Patent ID: 11268675

Abstract:
When viewed in parallel to a central axis (C1), three LED substrates (4) form an equilateral triangle (T) that surrounds the central axis (C1) and are disposed equidistantly with respect to the central axis (C1). When viewed in parallel to the central axis (C1), LEDs (8) are disposed on an outer surface (4a) of each LED substrate (4) at least one each at each of a pair of placement positions (Q1) at both sides sandwiching a reference normal (BN) being a normal to the outer surface (4a) and passing through the central axis (C1). The LEDs (8) each have an optical axis (8a) orthogonal to the outer surface (4a). When viewed in parallel to the central axis (C1), radiated lights from the LEDs (8) at the pair of placement positions (Q1) of each LED substrate (4) are, by an optical system (K), converted to and emitted as emitted parallel lights (RPL) that are respectively parallel to a pair of light emission reference lines (RB) passing through the central axis (C1) at both sides sandwiching the reference normal (BN) and respectively contain the corresponding light emission reference lines (RB).