Light emitting device

1 . A light emitting device comprising:

a light emitting portion;

a housing having a cylindrical shape with a central axis extending vertically and forming an interior space in which the light emitting portion is accommodated, the housing including an upper wall portion formed with a communication hole that communicates with the interior space, and a peripheral wall portion extending downward from the upper wall portion;

a cover fixed to the housing and covering above the upper wall portion of the housing, the cover forming a humidity control space to control humidity of the interior space between the cover and the upper wall portion of the housing; and

a waterproof and moisture-permeable member arranged in the humidity control space and covering the communication hole,

wherein the cover includes an outer peripheral edge portion extending in a circumferential direction around the central axis and having a size including the upper wall portion of the housing in a plan view, and the outer peripheral edge portion includes a lower end arranged below an upper surface of the upper wall portion of the housing, and

a ventilation hole that opens downward such as to communicate the humidity control space with an outside is formed between the outer peripheral edge portion of the cover and the housing.

2 . The light emitting device according to claim 1 , wherein the upper surface of the upper wall portion of the housing includes an inclined portion which becomes lower as it moves away from the central axis and in which the communication hole is opened.

3 . The light emitting device according to claim 2 , wherein the communication hole is arranged higher than a lowest position of the inclined portion.

4 . The light emitting device according to claim 2 , wherein the waterproof and moisture-permeable member includes a waterproof and moisture-permeable sheet having an upper surface continuing to the inclined portion at an inclination equal to the inclined portion.

5 . The light emitting device according to claim 1 , wherein the cover includes an upwardly convex dome-shaped cover main body and a downward annular flange extending from an outer peripheral edge portion of the cover main body, and

the annular flange constitutes the outer peripheral edge portion of the cover.

6 . The light emitting device according to claim 5 , wherein the cover includes a plurality of fitting claws that project downward from the cover main body, are annularly arranged around the central axis, and form a circumferential gap therebetween, the plurality of fitting claws fitted to an outer peripheral surface of an upper part of the peripheral wall portion of the housing, and

the ventilation hole includes a plurality of ventilation holes, and

the plurality of ventilation holes are formed each including the circumferential gap between the plurality of fitting claws.

7 . The light emitting device according to claim 6 , wherein the housing includes a plurality of ribs projecting from the upper surface of the upper wall portion,

each of the plurality of ribs is arranged between the corresponding circumferential gap and the central axis in a plan view, and

with respect to an angle range in the circumferential direction around the central axis, an angle range in the circumferential direction occupied by each of the plurality of ribs is set to a size including an angle range in the circumferential direction occupied by the corresponding circumferential gap.

8 . The light emitting device according to claim 7 , wherein the plurality of ribs are in contact with an inner upper surface of the cover main body.