Patent ID: 6905068
Filing Date: 2005-06-14
Classification: G02B,G06K

Abstract:
1. In a reader for electro-optically reading indicia, an arrangement for focusing at least one of a light beam directed along an outgoing path toward the indicia for reflection therefrom, and return light reflected along a return path from the indicia over a field of view, the arrangement comprising: a) a first prism through which said at least one of the light beam and the return light is transmitted and optically modified over a first optical distance, the first prism having a first cross-section that varies transversely of at least one of the paths; b) a second prism through which said at least one of the light beam and the return light is transmitted and optically modified over a second optical distance, the second prism having a second cross-section that varies transversely of said at least one path; and c) a drive for moving at least one of the prisms relative to the other of the prisms in drive directions transversely of said at least one path, and changing at least one of the optical distances to focus said at least one of the light beam and the return light at focii spaced apart at different locations lengthwise along said at least one path.