ANSI IT7.211-1998 Audiovisual Systems - Slide Trays for Projectors - Circular Slide Tray《视听系统.幻灯片放映机用幻灯片托盘.圆形幻灯片托盘》.pdf

1、T7.211-ENGL 1978 = 0724350 O 5518rl1 L5b 1 ANSUPIMA IT7.211-1998 for Audiovisual Systems - Slide Trays for Projectors - Circular Slide Tray This material is reproduced from TT-7 -3. , copyrightW3 , with permission of the American National Standards Institute, Inc. Not for resale. No part of this pub

2、lication may be copied or reproduced in any form, electronic retrieval system or otherwise, without the prior written permission of the American National Standards Institute, Inc., i 1 West 42nd Street, New York, New York 10036. erican National Standard -= rra American National Standards InstitUte 1

3、1 West 42nd Street New York, New York 10036 STD-ANSI IT7-211-ENGL 1998 m 0724150 055LB42 O92 I ANSVPIMA IT7.211-1998 Revision and redesignation of ANSI IT7.211-1990 American National Standard for Audiovisual Systems - Slide Trays for Projectors - Circular Slide Tray Secretariat Photographic their ex

4、istence does not in any respect preclude anyone, whether he has approved the standards or not, from manufacturing, marketing, purchasing, or using products, processes, or procedures not conforming to the standards. The American National Standards Institute does not develop standards and will in no c

5、ircumstances give an interpretation of any American National Standard. Moreover, no person shall have the right or authority to issue an interpretation of an American National Standard in the name of the American National Standards Institute. Requests for interpretations should be addressed to the s

6、ecretariat or sponsor whose name appears on the title page of this standard. CAUTION NOTICE: This American National Standard may be revised or withdrawn at any time. The procedures of the American National Standards Institute require that action be taken periodically to reaffirm, revise, or withdraw

7、 this standard. Purchasers of American National Standards may receive current information on all standards by calling or writing the American National Standards Institute. Published by American National Standards Institute, Inc. 11 West 42nd Street, New York, NY 10036 Copyright O 1999 by American Na

8、tional Standards Institute All rights reserved. No part of this publication may be reproduced in any form, in an electronic retrieval system or otherwise, without prior written permission of the publisher. Printed in the United States of America STD-ANSI IT7.233-ENGL 1998 E 0724350 0553844 lb5 H Con

9、tents Page Foreword i 1 Scope . 1 2 Normative references . 1 3 Definitions . 1 4 Capacity 2 5 Dimensions . 2 6 Material . 2 7 Parallel plate test 2 8 Torque specification . 2 Table 1 Fig u res 1 2 3 Annex A Bibliography 7 Dimensions for circular slide trays 3 Bottom view of a slide tray 4 Bottom, to

10、p, and side views of tray with slide retainer plate removed 5 Zero-position indicator notch 6 I - STD-ANSI IT?=ZLL-ENGL 3998 O724350 0553845 8TL m Foreword (This foreword is not part of American National Standard This standard is a revision and redesignation of ANSI lT7.211-1990. Changes in- clude t

11、he addition of normative references and a bibliography, and use of SI units as the primary method of measurement. This standard contains one informative annex, which is not considered part of this standard. Suggestions for improvement of this standard are welcome. They should be sent to the Photogra

12、phic e-mail: . This standard was processed and approved for submittal to ANSI by PIMA Technical Committee on Instructional Audiovisual Systems Standards, IT7. Committee approv- al of the standard does not necessarily imply that all committee members voted for its approval. At the time it approved th

13、is standard, the IT7 Committee had the following members: ANSVPIMA IT7.211-1998.) John G. Wilshusen, Chairman John Gignac, Secretary Organization Represented Name of Representative Photographic 1994, Plastics - Polystyrene IPS) moulding and extrusion materials - Part I: Designation system and basis

