Interchangeable Lens Zoom Ring With Auto-Return Cam Structure
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Solution Overview
Problem
Existing lens devices face challenges in achieving a compact size while providing efficient and intuitive zooming operations, particularly in interchangeable lenses, due to the need for additional space for zoom mechanisms and lack of intuitive operation feedback.
Innovation Solution
A lens device with a zoom lever ring that includes an automatic return mechanism, utilizing a cam pin and springs to allow for variable-speed zooming and focusing operations, positioned closer to the image side within the lens barrel, and incorporating a button operation unit for intuitive control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the zoom mechanism is positioned closer to the image side, then the lens barrel diameter can be reduced, but the operation ring may interfere with the zoom mechanism
Solution Approach 1:
The operation ring is designed to rotate in a direction perpendicular to the optical axis (circumferential direction), while the zoom mechanism operates along the optical axis. This dimensional separation allows both components to coexist without interference, enabling the operation ring to be positioned close to the image side without affecting the zoom mechanism's operation.
Solution Approach 2:
The operation ring is divided into functional segments: a first operation ring for zooming operations and a second operation ring for focusing operations. Each ring can rotate independently in the circumferential direction, allowing separate control of zooming and focusing functions while maintaining compact positioning near the image side.
2Ease of operation
If a structure is added to generate opposite force on the operation ring, then automatic return function is achieved, but device complexity increases
Solution Approach 1:
The operation ring is equipped with an automatic return mechanism that uses a cam pin and spring to automatically return the ring to its initial position after zooming or focusing operations. This self-service function eliminates the need for manual resetting by the user, improving ease of operation while adding minimal complexity through the use of standard mechanical components.
Solution Approach 2:
A cam pin mechanism acts as an intermediary between the operation ring and the spring. The cam pin engages with a cam groove on the operation ring and transfers the spring's restoring force to return the ring to its initial position, providing a reliable automatic return function with moderate structural complexity.
3Adaptability or versatility
If multiple operation rings are provided, then operational versatility is improved, but the lens device size increases
Solution Approach 1:
Multiple operation rings (first operation ring for zooming, second operation ring for focusing) are merged into a single compact assembly on the lens barrel. Both rings share the same circumferential rotation mechanism and can be positioned close to the image side, allowing multiple functions without proportionally increasing the overall lens device size.
Solution Approach 2:
The operation rings are designed with universal circumferential rotation capability that can be used for both zooming and focusing operations depending on which ring is activated. This multi-functionality allows a single mechanical structure to support multiple operational modes, improving versatility while minimizing size increase.
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 a compact lens design with enhanced operational efficiency and intuitive zooming and focusing capabilities, allowing for variable-speed adjustments without increasing the lens barrel's diameter and providing tactile feedback for user control.
Implementation Method 1
a spring that biases the cam pin in the optical axis direction
Implementation Method 2
a spring that biases the cam pin in the optical axis direction
Implementation Method 3
a cam pin that is supported to be movable along an optical axis direction and a spring that biases the cam pin in the optical axis direction, and the cam pin is fitted into a cam groove, the cam groove being provided at the first operation ring
Data Source
AI summary
A lens device includes a lens barrel, a first operation ring that is provided on an outer periphery of the lens barrel and that is rotationally operated along a circumferential direction of the lens barrel, and a structure that generates, with respect to the first operation ring, a force in a direction opposite to a direction in which the first operation ring is operated, in which the first operation ring and the structure are disposed closer to an image side than a position of a stop disposed in the lens barrel.