摘要:
An apparatus includes (1) an imaging lens arrangement having an optical axis, (2) an aiming light source configured to project visible light through the imaging lens arrangement to create an aiming pattern on a target object, (3) an imaging sensor detecting light from the target object through the imaging lens arrangement, and (4) a folding mirror tilted relative to the optical axis of the imaging lens arrangement. The folding mirror is positioned both on the optical path from the imaging lens arrangement to the imaging sensor and on the optical path from the aiming light source to the imaging lens arrangement. Both the imaging arrangement and the aiming arrangement share the same imaging lens.
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.
摘要:
An apparatus includes (1) an imaging lens arrangement having an optical axis, (2) an aiming light source configured to project visible light through the imaging lens arrangement to create an aiming pattern on a target object, (3) an imaging sensor detecting light from the target object through the imaging lens arrangement, and (4) a folding mirror tilted relative to the optical axis of the imaging lens arrangement. The folding mirror is positioned both on the optical path from the imaging lens arrangement to the imaging sensor and on the optical path from the aiming light source to the imaging lens arrangement. Both the imaging arrangement and the aiming arrangement share the same imaging lens.
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.
摘要:
An imaging system for electro-optically reading a symbol located within a range of working distances from the system, utilizes a solid-state imager for capturing return light from the symbol and for generating an electrical signal indicative of the captured return light, and a controller for decoding the electrical signal into data indicative of the symbol A memory stores a known set of values for a plurality of optical characteristics of the symbol, such as size and contrast characteristics of the symbol when the symbol lies in a restricted zone within the range of working distances. The controller is 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 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:
An imaging-based bar code reader including: an imaging system for imaging a target bar code within a field of view of the imaging system and projecting light from the field of view onto a sensor array, the imaging system generating image frames of the field of view of the imaging system; the imaging systems including an imaging lens assembly having a plurality of lens and a selection drive mechanism to select between a first optical zoom position defining a first focal length and a first field of view for imaging a target bar code at a close range and a second optical zoom position defining a second focal length and a second field of view for imaging a target bar code at a far range, the second focal length being greater than the first focal length.
摘要:
An electro-optical reader for, and method of, reading a symbol, utilize a light source for emitting a light beam along a path, an optical assembly including a variable focusing element for focusing a major light fraction of the light beam between a range of working distances in which the symbol to be read is located along the path, and a controller for controlling the variable focusing element to have different focusing states. One of the focusing states is a reference focusing state in which the variable focusing element is operative for focusing the major light fraction at a reference focal plane. A detector assembly, including a detector aperture located at the reference focal plane, is operative for detecting an amount of a minor light fraction of the light beam, and for generating a self-calibration signal indicative of the reference focusing state when a predetermined amount of the minor light fraction has been detected. The controller is operative for processing the self-calibration signal to determine the reference focusing state for the variable focusing element during reading.
摘要:
A solid-state imager detects return light from a target, and generates an electrical signal corresponding to the return light. A controller processes the electrical signal into data indicative of the target during an imaging mode of operation. An imaging lens assembly captures, optically modifies and directs the return light over a field of view along an optical path onto the imager. The imaging lens assembly includes a variable liquid lens controlled by the controller for optically modifying the return light. The liquid lens has an entrance area and is located in close proximity to an aperture stop A plurality of solid lenses magnifies the aperture stop and has an entrance pupil larger in size than the aperture stop and the entrance area to increase throughput of the return light to the imager.
摘要:
A variable focus imaging lens assembly for an imaging-based bar code reader for imaging a target bar code within a field of view of the imaging system, the imaging lens assembly comprising a simplified zoom lens assembly or system that provides for both focusing and adjustment of focal length of the imaging lens assembly with movement of a single group of movable lenses using one motor. The zoom lens assembly includes a stationary lens group comprising a plurality of stationary lenses and a movable lens group comprising a plurality of movable lenses movable with respect to a sensor array of the imaging system. The movable lens group is driven by a motor along a path of travel parallel to an optic axis of the imaging lens assembly, at least one lens of the plurality of stationary lenses being intermediate a pair of lenses of the plurality of movable lenses.