Optical Device Light-Shielding Member Segmentation
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Solution Overview
Problem
Existing optical devices face molding failures when reducing the distance between through-holes in light-shielding members due to decreased resin fluidity, which is necessary for improved optical performance but leads to structural integrity issues.
Innovation Solution
The optical device incorporates a light-transmitting member with a light-shielding part on its surface to block light, using a configuration of alternating recessed and projecting portions in the light shielding wall to maintain optical axis alignment and prevent stray light, while maintaining sufficient resin thickness to prevent molding failures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the distance between through-holes in the light-shielding member is reduced to improve optical performance, then stray light is reduced and focal depth is increased, but resin fluidity deteriorates and molding failure occurs
Solution Approach 1:
The light-shielding member is divided into multiple independent light-shielding protrusions instead of forming through-holes in a continuous structure. Each protrusion is independently formed, allowing sufficient resin thickness between them to maintain molding quality while achieving the required light-shielding pattern. This segmentation resolves the contradiction by enabling reduced spacing between light-shielding elements without compromising resin fluidity during molding.
Solution Approach 2:
Instead of forming through-holes by removing material (subtraction method), the invention forms light-shielding protrusions by adding material (addition method). This inversion of the formation approach allows the resin to flow around the protrusions during molding, maintaining adequate fluidity and preventing molding failure while still achieving the desired light-shielding effect at reduced spacing.
2Object-affected harmful factors
If the distance between through-holes is reduced to block more stray light, then optical performance is improved, but the structural integrity of the light-shielding member deteriorates
Solution Approach 1:
The light-shielding function is segmented into multiple independent protrusions rather than relying on a continuous thin structure with through-holes. Each protrusion maintains sufficient thickness for structural integrity while collectively providing enhanced stray light blocking. The segmented structure allows reduced spacing between elements without compromising the strength of individual components.
Solution Approach 2:
The light-shielding protrusions are designed with optimized local dimensions, including sufficient thickness in the optical axial direction and appropriate width, to provide both effective light shielding and structural strength. This local optimization allows reduced spacing between protrusions while maintaining the structural integrity of each individual light-shielding element.
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
This configuration enhances optical performance by reducing stray light and increasing focal depth without compromising the structural integrity of the light-shielding member, preventing molding failures even at reduced through-hole distances.
Implementation Method 1
a light-shielding part that is provided on a surface of the light-transmitting part and blocks passage of light
Implementation Method 2
a lens member including plural lenses arranged such that optical axes of the lenses are substantially parallel to one another
Data Source
AI summary
An optical device includes: a lens member including a plurality of lenses arranged such that optical axes of the lenses are substantially parallel to one another; and a light-transmitting member including: at least one light-transmitting part that is disposed to face the lens member, positioned on the optical axis of some of the plurality of lenses, and transmits light; and a light-shielding part that is provided on a surface of the light-transmitting part and blocks passage of light.