Tapered Multi-Chamber Cajón with Piezo Pickup
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Solution Overview
Problem
Conventional cajón drums are difficult to amplify, burdensome to transport, and limited in their percussive capabilities due to their size and one-sided design, which restricts musicians' options and increases costs for achieving varied sounds.
Innovation Solution
A multi-percussive hand drum with a tapering shape, featuring two acoustic chambers and a sound board with a piezo pickup for amplification, allowing for varied sounds and easy transport, and can be used as a standalone instrument or part of a larger setup.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional cajón drums are made with thicker wood for structural integrity, then strength is improved, but weight increases making them burdensome to transport
Solution Approach 1:
The cajón is divided into multiple chambers (bass chamber and drum chamber) separated by internal structures. This segmentation allows each chamber to be optimized independently for strength and weight, reducing overall mass while maintaining structural integrity through strategic placement of thicker wood only where needed for structural support.
Solution Approach 2:
Thicker wood is applied locally only in critical structural areas rather than uniformly across the entire instrument. The front face, back plate, and internal chamber separators use thicker wood for strength, while non-critical areas use thinner wood to reduce weight, achieving optimal strength-to-weight ratio.
2Strength
If conventional cajón drums are made larger to provide better sound, then sound quality is improved, but portability deteriorates
Solution Approach 1:
The instrument is segmented into multiple functional chambers that can be arranged in compact configurations. The bass chamber and drum chamber are separated by internal walls and separators, allowing efficient space utilization that maintains acoustic volume while reducing overall external dimensions for better portability.
Solution Approach 2:
Chambers are nested within each other with internal separators and partitions that maximize acoustic volume within a compact external envelope. The multi-chamber design allows larger effective playing surface area while keeping the external footprint small enough for easy transport.
3Ease of manufacture
If conventional cajón drums are designed as one-sided instruments, then manufacturing simplicity is improved, but versatility deteriorates
Solution Approach 1:
The instrument is divided into multiple playable chambers (bass chamber with front face, drum chamber with drum head) and internal separators that can all be struck to produce different sounds. This segmentation transforms a simple one-sided design into a multi-functional instrument with diverse percussive capabilities while maintaining relatively simple construction processes.
Solution Approach 2:
Multiple surfaces and chambers are designed to be playable, each producing different timbres and tones. The front face, back plate, internal separators, and drum head all serve as playable surfaces, making the instrument versatile for various musical styles and playing techniques while using standard manufacturing methods.
4Device complexity
If conventional cajón drums lack amplification capability, then simplicity is improved, but amplifiability deteriorates
Solution Approach 1:
The acoustic instrument is merged with electronic amplification components (pickups, preamp, controls) integrated into the cajón structure. This combination allows the instrument to function both as a traditional acoustic percussion instrument and as an amplified electric instrument, expanding versatility while maintaining the core simplicity of the cajón design.
Solution Approach 2:
The instrument is designed to operate in multiple modes: acoustic-only, amplified-only, and combined acoustic-electric. The integrated pickup system and controls allow musicians to switch between different playing scenarios, making the instrument universally applicable to various performance settings without compromising the basic acoustic 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
Enables versatile and amplified percussive performances in various settings without the need for multiple instruments, offering a compact, portable solution for musicians to create diverse sounds and tones.
Implementation Method 1
a pickup device (e.g., a piezo pickup) to provide amplifying abilities for the sounds generated with the percussion instrument
Implementation Method 2
a sound board having the tapering shape arranged between the first acoustic chamber housing and the second acoustic chamber housing to form a first acoustic chamber defined by the first acoustic chamber housing and the sound board
Data Source
AI summary
A percussion instrument including a first acoustic chamber housing having a tapered shape, a second acoustic chamber housing having the tapered shape, a sound board having the tapered shape arranged between the first acoustic chamber housing and the second acoustic chamber housing to form a first acoustic chamber defined by the first acoustic chamber housing and the sound board, and a second acoustic chamber defined by the second acoustic chamber housing and the sound board.