1、BRITISH STANDARD BS EN 61077:1992 Specification for Helical-scan video tape cassette system using12,65mm(0,5in) magnetic tape on type VHS Compact VHS video cassette The European Standard EN61077:1991 has the status of a BritishStandardBSEN61077:1992 This BritishStandard, having been prepared under t
2、he directionof the Electronic Equipment Standards Policy Committee, was published underthe authority of the Standards Board and comes intoeffect on 1April1992 BSI01-2000 The following BSI references relate to the work on this standard: Committee reference EEL/22 Draft for comment89/28961 DC ISBN 0 5
3、80 20573 8 Cooperating organizations The European Committee for Electrotechnical Standardization (CENELEC), under whose supervision this European Standard was prepared, comprises the national committees of the following countries. Austria Italy Belgium Luxembourg Denmark Netherlands Finland Norway F
4、rance Portugal Germany Spain Greece Sweden Iceland Switzerland Ireland United Kingdom Amendments issued since publication Amd. No. Date CommentsBSEN61077:1992 BSI 01-2000 i Contents Page Cooperating organizations Inside front cover National foreword ii Foreword 2 Text of EN61077 3 National annex NA
5、(informative) Committees responsible Inside back cover National annex NB (informative) Cross-reference Inside back coverBSEN61077:1992 ii BSI 01-2000 National foreword This BritishStandard has been prepared under the direction of the Electronic Equipment Standards Policy Committee and is the English
6、 language version of EN61077 “Helical-scan video tape cassette system using12,65mm(0,5in) magnetic tape on type VHS Compact VHS video cassette”, published by the European Committee for Electrotechnical Standardization (CENELEC). It was derived by CENELEC from IEC1077:1991 published by the Internatio
7、nal Electrotechnical Commission (IEC). A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Su
8、mmary of pages This document comprises a front cover, an inside front cover, pagesi andii, theEN title page, pages2 to20, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table
9、 on the inside front cover.EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN61077 October1991 UDC621.397.454 Descriptors: Video recording, video recorder, magnetic tape, video tape cassette, format English version Helical-scan video tape cassette system using12,65mm(0,5in) magnetic tape on type V
10、HS Compact VHS video cassette (IEC1077:1991) Systme de magntoscope cassette de balayage hlicoidal utilisant la bande magntique de12,65mm(0,5in) (formatVHS) Cassette vido compacte de format VHS (CEI1077:1991) Video-Bandkassettensystem mit Schrgspuraufzeichnung auf Magnetband12,65mm(0,5in) VHS-Format
11、Kompakte Videokassette (IEC1077:1991) This European Standard was approved by CENELEC on1991-09-23. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.
12、Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CENELEC member. This European Standard exists in three official versions (English, French, German). A version in any other language made by translati
13、on under the responsibility of a CENELEC member into its own language and notified to the Central Secretariat has the same status as the official versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, I
14、taly, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B-
15、1050 Brussels 1991 Copyright reserved to CENELEC members Ref.No.EN61077:1991EEN61077:1991 BSI 01-2000 2 Foreword The text of document60B(CO)125, as prepared by Sub-Committee60B: Video recording, of IEC Technical Committee No.60: Recording, was submitted to the IEC-CENELEC parallel vote in January199
16、1. The reference document was approved by CENELEC as EN61077 on23September1991. The following dates were fixed: For products which have complied with the relevant national standard before92-10-15, as shown by the manufacturer or by a certification body, this previous standard may continue to apply f
17、or production until97-10-15. Annexes designated “normative” are part of the body of the standard. In this standard, Annex ZA is normative. Contents Page Foreword 2 1 Scope 3 2 Normative references 3 3 Mechanical parameters of the compact VHS video cassette 3 3.1 Dimensions of the compact VHS video c
18、assette 3 3.2 Front cover 3 3.3 Reel dimensions and brake force 3 3.4 Tape winding and tape path 3 3.5 E-value 3 3.6 Guide rollers 3 3.7 Reel spring force 3 3.8 Positioning screw of take-up reel 3 4 Dimensions and characteristics of the video tape 4 4.1 Magnetic tape thickness 4 4.2 Magnetic tape wi
