FIELD OF THE DISCLOSURE
The present disclosure relates generally to ear-worn hearing devices and more particularly to ear-worn hearing devices comprising multiple acoustic transducers, as well as acoustic transducer assemblies configured for hearing devices with space constraints.
BACKGROUND
Some ear-worn hearing devices comprise an in-ear component that extends at least partially into the user's ear canal. One such hearing device is a receiver-in-canal (RIC) type behind-the-ear (BTE) hearing aid comprising a RIC unit configured for at least partial insertion into the user's ear canal. The RIC unit is connectable to a BTE unit that sits behind a user's ear (pinna) and transmits electrical audio signals to the RIC unit. The RIC unit generally comprises an acoustic transducer in the form of a balanced armature receiver (also referred to herein as a “receiver”) integrated with an electrical cable assembly comprising a connector that plugs into the BTE unit. The BTE unit contains one or more microphones, batteries and electrical circuits for converting sensed environmental sounds into amplified electrical audio signals transmitted to the receiver in the RIC unit. The electrical circuit can also perform noise suppression and sound localization, among other audio signal processing functions. RIC units and other ear-worn hearing devices produce sound in a relatively narrow frequency range, often at higher frequencies of the audio spectrum, due in part to the characteristic frequency response of the receiver. Space constraints in the hearing device can also limit the number of acoustic transducers that can be integrated with the hearing device. Such space constraints can result from the need to locate the hearing device at least partially in the user's ear canal and from the trend to provide increased functionality in increasingly small hearing devices. Thus there is an ongoing need for improvements in ear-worn hearing devices.
BRIEF DESCRIPTION OF THE DRAWINGS
The objects, features and advantages of the present disclosure will become more fully apparent from the following detailed description and the appended claims considered in conjunction with the accompanying drawings. The drawings depict only representative embodiments and are therefore not considered to limit the scope of the disclosure.
FIG. 1 is a representative ear-worn hearing device including a cable assembly.
FIG. 2 is another representative ear-worn hearing device.
FIG. 3 is a sectional view of a prior art balanced armature receiver.
FIG. 4 is a schematic diagram of a representative transducer subassembly.
FIG. 5 is a schematic diagram of another representative transducer subassembly.
FIG. 6 is a schematic diagram of representative transducer subassembly connected to conductors.
FIG. 7 is a schematic diagram of representative transducer subassembly connected to a flex circuit.
Those of ordinary skill in the art will appreciate that the figures are illustrated for simplicity and clarity and therefore may not be drawn to scale and may not include well-known features, that the order of occurrence of actions or steps may be different than the order described or that some or all of the actions or steps may be performed concurrently unless specified otherwise, and that the terms and expressions used herein have meanings understood by those of ordinary skill in the art except where different meanings are attributed to them herein.
DETAILED DESCRIPTION
The disclosure relates generally to ear-worn hearing devices and more particularly to ear-worn hearing devices comprising multiple acoustic transducers, as wells as to acoustic transducer assemblies configured for hearing devices with space constraints. Representative ear-worn hearing devices include, but are not limited to, Receiver-in-Canal (RIC), In-the-Ear (ITE), In-the Canal (ITC), Completely-in-the Canal (CIC), and Speaker-in-Concha (SIC) devices, among others. In the present specification, “ear-worn hearing device” means a hearing device (also referred to herein as a “unit”) that is worn in the ear canal, partially in the ear canal, or on the ear facing the ear canal.
The ear-worn hearing device generally comprises a hearing device housing including a sound passage terminating at a sound port located to face the user's ear canal during use. The hearing device housing can be a substantially enclosed housing that fully contains multiple acoustic transducers. A substantially enclosed hearing device housing includes a sound port and possibly microphone ports and vents. Alternatively, the housing can enclose fewer than all transducers. For example, the housing can be a housing portion that caps as little as an end portion of one of the acoustic transducers, wherein the remaining acoustic transducers extend outside of the hearing device housing.
