WATER-PROOF AND DUST-PROOF MEMBRANE ASSEMBLY AND APPLICATIONS THEREOF

• US 20110188247A1
• Filed: 07/23/2010
• Published: 08/04/2011
• Est. Priority Date: 02/02/2010
• Status: Active Grant

• Current Assignee: EF-Materials Industries Inc.
• Original Assignee: EF-Materials Industries Inc.
• Inventors: Chen, Sean, HUANG, James, Huang, Radium, Han, Jeff
• Granted Patent: US 10,099,182 B2
• Time in Patent Office: Days
• US Class Current: 362/249.02
• CPC Class Codes: B01D 2239/0654 Support layers
• CPC Class Codes: B01D 2239/1216 Pore size
• CPC Class Codes: B01D 2239/1291 Other parameters
• CPC Class Codes: B01D 2325/02 Details relating to pores or porosity of the membranes
• CPC Class Codes: B01D 2325/022 Asymmetric membranes
• CPC Class Codes: B01D 2325/0283 Pore size
• CPC Class Codes: B01D 2325/04 Characteristic thickness
• CPC Class Codes: B01D 2325/20 Specific permeability or cut-off range
• CPC Class Codes: B01D 2325/38 Hydrophobic membranes
• CPC Class Codes: B01D 39/1692 Other shaped material, e.g. perforated or porous sheets
• CPC Class Codes: B01D 61/32 Controlling or regulating
• CPC Class Codes: B01D 69/02 characterised by their properties
• CPC Class Codes: B01D 69/10 Supported membranes; Membrane supports
• CPC Class Codes: B01D 69/1071 Woven, non-woven or net mesh
• CPC Class Codes: B01D 71/26 Polyalkenes
• CPC Class Codes: B01D 71/261 Polyethylene
• CPC Class Codes: B01D 71/36 Polytetrafluoroethene
• CPC Class Codes: B29K 2105/045 with open cells
• CPC Class Codes: B29L 2031/755 Membranes, diaphragms
• CPC Class Codes: F21S 4/00 Lighting devices or systems using a string or strip of light sources
• CPC Class Codes: H05K 5/03 : Covers

Abstract

Disclosed is a water-proof and dust-proof membrane assembly and applications thereof. The water-proof and dust-proof membrane assembly comprises a body and a supporting member. The body is of membrane and has a first surface, a second surface, and an asymmetric porous structure formed between the first surface and the second surface of the body. The asymmetric porous structure has a thickness ranging between 1 μm and 1000 μm, a first volumetric porosity ranging between 5% and 99%. The asymmetric porous structure has plural pores, and each pore has a pore diameter between 0.01 μm and 15 μm. The supporting member is of a polymeric material and has a first contacting surface, a second contacting surface, and a second volumetric porosity which is greater than the first volumetric porosity. The first contacting surface of the supporting member is adhered to the first surface of the body.

Claims

1. A water-proof and dust-proof membrane assembly, comprising

a body, which being in form of membrane and having a first surface, a second surface and an asymmetric porous structure, wherein the asymmetric porous structure is formed between the first surface and the second surface and the asymmetric porous structure comprises a thickness, a first volumetric porosity and plural pores, wherein the thickness ranges between 1 μ

m and 1000 μ

m, the first volumetric porosity ranges between 5% and 99%, and each pore has a pore diameter between 0.01 μ

m and 15 μ

m; and

a supporting member, which being made of a polymeric material and having a first contacting surface, a second contacting surface and a second volumetric porosity, wherein the first contacting surface is adhered to the first surface of the body, and the second volumetric porosity is greater than the first volumetric porosity.

2. The water-proof and dust-proof membrane assembly according to claim 1, wherein the second volumetric porosity ranges between 10% and 99.9%.

3. The water-proof and dust-proof membrane assembly according to claim 1, wherein the asymmetric porous structure comprises a dense portion and a normal portion, the dense portion is 0.04% to 40% of the thickness of the asymmetric porous structure, the dense portion has a water contact angle ranging between 120°

and 135°

.

4. The water-proof and dust-proof membrane assembly according to claim 3, wherein the first surface of the body is on the dense portion, so the water-proof and dust-proof membrane assembly has a water-proofness value ranging between 1500 and 8000 mmH₂O.

5. The water-proof and dust-proof membrane assembly according to claim 4, wherein the water-proof and dust-proof membrane assembly has an air-permeability value ranging between 0.4 and 5.8 cm³/cm² sec.

6. The water-proof and dust-proof membrane assembly according to claim 3, wherein the first surface of the body is on the normal portion, so the water-proof and dust-proof membrane assembly has a water-proofness value greater than 9000 mmH₂O.

7. The water-proof and dust-proof membrane assembly according to claim 6, wherein the water-proof and dust-proof membrane assembly has an air-permeability value ranging between 0.1 and 0.25 cm³/cm² sec.