19、dth 4 4.3 Magnetic tape length 4 4.4 Magnetic tape properties 4 5 Leader tape and trailer tape 4 5.1 Light transmittance 4 5.2 Dimensions of the leader and trailer tape 4 Page 5.3 Splicing 4 6 Amount of tape remaining 4 Annex A (normative) Designation of compact VHSvideo cassettes and specifications
20、 17 Annex B (informative) Compact VHS video cassetteadaptor 17 Annex ZA (normative) Other international publications quoted in this standard with thereferences of the relevant European publications 19 Figure 1 Complete cassette case(1) 5 Figure 2 Complete cassette case(2) 6 Figure 3 Cassette lower h
21、alf(1) 7 Figure 4 Cassette lower half(2) 8 Figure 5 Cassette upper half 9 Figure 6 Cassette reference plane 10 Figure 7 Front cover with locking-structure 11 Figure 8 Front cover without locking-structure 12 Figure 9 Supply reel and reel brake 13 Figure 10 Take-up reel and reel brake 14 Figure 11 Ta
22、pe winding and guide rollers 15 Figure 12 Relative positions of reels with respectto cassette case 16 Figure B.1 Example of compact video cassetteadaptor 18 Figure B.2 Main parts and movement of thecompact video cassette adaptor 19 latest date of publication of an identical national standard (dop)19
23、92-10-15 latest date of withdrawal of conflicting national standards (dow)1992-10-15EN61077:1991 BSI 01-2000 3 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 (anexample of whi
24、ch is illustrated in Annex 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 IEC774. 2 Normative references The following standard contains provisions which, throug
25、h 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 parties to agreements based on this International Standard are encouraged to investigate the possibility of applying
26、 the most recent edition of the standard indicated below. Members of IEC and ISO maintain registers of currently valid International Standards. IEC774:1983, Helican-scan video tape cassette system using12,65mm(0,5in) magnetic tape on type VHS. 3 Mechanical parameters of the compact VHS video cassett
27、e 3.1 Dimensions of the compact VHS video cassette The dimensions of the compact video cassette shall be in accordance with Figure 1 to Figure 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
28、a locking-structure The front cover with a locking-structure is shown in Figure 7. With this type of cassette, a permanent spring force is used to keep the front cover shut. The forces F 1and F 2necessary to open the front cover with the lock released, as defined in note1 of Figure 7, shall be as fo
29、llows: 0,1Nk F 1 k 0,25N 0,05Nk F 2 k 0,2N Even when the front cover is locked, it shall be forcibly released with a force F 3of less than0,8N applied to the unlocking position, as indicated in note3 of Figure 7. The unlocking pin shall be pushed to the unlocking position indicated in note4 of Figur
30、e 7 with a forceF 4of less than0,8N. The unlocking pin shall be pushed to the surface of the cassette side wall with a force F 5less than3N (see note6 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
31、 stable positions: completely closed and completely open. The front cover shall open or close by itself when it is within an angle of20 of its completely open or completely closed position as indicated in note1 of Figure 8. The forces F 1and F 2necessary to open and close the front cover as shown in
32、 Figure 8 shall be as follows: 0,05Nk F 1 k 0,2N 0,05Nk F 2 k 0,2N 3.3 Reel dimensions and brake force The dimensions of the reel shall be in accordance with Figure 9 and Figure 10. The tape shall be pulled out with the following forces, as shown in note3 of Figure 9 and note2 of Figure 10, with the
33、 brake engaged: 3.4 Tape winding and tape path The tape winding and tape path shall be in accordance with Figure 11. 3.5 E-value The E-values l 1and l 2are shown in notes1 and2 of Figure 11 and shall each be greater than0,7mm. NOTEThe E-value is the radial clearance between the outer edge of the wou
34、nd tape and the edge of the reel flange. 3.6 Guide rollers Guide rollers, shall be provided as shown in Figure 11. The inclination of all rollers shall be within0,1mm. 3.7 Reel spring force The reels in the cassette, as shown in note4 of Figure 12, shall be pushed down by a reel spring with the foll
