A multitrack optical disc reader is disclosed comprising a multitrack optical pick up for reading data from multiple tracks of an optical disc and outputting the data from each track in respective data streams, and multiple first-in-first-out memories for temporarily storing the data streams. An electrostatic chuck plate is fixed to a support stand by hold-down fittings, whereby a plug in a lower end portion of a copper pipe is fitted into a fitting socket against the pushing-up force of a jump-up fitting relying on a compression spring member. The semiconductor layer comprises a second semiconductor material with a second natural lattice constant. The search range is capable of being rotated, and is part of a novel correlation technique of the present invention that provides a more robust estimate of pixel match reliability. The length of need section may include portions of each of the respective cables running in between the plurality of intermediate support posts. The vehicular lamp that is used for a vehicle includes a semiconductor light-emitting element, and a current controlling unit operable to increase an electric current flowing into the semiconductor light-emitting element according to a signal output from a sensor depending on a brightness of the circumference of the vehicle when the circumference of the vehicle is bright.