1、 1 Scope This standard specifies dimensions for three sizes of cassettes (S, M, and L) for use with 1/2-in type magnetic tape cassette for television digital recorders (see annex B). 2 Measurements Tests and measurements on cassette parameters shall be carried out under the following atmospheric con
2、ditions: Temperature (20 1)C Relative humidity (50 2)% Barometric pressure 86 kPa to 106 kPa Stabilization time 24 hours 3 Video tape cassette 3.1 General specifications 3.1.1 The dimensions of the three different cassettes used for recording shall be in accordance with figures 1 to 21. Small- and m
3、edium-size cassettes shall utilize reels with 30-mm and 50-mm hub diameter sizes. Large-size cassettes shall use reels with a 44-mm hub diameter. Both hubs within the cassette shall be the same size. 3.1.2 General tolerances for dimensions, except those for which tolerances are otherwise specified,
4、shall be as indicated in table 1. 3.1.3 The three sizes of cassettes shall be identified as: Small: S Medium: M Large: L 3.1.4 Tape length, thickness, and play times for the three cassette sizes shall be as given in table 2. 3.1.5 The magnetic coating on the tape shall face out of the cassette as sp
5、ecified in figures 1 to 3. Page 1 of 42 pages SMPTE 263M-2004 Revision of ANSI/SMPTE 263M-1996 Copyright 2004 by THE SOCIETY OF MOTION PICTURE AND TELEVISION ENGINEERS 595 W. Hartsdale Ave., White Plains, NY 10607 (914) 761-1100 ApprovedFebruary 3, 2004SMPTE STANDARD for Television Digital Recording
6、 1/2-in Type Magnetic Tape Cassette SMPTE 263M-2004 Page 2 of 42 pages Table 1 Mechanical tolerances Over To Tolerance mm 0 4 16 63 250 4 16 63 250 0.15 0.2 0.25 0.3 0.4 Table 2 Tape thickness, length of tape in S, M, and L cassettes Tape cassette Hub diameter mm Thickness m Length m S M L 30 50 30
7、50 44 11/14 11/14 11/14 11/14 11/14 325/254 204/163 632/481 506/405 1237/935 3.2 Datum planes 3.2.1 Datum plane Z is determined by datum areas A, B, and C as specified in figures 4 to 6. 3.2.2 Datum area C need not correspond with a fastener. 3.2.3 Datum plane X shall be orthogonal to datum plane Z
8、and shall run through the center of datum hole (a) and datum hole (b) as specified in figures 7 to 9. 3.2.4 Datum plane Y shall be orthogonal to both datum plane X and datum plane Z and shall run through the center of datum hole (a) as specified in figures 7 to 9. 3.2.5 The light path shall be as sp
9、ecified in figures 10 to 12. 3.2.6 The cassette positioning surface shall be as specified in figures 13 to 15. 3.3 Window and labels 3.3.1 Window and label areas shall be as specified in figures 16 to 18. 3.3.2 Labels attached to the cassette shall not extend beyond the external dimensions as shown
10、in figures 16 to 18. 3.3.3 Labels shall not interfere with the identification holes of the users or the manufacturers. 3.3.4 Labels shall not interfere with the hub drive and support mechanism. 3.4 Identification holes 3.4.1 There shall be two sets of identification holes; one for the use of the man
11、ufacturer, and the other for the user. SMPTE 263M-2004 Page 3 of 42 pages 3.4.2 The dimensions and location of manufacturers coding holes, detailed in figures 19 to 21, shall be defined as follows: Holes 1, 2, and 3 shall be used in combination to indicate tape thickness and diameter of hub accordin
12、g to table 3. Table 3 Identification holes Hole number (1) (2) (3) 0 0 0 Class 1600, 11-m tape, 30-mm diameter hub 0 0 1 Class 1600, 11-m tape, 50-mm diameter hub 0 1 0 Class 1600, 14-m tape, 30-mm diameter hub 0 1 1 Class 1600, 14-m tape, 50-mm diameter hub 1 0 0 Class 1800, 11-m tape, 30-mm diamet
