JPH03170132A - Panoramic x-ray photographing device - Google Patents

Abstract

PURPOSE:To execute focused distinct X-ray photographing by rotating an arm and moving it forward backward, and moving an X-ray generator and a film cassette holder of both ends by an elliptical track corresponding to a tooth train shape. CONSTITUTION:When a motor 16 is rotated forward, a screw shaft 18 connected and engaged by a timing belt 21, etc., rotates forward, a nut 2e screwed to the screw shaft 18 advances and moves in the left direction, and the whole slider 2 for fixing the nut 2e is guided by guide shafts 3, 4 and advances in the left direction. When the motor 16 is rotated backward, the slider 2 slides in the right direction. When a motor 13 for rotation is rotated forward, a cylindrical gear 9 rotates forward through a pulley 14 and a timing belt 15, and an arm attached to its lower part rotates forward. In such a state, as for the motors 13, 16, a stepping motor is used, a rotational angular velocity of the motor 13 is set to a roughly equal speed so as to vary rotating speed of the motor 16 by drawing a half period of a cosine wave, and the rotating speed of both of them is controlled so that a movement of a cassette holder 23 draws a half ellipse being similar to a tooth train bow 24.

Description

[Detailed Description of the Invention] [Field of Application of K Industry] The present invention mainly applies to dentition and!
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Concerning a panoramic X-ray imaging device. [Prior art and its section B] @1.I Panoramic X-ray photography for medical treatment involves horizontally rotating an arm that holds an X-ray generator and a film force setter at the opposite end and moving it in the front-rear direction. x! J
The i-generator and the film force setter are moved in an elliptical orbit that is as similar as possible to the semi-elliptical tooth row, thereby focusing on the teeth in each region. For this purpose, an M-star gear mechanism is used, or a cam mechanism or a link mechanism is used to allow the film cassette holder to move the X-ray generator on an elliptical trajectory, but both have complicated structures. Not only that, but the elliptical orbit is constant, and to change it, the gears, cams, or link mechanisms must be changed, and these changes are not possible at mountain clinics.
This is practically impossible.

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) attached to the lower part of the slider so as to be horizontally rotatable around a vertical axis;
It has an X-ray generator at one end, a cassette holder for loading a film cassette for receiving X-rays at the other end, and an arm that is horizontally rotated by a turning stepping motor attached to a slider, (c) A nut fixed to the slider is screwed into a forward-reverse feed screw driven by a forward-reverse stepping motor fixed in the head case, so that the slider is moved forward and backward by forward and reverse rotation of the stepping motor. A panoramic X-ray imaging device.