LIGHTING APPARATUS

• US 20090316383A1
• Filed: 06/18/2009
• Published: 12/24/2009
• Est. Priority Date: 06/20/2008
• Status: Active Grant

• Current Assignee: Seoul Semiconductor Co., Ltd.
• Original Assignee: Seoul Semiconductor Co., Ltd.
• Inventors: Gulmira, Osmonalieva, Aliyev, Yevgeni, SON, Won-Kuk
• Granted Patent: US 9,074,751 B2
• Time in Patent Office: Days
• US Class Current: 362/84
• CPC Class Codes: F21V 13/08 the elements being filters or photoluminescent elements and reflectors
• CPC Class Codes: F21V 14/006 by means of optical elements, e.g. films, filters or screens, being rolled up around a roller
• CPC Class Codes: F21V 7/0008 providing for indirect lighting
• CPC Class Codes: F21V 7/005 with an elongated shape to cooperate with linear light sources
• CPC Class Codes: F21V 9/32 characterised by the arrangement of the photoluminescent material
• CPC Class Codes: F21V 9/40 with provision for controlling spectral properties, e.g. colour, or intensity
• 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 lighting apparatus includes a light reflector, a light emitting diode (LED) and a light-changing film. The light reflector has a concave surface. The LED is disposed under the concave surface of the light reflector to provide the concave surface with light. The light-changing film converts a first light generated by the LED into a second light. For example, the light-changing film may be a fluorescent film receiving the first light and emitting the second light with increased wavelength. The LED and the light-changing film are spaced apart from each other to minimize discoloration of the light-changing film.

Claims

1. A lighting apparatus, comprising:

a light reflector having a concave surface;

a light emitting diode (LED) disposed under the concave surface of the light reflector to provide the concave surface with light; and

a light-changing film to convert a first light generated by the LED into a second light.

2. The lighting apparatus of claim 1, wherein the light-changing film is a fluorescent film to receive the first light having a first wavelength and to emit the second light having a second wavelength, the second wavelength being greater than the first wavelength.

3. The lighting apparatus of claim 2, wherein the fluorescent film is spaced apart from the LED.

4. The lighting apparatus of claim 3, wherein the LED has a first surface through which light is emitted and a second surface opposite the first surface, and the LED is disposed such that the first surface faces the fluorescent film.

5. The lighting apparatus of claim 3, wherein the light reflector is extended along a first direction, and a plurality of LEDs is arranged in at least one line along the first direction.

6. The lighting apparatus of claim 5, wherein the plurality of LEDs comprises at least two of a blue LED, a green LED, and a red LED, and the at least two LEDs are alternately disposed with each other along the first direction.

7. The lighting apparatus of claim 5, wherein each LED in the plurality of LEDs has a first surface through which light is emitted and a second surface opposite the first surface, and the plurality of LEDs is disposed such that the first surface of each LED faces the concave surface of the light reflector.

8. The lighting apparatus of claim 7, wherein the fluorescent film is disposed along the light reflector so that it is disposed between a light-reflecting surface of the light reflector and the plurality of LEDs.

9. The lighting apparatus of claim 8, further comprising a light-diffusing plate disposed adjacent to the second surface of each LED to diffuse light reflected by the light reflector.

10. The lighting apparatus of claim 5, wherein each LED of the plurality of LEDs has a first surface through which light is emitted and a second surface opposite the first surface, and the plurality of LEDs is disposed such that the second surface of each LED is adjacent to a concave surface of the light reflector.

11. The lighting apparatus of claim 10, further comprising a light-diffusing plate disposed under the first surface of each LED to diffuse light reflected by the light reflector.

12. The lighting apparatus of claim 11, wherein the fluorescent film is disposed on the light-diffusing plate and between the first surface of the plurality of LEDs and the light-diffusing plate.

13. The lighting apparatus of claim 1, further comprising an illumination width adjusting part to adjust a width of the light reflector by compressing side portions of the light reflector, wherein the light reflector comprises a flexible material.

14. The lighting apparatus of claim 13, wherein the illumination width adjusting part comprises:

a supporting part adjacent to side portions of the light reflector; and

a screw penetrating the supporting part and contacting the side portion of the light reflector, the screw configured to move forward or backward to control the width of the light reflector when the screw is rotated along a clock-wise direction or a counter clock-wise direction with respect to the supporting part.

15. The lighting apparatus of claim 14, wherein the illumination width adjusting part further comprises:

a motor to rotate the screw; and

a control part to control the motor.

16. A lighting apparatus, comprising:

a light reflector having a concave surface;

a light-generating part disposed under the concave surface of the light reflector to provide the light reflector with light; and

an illumination width adjusting part to adjust a width of the light reflector by compressing side portions of the light reflector.

17. A lighting apparatus, comprising:

a light reflector;

a light emitting diode (LED) part disposed under the light reflector, the LED part comprising at least one LED;

a fluorescent film having first to n-th fluorescent substance parts, each of the first to n-th fluorescent substance parts to convert light generated by the LED into light with at least one different color; and

a driving part to select one of the first to n-th fluorescent substance parts.

18. The lighting apparatus of claim 17, wherein each of the first to n-th fluorescent substance parts comprises at least one of a red fluorescent substance and a green fluorescent substance.

19. The lighting apparatus of claim 18, wherein the LED part comprises at least one blue LED or ultraviolet light LED, and the fluorescent film further comprises an (n+1)-th fluorescent substance part having no fluorescent substance to generate blue light or ultraviolet light when the (n+1)-th fluorescent substance part is selected.

20. The lighting apparatus of claim 18, wherein two fluorescent substance parts of the first to n-th fluorescent substance parts, have a different distribution of the red fluorescent substance and the green fluorescent substance.

21. The lighting apparatus of claim 17, wherein the driving part comprises:

a supporting part to fix the light reflector;

a selection part to select one of the first to n-th fluorescent substance parts; and

a rotation shaft connected to the selection part, the rotation shaft to wind up the fluorescent film when the selection part is rotated.

22. The lighting apparatus of claim 21, wherein the driving part further comprises an electrical rotating part to rotate the rotation shaft by electric power.

23. The lighting apparatus of claim 17, wherein the fluorescent film and the LED part are spaced apart from each other.

24. The lighting apparatus of claim 23, wherein the light reflector has a concave surface,

the LED part has a first surface through which light is emitted and a second surface opposite the first surface, and

the LED part is disposed such that the first surface of the LED part faces the concave surface of the light reflector.

25. The lighting apparatus of claim 23, wherein the light reflector has a concave surface,

the LED part has a first surface through which light is emitted and a second surface opposite the first surface, and

the LED part is disposed such that the second surface of the LED part is adjacent to the concave surface of the light reflector.