In FIG. 1, the hearing device 100 is configured as RIC unit comprising a RIC housing 110 defining a sound passage 112 terminating at a sound port 114 on an end portion 116 of the RIC housing. The housing end portion 116 is configured to support a removable ear-dome 120 and to protrude toward a user's ear canal during use. The ear-dome can be formed of a silicone or other pliable biocompatible material that is at least partially insertable into the user's ear canal. In ITE, ITC and other ear-worn hearing devices however the hearing device housing is configured for wear without an ear-dome. These and other ear-worn hearing devices may include a housing sized or custom-molded to fit the unique anatomy of the user's ear.
In FIG. 1, the RIC unit comprises a substantially enclosed RIC housing 110. In other implementations, RIC housing can have an open end opposite the end portion 116, wherein a portion of one or more acoustic receivers are exposed. Other ear-worn hearing devices also comprise a substantially enclosed hearing device housing. Representative ear-worn hearing devices comprising a substantially enclosed hearing device housing include, but are not limited to, ITE, ITC, CIC and SIC units, among others.
In FIG. 1, a cable assembly 130 is mechanically coupled to the RIC housing 110. The cable assembly is also mechanically connected or connectable to a BTE unit (not shown) configured for wear on or behind the user's ear. More generally, the cable assembly connects the RIC unit to a base unit that can be worn on some other part of the user's body. The base unit typically comprises one or more batteries, electrical circuits (e.g., an audio signal processor, audio amplifier, etc.), and one or more microphones. The base unit can also comprise a physiological sensor and a wireless transceiver among other components. The cable assembly comprises electrical conductors 132 electrically connecting the acoustic transducers of the RIC unit to the electrical circuit of the base unit as described further herein.
Other ear-worn hearing devices are stand-alone devices devoid of a cable assembly and a base unit. In FIG. 2, a standalone hearing device 200 comprises a hearing device housing 210 resembling an ITC unit. Alternatively, the hearing device housing can be configured as an ITE, CIC and SIC unit, among others. In these and other ear-worn units, multiple transducers 212, 213, batteries 214, electrical circuits 216, microphones 218 and other components are contained within the hearing device housing. The stand-along ear-worn unit can also comprise a physiological sensor and a wireless transceiver among other components.
Generally, the ear-worn hearing device comprises two or more (multiple) multiple acoustic transducers assembled with the hearing device housing individually or as a transducer subassembly. The transducers generally comprises a transducer housing having an electrical terminal and a sound outlet. The multiple transducers are arranged end-to-end along a common lengthwise dimension. The lengthwise configuration permits integration of the multiple acoustic transducer assembly in hearing devices with space constraints dictated by the ear canal and other considerations, wherein such space constraints may not accommodate a side-by-side arrangement of the transducers.
The one or more acoustic transducers can have a cube, or rectangular cuboid, or cylindrical shape, among others, attributed to the transducer housing. Multiple acoustic transducers within a particular ear-worn unit can have the same shape or different shapes. Some transducer comprise a longitudinal dimension between opposite ends. The longitudinal dimension of a rectangular cuboid is between opposite ends separated by the longest dimension of the hearing device housing. The longitudinal dimension of a cylindrical transducer is along its axis of symmetry. Alignment of the longest dimension of the transducers along the common lengthwise dimension of the end-to-end arrangement can minimize the cross-sectional area occupied by the transducers. In other implementations, it is unnecessary to align the longest dimension of the transducers along the lengthwise dimension of the end-to-end arrangement of acoustic transducers.
In some implementations, the multiple acoustic transducers are arranged and mechanically coupled as a subassembly prior to assembly with the hearing device housing of the ear-worn hearing device. The coupling can be direct or indirect. Direct coupling can be achieved by a weld, adhesive, or by fabricating more than one acoustic transducer in a common transducer housing, wherein the first and second transducer housings constitute the common housing. An indirect coupling can be achieved with intermediate structure interconnecting the transducers. In other implementations, the first and second transducers are not coupled prior to assembly with the housing of the ear-worn hearing device. In the latter case, the multiple transducers are arranged end-to-end when assembled with the hearing device housing. In either case, the hearing device housing can be structured with receptacles to accommodate individual transducers or a subassembly of multiple transducers arranged in an end-to-end configuration.
