1、SMPTE STANDARD SMPTE 307M-2002 Revision of SMPTE 307M-1998 for Television Digital Recording - 6.35-mm Type D-7 and Type D-12 Component Format - TaDe Cassette Page 1 of 40 pages 1 Scope This standard specifies the dimensions for three types of 6.35-mm type D-7 and type 0-12 tape cassettes (M, L, and
2、EL) for use with digital recorders. NOTE -The cassette is used for more than a single recording format. The cassette provides no information to indicate the format of the recording contained on the tape within the cassette. 2 Measurements 2.1 Tests and measurements on cassette parameters shall be ca
3、rried out under the following atmospheric conditions: - Temperature: 20C f 1C - Relative humidity: (50 - Closed: Possible to record. 3.5 Tape type identification and cassette type detection 3.5.1 Identification board The dimensions and location of the identification board shall be as given in figure
4、s 12 to 14. The electrical characteristics shall be as given in tables 3 and 4 under the following conditions: - Each contact force of the connector shall be within 0.25 N to 0.4 N. - Each contact resistance of the connector shall be less than 0.5 ohms. The contact resistance shall be measured when
5、any value of DC current between 50 pA to 300 mA is applied. - Each conlaci impeaance ot the connector shall be less than 1.0 ohm. The contact impedance shall be measured when an AC current of 10 mA at 4 MHz is applied. Table 3 - Identif cation board for NI cassette Page 14 of 40 pages SMPTE 307M-200
6、2 Note 1 Contact element area Dimensions in millimeters NOTES 1 The contact element shall be located within the area indicated. 2 The activator shall not exceed the cassette surface. 3 The spacing between the contact element and the shell shall not exceed 0.3 mm. Figure 12 - Contact area of ID board
7、 for M cassette Page 15 o 40 pages SMPTE 307M-2002 Detail F Section B-B Note 1 Contact eienent area Dimensions in millimeters NOTES 1 The contact element shall be located within the area indicated. 2 The activator shall not exceed the cassette surface. 3 The spacing between the contact element and t
8、he shell shall not exceed 0.3 rnm. Figure 13 - Contact area of ID board for L cassette Page 16 of 40 pages SMPTE 3071111-2002 Note 1 :Contact element area Dimensions in millimeters NOTES 1 The contact element shall be located within the area indicated. 2 The activator shall not exceed the cassette s
9、urface. 3 The spacing between the contact element and the shell shall not exceed 0.3 mm. Figure 14 - Contact area of ID board for EL cassette Page 17 of 40 pages SMPTE 307M-2002 EL 3.5.2 Cassette-type detection hole 82 f 10 The dimensions and location of the cassette-type detection hole, detailed in
10、 figures 10 and 11, shall be as follows: - Open: EL cassette with 6.7 pm thick tape; - Closed: L cassette with 8.8 pm thick tape. 3.6 LeaderArailer tape 3.6.1 The light path shall be as specified in figures 15 to 17 3.6.2 The cassette shall include a leader and trailer tape. When attached to the hub
11、, the length between the splice point and the clamping point on the reel hub shall be as specified in table 5 and figures 15 to 17. Table 5 - Length of leader and trailer tape Length 75k 10 80k 10 Cassette size 3.6.3 The leaderitrailer tape material shall be polyester or its equivalent having a tran
12、smissivity of at least 65% when measured with an 800 nm to 1000 nm light source. 3.6.4 When attached to the hub, the leaderitrailer tape shall not separate when subjected to a force of 4 N or less. 3.6.5 The width of the leaderitrailer tape shall be 6.35 mm + O mm - 0.05 mm. 3.6.6 The thickness of t
13、he leaderitrailer tape shall be 15 pm + O pm - 3 pm. The splicing tape used to attach the leaderitrailer tape shall be applied to the nonmagnetic coated side. 3.7 Reels 3.7.1 The dimensions of the reels and the relationship between the reels and reel tables shall be as specified in figures 18 to 20.
