Camera Lens Barrel Segmentation for Macro Photography Vignetting
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Cameras with flexible bellows for lens barrel extension face vignetting issues when performing different photographing operations, such as macro photography, due to the bellows being captured in the image and allowing entry of light and dust.
Innovation Solution
A camera design with a movable lens barrel comprising a rear and front lens barrel unit, each with a bellows system that adjusts to prevent vignetting by expanding or contracting to maintain the bellows outside the light beam during different photographing states, allowing for normal and macro photography without light or dust entry.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the lens barrel is extended further for macro photographing, then the photographing distance is reduced, but the bellows is captured in the image causing vignetting
Solution Approach 1:
The lens barrel is divided into multiple extendable sections with independent bellows, allowing differential extension. The front lens barrel unit can extend further than the rear unit, enabling macro photography without the rear bellows entering the light beam path and causing vignetting.
Solution Approach 2:
The solution transitions from a single linear extension to multi-level extension in different dimensions. The front lens barrel unit extends both axially and can be positioned to extend beyond the rear bellows, creating a three-dimensional arrangement that prevents the rear bellows from intercepting light.
2Device complexity
If a single bellows is used for lens barrel extension, then the structure is simple, but the bellows cannot remain outside the light beam during extended photography
Solution Approach 1:
The single bellows system is segmented into multiple bellows units corresponding to different lens barrel sections. Each bellows can expand and contract independently, allowing the rear bellows to remain retracted while the front section extends for macro photography, keeping all bellows outside the light beam path.
Solution Approach 2:
The bellows system becomes dynamically adjustable with each bellows unit capable of independent expansion and contraction. This dynamic configuration allows the system to adapt to different photographing modes, maintaining optimal positioning where no bellows obstruct the light beam regardless of extension distance.
3Adaptability or versatility
If the lens barrel is made extendable for different photographing operations, then the adaptability is improved, but the bellows may allow entry of light and dust
Solution Approach 1:
The lens barrel is segmented into multiple units with separate bellows for each section. This segmentation allows independent control of each bellows, enabling the system to maintain sealed configurations during different photographing operations while still achieving the necessary extension for both normal and macro photography.
Solution Approach 2:
Different sections of the lens barrel have different extension capabilities and bellows configurations tailored to their specific functions. The rear bellows are designed to remain compact to prevent dust entry and light leakage, while the front section has extended reach for macro photography, with each section optimized for its local requirements.
Data Source
AI summary
A camera can perform two different photographing operations with a lens at different positions without vignetting while preventing entry of light and dust. A camera includes a frame including a film compartment to contain a photographic film and a barrel extending from the film compartment in an optical axis direction, and a lens barrel movable in the barrel in X-direction. The lens barrel includes cylinders movable frontward relative to the barrel, and a cylinder movable frontward relative to the cylinder. The camera includes a rear bellows connecting the frame and the cylinder, and a front bellows connecting the cylinder and the cylinder. In a first photographing state in which the cylinders extend frontward relative to the barrel and the cylinder is accommodated inside the cylinder, the rear bellows is expanded and the front bellows is partially contracted. In a second photographing state, the cylinder extends frontward relative to the cylinder.