| 摘要 |
A miniature scan engine module for bar code reading and data collection systems utilizes a light source 44 and a light collector 42, which in one embodiment, are flexurally supported on a platform 62 which reciprocates 88 on pivots defined by flexures 46, 48 or 96. The optical collector faces the bar code and pivots with the scanning beam source (a laser diode). A diffraction grating or Fresnel lens on the surface of the optical collector which faces the code directs the incoming light so that it propagates internally in a substrate within the body of the collector, i.e. in the optic itself and without air paths which require additional volume in the module, to a photodetector. The scan engine can be configured so that it occupies a volume of less than 1 cubic inch. A data collection system, in the form of a portable terminal 10, has a housing which provides the handle 12 of a scanning accessory. The housing of the accessory has a receptacle for a terminal unit 14 which is separable from the accessory's housing. |
