Spherical Camera Mount for Identity Verification Alignment
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Solution Overview
Problem
Low-cost cameras with varying positional relationships between their outer shell and angle of view can lead to inadequate image capture in identity verification systems, resulting in poor character recognition of identity verification documents.
Innovation Solution
An image reading apparatus with a camera fixed to a spherical surface via a sliding and rotational mechanism, allowing three-axis rotation and precise positioning to ensure accurate image capture, utilizing a retainer plate and screws for secure fixation and elastic force application to prevent unwanted rotation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If low-cost cameras are used to reduce manufacturing costs, then manufacturing cost is reduced, but manufacturing precision deteriorates because positional relationships between the camera outer shell and angle of view vary individually
Solution Approach 1:
The patent employs a spherical surface mechanism where the camera holder can rotate freely on a sphere. The spherical geometry ensures that regardless of individual camera variations, the camera can be positioned and oriented precisely by rotating the holder to align the camera's angle of view with the placement board, thereby compensating for manufacturing tolerances in low-cost cameras
Solution Approach 2:
The camera holder is designed to be dynamically adjustable rather than fixed. It can rotate about multiple axes (including vertical and horizontal axes) to adapt the camera's position and orientation. This dynamic adjustment capability allows the system to compensate for individual camera variations and achieve accurate image capture despite using low-cost cameras with inconsistent positional relationships
2Device complexity
If fixed mounting is used to simplify the structure, then device complexity is reduced, but manufacturing precision deteriorates because the camera cannot be adjusted for individual variations
Solution Approach 1:
The spherical mounting mechanism provides a simple yet effective solution. The camera holder rotates on a spherical surface, allowing multi-axis adjustment without complex mechanisms. The spherical geometry naturally accommodates rotations about multiple axes, enabling precise positioning while maintaining relative structural simplicity
Solution Approach 2:
The spherical mounting mechanism serves multiple functions: it allows rotation about vertical and horizontal axes, accommodates individual camera variations, and ensures proper alignment with the placement board. This multi-functional design achieves precise image capture without requiring separate adjustment mechanisms for each degree of freedom
Data Source
AI summary
An image reading apparatus includes a placement board, a camera that captures an image of a subject placed on the placement board, a first holding member to which the camera is fixed, a second holding member that is fixed to the placement board, and a fixing portion that fixes the first holding member to the second holding member, wherein a sliding surface along a spherical surface is formed on one of the first holding member and the second holding member, three contact points disposed at three different positions respectively are formed on the other one of the first holding member and the second holding member, the first holding member is rotatably supported about three axes by the second holding member as a result of the three contact points coming into contact with the sliding surface, and the camera is disposed inside the spherical surface.