IEC 62356-1 pdf download – Video recording – 12,65 mm TYPE D-11 format – Part 1: Tape recording

IEC 62356-1 pdf download – Video recording – 12,65 mm TYPE D-11 format – Part 1: Tape recording
5.1.1 Tape thickness
The tape thickness shall be from 12,5 um to 13,8 um.5.1.2Offset yield strength
The offset yield strength shall be greater than 15 N.
5.1.3 Magnetic coating
The magnetic tape used shall have a coating of metal particles or equivalent,longitudinallyoriented.The coating coercivity shall be in the range of 120 000 A/m to 140 000 A/m,with anapplied field of 800 000 A/m (10 000 oersted) as measured by a 50 Hz or 60 Hz BH meter orvibrating sample magnetometer (vSM).
5.2cassette specifications
5.2.1Cassette dimensions
Two sizes of cassettes shall be identified as follows:s cassette
96 x 156× 25 mm
As shown in Figures 1 to 13
L cassette
145 ×254 ×25 mm
As shown in Figures 14 to 26
5.2.2Tape length and recording time
Maximum tape length and recording time are recommended as follows:s cassette
241 m 2 m
40 min for
48 min for
50 min for
50 min for
29,97PsF159,941
25PsF150l
24PsF
23,98PsF
L cassette
732 m 2m 124 min for
148 min for
155 min for
155 min for
29,97PsF759,94l
25PsF/501
24PsF
23,98PsF
5.2.3Datum planes
Datum plane Z shall be determined by three datum areas，A,B and C, as shown in Figures 3aand 16a.Datum plane X shall be orthogonal to datum plane Z and shall include the centres ofdatum holes (a) and (b). Datum plane Y shall be orthogonal to both datum plane X and datumplane Z and shall include the centre of datum hole (a) as shown in Figures 2 and 15.
5.2.4Tape winding
The magnetic coating side of the magnetic tape shall face outside on both the supply reel andthe take-up reel as shown in Figures 4 and 17.
5.2.5 Label area and window area
The hatched areas shown in Figures 1 and 14 are for the label and window.Labels attachedto the cassette shall not protrude above the outside cassette surface plane.
5.2.6Guiding groove
For correct insertion into the VTR, four guiding grooves for S cassettes,as shown in Figures 1and 2, and three guiding grooves for L cassettes, as shown in Figure 15, shall be provided.
5.2.7Safety tab and safety plug for recording inhibition
For s cassettes,a safety plug at the supply reel side and a hole of minimum depth 10 mmfrom datum plane Z at the take-up reel side shall be provided as shown in Figure 2.
For L cassettes, a safety plug shall be provided at the take-up reel side as shown in Figure15.
The safety plug shall not be deformed by 0,3 mm or more when a force of 2,0 N(204 gf) isapplied to the centre of it, using a 2,5 mm diameter rod.See Figures 12 and 25.
5.2.8ldentification holes
six identification holes (holes 1 to 6) shall be located as specified in Figures 2 and 15.Forthis format, holes 1,2,3,4 and 6 shall be closed.Hole 5 shall be open.
5.2.9 Reels
5.2.9.1 Reel lock system
The reels shall be automatically unlocked when the cassette is inserted into the video taperecorder and/or player unit and automatically locked when the cassette is ejected from it.
The locations of the reels when in the unlocked position are shown in Figures 4 and 17,Dimensions of the reels are shown in Figures 6 and 19.Heights of the reels are shown inFigures 7 and 20.
The reel shall be completely released when the cassette lid is opened 23,5 mm minimum fromdatum plane Z.
5.2.9.2Reel spring force
The reels assembled in the cassette shall be pressed by the reel spring with a specified forceunder the conditions specified in Figures 11 and 24.The spring force shall be 1,5 N ±0,5 N(153 gf ± 51 gf) for S cassettes and 3,5 N ± 0,5 N (357 ‘gf 主 51 gf) for L cassettes whenpressing on a reel 2,4 mm above datum plane Z as shown in Figures 11 and 24.
5.2.9.3Extraction force
The force (F1，F2) required to pull the tape out from the reel shall not exceed 0,17 N (17 gf).as specified in Figures 13a and 26a.
5.2.9.4Friction torque
The torque required to wind the tape shall be less than 15 mN m (152 gf cm) for S cassettesand less than 30 mN m (305 gf cm) for L cassettes, as specified in Figures 13b and 26b.
5.2.10Protecting lid
The cassette lid shall be automatically unlocked when the cassette is inserted into the videotape recorder and/or player unit and automatically locked when the cassette is ejected from it.
The unlocking lever insertion area is specified in Figures 8 and 21.The lid shall be unlockedwhen the lid lock lever is shifted in either direction A or B,as illustrated in Figures 9 and 22,The force required to unlock the lid shall be less than 1 N (101 gf) in the A direction or lessthan 1,5 N(152 gfy in the B direction.