Planar Dynamic Transducer Magnet Arrangement with Localized Opening
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Solution Overview
Problem
Planar dynamic sound transducers face a challenge in balancing sound transmission and drive power, as a higher degree of opening in the magnet arrangement improves sound transmission but reduces drive power, and existing designs are inadequate in addressing the specific frequency-dependent requirements of audio range frequencies.
Innovation Solution
A planar dynamic sound transducer with a magnet arrangement featuring a small region with a higher degree of opening, preferably less than 30% of the diaphragm area, strategically positioned near the ear canal in headphones, and varying the width of air gaps and magnet bars to optimize sound transmission and drive power across different frequency ranges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the degree of opening in the magnet arrangement is increased to improve sound transmission, then acoustic transparency is improved, but drive power is reduced
Solution Approach 1:
The magnet arrangement is divided into different regions with different opening degrees: a first region with a first degree of opening and a second region with a second degree of opening, where the first degree is greater than the second degree. This local differentiation allows the first region to provide better acoustic transparency for high frequencies while the second region maintains sufficient drive power for lower frequencies.
2Ease of manufacture
If the degree of opening is uniformly increased across the entire magnet arrangement, then high frequency sound transmission is improved, but drive power for low frequencies is reduced
Solution Approach 1:
The magnet arrangement implements spatially varying opening degrees where the first region (with greater opening) is positioned to handle high frequency sounds while the second region (with lesser opening) maintains drive power for low frequencies. This resolves the contradiction by applying different opening degrees to different functional regions rather than using a uniform design.
3Power
If the degree of opening is uniformly reduced across the entire magnet arrangement, then drive power is improved, but sound transmission is reduced
Solution Approach 1:
The magnet arrangement combines regions with different opening degrees: the second region has a lesser degree of opening to provide drive power, while the first region has a greater degree of opening to ensure sound transmission. This hybrid approach resolves the contradiction by distributing different opening degrees to different regions based on their functional requirements.
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 enhances acoustic transparency for high frequencies while maintaining sufficient drive power for lower frequencies, improving the distribution of acoustic load and reducing unwanted vibration modes, thus achieving a compromise between sound transmission and drive power.
Implementation Method 1
The planar dynamic transducer is a member of the group of dynamic electromagnetic sound transducers. Electrical conductors are provided on the diaphragm. The position and the direction of the electrical conductors is adapted to the magnetic poles of the two magnet arrangements.
Implementation Method 2
The transducer 100 further has a first and a second magnet arrangement 120, 140, the first magnet arrangement 120 being provided above the diaphragm 110 and the second magnet arrangement 140 beneath the diaphragm 110. Both the width of the magnet bars 121, 122 and also the width of the air gap 123 are constant.
Data Source
AI summary
A planar dynamic sound transducer comprising a planar diaphragm having at least one electrical conductor, and a planar magnet arrangement having a first portion, a second portion, and an edge region. The second portion surrounds the first portion and extends between the first portion and the edge region of the magnet arrangement. The first portion contains a first plurality of openings so that the first portion has a first degree of opening. The second portion contains a second plurality of openings so that the second portion has a second degree of opening. The first degree of opening is greater than the second degree of opening.