Sound-Enhancing Mobile Cases
49 patents in this list
Updated:
Modern smartphones output audio between 40-85 dB through speakers that measure just 12-15mm in diameter, creating significant acoustic design constraints within the limited space of a phone case. These dimensional restrictions, combined with the need to maintain device protection and aesthetics, present distinct engineering challenges for passive sound amplification.
The fundamental challenge lies in designing acoustic chambers and waveguides that can effectively amplify sound while working within the spatial and material constraints of a protective case.
This page brings together solutions from recent research—including nested sound channel architectures, phase-shifted dual-cavity designs, expandable acoustic chambers, and integrated waveguide systems. These and other approaches demonstrate how passive acoustic amplification can be achieved while maintaining case functionality and manufacturability.
1. Mobile Phone with Volume Expansion Mechanism Incorporating U-Shaped Mounting Shell and Sound-Collecting Cavity
JIANGSU SOP TECH CO LTD, JIANGSU SOP TECHNOLOGY CO LTD, 2024
Mobile phone with a volume expansion mechanism to improve audio playback for elderly users with hearing loss. The phone has a built-in sound amplification mechanism on one side, along with an auxiliary mechanism to attach the speaker. The speaker enclosure has a U-shaped mounting shell with slots on the side facing away from the phone. Inside the shell is a block with a sound-collecting cavity. The block is positioned away from the phone. The phone body has amplifying cavities on that side, connected to the speaker's sound-collecting cavity. This design captures and amplifies sound from the speaker using the U-shaped shell and block, to boost volume for hearing-impaired users.
2. Mobile Terminal Shell with Sound Diffusion and Interactive Sensing System
深圳市哎哟宝贝科技有限公司, SHENZHEN AIYOBAOBEI TECHNOLOGY CO LTD, 2023
Mobile terminal sound optimization shell and interactive system to enhance audio from devices like smartphones, tablets, and watches. The shell has a built-in sound diffusion device with a microphone to capture audio from the device speaker, amplify it, and output through multiple surfaces. This provides omnidirectional sound projection. The shell also has sensors, LED displays, and a control system for interactive features. It can detect body movement, light levels, and touch inputs. The shell has a power circuit with battery, rectifier, DC/AC converter, and protection.
3. Acoustic Redirection Structures with Curved Openings for Enhanced Audio Output in Mobile Device Accessories
BARLOW DARCI, BARLOW HUBERT, 2023
Mobile device cases, docking stations, and devices with curved openings near the speaker locations to enhance audio output. The curved openings redirect the sound pressure towards the listener instead of away, improving volume and clarity compared to normal speakers. This provides a hands-free, convenient way to boost sound without requiring the device to be placed on surfaces or covered.
4. Mobile Device Case with Integrated Sound Channeling and Handle Strap Mechanism
Paul G. Martin, 2023
Mobile device case that improves audio quality, provides better drop protection and allows easy device access while reducing size and weight compared to traditional cases. The case has a unique design to redirect sound emitted from the device speakers. It has nested sound channels within the case walls that connect to a chamber around the device speaker. This guides the sound out of the case instead of just through the bottom. It also has a built-in handle strap that protrudes away from the device when wrapped around, making it easier to grip. The strap support prevents it from collapsing into the case when not in use.
5. Phone Case with Integrated Acoustic Slit for Enhanced Audio Output
SHENZHEN WEISHI ACOUSTICS CO LTD, 2023
A loudspeaker phone case that enhances the audio output of mobile devices without needing external speakers or amplifiers. The case has a slit on the bottom left or right side that faces the phone's speaker opening when installed. The slit's area is larger than the phone's speaker opening, so sound amplification occurs as it exits through the slit instead of the phone's small speaker hole. This provides louder audio without maxing out the phone's volume or needing extra devices.
6. Mobile Phone Case with Integrated Sound Amplification Chamber and Horn-Shaped Aperture
LIU QIAN, 2023
Mobile phone case with amplified sound. The case has a sound amplification chamber inside the bottom. The bottom of the case has speakers and a sound amplification hole. The phone speaker projects sound into the amplification chamber which concentrates and amplifies it. A horn-shaped amplification hole reflects some sound back to further amplify it. This allows sound from the phone speaker to be amplified without covering the amplification hole when holding the phone.
