Coupling schemes for gimbaled scanning mirror arrays
A scanning device includes a substrate, which is etched to define an array of two or more parallel rotating members and a gimbal surrounding the rotating members. First hinges connect the gimbal to the substrate and defining a first axis of rotation, about which the gimbal rotates relative to the substrate. Second hinges connect the rotating members to the support and defining respective second, mutually-parallel axes of rotation of the rotating members relative to the support, which are not parallel to the first axis.
1. A scanning device, comprising:
a substrate, which is etched to define:
an array of two or more parallel rotating members;
a gimbal surrounding the rotating members and having a magnetic rotor fixed thereto; and
respective hinges connecting the rotating members to the support, thereby defining respective parallel axes of rotation of the rotating members relative to the support;
permanent magnets, which are fixed to the rotating members and configured to synchronize an oscillation of the rotating members about the respective axes by exerting a magnetic force between the rotating members; and
an electromagnetic drive, which is coupled to drive the rotor so as to cause the gimbal and the rotating members to rotate, while the oscillation of the rotating members is synchronized by the permanent magnets.
2. The device according to claim 1 , wherein the permanent magnets are configured to cause the rotating members to oscillate in phase, so that the rotating members have the same angular orientation during oscillation.
3. The device according to claim 1 , wherein the permanent magnets are configured so as to cause the rotating members to oscillate in anti-phase.
4. The device according to claim 1 , wherein the oscillation of the rotating members is synchronized by a magnetic attraction between the permanent magnets.
5. The device according to claim 1 , wherein the oscillation of the rotating members is synchronized by a magnetic repulsion between the permanent magnets.
6. The device according to claim 1 , wherein the rotating members comprise plates, and the device comprises a reflective coating applied to the substrate on a front surface of the plates, whereby the plates function as micromirrors, and wherein each of the permanent magnets is fixed to a back surface of a respective one of the plates.