JPH03191948A - Panoramic x-ray photographing apparatus - Google Patents

Abstract

PURPOSE:To perform sharper X-ray photographing by moving an X-ray generator and a film cassette holder so as not only to accurately detect the position of the dental root part of a person to be photographed but also to parallely move both of them forwardly and rearwardly according to an oval track corresponding to each pattern of the shape of the dental arch of the person to be photographed and the position of the dental root where the oval track is detected. CONSTITUTION:Two motors 13, 16 are composed of stepping motors and can be freely set in rotary angular velocity or rotational speed and an X-ray generator 22 and a cassette holder 23 can be moved on the oval track similar to the dental arch of a patient to be photographed. Further, the light track 54 drawn by the beam projected from a beam generator 34 is allowed to be incident to the macrodont 53 where the dental roots of the anterior teeth of the person to be photographed are positioned to detect the positions of the dental roots of the anterior teeth and the oval tracks drawn by the X-ray detector 22 and the cassette holder 23 can be moved parallelly in forward and rearward directions and the X-ray photograph wherein a tomographic region is matched with each dental root part of the dental arch of the person to be photographed is always obtained.

Description

Detailed Description of the Invention [Industrial Application Field] The present invention provides a panoramic
This invention relates to a radiography device.

[Prior art and its problems] Panoramic X-ray imaging for dental treatment involves moving an arm having an X-ray generator and a film cassette holder at opposite ends in the front-rear direction while rotating horizontally. and the film cassette holder are moved along an elliptical trajectory that is as similar as possible to the semi-elliptical tooth row, thereby bringing the teeth in each region into focus.

For this purpose, a planetary gear mechanism is used, or a cam mechanism or a link mechanism is used to move the X-ray generator and film cassette holder on an elliptical orbit, but in both cases the structure is complicated. Moreover, the elliptical trajectory is constant, and changing it requires changing gears, cams, or link mechanisms, and these changes are virtually impossible in a dental clinic.

Claims (1)

[Scope of Claims] (a) A slider provided in a head case having a hole in the bottom plate so as to be movable in the front-rear direction; (b) A slider mounted on the lower part of the slider so as to be horizontally rotatable around a vertical axis; is equipped with an X-ray generator, a cassette holder at the other end into which a film cassette for receiving X-rays is loaded, and an arm that is horizontally rotated by a turning stepping motor attached to the slider; (c) the slider; A nut fixed to the head case is screwed into a forward and backward feed screw driven by a forward and backward stepping motor fixed in the head case, so that the slider can be moved forward and backward by the forward and reverse rotation of the stepping motor. (d) Also, a light beam generator is provided on a chin rest table provided horizontally to the head case support;
(e) A panorama characterized by comprising: a horizontal movement device that moves the light beam generator in the front-back direction; and a movement amount detection device that detects the amount of movement of the light beam generator in conjunction with the horizontal movement device. X-ray photography equipment.