Camera Drive Device With Magnetic Pivot Support
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Solution Overview
Problem
Conventional camera driving apparatuses face challenges in compensating for large camera-shake angles and frequencies, particularly when photographers are walking, due to structural limitations, such as deformation of elastic supports, increased frictional loads, and mechanical looseness, which hinder accurate control and lead to phase and gain characteristic declines.
Innovation Solution
A camera driving apparatus with a pivot supporting structure featuring a conical contact face and a magnetic member, allowing for free rotation around a sphere center, along with a spirally wound wiring system for stress reduction and a fall preventive mechanism, enabling smooth three-axis motion control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If elastic bodies are used to support the lens barrel for small angle inclination, then the structure is simple and compact, but the elastic bodies deform plastically at large angles exceeding ±10 degrees, causing excessive load and increased Q factor that degrade phase and gain characteristics
Solution Approach 1:
The patent replaces the elastic body mechanical support system with a magnetic field-based support system. The magnetic field provides the necessary support force without physical contact, eliminating plastic deformation and Q factor issues that occur with elastic bodies at large angles. This substitution allows reliable compensation control even at inclination angles exceeding ±10 degrees.
Solution Approach 2:
The patent changes the fundamental parameter of support mechanism from elastic mechanical contact to magnetic field interaction. This parameter change enables the support system to maintain constant properties across the full range of motion, preventing the degradation of phase and gain characteristics that occurs with elastic body deformation.
2Productivity
If a reflective mirror is used for shake compensation, then compensation can be achieved, but the mirror becomes large with wide-angle lens systems and cannot be supported reliably by magnetic pivot structures against external disturbances
Solution Approach 1:
The patent extracts the reflective mirror from the optical system and replaces it with a lens-based imaging system. This eliminates the need for a large mirror in wide-angle systems and removes the vulnerability associated with magnetically supported mirrors against external disturbances like vibration and impact.
Solution Approach 2:
The patent uses a lens to create an optical copy of the scene rather than reflecting it with a mirror. This approach achieves the same compensation function without requiring a large mirror surface, making the system more suitable for compact wide-angle camera designs.
3Volume of moving object
If conventional pivot structures with magnetic attracting force are used to support the mirror, then the structure is compact, but the mirror may fall due to external disturbances such as vibration or impact
Solution Approach 1:
The patent replaces the magnetic pivot mechanical support structure with a magnetic field-based support system that uses magnetic attracting force between the attracting magnet and the magnetic member. This substitution provides more reliable support against external disturbances while maintaining a compact form factor.
Solution Approach 2:
The patent employs a composite support mechanism combining magnetic field interaction with a conical contact face and protrusion section. This composite approach provides both compact dimensions and enhanced stability, preventing the support structure from failing under external disturbances like vibration or impact.
4Adaptability or versatility
If spherical lens barrel support is used for large angle inclination, then the lens holder can be inclined at large angles, but the large rotating radius creates large frictional load and long moving distance, making accurate control difficult
Solution Approach 1:
The patent replaces the spherical mechanical contact support system with a magnetic field-based support system. This substitution eliminates the frictional load and long moving distance problems associated with large rotating radii, enabling accurate control even at large inclination angles.
Solution Approach 2:
The patent uses a conical contact face with a protrusion section having a spherical surface, creating a optimized curved geometry that reduces the effective rotating radius compared to a full spherical support. This geometric optimization minimizes frictional load and moving distance while maintaining large angle inclination capability.
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 apparatus achieves compact and durable camera control with improved phase and gain characteristics, enabling effective shake compensation in a wide frequency band, even at large angles, while maintaining a compact size and reducing power consumption.
Implementation Method 1
a movable unit for supporting the camera section, the movable unit including an attracting magnet for generating a magnetic attracting force for the magnetic member
Data Source
AI summary
A camera driving apparatus according to the present invention includes a camera section 100; a fixed unit including a protrusion section 202 at least partially formed of a magnetic member and has a shape of at least a part of a spherical face; a movable unit, the movable unit including an attracting magnet 404 for generating a magnetic attracting force, and a conical contact face with which the protrusion section of the fixed unit is loosely engageable and contactable by the magnetic attracting force, the movable unit being freely pivotable with respect to a sphere center of the spherical face of the protrusion section; a panning driving section; a tilting driving section; a rolling driving section; a detector; and a line 310′ spirally wound around the protrusion section 202 for connecting the camera section and an external circuit provided on the fixed unit to each other.