Thermal Ring Focusing Structure for Long-Focal-Length Cameras
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Solution Overview
Problem
Existing temperature-based focusing methods for long-focal-length cameras require large supporting structures and high-power temperature control, limiting their focusing range and efficiency.
Innovation Solution
A structure comprising a thermal ring, thermal insulation pad, and secondary lens mount outer frame, where the thermal ring expands or contracts radially to adjust the position of the secondary lens piece, using a low-power temperature control device, with secondary lens mount spokes amplifying the movement for a wider focusing range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a large supporting structure is used for temperature-based focusing, then the focusing precision is improved, but the volume of the device increases and the temperature control power becomes larger
Solution Approach 1:
The patent applies thermal expansion by using a thermal ring made of materials with large temperature coefficients (such as invar or phosphor bronze). When the temperature of the thermal ring is controlled, it expands or contracts radially, which drives the secondary lens mount outer frame to move axially, thereby adjusting the position of the secondary lens piece and achieving focusing without requiring a large supporting structure
Solution Approach 2:
The patent changes the physical parameters of the thermal ring by controlling its temperature. The temperature control device adjusts the temperature of the thermal ring within a certain range, causing the thermal ring to expand or contract, which in turn changes the axial position of the secondary lens mount outer frame and achieves focusing with a compact structure
2Measurement precision
If a large supporting structure is used for temperature-based focusing, then the focusing precision is improved, but the temperature control power becomes larger
Solution Approach 1:
The patent uses the thermal expansion of a compact thermal ring to achieve focusing. The thermal ring has a small volume and high thermal efficiency, allowing the temperature control device to quickly and uniformly change its temperature with minimal power consumption. The thermal expansion of the small thermal ring produces sufficient radial displacement to drive the lens positioning mechanism
Solution Approach 2:
The patent achieves focusing by changing the temperature parameter of the thermal ring within a controlled range. The temperature control device adjusts the temperature of the thermal ring, causing it to expand or contract radially. This parameter change approach allows precise control with low power consumption while maintaining focusing precision
3Adaptability or versatility
If the focusing range is increased, then the adaptability is improved, but the device complexity increases
Solution Approach 1:
The patent converts radial thermal expansion into axial lens displacement through the geometric configuration of the secondary lens mount outer frame. When the thermal ring expands or contracts radially, the secondary lens mount outer frame is driven to move axially along the optical axis, thereby changing the position of the secondary lens piece. This dimensional transformation achieves a wide focusing range without increasing structural complexity
Solution Approach 2:
The patent uses thermal expansion of the thermal ring to drive the lens positioning mechanism. The simple structure consisting of the thermal ring, secondary lens mount outer frame, and lens pieces achieves wide focusing range through thermal-driven radial and axial motion conversion, avoiding complex mechanical focusing mechanisms
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 provides a compact, efficient, and stable temperature-based focusing mechanism with a wider focusing range, utilizing minimal power and maintaining device stability over time.
Implementation Method 1
the other end of the secondary lens mount outer frame is driven to radially expand or contract by thermal expansion and contraction of the thermal ring along the radial direction
Data Source
AI summary
A structure for temperature-based focusing of a long-focal-length camera includes a thermal ring, a thermal insulation pad, a secondary lens mount outer frame, and a primary lens support. An outer side face of the thermal ring is provided with a temperature control device and a temperature measuring device. The other end of the secondary lens mount outer frame is driven to expand or contract by thermal expansion and contraction of the thermal ring along the radial direction. A secondary lens piece is arranged at the central axis of one end of the secondary lens mount outer frame far away from the thermal insulation pad. A plurality of secondary lens mount spokes are uniformly arranged on the secondary lens piece along the circumferential direction; one end of the primary lens support far away from the secondary lens mount outer frame is provided with a primary lens piece.