摘要:
An imaging system for, and a method of, electro-optically reading a symbol located within a range of working distances from the system, utilize a solid-state imager having an array of image sensors for capturing return light from the symbol over a field of view and for generating an electrical signal indicative of the captured return light, and a controller operative for decoding the electrical signal into data indicative of the symbol, and for determining that the symbol has been successfully decoded. The symbol has a plurality of optical characteristics, such as symbol element size and contrast, which vary with working distance. A memory stores a known set of values of the size and contrast characteristics of the symbol when the symbol lies in a restricted zone within the range of working distances. The controller is further operative, after the symbol has been successfully decoded, for processing the size and contrast characteristics of the decoded symbol, and for determining that the decoded symbol has been successfully read within the restricted zone when each size and contrast characteristic lies within the known set of values stored by the memory.
摘要:
An apparatus includes a first lens, a liquid lens, imaging sensor arrays, an aperture stop, and a barcode decoding system. The first lens has a fixed optical power. The liquid lens has a variable optical power. The imaging sensor arrays are operable to receive light passing through both the first lens and the liquid lens. The liquid lens is positioned between the aperture stop and the imaging sensor arrays. The barcode decoding system receives signals from the imaging sensor arrays.
摘要:
An imaging lens assembly focuses light from indicia in a working range of distances along an optical path onto a solid-state imager of an imaging reader. The lens assembly includes a negative spherical aberration component and an aperture stop that together are operative for extending the working range.
摘要:
An aiming light assembly supported by a mobile imaging reader projects an aiming light pattern on a symbol. A controller modulates the aiming light pattern to render the aiming light pattern more visibly discernible to an operator, especially in a brightly lit ambient environment, to enable the operator to position the aiming light pattern on the symbol prior to reading.
摘要:
An exemplary imaging based barcode reader has an imaging system that includes a photosensitive array, a focusing lens fixed with respect to the light detecting array which creates an image of a target object on the light detecting array; and an aperture stop fixed in relation to the focusing lens having an opening that allows light from the target object to impinge upon the lens for focusing onto the light detecting array. The focusing lens has a surface facing the aperture stop that is toroidal and in one exemplary embodiment approximates a cylinder that balances or optimizes. Astigmatism of the lens in the imaging plane located in the close proximity to the photosensitive array.
摘要:
The disclosed bar code reader includes an auto-focusing component for rapidly producing in focus images. An imaging system makes use of an aiming pattern that impinges upon the coded indicia of a target. The imaging system includes a light monitoring pixel array and a focusing lens that is fixed with respect to the pixel array for transmitting an image of the target object onto the pixel array. The imaging system also includes a movable mirror mounted for movement along a path of travel to reflect light passing through the focusing lens onto the pixel array. A drive motor moves the mirror relative the lens to adjust a focus of an image of the object formed at the pixel array. An automatic focusing component of the imaging system analyzes the aiming pattern reflected from the target object and projected onto the pixel array by the lens. The automatic focusing component issues commands to the drive motor causing the mirror to move along its path of travel to a suitable position for properly focusing the target object onto the pixel array.
摘要:
An illumination assembly for emitting light for imaging a target object comprises an illumination source that emits at least one light beam upon activation toward an illumination guide. The illumination guide has a first and a second side such that the light beam from the illumination source is scattered between the first and second sides. A textured surface is located substantially along the first side of the illumination guide. The scattered light exits the illumination guide from the textured surface to form a prescribed illumination pattern for imaging a target object.
摘要:
Described is a light pipe having a first end receiving light beams from a light source, a light pipe body through which the light beams travel and a second end including a dispersion structure with a light emitting surface, the dispersion structure being a substantially conical shaped depression in the second end, the light beams being emitted from the light emitting surface of the dispersion structure at a plurality of angles.
摘要:
Described is a light pipe having a first end receiving light beams from a light source, a light pipe body through which the light beams travel and a second end including a dispersion structure with a light emitting surface, the dispersion structure being a substantially conical shaped depression in the second end, the light beams being emitted from the light emitting surface of the dispersion structure at a plurality of angles.
摘要:
A solid-state imager is mounted in a reader, such as a bi-optical, dual window, point-of-transaction workstation, for capturing light along an optical axis over a field of view from coded indicia. An optical assembly including non-rotationally symmetrical optics is operative for optically modifying and asymmetrically magnifying an image of the indicia and the field of view of the imager along mutually orthogonal directions generally perpendicular to the optical axis, and for increasing resolution of the imager along one of the directions. Preferably, the non-rotationally symmetrical optics includes a cylindrical lens having an aspherical profile along the one direction, and a planar profile along the other of the directions.