Spotlight and converging lens

1. A spotlight, comprising:

a light-emitting device; and

a converging lens, disposed beside the light-emitting device, and having a light-emitting surface and a light incidence surface, the light incidence surface located between the light-emitting surface and the light-emitting device, wherein

an outer diameter of the converging lens is progressively decreased from the light-emitting surface toward the light incidence surface,

the light-emitting surface has an opening, a maximum distance between the light incidence surface and the light-emitting surface along a thickness direction of the converging lens is H1, a maximum distance between a bottom surface of the opening and the light incidence surface along the thickness direction is H2, and 0.3×H1≤H2≤0.5×H1,

the light incidence surface has at least one annular groove, wherein the at least one annular groove and the light-emitting device have a same central axis.

2. The spotlight as claimed in claim 1 , wherein a minimum distance between the light incidence surface and the light-emitting device along the thickness direction is smaller than or equal to 1 mm.

3. The spotlight as claimed in claim 1 , wherein an outer diameter of the light-emitting surface is D1, a diameter of a light-emitting region of the light-emitting device is L1, and D1:H1:L1=3.5:2:1.

4. The spotlight as claimed in claim 3 , wherein an inner diameter of the bottom surface of the opening is D2, and D2>L1.

5. The spotlight as claimed in claim 3 , wherein an amount of the at least one annular groove is one, a minimum distance between a bottom of the annular groove and the central axis is L2, and 0.2×L1≤L2≤0.3×L1.

6. The spotlight as claimed in claim 1 , wherein a maximum depth of the at least one annular groove is H3, and 0.05×H2≤H3≤0.5×H2.

7. The spotlight as claimed in claim 1 , wherein an amount of the at least one annular groove is plural, an included angle between the central axis and a section line of at least one side surface of at least one of the annular grooves on a reference plane parallel to the thickness direction is α, and 0°≤α≤20°.

8. The spotlight as claimed in claim 1 , wherein the converting lens further has an outer surface connected to the light-emitting surface and the light incidence surface, the outer surface comprises a first surface and a second surface, the first surface is connected to the light-emitting surface and the second surface, the second surface is connected to the first surface and the light incidence surface, the first surface and the second surface have a first intersection, a maximum distance between the first intersection and the light incidence surface along the thickness direction is H4, and H4≤H2.

9. The spotlight as claimed in claim 8 , wherein a section line of the first surface on a reference plane parallel to the thickness direction is an oblique line or an arc line, an included angle between the central axis and a tangent line of the section line is θ1, and 30°<θ1<40°.

10. The spotlight as claimed in claim 1 , wherein the opening has a first side surface connected to the bottom surface, an included angle between the central axis and a section line of the first side surface on a reference plane parallel to the thickness direction is θ2, and 0°≤θ2<10°.

11. The spotlight as claimed in claim 10 , wherein the opening further has a second side surface, the second side surface is connected to the light-emitting surface and the first side surface, an included angle between the central axis and a section line of the second side surface on the reference plane is θ3, and 30°≤θ3≤50°.

12. The spotlight as claimed in claim 11 , wherein the converging lens further has an outer surface connected to the light-emitting surface and the light incidence surface, the outer surface and the light-emitting surface have a second intersection, the light-emitting surface and the second side surface have a third intersection, the second side surface and the first side surface have a fourth intersection, a distance between the second intersection and the fourth intersection along a width direction perpendicular to the thickness direction is L3, a distance between the third intersection and the fourth intersection along the width direction is L4, and 0.3×L3≤L4≤0.45×L3.

13. A converging lens, comprising a light-emitting surface and a light incidence surface, wherein

an outer diameter of the converging lens is progressively decreased from the light-emitting surface toward the light incidence surface,

the light-emitting surface has an opening, a maximum distance between the light incidence surface and the light-emitting surface along a thickness direction of the converging lens is H1, a maximum distance between a bottom surface of the opening and the light incidence surface along the thickness direction is H2, and 0.3×H1≤H2≤0.5×H1,

the light incidence surface has at least one annular groove, and the at least one annular groove has a central axis.

14. The converging lens as claimed in claim 13 , wherein a maximum depth of the at least one annular groove is H3, and 0.05×H2≤H3≤0.5×H2.

15. The converging lens as claimed in claim 13 , wherein an amount of the at least one annular groove is plural, an included angle between the central axis and a section line of at least one side surface of at least one of the annular grooves on a reference plane parallel to the thickness direction is α, and 0°≤α≤20°.

16. The converging lens as claimed in claim 13 , further comprising:

an outer surface, connected to the light-emitting surface and the light incidence surface, and comprising a first surface and a second surface, wherein the first surface is connected to the light-emitting surface and the second surface, the second surface is connected to the first surface and the light incidence surface, the first surface and the second surface have a first intersection, a maximum distance between the first intersection and the light incidence surface along the thickness direction is H4, and H4≤H2.

17. The converging lens as claimed in claim 16 , wherein a section line of the first surface on a reference plane parallel to the thickness direction is an oblique line or an arc line, an included angle between the central axis and a tangent line of the section line is θ1, and 30°<θ1<40°.

18. The converging lens as claimed in claim 13 , wherein the opening has a first side surface connected to the bottom surface, an included angle between the central axis and a section line of the first side surface on a reference plane parallel to the thickness direction is θ2, and 0°≤θ2<10°.

19. The converging lens as claimed in claim 18 , wherein the opening further has a second side surface, the second side surface is connected to the light-emitting surface and the first side surface, an included angle between the central axis and a section line of the second side surface on the reference plane is θ3, and 30°≤θ3≤50°.

20. The converging lens as claimed in claim 19 , further comprising:

an outer surface, connected to the light-emitting surface and the light incidence surface, wherein the outer surface and the light-emitting surface have a second intersection, the light-emitting surface and the second side surface have a third intersection, the second side surface and the first side surface have a fourth intersection, a distance between the second intersection and the fourth intersection along a width direction perpendicular to the thickness direction is L3, a distance between the third intersection and the fourth intersection along the width direction is L4, and 0.3×L3≤L4≤0.45×L3.