Dental panoramic radiographic apparatus capable of concurrently taking normal picture of temporomandibular joint

Claim 2

A dental panormaic radiographic apparatus capable of concurrently taking an X-ray picture of a tooth and jaw region and of a temporomandibular joint of a patient comprising a rotatable arm, an X-ray source provided on one end of said arm, an X-ray film provided on another end of said arm opposing said X-ray source and moving in synchronism about a patient's head with said X-ray source when said arm rotates with a constant distance being maintained between said X-ray source and film, said apparatus being characterized in that said apparatus comprises a means for fixing and holding a head of a patient in a position for photographing said tooth and jaw regions and a position above or below the position for photographing said tooth and jaw regions for photographing said temporomandibular joint and a means for starting and stopping the irradiation of an X-ray beam from said X-ray source in any of a plurality of positions as said arm rotates, said starting and stopping means comprising a means for sensing rotational position of said arm which generates a voltage which varies with the rotational position of said arm and a switching element which interrupts and connects a power source to said X-ray source in response to said varied voltage.

Claim 3

A device according to claim 1, further comprising a means for adjusting the height of said X-ray beam.

Claim 4

A dental panoramic radiographic apparatus capable of concurrently taking an X-ray picture of tooth and jaw regions and of a temporomandibular joint of a patient comprising a rotatable arm, an X-ray source provided on one end of said arm, an X-ray film provided on another end of said arm opposing said X-ray source and moving in synchronism about a patient's head with said X-ray source when said arm rotates with a constant distance being maintained between said X-ray source and film, said apparatus being characterized in that said apparatus comprises: a means for adjusting the longitudinal length of said X-ray beam; a means for fixing and holding the head of a patient in a position for photographing said tooth and jaw regions and a position above or below the position for photographing the tooth and jaw regions, said means for fixing and holding comprising height adjusting means capable of making a pair of ear rods correspond to the ear holes of a patient when the rods are above or below the posture of the patient, placing his chin on a chin rest, said rods being a pair of right and left ear rods suspended from a body; and a means for starting and stopping the irradiation of an X-ray beam at any position of a predetermined plane section of an object, said starting and stopping means comprising a potential divider, said divider moving in a coaxially relation with a shaft of a film holder to correspond to the position of the movement thereof, a detection member for operating a first switching element in a specified voltage range of divided potential of said potential divider, and a second switching element for closing and opening a power circuit for said X-ray source in response to said first switching element.

Claim 5

A dental panoramic radiographic apparatus capable of concurrently taking an X-ray picture of tooth and jaw regions and of a temporomandibular joint of a patient comprising a rotatable arm, an X-ray source provided on one end of said arm, an X-ray film provided on another end of said arm opposing said X-ray source and moving in synchronism about a patient's head with said X-ray source when said arm rotates with a constant distance being maintained between said X-ray source and film, said apparatus being characterized in that said apparatus comprises: a means for adjusting the longitudinal length of said X-ray beam; a means for fixing and holding the head of a patient in a position for photographing said tooth and jaw regions and a position above or below the position for photographing the tooth and jaw regions, said means for fixing and holding comprising height adjusting means capable of making a pair of ear rods correspond to the ear holes of a patient when the rods are above or below the posture of the patient, placing his chin on a chin rest, said rods being a pair of right and left ear rods suspended from a body; and a means for starting and stopping the irradiation of an X-ray beam at any position of a predetermined plane section of an object, said starting and stopping means comprising a potential divider, said divider moving in a coaxially relation with a shaft of a film holder to correspond to the position of the movement thereof, a detection member for operating a first switching element in a specified voltage range of divided potential of said potential divider, and a second switching element for closing and opening a power circuit for said X-ray source in response to said first switching element.