Planar Coil Circuit Board for Compact Inkjet Printers
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Solution Overview
Problem
The miniaturization of liquid discharging apparatuses, such as inkjet printers, is hindered by the increased space occupation due to the larger component height of coils in class D amplifier circuits, which affects the circuit board's size and efficiency, leading to difficulties in compact design and potential ink discharge accuracy issues.
Innovation Solution
The circuit board design incorporates a coil configuration using wiring patterns on multiple layers, with overlapping wiring and through-holes to reduce the component height of the coil and minimize space, while maintaining sufficient inductance value, thereby reducing the overall size and improving heat management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a class D amplifier circuit with a coil is used to drive the piezoelectric element, then the driving signal can be generated with sufficient current amplification, but the component height of the coil increases, causing the circuit board to occupy more space
Solution Approach 1:
The patent transitions the coil from a three-dimensional component with significant height to a planar structure formed by wiring patterns on the circuit board. The coil is constructed using conductive traces on the board surface and through-hole connections, effectively moving the coil structure into the two-dimensional plane of the circuit board while maintaining its inductance function. This dimensional change eliminates the height issue while preserving the current amplification capability.
Solution Approach 2:
The patent replaces the traditional mechanical coil component with an electrical wiring pattern structure. Instead of using a physical coil component that occupies vertical space, the inductance is achieved through carefully designed conductive trace patterns on the circuit board. This substitution transforms a mechanical/electromagnetic component into an integrated electrical circuit solution, reducing overall device volume.
2Volume of moving object
If the coil component height is reduced to miniaturize the liquid discharging apparatus, then space occupation decreases, but maintaining sufficient inductance value becomes difficult
Solution Approach 1:
The patent divides the coil structure into multiple segments distributed across different layers of the circuit board. Instead of relying on a single compact coil, the inductance is achieved through multiple wiring pattern segments connected in series. These segments include trace portions on the board surface and through-hole connections, which collectively provide the required inductance value while maintaining a low-profile structure.
Solution Approach 2:
The patent embeds the coil structure within the circuit board itself, nesting the conductive traces and through-holes inside the board's multi-layer structure. The coil wiring patterns are integrated into the circuit board's internal layers and routing, effectively hiding the coil structure within the board's thickness rather than adding external height. This nesting approach maintains inductance while minimizing overall component height.
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 approach allows for a more compact and efficient liquid discharging apparatus by reducing the coil's component height, minimizing space occupation, and enhancing ink discharge accuracy, while also facilitating easier heat radiation and reducing the complexity of heat radiator processing.
Implementation Method 1
a smoothing circuit including a coil and a capacitor, and configured to generate the driving signal obtained by smoothing the amplified modulation signal
Implementation Method 2
a smoothing circuit including a coil and a capacitor, and configured to generate the driving signal obtained by smoothing the amplified modulation signal
Data Source
AI summary
A liquid discharging apparatus that includes a discharging head for discharging liquid, a driving circuit for generating a driving signal, and a circuit board, in which the driving circuit includes a coil and a capacitor, the circuit board includes a first layer, a second layer, first wiring provided at the first layer, second wiring provided at the second layer, and interlayer wiring, the first wiring couples a first start point and a first end point, and is provided in a circumferential shape, the second wiring couples a second start point and a second end point, and is provided in a circumferential shape, the interlayer wiring electrically couples the first end point and the second start point, the first wiring and the second wiring partially overlap each other, and the first wiring, the second wiring, and the interlayer wiring constitute at least a part of the coil.