SMPTE ST 171-2001 Motion-Picture Film (35-mm) Perforated 16-mm 3R (1-3-0).pdf

1、1 ScopeThis standard specifies the cutting and perforatingdimensions for 35-mm motion-picture film with 16-mmperforations in positions 1-3-0 and a perforation pitchof either 0.2994 in or 0.3000 in (7.605 mm or 7.620mm). The width of the 16-mm strip after processingand slitting is also specified.2 Di

2、mensions2.1 The dimensions shall be as given in figure 1and table 1.2.2 The dimensions pertain to a safety film asdefined in SMPTE 223M.for Motion-Picture Film (35-mm) Perforated 16-mm, 3R (1-3-0)Revision ofANSI/SMPTE 171-1996SMPTE 171-2001SMPTE STANDARDPage 1 of 2 pagesApprovedJune 6, 2001Copyright

3、 2001 by THE SOCIETY OF MOTION PICTURE AND TELEVISION ENGINEERS595 W. Hartsdale Ave., White Plains, NY 10607(914) 761-1100Dimensions Inches MillimetersA Film width 1.377 0.001 34.975 0.025A Film width after processing and slitting 0.627 0.002 15.93 0.05B Perforation pitch (long) 0.3000 0.0004 7.620

4、0.010B Perforation pitch (short) 0.2994 0.0004 7.605 0.010C Perforation width 0.0720 0.0004 1.829 0.010D Perforation height 0.0500 0.0004 1.270 0.010E Reference edge to first perforation row 0.0355 0.0020 0.902 0.051E Edge to perforation after processing and slitting 0.0355 0.0020 0.902 0.051G Perfo

5、ration misalignment 0.001 max 0.03 maxL 100 consecutive perforation pitches 30.00 0.03 762.0 0.8L 100 consecutive perforation pitches 29.94 0.03 760.5 0.8M Reference edge side of first perforation row tosecond perforation row0.628 0.00115.95 0.03N Reference edge side of first perforation row tothird

6、 perforation row 1.234 0.00131.34 0.03R Radius of perforation fillet 0.010 0.001 0.25 0.03Table 1 SpecificationsFigure 1 DimensionsSEE NOTE 2REAFFIRMED 20062.3 Except for dimensions A and E, the dimen-sions apply at the time of cutting and perforatingfor film adjusted to a temperature of 23C 1C(nomi

7、nally converted to 73F 2F) and a relativehumidity of (50 2)%. The manufacturer mayindicate other nominal temperature and humidityconditions under which the dimensions apply.Dimensions A and E apply immediately afterslitting.NOTES1 The title of this standard was established by the applica-tion of a n

8、omenclature system developed for all film dimen-sion standards. Each title provides an indication of the filmwidth, a code designation for the perforation shape (BH, KS,DH, or CS), or the number of rows of perforations (1R, 2R,etc.), depending upon which is the significant factor, or theperforation

9、pitch without the decimal point.The numerals (1-3-0) have been added to the title of thisstandard to specify how the rows of perforations are placedon the film. This designation is necessary only when the filmstock is wider than its end use and more than one combina-tion of perforation rows is possi

10、ble. For 16-mm type perfo-rations on 35-mm width film, a maximum of four usable rowsof perforations is possible. The perforation rows shall benumbered starting at the reference edge. The referenceedge is the edge nearest to that row of perforations whichis retained in one of the 16-mm strips that ma

11、y be generatedby appropriate slitting of the parent 35-mm film. A row ofperforations which is discarded will always be given thenumber 0. Negative or intermediate films which are not slitmay contain a 0-numbered row of perforations if that perfo-rated row corresponds to the discard row of perforatio

12、ns onthe subsequent print stock. For all films with nonsymmetricalperforation rows, there could be two different windings forthe same numbered rows of perforations. Film perforated1-0 would be 1-0 regardless of winding, but depending onthe location of the reference edge, the winding would be Aor B,

13、according to ANSI/SMPTE 75M, which has beenexpanded to include all nonsymmetrically perforated film.2 The 0-numbered discard row is provided with roundperforations as a visible means of identification.3 Dimension A represents the film width and dimension Ethe edge-to-perforation distance after slitt

14、ing a nominal16-mm strip from the exposed and processed parent 35-mmwidth film. In deriving the dimension of 0.627 in (15.93 mm),the specified film shrinkage characteristics described inannex A.2 have been taken into account. Notwithstandingaccumulation of tolerances, A and E shall be as specified.4

15、 The dotted lines in figure 1 indicate the edge of the 16-mmcuts after slitting.5 The metric conversion of dimension A is purposely cho-sen and shown to three decimal places to prevent themaximum width dimension from exceeding 35 mm.Annex A (informative)Additional dataA.1 The user is reminded that,

16、as a plastic, film can changedimensions temporarily due to moisture or temperature, orpermanently due to solvent loss or strain effect.A.2 Film for positive use has a longitudinal pitch 0.2%longer than its companion negative. Shrinkage of the nega-tive during processing and aging prior to printing w

17、ill gener-ally not exceed 0.2%. Thus, the negative stock is expectedto be 0.3% 0.1% shorter than the positive. This differencewill minimize slippage between the two on the 12-in(305-mm) circumference sprocket of the printer, assuming afilm thickness of 0.0055 in to 0.0065 in (0.140 mm to 0.165 mm).A

18、.3 The uniformity of pitch, hole size, and margin (dimen-sions B, C, D, and E) is an important variable affectingsteadiness. Variations in these dimensions, from roll to roll,are of little significance compared to variations from oneperforation to the next within any small group of consecutiveperfor

19、ations. As an example, the uniformity of the margin isuniquely critical for optical printing. During the printing proc-ess, the placement of the image on the film is usually withrespect to successive lateral pairs of perforations at one-frame intervals. During subsequent projection, however, theport

20、ion of the image projected is usually located, not bythese perforations, but by the edge of the film. The lateralsteadiness of the projected image is, therefore, directlyrelated to the frame-to-frame uniformity of the margin.A.4 For historical background on the development of thisstandard, refer to

21、A. J. Miller and A. C. Robertson, “Motion-picture film its size and dimensional characteristics,”Jour. SMPTE, 74: 3-11, Jan. 1965.Annex B (informative)BibliographyANSI/SMPTE 75M-1994, Motion-Picture Film Raw Stock Designation of A and B WindingsSMPTE 223M-2001, Motion-Picture Film Safety FilmSMPTE 171-2001Page 2 of 2 pages