Light Emitting Device Thermal Deformation Neutral Axis Fixing
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Solution Overview
Problem
Existing light emitting devices experience thermal deformation issues due to heat generated by light emitting elements, leading to stress and warping of the housing and suppressing members, which can result in exposure and image formation failures.
Innovation Solution
A light emitting device configuration where a resin housing with a suppressing member, having a different linear expansion coefficient, is fixed to the housing at positions overlapping the neutral axis in the light emitting direction, using an adhesive that also overlaps the neutral axis, to suppress deformation caused by heat.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a suppressing member with different linear expansion coefficient is fixed to the resin housing, then thermal deformation is suppressed, but stress concentration occurs at the fixing portion
Solution Approach 1:
The patent applies local quality by positioning the fixing portion specifically at the neutral axis location of the housing. This strategic localization ensures that the adhesive bonding occurs where thermal expansion differences between the suppressing member and resin housing do not generate bending stresses, thereby suppressing stress concentration while maintaining thermal deformation suppression functionality.
2Stress or pressure
If the fixing portion is positioned at the neutral axis, then stress concentration is reduced, but manufacturing precision requirements increase
Solution Approach 1:
The patent applies equipotentiality by positioning the fixing portion at the neutral axis, which is a location of zero stress potential during thermal expansion. By bonding at this equipotential location, the system equalizes stress distribution across the housing-cross section, preventing stress concentration while the inherent geometry of the neutral axis provides natural alignment tolerance that reduces manufacturing precision requirements.
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 effectively reduces warping of the housing and suppressing member, preventing exposure and image formation failures by distributing thermal stress more evenly and maintaining structural integrity during light emission.
Implementation Method 1
the suppressing member having a linear expansion coefficient different from a linear expansion coefficient of the housing
Data Source
AI summary
A light emitting device includes a light emitting unit in which a resin housing extending in one direction holds a light emitting element emitting light in a light emitting direction intersecting the one direction, a suppressing member that extends in the one direction and suppresses deformation of the housing caused by heat, the suppressing member having a linear expansion coefficient different from a linear expansion coefficient of the housing, and a fixing portion that fixes the housing and the suppressing member to each other at a position overlapping, in the light emitting direction, a neutral axis of the housing or the light emitting unit or a neutral axis of the suppressing member in the light emitting direction, at plural places separated away from each other in the one direction or in a state of extending in the one direction.