System and method employing a piezoelectric reflector for optimizing the focus of a dataform reader
AssigneeTelxon Corporation
InventorPeter Merchant
Life of this patent
Estimating the term…
Abstract
A dataform reader module is provided utilizing a piezoelectric reflector with a reflecting angle that is adjustable to provide for an optimal focus of an image projected onto a photosensor array. A distance measurement device can provide a distance measurement utilized in adjusting the piezoelectric reflector, such that an optimal focus can be made without the use of multiple lenses and/or reflectors. Alternatively, various dataform readings can be performed to find the optimal focus without employing a distance measurement device. Additionally, distance measurements and readings can be performed on segments of the dataform and the dataform reconstructed after all of the readings have been performed.
Claims37
A dataform reading module, comprising:
- a photosensor;
- a lens for focusing a respective image representing a dataform taken along a target line onto the photosensor;
- a single layer piezoelectric reflector configured to direct an image of the dataform taken along the target line onto the lens, the piezoelectric reflector being adjustable based on an optimal focus measurement;
- and
- an illuminating device for illuminating the dataform.
A dataform reader for reading a dataform, comprising:
- a hand-portable sized housing having at least one lens;
- a reading module included within the housing, the reading module including:
- a photosensor array;
- a single layer piezoelectric reflector for directing a respective image representing the dataform along a target line onto the at least one lens, the piezoelectric reflector being adjustable based on an optimal focus measurement, the at least one lens and the piezoelectric reflector being configured to focus an image of the dataform along the target line onto the photosensor array;
- and
- an illuminating device for illuminating the dataform.
A method for reading a dataform employing a dataform reading module, comprising the steps of:
- making an optimal focus measurement based on a focal length of the dataform reading module from the dataform;
- adjusting an angle of reflection of a single layer piezoelectric reflector based on the optimal focus measurement;
- focusing an image of the dataform taken along a target line reflected from the piezoelectric reflector through a lens assembly onto a photosensor array;
- and
- reconstructing a final image of the dataform taken along the target line.
Dependencies are inferred from the claim text.