| 摘要 |
1,253,718. Dental handpieces. RADIOPTICS Inc. 20 March, 1969 [27 March, 1968], No. 14795/69. Heading A5R. [Also in Divisions F4 and G2] An illuminator apparatus for directing light on to an area to be worked comprises optical fibres 51, Fig. 9, connected at one end to a light source and at the other to an annular support surrounding the working portion 17, Fig. 1, of a tool 11, for example a dentist's drill. The support comprises concentric rings 53 and 54 between which the fibres are evenly distributed; the rings and fibres may be arranged such that the fibres are parallel (Fig. 4, not shown), converging (Fig. 5, not shown) or diverging, and may consist of one or more layers so that at a given working distance and annular radius the area is evenly illuminated; a diffuser (55) (Fig. 4, not shown) may be used to this end. Fibres 51 from the annulus are cemented over an inner form 73 and an outer form 75 cemented over that to form an illuminator head 19; the form 75 may have a clip 21 to attach it to the head 15 of the tool 11. The fibres may be divided into bundles 22 with protective sleeves 71 which may be united in a transmission section 23 to form a guide 27 connected to a coupler 29 and a further light guide 31 connects the coupler to the light source comprising a lamp 37, cooled by a fan 43 and louvres 45 in the housing 33, an infra red filter 41, condensing lens 39 and light intensity control 47. The fibre annulus is constructed by cementing the fibres at one end and placing the open ends over the tip (63) (Fig. 7, not shown) of a madrel (61) and cementing these to the inner ring 54 mounted on the madrel, the outer ring 53 is then cemented in place, the fibres being cut and ground after assembly on to the tool. |
