Lens Apparatus Biasing Unit Tilt Retention Mechanism
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Solution Overview
Problem
Conventional lens apparatuses face challenges in maintaining the tilt direction of a lens support frame during reverse rotation of the moving barrel, leading to increased kinetic friction and torque requirements, which degrades optical performance and increases power consumption.
Innovation Solution
A lens apparatus with a biasing unit that applies first and second forces at different positions around the optical axis, with the components of these forces directed oppositely, to stabilize the lens support frame's orientation regardless of the moving barrel's rotation direction, using spring members between zoom lens units to reduce backlash and maintain consistent tilting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If multiple spring members are provided to apply large biasing forces to retain the tilt direction of a heavy lens support frame, then the tilt retention is improved, but the kinetic friction between cam grooves and cam pins increases
Solution Approach 1:
A tilt retaining member is introduced as an intermediary component between the spring members and the lens support frame. This member transmits the biasing force from the spring members to the lens support frame through cam grooves, reducing direct kinetic friction while maintaining tilt retention stability.
Solution Approach 2:
The invention replaces direct mechanical contact between spring members and the lens support frame with a cam mechanism system. The cam grooves and cam pins create a mechanical advantage that reduces friction while maintaining the required biasing force for tilt retention.
2Stability of the object's composition
If large biasing forces are applied to retain the tilt direction during reverse rotation, then the tilt stability is improved, but the torque necessary to rotate the moving barrel increases
Solution Approach 1:
The tilt retaining member acts as a mediator that reduces the direct transmission of large biasing forces to the moving barrel rotation mechanism. The cam groove geometry provides mechanical advantage, reducing the torque required to overcome biasing forces during rotation.
Solution Approach 2:
The cam groove profile is designed to dynamically adjust the transmission of biasing forces during rotation. The varying angle of the cam groove surfaces creates changing mechanical advantage throughout the rotation cycle, reducing peak torque requirements while maintaining tilt stability.
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
The solution effectively retains the tilt direction of the lens support frame without increasing the necessary torque for barrel rotation, stabilizing optical performance and reducing power consumption by minimizing variations in driving force across different directions.
Implementation Method 1
multiple spring members are provided between two zoom lens units to apply biasing forces evenly to the cam pins of each zoom lens unit
Implementation Method 2
Such increased biasing forces, however, increase the kinetic frictions generated between the cam grooves and the cam pins sliding therein
Data Source
AI summary
A lens apparatus of the present invention includes an optical unit that moves integrally in a direction of an optical axis and a biasing unit that applies a first force and a second force to the optical unit at different positions around the optical axis. In the lens apparatus, a direction of a component of the first force in the optical axis direction and a direction of a component of the second force in the optical axis direction are opposite to each other.