Dome Cover Joint Cross-Section to Prevent Total Reflection
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Solution Overview
Problem
Surveillance camera devices with dome covers experience image quality deterioration due to the joined parts, leading to total reflection of light at the joint areas, which affects the formation of desired images.
Innovation Solution
The dome window is designed with a joint cross-section that has a predetermined inclination relative to the imaging light beam direction, minimizing the distance between the lens and the joint, and using a light-transmissive adhesive with refractive indices matching or differing from the dome window materials to prevent total reflection, ensuring the joint does not parallel the optical axis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If two covers are joined to each other to form a dome cover, then the viewing range can be extended to 180 degrees or more, but image quality deteriorates at the joined part due to total reflection of light
Solution Approach 1:
The dome cover is divided into two separate covers (first cover and second cover) that are joined together. This segmentation allows the dome cover to achieve a viewing range of 180 degrees or more while enabling optical design optimizations at the joint portion to minimize image quality deterioration through total reflection.
Solution Approach 2:
The joint portion of the two covers is designed with specific local optical characteristics, including positioning the joint at locations where total reflection is minimized and using light-transmissive adhesive with appropriate refractive indices. This local optimization ensures that the joined part does not significantly deteriorate image quality while maintaining the extended viewing range.
2Ease of manufacture
If a joint is provided between two covers, then the dome cover can be manufactured and assembled more easily, but total reflection occurs at the joint causing image quality deterioration
Solution Approach 1:
A light-transmissive adhesive is used as an intermediary material at the joint portion between the two covers. The adhesive is specifically selected to have refractive indices that match or differ appropriately from the dome window materials, preventing total reflection of light at the joint interface while still providing effective bonding between the covers.
Solution Approach 2:
The refractive indices of the adhesive material are carefully selected and adjusted to optimize optical performance at the joint. By changing the optical parameters (refractive indices) of the adhesive, the design prevents total reflection of light at the joint interface, thereby maintaining image quality while preserving the manufacturing and assembly advantages of having a jointed structure.
3Reliability
If the joint cross-section is inclined relative to the imaging light beam direction, then total reflection is prevented and image quality is maintained, but the joint cannot be positioned along the optical axis
Solution Approach 1:
The joint cross-section is designed with an asymmetric inclination relative to the imaging light beam direction. This asymmetric positioning ensures that the joint does not parallel the optical axis, thereby preventing total reflection of light and maintaining image quality. The joint is strategically positioned and angled to optimize optical performance while still providing structural support for the dome cover.
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 prevents total reflection of light at the joint, maintaining image quality and allowing for effective imaging even when the dome window is divided into sections, thus ensuring minimal deterioration in captured image quality.
Implementation Method 1
an incidence angle of light which is adapted to be incident to the joint from the imaging apparatus is smaller than a predetermined angle which does not cause total reflection
Implementation Method 2
using a light-transmissive adhesive with refractive indices matching or differing from the dome window materials to prevent total reflection
Data Source
AI summary
A cover surrounds an imaging apparatus of capturing an image. The cover includes a first section that forms a part of the cover and includes a first joint end, a second section that forms a part of the cover and includes a second joint end, and a joint that is provided between the first joint end of the first section and the second joint end of the second section. An incidence angle of light which is adapted to be incident to the joint from the imaging apparatus is smaller than a predetermined angle which does not cause total reflection.