LED Lamp

• US 6,940,101 B2
• Filed: 11/25/2003
• Issued: 09/06/2005
• Est. Priority Date: 11/25/2002
• Status: Active Grant

• Current Assignee: Sovereign Peak Ventures, LLC (Dominion Harbor Enterprises, LLC)
• Original Assignee: Matsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
• Inventors: Matsui, Nobuyuki, Setomoto, Tatsumi, Tamura, Tetsushi, Yano, Tadashi, Shimizu, Masanori
• Primary Examiner(s): JACKSON JR, JEROME
• Application Number:
  US10/721,981
• Publication Number:
  US 20040119086A1
• Time in Patent Office: 651 Days
• Field of Search: 257/98, 257/100
• US Class Current: 257/98
• CPC Class Codes: H01L 2224/05568 the whole external layer protruding from the surface
• CPC Class Codes: H01L 2224/05573 Single external layer
• CPC Class Codes: H01L 2224/05599 Material
• CPC Class Codes: H01L 2224/16225 the item being non-metallic, e.g. insulating substrate with or without metallisation
• 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 2224/48257 connecting the wire to a die pad of the item
• CPC Class Codes: H01L 2224/49107 on the semiconductor or solid-state body
• CPC Class Codes: H01L 2224/8592 Applying permanent coating, e.g. protective coating
• CPC Class Codes: H01L 2924/00012 Relevant to the scope of the group, the symbol of which is combined with the symbol of this group
• 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 2924/181 Encapsulation
• CPC Class Codes: H01L 33/44 characterised by the coatings, e.g. passivation layer or anti-reflective coating
• CPC Class Codes: H01L 33/50 Wavelength conversion elements

Abstract

An LED lamp includes at least one LED chip and a wavelength converting portion including a phosphor for transforming the emission of the LED chip into light having a longer wavelength than that of the emission. The LED lamp further includes filtering member. The filtering member is designed such that the spectral transmittance thereof becomes lower in at least a portion of the wavelength range of 550 nm to 605 nm than in the remaining visible radiation range.

Claims

1. An LED lamp comprising:

at least one LED chip, the emission of which has a peak wavelength in the range of 400 nm to 490 nm; and

a wavelength converting portion including a phosphor for transforming the emission of the LED chip into light having a longer wavelength than that of the emission,

wherein the LED lamp further includes filtering means, which is designed such that the spectral transmittance thereof becomes lower in at least a portion of the wavelength range of 550 nm to 605 nm than in the remaining visible radiation range.

2. The LED lamp of claim 1, wherein the LED chip is mounted on a substrate.

3. The LED lamp of claim 2, wherein the LED chip is flip-chip bonded to the substrate.

4. The LED lamp of claim 1, wherein the wavelength converting portion is made of a resin.

5. The LED lamp of claim 4, wherein the wavelength converting portion has a cylindrical shape and covers the LED chip entirely.

6. The LED lamp of claim 4, the wavelength converting portion is further covered with another resin.

7. The LED lamp of claim 1, wherein the filtering means is arranged so as to cover the wavelength converting portion.

8. The LED lamp of claim 1, wherein the filtering means is made of a resin.

9. The LED lamp of claim 1, wherein the wavelength converting portion and the filtering means are both made of the same resin and substantially no interface is present between the wavelength converting portion and the filtering means.

10. The LED lamp of claim 4, wherein the wavelength converting portion made of the resin includes an Nd compound, and functions as the filtering means as well.

11. The LED lamp of claim 10, wherein the wavelength converting portion has a cylindrical shape and covers the LED chip entirely.

12. The LED lamp of claim 10, further comprising a reflector that has an opening surrounding the wavelength converting portion.

13. The LED lamp of claim 1, wherein the filtering means is designed such that the spectral transmittance thereof becomes lower in the wavelength subrange of 575 nm to 590 nm than in the remaining visible radiation range.

14. The LED lamp of claim 13, wherein the spectral transmittance of the filtering means in the wavelength subrange of 575 nm to 590 nm is controlled to be 10% to 95% of the spectral transmittance thereof in the remaining visible radiation range.

15. The LED lamp of claim 1, wherein the spectral transmittance of the filtering means is controlled so as to increase the average color rendering index Ra of the LED lamp.

16. The LED lamp of claim 1, wherein the LED lamp has a card shape so as to be attachable to, or removable from, an illumination unit including a lighting circuit.