Patent Number: 
Section: claims

1. A collimator unit in a radiation detecting system, the collimator unit comprising:a pair of holding members each comprising a plurality of grooves formed in respective mutually opposed surfaces;a plurality of collimator plates inserted respectively into the plurality of grooves formed in each of the pair of holding members; andan urging member disposed between the pair of holding members and comprising a plurality of engaging portions each adapted to engage a plate surface of each of the inserted collimator plates, the plurality of engaging portions each adapted to urge the plate surface toward a side wall of a corresponding groove of the plurality of grooves formed in each of the pair of holding members. 2. A collimator unit according to claim 1,wherein the plurality of engaging portions comprises a plurality of notched grooves that are formed in the urging member in a position substantially the same as position of the plurality of grooves in each of the pair of holding members, andwherein each of the plurality of collimator plates is held grippingly between a side wall of the corresponding groove of the plurality of grooves formed in each of the holding members and a side wall of a corresponding notched groove in the urging member. 3. A collimator unit according to claim 2, wherein the urging member is disposed in abutment against or in proximity to a surface defined by each of the plurality of grooves of each of the pair of holding members. 4. A collimator unit according to claim 2,wherein the urging member comprises a first plate-like member and a second plate-like member fixed to the first plate-like member, andwherein the plurality of notched grooves is formed in the second plate-like member. 5. A collimator unit according to claim 4, wherein the first plate-like member has rigidity and the second plate-like member has elasticity. 6. A collimator unit according to claim 5, wherein the first plate-like member contains as a principal component any of steel, stainless steel, and aluminum alloy, and has a predetermined thickness of not smaller than 0.5 millimeter and not larger than 3 millimeters. 7. A collimator unit according to claim 5, wherein the second plate-like member contains as a principal component any of steel, stainless steel, phosphor bronze, copper alloy, and plastic, and has a predetermined thickness of not smaller than 0.1 millimeter and not larger than 0.5 millimeter. 8. A collimator unit according to claim 1, wherein the side wall of each of the plurality of grooves in each of the pair of holding members to which the plurality of collimator plates are urged are formed in a direction in which the plurality of collimator plates are to be inserted. 9. A collimator unit according to claim 1, wherein the side wall of each of the plurality of grooves in each of the pair of holding members to which the plurality of collimator plates are urged are formed at a pitch at which the plurality of collimator plates are to be inserted. 10. A collimator unit according to claim 1, wherein each of the pair of holding members comprises a plurality of grooves formed in a notched manner along one edge of a plate-like member. 11. A collimator unit according to claim 1, wherein each of the pair of holding members comprises a plurality of grooves formed on a plate surface of a plate-like member. 12. A collimator unit according to claim 1, wherein the urging member is adapted to engage each of the pair of holding members through a rotating member comprising an eccentric structure. 13. A collimator unit according to claim 1, wherein the urging member is adapted to engage each of the pair of holding members through a rotating member comprising a cam structure. 14. A collimator unit according to claim 1, wherein each of the plurality of collimator plates contain molybdenum or tungsten as a principal component. 15. A collimator unit according to claim 1, wherein the urging member comprises a plurality of urging members, at least one of the plurality of urging members is disposed for each of the pair of holding members. 16. A radiation detecting device comprising:a detector unit; anda collimator unit coupled to the detector unit, the collimator unit comprising:a pair of holding members each comprising a plurality of grooves formed in respective mutually opposed surfaces;a plurality of collimator plates inserted respectively into the plurality of grooves formed in each of the pair of holding members; andan urging member disposed between the pair of holding members and comprising a plurality of engaging portions each adapted to engage a plate surface of each of the inserted collimator plates, the plurality of engaging portions each adapted to urge the plate surface toward a side wall of a corresponding groove of the plurality of grooves formed in each of the pair of holding members. 17. A radiation detection device according to claim 16,wherein the plurality of engaging portions comprises a plurality of notched grooves that are formed in the urging member in a position substantially the same as position of the plurality of grooves in each of the pair of holding members, andwherein each of the plurality of collimator plates is held grippingly between a side wall of the corresponding groove of the plurality of grooves formed in each of the holding members and a side wall of a corresponding notched groove in the urging member. 18. A radiation detection device according to claim 17, wherein the urging member is disposed in abutment against or in proximity to a surface defined by each of the plurality of grooves of each of the pair of holding members. 19. A radiodiagnostic system comprising:a scanning gantry comprising a radiation irradiation device; anda radiation detecting device comprising a collimator unit, said collimator unit comprising:a pair of holding members each comprising a plurality of grooves formed in respective mutually opposed surfaces;a plurality of collimator plates inserted respectively into the plurality of grooves formed in each of the pair of holding members; andan urging member disposed between the pair of holding members and comprising a plurality of engaging portions each adapted to engage a plate surface of each of the inserted collimator plates, the plurality of engaging portions each adapted to urge the plate surface toward a side wall of a corresponding groove of the plurality of grooves formed in each of the pair of holding members. 20. A radiodiagnostic system according to claim 19,wherein the plurality of engaging portions comprises a plurality of notched grooves that are formed in the urging member in a position substantially the same as position of the plurality of grooves in each of the pair of holding members,wherein each of the plurality of collimator plates is held grippingly between a side wall of the corresponding groove of the plurality of grooves formed in each of the holding members and a side wall of a corresponding notched groove in the urging member, andwherein the urging member is disposed in abutment against or in proximity to a surface defined by each of the plurality of grooves of each of the pair of holding members.