Slit-lamp Microscope Light Leakage Prevention via Controller
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Solution Overview
Problem
Conventional slit-lamp microscopes face issues with light leakage through gaps between slit blades, even when closed, due to manufacturing precision limitations, affecting the perceived quality of the instrument.
Innovation Solution
Incorporating a controller that turns off the light source when the slit blades are closed, ensuring no light escapes, regardless of manufacturing precision, and using a slit distance detector to confirm the blades are in contact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the pair of slit blades are in contact with each other to block light, then light blocking function is improved, but a gap may still be formed due to manufacturing precision limitations causing light leakage
Solution Approach 1:
The patent replaces the mechanical approach of achieving light blocking through precise physical contact of slit blades with an automated control system. The controller detects when slit blades are closed and automatically turns off the light source, substituting mechanical precision requirements with electronic control and detection mechanisms.
Solution Approach 2:
The patent implements a feedback control mechanism where the controller monitors the state of the slit blades and adjusts the light source accordingly. When the detector determines the slit blades are closed, the controller receives this feedback and turns off the light source, creating a closed-loop control system that ensures complete light blocking without requiring high manufacturing precision.
2Object-affected harmful factors
If high precision manufacturing is used to eliminate gaps between slit blades, then light leakage is prevented, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent eliminates the need for high-precision mechanical manufacturing by replacing it with an automated optical control system. Instead of relying on precisely manufactured slit blades that make perfect contact, the system uses a controller and light source to achieve complete light blocking through electronic control, thereby reducing manufacturing complexity and cost while preventing light leakage.
Solution Approach 2:
The patent extracts the light blocking function from the mechanical slit blade contact mechanism and transfers it to the light source control system. By separating the light generation function from the light blocking function, the system can achieve complete light blocking by simply turning off the light source rather than relying on mechanical precision.
3Use of energy by moving object
If the light source remains on when slit blades are closed, then energy consumption is reduced, but light leakage through gaps is perceived as low quality
Solution Approach 1:
The patent uses feedback control to determine when to turn off the light source based on the actual state of the slit blades. The controller receives detection signals about the slit blade position and only turns off the light source when the blades are confirmed to be closed, avoiding unnecessary energy consumption while preventing light leakage perception.
Solution Approach 2:
The patent implements preliminary detection of the slit blade state before controlling the light source. The detector预先 determines whether the slit blades are closed, and only then does the controller turn off the light source, ensuring that energy is not wasted when the slit is actually open and light leakage would occur.
Data Source
AI summary
A slit-lamp microscope includes an illumination system that is configured to project a slit light onto a subject eye; a slit portion that is configured to generate the slit light having a width by passing a light from a light source through a slit between a pair of slit blades in the illumination system; and a controller that is configured to control the light source, wherein the controller is configured to turn the light source off when the pair of slit blades is closed.