Optical adjustment for increased working range and performance in electro-optical readers
First Claim
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1. An arrangement for electro-optically reading indicia having parts of different light reflectivity, comprising:
- a) a variable optical lens having a pair of light-transmissive liquids arranged along an optical path, the liquids being immiscible, of different optical indicies of refraction, and of substantially same density, one of the liquids having a shape in a rest state for optically modifying light passing through said one liquid along the optical path toward the indicia to have a first optical characteristic; and
b) a controller for applying a voltage across said one liquid to change the shape thereof, and for optically modifying the light to have a second different optical characteristic.
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Abstract
Working range is increased in an electro-optical reader or an imager for reading indicia by applying a voltage to a variable lens to change the shape of a liquid therein.
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Citations
20 Claims
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1. An arrangement for electro-optically reading indicia having parts of different light reflectivity, comprising:
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a) a variable optical lens having a pair of light-transmissive liquids arranged along an optical path, the liquids being immiscible, of different optical indicies of refraction, and of substantially same density, one of the liquids having a shape in a rest state for optically modifying light passing through said one liquid along the optical path toward the indicia to have a first optical characteristic; and
b) a controller for applying a voltage across said one liquid to change the shape thereof, and for optically modifying the light to have a second different optical characteristic. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A method of electro-optically reading indicia having parts of different light reflectivity, comprising the steps of:
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a) arranging a pair of light-transmissive liquids along an optical path to form a variable optical lens, the liquids being immiscible, of different optical indicies of refraction, and of substantially same density, one of the liquids having a shape in a rest state for optically modifying light passing through said one liquid along the optical path toward the indicia to have a first optical characteristic; and
b) applying a voltage across said one liquid to change the shape thereof, and optically modifying the light to have a second different optical characteristic. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification