Light-guiding cover and illumination device having the same
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
F21V-007/04
H01L-033/00
F21V-005/00
F23D-003/16
F21S-004/00
F21V-021/00
F21V-003/00
출원번호
US-0339228
(2011-12-28)
등록번호
US-8764260
(2014-07-01)
발명자
/ 주소
Liang, Chun-Wei
출원인 / 주소
Lite-On Technology Corporation
대리인 / 주소
Li & Cai Intellectual Property (USA) Office
인용정보
피인용 횟수 :
0인용 특허 :
9
초록▼
The present invention relates to a light-guiding cover and an illumination device having the same. The light-guiding cover, for guiding light beams emitted by at least one light-emitting diode (LED), has a light-guiding portion and a light output portion. The light-guiding portion has a light input
The present invention relates to a light-guiding cover and an illumination device having the same. The light-guiding cover, for guiding light beams emitted by at least one light-emitting diode (LED), has a light-guiding portion and a light output portion. The light-guiding portion has a light input surface for transmitting light beams thereto and a connecting surface. The light output portion formed on one end of the light-guiding portion has an optical surface adjoining the connecting surface. The light-guiding cover is substantially symmetrical and defines a central axis. The light beams received by the light-guiding portion are guided by the light input surface for light reflection from one side to another side of the optical surface across the central axis to exit from the light-output portion. Thus, the illumination device having the light-guiding cover can illuminate in an omni-directional manner.
대표청구항▼
1. A light-guiding cover, integrally formed in solid one piece for guiding light beams emitted from at least one light-emitting diode (LED), comprising: a light-guiding portion, wherein a light input surface is formed on one end of the light-guiding portion and orientated toward an LED, wherein the
1. A light-guiding cover, integrally formed in solid one piece for guiding light beams emitted from at least one light-emitting diode (LED), comprising: a light-guiding portion, wherein a light input surface is formed on one end of the light-guiding portion and orientated toward an LED, wherein the light input surface transmits light beams emanating from the LED into the light-guiding portion, wherein the light-guiding portion—further has a connecting surface; anda light output portion extending from another end of the light-guiding portion, wherein the light output portion has an optical surface extending from the connecting surface, wherein the overall profile shape of the light output portion is tapered away from the light-guiding portion to an upper end portion of the light output portion away from the LED;wherein the light-guiding cover is substantially symmetrical around a central axis, each cross-section of the light output portion normal to the central axis is substantially circular, wherein the diameters of the cross-sections of the light output portion decrease in a direction away from the light-guiding portion, and the optical surface allows the light beams emanating from the LED to reflect or pass therethrough, and wherein the light beams emanating from the LED are refracted by the light input surface and enters the light-guiding portion for light reflection from one side to another side of the optical surface across the central axis to exit from the light-output portion, wherein at least one virtual LED is produced on the central axis in the upper end portion of the light output portion away from the LED by the light beams transmitted by the light input surface into the light-guiding portion. 2. The light-guiding cover of claim 1, wherein the light input surface has a central surface and an annular surface, and the annular surface is formed adjacent to the central surface, wherein the central surface and the annular surface cooperatively define an accommodating space for receiving the LED. 3. The light-guiding cover of claim 2, wherein the central surface is a free-form surface, a multi-segmented surface, a flat leveled surface, or a Fresnel lens-like surface, and the annular surface is a flat leveled surface, a parabolic surface, a free-form surface, or a multi-segmented surface, while the optical surface is a parabolic surface, a free-form surface, or a multi-segmented surface. 4. The light-guiding cover of claim 3, wherein the optical surface is a total internally reflective surface. 5. The light-guiding cover of claim 4, wherein the optical surface is a non-smooth surface. 6. The light-guiding cover of claim 2, wherein the light-guiding portion further has a reflecting surface, wherein the connecting surface adjoins the optical surface and the reflecting surface on opposite ends thereof, wherein the reflecting surface is formed extendingly from the connecting surface away from the optical surface, with the distance between the reflecting surface and the central axis gradually decreases in a direction away from the connecting surface, and wherein the reflecting surface reflects light beams transmitted by the annular surface to the optical surface. 