Gradient Index Lens Array for Compact Document Imaging
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Solution Overview
Problem
Document processing devices face space constraints due to mechanical rollers used for transporting documents, which occupy space and require additional space for elongated transport paths to prevent light interference between contact image sensors.
Innovation Solution
A document processing device with a transport mechanism and sensor arrangement utilizing a gradient index lens array to collect and transmit light reflected from documents, allowing for compact design by eliminating the need for mechanical rollers and optimizing sensor placement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If mechanical rollers are used to transport documents and hold them tight to contact image sensors, then document imaging is achieved, but the device occupies more space and requires an elongated transport path
Solution Approach 1:
The patent replaces mechanical rollers with a gradient index lens array that uses optical fields to hold documents tight to the contact image sensor. The gradient index lens array creates optical forces that replace the mechanical holding function, eliminating the need for physical rollers and reducing device volume.
Solution Approach 2:
The patent introduces an optical field as an intermediary between the document and the contact image sensor. The gradient index lens array generates this optical field that acts as a mediator to hold the document in place, replacing direct mechanical contact with field-based interaction.
2Adaptability or versatility
If two contact image sensors are positioned downstream from one another to prevent light leakage, then both surfaces of documents can be imaged, but the transport path becomes elongated and requires more space
Solution Approach 1:
The patent transitions from a linear downstream arrangement of sensors to a side-by-side configuration. By positioning sensor arrangements on opposite sides of the transport path, the system uses spatial dimensionality to prevent light interference without requiring elongated transport paths, enabling dual-surface imaging in a compact footprint.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables efficient document imaging with high resolution, allowing for the extraction of alphanumeric characters while maintaining a compact footprint, reducing the overall size and weight of the device.
Implementation Method 1
a gradient index lens array. The gradient index lens array is configured to collect light reflected from the surface of the one of the documents and to transmit at least a portion of the collected reflected light onto the photodetector array
Implementation Method 2
The photodetector array generates one or more electrical signals in response to the gradient index lens transmitting at least a portion of the collected light reflected thereon
Data Source
AI summary
A document processing device includes a controller and a sensor arrangement. The sensor arrangement illuminates a surface of documents. The gradient index lens array collects light reflected from the documents and transmits at least a portion of the collected reflected light onto a photodetector array. The photodetector array generates one or more electrical signals in response to a gradient index lens transmitting light thereon. The controller derives data including image data from the one or more electrical signals. The image data is reproducible as a visually readable image of the surface of the documents. The visually readable image has a resolution such that alphanumeric characters can be extracted from the visually readable image in response to the document remaining within a depth of field of the gradient index lens array while being transported via the transport mechanism. The depth of field is at least about 0.03 inches.