| 摘要 |
A light protection apparatus receives a beam of light having both a harmless light component and a harmful light component. The apparatus includes a housing having a forward end and a rear viewing end. A view aperture is located near the viewing end and receives the beam of light. An objective lens passes light onto a reflective device within the housing. The reflective device reflects the beam of light onto a partially reflective surface. The partially reflective surface includes an absorbing portion and a reflective pellicle surface. The reflective pellicle surface reflects the harmless light component to an eye piece lens. The harmful component, however, destroys the pellicle surface and the harmful light is transmitted to the absorbing portion and thus no reflection occurs. A cartridge carries the pellicle surface and is threadably removable with respect to the housing for replacement of the cartridge. In addition, a laser detector detects the presence of laser light and signals the user accordingly.
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