Transparent coating member for light-emitting diodes and a fluorescent color light source

• US 6,319,425 B1
• Filed: 02/08/2000
• Issued: 11/20/2001
• Est. Priority Date: 07/07/1997
• Status: Expired due to Term

• Current Assignee: Asahi Rubber Inc., Sanken Electric Company Limited
• Original Assignee: Asahi Rubber Inc., Sanken Electric Company Limited
• Inventors: Takagi, Kazuhisa, Odaki, Tsutomu, Ichikawa, Akira, Tasaki, Masutsugu
• Primary Examiner(s): Koslow, C. Melissa
• Application Number:
  US09/499,345
• Time in Patent Office: 651 Days
• Field of Search: 252/301.36, 257/98, 313/501, 313/503
• US Class Current: 252/301.36
• CPC Class Codes: H01L 2224/48091 Arched
• CPC Class Codes: H01L 2224/48247 connecting the wire to a bond pad of the item
• CPC Class Codes: H01L 2924/00014 the subject-matter covered by the group, the symbol of which is combined with the symbol of this group, being disclosed without further technical details
• CPC Class Codes: H01L 33/507 the elements being in intimate contact with parts other than the semiconductor body or integrated with parts other than the semiconductor body

Abstract

This invention relates to a transparent coating member mountable on a light-emitting diode including a fluorescent substance and a light diffusion substance including calcium carbonate in order to reduce color variation at various locations of a transparent coating member and also reduce manufacturing costs of the transparent coating member without significantly lower the level of chromaticity. Furthermore, this invention relates to a transparent coating member mountable on a light-emitting diode (LED) including a fluorescent substance and a light storing pigment. This structure allows an exhibition of afterglow of the transparent coating member after turning off the light in a room so that locating the position of the transparent coating member is made easier thereafter. The light diffusion substance and the light storing pigment can be added to the transparent coating member to acquire both advantages derived from respective substances.

Claims

1. A method of producing a transparent coating member, comprising:

providing a silicone rubber material and a fluorescent substance together in a manner so that a coating member is formed having an upper and a lower surfaces; and

sand blasting at least one of the upper and lower surfaces.

2. The method of producing a transparent coating member according to claim 1, wherein said step of sand blasting is done at on both the upper and the lower surfaces.

3. A The method of producing a transparent coating member according to claim 2, wherein said step of sand blasting is done at a #100 level.

4. The method of producing a transparent coating as defined in claim 1, wherein said step of providing includes using a YAG fluophor and molding the silicone rubber and the YAG fluophor into a cap shape material in a die cast mold;

and said method further comprising the step of;

removing the molded material from the die cast mold followed by said step of sand blasting, wherein said step of sand blasting includes sand blasting both the upper and the lower surfaces.

5. A molded transparent covering member having a size so as to be mountable on a housing of a light-emitting diode, comprising:

a molded main body, said molded main body including;

a fluorescent substance; and

a light diffusion substance.

6. A molded transparent covering member as defined in claim 5, wherein said light diffusion substance includes at least 97% of calcium carbonate and at most 3% of barium stearate.

7. A molded transparent covering member as defined in claim 5, wherein said light diffusion substance includes a material selected from a group consisting of flower of zinc;

lead white;

basic lead sulfate;

lead sulfate;

lithopone;

zinc sulfide;

titanium oxide;

antimony oxide;

calcium carbonate;

calcium phosphate;

aluminum silicate;

magnesium silicate;

calcium silicate;

silica;

magnesium oxide;

magnesium carbonate;

aluminum hydroxide; and

magnesium hydroxide.

8. A molded transparent covering member as defined in claim 5, wherein said fluorescent substance includes a YAG fluophor.

9. A molded transparent covering member as defined in claim 5, wherein said fluorescent substance includes Y₃Al₅O₁₂:

Ce.

10. A molded transparent covering member as defined in claim 5, further comprising a silicon rubber material and a curing agent.

11. A molded transparent covering member as defined in claim 5, wherein the light diffusion substance is included in an amount that is inversely proportional to an amount of the YAG fluophor.

12. A molded transparent covering member as defined in claim 5, wherein said molded main body has a recessed region formed in a surface of said molded main body.

13. A molded transparent covering member as defined in claim 5, wherein said molded main body has a size so as to provide a close contact fit when said molded transparent covering member is disposed on the housing of the light-emitting diode.

14. A transparent covering member to be disposed on a housing of a light-emitting diode, comprising:

a main body having a substantially U-shaped cross-section, said main body further including;

a fluorescent substance; and

a light diffusion substance.

15. A transparent covering member as defined in claim 14, wherein said light diffusion substance includes at least 97% of calcium carbonate and at most 3% of barium stearate.

16. A transparent covering member as defined in claim 14, wherein said light diffusion substance includes a material selected from a group consisting of flower of zinc;

lead white;

basic lead sulfate;

lead sulfate;

lithopone;

zinc sulfide;

titanium oxide;

antimony oxide;

calcium carbonate;

calcium phosphate;

aluminum silicate;

magnesium silicate;

calcium silicate;

silica;

magnesium oxide;

magnesium carbonate;

aluminum hydroxide; and

magnesium hydroxide.

