Interlocking Comb Electrodes for Low-Voltage MEMS Mirrors

The patent transitions from planar electrode arrangements to three-dimensional interlocking comb structures with teeth extending vertically from both top and bottom surfaces of the substrate. This dimensional transformation increases the effective electrode surface area and creates multiple interaction points, thereby enhancing torque generation efficiency at low operating voltages while maintaining manufacturability through standard MEMS fabrication processes.

The design features interlocking comb structures where top electrodes and bottom electrodes nest within each other's spatial arrangement. The comb teeth from the top surface interlock with corresponding teeth from the bottom surface, creating a nested configuration that maximizes the electrostatic interaction area. This nested arrangement improves torque efficiency by increasing the effective capacitance gradient without requiring larger overall device dimensions or more complex manufacturing steps.

The electrode structures are segmented into multiple comb teeth distributed across the device area. Each tooth pair acts as an independent electrostatic actuator contributing to the total torque. This segmentation distributes the electrostatic force generation across multiple small elements, each operating within its linear range, thereby maintaining overall response linearity while achieving high total torque output through the cumulative effect of all segmented elements.

By extending electrodes into the third dimension with vertical comb teeth rather than using planar surfaces, the patent increases the effective interaction area without increasing lateral dimensions. This dimensional approach allows more electrode surface area to participate in torque generation at low voltage potentials, improving the voltage-to-torque efficiency ratio and maintaining linear response characteristics across the operating range.

The interlocking comb structures create a nested configuration where top and bottom electrodes fit within each other's spatial envelope. This nested arrangement provides mutual mechanical support and distributes stress across multiple contact points, enhancing the structural rigidity and mechanical robustness of the miniaturized device. The interlocking geometry acts as a mechanical reinforcement that prevents deformation while maintaining compact dimensions suitable for portable applications.

The patent employs a composite structural approach combining multiple electrode materials and substrate configurations to achieve high mechanical strength in a miniaturized form factor. The interlocking comb structures utilize different materials with complementary mechanical properties, creating a composite assembly that resists deformation and maintains structural integrity despite the reduced overall device size required for portable telecommunication applications.

The patent resolves this contradiction by extending electrodes into the vertical dimension with comb teeth that protrude from both top and bottom surfaces. This three-dimensional configuration increases the effective electrode surface area and capacitance interaction volume without expanding the lateral footprint of the device. The vertical extension of comb teeth provides additional active area for electrostatic force generation while maintaining compact overall dimensions suitable for portable applications.

The interlocking comb structures from top and bottom surfaces nest within each other's spatial arrangement, maximizing the use of available volume. This nested configuration allows the electrode surfaces to be positioned in close proximity over an extended vertical range, increasing the effective interaction area and torque efficiency without requiring larger lateral dimensions. The nested geometry efficiently packs the electrode surface area within the constrained device volume.