Abstract: An aperture device defines X-ray beams emitted from X-ray focal points L and R spaced apart from each other along the first direction. This defining operation is performed along the first direction and a second direction crossing the first position, thereby shaping a rectangular X-ray radiation area. Blades defining the two edges of the X-ray beam along the first direction and blades defining two edges of the X-ray beam along the second direction are supported by engaging portions into which screw portions of screw rods are screwed and engaging portions slidably fitted around round portions of the screw rods, respectively. When the screw rods are rotated by activation of corresponding stepping motors, the corresponding engaging portions are moved parallel to the screw rods. The respective blades can be variably moved along the first or second direction, thereby forming an X-ray radiation area having any shape in any position.

Abstract: A stereoscopic projecting apparatus has a polyhedral prism and two types of polarizing filters which are arranged at the incident (or emerging) planes of the prism and which have orthogonal deflecting directions. Left and right-eye pictures are alternately formed on the consecutive frames of a cinefilm. The cinefilm is driven in such a way as to cross the projection region of light emitted from a lamp. An optical image transmitted from the cinefilm is projected onto a screen by the polyhedral prism, through a relay lens, a projection lens or the like. The left and right-eye images are deflected in directions 90.degree. apart from each other, by the polarizing filters at the respective incident or emerging planes of the prism. A viewer can stereoscopically observe the image superimposed on the screen, using polarized viewing glasses having polarized lenses deflected in the deflecting directions of the images.

Abstract: An X-ray stereoscopic cinematography apparatus including an X-ray tube having at least a pair of focal spots from which X-rays are irradiated independently at an object to produce an X-ray image of an object under study, means for converting the X-ray image to an optical image, an optical system device for distributing the optical image to first and second cinecameras. The optical system device includes a first half-mirror having a reflection rate of approximately fifty percent and a second half-mirror having a comparatively low transmission rate, the half-mirrors being separately positionable in a first position to reflect the optical image or a second position out of the light path of the optical image to distribute the optical image to the first and second cinecameras. A television camera is provided to accept the optical image delivered through the optical system device and to convert it to an electric signal.

Abstract: An X-ray stereoscopic cinematography apparatus including an X-ray tube having at least a pair of focal spots from which X-rays are irradiated independently at an object under study to produce an X-ray image thereof, an image intensifier for converting the X-ray image to a corresponding optical image, and an optical system device for selectively distributing the optical image to first and second cinecameras. The optical system device includes a first half-mirror having a reflection rate of approximately fifty percent, a second half-mirror having a comparatively low transmission rate and an entire reflection mirror, the half-mirrors and the entire reflection mirror being separately positionable in a first position to reflect the optical image or a second position out of the light path of the optical image to distribute the optical image to the first and second cinecameras.