Lens Apparatus Guide Shaft Swinging for Optical Axis Inclination
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing lens apparatuses that adjust the optical axis using linear actuators and MR sensors suffer from inaccurate position detection due to random movements orthogonal to the optical axis, leading to deteriorated or lost detection accuracy.
Innovation Solution
A lens apparatus design that includes a first and second guide shaft, a swinging member, and a rotating member to adjust the optical axis inclination by swinging the second guide shaft horizontally or vertically, ensuring the MR sensor and magnet gap remains constant for stable position detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the optical axis is adjusted by rotating the guide shaft or bearing member, then the inclination of the optical axis can be corrected, but random movement in the orthogonal direction occurs causing deterioration of MR sensor position detection accuracy
Solution Approach 1:
The guide shaft system is divided into two independent guide shafts (first guide shaft and second guide shaft) that can be adjusted separately. The first guide shaft handles one direction of optical axis inclination while the second guide shaft handles the orthogonal direction, allowing independent optimization of each function and preventing coupled random movements that would affect sensor detection accuracy.
Solution Approach 2:
The eccentric cam part is extracted from the guide shaft and transferred to the lens frame. This separation allows the guide shaft to perform only its guiding function without the added complexity of eccentric rotation, while the lens frame independently handles the optical axis inclination adjustment through the eccentric cam mechanism, thereby eliminating random movements that would compromise sensor detection precision.
2Device complexity
If a single guide shaft with eccentric cam part is used to adjust optical axis inclination, then the structure is simplified, but random movement in orthogonal direction occurs affecting detection accuracy
Solution Approach 1:
The single guide shaft is segmented into two separate guide shafts (first guide shaft and second guide shaft), each dedicated to guiding the lens frame in specific directions. This segmentation, combined with the eccentric cam part being transferred to the lens frame, simplifies the overall structure by distributing functions across independent components rather than concentrating them in a single complex guide shaft assembly.
3Stability of the object's composition
If the guide shaft is fixed at both ends, then the structure is stable, but the optical axis inclination cannot be adjusted
Solution Approach 1:
The guide shaft system transitions from a fixed configuration to a dynamic adjustable configuration. The first guide shaft front end fixing part and rear end fixing part provide stable fixed connections for structural integrity, while the second guide shaft incorporates swingable support and movable support parts that enable dynamic adjustment of optical axis inclination in the orthogonal direction, combining both stability and adaptability.
Solution Approach 2:
The adjustability function is extracted from the guide shaft and transferred to the lens frame through the eccentric cam part. This allows the guide shaft to maintain its simple fixed structure for stability, while the lens frame independently provides the adjustment capability through the eccentric cam mechanism, resolving the contradiction between structural stability and adjustability.
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
This configuration allows precise adjustment of the optical axis inclination without altering the MR sensor and magnet gap, enhancing detection accuracy and simplifying assembly, particularly effective for horizontally long image pickup elements.
Implementation Method 1
an eccentric pin which is provided to the rotating member parallel to the optical axis and is provided eccentrically with respect to the rotating shaft
Implementation Method 2
a linear actuator which moves the lens frame
Implementation Method 3
An example of such a sensor is an MR sensor (magnetic resistance sensor)
Data Source
AI summary
A lens apparatus is capable of adjusting only the inclination of an optical axis in a desired direction. A focus lens frame is movably supported by a first guide shaft and a second guide shaft. The first guide shaft is provided in a lens barrel with both end parts of the first guide shaft being fixed. A front end part of the second guide shaft is swingably supported, a rear end part thereof is fitted into a horizontal elongate hole, and the second guide shaft is movably supported only in a horizontal direction. The second guide shaft is inserted through a first elongate hole formed in a swinging frame, and when the swinging frame is swung, the second guide shaft is horizontally swung. Then, when the second guide shaft is horizontally swung, the focus lens frame is horizontally swung, whereby the horizontal inclination of the optical axis is adjusted.