Light Amount Adjusting Apparatus Cam Phase Adjustment
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Solution Overview
Problem
Existing light amount adjusting apparatuses face difficulties in easy adjustment of blade position, leading to excessive rotation and complexity in adjusting the relative positional relationship between the cam member and light amount adjusting blade.
Innovation Solution
A light amount adjusting apparatus featuring a base member, blade driving member, cam member, and adjuster that allows for easy adjustment of the cam member's mount phase relative to the base member, utilizing an eccentric roller-shaped phase adjusting member to reduce adjustment sensitivity and facilitate aperture diameter changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the cam member is adjusted by rotating it directly, then the blade position can be adjusted, but the light amount adjusting blade may be excessively rotated by a slight rotation of the cam member, making the adjustment difficult to control
Solution Approach 1:
The patent introduces an adjuster as an intermediary mechanism between the cam member and the base member. This adjuster includes a first engagement portion that engages with a second engagement portion, allowing for controlled phase adjustment. The intermediary structure prevents direct rotation of the cam member, thereby avoiding excessive blade rotation while still enabling precise position adjustment through controlled engagement and disengagement of the adjustment portions.
2Adaptability or versatility
If the cam member is adjusted to change the mount phase, then the relative positional relationship between the cam member and light amount adjusting blade can be modified, but the adjustment process becomes complex and sensitive
Solution Approach 1:
The patent segments the adjustment mechanism into distinct components: the cam member, the base member with engagement portions, and the adjuster. This segmentation allows the mount phase adjustment to be performed through a simplified, modular mechanism rather than a complex integrated system. The first and second engagement portions are separated and can engage/disengage independently, reducing the overall complexity while maintaining adjustability.
3Manufacturing precision
If the cam member rotation is used to adjust blade position, then aperture diameter can be changed, but slight rotation causes excessive blade rotation leading to poor control
Solution Approach 1:
The adjuster serves as an intermediary that decouples the direct rotational relationship between the cam member and the blade. By using the engagement portions that can be controlled to engage and disengage, the system allows for precise aperture diameter adjustment without the sensitivity problems of direct rotation. The intermediary mechanism provides controlled, incremental adjustment rather than continuous sensitive rotation.
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
Enables easy and precise adjustment of the aperture diameter, improving the ease of use and accuracy in controlling light amount, reducing the risk of excessive rotation and simplifying the adjustment process.
Implementation Method 1
utilizing an eccentric roller-shaped phase adjusting member to reduce adjustment sensitivity and facilitate aperture diameter changes
Data Source
AI summary
A light amount adjusting apparatus includes a base member, light amount adjusting blades configured to form an aperture through which light passes, a blade driving member configured to rotate relative to the base member to drive the light amount adjusting blades, a cam member including a cam attached to the base member and configured to rotate the light amount adjusting blades driven by a rotation of the blade driving member so as to change a size of the aperture, and an adjuster configured to change a mount phase of the cam member relative to the base member in a rotational direction of the blade drive member.