Actuator Coil Straddle Wiring for Higher Force and Lower Heating
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Solution Overview
Problem
Existing actuator devices face challenges in achieving a large driving force while minimizing heating and improving reliability and manufacturability, particularly when increasing the current input to the coil, due to the limitations of coil size and vibration transmission.
Innovation Solution
The actuator device incorporates a spiral coil with a straddle wiring that has a larger width than the coil and a thinner thickness, connected to the coil's inner end portion, which reduces wiring resistance and allows for stable arrangement, thereby suppressing heating and enhancing reliability and manufacturability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the amount of current input to the coil is increased to increase the driving force, then the driving force increases, but the heating amount increases
Solution Approach 1:
The patent changes the physical parameters of the wiring by increasing its width and decreasing its thickness to reduce electrical resistance. This allows higher current to flow through the coil without generating excessive heat, as the reduced resistance minimizes I²R heating in the wiring itself.
2Force
If the number of turns of the coil is increased to increase the driving force, then the driving force increases, but the size of the second movable part must be increased
Solution Approach 1:
The patent transitions from increasing coil turns (a two-dimensional parameter) to optimizing wiring cross-sectional dimensions (adding a third dimensional consideration). By adjusting the width and thickness of the wiring, the patent achieves current increase without proportionally increasing the coil's planar footprint or the movable part's volume.
3Loss of energy
If the width of the straddle wiring is increased to reduce wiring resistance, then the wiring resistance decreases, but the arrangement stability must be ensured
Solution Approach 1:
The patent simultaneously optimizes two parameters of the straddle wiring: increasing width to reduce resistance and decreasing thickness to improve arrangement stability. This dual parameter adjustment resolves the contradiction by making the wiring both electrically efficient and mechanically stable.
4Manufacturing precision
If the thickness of the straddle wiring is decreased to suppress surface irregularities, then the surface irregularities are suppressed, but the wiring resistance may increase
Solution Approach 1:
The patent compensates for the increased resistance from reduced thickness by simultaneously increasing the wiring width. This maintains the cross-sectional area (and thus resistance) while achieving the desired reduction in surface irregularities and improved arrangement stability.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration effectively suppresses heating increases even with higher current input, improves reliability by stable wiring arrangement, and simplifies manufacturing by minimizing surface irregularities.
Implementation Method 1
a magnetic field generator that generates a magnetic field to act on the coil
Implementation Method 2
since the wiring resistance of the straddle wiring can be reduced, an increase in the heating amount can be suppressed even though the amount of current input to the coil is increased
Data Source
AI summary
An actuator device includes a support part, a first movable part, a second movable part, a first connecting part, a second connecting part, a spiral coil provided to the second movable part, a magnetic field generator, a first external terminal provided to the support part; and a first wiring connected to an inner end portion of the coil and the first external terminal. The first wiring includes a lead wiring connected to the first external terminal, and a straddle wiring formed in a shape of a layer, provided to the second movable part so as to straddle the coil, and connected to the inner end portion of the coil and the lead wiring. A thickness of the straddle wiring is smaller than a thickness of the coil. The straddle wiring is electrically insulated from the mirror surface.