Slim Microspeaker

Patent metadata

Field	Value
Publication number	US-2016173990-A1
Application number	US-201514968295-A
Country	US
Kind code	A1
Filing date	Dec 14, 2015
Priority date	Dec 15, 2014
Publication date	Jun 16, 2016
Grant date	—

Abstract

A microspeaker includes a frame, magnetic circuit, voice coil configured to generate vibration by mutual electromagnetic force with the magnetic circuit, vibration plate configured to vibrate together according to the vibration of the voice coil to generate a sound, and suspension configured to guide a vibration direction of the vibration plate and voice coil. The suspension has a central portion attached to the voice coil, an annular outer circumferential portion formed to be spaced apart from the central portion by a predetermined interval, and a connection portion connecting the central and outer circumferential portions and configured to perform a damping function. The central portion has an outer end having the same height as the connection and outer circumferential portions, an inner end positioned to be higher than the outer end, and a step portion connecting the outer end and inner end. The voice coil is attached to the inner end.

First claim

What is claimed is:

1 . A slim microspeaker, comprising:
a frame; a magnetic circuit; a voice coil configured to generate vibration by mutual electromagnetic force with the magnetic circuit; a vibration plate configured to vibrate together according to the vibration of the voice coil to generate a sound; and a suspension configured to guide a vibration direction of the vibration plate and the voice coil and having a central portion to which the voice coil is attached, an annular outer circumferential portion formed to be spaced apart from the central portion by a predetermined interval, and a connection portion connecting the central portion and the outer circumferential portion and configured to perform a damping function, wherein the central portion has an outer end having the same height as the connection portion and the outer circumferential portion, an inner end positioned to be higher than the outer end, and a step portion connecting the outer end and the inner end, wherein the voice coil is attached to the inner end.

2 . The slim microspeaker of claim 1 , wherein the central portion of the suspension has a hollow portion, and wherein the vibration plate includes a central vibration plate attached to an upper surface of a high portion of the central portion of the suspension and a side vibration plate having an inner circumferential portion attached to a lower surface of the central portion, an outer circumferential portion mounted on the frame, and a dome portion positioned between the inner circumferential portion and the outer circumferential portion and protruding downwardly.

3 . The slim microspeaker of claim 2 , wherein the inner circumferential portion of the side vibration plate is attached to the outer end and the step portion of the central portion of the suspension.

4 . The slim microspeaker of claim 2 , wherein the inner circumferential portion of the side vibration plate is attached to the outer end, the step portion, and the inner end of the central portion of the suspension, and wherein the voice coil is attached to a lower surface of the side vibration plate.

5 . The slim microspeaker of claim 1 , wherein the inner end of the central portion of the suspension is provided as a surface without a hollow so as to serve as a central vibration plate, and wherein the vibration plate includes a side vibration plate having an inner circumferential portion attached to a lower surface of the central portion, an outer circumferential portion mounted on the frame, and a dome portion positioned between the inner circumferential portion and the outer circumferential portion and protruding downwardly.

6 . The slim microspeaker of claim 1 , wherein the vibration plate includes a side vibration plate having an inner circumferential portion attached to an upper surface of the central portion, an outer circumferential portion mounted on the frame, and a dome portion positioned between the inner circumferential portion and the outer circumferential portion and protruding downwardly.

7 . The slim microspeaker of claim 6 , wherein the inner circumferential portion has a shape corresponding to the inner end, the outer end, and the step portion of the suspension, and is attached to an upper surface of the suspension.

8 . The slim microspeaker of claim 7 , wherein the inner circumferential portion is provided as a surface without a hollow.

9 . The slim microspeaker of claim 8 , wherein the inner end of the suspension is provided as a surface without a hollow.

10 . The slim microspeaker of claim 8 , wherein the vibration plate further includes a central vibration plate attached to an upper surface of the inner circumferential portion of the side vibration plate.

11 . The slim microspeaker of claim 1 , wherein the central portion has a vibration plate attachment portion provided at an inner side of the inner end thereof to which the vibration plate is attached, and wherein a position of the vibration plate attachment portion is lower than that of the inner end.

12 . The slim microspeaker of claim 11 , wherein the central vibration plate is attached to an upper surface of the vibration plate attachment portion.

13 . The slim microspeaker of in claim 1 , wherein the central portion has a vibration plate attachment portion extending to an inner side and having the same height as the inner end, and wherein the vibration plate is attached to a lower surface of the vibration plate attachment portion.

14 . The slim microspeaker of claim 13 , wherein a width of the inner end is 0.35 mm or greater.

15 . The slim microspeaker of claim 13 , wherein a width of the vibration plate attachment portion ranges from 0.2 mm to 2.0 mm.

16 . The slim microspeaker of claim 1 , wherein the suspension has a conductive pattern configured to transmit an electric signal to the voice coil attached from the outer circumferential portion thereof to the central portion thereof, and wherein the step portion thereof has a metal dummy pattern configured to prevent distortion of the suspension and biased vibration.

17 . The slim microspeaker of claim 16 , wherein a width of the metal dummy pattern extends up to a portion of the outer end and up to a portion of the inner end.

18 . The slim microspeaker of claim 16 , wherein a width of the metal dummy pattern extends from the step portion up to a portion of the outer end.

19 . The slim microspeaker of claim 16 , wherein a width of the metal dummy pattern extends from the step portion up to a portion of the inner end.

20 . The slim microspeaker of claim 16 , wherein the metal dummy pattern is connected to the conductive pattern.

21 . The slim microspeaker of claim 16 , wherein the metal dummy pattern is provided to be separated from the conductive pattern.

22 . The slim microspeaker of claim 16 , wherein the metal dummy pattern extends up to a portion of the connection portion.

Assignees

• Em Tech Co Ltd

Inventors

• Park Kil Dong
• Nam Seul Ki
• Kim Ji Hoon
• Kim Min Chang

Classifications

• H04R1/06 Primary

  Arranging circuit leads; Relieving strain on circuit leads · CPC title

• H04R7/18

  at the periphery · CPC title

• H04R9/043

  Inner suspension or damper, e.g. spider (outer suspension or surround H04R7/16) · CPC title

• H04R7/04

  Plane diaphragms · CPC title

• H04R7/127

  dome-shaped · CPC title