13、er hub 1 0 1 Class 1800, 11-m tape, 50-mm diameter hub 1 1 0 Class 1800, 14-m tape, 30-mm diameter hum 1 1 1 Class 1800, 14-m tape, 50-mm diameter hub NOTES 1 A 1“ in the above table indicates that the indicator tab was removed or open, which results in an undetected state by the recorder/player sen
14、sor mechanism. 2 The large cassette uses only 44-mm hub. The identification for large cassettes use only hole number (1) and (2) and the actual size of the cassette defined in figure 9 3.4.3 The dimensions and location of the users coding holes, detailed in figures 19 to 21, shall be defined as foll
15、ows: When a 1“ state exists, the user holes shall identify the following conditions: User hole a: total record lock out (audio/video/cue/time code/control track); User hole b: video and control track record lock out; User hole c: reserved and undefined.1) ( 1)May also be used to indicate number of a
16、udio tracks for type D-14 and D-15 formats; see annex A. ) 3.4.4 The user plug mechanism shall withstand an axial force of 0.5 N. 3.4.5 The color of the user plug shall be red. 3.5 Leader/trailer tape 3.5.1 The cassette shall include leader and trailer tape. When attached to the hub, the length betw
17、een the splice point and the clamping point on the reel hub shall be as specified in table 4. Table 4 Length of leader and trailer tape Cassette size Hub diameter mm S and M mm L mm 30 165 10 44 180 10 50 155 10 SMPTE 263M-2004 Page 4 of 42 pages Dimensions in millimeters NOTES 1 Dimensions with an
18、asterisk are nominal values specifying the tape path. 2 Dimensions in parentheses are for reference only. 3 Diameter specifies the minimum clearance for the reel flange. 4 The maximum excursion limits for machine tape guides ensure that there is no tape contact with cassette components. Figure 1 Top
19、 view, inner structure and tape path of S cassette SMPTE 263M-2004 Page 5 of 42 pages Dimensions in millimeters NOTES 1 Dimensions with an asterisk are nominal values specifying the tape path. 2 Dimensions in parentheses are for reference only. 3 Diameter specifies the minimum clearance for the reel
20、 flange. 4 The maximum excursion limits for machine tape guides ensure that there is no tape contact with cassette components. Figure 2 Top view, inner structure and tape path of M cassette SMPTE 263M-2004 Page 6 of 42 pages Dimensions in millimeters NOTES 1 Dimensions with an asterisk are nominal v
21、alues specifying the tape path. 2 Dimensions in parentheses are for reference only. 3 Diameter specifies the minimum clearance for the reel flange. 4 The maximum excursion limits for machine tape guides ensure that there is no tape contact with cassette components. Figure 3 Top view, inner structure
22、 and tape path of L cassette SMPTE 263M-2004 Page 7 of 42 pages Dimensions in millimeters NOTES 1 The periphery within 1.0 mm from the edge of guiding groove B and from the edge of the cassette shall not be used as the support area. The cassette shall be supported by the recorder and/or player unit
23、on the hatched area. 2 Datum plane Z shall be determined by datum areas A, B, and C. 3 Change grip for automatic changing machine. Figure 4 Datum area, support area and change grip area of S cassette SMPTE 263M-2004 Page 8 of 42 pages Dimensions in millimeters NOTES 1 The periphery within 1.0 mm fro
24、m the edge of guiding groove B and from the edge of the cassette shall not be used as the support area. The cassette shall be supported by the recorder and/or player unit on the hatched area. 2 Datum plane Z shall be determined by datum areas A, B, and C. 3 Change grip for automatic changing machine
25、. 4 “Cutout” is not mandatory. Figure 5 Datum area, support area and change grip area of M cassette SMPTE 263M-2004 Page 9 of 42 pages Dimensions in millimeters NOTES 1 The periphery within 1.0 mm from the edge of guiding groove B and from the edge of the cassette shall not be used as the support ar
