Stem structure and LED lighting device

1. A stem structure comprising:

a substrate, configured to be bent into a substrate device with an internal hollow structure, wherein a plurality of LED lamp beads and a plurality of pin needles are attached to a surface of the substrate device;

a horn mouth comprising a first wide mouth portion and a first narrow mouth portion opposite to the first wide mouth portion, the first narrow mouth portion being provided with a plurality of upper guide wires for connecting to the plurality of pin needles;

a plurality of lower guide wires, disposed inside the horn mouth, and configured to be connected to the plurality of upper guide wires through the first narrow mouth portion; and

a glass tube disposed inside the horn mouth and attached to the plurality of lower guide wires.

2. The stem structure as claimed in claim 1 , wherein the substrate device and the first wide mouth portion have a pad in a range from 28 mm to 55 mm.

3. The stem structure as claimed in claim 1 , wherein the substrate device is a polyhedral structure having at least four surfaces, and an air convection hole is disposed on the top of the substrate device, wherein the plurality of LED lamp beads are evenly attached to side surfaces and a top surface of the substrate device.

4. The stem structure as claimed in claim 1 , wherein the glass tube is integrally formed with the horn mouth, the plurality of upper guide wires and the plurality of lower guide wires by a sintering process.

5. The stem structure as claimed in claim 1 , wherein the number of the upper guide wire is at least three.

6. The stem structure as claimed in claim 5 , wherein the number of the plurality of pin needles is at least three, wherein two of the plurality of pin needles are connected to a positive electrode and a negative electrode of the plurality of LED lamp beads respectively, the remaining one of the plurality of pin needles which is not connected to the positive electrode and the negative electrode of the plurality of LED lamp beads is electrically neutral for supporting the stem structure.

7. The stem structure as claimed in claim 6 , wherein the three upper guide wires correspond to the three pin needles respectively, and are connected to the three pin needles by a butt welding process.

8. The stem structure as claimed in claim 1 , wherein the stem structure has a diameter in a range from 10 mm to 34 mm.

9. An LED lighting device comprising:

a glass bulb, wherein a lamp head is disposed at an opening of the glass bulb;

a driving circuit board fixedly connected to the lamp head with a collar, an input end of the driving circuit board being electrically connected to the lamp head; and

a stem structure, disposed inside the glass bulb, and configured to be electrically connected to an output end of the driving circuit board through the lower guide wire, wherein the stem structure comprises:

a substrate, configured to be bent into a substrate device with an internal hollow structure, wherein a plurality of LED lamp beads and a plurality of pin needles are attached to a surface of the substrate device;

a horn mouth comprising a first wide mouth portion and a first narrow mouth portion opposite to the first wide mouth portion, the first narrow mouth portion being provided with a plurality of upper guide wires for connecting to the plurality of pin needles;

a plurality of lower guide wires, disposed inside the horn mouth, and configured to be connected to the plurality of upper guide wires through the first narrow mouth portion; and

a glass tube disposed inside the horn mouth and attached to the plurality of lower guide wires.

10. The LED lighting device as claimed in claim 9 , wherein the glass bulb is designed such that the glass bulb is in the shape of an A-type glass bulb, or a B-type glass bulb, or an ST-type glass bulb, or a G-Type glass bulb, or a P-type glass bulb, or a BR type glass bulb.

11. The LED lighting device as claimed in claim 9 , wherein the substrate device and the first wide mouth portion have a pad in a range from 28 mm to 55 mm.

12. The LED lighting device as claimed in claim 9 , wherein the substrate device is a polyhedral structure having at least four surfaces, and an air convection hole is disposed on the top of the substrate device, wherein the plurality of LED lamp beads are evenly attached to side surfaces and a top surface of the substrate device.

13. The LED lighting device as claimed in claim 9 , wherein the glass tube is integrally formed with the horn mouth, the plurality of upper guide wires and the plurality of lower guide wires by a sintering process.

14. The LED lighting device as claimed in claim 9 , wherein the number of the upper guide wire is at least three.

15. The LED lighting device as claimed in claim 14 , wherein the number of the plurality of pin needles is at least three, wherein two of the plurality of pin needles are connected to a positive electrode and a negative electrode of the plurality of LED lamp beads respectively, the remaining one of the plurality of pin needles which is not connected to the positive electrode and the negative electrode of the plurality of LED lamp beads is electrically neutral for supporting the stem structure.

16. The LED lighting device as claimed in claim 15 , wherein the three upper guide wires correspond to the three pin needles respectively, and are connected to the three pin needles by a butt welding process.

17. The LED lighting device as claimed in claim 9 , wherein the stem structure has a diameter in a range from 10 mm to 34 mm.