LED lighting assembly and an LED retrofit lamp having the LED lighting assembly

1. An LED lighting assembly, comprising:

a printed circuit board with an LED chip, and

a heat sink thermally conducted with the printed circuit board,

wherein the LED lighting assembly further comprises a light guide body configured as a bulb, the light guide body having an end surface as a light incidence surface of light from the LED chip, an outer surface as a light emergent surface and an inner surface, wherein the inner surface is structured so as to form a reflecting surface, reflecting at least part of light from the end surface to the outer surface,

wherein a plurality of annular grooves are provided on the inner surface, the annular grooves are spaced apart in a direction from the end surface to a top of the bulb.

2. The LED lighting assembly according to claim 1 , wherein a cross section of the annular groove is in a V shape, and the reflecting surface is defined by two groove side surfaces of the V shape-annular groove, wherein the reflecting surface faces the outer surface.

3. The LED lighting assembly according to claim 2 , wherein a plane defined by the surface of each annular groove is parallel to a plane defined by the end surface.

4. The LED lighting assembly according to claim 1 , wherein the end surface is supported on the printed circuit board, and is provided with an accommodating recess in which the LED chip is received.

5. An LED lighting assembly, comprising:

a printed circuit board with an LED chip, and

a heat sink thermally conducted with the printed circuit board,

wherein the LED lighting assembly further comprises a light guide body configured as a bulb, the light guide body having an end surface as a light incidence surface of light from the LED chip, an outer surface as a light emergent surface and an inner surface, wherein the inner surface is structured so as to form a reflecting surface, reflecting at least 13 part of light from the end surface to the outer surface,

wherein a plurality of annular grooves are provided on the inner surface, the annular grooves are spaced apart in a direction from the end surface to a top of the bulb, and

wherein an interval between the annular grooves in a direction from the end surface to a top of the bulb gradually become smaller.

6. The LED lighting assembly according to claim 2 , wherein an angle between two groove side surfaces of each annular groove is in a range of 60° to 120°.

7. The LED lighting assembly according to claim 6 , wherein the bulb is divided in a direction from the end surface to a top of the bulb into a bottom area, a middle area and a top area, and wherein an angle between two groove side surfaces of the annular groove in the bottom area, the middle area and the top area is 120°-110°, 110°-80°, and 80°-60°, respectively.

8. The LED lighting assembly according to claim 1 , wherein the LED lighting assembly further comprises an additional reflecting cover neighboring the inner surface in an inner side of the bulb.

9. The LED lighting assembly according to claim 1 , wherein the printed circuit board has an empty central region and a peripheral region arranged with the LED chip.

10. The LED lighting assembly according to claim 9 , wherein the heat sink is provided with a hollow region extending up to the empty central region.

11. The LED lighting assembly according to claim 1 , wherein the bulb is configured to be a hollow hemispherical shape or a hollow column, cube, pyramid or cone.

12. The LED lighting assembly according to claim 1 , wherein the bulb consists of two, four or six sub bulbs equally divided on a circumference of the bulb.

13. The LED lighting assembly according to claim 12 , wherein the sub bulbs are bonded or welded together.

14. The LED lighting assembly according to claim 1 , wherein the bulb is made from a glass or a plastic.

15. An LED retrofit lamp, wherein the LED retrofit lamp has a lamp holder and a LED lighting assembly, the LED lighting assembly, comprising a printed circuit board with an LED chip, and a heat sink thermally conducted with the printed circuit board, wherein the LED lighting assembly further comprises a light guide body configured as a bulb, the light guide body having an end surface as a light incidence surface of light from the LED chip, an outer surface as a light emergent surface and an inner surface, wherein the inner surface is structured so as to form a reflecting surface, reflecting at least part of light from the end surface to the outer surface, and the lamp holder is fixed on the heat sink of the LED lighting assembly to connect the LED lighting assembly to a power supply,

wherein a plurality of annular grooves are provided on the inner surface, the annular grooves are spaced apart in a direction from the end surface to a top of the bulb.