| 摘要 |
The specification relates to an apparatus intended for panoramic X-ray photography of the area of the dentition and the jaws, the apparatus comprising a frame (1), a bearing part (2) which is linearly movable in relation to the frame part, and a support arm (10) which has been attached by means of bearings rotatably to the bearing part and which has at one end an X-ray film (11) and at the opposite end a source of X-radiation (12). The movements of the bearing part (2), the support arm (10) and the film (11) are mutually synchronized in such a way that an image of an area of the desired shape, for example an area the shape of the patient's dental arch, is obtained on the film during the movement. It is the object of the invention to provide the effect that the X-ray beam can be tilted to the desired angle in relation to the horizontal plane, whereby it is possible with greater sharpness than previously to photograph, for example, teeth slanted in relation to the vertical plane. In accordance with the invention, the support arm (10) is attached with bearings to the bearing part (2) so as to be tiltable about an axis perpendicular to the rotational axis of the support arm so that, when the rotational axis is vertical the straight line connecting the source of radiation (12) and the film (11) is oblique to the horizontal level. The structural parts (9, 16) between the bearing part (2) and the support arm (10) have curved guide means (13, 14) which work in conjunction with each other and the mutual |
