Light Guiding Body with Varying Width Adjusting Portion
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Solution Overview
Problem
Existing light guiding bodies in image reading apparatuses face challenges in smoothly varying emitted light quantity distribution and suffer from increased component count and cost, as well as low heat dissipation efficiency, which affects the longevity and performance of LEDs due to heat generation.
Innovation Solution
A light guiding body with a translucent body featuring a light incident surface, a light emitting surface, and a light emitting quantity adjusting portion with varying width along its longitudinal direction, allowing for controlled light emission and improved heat dissipation by protruding ends and strategically placed heat dissipation plates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a sawtooth-shaped light reflecting surface is formed with adjusted inclination angles, then the emitted light quantity distribution can be controlled, but the manufacturing complexity and cost increase
Solution Approach 1:
The patent changes the geometric parameters of the light emitting quantity adjusting portion, specifically varying the width of the adjusting portion along the longitudinal direction of the light guiding body. This parameter change allows control of the emitted light quantity distribution without requiring complex inclination angle adjustments, thereby resolving the contradiction between illumination control and manufacturing ease.
2Illumination intensity
If multiple light emitting devices are disposed on the end surface, then the emitted light quantity distribution can be adjusted, but the number of components and cost increase
Solution Approach 1:
The patent merges the functions of multiple light emitting devices into a single light guiding body by forming a light emitting quantity adjusting portion on its surface. This single structure performs the light quantity adjustment function that would otherwise require multiple separate devices, thereby reducing component count and cost while maintaining the ability to control emitted light distribution.
Solution Approach 2:
The light guiding body is designed with multi-functionality: it guides light from the light emitting device, adjusts the light quantity distribution through its light emitting quantity adjusting portion, and provides structural support. This universal design eliminates the need for separate adjustment mechanisms or multiple devices, resolving the contradiction between illumination control and device complexity.
3Volume of moving object
If LEDs are disposed inside the casing, then the structure is compact, but heat dissipation efficiency decreases affecting LED lifespan
Solution Approach 1:
The patent introduces heat dissipation plates as intermediary components between the LEDs and the surrounding environment. These plates facilitate heat transfer from the LEDs to the external environment, enabling effective heat dissipation even when LEDs are disposed inside the casing. This resolves the contradiction between compact structure and LED reliability by mediating the heat transfer process.
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 smooth variation of emitted light quantity distribution without increasing components or costs, while enhancing heat dissipation efficiency, thus prolonging LED lifespan and improving apparatus performance.
Implementation Method 1
light from a light emitting device (light source) is incident to an end surface of the light guiding body in the longitudinal direction so that the light is propagated in the light guiding body
Implementation Method 2
the light is directly emitted from the light emitting surface of the light guiding body, and furthermore is reflected by the light reflecting surface so as to be emitted from the light emitting surface
Data Source
AI summary
A light guiding body includes a long translucent body, a light incident surface formed at an end of the body in a longitudinal direction of the body, a light emitting surface formed on one side surface of the body along the longitudinal direction of the body, and a light emitting quantity adjusting portion formed on the other side surface of the body along the longitudinal direction of the body so as to be opposite to the light emitting surface. The light guiding body guides, in the body, light incident to the light incident surface, reflects the light by the light emitting quantity adjusting portion, and emits the light from the light emitting surface. A width of the light emitting quantity adjusting portion of the body in a direction perpendicular to the longitudinal direction of the body is varied according to a position in the width in the longitudinal direction.