROTECHNICAL COMMISSION
HELICAL-SCAN VIDEO TAPE CASSETTE SYSTEM
USING 12,65 mm (0,5 in) MAGNETIC TAPE ON TYPE VHS –
COMPACT VHS VIDEO CASSETTE
FOREWORD
1) The formal decisions or agreements of the IEC on technical matters, prepared by Technical Committees on
which all the National Committees having a special interest therein are represented, express, as nearly as
possible, an international consensus of opinion on the subjects dealt with.
2) They have the form of recommendations for international use and they are accepted by the National
Committees in that sense.
3)
In order to promote international unification, the IEC expresses the wish that all National Committees
should adopt the text of the IEC recommendation for their national rules in so far as national conditions will
permit. Any divergence between the IEC recommendation and the corresponding national rules should, as
far as possible, be clearly indicated in the latter.
This International Standard has been prepared by Sub-Committee 60B: Video recording,
of IEC Technical Committee No. 60: Recording.
The text of this standard is based on the following documents:
DIS Report on Voting
60B(CO)125
60B(CO)137
Full information on the voting for the approval of this standard can be found in the Voting
Report indicated in the above table.
Annex A forms an integral pa rt of this International Standard.
Annex B is for information only.

---------------------- Page: 4 ----------------------

1077©IEC - 7 -
HELICAL-SCAN VIDEO TAPE CASSETTE SYSTEM
USING 12,65 mm (0,5 in) MAGNETIC TAPE ON TYPE VHS
COMPACT VHS VIDEO CASSETTE
1 Scope
This International Standard defines the mechanical parameters and characteristics of the
compact VHS video cassette.
With the aid of a compact VHS cassette adaptor (an example of which is illustrated in an-
nex B), the compact video cassette may also be used in the same manner as a normal
VHS video cassette for recording and/or reproducing video signals in accordance with the
system defined in IEC 774.
2 Normative references
The following standard contains provisions which, through reference in this text, constitute
provisions of this International Standard. At the time of publication, the edition indicated
was valid. All standards are subject to revision, and pa rties to agreements based on this
International Standard are encouraged to investigate the possibility of applying the most
recent edition of the standard indicated below. Members of IEC and ISO maintain registers
of currently valid International Standards.
IEC 774: 1983,
Helican-scan video tape cassette system using 12,65 mm (0,5 in) magne-
tic tape on type VHS.
3 Mechanical parameters of the compact VHS video cassette
3.1 Dimensions of the compact VHS video cassette
The dimensions of the compact video cassette shall be in accordance with figures 1 to 6.
The cassette dimensions are given for two types of front covers, with and without a front
cover locking-structure.
3.2 Front cover
3.2.1
Front cover with a locking-structure
The front cover with a locking-structure is shown in figure 7.
With this type of casse
tt
e, a permanent spring force is used to keep the front cover shut.

---------------------- Page: 5 ----------------------

1077©IEC - 9 -
The forces F1
and F2 necessary to open the front cover with the lock released, as defined
in note 1 of figure 7, shall be as follows: :
0,1 N
<_ 0,25 N
< F1
<
0,05 N F2 <- 0,2 N
Even when the front cover is locked, it shall be forcibly released with a force F3 of less
than 0,8 N applied to the unlocking position, as indicated in note 3 of figure 7.
The unlocking pin shall be pushed to the unlocking position indicated in note 4 of figure 7
with a force F4
of less than 0,8 N.
The unlocking pin shall be pushed to the surface of the cassette side wall with a force F5
less than 3 N (see note 6 of figure 7).
3.2.2
Front cover without a locking-structure
The front cover without a locking-structure is shown in figure 8.
The front cover has two stable positions: completely closed and completely open.
The front cover shall open or close by itself when it is within an angle of 20° of its
completely open or completely closed position as indicated in note 1 of figure 8.
The forces F1 and F2
necessary to open and close the front cover as shown in figure 8
shall be as follows:
<
0,05 N - Fi <- N
0,2
<
0,05 N <_ F2 0,2 N
3.3 Reel dimensions and brake force
The dimensions of the reel shall be in accordance with figures 9 and 10.
The tape shall be pulled out with the following forces, as shown in note 3 of figure 9 and
note 2 of figure 10, with the brake engaged:
Supply reel: <
0,4 N F <_ 1,5 N
Take-up reel: <
0,05 N F
<_ 3 N
3.4
Tape winding and tape path
The tape winding and tape path shall be in accordance with figure 11.

---------------------- Page: 6 ----------------------

1077 © IEC - 11 -
3.5 E-value
The E-values 1. and 12 are shown in notes 1 and 2 of figure 11 and shall each be greater
than 0,7 mm.
NOTE - The E-value is the radial clearance between the outer edge of the wound tape and the edge of the
reel flange.
Guide rollers
3.6
Guide rollers shall be provided as shown in figure 11.
The inclination of all rollers shall be within 0,1 mm.
3.7 Reel spring force
e, as shown in note 4 of figure 12, shall be pushed down by a reel
The reels in the cassett
spring with the following forces:
supply reel: 1,6 ± 0,4 N;
0 N.
take-up reel: 0,7 +0,2
Positioning screw of take-up reel
3.8
The deviation of the centre of the positioning screw head shall be less than 0,05 mm from
the take-up reel axis (see figure 12).
4 Dimensions and characteristics of the video tape
4.1 Magnetic tape thickness
For the thickness of the magnetic tape, including the coating, see annex A.
4.2 Magnetic tape width
For the width of the magnetic tape, 10.2 of IEC 774 shall apply.
4.3 Magnetic tape length
For the length of the tape, see annex A.
4.4 Magnetic tape properties
For the properties of the magnetic tape, clause 11 of IEC 774 shall apply.

---------------------- Page: 7 ----------------------

1077©IEC - 13 -
5 Leader tape and trailer tape
5.1 Light transmittance
The light transmittance of the leader and trailer tape shall be at least 70 % in order to
ensure that the automatic stopping device of the machine functions properly at both ends
of the magnetic tape.
5.2 Dimensions of the leader and trailer tape
The leader and trailer tape length shall be 80 ± 5 mm and 110 ± 5 mm, respectively.
The leader and trailer tape thickness shall be 20+62 and the width shall be
12,65 ± 0,03 mm.
5.3 Splicing
The splice and the attachment of the leader and trailer tape to the hub shall be capable of
resisting a force of 30 N. The splicing gap shall be less than 0,07 mm.
6 Amount of tape remaining
The window and the upper flange of the supply reel shall be transparent to indicate the
amount of tape remaining.

---------------------- Page: 8 ----------------------

1077©IEC - 15 -
Note 7
92 '
0 ,2
20,5 ± 0,2
Note 1
88 ± 0,2
Note 3
— Note 2
Datum line
Note 4
cn v
ô
ô
...