EP1757163B1 - Condenser microphone - Google Patents

Abstract

A microphone has a microphone capsule housing, a diaphragm, an electrode, and an insulating part which is arranged between the diaphragm and the electrode in the microphone capsule housing. The insulating part has a spacer ring.

Description

The present invention relates to a microphone and an isolation part for a microphone.

In microphones usually microphone capsules are provided which may have an electrode and a membrane. In this case, however, the electrode must be isolated from the membrane. Furthermore, a defined distance between the membrane and the electrode is desirable. Conventionally, an insulating part and a separate spacer ring are provided for this purpose, which are both arranged correspondingly between the electrode and the membrane in the microphone capsule. The required spacer ring is typically punched from a film, but this does not ensure proper cleaning of the spacer rings, since spacer rings adhere to each other due to the cleaning liquid, so that dirt residues, among other things, can not flow off as desired.

As state of the art, reference is made to the documents in this case DE 33 25 966 A1 and JP 2001008293 ,

It is therefore an object of the present invention to provide a microphone with a microphone capsule, which ensures proper operation and improved cleaning of all components.

This object is achieved by a microphone according to claim 1.

The invention is based on the idea to manufacture an insulating part and a spacer ring in a microphone capsule as a single part by, for example, the spacer ring is molded onto the insulating ring.

Thus, a microphone with a microphone capsule housing, a membrane, an electrode and an insulating part is provided, which is arranged between the membrane and the electrode in the microphone capsule housing, wherein the insulating part has a spacer ring.

Due to the design of the insulating part and the spacer ring as a single element or part only one element instead of two elements must be inserted into the microphone capsule, resulting in a more effective manufacturing process. The cleaning of the parts is also improved because sticking together due to the cleaning liquid is avoided.

According to one aspect of the present invention, the spacer ring is molded onto the insulating member. This allows a cost effective and effective production of the resulting combination part.

Further aspects of the present invention are the subject of the subclaims.

Figur 1

zeigt eine Draufsicht auf ein Isolationsteil mit Abstandsring,

Figur 2

zeigt eine Schnittansicht entlang des Schnittes A-A des Isolationsteiles von Figur 1, und

Figur 3

zeigt eine vergrößerte Schnittansicht Z der Schnittansicht von Figur 2.

• Figur 1 zeigt eine Draufsicht auf einen Isolierring 1 zur Isolation einer Membran von einer Elektrode in einem Mikrofonkapselgehäuse. Am äußeren Rand des Isolierringes ist ein Abstandsring 2 vorgesehen. Dieser Abstandsring 2 dient dazu, einen definierten Abstand zwischen der Membran und der Elektrode vorzusehen. Der Abstandsring 2 wird dabei in einem Spritzgussverfahren an dem Isolierring 1 angespritzt. Hierbei kann es sich bei dem Spritzgussverfahren um ein Ein- oder Zweikomponenten-Spritzgussverfahren handeln. Wenn der Abstandsring 2 aus dem gleichen Material wie der Isolierring 1 gefertigt werden soll, kann ein Einkomponenten-Spritzgussverfahren verwendet werden. Wenn jedoch der Abstandsring 2 aus einem anderen Material als der Isolierring 1 gefertigt werden soll, so kann ein Zweikomponenten-Spritzgussverfahren verwendet werden.
• Figur 2 zeigt eine Schnittansicht entlang des Schnittes A-A des Isolierringes von Figur 1. Hier ist deutlich zu sehen, dass der Abstandsring 2 eine größere Dicke aufweist als der Isolierring 1.
• Figur 3 zeigt eine Teil-Schnittansicht Z der Schnittansicht von Figur 2. Hierbei ist die Ausgestaltung bzw. der Querschnitt des Abstandsringes detaillierter gezeigt. Der Abstandsring 2 weist ein erstes Ende 2c auf, welches eine Abschrägung von vorzugsweise 45° aufweist. Ferner weist der Abstandsring 2 ein weiteres Ende 2a auf, welches zum Inneren des Abstandsringes hin weist.

The invention will be explained in more detail with reference to the accompanying drawings.

FIG. 1

shows a plan view of an insulating part with spacer ring,

FIG. 2

shows a sectional view along the section AA of the insulating part of FIG. 1 , and

FIG. 3

shows an enlarged sectional view Z of the sectional view of FIG. 2 ,

• FIG. 1 shows a plan view of an insulating ring 1 for isolating a membrane from an electrode in a microphone capsule housing. At the outer edge of the insulating ring, a spacer ring 2 is provided. This spacer ring 2 serves to provide a defined distance between the membrane and the electrode. The spacer ring 2 is molded onto the insulating ring 1 in an injection molding process. In this case, the injection molding process can be a one- or two-component injection molding process. When the spacer ring 2 is to be made of the same material as the insulating ring 1, a one-component injection molding method can be used. However, if the spacer ring 2 is to be made of a different material than the insulating ring 1, then a two-component injection molding process can be used.
• FIG. 2 shows a sectional view along the section AA of the insulating ring of FIG. 1 , Here it can clearly be seen that the spacer ring 2 has a greater thickness than the insulating ring. 1
• FIG. 3 shows a partial sectional view Z of the sectional view of FIG. 2 , Here, the configuration and the cross section of the spacer ring is shown in more detail. The spacer ring 2 has a first end 2c, which has a bevel of preferably 45 °. Furthermore, the spacer ring 2 has a further end 2a, which points towards the interior of the spacer ring.

By injecting the spacer ring 2 to the insulating ring 1, a new element is produced, which must be introduced for mounting in the microphone capsule. This is advantageous because now no longer two parts, but only one part to ensure the insulation and the defined distance between the membrane and the electrode in the microphone capsule is needed. Thus, an automatic stacking of the insulating ring 1 can be done with the spacer ring 2 in a microphone capsule housing. Thus, both an automatic and a manual stacking can be considerably simplified and thus the corresponding costs can be reduced.

The spacer ring may for example have a thickness of 30 microns. However, this thickness may vary according to the desired application and the microphone capsule.

Claims (3)

1. An isolation part (1) for a microphone for isolation of a diaphragm and an electrode in a microphone capsule housing of the microphone, having
   an isolation ring and
   a spacer ring (2), wherein the isolation part is configured for arrangement between the diaphragm and the electrode,
   characterised in that the spacer ring (2) is injection-moulded onto the isolation ring (1).
2. An isolation part (1) according to claim 1, wherein the spacer ring has a greater thickness than that of the isolation ring.
3. A microphone having
   a microphone capsule housing,
   a diaphragm,
   an electrode, and
   an isolation part (1) according to claim 1 or 2.

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