1、STD-SMPTE 35M-ENGL 1997 D 8357403 0002939 bbl D SMPTE STANDARD for Television Analog Recording - 112-in Type G - Cassette and Tape ANSIISMPTE 35M-I 997 Revision of ANSIISMPTE 35M-1991 Page 1 of 8 pages 1 Scope This standard specifies the dimensions of a video cassette and a video magnetic tape inten
2、ded for use with 1/2-in type G video systems operating at tape speeds of40,20, and/or 13.3 mrns (1.57,0.79, andlor 0.52 ink). 2 Videotape 2.1 The width of the video tape shall be 12.65 mm f 0.02 mm (0.498 in f 0.001 in). 2.2 The maximum allowable thickness of the magnetic tape, including the coating
3、, shall be 25 pm. The distance between the edge of the reel flange and the outer edge of a full reel pack shall be more than 0.5 mm (0.02 in). 3 Leader and trailer tape 3.1 The leader and trailer tape of the width and thickness specified in 3.2 and 3.3 shall contain a metal foil that provides conduc
4、tivity per centi- meter of more than 200 S to ensure that auto- matic stopping devices function properly at both ends of the magnetic tape. 3.2 The width of the leader and trailer tape shall be 12.65 mm i- 0.03 mm (0.498 in f 0.001 in). 3.3 The maximum allowable thickness of the leader and trailer t
5、ape shall be 45 pm. 3.4 The length of the leader and trailer tape shall be 250 mrn k 60 mm (9.84 in k 2.36 in) and O0 7N +I O b (D (3 -r -magnetic tape - splicing tape / / trai ler tape leader tape / 1 1 N Supply reel Take-up reel 1: 156 Figure 1 - Leader and trailer 70 rnm +IO mm -20 mm (2.76 in +
6、0.39 in -0.79 in), respectively (see figure 1). 3.5 The spliced section shall withstand a tension of 15 N. CAUTION NOTICE This Standard may be revised or withdrawn at any time The procedures of the Standard Developer require that action be taken to reaffirm revise or withdraw this standard no later
7、than five years from the da!e of publication Purchasers of standards may receive current Information on all standards by calling or writing !he Standard Developer Printed in US A American National Standard Copyright O 1997 by THE SOCIETY OF MOTION PICTURE AND TELEVISION ENGINEERS 595 W Hartsdale Ave
8、 White Plains NY 10607 (914) 761-1100 October Approved 2.1997 STDmSMPTE 35H-ENGL 1977 8357901 0002920 383 ANSIISMPTE 351111-1997 4 Datum planes 4.1 Datum plane Z shall be defined by three datum spots, A, B, and C, as shown in figure 4. 4.2 Datum plane X shall be orthogonal to datum plane Z and shall
9、 include the centers of datum hole (a) and datum hole (b), 3. 4.3 Datum plane Y shall be datum plane X and datum include the center of datum in figure 3. as shown in figure orthogonal to both plane 2 and shall hole (a), as shown 5 Dimensions 5.1 The dimensions necessary for the interface of equipmen
10、t shall be as specified in the figures. 5.2 Metric dimensions are primary. 6 Measurement environment The temperature shall be 20C i 2C (68F i 4F) with a relative humidity of (50 i 2)%. 4-RIf0.1 , Unit : mm Oh * 1 I UJU NOTES 1 The dimensions are verified by using limit gauges. 2 No part of the lid s
11、hall protrude beyond the bottom plane of the cassette during opening and closing of the lid. 3 This dimension shall be measured from datum plane Z. 4 Label and/or window area is available for label and/or window. 5 The cassette may be held in position by the recorder and/or player unit on this holdi