7. Mobile Device Stand with V-Shaped Base and Angled Acoustic Enhancement Panel
Z West Essentials LLC, 2023
A stand for mobile devices like smartphones that enables hands-free viewing at an angle while also enhancing the audio output without requiring external speakers or power sources. The stand has a V-shaped base with one leg serving as a support surface for the device's back. The other leg has an angled acoustic enhancement panel that reflects sound forward. This passively amplifies the device's internal speakers without electronics or batteries. The stand can also have a holder for a removable battery pack or solar charging cell.
8. Mobile Device Case with Acoustic Baffles and Horn Structures for Sound Amplification and Microphone Sensitivity Enhancement
John F. Ott, 2022
A case for mobile devices that amplifies the sound output from the device's speakers and improves microphone sensitivity. The case has baffles and horns that enhance acoustics when the device is inside. The speaker baffle has a tapered opening that expands like a horn to amplify sound. The microphone baffle compresses sound waves to boost sensitivity. The case also has a stand and clip.
9. Protective Case with Multi-Channel Sound Direction System for Electronic Devices
CATALYST LIFESTYLE LIMITED, 2022
Protective case for electronic devices with sound-directing features to reduce interference between speakers and microphones when the device is in the case. The case has multiple sound channels that direct sound in different directions. This prevents speaker sound from blocking the microphone or vice versa when the device is inserted. The channels can have non-linear paths and offset openings to separate speaker and microphone sound paths.
10. Protective Cell Phone Case with Concave Copper Shield and Sound Amplification Features
William James Scott, 2022
A protective cell phone case is designed to redirect radiation away from the user while amplifying sound and shielding radio signals for privacy. The case has a hinged front plate with slots and a lip to fit over the phone, a copper shield with sound openings, and a back plate with a camera slot. The copper shield is concave to redirect radiation away from the user. The case also has octagonal notches and dense wood material for enhanced sound amplification.
11. Mobile Phone Case with Integrated Sound Amplification Structure and Protective Internal Framework
TIANJIN YINGHAO ELECTRONIC CO LTD, 2021
Mobile phone case with amplifying speaker functionality to improve sound output from the device. The case has a speaker hole on one side of the bottom, an internal protective structure at each end, a middle support, and an amplification structure on the bottom side. This design allows better sound amplification compared to regular cases that can muffle audio. The amplification structure enhances sound transmission from the phone speaker through the case.
12. Mobile Phone Case with Integrated Amplified Speaker and Honeycomb Heat Sink
SHENZHEN HUAYIMING INVEST DEVELOPMENT CO LTD, SHENZHEN HUAYIMING INVESTMENT DEVELOPMENT CO LTD, 2021
A mobile phone case with a built-in amplified speaker that provides better sound quality without the need for external speakers or bulky cases. The case has a speaker, amplifier, and controls integrated into the case itself. It has a speaker slot on the bottom left, a mounting slot, and a charging slot in the middle bottom. The speaker is protected by a ring with a honeycomb heat sink. The amplifier and controls are inside the case. Keys for power and volume are on the left and right sides. The case also has cutouts for the camera, flash, and connectors.
13. Mobile Phone Case with Stepped Sound Turning Holes and Dust Prevention Features
SHEN XIAODONG, 2021
Mobile phone case with improved speaker audio quality and dust prevention. The case has a frame around the inside cavity that contains the phone. The frame has multiple stepped sound turning holes. Inside the frame, there are corresponding stepped parts. When a phone speaker vibrates, sound waves hit the turning holes and step edges. This creates a resonance effect that amplifies the audio. The stepped parts prevent dust from entering the holes while still allowing sound. The holes are arranged in rows and have transitions. The bottom case has protrusions that contact the step edges.
