摘要:
Laser power control arrangements interrupt power to a laser used in electro-optical readers upon detection of an over-power condition not conforming to preestablished regulatory standards. In one embodiment, during an operational mode, a difference between laser drive currents at two operating points is compared to a difference between laser drive currents at the same two operating points during a calibration mode. The over-power condition is recognized when the difference during the operational mode exceeds the difference during the calibration mode by a predetermined amount. In another embodiment, the laser is only energized to emit the beam at a reduced power level well below regulatory standards for staring at even if a motor drive failed.
摘要:
An imaging assembly in an imaging reader for electro-optically reading indicia includes a solid-state imager having an array of image sensors, and a focus control element, such as a liquid imaging lens, having a variable transfer function characteristics for capturing, optically modifying and directing return light from the indicia over a field of view onto the imager for processing into an electrical signal indicative of the indicia during a reading mode of operation; and a controller for controlling the imaging assembly to optically modify the return light in accordance with a known transfer function stored in a memory accessible to the controller during a calibration mode of operation prior to the reading mode.
摘要:
In an imaging reader for reading a target located in a range of working distances from the reader, a solid-state imager captures light from the target, and an optical assembly visually illuminates the target to aid an operator in aiming the imager at the target, and also visually indicates to the operator the range of working distances from the imager to the target.
摘要:
A MEMS-based reader has an extended range of working distances for reading bar code symbols. A digitizer resolves the edges of bar code symbols when located at far-away distances from the reader within the working range. The digitizer includes a differentiator for differentiating the analog signal to generate a first derivative signal, a peak detector for detecting voltage peaks in the first derivative signal, and a comparator for comparing voltage drops after the voltage peaks with a predetermined voltage value, and for determining the presence of each edge when each voltage drop at least equals, and preferably exceeds, the predetermined voltage value.
摘要:
Methods and apparatus for swipe image scanning comprising a scan stand and an imaging scanner. An exemplary scan stand comprises an illumination module and a receiving structure to receive the imaging scanner. Other embodiments further comprise a scan module, an illumination module, a processing unit, a detection component and memory. In an embodiment, the scan stand illuminates target dataforms brighter than the illumination from the scanner allowing for shorter exposure times and improved scanner performance.
摘要:
A trigger for initiating reading, and a lightpipe for displaying the results of the reading, together form an integrated molded assembly for installation into an electro-optical reader.
摘要:
An imaging-based bar code reader that includes an item guide to guide movement of an item including a target bar code such that target bar code passes through a field of view of the reader in a straight line. The reader further includes an imaging and decoding system to: 1) capture a series of images which include at least a part of the target bar code as the bar code is moved through the field of view of the reader; 2) sequentially analyze the series of captured images, for each captured image, identifying areas of the captured image representative of an image of the target bar code and decode decodable portions of the imaged target bar code; and 3) combining the decoded portions of the imaged target bar code using a sequence stitching method to obtain a full decode of the target bar code.
摘要:
A target is uniformly illuminated with illumination light without specular reflections from a window and/or from the target in a field of view of a solid-state imager of an imaging reader to improve reader performance.
摘要:
A scan module includes a scan motor, a laser; a sensor; and a mirror module. The mirror module includes (a) a collection mirror having an opening and (b) a fold mirror having a first end physically coupled to the collection mirror. A second end of the fold mirror is separated by a gap from the collection mirror.
摘要:
Described are a scan motor and a method of its manufacturing. The scan motor may include a static substrate; a dynamic substrate coupled to the static substrate via at least one flexible spring; a magnet coupled to a first side of the dynamic substrate; and a reflective element coupled to a second side of the dynamic substrate.