How Bose Prevents Noise-Canceling Headphones From Breaking During Loud Sounds
A 1993 Bose patent describing a physical design for noise-canceling headphones that prevents the speaker diaphragm from collapsing or popping out of place during intense audio pressure.
Original patent title: “High compliance headphone driving”
A 1993 Bose patent describing a physical design for noise-canceling headphones that prevents the speaker diaphragm from collapsing or popping out of place during intense audio pressure. Granted to Bose Corp in 1993 with 7 claims and 54 forward citations.
Key facts
Coverage
What does this patent actually cover?
This patent describes a way to make noise-canceling headphones more durable when dealing with high-pressure sound waves. Because active noise reduction systems often use very flexible (high compliance) speaker diaphragms, these parts can easily be pushed too far, causing the voice coil to pop out of its magnetic gap or the diaphragm to get stuck in a collapsed state. The invention adds physical limiters, such as plastic elements or wire mesh screens, to stop the diaphragm from moving beyond a safe distance. It also includes specific shapes or indentations in the diaphragm material that act like a spring, ensuring the speaker snaps back to its original shape if it ever gets squashed.
The gap
What does this patent NOT cover?
- Does not cover the electronic noise-cancellation algorithms (the 'active' part of the system).
- Does not cover standard headphones that lack the high-compliance diaphragm design.
- Does not cover software-based limiters or digital signal processing (DSP) used to cap volume.
- Does not cover non-mechanical methods for preventing diaphragm damage.
These exclusions are unique to PatentBrief — derived from the actual claim language, not patent-office boilerplate.
What made this novel
The invention treats the speaker diaphragm like a mechanical spring that needs physical 'bump stops' to prevent it from over-extending or permanently deforming under high pressure.
Schematic visualization of the patent's claim structure. Hand-drawn diagrams in progress for each landmark patent.
Where you've seen this
Real-world examples
Bose QuietComfort series
Aviation headsets
High-end active noise-canceling headphones
Why it matters
The bigger picture
This patent was crucial for the early development of reliable active noise-canceling (ANC) headsets, which were originally designed for pilots. By solving the mechanical failure points of high-compliance drivers, Bose was able to commercialize the technology that eventually became the standard for modern travel and consumer audio.
Filed
October 16, 1991
Granted
January 19, 1993
Market context
Who's building on this
Companies in this space
Bose Corporation remains the primary entity building on this foundational work, as they have dominated the consumer ANC market for decades. Other manufacturers like Sony and Sennheiser have developed their own variations of driver protection, but the core concept of mechanical excursion limiting remains a standard engineering challenge in the industry.
Market impact
This patent helped move active noise cancellation from a niche military and aviation tool to a mass-market consumer product. By ensuring these sensitive devices wouldn't break during normal use, it enabled the multi-billion dollar market for premium noise-canceling headphones that exists today.
Claim 1 — Plain English
What this patent covers
This patent describes a way to make noise-canceling headphones more durable when dealing with high-pressure sound waves. Because active noise reduction systems often use very flexible (high compliance) speaker diaphragms, these parts can easily be pushed too far, causing the voice coil to pop out of its magnetic gap or the diaphragm to get stuck in a collapsed state. The invention adds physical limiters, such as plastic elements or wire mesh screens, to stop the diaphragm from moving beyond a safe distance. It also includes specific shapes or indentations in the diaphragm material that act like a spring, ensuring the speaker snaps back to its original shape if it ever gets squashed.
The clever bit
The invention treats the speaker diaphragm like a mechanical spring that needs physical 'bump stops' to prevent it from over-extending or permanently deforming under high pressure.
What it does not cover
- Does not cover the electronic noise-cancellation algorithms (the 'active' part of the system).
- Does not cover standard headphones that lack the high-compliance diaphragm design.
- Does not cover software-based limiters or digital signal processing (DSP) used to cap volume.
- Does not cover non-mechanical methods for preventing diaphragm damage.
Patent timeline
Application submitted to the patent office
Application published, typically 18 months after filing
Patent officially issued
PatentBrief Score
Impact Score
Moderate
Citation count
35/40
Highly cited
Claim breadth
5/20
Moderate scope
Recency
0/20
Older than 20 years
Assignee scale
0/20
Independent or smaller assigneeassigneeThe entity that owns the patent — usually the inventor's employer or a company.Read more →
PatentBrief Impact Score — based on citation count, claim breadth, recency, and assignee scale. Not a legal assessment.
Heuristic Value Estimate
What this patent might be worth
$41K – $130K
Midpoint $81K · expired or expiring · industry ×1.5
Heuristic only — blends forward/backward citation counts, claim scope, time remaining, litigation history, and CPC-derived industry baseline. Real valuations need a professional appraisal.
The original legal language
Original claims
7 claims as filed with the patent office.
Concepts involved
Citations
Patent lineage
Cite this patent
Breen, J. J., & Sapiejewski, R. (1993). How Bose Prevents Noise-Canceling Headphones From Breaking During Loud Sounds (U.S. Patent No. 5,181,252). U.S. Patent and Trademark Office. https://patentbrief.org/patent/us/5181252/acoustic-noise-cancelling
Auto-generated from the patent record. Double-check author order and the issue date against the official USPTO document before submitting.
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Common Questions
Frequently Asked Questions
What does How Bose Prevents Noise-Canceling Headphones From Breaking During Loud Sounds cover?
A 1993 Bose patent describing a physical design for noise-canceling headphones that prevents the speaker diaphragm from collapsing or popping out of place during intense audio pressure.
Who owns patent US 5181252?
Bose Corp owns this patent, granted in 1993.
When does this patent expire?
This patent has expired and is now in the public domain — anyone can use the invention freely.
What is patent US 5181252 cited by?
This patent has been cited by 54 later patents that build on its ideas.
What problem does this patent solve?
This patent was crucial for the early development of reliable active noise-canceling (ANC) headsets, which were originally designed for pilots. By solving the mechanical failure points of high-compliance drivers, Bose was able to commercialize the technology that eventually became the standard for modern travel and consumer audio.
What does this patent NOT cover?
Does not cover the electronic noise-cancellation algorithms (the 'active' part of the system).
Patent monitoring