Conversion type light emitting device

• US 8,109,649 B2
• Filed: 06/26/2009
• Issued: 02/07/2012
• Est. Priority Date: 06/27/2008
• Status: Active Grant

• Current Assignee: Seoul Semiconductor Co., Ltd.
• Original Assignee: Seoul Semiconductor Co., Ltd.
• Inventors: Son, Won Kuk, Aliyev, Yevgeni
• Primary Examiner(s): SHALLENBERGER, JULIE A
• Application Number:
  US12/492,786
• Publication Number:
  US 20090323306A1
• Time in Patent Office: 956 Days
• Field of Search: 362/230, 362/512
• US Class Current: 362/230
• CPC Class Codes: F21V 9/30 Elements containing photoluminescent material distinct from or spaced from the light source shades F21V1/17; globes, bowls or cover glasses F21V3/08, F21V3/12; refractors F21V5/10; reflectors F21V7/26, F21V7/30; elements with provision for controlling the spectral properties or intensity F21V9/40
• CPC Class Codes: F21V 9/32 characterised by the arrangement of the photoluminescent material
• CPC Class Codes: F21V 9/38 Combination of two or more photoluminescent elements of different materials
• CPC Class Codes: F21V 9/45 by adjustment of photoluminescent elements
• CPC Class Codes: F21Y 2103/10 comprising a linear array of point-like light-generating elements
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]

Abstract

A conversion type light emitting device includes at least one LED element having a predetermined light emitting range and a fluorescent element performing wavelength conversion of light emitted from the LED element when disposed at a first location in the predetermined light emitting range. The fluorescent element is movable from a first location to a second location outside the predetermined light emitting range.

Claims

1. A conversion type light emitting device, comprising:

at least one light emitting diode (LED) element to emit light in a light emitting direction; and

a fluorescent element to convert a wavelength of the light emitted from the LED element,

wherein the fluorescent element comprises a transparent fluorescent plate configured to be disposed at a first location where the transparent fluorescent plate wavelength-converts the light emitted from the LED element and to be disposed at a second location where the light emitted from the LED element is not wavelength converted, and

wherein the at least one LED element is mounted on a support element, and the fluorescent plate is pivotally connected to a first end and a second end of the support element by connecting elements.

2. The conversion type light emitting device of claim 1, wherein the transparent fluorescent plate is configured to wavelength-convert a light emitting side of the LED element at the first location and to expose the light emitting side of the LED element at the second location.

3. The conversion type light emitting device of claim 1, wherein the fluorescent element is disposed on a region of a rotatable transparent member surrounding the LED element.

4. The conversion type light emitting device of claim 3, wherein the rotatable transparent member comprises an elongated tube made of a transparent material and surrounds two or more linearly arranged LED elements.

5. The conversion type light emitting device of claim 1, wherein the fluorescent element is disposed on a longitudinal region of an elongated transparent member.

6. The conversion type light emitting device of claim 5, wherein the elongated transparent member is movable in a linear direction.

7. The conversion type light emitting device of claim 1, wherein the LED element comprises an ultraviolet (UV) LED element and the fluorescent element comprises a phosphor to convert a wavelength of UV light into light having a different wavelength from that of the UV light.

8. The conversion type light emitting device of claim 7, wherein the phosphor comprises a combination of red, green, and blue phosphors.

9. The conversion type light emitting device of claim 7, wherein the phosphor comprises a combination of blue and yellow phosphors.

10. The conversion type light emitting device of claim 1, further comprising:

a shifting member to move the fluorescent element or a member on which the fluorescent element is mounted.

11. A conversion type light emitting device, comprising:

a light emitting diode (LED) element; and

a fluorescent element to convert a wavelength of light emitted from the LED element,

wherein the fluorescent element is configured to move with respect to the LED element and comprises a transparent fluorescent plate to be disposed at a first position where the transparent fluorescent plate wavelength-converts the light emitted from the LED element and at a second position where the light emitted from the LED element is not wavelength converted, and

wherein the LED element is mounted on a support element, and the fluorescent plate is pivotally connected to a first end and a second end of the support element by connecting elements.

12. The conversion type light emitting device of claim 11, wherein the transparent fluorescent plate is configured to wavelength-convert a light emitting side of the LED element at the first position and to expose the light emitting side of the LED element at the second position.

13. The conversion type light emitting device of claim 11, wherein the fluorescent element is disposed on a region of a rotatable transparent member surrounding the LED element.

14. The conversion type light emitting device of claim 13, wherein the rotatable transparent member comprises an elongated tube made of a transparent material and surrounds two or more linearly arranged LED elements.

15. The conversion type light emitting device of claim 11, wherein the fluorescent element is disposed on a longitudinal region of an elongated transparent member movable in a linear direction.

16. The conversion type light emitting device of claim 11, wherein the LED element comprises an ultraviolet (UV) LED element and the fluorescent element comprises a phosphor to convert a wavelength of UV light into light having a different wavelength from that of the UV light.

17. The conversion type light emitting device of claim 16, wherein the phosphor comprises a combination of red, green, and blue phosphors.

18. The conversion type light emitting device of claim 16, wherein the phosphor comprises a combination of blue and yellow phosphors.

19. A conversion type light emitting device, comprising:

an ultraviolet (UV) light emitting diode (LED) element to emit light in a light emitting direction; and

a fluorescent element comprising a phosphor to convert a wavelength of UV light into light having a different wavelength from that of the UV light,

wherein the fluorescent element comprises a transparent fluorescent plate configured to be disposed at a first position where the transparent fluorescent plate wavelength-converts the light emitted from the UV LED element in the light emitting direction and to be disposed at a second position where the light emitted from the UV LED element in the light emitting direction is not wavelength converted, and

wherein the UV LED element is mounted on a support element, and the transparent fluorescent plate is pivotally connected to a first end and a second end of the support element by connecting elements.