Optical Member Structure for Blind-Area Visibility Under External Light
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Solution Overview
Problem
Existing blind area assisting devices with semi-transmissive mirrors are costly due to numerous components, and replacing them with a light guide body alone leads to reduced visibility from external light interference.
Innovation Solution
An optical member comprising a light guide body with reflecting surfaces and prisms, and a light shielding member that maintains a space from the reflecting surfaces to prevent external light interference, using protruding portions and connection surfaces to stabilize the light shielding member.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a light guide body alone is used to replace semi-transmissive mirrors, then device complexity and cost are reduced, but visibility is reduced due to external light interference
Solution Approach 1:
A light shielding member is introduced as an intermediary element between the light guide body and the external environment. This member selectively blocks harmful external light while allowing useful light from the blind area to pass through, resolving the contradiction between simplification and protection against interference
2Object-affected harmful factors
If a light shielding member is placed in contact with the light guide body to block external light, then external light interference is reduced, but the light shielding member becomes unstable due to thermal deformation and vibration
Solution Approach 1:
Protruding portions are designed in advance to create a buffer space between the light shielding member and the light guide body. This pre-established cushioning space prevents direct contact, thereby maintaining stability against thermal deformation and vibration while still blocking external light
3Stability of the object's composition
If the light shielding member is separated from the light guide body to improve stability, then stability is improved, but external light interference increases
Solution Approach 1:
The light shielding member is designed with non-uniform structure: it has a light shielding surface that contacts or approaches the light guide body at specific locations to block external light, while having protruding portions at other locations to maintain stability. This local differentiation of function resolves the contradiction between contact for blocking and separation for stability
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 solution maintains visibility in blind areas by reducing external light interference and stabilizing the light shielding member, thereby enhancing the visibility of scenes through the light guide body.
Implementation Method 1
a first reflecting surface configured to reflect the light from the incident surface
Implementation Method 2
a second reflecting surface configured to reflect the light reflected by the first reflecting surface
Implementation Method 3
prisms configured to emit the light guided from the incident surface to an outside of the light guide body
Data Source
AI summary
An optical member includes a light guide body and a light shielding member. The light guide body includes an incident surface on which a light from a blind area is incident, a first reflecting surface configured to reflect the light from the incident surface, a second reflecting surface configured to reflect the light reflected by the first reflecting surface, prisms protruding from the first reflecting surface in a normal direction of the first reflecting surface, and a protruding portion protruding from the first reflecting surface in the normal direction. The light shielding member is in contact with the protruding portion to provide a space between the light shielding member and the first reflecting surface and covers the first reflecting surface to block a light incident toward the first reflecting surface from an outside of the light guide body.