1、 SMPTE 24M 96 8357403 0002348 T77 SMPTE STANDARD for Television Recording - I-in Reels ANWSMPTE 24M-1996 Revision of ANSKSMPTE 24M-1991 1 Scope This standard specifies the configuration and dimen- sions for reels intended for 1-in magnetic tape for television recording on helical-scan video recorder
2、s, as specified in ANSIISMPTE 25M. 2 Reel construction The method for fastening or the fasteners used to hold the flanges to the hub shall not cause protrusions beyond the hub mounting surface, The reel shall be symmetrical about the axis of rotation. Irregularities of configuration, such as flange
3、openings, shall con- form to this requirement. 3 Dimensions The dimensions shall be as shown in the figures and tables. The dimensions apply to reels normalized Page 1 of 4 pages at 23C Ir 1C and at 50% I 2% relative humidity. 4 Flange clearance With the reel mounted in the test apparatus, a width g
4、auge of 25.500 mm + 0.010 mm - 0.000 rnm (1 .O039 in + 0.0004 in - 0.0000 in) shall be mounted so the gauge centerline is 15.37 mm (0.605 in) from the hub mounting surface and at 90“ relative to the hub winding surface. The reel shall be rotated and the width gauges moved between the flanges from th
5、e flange rim to the hub surface. The width gauge shall not touch the flange during this operation. When the reel is turned over so that the other side of the hub is the reel mounting surface, it shall also pass tape path clearance check. CAUTION NOTICE: This Standard may be revised or withdrawn at a
6、ny time. The procedures of the Standard Developer require that action be taken to reaffirm, revise, or withdraw this standard no later than five years from the date of publication, Purchasers of standards may receive current information on all standards by calling or writing the Standard Developer.
7、Printed in USA. Copyright Q 1996 by THE SOCIETY OF L American National Standard MOTION PICTURE AND TELEVISION ENGINEERS (914) 761-1100 595 W Harkdale Ave., White Plains, NY i0607 Approved May 28,1996 SMPTE 24M 9b m 8357403 0002349 903 m ANSVSMPTE 24M-1996 B ENLARGED VIEW OF HUB SECTION (NOT TO SCALE
8、) Figure 1 - Reel for 1-in magnetic tape Page 2 of 4 pages - SMPTE 24M 96 m 8357403 0002350 b25 m ANSVSMPTE 24M-1996 Table 1 - Reel dimensions Dimensions Mi I I i mete rs Inches A B) C D E F G H J K2) LI) 2) M N P Q See table 2 114.30 * 0.25 82.55 I 0.05 + 0.15 5.56 - 0.00 2.77 R ref 120“ I 0.1“ 0.6
9、4 max 2.39 max 91.44 min 152.40 min 30.78 I 0.08 25.91 f 0.05 0.76 max 0.76 max Dia Dia Dia + 0.004 Dia 3.000 - 0.000 See table 2 4.500 I 0.010 Dia 3.250 5 0.002 Dia + 0.006 - 0.000 0.109 R ref 120“ I 0.1“ 0.025 max 0.094 max 3.600 min 6.000 min 1.212 k 0.003 1.020 f 0.002 0.030 max 0.030 max IOTES
10、) Outside surfaces of reel flanges between diameters L and i3 shall not extend more than 0.64 mm (0.025 in) beyond the surfaces defined by the actual dimension M. 2, Outside surfaces of reel flanges between diameters Kand Lshall not extend beyond the surfaces definec by the actual dimension M. Table
11、 2 - Dimension B, flange diameters Millimeters Inches 165.10 I 0.25 203.20 f 0.25 228.60 f 0.25 266.70 f 0.25 292.10 f 0.25 298.50 I 0.25 304.80 f 0.25 317.50 f 0.25 355.60 f 0.25 6.500 + 0.010 8.000 k 0.010 9.000 f 0.010 10.500 f 0.010 11.500 f 0.010 11.752 I 0.010 12.000 I 0.010 12.500 k 0.010 14.
12、000 + 0.010 NOTES 1 Reel shall meet tape clearance requirements when mounted on either side. 2 Tape path clearance takes precedence over any tolerance buildup. See clause 4 for measurement technique. Page 3 of 4 pages SMPTE 24M 96 8357403 0002353 561 ANSVCMPTE 24M-1996 TAPE PATH CLEARANCE FOR COMPLE
13、TE ROTATION CENTERLINE OF SPACE FOR TAPE PATH 115.37 (0.605) I- Annex A (informative) Reel identification I -112.75 (0.502) 1 It -+I A C I -C- I I /d I 0.041 (0.0016 1 1 Figure 2 - Clearance Annex B (informative) Bibliography It is recommended that reels be identified in a manner making it readily apparent that they contain video tape in order to prevent inadvertent use of other types of tape having a similar appearance. ANSVSMPTE 25M-1995, Video Recording - 1-in Magnetic Recording Tape Page 4 of 4 pages
