网罩、扬声器及车载警示装置

Abstract

本实用新型公开了一种网罩、扬声器及车载警示装置。网罩包括位于扬声器的振膜的外侧的主体及环绕主体部的固定边，主体具有朝向扬声器外侧的正面和朝向振膜的背面，网罩配置为和振膜之间形成共振压缩腔，其中背面的局部的形状配置为和正对局部的振膜部分的形状一致；主体上设有气流通道，气流通道自主体的正面贯穿至背面，气流通道具有设于正面上的气流入口和设于背面上的气流出口；自背面观察，气流入口被背面全部或局部遮挡；自正面观察，气流出口被正面全部或局部遮挡。该网罩在扬声器浸泡至水中后可以顺利将水排出，又能够满足扬声器的高声压级要求，应用该网罩的车载警示装置既能快速排水又能满足鸣笛喇叭要求。

Claims

1. A mesh cover of a speaker, the mesh cover comprising a main body located outside of a diaphragm of the speaker and a fixed rim surrounding the main body, characterized in that, The main body has a front facing outwards from the speaker and a back facing the diaphragm, the mesh is configured to form a resonant compression cavity between itself and the diaphragm, wherein the shape of a portion of the back is configured to match the shape of the portion of the diaphragm facing that portion; The main body is provided with an airflow channel that extends from the front to the back of the main body. The airflow channel has an airflow inlet on the front and an airflow outlet on the back. When viewed from the back, the airflow inlet is completely or partially blocked by the back. When viewed from the front, the airflow outlet is completely or partially blocked by the front.

2. The screen cage of claim 1, wherein, The airflow channel extends through the main body along the vibration axis of the speaker. The main body includes a first sidewall and a second sidewall disposed opposite to each other, and the airflow channel is formed between the first sidewall and the second sidewall. The main body includes an inlet baffle that extends from a first sidewall at one end of the airflow channel toward a second sidewall. The inlet baffle partially blocks the airflow channel, forming the airflow inlet between the inlet baffle and the second sidewall. The main body includes an outlet baffle that extends from a second sidewall at the other end of the airflow channel toward a first sidewall. The outlet baffle partially blocks the airflow channel, forming the airflow outlet between the inlet baffle and the first sidewall.

3. The screen cage of claim 2, wherein, When viewed along the vibration axis of the loudspeaker, the inlet baffle and the outlet baffle are staggered.

4. The screen cage of claim 2, wherein, Viewed along the vibration axis of the loudspeaker, the edges of the inlet baffle and the outlet baffle have a gap, or the edges of the inlet baffle and the outlet baffle are in contact, or the inlet baffle and the outlet baffle partially overlap.

5. The screen cage of claim 2, wherein, The number of airflow channels is multiple. The inner end of the first sidewall of at least one airflow channel and the inner end of the second sidewall of another adjacent airflow channel are connected by a transverse connecting plate to form a blind groove with an open outer end.

6. The screen of any one of claims 2 to 5, wherein, Viewed along the vibration axis of the loudspeaker, the airflow channel is annular around the vibration axis, with the second sidewall surrounding the first sidewall.

7. The screen cage of claim 6, wherein, The multiple airflow channels are arranged in a concentric ring shape, and the multiple first sidewalls and multiple second sidewalls are staggered; the main body also includes radial reinforcing ribs, which extend along the diameter direction of the main body and connect the first sidewalls and the second sidewalls.

8. The mesh cover according to claim 1, characterized in that, The edge of the main body is provided with multiple airflow slots spaced apart; the back of the main body includes a spherical part and a conical part, the middle of the spherical part is arched upward to match the shape of the spherical top of the diaphragm, the conical part is arranged around the spherical part, the conical part is configured as a truncated cone shape consistent with the shape of the cone part of the speaker diaphragm, the conical part is provided with a groove, the groove opening faces the speaker diaphragm.

9. A loudspeaker, characterized by Includes the mesh cover as described in any one of claims 1 to 8.

10. The loudspeaker of claim 9, wherein, The fixed edge of the mesh cover is fixed to the housing, the mesh cover covers the outside of the diaphragm, the outer edge of the diaphragm is fixed to the housing and / or the fixed edge, and the housing encloses an inner cavity. The conical portion of the diaphragm and the conical surface portion of the back surface of the mesh are parallel to each other, and the spherical top portion of the middle portion of the diaphragm and the spherical surface portion of the middle portion of the mesh are parallel to each other.

11. A vehicle-mounted warning device comprising a loudspeaker for mounting on the exterior of a vehicle, characterised in that, The loudspeaker comprises the mesh as claimed in any one of claims 1 to 8, and is configured to produce a siren sound and / or a warning sound when the vehicle is running at a low speed.

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