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What is the working principle of the manual x ray collimator?

The manual x ray collimator is a beam limiter that is manually adjusted. The operation of the manual x ray collimator is simple and convenient.
The opening and closing process of the occlusion lead leaf of the manual x ray collimator is realized by manually adjusting the knob on the limiter.
The manual x ray collimator uses the focus of the indicator bulb to simulate the Xray tube, replaces the Xray with visible light, and illuminates the bed surface through the reflection of the mirror in the beam limiter.
Are there two types of lamps in the x ray collimator halogen and LED
The optical path after the visible light path and the Xray penetrating the mirror is Consistent, so it can indicate the size of the field in advance. Since the life of the indicator light is relatively short, the illumination of the indicator light is controlled by a button to turn on the light. The mirrors are typically made of silver-plated plastic with an aluminum equivalent of about 0.5 mm and do not affect Xray imaging. There is also a clean, transparent plastic plate in front of the x ray collimator with black lines or black dots on the plate to indicate the center of the beam.
The x ray collimator is marked with the corresponding focal length of the illumination field around the knob, which is mainly used for presetting the illumination field before the illumination of the field indicator light, so that the illumination field can be adjusted quickly after the indicator light is turned on. The size of the indicator extends the life of the indicator.