Lens Barrel Nut Member for Vibration Resistance
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Solution Overview
Problem
The existing locking screw in lens barrels has a small diameter, making it difficult to tighten, and is prone to loosening due to vibrations, leading to focus and zoom deviations and image noise from dust and vibrations.
Innovation Solution
A lens barrel design featuring a fixed and movable tube section with a nut member of larger diameter for secure attachment, an elastic member for vibration resistance, and a fixed diaphragm plate to prevent dust and noise, along with distinct knurling for easy identification and adhesive application to secure lenses in place.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a locking screw is used to fix the tube sections, then the relative rotation can be restricted, but it is hard to tighten due to its small diameter
Solution Approach 1:
The locking mechanism is segmented into two distinct components: a locking screw for initial positioning and a locking nut for final securing. This segmentation allows each component to have optimized dimensions - the screw remains small for precise positioning while the nut provides a larger diameter for easy tightening with tools.
Solution Approach 2:
The locking nut acts as an intermediary element that transfers and amplifies the tightening force. By engaging with the threaded hole in the first tube section, the nut converts rotational motion into clamping force, making the tightening process easier while maintaining reliable fixation.
2Reliability
If a locking screw is used to fix the tube sections, then the relative rotation can be restricted, but it loosens due to vibrations
Solution Approach 1:
The locking system is divided into two functional parts: the locking screw that initially positions the tubes and prevents rotation, and the locking nut that provides additional clamping force to counteract vibrations. This segmentation allows each component to address specific aspects of vibration resistance.
Solution Approach 2:
The locking nut is installed beforehand to provide pre-compression and cushioning against upcoming vibrations. By tightening the nut before vibration exposure, the system creates a pre-loaded connection that resists loosening forces, protecting the focal point position from shifting during operation.
3Adaptability or versatility
If the lens barrel is detachably attached to the camera body, then the adaptability is improved, but the relative rotation may occur due to vibrations
Solution Approach 1:
The lens barrel system transitions from a static attachment to a dynamic locking mechanism. The detachable design allows for easy installation and removal, while the locking screw and nut provide dynamic adjustment capability. This enables the system to adapt between different camera bodies while maintaining reliable rotation restriction when locked in position.
Solution Approach 2:
Before exposing the detachable lens barrel to vibrations during operation, the locking mechanism is engaged to provide pre-compression and stabilization. This beforehand cushioning ensures that the detachable connection becomes vibration-resistant once locked, preventing relative rotation while maintaining the adaptability benefit of detachable design.
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 design effectively restricts relative rotation and positional shifts, prevents focus and zoom deviations, reduces image noise by minimizing dust entry, and facilitates easy attachment and detachment, while ensuring secure fastening and easy identification of components.
Implementation Method 1
a first pitch screw section (10d, 20d, 30d) being formed on an inner peripheral surface (10c, 20c, 30c) of the fixed tube section (10, 20, 30)... a second pitch screw section (11b, 21b, 31b) formed on an outer peripheral surface (11a, 21a, 31a) of the movable tube section (11, 21, 31)... the second pitch screw section (11b, 21b, 31b) is threadedly engaged with the first pitch screw section (10d, 20d, 30d)
Implementation Method 2
an elastic member (33) located between the fixed tube section (10, 20, 30) and the movable tube section (11, 21, 31) so as to energize the movable tube section (11, 21, 31) in the optical axis direction
Implementation Method 3
an adhesive is coated on a portion where the third pitch screw section and the fourth pitch screw section are abutting on each other such that the second side movable tube section (211, 311) is attached to the first side movable tube section (210, 310)
Data Source
Figure 1
Figure 2(a)~2(b)
Figure 3(a)~3(d)
AI summary
A lens barrel (1,2,3) comprising: a fixed tube section (10,20,30) that is mounted to a camera body (B); a movable tube section (11,21,31) that is movably screwed to the fixed tube section (10,20,30); and a nut member (12,22,32) that, screwed to the movable tube section (20), is abutting on the top end (10b) of the fixed tube section (10,20,30). The nut member (12) acts as a double nut, preventing rotation of the fixed tube section (10, 20, 30) and the movable tube section (11, 21, 31) relative to each other.