7. The light-guiding cover of claim 1, wherein the light-guiding cover is a solid structure made from glass, acrylic glass, polyethylene (PE), poly(methyl acrylate), or any suitable combination thereof. 8. The light-guiding cover of claim 1, wherein the light-guiding cover is shaped like a candle flare or a chandelier bulb. 9. An illumination device, comprising: a mounting seat;at least one LED disposed on the mounting seat for emitting light beams; anda light-guiding cover disposed on the mounting seat for guiding light beams emitted from the LED, wherein the light-guiding cover is integrally formed in solid one piece and comprises: a light-guiding portion, wherein a light input surface is formed on one end of the light-guiding portion and orientated toward the LED, wherein the light input surface transmits light beams emanating from the LED into the light-guiding portion, wherein the light-guiding portion further has a connecting surface; anda light output portion extending from another end of the light-guiding portion, wherein the light output portion has an optical surface extending from the connecting surface, wherein the overall profile shape of the light output portion is tapered away from the light-guiding portion to an upper end portion of the light output portion away from the LED;wherein the light-guiding cover is substantially symmetrical around a central axis, each cross-section of the light output portion normal to the central axis is substantially circular, wherein the diameters of the cross-sections of the light output portion decrease in a direction away from the light-guiding portion, and the optical surface allows the light beams emanating from the LED to reflect or pass therethrough, and wherein the light beams emanating from the LED are refracted by the light input surface and enters the light-guiding portion for light reflection from one side to another side of the optical surface across the central axis to exit from the light-output portion, wherein at least one virtual LED is produced on the central axis in the upper end portion of the light output portion away from the LED by the light beams transmitted by the light input surface into the light-guiding portion. 10. The illumination device of claim 9, wherein the mounting seat includes a lamp cap and a heat sink, wherein the lamp cap and the LED are arranged on opposite ends of the heat sink, with the LED being electrically connected to the lamp cap. 11. The illumination device of claim 9, wherein the light input surface has a central surface and an annular surface, and the annular surface is formed adjacent to the central surface, wherein the central surface and the annular surface cooperatively define an accommodating space for receiving the LED. 12. The illumination device of claim 11, wherein the central surface is a free-form surface, a multi-segmented surface, a flat leveled surface, or a Fresnel lens-like surface, and the annular surface is a flat leveled surface, a parabolic surface, a free-form surface, or a multi-segmented surface, while the optical surface is a parabolic surface, a free-form surface, or a multi-segmented surface. 13. The illumination device of claim 12, wherein the optical surface is a non-smooth surface. 14. The illumination device of claim 12, wherein at least one virtual LED is produced on the central axis by the light beams transmitted by the light input surface into the light-guiding portion. 15. The illumination device of claim 11, wherein the light-guiding portion further has a reflecting surface, wherein the connecting surface adjoins the optical surface and the reflecting surface on opposite ends thereof, wherein the reflecting surface is formed extendingly from the connecting surface away from the optical surface, with the distance between the reflecting surface and the central axis gradually decreases in a direction away from the connecting surface, and wherein the reflecting surface reflects light beams transmitted by the annular surface to the optical surface. 16. The illumination device of claim 11, wherein the central surface is substantially in contact with a light emitting surface of the LED, and the annular surface is substantially in contact with side portions of the LED. 17. The illumination device of claim 12, wherein the optical surface is a total internally reflective surface. 18. The illumination device of claim 9, wherein the light-guiding cover is shaped like a candle flare or a chandelier bulb. 19. The illumination device of claim 9, wherein the light-guiding cover is a solid structure made from glass, acrylic glass, polyethylene (PE), poly(methyl acrylate), or any suitable combination thereof.
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이 특허에 인용된 특허 (9)
Hoffman Marc (St-Lambert CAX) Dick Georges P. (Verdun CAX), Double refraction and total reflection solid nonimaging lens.
Taylor, Wilfrid E.; Taylor, Wilfrid L.; Taylor, James R.; Kappel, David W.; Wu, Paul Nam-Kwan, Optical lens system for projecting light in a lambertion pattern from a high power led light source.
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