Lens Array Unit Mounting Structure Using Projections and Grooves
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Solution Overview
Problem
The existing methods for mounting a lens array unit in image reading devices using adhesives are inefficient, as they require maintaining the unit stationary and can lead to optical axis inclination and increased manufacturing costs.
Innovation Solution
A mounting structure featuring projections and grooves on the lens array unit and housing, allowing for secure engagement without adhesives, improving assembly efficiency and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If adhesive is used to secure the lens array unit, then the mounting can be achieved, but the assembly efficiency deteriorates and manufacturing cost increases
Solution Approach 1:
The patent replaces the adhesive-based chemical bonding system with a mechanical engagement system consisting of projections and grooves. The projections on the lens array unit engage with corresponding grooves in the housing to provide secure mounting without requiring adhesives, thereby eliminating the need for stationary jigs and improving assembly efficiency.
2Ease of manufacture
If adhesive is used to secure the lens array unit, then the mounting can be achieved, but the manufacturing cost increases
Solution Approach 1:
The patent extracts and eliminates the adhesive material from the mounting system by implementing a mechanical projection-groove engagement mechanism. This removes the need for adhesive substances entirely, reducing material costs and eliminating associated handling requirements.
3Manufacturing precision
If dedicated jig is used to maintain lens array unit stationary, then the mounting precision can be maintained, but the assembly efficiency deteriorates
Solution Approach 1:
The lens array unit is designed with self-aligning projections that automatically engage with the housing grooves during insertion. This self-service mechanism eliminates the need for external jigs or fixtures to maintain positioning precision, allowing workers to simply insert the unit without additional support equipment and thereby improving assembly efficiency.
4Device complexity
If projection is provided above the upper plane of the lens array unit, then the engagement structure is simplified, but the projection may be in contact with the glass plate causing instability
Solution Approach 1:
The patent applies local quality by positioning the projection structure at a specific location on the lens array unit holder rather than uniformly distributing engagement features. The projection is placed on the holder's peripheral portion at a height that ensures engagement with the housing groove without contacting the glass plate, providing both structural simplicity and mounting stability through localized feature placement.
Data Source
AI summary
A lens array unit mounting structure mounts a lens array unit in a recess provided in a housing of an image reading device. The structure includes a right projection and a left projection provided on the lens array unit and includes a right groove and a left groove provided in the recess of the housing. The lens array unit is secured in the recess of the housing by engaging the right projection with the right groove and engaging the left projection with the left groove.