14. Mobile Phone with Dual-Chamber Phase-Shifted Audio System for Directed Sound Emission
USOUND GMBH, 2021
Mobile phone with an integrated audio system that reduces environmental noise during calls. The phone has a touchscreen on the front and an audio system inside the housing. The audio system has two hollow spaces separated by a loudspeaker. Sound is emitted to the user's ear through a front opening and away from the ear through a rear opening. The sound waves from the front and rear openings are phase-shifted, so when the phone is used, the sound is mostly directed to the user's ear instead of leaking out from the rear. This avoids covering the front opening with the ear during calls like a headphone. The rear opening reduces the environmental noise picked up by the microphone.
15. Smartphone Case with Integrated Bluetooth Speaker and Microphone Amplification System
SONG JI HOON, 2020
Smartphone case with built-in Bluetooth speaker and microphone amplification that protects the phone from drops and scratches while adding audio functionality. The case has a speaker unit, microphone unit, and Bluetooth module inside. It charges separately from the phone using an internal battery. This allows using the case speaker and charging simultaneously without separating the phone. The speaker can output sound from the phone or amplify the microphone.
16. Mobile Phone Case with Internal Acoustic Cavities for Directed Audio Output and Input
LI XIANGZHONG, 2020
A mobile phone case that enhances speaker output and microphone input sound by guiding the speaker and microphone audio through internal cavities to reduce dispersion and improve volume and clarity. The case has a front-facing opening in the bottom part that directs speaker audio towards the user instead of dispersing from the bottom. It also connects the speaker and microphone holes to internal cavities that guide the audio to the front opening. This reduces dispersion and improves volume and clarity compared to traditional cases with speakers and mics in the bottom.
17. Protective Case with Sound-Directing Aperture for Enhanced Microphone Access
SHENZHEN KANGCHENGTAI IND CO LTD, SHENZHEN KANGCHENGTAI INDUSTRIAL CO LTD, 2020
Mobile phone protective case and assembly that improves call quality by more efficiently transmitting the user's voice to the microphone through a specially designed sound hole. The case has a bottom plate and frame that enclose a compartment for the phone. The frame has a turning hole that connects to the compartment and penetrates the frame. This allows sound to enter the hole and guide it into the phone's microphone. It avoids the issue of parallel speaker holes in prior cases where sound can't reach the mic well. The assembly uses the case with the improved call quality.
18. Mobile Phone Case with Integrated Sound Amplification Channels and Stand Mechanism
SHENZHEN INTERACTIVE SPACE TIME TECH CO LTD, SHENZHEN INTERACTIVE SPACE-TIME TECHNOLOGY CO LTD, 2020
Mobile phone case with amplified speaker sound and stand capability. The case has a bottom plate with recessed speaker openings. Sound channels guide the speaker sound through the case to two side-mounted outlets. This amplifies and disperses the sound. The bottom plate also has camera and stand features. The case has partitions, baffles, and notches to guide the sound flow.
19. Collapsible Phone Case with Integrated Extendable Speaker Assembly
NANJING INST IND TECH, NANJING INSTITUTE OF INDUSTRY TECHNOLOGY, 2020
A collapsible phone case with integrated speaker that extends to amplify sound when needed but collapses for compactness when not in use. The speaker is housed below the phone's speaker opening. It consists of a rotating support plate, a rebound plate, a sliding plate, and a spring. The support plate attaches to the case back and has an upper and lower section. The lower section has a recess with sliding grooves for the sliding plate. The sliding plate covers the recess and has an upper section. It can slide into the recess when collapsed. The rebound plate attaches to the sliding plate and bounces sound back towards the user's face when extended. The spring biases the sliding plate in the collapsed position.
20. Mobile Phone Case with Integrated Resonant Chamber for Sound Amplification
SHENZHEN INTERACTIVE SPACE TIME TECHNOLOGY CO LTD, SHENZHEN INTERACTIVE SPACE-TIME TECHNOLOGY CO LTD, 2019
Mobile phone case with built-in sound amplification. The case has a hollow space around the phone's speaker that amplifies the sound. It also protects and decorates the phone like a regular case. The amplification is achieved by enclosing the speaker and having a resonant chamber in the case to amplify the sound.
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The sound amplification techniques shown by the patents featured here range from passive designs that use resonating chambers and channels to integrated speaker systems and removable accessories. Even more functions like privacy protection and noise reduction are covered in some circumstances