Camera Viewfinder Field of View Adjustment Mechanism
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Cameras with extendable lens barrels face difficulties in macro photography due to the object not fitting within the viewfinder's field of view, making it challenging to perform macro operations effectively.
Innovation Solution
A camera design that includes a housing with a viewfinder, a lens barrel with an extendable unit, and a mechanism using a drive lever and prism to adjust the field of view through the viewfinder based on the lens barrel's extended state, allowing for easy adaptation of the viewfinder's field of view during macro photography.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the lens barrel is extended for macro photography, then the photographing distance is reduced, but the object does not fit within the viewfinder's field of view
Solution Approach 1:
The viewfinder field of view is made dynamic by introducing a movable prism that can change its position based on the lens barrel extension state. When the lens barrel is extended for macro photography, the prism moves to alter the optical path, thereby dynamically adjusting the field of view to accommodate close-up subjects.
Solution Approach 2:
The system implements feedback by detecting the lens barrel extension state and automatically adjusting the prism position accordingly. The extension detection unit monitors when the lens barrel is extended, and this information feeds back to the prism moving mechanism, which then adjusts the viewfinder field of view to match the macro photography mode.
2Device complexity
If a fixed viewfinder field of view is used, then the structure is simple, but it cannot adapt to different photographing modes
Solution Approach 1:
The viewfinder transitions from a fixed to a dynamic structure by incorporating a movable prism. The prism can be positioned at different locations based on the photographing mode, allowing the same viewfinder structure to adapt to both normal and macro photography without requiring completely separate viewfinder systems.
Solution Approach 2:
The viewfinder is designed with multi-functionality by enabling a single prism to serve multiple purposes. The same prism structure can adjust the field of view for different photographing modes (normal and macro), eliminating the need for separate viewfinder systems for different modes and achieving versatility with controlled complexity.
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 seamless macro photography by dynamically changing the viewfinder's field of view in response to the lens barrel's extension, ensuring the object is always within the visible area, enhancing the camera's operational capabilities.
Implementation Method 1
a prism that changes a direction of a field of view visible through the viewfinder portion
Data Source
AI summary
A camera includes a viewfinder portion causing a frontward field of view to be visible through a viewfinder, and a drive lever rotatable about a shaft. An operation cylinder operable to extend and contract an extendable unit includes a guide surface extending in a circumferential direction and a recess adjacent to the guide surface. The drive lever includes an actuation portion that comes in contact with the guide surface of the operation cylinder. The camera further includes an urging member urging the actuation portion in the drive lever, a prism that changes a direction of a field of view visible through the viewfinder portion, and a prism guide lever rotatable about a shaft. The prism guide lever includes a prism holder holding the prism, and a follower gear meshing with a drive gear in the drive lever. The prism holder is placeable into the viewfinder portion.