| 摘要 |
PCT No. PCT/SE82/00337 Sec. 371 Date Jun. 15, 1983 Sec. 102(e) Date Jun. 15, 1983 PCT Filed Oct. 18, 1982 PCT Pub. No. WO83/01372 PCT Pub. Date Apr. 28, 1983.Optical-fiber lighting unit, preferably intended for dental work, and comprising a casing (1) wherein there is provided an optical system (12) to which a plurality of optical-fiber conductors (27) are optically connectable via a light switch (26). The light switch (26) comprises an optical device, for example a lens (28), for focusing incident light, and is displaceable along a plane coinciding with an imaginary plane extending through the center axis of the optical-fiber light conductors (27), transversely of the light path from the optical system (12), to a number of positions corresponding at least to the number of end portions of optical-fiber light conductors (27) connectable to the light switch (26), and that the light switch (26) is thereby adapted to focus the light from a light source (11) provided in the optical system (12) to the end portion of at least one optical-fiber light conductor (27).
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