Projector Light Guide Support Layout to Reduce Light Leakage
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Solution Overview
Problem
The use of metal lines for electrically coupling a circuit board and light emitting elements in a light source device results in a separate arrangement of the holder and circuit board, leading to light leakage through gaps and reduced light use efficiency.
Innovation Solution
A light source unit with a light guide member and support member configuration that includes first and second light emitting elements, metal wires, and a substrate, where the light emitting elements are opposed to the light guide member's third surface, and the support member supports the light guide member, with wiring terminals located between the fifth surface and a side wall, enhancing electrical coupling and reducing light leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If metal lines are used to electrically couple the circuit board and light emitting elements, then electrical coupling is achieved, but the holder and circuit board must be arranged separately causing light leakage through gaps
Solution Approach 1:
The patent merges the holder and circuit board into a single integrated structure where the circuit board is mounted on the holder's upper surface. This eliminates the gap between separate components that caused light leakage, while metal lines on the circuit board provide the necessary electrical coupling to light emitting elements.
Solution Approach 2:
The patent introduces a light reflecting member as an intermediary component positioned between the light emitting elements and the holder. This member reflects leaked light back toward the light guide member, converting what would be energy loss into useful light output.
2Ease of manufacture
If holder and circuit board are arranged separately to accommodate metal lines, then electrical coupling is enabled, but light use efficiency decreases due to light leakage
Solution Approach 1:
The patent combines the holder and circuit board into an integrated assembly where the circuit board is mounted on the holder's upper surface. This maintains ease of manufacture through standard mounting practices while eliminating the gap that caused light leakage, thereby improving light use efficiency.
Solution Approach 2:
The patent converts the potentially harmful light leakage into a beneficial effect by positioning a light reflecting member to redirect the leaked light back toward the light guide member. This transforms energy that would have been lost into useful light output.
3Reliability
If metal lines are used for electrical coupling, then connectivity is achieved, but gap formation between holder and circuit board causes light to leak
Solution Approach 1:
The patent merges the holder and circuit board into a single integrated structure, eliminating the gap that generated light leakage. The circuit board is mounted on the holder's upper surface with metal lines providing electrical connectivity, achieving both reliability and harm reduction.
Solution Approach 2:
The patent introduces a light reflecting member as an intermediary that intercepts light that would otherwise leak through gaps and redirects it back toward the light guide member, converting a harmful effect into a beneficial one.
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
The configuration improves light use efficiency by minimizing light leakage and optimizing electrical coupling, ensuring uniform light emission and enhanced light utilization.
Implementation Method 1
a light guide member which has an elongated shape along the first axis and on which the light emitted from the first light emitting element and the second light emitting element is incident
Implementation Method 2
a phosphor rod that converts excitation light emitted from each of the light emitting elements of the excitation light source into fluorescence
Data Source
AI summary
A light source device according to the present disclosure includes a light source unit including first and second light emitting elements, a substrate, and first and second metal wires, a light guide member on which light from the light source unit is incident, and a support member including a support groove. The light guide member has a first surface that emits light, a second surface opposite to the first surface, third and fourth surfaces facing opposite to each other, and fifth and sixth surfaces facing opposite to each other. In the light source unit, each light emitting element faces the third surface, the support groove includes a support surface facing the fourth surface and supporting the light guide member, and a first wall surface at a distance from the fifth surface, defining a first axis, a second axis perpendicular to the first axis, and a third axis perpendicular to the first and second axes, in a plan view along the third axis, each light emitting element has a rectangular outer shape, outer circumferential sides of the light emitting elements cross the first and second axes, first and second wiring terminals are located between the fifth surface and a first wall surface, and the first wall surface extends toward the light source unit beyond the third surface of the light guide member.