Ophthalmologic Observation Apparatus with Polygon Mirror Error Compensation
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Solution Overview
Problem
Existing ophthalmologic observation apparatuses using confocal laser scanning microscopy systems face challenges in obtaining high-quality images due to manufacturing errors in the polygon mirror's reflection faces and angle discrepancies, which affect image quality.
Innovation Solution
The apparatus employs a laser source, a rotating polygon mirror, and a moving galvano mirror to scan a laser beam in orthogonal directions, with a photoreceptor element and image forming unit to create motion images. A light source and photo sensor detect switching of the polygon mirror's reflection faces, allowing the controller to adjust the galvano mirror and image forming unit to ensure each image line is formed based on signals from the same reflection face, even if the mirror's faces have errors. Filters are used to differentiate between the laser beam and detecting light, reducing noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a polygon mirror is used to scan the laser beam, then the scanning speed and productivity are improved, but manufacturing errors in the reflection faces and angle discrepancies occur, which worsen the image quality
Solution Approach 1:
The patent employs a feedback mechanism where the actual rotation angle of the polygon mirror is detected and used to dynamically adjust the galvano mirror's scanning angle. This closed-loop control compensates for manufacturing errors in the polygon mirror's reflection faces, ensuring that image lines are correctly formed despite variations in the polygon mirror's angular position, thereby maintaining image quality while preserving high scanning speed
Solution Approach 2:
The system dynamically changes the scanning parameters of the galvano mirror based on the detected rotation angle of the polygon mirror. By adjusting the galvano mirror's scanning angle in real-time according to the polygon mirror's actual position, the system compensates for manufacturing errors and maintains accurate image formation without sacrificing the high-speed scanning capability provided by the polygon mirror
2Device complexity
If the galvano mirror scanning angle is fixed, then the device complexity is reduced, but the image quality deteriorates due to polygon mirror manufacturing errors
Solution Approach 1:
The patent introduces a feedback control system where the rotation angle of the polygon mirror is continuously monitored and used to adjust the galvano mirror's scanning angle. This dynamic adjustment mechanism compensates for polygon mirror manufacturing errors, improving image quality while adding only minimal control complexity through the use of existing sensors and controllers already present in the system
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
This configuration enables the production of high-quality motion images of the eye's target site, even with errors in the polygon mirror's reflection faces, by ensuring each image line is formed based on consistent reflection faces, thereby reducing 'flowing noise' and improving image stability.
Implementation Method 1
a polygon mirror that rotates for a predetermined time at a predetermined speed, reflects the laser beam and scans in a first direction
Implementation Method 2
a galvano mirror that moves for a predetermined time at a predetermined speed, reflects the laser beam and scans in a second direction orthogonal to the first direction
Implementation Method 3
a photoreceptor element that receives the laser beam reflected at the target site
Implementation Method 4
a light source that emits to the polygon mirror, detecting light of a wavelength that is different from a wavelength of the laser beam
Implementation Method 5
a photo sensor that receives the detecting light reflected by the polygon mirror
Implementation Method 6
a photo sensor that receives the detecting light reflected by the polygon mirror
Implementation Method 7
a first filter disposed in front of the photoreceptor element and having a feature of transmitting the laser beam and interrupting the detecting light
Implementation Method 8
a second filter disposed in front of the photo sensor and having a feature of transmitting the detecting light and interrupting the laser beam
Data Source
AI summary
An ophthalmologic observation apparatus of a confocal laser scanning microscopy system for photographing and observing a target site of an eye of an examinee, includes a controller that, based on a number of image lines of one frame of a motion image to be displayed, a number of reflection faces of a polygon mirror, and a detection result of a photo sensor, controls a galvano mirror and an image forming unit so as to form each image line of each frame of the motion image based on the photo-receiving signals of a laser beam reflected on same reflection face of the polygon mirror.