35、owing forces: supply reel:1,6 0,4N; take-up reel: 0,7 N. 3.8 Positioning screw of take-up reel The deviation of the centre of the positioning screw head shall be less than0,05mm from the take-up reel axis (see Figure 12). Supply reel: 0,4 Nk Fk 1,5 N Take-up reel: 0,05Nk Fk 3 N +0,3 0,2EN61077:1991
36、4 BSI 01-2000 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 IEC774 shall apply. 4.3 Magnetic tape length For the length of t
37、he tape, see Annex A. 4.4 Magnetic tape properties For the properties of the magnetic tape, clause11 of IEC774 shall apply. 5 Leader tape and trailer tape 5.1 Light transmittance The light transmittance of the leader and trailer tape shall be at least70% in order to ensure that the automatic stoppin
38、g 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 be80 5mm and110 5mm, respectively. The leader and trailer tape thickness shall be4m and the width shall be12,65 0,03mm. 5.3 Splicing Th
39、e splice and the attachment of the leader and trailer tape to the hub shall be capable of resisting a force of30N. The splicing gap shall be less than0,07mm. 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. 2
40、0 +2 6EN61077:1991 BSI 01-2000 5 NOTE 1All ridges on the cassette body may be less than R0,5mm orC0,5mm. NOTE 2Top label area. NOTE 3Window for supply reel. NOTE 4Guide groove When the gauge, having dimensions of the groove on the lower case, is inserted into the groove from the bottom, it shall not
41、 contact the walls of the corresponding groove in the upper case. NOTE 5The distance is shown when the front cover is in the normal opening position. NOTE 6Maximum value when the front cover is fully opened. NOTE 792 0,3mm for the type of front cover without a locking-structure. NOTE 8The “A” length
42、 of the front cover shall be smaller than the cassette length by within0,6mm. NOTE 9For the front cover unlocking device, refer to Figure 2, note11. Figure 1 Complete cassette case(1)EN61077:1991 6 BSI 01-2000 NOTE 1Side label area. NOTE 2Erasure prevention tab area The depth of the recess shall be2
43、,5mm. NOTE 3Groove corresponding to the unlocking pin for reel brake shown in note4 of Figure2 of IEC774. NOTE 4Datum holes. NOTE 5Groove to prevent misinsertion, corresponding to the guide groove shown in note6 of Figure2 of IEC774. NOTE 6Supply reel. NOTE 7Take-up reel. NOTE 8Auxiliary hole positi
44、ons The depth of the recess shall be2,5mm. NOTE 9Screw locations for securing upper and lower cases. NOTE 10Area for identification This identification shall not protrude from the bottom surface. NOTE 11Front cover unlocking device intended only for the type of front cover with a locking-structure.
45、Figure 2 Complete cassette case(2)EN61077:1991 BSI 01-2000 7 Figure 3 Cassette lower half(1)EN61077:1991 8 BSI 01-2000 NOTE 1Take-up reel brake mounting boss. NOTE 2Supply reel brake. NOTE 3Centre of tape guide rollers. NOTE 4Radius R21 shows reel movable limit No obstruction is permitted within the
46、 limit of the cassette while the reel is turning. NOTE 5Radius R24 shows reel movable limit No obstruction is permitted within the limit of the cassette while the reel is turning. Figure 4 Cassette lower half(2)EN61077:1991 BSI 01-2000 9 NOTE 1Front cover turning axis. NOTE 2The dimension indicated
47、for releasing BB(G) may be0mm when dimension (H) is20 0,2mm Figure 5 Cassette upper halfEN61077:1991 10 BSI 01-2000 NOTE 1The cassette reference plane is an imaginary plane which includes the two points located2mm over the two rear datum points and one of the two front datum points. NOTE 2The casset
48、te bottom surface shall be between+0,1mm (convex) and0,2mm (concave) relative to the reference plane. NOTE 3The molding gate, if necessary on this surface, shall be positioned within this area. Figure 6 Cassette reference planeEN61077:1991 BSI 01-2000 11 NOTE 1F 1 , F 2 : Force necessary to open the
49、 front cover at each position when unlocked. NOTE 2Locking and unlocking position of the front cover. NOTE 3F 3 : Force necessary to open the front cover when locked. NOTE 4Locking and unlocking position of unlocking pin. NOTE 5F 4 : Force necessary to push to the unlocking position. NOTE 6F 5 : Force necessary to push to the surface of the cassette wall. NOTE 7End position of the stud for locking the front cover. Figure 7 Front cover with locking-structureEN61077:1991 12 BSI 01-20
