1、SUPTE 212U 95 8357403 0002045 535 SMPTE STANDARD ANSVSMPTE 212M-1995 Revision of ANSIISMPTE 212M-1984 for Motion-Picture Equipment (8-mmType S) - Projection Reels - 75-mm Diameter 1 Scope Page 1 of 4 pages dimensions Q, R4, and R5 and/or W, Rs, and R7 in figure 1. This standard specifies the dimensi
2、ons of 8-mm type S motion-picture projection reels of 75-mm (2.95-in) diameter with a nominal film capacity of 15 m (50 ft) generally used for returning the film from the processing laboratory. The reels fit reel-to-reel 2.4.2 When the retention means is utilized, it shall retain a polyester film of
3、 0.1 mm (0.004 in) thickness when a tension of 5 N (18 oz-f) is applied in a radial direction. equipment and are interchangeable in projection cassettes. 2.5 The rings defined by dimensions F, G, and O are guiding means for horizontal operation of 2 Dimensions the reel. 2.1 The dimensions shall be a
4、s given in the figures and tables. 2.6 Maximum lateral and radial runouts are given in figure 2 and table 2. 2.2 The dimensions shall apply regardless of the material (generally plastic) used for construc- tion. 2.3 The reel shall be designed with at least one solid flange (see figure l), with the e
5、xception of the hub area. By definition, the solid flange should not contain openings such as thread-up slots. 2.4 Film attachment shall be provided by a slot in the reel hub, and a minimum cutout in the flange opposite the solid flange shall be provided for each access to the film end. In order to
6、secure the end of the film to the reel for automatic rewinding, a means of film retention, such as a special retention plug or clip, shall be provided (see dimensions S and T in figure 1). 2.4.1 For reel-to-reel operation, the retention means shall not protrude beyond dimensions O + J + O. For proje
7、ction cassette operation, if a plug or clip is used, it shall not protrude beyond 2.6.1 The primary datum reference plane of rotation is defined with the surface of a flat 25.0-mm (0.98-in) diameter support which is centered on the spindle hole datum axis A. The reference surface makes contact with
8、the reel in the minimum I-diameter area. The datum axis, which is perpendicular to the primary datum reference plane of rotation, does not necessarily coincide with the axis derived from the center of the spindle holes. 2.6.2 Dimensions Ui, U2, U3, and U4 are measured at the periphery of the flanges
9、 and are the allowable lateral distances from the datum reference plane when the reel is rotated on a test spindle. 2.6.3 Dimensions VI and Vp specify the radial runout of the flanges and hub, respectively. These dimensions exceed dimensions M and E by 0.5 mm (0.02 in) to allow for eccentricity of t
10、he spindle holes, hub, and flanges. CAUTION NOTICE This Standard may be revised or withdrawn at any 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
11、 may receive current information on all standards by calling or writing the Standard Developer Printed in USA - American National Standard CopynghtO 1995 by THE SOCIETY OF MOTION PICTURE AND TELEVISION ENGINEERS 595 W Harisdale Ave., White Plains, NY 10607 (914) 761-1100 Approved September 12,1995 S
12、MPTE 232M 95 8357403 O002046 451 ANSLISMPIE 212M-1995 E h I 1 Page 2 of 4 pages SMPTE 2121 95 8357401 0002047 398 ANSVSMPTE 212M-1995 Table 1 - Specifications Mi I I i meters Inches Dimensions B C D J Ki) L M O P1 Po P3 Q Ri Ra R32) R4 R5 Rs + 0.3 1.5 - 0.0 0.06 :o; + 0.15 + 0.006 12.75 - 0.00 - 0.0
13、00 32.5 f 0.5 32.5 f 0.5 36.6 m ax 33.5 f 0.5 + 0.5 30.0 - 0.0 10.9 f 0.3 8.4 min + 0.3 + 0.0 + 0.13 - 0.25 8.4 - 0.0 74.9 - 1.0 120“ I 2“ 120“ f 2“ 45“ f 2“ 4.3 m ax 1 .o m ax BI2 m ax 0.5 m ax 15.0 m ax 11.25 min 10.92 min 0.81 : 1.28 k 0.02 1.28 f 0.02 1.44 max 1.32 k 0.02 + 0.02 l.18 - 0.00 0.43
14、 I 0.01 0.33 min 0.33 + 0.00 295 - 0.04 + 0.005 o.o2o - 0.010 0.17 max 0.04 max b12 m ax 0.02 m ax 0.59 max 0.443 min 0.430 min R7 16.0 max 0.63 max S T W 11.9 min 6.1 min 0.8 max 0.47 min 0.24 min 0.03 max ) At hub. If metal flanges are used, there should be no burr on the flange periphery. Page 3
15、of 4 pages SMPTE 232M 9.5 8357403 0002048 224 = ANSVCMPTE 212M-1995 DATUM AXIS fsee 2.6 1 Figure 2 - Maximum volume of rotation (not intended as a true view or section figure) Table 2 - Maximum runout dimensions Dimensions Millimeters inches u1 0.65 max 0.026 max u2 1.10 max 0.043 max 9.50 min 0.374 min u3 11.75 max 0.463 max u4 Vi 75.4 max 2.97 max Va 33.5 max 1.32 max Page 4 of 4 pages
