| 摘要 |
<p>A combined reflector (16) and arc guide for use with a xenon flash tube (18) comprises a reflector structure (58) having a reflecting surface (62) that is adapted to be placed in a predetermined orientation with respect to the flash tube (18). An electrically conductive arc guide is carried by, and is preferably integral with, the reflector structure (58) for controlling the arc in the flash tube (18). The arc guide comprises an elongated ridge (64) that projects outwardly from the reflecting surface (62) of the reflector structure (58), and extends in a direction substantially parallel to the longitudinal axis of the flash tube (18). An electrical terminal is carried by the reflector structure (58) and has an electrical connection to the arc guide for allowing an electrical potential to be applied to the arc guide. The reflector structure (58) is preferably made of an electrically conductive plastic material, thereby providing continuity between the electrical terminal and the arc guide without the need for a separate conductor. An area of modified reflectivity, preferably in the form of a plurality of grooves (68), may be provided in the reflective surface (62) of the reflector structure (58) to spread out the intensity peak of the flash tube (18). The disclosed reflector (16) is simple and inexpensive to manufacture, and is suited for use in automated hematology systems in which a pulse of light from the flash tube (18) causes dyed blood cell layers in a capillary tube to fluoresce so that a complete blood count can be obtained by optical imaging techniques while the blood sample is being rotated in a centrifuge.</p> |
