Vibrating diaphragm of sound-producing apparatus and sound-producing apparatus

Patent metadata

Field	Value
Publication number	US-12163000-B2
Application number	US-201917767745-A
Country	US
Kind code	B2
Filing date	Dec 25, 2019
Priority date	Oct 31, 2019
Publication date	Dec 10, 2024
Grant date	Dec 10, 2024

Abstract

Disclosed are a vibrating diaphragm of a sound-producing apparatus and the sound-producing apparatus. The vibrating diaphragm includes a polyurethane rubber film layer and the polyurethane rubber film layer includes a block polymer formed by soft segment portions and hard segment portions that are arranged alternately, wherein each of the soft segment portions includes polyhydric alcohol and each of the hard segment portions includes isocyanate and a chain extender, and the polyurethane rubber is represented by a structural formula as follows:

wherein R is the chain extender, R 1 is polyhydric alcohol and n is a natural number. (FIG. 6 ).

First claim

The invention claimed is:

1. A vibrating diaphragm of a sound-producing apparatus, wherein the vibrating diaphragm comprises a polyurethane rubber film layer which comprises a block polymer including alternately arranged soft segment portions and hard segment portions, wherein each of the soft segment portions comprises polyhydric alcohol and each of the hard segment portions comprises isocyanate and a chain extender, wherein the polyurethane rubber is represented by a structural formula as follows:

and wherein R is the chain extender, R 1 is polyhydric alcohol and n is a natural number.

2. The vibrating diaphragm of claim 1 of the sound-producing apparatus, wherein the isocyanate is selected from the group consisting of diisocyanate and polyisocyanate.

3. The vibrating diaphragm of claim 1 of the sound-producing apparatus, wherein the isocyanate is selected from the group consisting of toluene diisocyanate (TDI), methylene diphenyl diisocyanate (MDI), hexamethylene diisocyanate (HDI), naphthalene diimide (NDI), phenylene diisocyanate (PPDI), isophorone diisocyanate (IPDI), xylylene diisocyanate (XDI), polymethylene polyphenyl isocyanate (PADI), hexahydrotoluylene diisocyanate (HTDI) and hexamethylene diisocyanate (HMDI).

4. The vibrating diaphragm of claim 1 of the sound-producing apparatus, wherein the chain extender is selected from the group consisting of an alcohol compound and an amine compound.

5. The vibrating diaphragm of claim 1 of the sound-producing apparatus, wherein the chain extender is selected from the group consisting of ethylene glycol, diethylene glycol, 1,2-propylene glycol, dipropylene glycol, 1,4-butanediol, 1,6-hexanediol and trimethylolpropane.

6. The vibrating diaphragm of claim 1 of the sound-producing apparatus, wherein the soft segment portion is selected from the group consisting of polyester polyol, polyether polyol, polybutadiene polyol, castor oil polyol, tetrahydrofuran-propylene oxide polyol and epoxy resin modified polyol.

7. The vibrating diaphragm of claim 1 of the sound-producing apparatus, wherein the polyurethane rubber further comprises a vulcanizer which is selected from the group consisting of sulfur, peroxide and isocyanate.

8. The vibrating diaphragm of claim 1 of the sound-producing apparatus, wherein the polyurethane rubber further comprises a reinforcing agent selected from the group consisting of carbon black, silicon dioxide, calcium carbonate, barium sulfate, organic montmorillonite and unsaturated metal carboxylates.

9. The vibrating diaphragm of claim 1 of the sound-producing apparatus, wherein the polyurethane rubber further comprises an antiaging agent selected from the group consisting of antiaging agent N-445, antiaging agent 246, antiaging agent 4010, antiaging agent SP, antiaging agent RD, antiaging agent ODA, antiaging agent OD and antiaging agent WH-02.

10. The vibrating diaphragm of claim 1 of the sound-producing apparatus, wherein a hardness of the polyurethane rubber is 20 A to 90 A and a room temperature storage modulus is 0.5 MPa to 70 MPa.

11. The vibrating diaphragm of claim 1 of the sound-producing apparatus, wherein a brittle temperature of the polyurethane rubber ranges from −70° C. to −20° C., and a loss factor of the polyurethane rubber is greater than or equal to 0.06.

12. The vibrating diaphragm of claim 1 of the sound-producing apparatus, wherein a thickness of the vibrating diaphragm is 20 μm to 50 μm and an elongation at break thereof is greater than or equal to 100%.

13. The vibrating diaphragm of claim 1 , wherein a mass content of the hard segment portions in the polyurethane rubber is 2% to 50%.

14. A sound-producing apparatus, comprising a magnetic circuit system and a vibrating system matched with the magnetic circuit system, the vibrating system comprising the vibrating diaphragm of claim 1 .

Assignees

• Goertek Inc

Inventors

• Wang Shuqiang
• Ling Fengguang
• Li Chun
• Liu Chunfa

Classifications

• H04R2307/025

  Diaphragms comprising polymeric materials · CPC title

• H04R31/003

  for diaphragms or their outer suspension · CPC title

• H04R9/06

  Loudspeakers · CPC title

• H04R9/025

  Magnetic circuit · CPC title

• H04R7/10

  comprising superposed layers in contact · CPC title