17. A transparent covering member as defined in claim 14, wherein said fluorescent substance includes a YAG fluophor.

18. A transparent covering member as defined in claim 14, wherein said fluorescent substance includes Y₃Al₅O₁₂:

Ce.

19. A transparent covering member as defined in claim 14, further comprising a silicon rubber material and a curing agent.

20. A transparent covering member as defined in claim 14, wherein the light diffusion substance is included in an amount that is inversely proportional to an amount of the YAG fluophor.

21. A transparent covering member as defined in claim 14, wherein said main body has a recessed region formed in a surface of said main body.

22. A transparent covering member as defined in claim 14, wherein said main body has a size so as to provide a close contact fit when said transparent covering member is disposed on the housing of the light-emitting diode.

23. A transparent covering member to be disposed on a housing of a light-emitting diode, comprising:

a main body having at least one planar surface and at least one side edge, said main body further including;

a fluorescent substance; and

a light diffusion substance.

24. A transparent covering member as defined in claim 23, wherein said light diffusion substance includes at least 97% of calcium carbonate and at most 3% of barium stearate.

25. A transparent covering member as defined in claim 23, wherein said light diffusion substance includes a material selected from a group consisting of flower of zinc;

lead white;

basic lead sulfate;

lead sulfate;

lithopone;

zinc sulfide;

titanium oxide;

antimony oxide;

calcium carbonate;

calcium phosphate;

aluminum silicate;

magnesium silicate;

calcium silicate;

silica;

magnesium oxide;

magnesium carbonate;

aluminum hydroxide; and

magnesium hydroxide.

26. A transparent covering member as defined in claim 23, wherein said fluorescent substance includes a YAG fluophor.

27. A transparent covering member as defined in claim 23, wherein said fluorescent substance includes Y₃Al₅O₁₂:

Ce.

28. A transparent covering member as defined in claim 23, further comprising a silicon rubber material and a curing agent.

29. A transparent covering member as defined in claim 23, wherein the light diffusion substance is included in an amount that is inversely proportional to an amount of the YAG fluophor.

30. A transparent covering member as defined in claim 23, wherein said main body has a recessed region formed in a surface of said main body.

31. A transparent covering member as defined in claim 23, wherein said main body has a size so as to provide a close contact fit when said transparent covering member is disposed on the housing of the light-emitting diode.

32. A transparent covering member to be disposed on a housing of a light-emitting diode, comprising:

a main body having at least one textured surface, said main body further including;

a fluorescent substance; and

a light diffusion substance.

33. A transparent covering member as defined in claim 32, wherein said light diffusion substance includes at least 97% of calcium carbonate and at most 3% of barium stearate.

34. A transparent covering member as defined in claim 32, wherein said light diffusion substance includes a material selected from a group consisting of flower of zinc;

lead white;

basic lead sulfate;

lead sulfate;

lithopone;

zinc sulfide;

titanium oxide;

antimony oxide;

calcium carbonate;

calcium phosphate;

aluminum silicate;

magnesium silicate;

calcium silicate;

silica;

magnesium oxide;

magnesium carbonate;

aluminum hydroxide; and

magnesium hydroxide.

35. A transparent covering member as defined in claim 32, wherein said fluorescent substance includes a YAG fluophor.

37. A transparent covering member as defined in claim 32, further comprising a silicon rubber material and a curing agent.

38. A transparent covering member as defined in claim 32, wherein the light diffusion substance is included in an amount that is inversely proportional to an amount of the YAG fluophor.

39. A transparent covering member as defined in claim 32, wherein said main body has a recessed region formed in a surface of said main body.

40. A transparent covering member as defined in claim 32, wherein said main body has a size so as to provide a close contact fit when said transparent covering member is disposed on the housing of the light-emitting diode.

36. A transparent covering member as defined in claim wherein said fluorescent substance includes Y₃Al₅O₁₂:

Ce.

41. A molded transparent covering member to be disposed on a housing of a light-emitting diode, comprising:

a molded main body having a uniform thickness, said main body further including;

a fluorescent substance; and

a light diffusion substance.

42. A molded transparent covering member as defined in claim 41, wherein said light diffusion substance includes at least 97% of calcium carbonate and at most 3% of barium stearate.

43. A molded transparent covering member as defined in claim 41, wherein said light diffusion substance includes a material selected from a group consisting of flower of zinc;

lead white;

basic lead sulfate;

lead sulfate;

lithopone;

zinc sulfide;

titanium oxide;

antimony oxide;

calcium carbonate;

calcium phosphate;

aluminum silicate;

magnesium silicate;

calcium silicate;

silica;

magnesium oxide;

magnesium carbonate;

aluminum hydroxide; and

magnesium hydroxide.

44. A molded transparent covering member as defined in claim 41, wherein said fluorescent substance includes a YAG fluophor.

45. A molded transparent covering member as defined in claim 41, wherein said fluorescent substance includes Y₃Al₅O₁₂:

Ce.

46. A molded transparent covering member as defined in claim 41, further comprising a silicon rubber material and a curing agent.

47. A molded transparent covering member as defined in claim 41, wherein the light diffusion substance is included in an amount that is inversely proportional to an amount of the YAG fluophor.

48. A molded transparent covering member as defined in claim 41, wherein said molded main body has a size so as to provide a close contact fit when said molded transparent covering member is disposed on the housing of the light-emitting diode.