8. The water-proof and dust-proof membrane assembly according to claim 1, wherein the body is made from a material selected from the group consisting of a resin porous film and a fluoropolymer film.

9. The water-proof and dust-proof membrane assembly according to claim 8, wherein the resin porous film is made from a material selected from the group consisting of an ultra-high molecular weight polyethylene porous film and a polytetrafluoroethylene film.

10. The water-proof and dust-proof membrane assembly according to claim 8, wherein the fluoropolymer film is made from a material selected from the group consisting of a partially fluorinated polymer and a fully fluorinated polymer.

11. An electronic device, comprising

a housing, which having at least one opening;

at least one electronic circuit module, which deposited inside the housing and corresponded to the opening; and

at least one water-proof and dust-proof membrane assembly, which disposed at the opening of the housing;

characterized in that the water-proof and dust-proof membrane assembly comprises;

a body, which being in form of membrane and having a first surface, a second surface and an asymmetric porous structure, wherein the asymmetric porous structure is formed between the first surface and the second surface and the asymmetric porous structure comprises a thickness, a first volumetric porosity and plural pores, wherein the thickness ranges between 1 μ

m and 1000 μ

m, the first volumetric porosity ranges between 5% and 99%, and each pore has a pore diameter between 0.01 μ

m and 15 μ

m; and

a supporting member, which being made of a polymeric material and having a first contacting surface, a second contacting surface and a second volumetric porosity, wherein the first contacting surface is adhered to the first surface of the body, and the second volumetric porosity is greater than the first volumetric porosity.

12. The electronic device according to claim 11, wherein the second volumetric porosity ranges between 10% and 99.9%.

13. The electronic device according to claim 11, wherein the asymmetric porous structure comprises a dense portion and a normal portion, the dense portion is 0.04% to 40% of the thickness of the asymmetric porous structure, the dense portion has a water contact angle ranging between 120°

and 135°

.

14. The electronic device according to claim 13, wherein the first surface of the body is on the dense portion, so the water-proof and dust-proof membrane assembly has a water-proofness value ranging between 1500 and 8000 mmH₂O, and the water-proof and dust-proof membrane assembly has an air-permeability value ranging between 0.4 and 5.8 cm³/cm² sec.

15. The electronic device according to claim 13, wherein the first surface of the body is on the normal portion, so the water-proof and dust-proof membrane assembly has a water-proofness value greater than 9000 mmH₂O, and the water-proof and dust-proof membrane assembly has an air-permeability value ranging between 0.1 and 0.25 cm³/cm² sec.

16. A lamp apparatus, comprising

a hollow housing, which having a window;

a cover, which configured to engage the window of the hollow housing, wherein the cover has at least one opening;

at least one light source device, which deposited inside the hollow housing and corresponded to the opening of the cover, wherein the light source device comprises at least one light-emitting diode; and

at least one said water-proof and dust-proof membrane assembly, which disposed at the opening of the cover;

characterized in that the water-proof and dust-proof membrane assembly comprises;

a body, which being in form of membrane and having a first surface, a second surface and an asymmetric porous structure, wherein the asymmetric porous structure is formed between the first surface and the second surface and the asymmetric porous structure comprises a thickness, a first volumetric porosity and plural pores, wherein the thickness ranges between 1 μ

m and 1000 μ

m, the first volumetric porosity ranges between 5% and 99%, and each pore has a pore diameter between 0.01 μ

m and 15 μ

m; and

a supporting member, which being made of a polymeric material and having a first contacting surface, a second contacting surface and a second volumetric porosity, wherein the first contacting surface is adhered to the first surface of the body, and the second volumetric porosity is greater than the first volumetric porosity.

17. The lamp apparatus according to claim 16, wherein the second volumetric porosity ranges between 10% and 99.9%.

18. The lamp apparatus according to claim 16, wherein the asymmetric porous structure comprises a dense portion and a normal portion, the dense portion is 0.04% to 40% of the thickness of the asymmetric porous structure, the dense portion has a water contact angle ranging between 120°

and 135°

.

19. The lamp apparatus according to claim 18, wherein the first surface of the body is on the dense portion, so the water-proof and dust-proof membrane assembly has a water-proofness value ranging between 1500 and 8000 mmH₂O, and the water-proof and dust-proof membrane assembly has an air-permeability value ranging between 0.4 and 5.8 cm³/cm² sec.

20. The lamp apparatus according to claim 18, wherein the first surface of the body is on the normal portion, so the water-proof and dust-proof membrane assembly has a water-proofness value greater than 9000 mmH₂O, and the water-proof and dust-proof membrane assembly has an air-permeability value ranging between 0.1 and 0.25 cm³/cm² sec.