Lens Apparatus Zoom Ring Operating Force Adjustment
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Solution Overview
Problem
Conventional lens apparatuses face challenges in miniaturization due to the need for increased pressing force to prevent unintentional rotation of the operating ring, which complicates providing a proper operating feel and increases the initial operating force, making it difficult to achieve both higher resistance and proper operability.
Innovation Solution
The lens apparatus incorporates a first and second elastic member, along with a linear movement ring and zoom adjusting ring, where the linear movement ring moves in the optical-axis direction to adjust the pressing force on the operating ring, and a zoom adjusting rubber applies additional force to increase the necessary operating force without increasing the moving amount, thereby enhancing operability and preventing unintentional rotation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the pressing force of the elastic member is increased to prevent unintentional rotation of the operating ring, then the operating force necessary to operate the operating ring increases, but the initial operating force becomes too strong and it becomes difficult to provide a proper operating feel
Solution Approach 1:
The patent introduces a load adjusting ring that allows dynamic adjustment of the pressing force applied by the elastic member to the operating ring. This enables the operating force to be customized according to user preference, resolving the contradiction between preventing unintentional rotation and providing proper operating feel.
Solution Approach 2:
The patent changes the pressing force parameter of the elastic member by introducing a load adjusting ring with varying thickness. By adjusting the position of the load adjusting ring, the pressing force can be modified without changing the initial design parameters, allowing optimization of both reliability and ease of operation.
2Force
If the pressing force of the elastic member is increased to increase the operating force necessary to operate the operating ring, then the operating force increases, but the moving amount of the adjusting ring must be increased, impeding miniaturization
Solution Approach 1:
The patent uses a load adjusting ring with varying thickness to change the pressing force parameter of the elastic member. This allows increasing the operating force without requiring a larger moving amount of the adjusting ring, as the force adjustment is achieved through the geometric variation of the load adjusting ring rather than increased displacement.
Solution Approach 2:
The patent transitions from adjusting force through linear displacement to adjusting force through radial thickness variation of the load adjusting ring. This dimensional change allows force adjustment without proportionally increasing the moving amount, facilitating miniaturization while maintaining sufficient operating force.
3Force
If the initial operating force is made stronger to increase the pressing force of the elastic member, then the pressing force increases, but it becomes difficult to provide a proper operating feel
Solution Approach 1:
The patent introduces a load adjusting ring that allows continuous adjustment of the pressing force parameter. Instead of using a strong initial operating force, the system can be configured to provide the exact pressing force needed, optimizing the operating feel while maintaining sufficient pressing force for preventing unintentional 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
This configuration allows for increased operating force and improved operability of the zoom operating ring without enlarging the lens barrel, providing a stable and adjustable pressing force that enhances user experience and prevents malfunction.
Implementation Method 1
a first elastic member configured to press the first operating member
Implementation Method 2
a second elastic member configured to press the first operating member
Implementation Method 3
the first interposition is moved in the optical-axis direction without rotating around the optical axis and presses the first elastic member and the second elastic member
Data Source
AI summary
The lens apparatus includes a first operating member rotatable around an optical axis of an optical element so as to move the optical element in an optical-axis direction, a first elastic member configured to press the first operating member, a second elastic member configured to press the first operating member, a second operating member rotatable around the optical axis and movable in the optical-axis direction, and a first interposition provided between the first operating member and the second operating member. When the second operating member is moved in the optical-axis direction, the first interposition is moved in the optical-axis direction without rotating around the optical axis and presses the first elastic member and the second elastic member.