26、ea. The cassette shall be supported by the recorder and/or player unit on the hatched area. 2 Datum plane Z shall be determined by datum areas A, B, and C. 3 Change grip for automatic changing machine. 4 “Cutout” is not mandatory. Figure 6 Datum area, support area and change grip area of L cassette
27、SMPTE 263M-2004 Page 10 of 42 pages Dimensions in millimeters Figure 7 Bottom view of S cassette SMPTE 263M-2004 Page 11 of 42 pages Dimensions in millimeters NOTE “Cutout” is not mandatory. Figure 8 Bottom view of M cassette SMPTE 263M-2004 Page 12 of 42 pages Dimensions in millimeters NOTE “Cutout
28、” is not mandatory. Figure 9 Bottom view of L cassette SMPTE 263M-2004 Page 13 of 42 pages Figure 10 Light path of S cassette Figure 11 Light path of M cassette SMPTE 263M-2004 Page 14 of 42 pages Figure 12 Light path of L cassette Dimensions in millimeters Figure 13 Cassette positioning surface of
29、S cassette SMPTE 263M-2004 Page 15 of 42 pages Figure 14 Cassette positioning surface of M cassette Dimensions in millimeters Figure 15 Cassette positioning surface of L cassette SMPTE 263M-2004 Page 16 of 42 pages NOTES 1 Side label may be attached to this recessed area. 2 Rear label may be attache
30、d to this recessed area. 3 Top label may be attached is this recessed area. Figure 16 Top and side views of S cassette SMPTE 263M-2004 Page 17 of 42 pages NOTES 1 Side label may be attached to this recessed area. 2 Rear label may be attached to this recessed area. 3 Top label may be attached is this
31、 recessed area. Figure 17 Top and side views of M cassette SMPTE 263M-2004 Page 18 of 42 pages NOTES 1 Side label may be attached to this recessed area. 2 Rear label may be attached to this recessed area. 3 Top label may be attached is this recessed area. Figure 18 Top and side views of L cassette S
32、MPTE 263M-2004 Page 19 of 42 pages Dimensions in millimeters NOTES 1 The cassette shall be provided with three coding holes (1) to (3) and three user holes (a) to (c). 2 User holes (a) to (c) on the upper shell shall be opened when user plugs are removed. 3 All cassettes shall be provided with holes
33、 as defined by sections AA, BB, and CC. Figure 19 S cassette coding holes and user holes SMPTE 263M-2004 Page 20 of 42 pages Dimensions in millimeters NOTES 1 The cassette shall be provided with three coding holes (1) to (3) and three user holes (a) to (c). 2 User holes (a) to (c) on the upper shell
34、 shall be opened when user plugs are removed. 3 All cassettes shall be provided with holes as defined by sections AA, BB, and CC. Figure 20 M cassette coding holes and user holes SMPTE 263M-2004 Page 21 of 42 pages Dimensions in millimeters NOTES 1 The cassette shall be provided with three coding ho
35、les (1) to (3) and three user holes (a) to (c). 2 User holes (a) to (c) on the upper shell shall be opened when user plugs are removed. 3 All cassettes shall be provided with holes as defined by sections AA, BB, and CC. Figure 21 L cassette coding holes and user holes SMPTE 263M-2004 Page 22 of 42 p
36、ages 3.5.2 The leader/trailer tape material shall be polyester or equivalent having a transmissivity of at least 50% when measured with an 800-nm to 900-nm light source. 3.5.3 When attached to the hub, the leader/trailer tape shall not separate when subjected to a force of 20 N or less. 3.5.4 The wi
37、dth of the leader/trailer tape shall be 12.650 mm 0.020 mm. 3.5.5 The thickness of the leader/trailer tape shall be 14 m to 36 m. 3.5.6 The splicing tape used to attach the leader/trailer tape shall be applied to the nonmagnetic coated side. 3.6 Reels 3.6.1 The dimensions of the reels and the relati
