Dual-Frame Contact Image Sensor Apparatus for Media Authenticity
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Solution Overview
Problem
Financial devices, such as ATMs, are limited by their internal frame structure, which is suitable for only one type of contact image sensor (CIS), making it impossible to switch between reflective and transmissive CISs, thereby restricting their ability to identify and process various media effectively.
Innovation Solution
A medium sensing apparatus with a dual-frame structure featuring overlapping sensor grooves and contact image sensors, allowing for the use of both reflective and transmissive CISs, enabling flexible identification of media by emitting and receiving light from different angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single-frame structure suitable for one type of CIS is used, then the device structure is simple, but the adaptability to different CIS types is poor
Solution Approach 1:
The patent implements a dual-frame structure where the first frame accommodates reflective CISs and the second frame accommodates transmissive CISs. Both frames share overlapping sensor grooves and can be selectively positioned, allowing the same apparatus to perform multiple sensing functions with different CIS types, thereby achieving universality without requiring completely separate systems.
Solution Approach 2:
The sensing apparatus is divided into two independent frame structures, each optimized for a specific CIS type. The first frame is configured for reflective CIS mounting while the second frame is configured for transmissive CIS mounting. This segmentation allows each frame to be independently designed and positioned, enabling flexibility in selecting which frame to use based on the required sensing mode.
2Ease of operation
If the frame structure is fixed for one CIS type, then the manufacturing cost is low, but the operational flexibility is limited
Solution Approach 1:
The patent introduces a dynamic positioning mechanism that allows the first and second frames to be moved between different positions. The frames can be selectively positioned based on operational requirements - using the first frame for reflective CIS operations and the second frame for transmissive CIS operations. This dynamic adaptability enables the system to change its configuration according to the specific sensing task at hand.
3Measurement precision
If overlapping sensor grooves are used in dual frames, then the measurement precision is improved, but the device complexity increases
Solution Approach 1:
The patent designs the first and second frames with overlapping sensor grooves that are positioned to coincide when both frames are in their respective operating positions. This merging of sensor groove locations allows the same physical space to serve dual purposes - supporting both reflective and transmissive sensing operations with different CIS types, thereby improving measurement precision through consistent sensor positioning while minimizing the overall structural 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 accurate and versatile identification of media, enhancing the financial device's capability to process different types of media by allowing the use of both reflective and transmissive CISs within the same apparatus, improving user satisfaction and operational efficiency.
Implementation Method 1
a reflective CIS which reflects light against a surface of a medium to identify the medium by using the reflected image
Implementation Method 2
a transmissive CIS which transmits light through a surface of a medium to identify the medium by using an overlap image of front and rear surfaces of the medium
Data Source
AI summary
Provided is a medium sensing apparatus. The medium sensing apparatus comprises a first frame disposed on a transfer path of a medium, the first frame having a plurality of first sensor grooves, a second frame facing the first frame, the second frame having a plurality of second sensor grooves, a plurality of first contact image sensors disposed in the plurality of first sensor grooves, respectively, and a plurality of second contact image sensors disposed in the plurality of second sensor grooves, respectively. At least one of the plurality of first sensor grooves and at least one of the plurality of second sensor grooves are disposed to partially overlap with each other.