U.S. Philips Corporation

Johannes Matheus Kaanders

Cornelis H Van Rijsewijk

Antoon F Smerecnik

A hearing aid includes a duct (10) for transmitting the sound from the receiver (2) to the exterior of the housing (1) of the hearing aid. The duct is formed in a component (9) which is constituted by a body of an elastic damping material and which also serves as the sole suspension means for the receiver (2). The suspension means supports the receiver mainly on that side of the receiver where the sound outlet (12) of the receiver is located. This minimizes the mechanical-acoustic coupling between the receiver and the microphone (3) of the hearing aid.

Hearing aid

A hearing aid to be worn behind the ear and including a pressure-gradient microphone is designed so as to give a defined directional effect. The rear surface of the microphone communicates with the ambient atmosphere by way of an acoustic resistor comprising a block of sintered material. The overall transmission area of this block is less than one half of the effective area of the microphone diaphragm. The block preferably is detachably accommodated in a rubber mount and may comprise sintered bronze pellets or sintered silicon carbide.

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Eindhoven, Netherlands

Johannes Matheus Kaanders