Patent ID: 11936829
Assignee: RICOH COMPANY, LTD.
Field: Audio-visual technology (Electrical engineering)
Classification: CPC H  F | IPC F  H

Claim 4:
5. The illuminating device according to claim 1, wherein
the second light source is between a pair of the plurality of first light sources in a longer-side direction of the circuit board, and
based on the illuminating device being viewed from a light-source mount surface of the circuit board in a vertical direction,
B≤X / tan θ is satisfied, wherein
B is a distance between the second light emitting surface of the second light source and neighboring one of the plurality of first light emitting surfaces of the plurality of first light sources in the longer-side direction,
θ is a half-value angle of the second light source, and
X is a distance between a center of light emission of the second light source and an edge of the neighboring one of the plurality of first light emitting surfaces of the plurality of first light sources on a side of the second light source.