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Coil-equipped moving magnet actuator for panel audio speaker

A technology for audio speakers and actuators, which is applied in the direction of fixing speaker transducers, sensors, and planar diaphragms, and can solve problems such as increasing inductance and electrical impedance, reducing sound output, and limiting maximum force, so as to improve efficiency and improve Robustness, effect of improving mechanical strength

Active Publication Date: 2021-05-28
GOOGLE LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Conventional panel audio speaker magnet systems can have performance limitations due to the increased inductance and electrical impedance of soft magnetic materials with increasing frequency
This increase in inductance can have disadvantages, including reduced sound output at high frequencies
[0004] The temperature and resistance of the coil conductors in moving magnet actuators also tend to increase with current, which causes power compression and limits the maximum force produced by the actuator

Method used

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  • Coil-equipped moving magnet actuator for panel audio speaker
  • Coil-equipped moving magnet actuator for panel audio speaker
  • Coil-equipped moving magnet actuator for panel audio speaker

Examples

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Embodiment Construction

[0028] refer to figure 1 , the mobile device 100 includes an equipment rack 102 and a touch display panel 104 that includes a flat panel display (eg, an OLED or LCD display panel) that integrates the display panel 104 and a back surface mechanically coupled to the panel 104 The actuator 110 consists of panel audio speakers. Mobile device (eg, smartphone) 100 interacts with a user in various ways, including by displaying images, receiving touch input via touch panel display 104, and producing audio and haptic output. Typically, as part of a panel audio speaker, a vibrating panel produces sound waves audible to humans, eg in the range of 20Hz to 20kHz. In addition to generating sound output, mobile device 100 may also generate haptic output via display panel 104 . For example, the haptic output may correspond to vibrations in the range of 150 Hz to 300 Hz.

[0029] Typically, a mobile device like mobile device 100 has a depth (along the z-axis) of about 10 mm or less, a width...

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PUM

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Abstract

A panel audio speaker includes a panel and an actuator rigidly coupled to a surface of the panel. The actuator includes: a magnet assembly including a permanent magnet disposed within a cup, wherein there is an air gap between a sidewall of the cup and the permanent magnet; and, a coil rigidly connected to the panel, the coil including a length of conductive wire wound therein and extending along an axis. The coil includes a first region having a first winding density and a second region having a second winding density higher than the first winding density, the second region extending at least partially into the air gap of the magnet assembly.

Description

technical field [0001] The present disclosure relates generally to moving magnet actuators, and more particularly to actuators for panel audio speakers. Background technique [0002] Many conventional speakers produce sound by inducing piston-like motion in the diaphragm. In contrast, panel audio speakers such as distributed mode speakers (DML) operate by inducing a uniformly distributed vibration mode in the panel via electroacoustic actuators. Typically, the actuators are moving magnet actuators or piezoelectric actuators. [0003] Conventional panel audio speaker magnet systems may have performance limitations due to the increased inductance and electrical impedance of soft magnetic materials with increasing frequency. This increase in inductance can have disadvantages, including reducing sound output at high frequencies. [0004] The temperature and resistance of the coil conductors in moving magnet actuators also tend to increase with increasing current, which can ca...

Claims

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Application Information

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IPC IPC(8): H04R7/04H04R9/04H04R9/06
CPCH04R9/066H04R9/046H04R7/045H04R2499/11H04R9/045H04R1/025H04R7/04H04R9/025H04R9/04H04R9/06
Inventor 马克·威廉·斯塔恩斯詹姆斯·伊斯特
Owner GOOGLE LLC
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