SMPTE ST 198-2003 Motion-Picture Film (8-mm Type S) - 50-ft Model 1 Sound Camera Cartridge - Aperture Pressure Pad and Film Position.pdf

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1、 1 Scope This standard specifies the dimensions and location of the cartridge aperture and pressure pad as well as the position of the film in the aperture of 8-mm type S 50-ft model 1 sound motion-picture film camera cartridges. 2 Dimensions 2.1 The dimensions shall be as given in the figures and t

2、ables. 2.2 The dimensions apply to an assembled cartridge with a film load at the time of manufacture. 2.3 The datum planes and datum features used for dimensioning are as defined in SMPTE 197. 2.4 Dimensions T and U denote the lateral location of the film in the cartridge before insertion in the ca

3、mera. After insertion, dimension T becomes 0.060 in (1.52 mm) minimum and dimension U becomes 0.050 in (1.27 mm) minimum. 2.5 All dimensions in table 1, except dimensions A and C, apply at the front surface of the pressure pad. A draft of 5 degrees to the recess area is permitted as well as an insid

4、e or outside radius of 0.005 in (0.13 mm) at all corners to provide satisfactory mold release. 2.6 Dimension A denotes the space available from datum plane C for penetration of the camera film alignment guide wings or the camera claw into the recessed area of the cartridge pressure pad. 2.7 Dimensio

5、n B is measured from datum plane C and determines the operating position of the cartridge pressure pad. NOTE Three lugs, Nos. 1, 2, and 3, on the pressure pad are intended to touch the camera aperture plate and thereby determine the film plane alignment and the clearance allowed for the thickness of

6、 the film. The required clearance is defined in SMPTE 199. Lug No. 4 should not touch the camera aperture plate (see annex A.5). Page 1 of 4 pages SMPTE 198-2003 Revision of ANSI/SMPTE 198-1998 Copyright 2003 by THE SOCIETY OF MOTION PICTURE AND TELEVISION ENGINEERS 595 W. Hartsdale Ave., White Plai

7、ns, NY 10607 (914) 761-1100 ApprovedNovember 12, 2003SMPTE STANDARD for Motion-Picture Film (8-mm Type S) 50-Ft Model 1 Sound Camera Cartridge Aperture, Pressure Pad and Film Position SMPTE 198-2003 Page 2 of 4 pages Figure 1 Cartridge pressure pad Table 1 Pressure pad dimensions Dimensions Inches M

8、illimeters A 0.140 0.010 3.56 0.25 B 0.077 0.005 1.96 0.13 C 0.090 min 2.29 min D 0.540 min 13.72 min E 0.260 max 6.60 max F 0.360 0.020 9.14 0.51 G 0.455 min 11.56 min H 0.365 max 9.27 max J 0.300 max 7.62 max K 0.000 min 0.00 min L 0.540 0.015 13.72 0.38 M 0.300 min 7.62 min N 0.140 max 3.56 max O

9、 0.058 0.022 1.47 0.56 P 0.038 0.022 0.97 0.56 Q 0.055 min 1.40 min S 0.090 min 2.29 min SMPTE 198-2003 Page 3 of 4 pages Figure 2 Cartridge aperture opening and film position Table 2 Aperture opening and film position dimensions Dimensions Inches Millimeters T 0.050 min 1.27 min U 0.040 min 1.02 mi

10、n V 0.061 0.006 1.55 0.15 W 0.648 0.006 16.45 0.15 X 0.451 0.006 11.46 0.15 Y 0.451 0.004 11.46 0.10 Z 0.111 0.003 2.82 0.08 A10.642 min 16.31 min B10.445 min 11.30 min SMPTE 198-2003 Page 4 of 4 pages Annex A (informative) Additional data A.1 A force of 8 oz to 14 oz (2.2 N to 3.9 N) must be exerte

11、d on the pressure pad for proper seating against the camera aperture plate. A.2 The two cut-out areas in the pressure pad permit the use of fingers for side-guiding. A force of 1.5 oz to 2.5 oz (0.42 N to 0.70 N) per finger is adequate to ensure picture steadiness. A.3 Although sufficient recess fro

12、m the front surface of the pressure pad to allow for camera claw and camera aperture guide finger penetration, as defined by dimension C and 2.6 must be provided, additional portions of the pad surface may be recessed also. A.4 The cartridge pressure pad recess, defined by dimensions D, E, and J, is

13、 available for camera claw film transport engagement. The perforation used for the film vertical registration at its stopping position is specified in SMPTE 157 as minus-2 from the perforation adjacent to the image formed by the camera aperture. The horizontal centerline of the camera aperture shoul

14、d coincide nominally with datum plane A. A.5 Lug No. 4 is included on the pressure pad although it serves no function after the cartridge is properly inserted in the camera. It does, however, aid in seating the pressure pad and prevent the film from being pinched at the bottom of the cartridge apert

15、ure opening. A.6 To provide a consistent method of measurement, it is recommended that a cartridge gauging fixture be used which incorporates datum surfaces, a locating pin, and means of exerting locating forces on appropriate surfaces of the cartridge. Drawings for a suitable cartridge-holding fixt

16、ure may be obtained from the Society of Motion Picture and Television Engineers, 595 West Hartsdale Avenue, White Plains, NY 10607. Annex B (informative) Bibliography SMPTE 157-1999, Motion-Picture Film (8-mm Type S) Camera Aperture Image and Usage SMPTE 166-1999, Motion-Picture Film (8-mm Type S) E

17、xposure Control and Stock Identification Sound and Silent Camera Cartridge Notches SMPTE 197-2003, Motion-Picture Film (8-mm Type S) 50-Ft Model 1 Sound Camera Cartridge Cartridge, Cartridge-Camera Interface and Take-Up Core SMPTE 199-2003, Motion-Picture Film (8-mm Type S) 50-Ft Model 1 Sound Camera Cartridge Pressure Pad Flatness and Camera Aperture Profile SMPTE 200M-2003, Motion-Picture Equipment (8-mm Type S) Model 1 Camera Cartridge Camera Run Length, Perforation Cutout and End-of-Run Notch