Multi-directional actuator
An apparatus is provided. The apparatus includes a bidirectional comb drive actuator. The apparatus may also include a cantilever. The cantilever includes a first end connected to the bidirectional comb drive actuator and a second end connected to an inner frame. In addition, the cantilever may include first and second conductive layers for routing electrical signals. Embodiments of the disclosed apparatuses, which may include multi-dimensional actuators, allow for an increased number of electrical signals to be routed to the actuators. Moreover, the disclosed apparatuses allow for actuation multiple directions, which may provide for increased control, precision, and flexibility of movement. Accordingly, the disclosed embodiments provide significant benefits with regard to optical image stabilization and auto-focus capabilities, for example in size- and power-constrained environments.
1. A multi-directional actuator for moving a device, the multi-directional actuator comprising:
one or more bidirectional comb drive actuators, each of the bidirectional comb drive actuators comprising:
two or more comb drives, each of the comb drives comprising first and second comb finger arrays extending from a first and second spine of the comb drives; and
first and second frame pieces, wherein the first frame piece is parallel to the second frame piece, wherein at least a portion of each of the first and second frame pieces surrounds the two or more comb drives, wherein the first and second spines run vertically from the first frame piece to the second frame piece in parallel, and wherein the first spine is attached to the first frame piece and wherein the second spine is attached to the second frame piece;
wherein the first comb finger array of the first comb drive and the second comb finger array of the second comb drive are connected to the second frame piece, and wherein the second comb finger array of the first comb drive and the first comb finger array of the second comb drive are connected to the first frame piece.
2. The actuator of claim 1 , further comprising an inner frame connected to the bidirectional comb drive actuators by one or more cantilevers, each of the cantilevers comprising routing for a first electrical signal, at least one of the cantilevers further comprising routing for a second electrical signal.
3. The multi-directional actuator of claim 2 , further comprising an outer frame connected to the inner frame by one or more spring elements, wherein the bidirectional comb drive actuators are attached to a central anchor that is mechanically fixed with respect to the outer frame.
4. The multi-directional actuator of claim 3 , wherein, for each of the bidirectional comb drive actuators:
the cantilever electrically couples the bidirectional comb drive actuator to one or more contact pads disposed on the inner frame; and
the spring elements electrically couple the contact pads disposed on the inner frame to one or more corresponding contact pads disposed on the outer frame.
5. The multi-directional actuator of claim 2 , wherein a platform mechanically fixes the central anchor with respect to the outer frame; and wherein the platform is selected from the group consisting of an optoelectronic device and an image sensor.