14、 3.7.2 The reels shall be locked automatically when the cassette is removed from the re- corderiplayer. The number and shape of the teeth as well as the locking mechanism shall be as specified in figures 21 to 23. 3.7.3 When a cassette is inserted into the recorderiplayer, the reels shall be unlocke
15、d automatically as specified in figures 21 to 23. The force needed to release the reel lock shall be less than 1.2 N. Page 18 of 40 pages CMPTE 307M-2002 w Light path Leader and troiier tape Dimensions in millimeters NOTES 1 The light path, as shown, shall be unobstructed when the lid is open beyond
16、 85“. 2 The light path aperture shall be a 2.0-mm minimum diameter hole, but shall not exceed a 2.9-mm square area. Figure 15 - Light path and leader/trailer tape for M cassette Page 19 of 40 pages SMPTE 307M-2002 _ Figure 10a Light path r Magnetic side Fiqure i0b Lender and trniler tape Dimensions
17、in millimeters NOTES 1 The light path, as shown, shall be unobstructed when the lid is open beyond 85“. 2 The light path aperture shall be a 2.0-mm minimum diameter hole, but shall not exceed a 2.9-mm square area. Figure 16 - Light path and leaderhailer tape for L cassette Page 20 of 40 pages SMPTE
18、307M-2002 II I Figure 100 Light path Fiaure iOb Lender and traiier tape Dimensions in millimeters NOTES 1 The light path, as shown, shall be unobstructed when the lid is open beyond 85“. 2 The light path aperture shall be a 2.0-mm minimum diameter hole, but shall not exceed a 2.9-mm square area. Fig
19、ure 17 - Light path and leaderhrailer tape for EL cassette Page 21 of 40 pages SMPTE 307M-2002 c O 1 1 a , Ratchet for reei lock -Note 5 Note 6/ Detail C Appearance A Note 3 n 4 1 N n te 4 “- M rh Reei table sumort area Dimensions in millimeters NOTES 1 All dimensioned tolerances for the reel drive
20、holes shall be maintained through a depth of 7.4 mm. 2 The height of the reel table. 3 The reel spring pressure force shall be within a range of 0.65 N to 1.15 N when the height of the reel table support area is 0.7 mm f 0.25 mm from datum plane Z. 4 The flange of the reel shall not contact the shel
21、l of the cassette when the height of the reel table is 0.7 mm k 0.25 mm from datum plane Z and the reel table is inclined by 30 minutes. 5 Datum plane W shall be defined by the circular area as indicated. 6 The serration of the reel flange shall not contain sharp edges. Figure 18 - Reels for M casse
22、tte Page 22 of 40 pages SMPTE 307M-2002 11.1 fais 4 Ratchet for reei Lock / Detail C Min.7.4 I Note 3 _ q - 5 Appearance A J Reei table support area Dimensions in millimeters NOTES 1 All dimensioned tolerances for the reel drive holes shall be maintained through a depth of 7.4 mm. 2 The height of th
23、e reel table. 3 The reel spring pressure force shall be within a range of 0.65 N to 1.15 N when the height of the reel table support area is 0.7 mm f 0.25 mm from datum plane 2. 4 The flange of the reel shall not contact the shell of the cassette when the height of the reel table is 0.7 mm f 0.25 mm
24、 from datum plane Z and the reel table is inclined by 30 minutes. 5 Datum plane W shall be defined by the circular area as indicated. 6 The serration of the reel flange shall not contain sharp edges. Figure 19 - Reels for L cassette Page 23 of 40 pages SMPTE 307M-2002 11.1 tu15 6.7 iton 3.05 t 0.05
25、oyO.- - _ - 0.2 +y (0.65) (0.65) I Appearance A Note 3 Note 6 J Detail C Dimensions in millimeters NOTES 1 All dimensioned tolerances for the reel drive holes shall be maintained through a depth of 7.4 mm. 2 The height of the reel table. 3 The reel spring pressure force shall be within a range of 0.
