The combination of a rooftop optical element and a soft edge aperture stop, as well as the introduction of a negative spherical aberration in a positive focusing lens, improve working distance and depth of focus in both moving beam and imaging readers for electro-optically reading indicia such as bar code symbols, especially for close-in symbols, and moreover tend to reduce undesirable light intensity modulation in the beam profile thereby improving reader performance.

 
Web www.patentalert.com

< Computer system control with user data via interface surface

< Apparatus for monitoring optical frequencies of WDM signals

> Inspecting swath boundaries produced by thermal transfer of organic materials in forming OLED devices

> Optically integrated device

~ 00272