Abstract: A light irradiation device includes a heat sink provided with a heat pipe, an LED substrate disposed to be in contact with the heat sink, and an enclosure that houses the heat sink and the LED substrate. The LED substrate has a light-emitting area in which a plurality of LED elements is arranged. When viewed from a direction orthogonal to a main surface of the LED substrate, part of the heat pipe is located inside the light-emitting area and another part of the heat pipe is located outside the light-emitting area.

Abstract: A high pressure discharge lamp includes a light emission section in which a pair of electrodes is arranged, sealing portions formed from both ends of the light emission section, external leads, and a trigger wire provided near the light emission section. The trigger wire includes a first coil portion, which is wound from a vicinity of a boundary between the light emission section and one of the sealing portions towards an outer end of the one of sealing portions, and a linear stretch-across portion, which extends from the first coil portion near the light emission section towards the external lead extending from an outer end of the other sealing portion and is fixed to the external lead. A second coil portion is formed around the other sealing portion. The wire, which forms the stretch-across portion, is held between the second coil portion and the other sealing portion.

Abstract: A high pressure discharge lamp includes a light emission section in which a pair of electrodes is arranged, sealing portions formed from both ends of the light emission section, external leads, and a trigger wire provided near the light emission section. The trigger wire includes a first coil portion, which is wound from a vicinity of a boundary between the light emission section and one of the sealing portions towards an outer end of the one of sealing portions, and a linear stretch-across portion, which extends from the first coil portion near the light emission section towards the external lead extending from an outer end of the other sealing portion and is fixed to the external lead. A second coil portion is formed around the other sealing portion. The wire, which forms the stretch-across portion, is held between the second coil portion and the other sealing portion.