14、for specifications“ IS0 2768- 1 : 1 989, General tolerances - Part I: Tolerances for hear and angular dimensions without individual tolerance indications 3 Definitions For the purpose of this standard, the following definitions apply. 3.1 thick slide: A mounted transparency whose thickness is approx

15、imately 3.2 mm (0.1 25 in). This type of slide is typified by, but not restricted to, construction that involved the binding of the transparency and mask with a protective cover(s) of transparent material in a mount, or the binding of the material in a rigid mount. Available from the American Nation

16、al Standards Institute, 11 West 42“ Street, New York, NY 10036. 1 STD-ANSI IT7-233-ENGL 3998 0724350 0553847 674 ANSVPIMA IT7.211-1998 3.2 thin slide: A mounted transparency whose thickness is approximately 1.6 mm (0.062 in). This type of slide is typified, but not restricted to, construction involv

17、ing the binding of the transparency in a paper- board mount. 4 Capacity The capacity of the circular slide tray, horizontal gravity-feed type, shall be 80 slides in cardboard, plastic, or thin glass mounts. When projecting intermixed mounted slides, the automatic focus may need to be adjusted for th

18、e different slide mounts. NOTE - Slides may not feed properly if they are mounted with loose or sticky tape, or have sharp glass cor- ners. 5 Dimensions 5.1 General Most tray dimensions are given with respect to datum planes (tray surfaces) that engage in mating pro- jector surfaces in such a way th

19、at insures proper alignment of the slide tray to the projector. Figure l provides the bottom view of the circular slide tray. 5.2 Spec If cations Figures 2 and 3 in conjunction with table 1 provide the dimensional specifications. NOTE - Dimensions contained herein apply when the tray is at an equili

20、brium state of 21% (70 OF) and 50% relative humidity. All tolerances reflect manufacturing capabilities, not the functional limits of the slide tray. 5.3 Tolerances Dimensions in table 1 without tolerance indications are in accordance with IS0 2768-1 (tolerance class: medium). 6 Material Plastic mol

21、ding material, such as “polystyrene” molding batch IS0 1622-PS 41, or other molding material with the same heatproof quality, shall be selected by the manufacturer. 7 Parallel plate test Table 1 includes dimensions for the maximum separation of two parallel plates through which slides to be used in

22、these trays must pass freely under the force of gravity. The parallel plates shall have length and width dimensions in excess of the maximum overall size dimensions for slides. 8 Torque specification When an empty slide tray is placed in an operating position on a slide projector that has the index

23、and locator levers retracted, it shall rotate freely with a torque of between 468 centimeter-grams minimum and 3456 centimeter-grams maximum. 2 STDmANSI IT7*233-ENGL 3798 I 0724150 0553848 500 E ! t a T. o . - n - i c C U C c U C L - C I n - f mu C? vr U . I ul mo ANSVPIMA IT7.211-1998 - _I_-. o u1

24、i- (3 z. 3 STDmANSI IT7=21L-ENGL 1998 W 0724350 055L849 447 ANSVPIMA IT7.211-1998 Figure 1 - Bottom view of a slide tray 4 STD-ANSI IT7.2LL-ENGL L498 W 0724350 0553850 Lb9 O ANSI/PiMA 177.211-1998 3; f va 4 .- d 5 ANSVPIMA IT7.211-1998 ! 1 m 6 STDmANSI IT7.2LL-ENGL 1998 0724350 0553852 T3L ANSVPIMA

25、IT7.211-1998 Annex A (informative) Bibliography IS0 1622-2: 1995, Plastics - Po/vstyrene (PS) moulding and extrusion materias - Part 2: Preparation of test specimens and determination of properties“ IS0 11 106-1 :1997, Photography - Slide trays for projectors - Part 1: Straight slide tray, open type (European desan) ) IS0 11 106-2:1997, Photography - Slide trays for projectors - Part 2: Straight slide tray, closed type (Japanese design) ) 7