Patent ID: 7009195

Claim:
A photoconductive switch module comprising: a first substrate having light-emitting elements; a second substrate having photoconductive switch elements, whose number is equal to that of the light-emitting elements, the light-emitting elements and the photoconductive switch elements being arranged to face each other, the photoconductive switch elements being turned on/off in accordance with lighting/extinction of the light-emitting elements; and a third substrate arranged between the first substrate and the second substrate, the third substrate having through holes, whose number is equal to that of the light-emitting elements, each through hole being arranged between the light-emitting element and the photoconductive switch element facing each other, drive light emitted from each light-emitting element traveling to the photoconductive switch element via the through hole; wherein the second substrate has a circuit wiring connected to the photoconductive switch elements on the side facing the third substrate, the third substrate has a concave portion extending along the circuit wiring, such that the through holes terminate on the bottom surface of the concave portion, and the third substrate has conductivity at least in the vicinity of the surface of the concave portion and the circuit wiring and the concave portion are arranged to face each other.