Imaging Device Eyecup Assembly With Radial Mechanical Fixation
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Solution Overview
Problem
Conventional eyecups in imaging devices are prone to detachment and require space-inhibiting fixation methods, such as screws, which compromise space efficiency and appearance.
Innovation Solution
An eyepiece member configuration using a first and second member with integrated hole and protrusion groups for secure attachment without adhesives, allowing space-saving and reliable fixation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixing screw and groove shape are provided in the optical axis direction of the eyecup, then the eyecup can be securely fixed, but the size of the eyecup in the optical axis direction increases, inhibiting space saving
Solution Approach 1:
The patent transitions from fixing the eyecup in the optical axis direction (length dimension) to fixing it in the radial direction (width/depth dimensions). The hollow cover with its wall thickness provides a new dimensional space for insertion holes and fixing protrusions, allowing secure attachment without increasing the eyecup's length along the optical axis.
Solution Approach 2:
The fixing protrusions are nested within the wall thickness of the hollow cover structure. The insertion holes are formed through the cover wall, and the protrusions fit into these holes within the existing structural envelope, utilizing the wall space efficiently without adding external dimensions.
2Length of moving object
If adhesive is used to fix the eyecup, then space can be saved, but the fixation reliability decreases and detachment may occur
Solution Approach 1:
The patent replaces the chemical bonding mechanism (adhesive) with a mechanical fastening system. The fixing protrusions physically engage with the insertion holes through friction and geometric interlocking, providing reliable mechanical attachment that eliminates the need for adhesives while maintaining compact dimensions.
3Ease of operation
If the eyecup is made from an elastic member to improve comfort, then it becomes easily deformed when pulled, but this requires additional fixation measures that increase complexity
Solution Approach 1:
The patent divides the fixing function into two independent hole groups: first hole groups for attaching the eyecup to the hollow cover, and second hole groups for attaching the assembly to the main body. This segmentation allows the elastic eyecup to be securely fixed through distributed attachment points without requiring complex integrated fixation structures.
Solution Approach 2:
The patent applies different fixing mechanisms to different parts of the eyecup assembly. The eyecup itself maintains its elastic properties for comfort, while the hollow cover provides a rigid structural framework with precisely positioned holes for mechanical fastening. This local differentiation allows the elastic member to remain simple while achieving reliable fixation through the combined structure.
Data Source
AI summary
An imaging device is configured to include a finder and an eyecup unit. An eyecup is provided so as to surround an eyepiece window formed on a cover member. A base member holds the eyecup and the cover member. The eyecup is configured to include a curved and hollow eyepiece region, a first holding region comprising a first hole group, and a second holding region comprising a second hole group. The base member is configured to include a first protrusion group corresponding to the first hole group and a second protrusion group corresponding to the second hole group. The first hole group fits with the first projection group, and the second hole group fits with the second projection group.