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Abstract

Apparatus for producing panoramic x-ray image projections of the dental arch on X-ray film. The apparatus includes a fixed body (1). The opposite ends of a movable supporting arm (11) are fitted with an X-ray source (12) and a film holder (13) that may be positioned on opposite sides of the dental arch. A first drive (20-23) produces a rotating motion of supporting arm (11) with respect to the arch. A second drive (2, 4) sets the center of rotating motion in linear movement in dependence on the angular position of supporting arm (11). The apparatus further includes a selector (3, 6, 10) for selecting the direction of linear motion (translatory motion) as desired. The selector includes a rotary plate (3), journalled (9) to the body (1) and to which is journalled (8) a linear plate (2) facilitating the linear motion; a motor (10), which is mounted on the rotary plate (3) and which, by means of its associated pinion and a tooth rim ( 6) provided on body (1), translates the rotary plate (3) to a desired angular position; and a sensor (19) for the determination of a desired angular position.

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First Claim