Driving apparatus for optical scanning device
View Patent ↗A driving apparatus ( 1 ) for an optical scanning device ( 5 ) has a threaded spindle ( 16 ) onto which a spindle nut ( 23 ) is threaded. The driving apparatus ( 1 ) further includes a coupler ( 24 ) for coupling the spindle nut ( 23 ) to the scanning device ( 5 ). The coupler ( 24 ) effects a Cardan coupling in the manner of a Cardan joint. In a technically simple way particularly good synchronisation can be guaranteed during scanning.
1. A driving apparatus for an optical scanning device, comprising:
a threaded spindle onto which a spindle nut is threaded; and
coupler for coupling the spindle nut to the scanning device, the coupler effecting a coupling in the manner of a Cardan or universal joint.
2. The apparatus according to claim 1 , wherein the coupler has a connection piece, which is discoidal, for connecting to the scanning device and at least one discoidal joint plate, which is disposed between the spindle nut and the connection piece, the spindle nut, the at least one joint plate and the connection piece being disposed parallel to one another.
3. The apparatus according to claim 2 , wherein between both the spindle nut and the at least one joint plate and between the at least one joint plate and the connection piece two diametrically opposed bearings are provided by means of which Cardan axes of rotation are formed.
4. The apparatus according to claim 3 , wherein in the surface of the spindle nut facing towards the at least one joint plate and in the surface of the at least one joint plate facing towards the spindle nut, two diametrically opposed indentations are respectively provided, the indentations in the surface of the spindle nut lying opposite those in the surface of the at least one joint plate and balls being disposed between the indentations of the spindle nut lying opposite one another and the at least one joint plate, and in the surface of the connection piece facing towards the at least one joint plate and in the surface of the at least one joint plate facing towards the connection piece two diametrically opposed indentations are also respectively provided, the indentations in the surface of the connection piece lying opposite the indentations in the surface of the at least one joint plate and balls being disposed between the indentations of the connection piece lying opposite one another and the at least one joint plate.
5. The apparatus according to claim 4 , wherein one of the four indentations of two surfaces lying opposite one another is in the form of an oblong indentation.
6. The apparatus according to claim 2 , wherein the spindle nut and the connection piece are connected to one another by a connection which is designed and arranged such that it holds the coupler together.
7. The apparatus according to claim 6 , wherein the connection has at least one spring, a tension spring.
8. The apparatus according to claim 1 , wherein the coupler is a Cardan coupling in the manner of a Cardan double joint.
9. The apparatus according to claim 8 , wherein three parallel joint plates are provided which are disposed adjacent to one another and between the spindle nut and the connection piece.
10. The apparatus according to claim 1 , wherein the scanning device reads out X-ray information stored in a storage phosphor layer.
11. The apparatus according to claim 10 , wherein the connection piece is connected to a support onto which the storage phosphor layer is laid.