Claims
- 1. A method of manufacturing a reflector of a satelite broadcasting receiving parabolic antenna having a reflectivity rate of at least 90%, comprising the steps of:
- providing a first melted synthetic resin;
- providing a second melted synthetic resin having pieces of an electric wave reflective material dispersed therein, the amount of said electric wave reflective material being 4 to 10% by weight and sufficient to provide said reflectivity rate of at least 90%, said pieces of said electric wave reflective material being in the shape of fibers each of which has a width of 10 to 500 microns and a length of 0.5 mm to 200 mm;
- forming a skin layer for the reflector by injecting the first melted synthetic resin into a mold cavity; and
- forming a core layer enclosed within said skin layer by injecting into said mold cavity the second melted synthetic resin with the electric wave reflective material pieces dispersed therein.
- 2. The method of claim 1, wherein the core layer forming step comprises injecting into the mold cavity the second melted synthetic resin with the electric wave reflective material pieces dispersed therein while it is disposed within the first melted synthetic resin which itself is being injected into the mold cavity.
- 3. The method of claim 1, wherein said fibers have a length of 0.5 mm to 50 mm.
- 4. The method of claim 1, wherein said fibers have a length of 0.5 mm to 30 mm.
- 5. The method of claim 1, wherein the electric wave reflective material is a corrosion resistant material.
- 6. The method of claim 1, wherein the amount of said electric wave reflective material used in the second melted synthetic resin is approximately 8% by weight.
- 7. The method of claim 1, further comprising the step of coating the parabolic surface of the reflector with a protective coating.
- 8. The method of claim 1, further comprising the step of coating the parabolic surface of the reflector with a conductive coating.
- 9. The method of claim 8, further comprising the step of coating the conductive coating with a protective coating.
- 10. The method of claim 1, further comprising the step of dispersing a blowing agent in said second melted synthetic resin.
- 11. A method of manufacturing a reflector of a satelite broadcasting receiving parabolic antenna having a reflectivity rate of at least 90%, comprising the steps of:
- providing a first melted synthetic resin;
- providing a second melted synthetic resin having a piece of an electric wave reflective material dispersed therein, the amount of said electric wave reflective material being 4 to 10% by weight and sufficient to provide said reflectivity rate of at least 90%, said pieces of said electric wave reflective material being in the shape of flakes each of which has the dimensions of 2 microns to 30 microns in width and length;
- forming a skin layer for the reflector by injecting the first melted synthetic resin into a mold cavity; and
- forming a core layer enclosed within said skin layer by injecting into said mold cavity the second melted synthetic resin with the electric wave reflective material pieces dispersed therein.
- 12. The method of claim 11, wherein the core layer forming step comprises injecting into the mold cavity the second melted synthetic resin with the electric wave reflective material pieces dispersed therein while it is disposed within the first melted synthetic resin which itself is being injected into the mold cavity.
- 13. The method of claim 11, wherein the electric wave reflective material is a corrosion resistant material.
- 14. The method of claim 11, wherein the amount of said electric wave reflective material used in the second melted synthetic resin is approximately 8% by weight.
- 15. The method of claim 11, further comprising the step of coating the parabolic surface of the reflector with a protective coating.
- 16. The method of claim 11, further comprising the step of coating the parabolic surface of the reflector with a conductive coating.
- 17. The method of claim 16, further comprising the step of coating the conductive coating with a protective coating.
- 18. The method of claim 11, further comprising the step of dispersing a blowing agent in said second melted synthetic resin.
- 19. A method of manufacturing a reflector of a satelite broadcasting receiving parabolic antenna having a reflectivity rate of at least 90%, comprising the steps of:
- providing a first melted synthetic resin;
- providing a second melted synthetic resin having pieces of an electric wave reflective material dispersed therein, the amount of said electric wave reflective material being 4 to 10% by weight and sufficient to provide said reflectivity rate of at least 90%, said pieces of said electric wave reflective material being in the shape of particles each of which has the dimensions of 2 microns to 30 microns for any of its width, length and height;
- forming a skin layer for the reflector by injecting the first melted synthetic resin into a mold cavity; and
- forming a core layer enclosed within said skin layer by injecting into said mold cavity the second melted synthetic resin with the electric wave reflective material pieces dispersed therein.
- 20. The method of claim 19, wherein the core layer forming step comprises injecting into the mold cavity the second melted synthetic resin with the electric wave reflective material pieces dispersed therein while it is disposed within the first melted synthetic resin which itself is being injected into the mold cavity.
- 21. The method of claim 19, wherein the electric wave reflective material is a corrosion resistant material.
- 22. The method of claim 19, wherein the amount of said electric wave reflective material used in the second melted synthetic resin is approximately 8% by weight.
- 23. The method of claim 19, further comprising the step of coating the parabolic surface of the reflector with a protective coating.
- 24. The method of claim 19, further comprising the step of coating the parabolic surface of the reflector with a conductive coating.
- 25. The method of claim 24, further comprising the step of coating the conductive coating with a protective coating.
- 26. The method of claim 19, further comprising the step of dispersing a blowing agent in said second melted synthetic resin.
Priority Claims (1)
Number |
Date |
Country |
Kind |
63-79310 |
Mar 1988 |
JPX |
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Parent Case Info
This application is a continuation-in-part, of application Ser. No. 07/311,229 filed Feb. 15, 1989, now abandoned.
US Referenced Citations (6)
Foreign Referenced Citations (6)
Number |
Date |
Country |
0298060 |
Jan 1989 |
EPX |
2426343 |
Jan 1980 |
FRX |
0149802 |
Nov 1981 |
JPX |
0055708 |
Apr 1984 |
JPX |
0223007 |
Dec 1984 |
JPX |
0229503 |
Nov 1985 |
JPX |
Non-Patent Literature Citations (1)
Entry |
Pappas and Murphy, Encapsulating Precision Antennas in Plastic, (Electronics, 3/8/63). |
Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
311229 |
Feb 1989 |
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