12、ng area. Figure 2 -Top and side view of video cassette Page 2 of 8 pages STD-SMPTE 35M-ENGL 1997 D 8357403 OCIO2923 21T Detail of Safety Tab ANSIISMPTE 35M-I 997 do u + 1 b t 7.6OJf - Datum Plane Y , Section C-C Section 6-6 Section A-A Datum hole lbl IO8fo.2 1 I 40 O. 3 NOTE - Datum hole (a) is prim
13、ary. Figure 3 - Bottom view of video cassette Page 3 of 8 pages ANSIISMPTE 35M-I997 t- I IO* 0.3 1 130 0.3 -?Y _I NOTES 1 The crosshatched areas 10 mm (0.39 in) in diameter are datum spots. 2 The four hatched areas, which are supporting areas, shall be coplanar within 0.05 mm (0.002 in) of each datu
14、m spot. 3 Datum plane Z shall be determined by datum spots A, B, and C. 4 Datum spot D shall be coplanar within 0.30 mm (0.012 in) of datum plane Z. 5 The areas within I mm (0.04 in) from the edge of the cassette shall be removed from the supporting areas. Figure 4 - Datum spots and supporting areas
15、 t- 156 O: Danun Pien Y NOTES 1 Rotating direction during forward operation. 2 The opening range of the lid in the recorder/player is 27.5 mm + I .5 mm - O mm (1 .O8 in + 0.06 in - O in). 3 The reels shall be locked to avoid loosening of the tape during storage or transportation. Figure 5 - Location
16、 of reels in recorderlpiayer Page 4 of 8 pages STD-SMPTE 35M-ENGL A797 m 83574U3 0002923 O92 m ANSIISMPTE 35M-1997 Datum Plane X / Section C-C I . -1 Fc Datum Plane X NOTES 1 The hatched area is for the loading mechanism of the unit before opening the lid. 2 The hatched and crosshatched areas are fo
17、r the loading mechanism of the unit after opening the lid. Figure 6 - Casette protecting lid Page 5 of 8 pages STD*SMPTE 35M-ENGL 1997 835740L O002924 T27 D ANSIISMPTE 35M-1997 Recording Time* Hub diameter of reels I60 minutes Q 52 10.5 60 minutes Q 30 k0.5 *Recording time is specified for a tape sp
18、eed of 20 mmls. Figure 7 - Cassette reei 9“ i .! -ti +I! BI NOTE - Center of tape on reels when cassette is inserted in recorderiplayer. Figure 8 - Relationship between reels and reel spindles Page 6 of 8 pages STD-SMPTE 35M-ENGL 1777 A357901 0002725 7b5 ANSIISMPTE 35M-1997 - _ - Unlocking lever Dir
19、ection A Min. 2.5 View D LC I 1 Min. 141.8 1 I I- I 1 75 From Datum Plane X l I I l eZ LI From Datum Plane X NOTES The operating ranges, which are the crosshatched areas, show the limits within which the lid must be unlocked when an unlocking lever of 2.5 mm (0.10 in) minimim width is inserted. The
20、allowable ranges, which are the hatched and crosshatched areas, show the limits within which an unlocking lever can be inserted. Allowable range in direction A. Allowable range in direction B. The tip of the unlocking lever shall be shaped into a semicircle or hemisphere, the radius of which is one-
21、half the unlocking lever width. Figure 9 -Allowable and operating ranges for unlocking cassette lid lever Page 7 of 8 pages ANSIISMPTE 3511111997 CASSETTE TEST CONDITIONS MAXIMUM FORCE TO OPEN LID SHALL BE 1.5 N measuring range: O - 29mm Datum Plane Figure 10 - Force to open lid DIRECTION A mcasuri
22、direction FORCE TO UNLOCK LID SHALL NOT BE GREATER THAN 1 .O N IN DIRECTION A L / measuring rod f DIRECTION B FORCE TO UNLOCK LID SHALL NOT BE GREATER THAN 1 5 N IN DIRECTION B Figure 11 - Force to unlock lid I 3a *0.2 SPRING FORCE FOR PUSHING DOWN REEL SHALL BE 1.5 N f 0.5 N _ +I oaturn Piane I measuring direction Figure 12 - Spring to hold reel Page 8 of 8 pages
