MODULAR FOCUS SYSTEM FOR IMAGE BASED CODE READERS (AS AMENDED)
First Claim
Patent Images
1. An image-based code reader comprising:
- a lens mount secured within a housing;
a lens barrel rotatably received by the lens mount;
a sensor for capturing image data reflected from a target object;
an imager lens assembly fixedly secured within the lens barrel about an optical axis, wherein the imager lens assembly focuses the image data onto the sensor; and
a modular focusing system including a first removable lens attachment having a focus ring disposed at a target-facing end and a flange disposed at a sensor-facing end;
wherein the code reader is focused by adjusting the first lens attachment when secured to the code reader.
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Abstract
A modular focus system for image based code readers includes swappable lens attachments enables fixed focus, manual focus, and variable focus operation from a single reader. A manual focus lens cap includes a manually adjustable focus ring to change the focus of the reader. A variable focus lens module includes a liquid lens that is manipulated by a voltage delivered via a pair of electrodes to adjust the focus of the reader. The lens attachments can be swapped out and replaced as needed.
129 Citations
18 Claims
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1. An image-based code reader comprising:
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a lens mount secured within a housing; a lens barrel rotatably received by the lens mount; a sensor for capturing image data reflected from a target object; an imager lens assembly fixedly secured within the lens barrel about an optical axis, wherein the imager lens assembly focuses the image data onto the sensor; and a modular focusing system including a first removable lens attachment having a focus ring disposed at a target-facing end and a flange disposed at a sensor-facing end; wherein the code reader is focused by adjusting the first lens attachment when secured to the code reader. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A modular focus system for an image-based code reader, the system comprising:
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a lens mount having a receptacle; a lens barrel at least partially disposed within the receptacle; an imager lens secured about an optical axis within the lens barrel for converging reflected image data from an object onto a sensor; and a plurality of removable lens attachments for adjusting the focus of the reader, the plurality of lens attachments including; a manual focus lens attachment configured to be secured to the lens barrel such that rotation of the manual focus lens attachment translates into an axial movement of the imager lens relative to the sensor; and a variable focus lens module configured to be secured to the lens barrel such and electrically connected to a controller such that an output from the controller adjusts the focus of the code reader. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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17. A removable variable focus lens module for an image based code reader, the variable focus lens module comprising:
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a housing having a base and a cover, the base and cover defining a cavity and an opening extending through the housing about a module axis; a first electrical contact disposed within the cavity having at least one electrode extending therefrom generally parallel to the module axis; a liquid lens element; a spacer configured to center the liquid lens element about the module axis; a second electrical contact positioned in the cavity such that the first and second electrical contacts sandwich the liquid lens element; and a biasing element disposed between one of the first and second electrical contacts and one of the base and cover to hold the first and second contacts in electrical and mechanical contact with the liquid lens element; wherein the variable focus lens module is configured to be removably secured to the code reader such that the module axis generally aligns with an optical axis of the code reader. - View Dependent Claims (18)
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Specification