In one implementation, the multiple acoustic transducers are balanced armature receivers. Such receivers are also known in the art as moving iron speakers or receivers. In FIG. 3, a representative balanced armature receiver 300 comprises a transducer housing 310 separated by a diaphragm 320 into a back volume 312 and a front volume 314 coupled to a sound port 302. A motor 330 located in the back volume comprises a coil 332 electromagnetically coupled to an armature 334 having one end fixed to a yoke 336 and a free end 335 balanced between magnets 338 retained by the yoke. The armature is coupled to a movable portion of the diaphragm by a drive rod or other link 340. A magnetic field induced by an electrical audio signal applied to terminal contacts 342 connected to the coil moves the armature and diaphragm. Deflection of the diaphragm emits sound from the sound port 302. In FIG. 3, the armature has a U-shape, but other armatures can have an E-shape or M-shape, among others. Other balanced armature receivers can have different architectures than the representative receiver of FIG. 3. Other acoustic transducers like dynamic speakers can also be arranged in an end-to-end configuration as described herein. One or more dynamic speakers can also be arranged end-to-end with one or more receivers.
In the acoustic transducer subassembly 400 of FIG. 4, a first acoustic transducer comprises a first transducer housing 410 including a first sound outlet 412 coupled to a first front volume 414 of the first transducer housing. The first front volume is partially defined by an end 416 of the first transducer housing. The first sound outlet 412 is located on a transducer housing sidewall that partially defines the first front volume. A second acoustic transducer comprises a second transducer housing 420 including a second sound outlet 422 coupled to a second front volume 424 of the second transducer housing. The second sound outlet is located on an end 426 of the second transducer housing. The end 416 of the first transducer housing 410 is coupled to the end 426 of the second transducer housing, wherein the second sound outlet 422 is acoustically ported into the first front volume 414 and out the first sound outlet 412. The configured, sounds from both the first and second transducers are emitted from the first sound outlet 412. Mechanically coupling the first and second acoustic transducers prior to assembly with the hearing device housing can ensure proper alignment and sealing between the first and second front volumes. Such a coupling can be direct or indirect as described herein.
In the acoustic transducer subassembly 500 of FIG. 5, a first acoustic transducer comprises a first transducer housing 510 including a first sound outlet 512 coupled to a first front volume 514 of the first transducer housing. The first sound outlet 512 is located on a housing sidewall that partially defines the first front volume. Alternatively, the first sound outlet 513 can be located on an end 515 of the first transducer housing. A second acoustic transducer comprises a second transducer housing 520 including a second sound outlet 522 coupled to a second front volume 524 of the second transducer housing. The second sound outlet is located on a transducer housing sidewall that partially defines the second front volume. An end 516 of the first transducer housing 510 is adjacent to an end 526 of the second transducer housing. Thus configured, sounds from both the first and second transducers can be emitted into a sound passage of an ear-worn hearing device as shown in FIGS. 1 and 2. In FIG. 5, sound emitted from sound port 512 and sound port 522 or 523 travels to the sound passage via space in the hearing device housing. Sound emitted from sound port 513 travels more directly to the sound passage. Alternatively, sound emitted from the second transducer 520 can be ported to the first front volume 514 via a conduit (not shown) from the second sound output, whereby sound from both the first and second transducers are emitted from the first sound outlet 512. Mechanically coupling the first and second acoustic transducers can ease integration of the transducer subassembly with the hearing device housing.
In some implementations, each of the multiple acoustic transducers of the acoustic transducer subassembly are electrically connected to one or more conductors connected or connectable to electrical circuits of the ear-worn hearing device. In FIG. 6, first and second transducers 610 and 620 of an acoustic transducer subassembly are connected or connectable to an electrical circuit (not shown in FIG. 6) of the ear-worn hearing device by corresponding conductive wires 602 and 604 connected to terminal contacts 612 and 622 of the corresponding acoustic transducers. More generally, multiple wires can be connected to corresponding terminal contacts of each acoustic transducer. Also, in some implementations, the multiple acoustic transducers can be connected in parallel by the conductors. The conductive wires can be connected to conductors of a cable assembly or to an electrical circuit co-located in the hearing device housing with the acoustic transducers.
