Electronic Endoscope Light Source Rotary Shutter Gear Mechanism

The rotary shutter is divided into multiple aperture-controlling rotary plates (typically three plates) that can rotate independently or together. Each plate has light intercepting portions and opening portions arranged alternately. By segmenting the shutter into multiple plates with different rotational positions, the patent achieves variable aperture control without requiring a complex variable distance mechanism, thus resolving the contradiction between light modulation capability and structural complexity.

The patent combines multiple aperture-controlling rotary plates into a single rotary shutter assembly that rotates together as one unit. This merging approach allows the multiple plates to work in coordination to control light transmission, achieving effective light modulation while simplifying the overall structure compared to using separate mechanisms for each plate.

The patent employs asymmetrical light intercepting portions on the rotary plates to achieve variable aperture control. The plates have different patterns of openings and intercepting portions that create asymmetric shapes, allowing precise control of light transmission area.

The patent addresses the balance issue by carefully designing the distribution of material on the rotary plates. Even though the light intercepting portions create asymmetry for aperture control, the overall plate design maintains rotational balance by distributing mass appropriately, preventing the center of gravity from deviating from the rotation axis and eliminating flickering caused by unbalanced rotation.

The patent uses periodic rotation of the aperture-controlling rotary plates to achieve shutter function. The plates rotate at controlled speeds to periodically open and close the aperture, enabling high shutter speeds. The multi-plate design with alternating opening and intercepting portions ensures smooth periodic light transmission.

By maintaining rotational balance through proper mass distribution on the rotary plates, the patent eliminates unbalanced forces that would cause flickering during high-speed rotation. This allows the system to achieve high shutter speeds while maintaining stable brightness output.

The patent introduces a magnetic coupling mechanism as an intermediary between the motors and the rotary plates. Instead of directly connecting motors to plates with harnesses that would interfere during rotation, the magnetic coupling transmits rotational force wirelessly through magnetic fields, eliminating harness interference while maintaining independent control capability.

The patent replaces the direct mechanical connection (motors connected via harnesses to rotary plates) with a magnetic field-based transmission system. This substitution eliminates the need for physical harnesses that would interfere during rotation, while still allowing independent control of the rotary plates through magnetic coupling.