Bow String Viewfinder with Conical Sectors for Glare Reduction
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Solution Overview
Problem
Current bow viewfinders face limitations in alignment due to the size of their central opening, suffer from deformation and displacement during string rotation, and are prone to reflections from sunlight, leading to shooting errors.
Innovation Solution
A viewfinder with a through-hole divided into three sectors, featuring concentric conical reductions and an annular geometry to maintain circular vision during string rotation, combined with a hood-type body to reduce light entry and inclined grooves for secure attachment to the bow string, preventing reflections and ensuring precise alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the through-hole is made larger to improve alignment capacity, then the alignment precision is improved, but light reflections and sparkles increase causing shooting errors
Solution Approach 1:
The through-hole is divided into three distinct sectors: two end sectors with conical reductions and one inner annular sector. This segmentation allows each sector to serve a specific function - the end sectors control light entry angles while the inner sector provides the viewing path, thus maintaining alignment precision while reducing harmful light reflections
Solution Approach 2:
Different sectors of the through-hole are given different geometric properties. The end sectors have conical reductions with specific angles (20°-45°) to control light reflection, while the inner sector maintains a different geometry for optimal viewing. This local differentiation allows the hole to simultaneously achieve precise alignment and minimize reflections
2Device complexity
If the viewfinder is fixed with only two trails to simplify structure, then the device complexity is reduced, but the stability during shooting is worsened due to displacements from abrupt blows
Solution Approach 1:
Multiple trails (at least three) are combined into an integrated fastening system where the trails work together to secure the viewfinder to the bow string. This merging of multiple attachment points creates a more stable and reliable connection that resists displacement from abrupt blows while maintaining reasonable structural complexity
3Ease of operation
If the bow string is opened prior to shooting to enable shooting, then the shooting capability is improved, but the string rotation causes viewfinder displacement and centring errors
Solution Approach 1:
The conical reductions in the end sectors are designed in advance with specific angles (20°-45°) to preemptively compensate for string rotation. This preliminary geometric design ensures that even when the string rotates during opening, the light paths through the conical sectors maintain the correct alignment, preventing centring errors before they occur
Solution Approach 2:
The geometric parameters of the through-hole (conical angles, sector divisions) are specifically optimized to maintain alignment precision under rotational conditions. By changing the physical geometry of the viewing hole, the system maintains centring accuracy despite the dynamic rotation of the bow string during operation
Data Source
AI summary
Viewfinder for bow strings, aimed to be connected to a bow string such that a user may look through it and obtain a precise shot, which comprises an elongated body with a through-hole defined between a front side and a rear side, wherein the hole further comprises a first sector, a second sector and a third sector, designed to prevent the reflections produced inside the hole by the light beams hitting it from the exterior from propagating to the user.