SMPTE EG 31-1995 Considerations for Cassette Bar Code Readers.pdf

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1、EG 31-1995 SMPTE ENGINEERING GUIDELINE Considerations for Cassette Bar Code Readers 1 Scope This guideline illustrates examples of possible manufacturing implementations of the cassette la- bel recess area which may impact the reading of bar code labels. It applies to all SMPTE standardized cassette

2、s which employ a label area utilized for bar code identifica- tion. Page 1 of 2 pages 2 Manufacturing implementations Cassette manufacturers may employ a variety of methods in the plastic: molding process and in the placement of the cassette shell seam. This results in differences in the label area.

3、 Figure 1 illustrates examples of several possible implementations of the cassette label recess area. 3 Bar code readers Given the various implementations possible, equip- ment manufacturers should consider these factors in the design of optical bar code readers. Copyright O 1995 by the SOCIETY OF M

4、OTION PICTURE AND TELEVISION ENGINEERS 595 W. Hartsdale Ave., White Plains, NY 10607 (914) 761-1100 Approved March 1,1995 EG 31 -1995 LABEL AREA VERSION 2: (LABEL AREA PERPENDICULAR TO EASE) LABEL AREA VERSION 3: (LABEL AREA AT ANGE TO EASE) I It I LABEL AREA VERSION 4: (LABEL AREA AT ANGE TO BACE)

5、Rear edge view Label Shell seam area Shell bottom Shell top Shell seam Shell bottom Shell top Shell seam Label area i Shell bottom Shell top Shell seam Shell bottom Side view NOTE - Diagrams are not to scale; cassette profile differences have been exaggerated to indicate clearly the differences. Figure i - Examples of possible implementations of the cassette label recess area Page 2 of 2 pages