As we all know, hospital operations are performed in the operating room. Shadowless lamps are necessary equipment in the operating room. As the name suggests, shadowless lamps combine good lighting effects. It can eliminate shadows as much as possible and minimize the errors that may be caused by surgery. It also helps a lot on surgical safety, quality, efficiency, ability to work continuously, and eye protection. Shadowless lights are used to illuminate the surgical site for better viewing of small, low-contrast objects, at various depths in incisions and body cavities.
And because the operator's head, hands and instruments will produce shadows on the surgical site, the shadowless lamps should be designed to minimize shadows and minimize color distortion as much as possible. In addition, shadowless lamps need to work continuously for long periods of time without releasing too much heat, because too much heat can be uncomfortable for the operator and dry out the tissue at the surgical site.
So why does the surgical shadowless lamp have no shadow? Let's take a look at how it works:
Because light travels in a straight line, when light hits an opaque object, shadows form behind the object. Different places, different times, the shadows are different. For example, the shadow of the same person in the sun will be shorter at noon than in the morning and evening. Shadows can be divided into surviving shadows and penumbras. The principles of these phenomena are all because light travels in straight lines.
Incandescent lamps are lit with curved spirals, not point sources. Light from this point will occlude the object, while light from other points will not necessarily completely occlude it. It can be seen that the larger the area of the luminous body, the smaller the umbra.
If we light a circle of lights around, the umbra disappears completely and the penumbra fades away. A surgical shadowless lamp is made according to the above principles.
This is a circular lamp with high-intensity light on the lamp panel, which can synthesize a large-area light source. In this way, light can be irradiated onto the operating table from different angles without producing an obvious umbra, so it is called a shadowless lamp.