1、SMPTE RP*349 92 O 8357403 0000272 520 SMPTE RECOMMENDED PRACTICE imensions ot -rransverse Cemented Splices on 16-mm and 8-mrn Type R Motion-Picture Film RP 149-1992 Revision of RP 149-1988 1 Scope 1.1 Specifications This practice specifies the dimensions of transverse cemented splices on 16-mm and 8
2、-mm type R motion- picture film. 1.2 Types Two types of splices are specified: a laboratory splice for professional applications and a projection splice for release prints and consumer or amateur reversal films. 1.3 Excepted splicers It is not intended that this practice be prejudicial to diagonal,
3、scarf, or tape splicers. 2 Dimensions 2.1 Specifications The dimensions shall be as given in the figures and tables. Page i of 3 pages 2.2 Film width at splice Film width at the splice shall not exceed 0.317 in (8.05 mm) for 8-mm type R film and 0.630 in (16.00 mm) for 16-mm film. If the film has be
4、en widened during scraping, fhe extra width shall be removed. 2.3 Laterat offset for perforation overlap Perforation overiapping shall not be offset laterally by more than 0.002 in (0.05 mm). 2.4 Lateral offset for film edges Edges of the two spliced films shall not be offset laterally by more than
5、0.002 in (0.05 mm) un- less a difference in the laferal shrinkage of the two strips makes it impossible to maintain the tolerance. Shoulders formed by such misalignment shalt be beveled after the cement has dried. 2.5 Angle between eges In the plan view, the angle between the respective edgesof the
6、splicedfilms shall be 180“ r4. Thus, the spliced film shall be aligned to the extent that, when one portion of the film is placed against a straightedge, the other portion wilt not deviate more than 0.006 in (0.15 mm), which is the approximate film thickness, in 6 in (152 mm). Copyright O 1992 by th
7、e SOCIETY OF MOTION PICTURE AND TELEVISION ENGINEERS 595 W. Hartsdale Ave., White Plains, NY 10607 Approved September 18,1992 (914) 761-1100 RP 149-1992 SMPTE RPS349 92 fl 8357403 0000273 467 + t b E - FILM TRAVEL G Figure t - Laboratory splices Table i - Laboratory splice specifications c I t - c F
8、ILM TRAVEL Figure 2 - Prqjection splices Table 2 - Projection splice specifications ! Dimensions Inches Millimeters I / Dimensions Inches Millimeters A 0.070 f 0.003 1.78 f 0.08 B 0.548 I 0.001 13.92 f 0.03 i C 0.344 f 0.003 8.74 f 0.08 D + 0.000 + 0.00 1 696 - 0.08 : i - 0.003 0.05 max I E 0.012 ma
9、x G 0.002 max + 0.000 + 0.00 2*54 - 0.13 o1oo - 0.005 0.548 0.001 13.92 f 0.03 I B1 1 ci -k 0.000 + 0.00 - 0.003 823 -0.08 + 0.000 + 0.00 8.23 - 0.08 0.324 - 0.003 EI 0.012 max 0.30 max I GI 0.002 max 0.05 rnax INOTE -Tolerances shown are not to be cumulative. I NOTE -Tolerances shown are not to be
10、cumulative. Page 2 of 3 pages SMPTE RP*:L49 92 EJ 8357403 0000274 3T3 E RP 149-1992 Annex A (informative) Explanatory notes A.l Dimension B (or Bi) Dimension B (or BI) controls the longitudinal registration of the two films being spliced. It is measured to the perforations that are most commonly use
11、d for registration on splicing blocks, and to the nearer edges of these perforations, which are generally used for registration. A.2 Dimensions C and D Dimensions C and D were chosen to give a splice which has one edge along the frameline. This provides the so- called invisible splice when printing
12、A and B rolls of original photography. A.3 Orienting the films It is desirable to orient the films in splicing so that a mag- netic head scanning the film would, ai a splice, drop down onto the trailing film rather than bump up onto if. A.4 Preventing white line In order to prevent the appearance of
13、 a white line on the screen, the scraped area should be 0.001 in to 0.003 in (0.03 mm to 0.08 mm) narrower than the area covered by the overlapping film. Presence of this narrow uncemented area will not shorten the life of the splice. A.5 Striped film If the film being spliced contains a stripe, the
14、 stripe must be removedfrom the base of the film falling on top of the mating piece. A.6 Splicing technique Emulsion and binder must be completely removed by scrap- ing in order to ensure a strong, long-lasting cement bond. The surface on the base side of the film to be joined must also be thoroughly cleaned. Sometimes it may be helpful to roughen the base surface slightly when certain films resist satisfactory splicing. Page 3 of 3 pages
