Micro Planar Speaker With Bonded Coil and Thin Diaphragm
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Solution Overview
Problem
Traditional speakers with large vibrating diaphragms and magnetic structures are not suitable for compact devices like insert earphones, mobile phones, or tablet computers due to their size and volume.
Innovation Solution
A micro planar speaker design featuring a thin planar diaphragm with a coil conductor bonded via an adhesive layer, a magnetic gap formed by spacers and plates, and a circuit board for electric connection, allowing for a compact size and efficient sound production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a traditional speaker uses a large vibrating diaphragm with coil conductor and double-ended magnetic structure, then the sound quality is maintained, but the size and volume become too large for compact devices
Solution Approach 1:
The speaker is divided into distinct functional layers: planar diaphragm with coil conductor, spacers forming magnetic gaps, and separate magnetic structures. This segmentation allows each component to be optimized independently while maintaining overall compactness and sound quality.
Solution Approach 2:
The invention transitions from traditional three-dimensional magnetic structures to a planar two-dimensional configuration. The magnetic gaps are formed between parallel plates rather than using bulky radial magnetic structures, enabling the speaker to achieve compact volume while preserving acoustic performance.
2Length of stationary object
If a traditional speaker uses a double-ended magnetic structure, then the magnetic field strength is sufficient, but the thickness of the speaker increases
Solution Approach 1:
The magnetic structure is reconfigured from a radial double-ended arrangement to a planar configuration with magnetic gaps formed between parallel plates. This dimensional change reduces the thickness direction length while maintaining magnetic field effectiveness through optimized gap geometry and conductor arrangement.
Solution Approach 2:
The planar diaphragm with bonded coil conductor acts as a thin flexible structure that can be positioned within the magnetic gaps formed by the plate structures. This thin-film approach enables sufficient magnetic field interaction without requiring thick magnetic components.
3Area of moving object
If the coil conductor is made of aluminum foil with large diameter, then the electrical connection is good, but the area and size of the vibrating diaphragm become too large
Solution Approach 1:
The coil conductor is implemented as a thin flexible aluminum foil that can be bonded directly to the planar diaphragm surface. This thin-film coil conductor achieves adequate electrical connection and magnetic interaction while minimizing the diaphragm area and enabling compact speaker design.
Solution Approach 2:
The coil conductor is merged with the diaphragm surface through bonding, creating an integrated planar structure. This merging eliminates the need for separate large-diameter coil assemblies and reduces the overall diaphragm area while maintaining electrical and magnetic functionality.
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
The micro planar speaker achieves a diameter of 15 mm or less, a frequency spectrum of 20 Hz-40 KHz with less than 1% sound distortion, and a total thickness of less than 10 micrometers, making it suitable for small devices while maintaining good sound quality.
Implementation Method 1
The planar diaphragm comprises a vibrating diaphragm and one or more coil conductor; the coil conductor is stretched and bonded onto the vibrating diaphragm
Implementation Method 2
an upper and a lower spacers respectively disposed at the upper side surface and the lower side surface of the planar diaphragm, and each defining a cavity so as to form a magnetic gap at the side surface of the planar diaphragm
Data Source
AI summary
A micro speaker includes a planar diaphragm, spacers respectively disposed at one side surface of the planar diaphragm, an upper plate and a lower plate, one or more magnets and a circuit board. The planar diaphragm includes a vibrating diaphragm and a coil conductor. The coil conductor is stretched and bonded onto the vibrating diaphragm via an adhesive layer on the upper side surface of the planar diaphragm; the coil conductor is electrically connected to the circuit board. The speaker in this present invention can get a diameter of 15 mm or less, and a height is 5 mm or less.