Patent Number: 
Section: claims

1. An X-ray computed tomography apparatus comprising: an X-ray tube configured to irradiate an object with X-rays;  a detector configured to detect X-rays transmitted through the object;  a noncontact type signal transmission device configured to transmit a signal output from said detector;  a first unit configured to generate image data based on the signal transmitted through said noncontact type signal transmission device; and  a second unit configured to display the image data,  wherein said noncontact type signal transmission device comprises:  a stationary portion;  a rotating ring disposed inside said stationary portion;  a plurality of light-emitting devices discretely arranged on an outer surface of said rotating ring;  a plurality of light-receiving devices discretely arranged on an inner surface of said stationary portion; and  a plurality of beam condensing devices configured to condense light from said plurality of light-emitting devices and arranged between said plurality of light-emitting devices and said plurality of light-receiving devices, said light striking a light-receiving device within a width substantially larger than a width of an effective light-receiving surface of said light-receiving device. 2. The apparatus according to  claim 1 , wherein said plurality of beam condensing devices are mounted on one of said stationary portion and said rotating ring or said plurality of light-receiving devices. claim 1 3. The apparatus according to  claim 1 , wherein said plurality of beam condensing devices are mounted on one of said stationary portion and said rotating ring or said plurality of light-receiving devices. claim 1 4. The apparatus according to  claim 1 , wherein said plurality of beam condensing devices are disposed at a position closer to said plurality of light-emitting devices than to said plurality of light-receiving devices. claim 1 5. The apparatus according to  claim 1 , wherein said plurality of light-receiving devices are disposed at a position closer to said plurality of beam condensing devices than a position to which the light is made to converge by said plurality of beam condensing devices. claim 1 6. The apparatus according to  claim 1 , wherein said plurality of light-receiving devices are disposed at a position farther from said plurality of beam condensing devices than a position to which the light is made to converge by said plurality of beam condensing devices. claim 1 7. The apparatus according to  claim 1 , wherein each of said plurality of beam condensing devices is a cylindrical lens, Fresnel lens, or curved mirror. claim 1 8. The apparatus according to  claim 1 , wherein said plurality of beam condensing devices do not have a function of condensing light from said plurality of light-emitting devices in a direction substantially parallel to an orbit of said rotating ring. claim 1 9. The apparatus according to  claim 1 , wherein said plurality of beam condensing devices have a function of diffusing light from said plurality of light-emitting devices in a direction substantially parallel to an orbit of said rotating ring. claim 1 10. The apparatus according to  claim 1 , further comprising: claim 1 a unit configured to code a transmission signal; and  a driving unit configured to drive said plurality of light-emitting devices in accordance with the coded transmission signal to turn on/off said plurality of light-emitting devices in accordance with the coded transmission signal. 11. The apparatus according to  claim 1 , further comprising: claim 1 a third unit configured to code a transmission signal,  a distributor configured to distribute the coded transmission signal to obtain a plurality of transmission signals, and  a plurality of driving units configured to drive said plurality of light-emitting devices in accordance with the plurality of transmission signals. 12. The apparatus according to  claim 1 , wherein said plurality of beam condensing devices have a function of condensing light said light-emitting device in a direction substantially parallel to a rotation axis of said rotating ring. claim 1 13. An X-ray computed tomography apparatus comprising: an X-ray tube configured to irradiate an object with X-rays;  a detector configured to detect X-rays transmitted through the object;  a noncontact type signal transmission device configured to transmit a signal output from said detector;  a unit configured to display image data,  wherein said noncontact type signal transmission device comprises:  a stationary portion;  a rotating ring disposed inside said stationary portion;  a plurality of light-emitting devices discretely arranged on an outer surface of said rotating ring;  a plurality of light-receiving devices discretely arranged on an inner surface of said stationary portion; and  a plurality of beam condensing devices located to focus a light from a light-emitting device onto a position between a corresponding beam condensing device and a corresponding light receiving device. 14. An X-ray computed tomography apparatus comprising: an X-ray tube configured to irradiate an object with X-rays;  a detector configured to detect X-rays transmitted through the object;  a noncontact type signal transmission device configured to transmit a signal output from said detector;  a first unit configured to generate image data based on the signal transmitted through said noncontact type signal transmission device; and  a second unit configured to display the image data,  wherein said noncontact type signal transmission device comprises:  a stationary portion;  a rotating ring disposed inside said stationary portion;  a plurality of light-emitting devices discretely arranged on an outer surface of said rotating ring;  a plurality of light-receiving devices discretely arranged on an inner surface of said stationary portion; and  a plurality of beam condensing devices located to focus a light from a light-emitting device onto a position which is located further than a corresponding light-receiving device with respect to a corresponding beam condensing device.