26、65 N to 1.15 N when the height of the reel table support area is 0.7 mm k 0.25 mm from datum plane Z. 4 The flange of the reel shall not contact the shell of the cassette when the height of the reel table is 0.7 mm 10.25 mm from datum plane Z and the reel table is inclined by 30 minutes. 5 Datum pla
27、ne W shall be defined by the circular area as indicated. 6 The serration of the reel flange shall not contain sharp edges. Figure 20 - Reels for EL cassette Page 24 of 40 pages SMPTE 307M-2002 Released position 3.8 10.2 A- I Locked position 3 Released position Dimensions in millimeters NOTE -The eng
28、aging point of the reel lock pin, when disengaged, and plane L of the reel lock located 44.1 mm from datum plane X must be clear of the 23-mm radius circle. Figure 21 - Reel lock and release for M cassette Page25of40pages SMPTE 307M-2002 l Locked position +- 1 Plane I Released Dosition Dimensions in
29、 millimeters NOTE -The engaging point of the reel lock pin, when disengaged, and plane L of the reel lock located 57.6 mm from datum plane X must be clear of the 30.8-mm radius circle. Figure 22 - Reel lock and release for L cassette Page 26 of 40 pages SMPTE 307M-2002 Reieased position e I Locked p
30、osition I Reieased position Dimensions in millimeters NOTE -The engaging point of the reel lock pin, when disengaged, and plane Lof the reel lock located 57.6 mm from datum plane X must be clear of the 30.8-mm radius circle. Figure 23 - Reel lock and release for EL cassette Page 27 of 40 pages CMPTE
31、 307M-2002 3.7.4 The reels shall be eld in position by a reel spring with force as sh in in table 6, whe the height of the reel table support is 0.7 mm f 0.25 mm from datum plane Z as shown in figures 18 to 20. Table6 - Reei spring force I Cassette size I Force I M L EL 0.9 N f 0.25 N 0.9 N f 0.25 N
32、 0.9 N f 0.25 N 3.8 Lid 3.8.1 The lid shall be unlocked and opened by the recorder/player when the cassette is inserted. 3.8.1.1 The lid shall be unlocked by a force of less than 0.2 N exerted upon each release member as specified in figures 24 and 25. 3.8.1.2 The inner door shall be lifted by the r
33、ecorder/player to the position shown in figures 26 and 27. 3.8.1.3 The outer door shall be lifted by the recorder/player to the position shown in figures 28 and 29. 3.8.2 The minimum space of cassettes for the video tape recording loading mechanism shall be as shown in figures 26 and 27. The shaded
34、area of figures 26 and 27 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 dimensions. 3.8.3 When open, the outer door shall not exceed 19.6 mm with respect to datum plane Z, as specified i
35、n figures 28 and 29. 3.8.4 When the cassette is removed from the recorder/player, the lid shall lock automatically. 3.8.5 The maximum force to open the lid shall be less than 1 N up to the 19.6-mm minimum height defined in figures 28 and 29. Page 28 of 40 pages SMPTE 307M-2002 Section B-B X directio
36、n Detoil D Release nenber Dimensions in millimeters NOTES 1 When the unlocking lever is in the crosshatched area, the lid locks shall be released. 2 Lid lock unlocking lever insertion area. 3 The cassette shall be provided with lid locks on the take-up side and the supply side. 4 The lid lock levers
37、 shall be stopped within 8.9 mm k 0.2 mm as indicated. 5 The loading mechanism shall be provided with unlocking levers for the lid locks on both sides. 6 The angle shall be effective to a height 3.2 mm min from the bottom of the cassette. 7 The unlocking lever shall be contained within the indicated
38、 area. 8 The lid lock shall not extend beyond the bottom of the cassette in any position. Figure 24 - Lock lid and release for M cassette Page 29 of 40 pages SMPTE 307M-2002 Section B-B m Detail C Dimensions in millimeters NOTES 1 When the unlocking lever is in the crosshatched area, the lid locks s
39、hall be released. 2 Lid lock unlocking lever insertion area. 3 The cassette shall be provided with lid locks on the take-up side and the supply side. 4 The lid lock levers shall be stopped within 9.7 mm k 0.2 mm as indicated. 5 The loading mechanism shall be provided with unlocking levers for the li
40、d locks on both sides. 6 The angle shall be effective to a height 3.2 mm min from the bottom of the cassette. 7 The unlocking lever shall be contained within the indicated area. 8 The lid lock shall not extend beyond the bottom of the cassette in any position. Figure 25 - Lock lid and release for L and EL cassettes I Page 30 of 40 pages
