Illumination system with prism for use in imaging scanner

摘要

An apparatus includes an illumination lens, an illumination light source for generating illumination light, and a prism made of optical transparent material. The first section on the first surface of the prism has a length that is at least four times as long as its width. The first surface of the prism includes a second section adjacent to the first section for defining the edge of an aperture. The third surface of the prism is configured to reflect the illumination light received from the first section onto the second surface of the prism. At least a portion of the illumination light received from the first section passes through both the second surface of the prism and the illumination lens for projecting illumination light onto a target object within an imaging field of view.

主权项

1. An apparatus comprising:
an illumination lens; an illumination light source for generating illumination light; an imaging lens arrangement; an imaging sensor having photosensitive elements configured to detect light from a target object within an imaging field of view through the imaging lens arrangement during a time period when the illumination light is generated by the illumination source, wherein the imaging sensor is configured to output image data from the photosensitive elements; a prism made of optical transparent material for the illumination light, the prism comprising a first surface having a first section thereon facing the illumination light source to allow the illumination light received from the illumination light source to pass through, a second surface facing the illumination lens, and a third surface facing both the first surface and the second surface; wherein the first section on the first surface has a length thereof at least four times as long as a width thereof, and wherein the first surface includes a second section adjacent to the first section for defining the edge of an aperture; and wherein the third surface of the prism is configured to reflect the illumination light received from the first section onto the second surface to redirect at least a portion of the illumination light received from the first section to pass through both the second surface of the prism and the illumination lens for projecting the portion of the illumination light onto the target object within the imaging field of view, and the third surface of the prism is also configured to substantially prevent the additional light received from the second section from being projected onto the target object within the imaging field of view though the illumination lens.