Electrode Structures
This invention describes an electrode structure formed from a plurality of individual electrodes, the individual electrodes being provided on separate submounts, the submounts being coupled to one another using kinematic ball mounts. Such a structure may be configured as a RF ion guide, mass filter or ion trap.
1 . An electrode cell formed from a plurality of individual electrodes, the individual electrodes being provided on separate submounts, the submounts being kinematically coupled to one another using kinematic ball mounts.
2 . The cell of claim 1 wherein the kinematic ball mounts are located by means of a micromachined alignment feature on respective submounts.
3 . The cell of claim 1 wherein the kinematic ball mounts are electrically isolated from the electrodes.
4 . The cell of claim 3 wherein the kinematic ball mounts are fabricated from an insulator.
5 . The cell of claim 3 wherein the kinematic ball mounts are fabricated from a conductor which is electrically isolated from the electrodes.
6 . The cell of claim 3 wherein balls of the kinematic ball mounts are made from glass, ceramic, composite or metal.
7 . The cell of claim 1 wherein the kinematic ball mounts concurrently align and connect the submounts.
8 . The cell of claim 1 wherein a submount has a feature machined into it to alignment, fix and support a kinematic ball mount.
9 . The cell of claim 1 wherein the electrodes are aligned between the kinematic ball mounts.
10 . The cell of claim 9 wherein the balls of the kinematic ball mounts have a greater radius than the radius of the electrodes.
11 . The cell of claim 1 comprising first and second kinematic ball mounts.
12 . The cell of claim 1 comprising four kinematic ball mounts.
13 . The cell of claim 1 wherein the electrodes are solid electrodes or have an insulating core with a conducting surface thereon.
14 . The cell of claim 1 including a voltage generator operably providing a voltage of a predefined frequency to selected ones of the plurality of electrodes, the voltage generator typically providing an AC voltage and optionally being operable in a switch mode configuration.
15 . The cell of claim 14 wherein the individual electrodes are substantially identical such that the field lines that are generated by each of the electrodes will be substantially equal.
16 . The cell of claim 1 being operable to effect generation of a pseudopotential well which may be used to filter, trap or guide ions or other charged particles.
17 . A mass filter or ion guide or ion trap including one or more cells as claimed in claim 1 .
18 . A microfabricated device having a first and second insulating substrate each having a plurality of submounts provided thereon and wherein individual submounts are individually electrically addressable and provide a support for an electrode, and wherein the submounts are located relative to one another on their respective substrate such that when the two substrates are brought together in a sandwich structure, kinematic ball mounts concurrently align and connect the two substrates.
19 . A microfabricated device comprising a first and second substrate, each substrate supporting individual electrodes which are electrically addressable, the substrates further comprising kinematic ball mounts arranged such that when the two substrates are brought together in a sandwich structure, the kinematic ball mounts concurrently align and connect the two substrates.