| 摘要 |
<p>A shutter mechanism having a slide element coupled to a support base by a plurality of roller bearings journaled between opposing pairs of guide rods is disclosed. The slide element and support base have corresponding beam apertures in alig nment when the shutter is in its open position. Angularly mounted on the slide, ad jacent to the slide's beam aperture, is a UV reflective mirror. when the shutter is co mmended to close, an actuator forces the slide and support base apertures out of ali gnment, while simultaneously positioning the UV reflective mirror into the position previo uslyoccupied by the slide's aperture. A laser beam, prev iously being transmitted through the aligned apertures, will be reflected by the mirror to a beam stop as a d iagnostic instrument mounted on the support base.</p> |