In FIG. 7, first and second transducers 710 and 720 of an acoustic transducer subassembly are connected or connectable to an electrical circuit (not shown in FIG. 7) of the ear-worn hearing device by one or more conductors of a flex circuit 730. The flex circuit can be connected (e.g., by soldering) to corresponding terminal contacts of the acoustic transducers. The flex circuit can also comprise one or more contacts 732 connectable to corresponding conductors of a cable assembly of a RIC unit. In FIG. 1, one or more conductors 132 of the cable assembly are electrically connected to corresponding conductors of a flex circuit 134. In some ear-worn hearing devices, components (e.g., integrated circuits . . . ) of an electrical circuit can be connected directly to the flex circuit. More generally, multiple wires can be connected to corresponding terminal contacts of each acoustic transducer. In some implementations, the flex circuit can also connect the multiple acoustic transducers in parallel.
In one implementation, an ear-worn hearing device comprises a housing including a sound passage terminating at a sound port on a portion of the housing configured to protrude toward a user's ear canal. A first acoustic transducer is coupled to the hearing device housing and comprises a first transducer housing having a first sound outlet acoustically coupled to the sound port via the sound passage. A second acoustic transducer comprises a second transducer housing including a second sound outlet acoustically coupled to the sound port via the sound passage. Representative hearing devices are shown schematically in FIGS. 1 and 2.
The first acoustic transducer is arranged end-to-end with the second acoustic transducer, wherein the first acoustic transducer is located between the second acoustic transducer and the sound port of the hearing device housing. In FIG. 1, the first transducer is located between the second transducer 142 and the sound port 114 of the hearing device. In FIG. 2, similarly, a first transducer 212 is located between the second transducer 213 and a sound port 220 of the ear-worn unit 200.
In some implementations, the first acoustic transducer comprises a first audio band frequency response, and the second acoustic transducer comprises a second audio band frequency response, wherein predominant frequencies of the first audio band frequency response are higher than predominant frequencies of the second audio band frequency response. In FIG. 1, for example, the first transducer 140 can have a higher frequency response than the second transducer 142. Locating the transducer with the highest frequency response nearest the sound port of the hearing device and locating the transducer with the lowest frequency response farthest from the sound port may provide an optimal acoustic output. But the arrangement of the higher and lower frequency relative to the sound port may different on other implementations.
In FIG. 1, the first sound outlet 144 of the first transducer 140 is coupled to the sound port 114 via space in the hearing device housing 110 and the sound passage 112. The second sound outlet (not shown) is located on an end 141 of the second transducer 142 facing the first transducer, wherein the second sound outlet is acoustically coupled to the front volume of the first transducer 140, as shown in FIG. 4 and described herein. Thus configured, the second sound outlet of the second transducer 142 is acoustically coupled to the sound port 114 via the first front volume of the first transducer. In FIG. 2, the first sound outlet (not shown) is located on an end of the first transducer 212 proximate the sound port and is directly coupled to the sound port 220 via the sound passage 112. In FIG. 5, such a sound outlet is shown at 513 and described hereinabove. In FIG. 2, the second sound outlet 215 of the second transducer 213 is acoustically coupled to transducer 140 sound port 220 via space 217 in the hearing device housing 210 and the sound passage.
While the disclosure and what is presently considered to be the best mode thereof has been described in a manner establishing possession and enabling those of ordinary skill in the art to make and use the same, it will be understood and appreciated that there are many equivalents to the representative embodiments described herein and that myriad modifications and variations may be made thereto without departing from the scope and spirit of the invention, which is to be limited not by the embodiments described but by the appended claims and their equivalents.
Patent Application
20240147137
