Shutter Cam Flange Roller Axis Alignment
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional shutter apparatuses face challenges in easily adjusting the charge lever operation and stabilizing the traveling characteristics of the blade group, leading to increased sliding load and size issues due to the separate rotating axes of the blade arm and driving member, which affects shutter accuracy and miniaturization.
Innovation Solution
The shutter apparatus incorporates a cam member with a flange and rollers attached to axis portions, allowing the charge lever to be easily adjusted and the blade driving member to be supported on the same side of the shutter base plate, reducing sliding load and enabling miniaturization by aligning the blade arm and driving member on the same axis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a roller is used to adjust overcharge amount of the blade driving member, then the charge lever operation can be adjusted, but the roller requires a retaining member that must be dismounted when exchanging the roller, making the exchange troublesome
Solution Approach 1:
The charge lever is divided into a main body and a separate roller that can be independently exchanged. The roller is detachably attached to the charge lever, allowing the roller to be replaced without disassembling the entire charge lever assembly or requiring retaining members.
Solution Approach 2:
The roller is extracted as a separate, independently replaceable component from the charge lever mechanism. This allows the roller to be easily removed and exchanged without affecting other parts of the charge lever assembly, eliminating the need for retaining members.
2Ease of operation
If the roller is arranged at a position left from the rotating center of the blade driving member, then the charge operation can be performed, but the inertia of the blade driving member is widely affected and travelling characteristics are changed by size of the roller
Solution Approach 1:
The position of the roller is changed from being left of the rotating center to being arranged substantially at the rotating center of the blade driving member. This parameter change reduces the impact on inertia and stabilizes the traveling characteristics while maintaining charge operation functionality.
3Ease of manufacture
If the blade driving member and blade arm are provided on separate surfaces of the shutter base plate, then the structure can be formed, but attachment error is generated and the apparatus enlarges
Solution Approach 1:
The blade driving member and blade arm are merged onto the same surface of the shutter base plate, specifically the image-pickup element side. This eliminates the need for separate mounting surfaces, reducing attachment errors and improving alignment accuracy between the rotating axes.
Solution Approach 2:
The arrangement changes from using separate surfaces (z-dimension separation) to using the same surface (x-y plane arrangement). By positioning both components on the same surface of the shutter base plate, the design eliminates the thickness dimension issue and achieves better alignment.
4Ease of manufacture
If the blade group fits the rotating axis of the blade arm and the rotating axis of the blade driving member, then the structure can be formed, but travel sliding load increases and shutter accuracy degrades
Solution Approach 1:
The blade group is extracted from the fitting relationship with the rotating axes. Instead of fitting both rotating axes, the blade group is designed to fit only the rotating axis of the blade arm, eliminating the sliding contact with the blade driving member's rotating axis and reducing sliding load.
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 simplifies the adjustment of the charge lever, stabilizes the traveling characteristics of the blade group, reduces sliding load, and miniaturizes the shutter apparatus by ensuring the blade arm and driving member operate on the same axis, enhancing shutter accuracy and reducing size.
Implementation Method 1
a blade driving member having a drive spring for blade travelling
Implementation Method 2
the blade group is held at a start position by magnetic force of the energized holding magnetic
Implementation Method 3
a cam member configured to rotate the charge lever, and a second roller which is attached to a second axis portion extending from the charge lever and is configured to trace a cam portion formed on the cam member
Data Source
AI summary
A shutter apparatus includes a shutter base plate having an aperture, a blade group configured to open and close the aperture, a blade driving member configured to drive the blade group, a charge lever configured to rotate the blade driving member, a first roller which is attached to a first axis portion extending from the blade driving member and abuts against the charge lever, a cam member configured to rotate the charge lever, and a second roller which is attached to a second axis portion extending from the charge lever and is configured to trace a cam portion formed on the cam member. The cam member has a flange protruding from the cam portion to periphery of the cam member. And the cam member is arranged so that the second roller is overlapped with the flange in an extending direction of the second axis portion.