1、 STD-SMPTE 22M-ENGL 3797 D 8357Lt01 0002933 143 E SMPTE STANDARD for Video Recording - 3/4-in Type E Helical Scan - Cassette ANSIISMPTE 22M-I 997 Revision of ANSIISMPTE 22M-1986 I Scope This standard specifies the dimensions of a video cassette for use with a 3/4-in type E helical-scan video tape re
2、cording cassette system, operating at a tape speed of 95.3 mm/s (3.752 ink). 2 Datum planes 2.1 Datum plane A is the plane determined by points A, B, and C in figure 5. 2.2 Datum plane B is the plane that includes the center of datum holes (a) and (b) and is orthogo- nal to both datum planes A and C
3、. Page 1 of 6 pages 2.3 Datum plane C includes datum hole (a) and is orthogonal to both datum planes A and B. 3 Dimensions 3.1 The dimensions necessary for the interface of equipment shall be as specified in the figures and table. 3.2 The metric dimensions are primary 4 Measurement environment The t
4、emperature shall be 23C k 1C (73F k 2F) with a relative humidity of (50 f 2)%. Table 1 - Dimensional tolerances not otherwise specified Millimeters Inches Over To Tolerances Over To Tolerances 0.0 4.0 5 0.2 0.000 O. 157 1- 0.008 4.0 16.0 5 0.3 0.157 0.630 t: 0.012 16.0 63.0 I 0.4 0.630 2.480 * 0.016
5、 63.0 250.0 10.5 2.480 9.843 k 0.020 I CAUTION NOTICE This Standard may be revised or withdrawn at any time The procedures of lhe Standard Developer require that action be taken to reaffirm revise or withdraw this standard no later than five years from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
6、 may receive current information on all standards by calling or writing the Standard Developer Printed in USA Copyright O 1997 by THE SOCIETY OF L American National Standard MOTION PICTURE AND TELEVISION ENGINEERS 595 W Hartsdale Ave, While Plains, NY 10607 (914) 761-1100 Approved October 2,1997 ANS
7、IISMPTE 22M-1997 Datum Plane C (SeeFigure2) L LPlane 7 (See Plane A E F P / 1 / / / / / / / AVAILABLE FOR LABEL AND/OR WINDOW 64 , 18.8 , 87.2 II I Note3 Y 120.8 165.5 -1 221%.6 , Plane A Note 5 NOTES 1 Hatched area shows the label area andlor window area. The surface of the glued label should be in
8、dented from plane A. 2 Guide groove. 3 Holding groove. 4 The outer edge should be slanted, but not more than 4“ from vertical. 5 This dimension is measured from datum plane A. Figure 1 -Top view of video cassette Page 2 of 6 pages ANSIISMPTE 22M-1997 Section B-B 1 - ml pl ci O z - 77.5 Section A-A D
9、atum -=Llrr Plane BN N g DIAIO.15 Section CC 1 4.5 to 5 8 b-4 i 221a.6 Datum Plane c / 4.5 +0.1 R hk O Unit: rnm A still-function hole t 4 I Note 1 Note 4 I I Note 2 safety cap Section D-D NOTES 1 Recording is possible when the safety hole is covered. 2 The cap must not protrude but should be indent
10、ed from datum plane A. 3 Datum hole (a) is primary. 4 These dimensions are measured from datum plane A. Figure 2 - Bottom view of video cassette Page 3 of 6 pages ANSIISMPTE 22Y-1997 Take-up d Supply red STD-SMPTE 22M-ENGL 1977 W 8357401 000291b 952 9 3.55 DIA hola Datum Plane B I Unit: mm lid lock
11、level Vk in dimmion Of rm x :nive ride -Datum Plane C - r- - - -i 1wE projection of lid Datum Plane A Note 2 Semiin CC . Note 5 unlocking Ikmwr NOTES 1 a) The protecting lid of the cassette shall open (height H) more than 35 mm (1.38 in). HegM H is measured from datum plane A. b) Recorder/player uni
12、t shall be designed to open the protecting lid (height H) between 30 mm and 35 mm (1 .I8 in and 2 The protecting lid opens as shown in section A-A when the cassette is inserted into the recorder/player. Maximum force 3 Section B-B shows the relationship between the cassette and the unlocking lever o
13、f the recorder/player. 4 The arrow shows the direction of cassette insertion. 5 Hole for drive pin. 6 The supply reel is of two types as follows: Hub diameter (D) of supply reel type I is 38 mm (1 50 in); hub diameter (D) of supply reel type II is 80 mm (3.15 in). A minimum distance of 1.5 mm (0.059
14、 in) is required between the outer edge of a full reel pack and the edge of the reel fiange. 1.38 in) during operation. to open the lid shall be 0.981 N (100 gf). 7 Distance when the lock level is parallel to datum plane C. Figure 3 - Location of reels and protecting lid Page 4 of 6 pages STD-SMPTE
15、22M-ENGL 3977 8357403 0002737 99 m ANSIISMPTE 22M-1997 Unit: mm Note 1 A wppy reel spindle takeup reel spindle 34 DIA pin, at trisected points on R10 circle Note 3 NOTES 1 Center of tape on supply reel when cassette is inserted in recorder/player. 2 Center of tape on take-up reel when cassette is in
16、serted in recorder/player. 3 Pins of the reel spindle drive the reel and can be pressed down to the level of plane B. 4 Distance between centers of two reel spindles. 5 Distance between contact plane to supply reel and datum plane A of the cassette. 6 Distance between contact plane to take-up reel a
17、nd datum plane A of the cassette. Figure 4 - Relationship between reels and reel spindles Page 5 of 6 pages ANSUSMPTE 22M-I997 130 supporting areas (4-1 ODIA cross hatched area) 2 -1 10 - 7 Datum Plane C ne B - NOTES 1 Datum plane A is determined by datum points A, B, and C. 2 Flatness of the four c
18、rosshatched areas shall be coplanar within 0.2 mm (0.008 in). 3 Flatness of the hatched area shall be coplanar within + 0.5 mm - 0.6 mm (+ 0.020 in - 0.024 in) of datum plane A. The positive deviation is measured upward from the bottom plane. Figure 5 -Cassette datum plane Annex A (informative) Bibliography ANSIISMPTE 21M-1997, Video Recording - 34-in Type E Helical Scan - Records Page 6 of 6 pages
