Scheimpflug Code Reader Layout for Bright High-Speed Decoding
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Solution Overview
Problem
Existing code readers struggle to capture images of codes on moving workpieces with sufficient brightness at high speeds, limiting decoding processing efficiency.
Innovation Solution
A code reader with a Scheimpflug optical system and an illumination section positioned adjacent to the light receiving window, ensuring the illumination optical axis and lens optical axis are close, combined with a housing design that includes a light receiving window intersecting the focal plane, allowing for bright illumination and efficient heat dissipation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the moving speed of the workpiece is increased, then productivity is improved, but the exposable time for image capture is shortened resulting in insufficient image brightness
Solution Approach 1:
The patent applies the Scheimpflug principle which changes the geometric relationship between the lens optical axis, image plane, and focal plane. By making the image plane intersect the focal plane at an angle, the system captures images of the bottom surface of workpieces at high speeds while maintaining sufficient brightness, effectively solving the contradiction between high productivity and adequate illumination.
Solution Approach 2:
The patent changes the geometric parameters of the optical system by positioning the light receiving surface at an angle to the optical axis. This parameter change allows the imaging unit to capture bright images of codes on moving workpieces even at high conveyance speeds, resolving the contradiction between speed and image quality.
2Illumination intensity
If the illumination section is positioned close to the light receiving window, then illumination intensity on the workpiece is improved, but heat dissipation becomes more difficult
Solution Approach 1:
The patent divides the housing into multiple surfaces (first side surface with light receiving window, second side surface with heat dissipation portion) to separate the illumination function from the heat dissipation function. This segmentation allows the illumination section to be positioned close to the light receiving window for optimal illumination while providing a dedicated heat dissipation path through the heat sink structure on the opposite side of the housing.
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 high-speed image capture with sufficient brightness for decoding, reducing heat generation, and enhancing decoding processing speed.
Implementation Method 1
receives reflected light reflected from the bottom surface
Implementation Method 2
a lens for condensing reflected light from a code attached to a workpiece
Implementation Method 3
an illumination section that irradiates a workpiece with illumination light
Implementation Method 4
a heat sink that is thermally connected to the illumination section and that dissipates heat of the illumination section to outside
Data Source
AI summary
A code reader includes an illumination section, an imaging unit having a Scheimpflug optical system, a control unit that executes decoding processing on the code attached to a workpiece based on an image output from the imaging unit, and a housing that stores the illumination section, the imaging unit, and the control unit and has a light receiving window. The light receiving window is provided on the first side surface of the housing, and has a short side extending in a lateral direction and a long side, longer than the short side, extending in a longitudinal direction. A plane formed by the light receiving window intersects a plane formed by the focal plane of the Scheimpflug optical system. The illumination section is disposed adjacent to the light receiving window in the lateral direction of the light receiving window.