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SMPTE ST 75M-1994 Motion-Picture Film - Raw Stock - Designation of A and B Windings.pdf

1、SMPTE STANDARD ANSI/SMPTE 75M-1994 Revision of ANSIISMPTE 75M-1988 for Motion-Picture Film - Raw Stock - Designation of Aand B Windings 1 Scope Page 1 of 2 pages 2 Reference edge of film This standard specifies a method for designating the type of winding for rolls of single-row perforated and multi

2、ple-row, nonsymmetrically perforated motion- picture raw stock film in terms of the reference edge. WINDING A 11 2.1 For single-row perforated raw stock, the reference edge shall be that edge closest to the perforations (see figure 1). WOUND EMULSION IN u DISCARD ROW OF PERFORATIONS 1 Figure 1 - Des

3、ignation of winding CAUTION NOTICE: This Standard may be revised or withdrawn at any time The procedures of the Standard Developer require that action be taken to reaffirm, revise, or withdraw this standard no later than five years from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 may recelve cu

4、rrent information on all standards by calling or writing the Standard Developer. Printed in USA. Copyright O 1994 by THE SOCIETY OF L American National Slandard MOTION PICTURE ANO TELEVISION ENGINEERS 595 W Harisdale Ave, Whfie Plains. NY 10607 (91 4) 761 -1 1 O0 Approved January 31, 1994 SMPTE 75M

5、94 m 8357403 0003507 329 m ANSI/SMPTE 75M-1994 2.2 For mu It i ple-row, nonsym met r ically perfora- ted raw stock, the reference edge shall be that edge closest to a row of perforations which may be retained if the film is subsequently slit into narrower widths. 3 Winding designation The winding of

6、 the film shall be designated A or B. When a roll of motion-picture raw stock wound emul- sion-in is held so that the roll of film is above and away from the observer and the film end unwinds from the side of the roll which is toward the observer and down, winding A shall have the reference edge of

7、the film Annex A (informative) Flange orientation along the left side;winding B shall have the reference edge of the film along the right side. No preference for either type of winding is implied, since both types are required for use on existing equipment. The film may be wound on cores for darkroo

8、m loading or on spools for daylight loading. NOTE - Many 35-mm multiple-row, nonsymmetrically perforated films contain a discard row of perforations usually having some form of visible identification. It has been the practice to identiy the winding orientation by this visible identification, such as

9、 L or R. Temporarily, some manufacturers may wish to supplement the new A and B film identification with L (which is now 6) or R (which is now A). Some 16-mm films are supplied on spools with a square hole in one flange and a round hole in the other. Since the flange orientation is important to a customer when requesting A or B winding for his product, it may be desirable for a manu- facturer to identify the flange orientation when spools with dissimilar holes are used. Page 2 of 2 pages

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