| 摘要 |
A lamp primarily for use as a dental operating lamp which comprises an annular frame which is connected to an arm for mounting the lamp on a support, a light source and lens system mounted on the annular frame with the optical axis of the lens system generally aligned with the axis of the frame and a plurality of annular convection fins removably mounted on both sides of the frame in spaced relationship to one another so as to surround the light source and lens system while allowing an uninterrupted passage for convection currents in substantially all radial directions around the light source. The convection fins are preferably dished so as to form a shade for the light source without impeding the air flow and the lamp is preferably mounted on a support comprising a tubular arm which is adapted to form a continuous conduit for a flexible cable and which includes two joints along the lamp to be rotated through at least 330 DEG about each of two mutually perpendicular axes which axes are preferably both perpendicular to and pass through the optical axis of the lamp.
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