38、onship between the reels and reel tables shall be as specified in figures 22 to 29. 3.6.2 The reels shall be locked automatically when the cassette is removed from the recorder/player. The number and shape of the teeth as well as the locking mechanism are not specified. 3.6.3 When a cassette is inse
39、rted into the recorder/player, the reels shall be unlocked automatically by the lighthouse as specified in figure 30. The force needed to release the reel lock shall be less than 1.0 N. 3.6.4 The reels shall be held in position by a reel spring with a force as shown in table 5, when the height of th
40、e reel table support is 2.0 mm 0.1 mm from datum plane Z as shown in figures 27 to 29. Table 5 Reel spring force Cassette size Force S M L 2.5 0.3 N 3.5 0.3 N 4.0 0.3 N 3.7 Lid 3.7.1 The lid shall be unlocked and opened by the recorder/player when the cassette is inserted. 3.7.1.1 The lid shall be u
41、nlocked by a force of less than 0.3 N exerted upon the release pin, as specified in figures 31 to 33. 3.7.1.2 The inner door shall be lifted by the recorder/player to the position shown in figure 34. 3.7.1.3 The outer door shall be lifted by the recorder/player to the position shown in figures 35 to
42、 37. 3.7.2 The minimum space of cassettes for the VTR loading mechanism shall be as shown in figure 38. The shaded area of figure 38 is intended to indicate to VTR manufacturers the area available for loading (threading) the tape. Note that the dimensions defining this space are not cassette dimensi
43、ons. 3.7.3 When open, the outer door shall not exceed 37 mm with respect to datum plane Z. Angle between the front side surface and datum plane X shall be 93 2, as specified in figure 39. 3.7.4 When the cassette is removed from the recorder/player, the lid shall lock automatically. 3.7.5 The maximum
44、 force to open the lid shall be less than 1 N for S and M cassettes and 1.5 N for L SMPTE 263M-2004 Page 23 of 42 pages cassettes up to the 25-mm minimum height defined in figure 39. 3.7.6 The force required to open the lid shall be applied 90 +5 0 to datum plane Z at the opening and closing areas a
45、s shown in figures 34 to 37. NOTE The center of the reel and the reel table shall be positioned on either the center of the area 30.00 mm 0.15 mm in diameter or the center of the area 48.0 mm +0 mm 0.3 mm in diameter. Figure 22 Video cassette reel of 30-mm hub of S cassette SMPTE 263M-2004 Page 24 o
46、f 42 pages NOTE The center of the reel and the reel table shall be positioned on either the center of the area 30.00 mm 0.15 mm in diameter or the center of the area 48.0 mm +0 mm 0.3 mm in diameter. Figure 23 Video cassette reel of 30-mm hub of M cassette SMPTE 263M-2004 Page 25 of 42 pages Dimensi
47、ons in millimeters NOTE The center of the reel and the reel table shall be positioned on either the center of the area 30.00 mm 0.15 mm in diameter or the center of the area 48.0 mm +0 mm 0.3 mm in diameter. Figure 24 Video cassette reel of 50-mm hub of S cassette SMPTE 263M-2004 Page 26 of 42 pages
48、 Dimensions in millimeters NOTE The center of the reel and the reel table shall be positioned on either the center of the area 30.00 mm 0.15 mm in diameter or the center of the area 48.0 mm +0 mm 0.3 mm in diameter. Figure 25 Video cassette reel of 50-mm hub of M cassette SMPTE 263M-2004 Page 27 of
49、42 pages Dimensions in millimeters NOTE The center of the reel and the reel table shall be positioned on either the center of the area 30.00 mm 0.15 mm in diameter or the center of the area 48.0 mm +0 mm 0.3 mm in diameter. Figure 26 Video cassette reel of L cassette SMPTE 263M-2004 Page 28 of 42 pages Dimensions in millimeters Figure 27 Relationship between reel and large reel table of S and M cassettes SMPTE 26
