Optical Reading Head Lens Movement and Base Stabilization
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Solution Overview
Problem
Conventional optical reading heads face increased accumulated tolerance and instability during focusing and magnification correcting operations, leading to reduced scanning performance and difficulties in lens replacement and maintenance.
Innovation Solution
The optical reading head design incorporates a sliding frame and a base with a gliding track on the casing, allowing the lens to move directly along the track for focusing and magnification correction, while the base is stabilized with complementary mating elements for secure movement, and includes a push rod for adjusting the image sensing module's alignment angle to correct sloped optical paths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the lens is moved indirectly on the casing via the base to perform focusing and magnification correcting operations, then the operations can be performed, but the accumulated tolerance of the optical reading head is increased and scanning performance is reduced
Solution Approach 1:
The patent divides the movement function into two independent segments: the lens moves independently along a gliding track for focusing operations, while the base moves independently for magnification correction. This segmentation eliminates the indirect movement chain, allowing the lens to move directly relative to the casing, thereby reducing accumulated tolerance while maintaining operational capability.
2Ease of operation
If a resilient clip element is disposed on the base to advance it along the gliding pedestal, then the base can be moved, but the base is readily sloped rightwards or leftwards and fails to be stably moved
Solution Approach 1:
The patent introduces asymmetric guiding structures consisting of complementary mating elements (protrusions and corresponding recesses) on the base and casing. These asymmetric features constrain the base to move only along the intended gliding track direction, preventing lateral sloping while maintaining ease of movement through the resilient clip element mechanism.
3Stability of the object's composition
If the lens is glued onto the base to fix its position after focusing and magnification correcting operations, then the position is fixed, but the combination of the lens and base must be replaced when the lens needs to be replaced for maintenance
Solution Approach 1:
The patent extracts the lens from the base structure by providing an independent mounting mechanism where the lens is fixed to the casing via the gliding track, separate from the base assembly. This allows the lens to be removed and replaced independently without replacing the entire base, improving maintainability while maintaining stable positioning through the track-glide mechanism.
Data Source
AI summary
An optical reading head of a scanning apparatus includes a casing, a lens, a base and a sliding frame. The base is used to support an image sensing module and movable on the casing. The sliding frame is coupled with the base for fixing and driving the lens to move along a gliding track on the casing. During the focusing operation, the lens' position is adjustable by moving the sliding frame and the optical signals are clearly imaged onto the image sensor of the imaging sensing module. During the magnification correcting operation, positions of the lens and the imaging sensing module are adjustable by moving the base and the tolerance of magnification for the optical reading head would be equal to or less than an acceptable preset value.