An LED tube lamp including a glass lamp tube, an LED light strip disposed inside the glass lamp tube, and an end cap attached over an end of glass lamp tube is disclosed. The glass lamp tube is covered by a heat shrink sleeve. The inner surface of the glass lamp tube is formed with a rough surface or a light scattering region. The glass lamp tube includes a main body region, a rear end region, and a two-arc-shaped transition region connecting the main body region and the rear end region. The LED light strip includes a bendable circuit sheet being longer than the glass lamp tube to form a freely extending end portion.
1. An LED tube lamp, comprising:
a glass lamp tube covered by a heat shrink sleeve, wherein the inner surface of the glass lamp tube is formed with a rough surface and the roughness of the inner surface is higher than that of the outer surface, and the glass lamp tube comprises a main body region, a rear end region, and a two-arc-shaped transition region connecting the main body region and the rear end region;
an end cap disposed at one end of the glass lamp tube;
a power supply provided inside the end cap; and
an LED light strip disposed inside the glass lamp tube with a plurality of LED light sources mounted on the LED light strip;
wherein the LED light strip has a bendable circuit sheet mounted on an inner surface of the glass lamp tube to electrically connect the LED light sources with the power supply, the length of the bendable circuit sheet is larger than the length of the glass lamp tube to form a freely extending end portion at one end of the bendable circuit sheet along a longitudinal direction of the glass lamp tube, the freely extending end portion is electrically connected to the power supply, and the glass lamp tube and the end cap are secured by a hot melt adhesive.
2. The LED tube lamp of claim 1 , wherein the bendable circuit sheet is made of a metal layer structure.
3. The LED tube lamp of claim 2 , wherein the thickness range of the metal layer structure is 10 μm to 50 μm.
4. The LED tube lamp of claim 3 , wherein the metal layer structure is a patterned wiring layer.
5. The LED tube lamp of claim 1 , wherein the glass lamp tube is coated with an anti-reflection layer with a thickness of one quarter of the wavelength range of light coming from the LED light source.
6. The LED tube lamp of claim 5 , wherein the refractive index of the anti-reflection layer is a square root of the refractive index of the glass lamp tube with a tolerance of ±20%.
7. The LED tube lamp of claim 1 , wherein the heat shrink sleeve is substantially transparent with respect to the wavelength of light from the LED light sources.
8. An LED tube lamp, comprising:
a glass lamp tube covered by a heat shrink sleeve with the thickness range of the heat shrink sleeve being 20 μm to 200 μm, wherein at least part of the inner surface of the glass lamp tube is formed with a light scattering region, and the glass lamp tube comprises a main body region, a rear end region, and a two-arc-shaped transition region connecting the main body region and the rear end region;
an end cap disposed at one end of the glass lamp tube;
a power supply provided inside the end cap; and
an LED light strip disposed inside the glass lamp tube with a plurality of LED light sources mounted on the LED light strip;
wherein the LED light strip has a bendable circuit sheet mounted on an inner surface of the glass lamp tube to electrically connect the LED light sources with the power supply, the length of the bendable circuit sheet is larger than the length of the glass lamp tube to form a freely extending end portion at one end of the bendable circuit sheet along a longitudinal direction of the glass lamp tube, the freely extending end portion is electrically connected to the power supply, and the glass lamp tube and the end cap are secured by a hot melt adhesive.
9. The LED tube lamp of claim 8 , further comprising a reflective film disposed on a part of the inner surface of the glass lamp tube which is not formed with the light scattering region.
10. The LED tube lamp of claim 9 , wherein a ratio of a length of the reflective film disposed on the inner surface of the glass lamp tube extending along the circumferential direction of the glass lamp tube to a circumferential length of the lamp tube is about 0.3 to 0.5.
11. The LED tube lamp of claim 8 , wherein the bendable circuit sheet is made of a metal layer structure.
12. The LED tube lamp of claim 11 , wherein the metal layer structure is a patterned wiring layer.
13. The LED tube lamp of claim 8 , wherein the heat shrink sleeve is substantially transparent with respect to the wavelength of light from the LED light sources.
14. An LED tube lamp, comprising:
a glass lamp tube covered by a heat shrink sleeve, wherein the inner surface of the glass lamp tube is formed with a rough surface and the roughness of the inner surface is higher than that of the outer surface and the roughness of the inner surface is from 0.1 to 40 μm, and the glass lamp tube comprises a main body region, a rear end region, and a two-arc-shaped transition region connecting the main body region and the rear end region;
an end cap disposed at one end of the glass lamp tube;
a power supply provided inside the end cap; and
an LED light strip disposed inside the glass lamp tube with a plurality of LED light sources mounted on the LED light strip;
wherein the LED light strip has a bendable circuit sheet mounted on the inner surface of the glass lamp tube to electrically connect the LED light sources with the power supply, the length of the bendable circuit sheet is larger than the length of the glass lamp tube to form a freely extending end portion at one end of the bendable circuit sheet along a longitudinal direction of the glass lamp tube, the freely extending end portion is electrically connected to the power supply, and the glass lamp tube and the end cap are secured by a hot melt adhesive.
15. The LED tube lamp of claim 14 , further comprising a reflective film disposed on a part of the inner surface of the glass lamp tube which is not formed with the rough surface.
16. The LED tube lamp of claim 15 , wherein a ratio of a length of the reflective film disposed on the inner surface of the lamp tube extending along the circumferential direction of the lamp tube to a circumferential length of the lamp tube is about 0.3 to 0.5.
17. The LED tube lamp of claim 14 , wherein the bendable circuit sheet is made of a metal layer structure.
18. The LED tube lamp of claim 17 , wherein the metal layer structure is a patterned wiring layer.
19. The LED tube lamp of claim 14 , wherein the glass lamp tube is coated with an anti-reflection layer with a thickness of one quarter of the wavelength range of light coming from the LED light source, and the refractive index of the anti-reflection layer is a square root of the refractive index of the glass lamp tube with a tolerance of ±20%.
20. The LED tube lamp of claim 14 , wherein the heat shrink sleeve is substantially transparent with respect to the wavelength of light from the LED light sources.