Light source device

1. A light source device, comprising:

a plurality of light-emitting diodes arranged on a plane,

wherein a viewing angle of each of the plurality of light-emitting diodes is less than 50° or more than 80° , wherein

the plurality of light-emitting diodes are arranged circularly around a center point of the plane, wherein

the plurality of light-emitting diodes are arranged at equal intervals in a circumferential direction and a radial direction about a central axis perpendicular to the plane, and wherein

at a position where a light intensity becomes 60% of a peak value on an irradiated plane that is parallel to the plane, a value obtained by dividing a distance along the irradiated plane from the central axis to the position by a distance from the center point of the plane to a light-emitting diode of the plurality of light-emitting diodes that is farthest from the center point of the plane is not less than −0.9 and not more than 0.9.

2. The light source device according to claim 1 , wherein the viewing angle of each of the plurality of light-emitting diodes is less than 50° , and wherein an optical distance along a direction perpendicular to the plane, from each of the plurality of light-emitting diodes to the irradiated plane parallel to the plane which is irradiated with light from each of the plurality of light-emitting diodes, is not more than 200 mm.

3. The light source device according to claim 1 , wherein the viewing angle of each of the plurality of light-emitting diodes is less than 50° , and wherein a pitch of the arrangement of the plurality of light-emitting diodes in the radial direction is not less than 8.5 mm and less than 20 mm.

4. The light source device according to claim 1 , wherein the viewing angle of each of the plurality of light-emitting diodes is more than 80° , and wherein an optical distance along a direction perpendicular to the plane, from each of the plurality of light-emitting diodes to the irradiated plane parallel to the plane which is irradiated with light from each of the plurality of light-emitting diodes, is not less than 80 mm.

5. The light source device according to claim 1 , wherein the viewing angle of each of the plurality of light-emitting diodes is more than 80° , and wherein a pitch of the arrangement of the plurality of light-emitting diodes in the radial direction is not less than 8.5 mm and not more than 20 mm.

6. The light source device according to claim 1 , wherein a second distance from the central axis to a position along the irradiated plane where light intensity becomes 80% of peak value is not less than 44 mm.

7. The light source device according to claim 1 , wherein, in a state that the viewing angle is less than 50° , the distance from the central axis to the position along the irradiated plane where light intensity becomes 60% of peak value is not less than 58 mm.

8. The light source device according to claim 1 , wherein, in a state that the viewing angle is more than 80° , the distance from the central axis to the position along the irradiated plane where light intensity becomes 60% of peak value is not less than 60 mm.

9. The light source device according to claim 1 , wherein a center light-emitting diode of the plurality of light-emitting diodes is positioned at the center point of the plane.