| 摘要 |
The present invention relates to a manual instrument with a tubular body (1) forming a grip handle, including a device for illuminating the working region (2a) of the tool (2), usable especially as a handpiece in dentistry. This instrument is characterised in that the illumination device comprises, between the point light source (4) and the working region (2a) of the tool (2), an optical coupler (7) also forming a light concentrator (focuser), this optical coupler being rotationally mounted about the axis (xy) of the body and having an upstream front face (6) permeable to light emitted by this source. <IMAGE>
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