To enhance the compatibility for the lighting of two-bulbs-in-series by removing a full wave rectification exclusive circuit, and to ensure flicker-free lighting even without the full wave rectification exclusive circuit.
A main terminal M, sub-terminal S, and common terminal C are made to have mounting compatibility with railroad's G-type signal bulbs, and in addition, both the light emitting diodes M1 to M4 of a main-light-emitting section 11, and the light emitting diodes S1 to S4 of a sub-light-emitting section 12 are divided into forward half wave rectification sections M3 to M4, and S3 to S4 that are lighted by passing current directed from the terminals M, S to the common terminal C while half-rectifying supplied alternating current, and reverse half wave rectification sections M1 to M2, S1 to S2 that are lighted by passing current directed from the common terminal C to be sent on to terminals M, and S, while half-rectifying the foregoing alternating current, thus only these light emitting diodes M1 to M4 and S1 to S4 perform full wave rectification.
YAMAZAKI YOSHIHIKO
MIZUNO TAKESHI
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