Design of the Scanner Opening

Second, the scanner must be positioned so that the scan volume and illumination light will cover the entire bar code. The scan volume is shown in Figure 2-2. The combina tion of the Scan Volume and the illumination light is called the Field of View. Design ing around the scanner Field of View is explained more in the following section, Design of the Scanner Opening.

Figure 2-2. Scanning Volume

147mm [5.79"]

13mm

[0.5"]

94mm [3.70"]

Scan Volume @ 165mm [6.5"]

A typical system uses the scanner mounted inside a host enclosure with an opening for the scanner Field of View to exit the scanner window and read bar codes. If the scanner is flush against the opening, it should be the size of the scanner window at a minimum, but only exposing as much of the front surface of the scanner as necessary. Additional clearance in the opening can also be considered for the speaker opening.

The design and placement of the scanner opening within a host enclosure is critical for optimum system performance. Use the detailed dimensions shown in Appendix B, Mechanical Specifications, to design the host enclosure and scanner opening along with the following guidelines.

•The opening must not block any of the outgoing illumination light, described by dimensions of the scanner Field of View.

•Ensure that there are no reflective surfaces around the area of the scanner opening.

•The minimum opening size must increase as the distance between the scanner and the window increases. This is necessary to accommodate the width and height of the scan volume.

•The opening or other parts of the host enclosure must not enter the Field of View in order to allow the bar code image to be captured by the scanner.

If all the red illumination LED's remain on when the scanner is installed in the host enclosure, then something is blocking the Field of View.

NOTE

Integration Manual

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