| US 7,573,977 B2 | ||
| Mammographic apparatus | ||
| Kazuhiko Tsujita, Otawara (Japan); and Shingo Kanemitsu, Nasushiobara (Japan) | ||
| Assigned to Kabushiki Kaisha Toshiba, Tokyo (Japan); and Toshiba Medical Systems Corporation, Otawara-shi (Japan) | ||
| Filed on Jan. 30, 2007, as Appl. No. 11/668,693. | ||
| Claims priority of application No. 2006-023845 (JP), filed on Jan. 31, 2006. | ||
| Prior Publication US 2007/0183566 A1, Aug. 09, 2007 | ||
| Int. Cl. H05G 1/02 (2006.01) | ||
| U.S. Cl. 378—37 [378/197] | 6 Claims |
| 1. A mammographic for taking an image of a breast of a subject, comprising:
an X-ray tube for radiating X-rays;
an X-ray detector for detecting the X-rays radiated from the X-ray tube and transmitted through the breast;
a column;
a first support frame arranged, for rotation about a rotary axis, on the column and supporting the X-ray tube;
a second support frame arranged, for rotation about the rotary axis, on the column and supporting the X-ray detector; and
a mechanism for selectively switching over between a first mode that the second support frame is rotated by a rotation force
of the first support frame and a second mode that the first support frame is rotated independently of the second support frame,
wherein the mechanism further includes a first motor for rotating the second support frame, a first gear in an arcuate form
fixed on the second support frame, a second gear rotatably provided in the first support frame and placed in mesh with the
first gear, and a second motor for rotating the second gear.
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