Apple Granted Patent for Underwater Apple Watch Speaker Using Display as Acoustic Diaphragm

Technology publication Patently Apple reported on July 8 that Apple has been granted a new patent for an underwater speaker system for Apple Watch. The technology is designed to deliver critical safety alerts to divers, including ascent rate warnings, dive duration notifications, tank pressure warnings, depth alerts, and emergency distress signals.

The Challenge of Underwater Communication

According to the patent, underwater environments pose significant challenges for conventional notification methods:

• Standard speakers cannot vibrate effectively in water and fail to transmit sound reliably
• Haptic feedback (vibration) is easily missed by users wearing wetsuits or gloves

Apple describes these two limitations as creating a "blind spot" in underwater communication.

The Display as Acoustic Diaphragm: An Innovative Solution

To address these challenges, Apple's patent proposes a novel design that repurposes the display as an acoustic diaphragm. The core mechanism works as follows:

1. An actuator is introduced to drive the display via rapid internal reciprocating motion
2. The display functions as a rigid acoustic diaphragm, converting electrical energy into mechanical energy
3. The vibrating display generates pressure waves in the water, producing transmissible sound

According to the patent, the device can emit sound waves within the human-audible range of approximately 50Hz to 15,000Hz, and can also produce non-audible frequencies for detection by electronic devices or sonar-like applications.

Deformable Seal and Dynamic Pressure Adjustment

The patent also describes a deformable seal design that serves two critical functions:

• Maintaining the device's waterproof integrity to prevent water ingress
• Allowing the display to vibrate freely while remaining sealed

Additionally, the system can dynamically adjust actuator driving force based on detected underwater pressure:

• At greater depths: Higher water pressure requires increased driving force to achieve the desired acoustic output
• At shallower depths: Driving force can be reduced to conserve battery power

Potential Use Cases

If implemented in a future Apple Watch product, this technology could provide divers with the following practical safety alerts:

Use Case	Description
Ascent rate warning	Alerts divers against ascending too quickly to prevent decompression sickness
Dive duration alert	Notifies the user of total time spent underwater
Tank pressure warning	Real-time alert when oxygen supply runs low
Depth warning	Alerts when the diver exceeds a safe depth
Emergency distress signal	Underwater emergency notification for rescue situations

The patent has been officially granted, but Apple has not indicated whether or when this technology will be incorporated into a commercial product.

Image source: Patently Apple

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