Aperture Adjusting Device Guiding Slot Relocation
Solution Overview
Problem
Conventional aperture adjusting devices face limitations in increasing the swingable range of the blade and the covering ratio of the aperture due to constraints on the length of the guiding slot and the rotational speed ratio, and they require high manufacturing precision and large torsional force for the gear ring, making it difficult to achieve fine control of incoming light and mass production.
Innovation Solution
An aperture adjusting device with a support frame and a gear ring that has a long guiding slot to enhance the swingable range of the blade, eliminating the need for a guiding slot on the gear ring, reducing its size and weight, and using a double-level gear to increase the rotation speed ratio, allowing for finer control of the covering ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the guiding slot length is increased to enlarge the blade swingable range and improve covering ratio, then the covering ratio is improved, but the gear ring area becomes insufficient due to space constraints for teeth and suspension shafts
Solution Approach 1:
The guiding slot is relocated from the gear ring to the support frame, changing the spatial dimension and structural arrangement. This allows the guiding slot to extend along the radial direction of the support frame without consuming gear ring area, enabling a longer guiding slot (L1 ≥ 10mm) that provides sufficient blade swingable range while maintaining adequate space on the gear ring for teeth and suspension shafts.
2Measurement precision
If the rotational speed ratio of driving gear to gear ring is increased to reduce adjusting increment and achieve fine control, then the control precision is improved, but the number of teeth on driving gear becomes insufficient
Solution Approach 1:
The rotational speed ratio between the driving gear and gear ring is optimized to a range of 1:5 to 1:10. This parameter adjustment achieves fine control precision with an adjusting increment of 0.5° to 2.0° per step motor rotation step, while maintaining a reasonable number of teeth (20-40 teeth) on the driving gear that can be manufactured with standard precision.
3Ease of operation
If hanging shafts are used to suspend the gear ring from the cover plate, then the gear ring can rotate, but the manufacturing precision requirement increases and frictional force increases requiring large torsional force
Solution Approach 1:
The hanging shafts are removed from the support frame structure. Instead of suspending the gear ring from the cover plate via hanging shafts, the gear ring is directly rotatably disposed on the support frame. This eliminates the hanging shafts and their associated high manufacturing precision requirements and frictional forces, simplifying the structure and reducing the torsional force needed for rotation.
4Ease of manufacture
If the gear ring size is reduced to simplify manufacturing and reduce weight, then the manufacturing complexity is reduced, but the guiding slot length becomes insufficient
Solution Approach 1:
The guiding slot is relocated from the gear ring to the support frame, fundamentally changing the structural arrangement. This allows the gear ring to be compact in size for easy manufacturing and reduced weight, while the guiding slot extends along the radial direction of the support frame to achieve sufficient length (L1 ≥ 10mm) for adequate blade swingable range.
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 increases the covering ratio of the aperture, reduces the required torsional force, and facilitates fine control of light transmission by enlarging the rotary and swingable ranges of the gear ring and blades, while simplifying manufacturing and reducing production costs.
Implementation Method 1
a step motor (151), and a driving gear (152). The motor (151) connects with the driving gear (152) to drive the driving gear (152) to rotate
Implementation Method 2
The gear ring (12) has a plurality of teeth (121) that are engaged with the driving gear (152) of the driving module (15)
Data Source
AI summary
An aperture adjusting device is disclosed. The aperture adjusting device includes a support frame, a gear ring, at least one blade, and a connector. The support frame includes an aperture, and a guiding slot. The gear ring is rotatably disposed on a first side of the support frame. The blade is swingably disposed on a second side of the support frame, and used to partially cover the aperture. The connector is fixed to the gear ring, and passes through the guiding slot to connect with the blade. The gear ring is adapted to rotate to make the connector move along the guiding slot to drive the blade to swing.