Lens Apparatus Coil Placement for Noise Reduction
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Solution Overview
Problem
Existing zoom lenses face challenges in increasing aperture while minimizing aberration variation, which often requires heavier focusing units and can lead to increased outer diameter and noise issues due to improper placement of booster circuits in the lens apparatus.
Innovation Solution
A lens apparatus with an optical system comprising a first lens unit with positive refractive power, a second lens unit with negative refractive power, and a rear lens group, where the voltage transformation unit includes coils disposed strategically to avoid increasing the outer diameter and reduce noise, allowing for efficient focusing and zooming without significant aberration variation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the aperture of the zoom lens is increased, then the light gathering capability is improved, but large variation of aberration is easily produced during focusing
Solution Approach 1:
The patent employs a driving mechanism that dynamically adjusts the positions of multiple lens units (first lens unit, second lens unit, third lens unit, and fourth lens unit) during focusing operations. This dynamic coordination allows the optical system to maintain aberration correction even with increased aperture by compensating for aberration variations through synchronized movement of multiple lens groups.
Solution Approach 2:
The patent changes multiple parameters simultaneously during focusing, including the positions of different lens units and the driving forces applied to them. By coordinating these parameter changes, the system can increase aperture while maintaining aberration control through optimized optical path adjustments.
2Reliability
If the weight of the focusing unit is increased to suppress aberration variation, then the driving efficiency of the motor is improved, but the outer diameter of the lens apparatus may be increased
Solution Approach 1:
The patent divides the focusing system into multiple separate lens units (first, second, third, and fourth lens units), each with specific refractive powers and movement characteristics. This segmentation allows the system to achieve stable aberration control through coordinated movement of lighter individual units rather than requiring a single heavy focusing unit, thereby maintaining a compact outer diameter.
Solution Approach 2:
The patent creates a composite optical system where multiple lens units with different refractive powers (positive and negative) work together. This composite structure distributes the optical correction function across multiple components, allowing each unit to remain relatively lightweight while collectively achieving superior aberration control.
3Power
If the booster circuit is disposed at an improper position, then the voltage boosting function is achieved, but noise may be superimposed on the image signal due to magnetic field generated by the coil
Solution Approach 1:
The patent extracts the voltage transformation unit (including the coil that generates magnetic fields) from the optical system's light path and positions it in a location where it does not interfere with the optical components or image signal. This separation removes the source of magnetic interference from the sensitive optical region, eliminating noise in the image signal while preserving the voltage boosting function.
4Power
If the booster circuit is disposed at an improper position, then the voltage boosting function is achieved, but the outer diameter of the lens apparatus may be increased
Solution Approach 1:
The patent positions the voltage transformation unit in a different spatial dimension or location within the lens apparatus, specifically placing it where it does not contribute to the outer diameter of the optical system. This strategic placement allows the boosting circuit to be integrated without increasing the lens's external dimensions.
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 solution effectively manages aberration variation and noise, achieving high optical performance while maintaining a compact lens apparatus design, even with increased aperture, by strategically placing the voltage transformation unit's coils to minimize interference with the image signal and reduce the lens's outer diameter.
Implementation Method 1
The voltage transformation unit includes coils. The actuator is configured to be driven by a voltage output from the voltage transformation unit
Implementation Method 2
a first lens unit having positive refractive power, a second lens unit having negative refractive power, and a rear lens group having positive refractive power disposed in this order from object side to image side
Data Source
AI summary
The lens apparatus includes an optical system, a voltage transformation unit, and an actuator. A first lens unit of the optical system is moved toward the object side during zooming from a wide-angle end to a telephoto end. The voltage transformation unit includes coils. The actuator is configured to be driven by a voltage output from the voltage transformation unit and to move a part of the lens units in the optical system during focusing. The coil is disposed at a position that is separated from a position of a most object-side surface of the optical system at the wide-angle end, toward the image side by a maximum or more moving amount of the first lens unit, and is closer to the object side than a most image-side surface of the optical system at the wide-angle end.