SUBSTRATE HOLDER AND CLIPPING DEVICE
The invention relates to a substrate holder comprising a substrate support, moveable clipping device configured to engage a substrate positioned on the support in a first position and to be positioned away from the substrate in a different position, a positioning device for moving the clipping device from the second position towards the first position. To prevent a contact between the clipping device and support when no substrate is positioned thereon, an elastic stop element is used which limits the movement of the clipping device. The invention furthermore relates to a clipping device and an ion implanter using the substrate holder and the clipping device.
1 . A substrate holder comprising:
a substrate support;
moveable clipping means configured to engage a substrate on the substrate support in a first position and to be positioned away from the substrate in a second position;
resilient positioning means for moving the clipping means from the second position to the first position; and
an elastic stop element for limiting the movement of the clipping means towards the substrate support in the direction defined by the second and first position, such that even in the absence of a substrate on the substrate support, the clipping means remains positioned away from the substrate support.
2 . The substrate holder according to claim 1 wherein the moveable clipping means, the positioning means and the stopping means form one modular unit.
3 . The substrate holder according to claim 2 wherein the modular unit comprises a connecting plate for connecting the module unit to the substrate support.
4 . The substrate holder according claim 1 wherein the substrate support comprises a metallic plate and wherein the clipping means comprises a metal.
5 . The substrate holder according to claim 1 wherein the elastic stop element comprises one or more of polyvinylidene fluoride (PVDF) or poly ether ether ketone (PEEK).
6 . The substrate holder according to claim 1 further comprising a counter positioning means for moving the clipping means from the first to the second position in dependence on rotational forces.
7 . A clipping device for releasably keeping a substrate on a substrate holder according to claim 1 comprising:
moveable clipping means;
positioning means for linearly moving the clipping means; and
an elastic stop element, for limiting the extent of the positioning movement of the clipping means imposed by the positioning means at least in one direction.
8 . The clipping device according to claim 7 wherein the elastic stop clement is of polyvinylidene fluoride (PVDF) or poly ether ether ketone (PEEK).
9 . The clipping device according to claim 7 wherein the elastic stop element is stationary.
10 . The clipping device according to claim 7 wherein the clipping means comprises a pin region and a stop element engagement plate configured and arranged such that the stop element engagement plate comes into contact with the stopping means to thereby stop the movement of the clipping means.
11 . The clipping device according to claim 10 wherein the stop element engagement plate is configured and arranged such that it at least partially masks the elastic stop element.
12 . An ion implanting device comprising a substrate holder according to claim 1 and a clipping device comprising:
moveable clipping means;
positioning means for linearly moving the clipping means; and
an elastic stop element, for limiting the extent of the positioning movement of the clipping means imposed by the positioning means at least in one direction.